US20080273821A1 - Method and Apparatus for Laser Scored Packaging - Google Patents
Method and Apparatus for Laser Scored Packaging Download PDFInfo
- Publication number
- US20080273821A1 US20080273821A1 US11/969,680 US96968008A US2008273821A1 US 20080273821 A1 US20080273821 A1 US 20080273821A1 US 96968008 A US96968008 A US 96968008A US 2008273821 A1 US2008273821 A1 US 2008273821A1
- Authority
- US
- United States
- Prior art keywords
- package
- web material
- seal
- ablation pattern
- side edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/32—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture
- B65D81/3261—Flexible containers having several compartments
- B65D81/3272—Flexible containers having several compartments formed by arranging one flexible container within another
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
- B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
- B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/2014—Tube advancing means
- B65B9/2028—Rollers or belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B2220/00—Specific aspects of the packaging operation
- B65B2220/08—Creating fin seals as the longitudinal seal on horizontal or vertical form fill seal [FFS] machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B2230/00—Aspects of the final package
- B65B2230/02—Containers having separate compartments isolated from one another
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B29/00—Packaging of materials presenting special problems
- B65B29/10—Packaging two or more different substances isolated from one another in the package but capable of being mixed without opening the package, e.g. forming packages containing a resin and hardener isolated by a frangible partition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/2056—Machines for packages of special type or form
Definitions
- This invention relates generally to packaging and more particularly to easy-open foodstuff packaging.
- packages such as stick-pack packages
- the package should be sealed to protect the contents from the outside moisture but also be easily opened by a consumer.
- Such packages are typically made in a vertical-form-fill-and-seal process wherein a web of material is folded over and sealed. This sealed material is cut and sealed on one end and then filled with the package contents. The second end is then also cut and sealed, thereby sealing the contents of the package therein. To open the package, a user must either pull apart the seal or otherwise cut or tear the package.
- the side of the package is cut to provide the consumer with a starting point in tearing open the package.
- This approach requires that the package be sealed around the cut portion which takes additional manufacturing resources and efforts.
- the side edge of the package is flawed by a physical micro-abrasion process that weakens the side of the package such that the package tears more easily on the edge when a user applies a tearing force to open the package.
- the package will merely tear along weak areas naturally present in the package material such that the tear may not propagate straight across the package.
- the tear typically stops at the seal running the length of the package without undue additional force applied by the user.
- Another known method for assisting the opening of a package includes weakening the package material along a given line such that a tear will likely propagate along that line when opening the package.
- One such method includes ablating the package material with a laser. The laser damages the package material along a line across the material without cutting entirely through the package material. Thus, when a user tears at the package, the package is more likely to tear along the laser-damaged portion.
- a package is scored by a laser all the way across the package, however, the package is too often so weakened that it cannot stay intact during its manufacturing process or during normal handling by a user before the package is intended to be opened.
- Having the increased amount of non-scored portions relative to the scored portions provides increased material strength for such load carrying bags, but for smaller foodstuff packaging, such a ratio of laser scoring typically will not satisfactorily carry a tear line cleanly and consistently straight across a package or ensure that laser scoring will be present on the package and seal edges to provide an increased ease of starting a tear and propagating a tear across a package seal.
- FIG. 1 comprises a plan view of a web material for use in creating a package as configured in accordance with various embodiments of the invention
- FIG. 2 comprises a bottom plan view of package as configured in accordance with various embodiments of the invention
- FIG. 3 comprises a top plan view of a portion of a package as configured in accordance with various embodiments of the invention
- FIG. 4 comprises a top plan view of the portion of a package of FIG. 3 while a tearing force is applied by a user to an edge of the package;
- FIG. 5 comprises a side view of a package as configured in accordance with various embodiments of the invention with an end completely removed such that the contents can be fully emptied;
- FIG. 6 comprises a perspective view of a three layer web material as configured in accordance with various embodiments of the invention.
- FIG. 7 comprises an elevation view of a three layer web material along a cross-section along an ablation pattern as configured in accordance with various embodiments of the invention
- FIG. 8 comprises a perspective view of a two layer web material as configured in accordance with various embodiments of the invention.
- FIG. 9 comprises an elevation view of a two layer web material along a cross-section along an ablation pattern as configured in accordance with various embodiments of the invention.
- FIG. 10 comprises a perspective view of a web material to be formed into a package having a fin-type seal as configured in accordance with various embodiments of the invention
- FIG. 11 comprises a perspective view of a package having a fin-type seal as configured in accordance with various embodiments of the invention.
- FIG. 12 comprises a perspective view of a web material to be formed into a package having an overlap seal as configured in accordance with various embodiments of the invention
- FIG. 13 comprises a perspective view of a package having an overlap seal as configured in accordance with various embodiments of the invention.
- FIG. 14 comprises a perspective view of a package having two web materials as configured in accordance with various embodiments of the invention.
- FIG. 15 comprises a cross-sectional view along line Z-Z of the package of FIG. 14 ;
- FIG. 16 comprises a perspective view of elements of a vertical-form-fill-and-seal device.
- a package formed via a vertical-form-fill-and-seal process includes a web material with edge portions sealed to create a vertical sleeve.
- the web material also includes a first sealed end and a second sealed end at either end of the vertical sleeve to create a sealed package.
- the package includes a laser scribed ablation pattern extending across the web material with ablated portions having an about one millimeter to about three millimeters length separated by non-ablated portions of about 0.25 millimeter to about 0.75 millimeter length.
- the package typically has a vertical length of about 75 millimeters to about 200 millimeters.
- the package provides a sealed container that a user may open along the package's ablation pattern.
- the package may contain foodstuffs such as drink powders, dessert powders, snack nuts, condiments, and toppings that are poured into another container or directly into a consumer's mouth.
- the laser ablation pattern having a dash score length of about one millimeter to about three millimeters and a space between scores of about 0.25 millimeters to about 0.75 millimeters, provides the web material with increased tensile strength so as to avoid breaking during the conventional vertical-form-fill-and-seal process, but also provides a high likelihood that an outer edge of the package includes an ablated portion to provide a user an easy-to-start tear area to open the package.
- this pattern provides a high likelihood that an edge of the vertical seal has an ablated portion such that the tearing of the package more easily propagates across the seal. Also, the short spaces between the ablated portions increase the likelihood that the tear will propagate in a line along the ablation pattern, all the way across the package, so that the end of the package is relatively easily and completely removed to allow unrestricted access to the package's contents.
- a longer dash or continuous line for the ablation pattern will excessively weaken the web material, and a shorter dash will make the web material more difficult to open.
- a longer space between ablated portions will likely allow the tear to move away from the score line, and a shorter space between ablated portions will reduce the tensile strength to mimic a solid score.
- a dash pattern in accordance with the teachings of this disclosure provides a preferred combination of features for such packages.
- a package 10 formed via a vertical-form-fill-and-seal process includes a web material 12 with a first edge portion 14 and a second edge portion 16 opposite the first edge portion 14 that are sealed together in a seal 18 .
- the package 10 includes a first sealed end 20 at a first end 22 of the seal 16 and a second sealed end 24 at a second end of the seal 16 .
- Any of the above described seals may be made by conventional methods, including, for example, the application of heat and pressure to create a laminate seal. With these seals, the contents of the package 10 are protected from outside elements such as moisture and/or oxygen that may affect the quality of the contents.
- the first sealed end 20 and the second sealed end 24 define a first package side edge 28 and a second package side edge 30 wherein the first package side edge 28 and the second package side edge 30 are folded web material created by and between the edges of the sealed ends 20 and 24 .
- the folded web material may be creased along fold lines 15 and 17 to better define the side edges for the user or may be rounded portions of the web material transitioning from the front of the package 10 to the back.
- the package 10 also includes an ablation pattern 32 extending across the web material 12 between the first edge portion 14 and the second edge portion 16 .
- the ablation pattern 32 includes a series of ablated portions 34 about one to about three millimeters in length (designated, for example, by line 35 in FIG. 6 ) separated by non-ablated portions 36 about 0.25 to about 0.75 millimeters in length (designated, for example, by line 37 in FIG. 6 ) such that the ablation pattern defines a tear line 39 across the package 10 .
- the package 10 substantially tears along the along tear line 39 and across the seal 18 without varying from the tear line 39 when a separating force is applied by a user at the first package side edge 28 or the second package side edge 30 as shown in FIGS. 3 and 4 .
- the range of ablation portion lengths and non-ablated portion lengths taught herein also increases the likelihood that the first package side edge 28 , the second package side edge 30 , and an edge 29 of the seal 18 have ablated portions 34 , thereby improving the ease at which the package 10 begins tearing and continues tearing through the seal 18 without a substantial increase in tearing force applied by the user. So configured, the user may more easily remove the entire package end to release the package contents 11 as illustrated in FIG. 5 .
- the web material 12 maintains sufficient tensile strength via the non-ablated portions 36 to withstand the vertical-form-fill-and-seal process substantially without breaking.
- the web material 12 may include one or more layers of material, although typically the web material 12 includes at least two layers.
- a multi-layer web material 12 includes at least an outer layer 40 comprising at least one of a group including PET (polyethylene terephthalate) and OPP (oriented polypropylene film).
- the outer layer 40 will typically include branding and product information.
- a second layer 42 includes at least one of a group comprising PET, OPP, and foil, typically including sealant for a two layer structure.
- An optional third layer 44 may operate as a sealant layer typically comprising primarily PE (polyethylene) or other material suitable for contacting the package's contents 11 and providing adequate seal characteristics as generally known in the art with the second layer acting as a barrier. Any one or more of the layers may also be metalized to increase the protection of the package's contents 11 .
- PE polyethylene
- the ablated portions 34 are scribed with carbon dioxide lasers during the manufacturing of the web material 12 and prior to the vertical-form-fill-and-seal manufacturing process, although the ablated portions 34 may be scribed during the vertical-form-fill-and-seal process. Other types of lasers may be used to create the ablated portions 34 .
- the ablated portions 34 have a depth less than a thickness of an outer layer 40 of the package 10 . This depth maintains the integrity of the package seal and strength of the web material 12 .
- the ablation pattern 32 is generally shown herein as a uniform pattern, the ablation pattern 32 may have a non-uniform pattern 50 within the length ranges for the ablated and non-ablated portions as taught herein.
- a second ablation pattern 48 may be disposed on a web material side 46 opposite and substantially in line with the first ablation pattern 32 .
- various approaches to the laser scoring placement are possible, including, for example, a single ablation pattern on an outer portion of the package 10 , a single ablation pattern on an inner portion of the package 10 , single ablation patterns substantially in line with each other on the outside and inside portions of the package 10 , double ablation patterns on the inside and/or outside portions of the package, and so forth.
- the seal 18 of the first edge portion 14 to the second edge portion 16 of the web material 12 may include any type of seal known in the art but will typically comprise a fin-type seal 52 or an overlap seal 62 . Such seals are known in the art, but will be described briefly for clarity. With reference to FIGS. 10 and 11 , a fin-type seal 52 is formed by folding the web material 12 such that the inner portions 46 of the first edge portion 14 and second edge portion 16 touch.
- edge portions are sealed together and folded against the package 10 , thereby creating a “fin.”
- the ablation pattern 32 extends across the whole web material 12 , the ablation pattern 32 creates a line of weakness across the fin-type seal 52 thereby rending the seal more easily torn.
- an ablated portion 34 is more likely positioned on an edge 29 of the fin-type seal 52 to help the propagation of the tear to continue across the seal 52 .
- an overlap seal 62 is formed by folding the web material 12 such that one of either the first edge portion 14 and second edge portion 16 overlaps the other.
- FIG. 12 shows the first edge portion 14 overlapping with the second edge portion 16 .
- These edge portions are then sealed together, eliminating a need for a folded portion like the fin-type seal 52 .
- the ablation pattern 32 extends across the whole web material 12 , the ablation pattern 32 creates a line of weakness across the overlap seal 62 thereby rending the seal more easily torn.
- an ablated portion 34 is more likely positioned on an edge 29 of the fin-type seal 62 to help the propagation of the tear to continue across the seal 62 .
- a package 100 may include two web materials 102 and 104 sealed together to define an interior space 105 .
- the first web material 102 is sealed to the second web material 104 at a first side edge 114 along a first side edge seal 128 and at a second side edge 116 along a second side edge seal 130 .
- the package 100 also includes a first sealed end 120 and a second sealed end 124 sealing the package 100 between the first side edge seal 128 and the second side edge seal 130 .
- An ablation pattern 32 as described above extends across at least the first web material 102 between the first side edge 114 and the second side edge 116 such that the ablation pattern 32 defines a tear line 39 across the package 100 .
- the first side edge seal 114 and the second side edge seal 116 have a high likelihood of having ablated portions 34 , the package 100 substantially tears along the along tear line 39 and across the first side edge seal 128 and the second side edge seal 130 when a separating force is applied by a user at the first side edge 114 or the second side edge 116 .
- the web materials 102 and 104 also maintain sufficient tensile strength to withstand the vertical-form-fill-and-seal process substantially without breaking.
- the method includes laser scoring an ablation pattern 32 across a web material 12 between a first edge portion 14 and a second edge portion 16 of the web material 12 and (as generally indicated by reference number 210 ) feeding the web material 12 into a vertical-form-fill-and-seal-process device 200 .
- the ablation pattern 32 was laser scored during the manufacture of the web material 12 and prior to its feeding into the vertical-form-fill-and-seal-process device 200 .
- lasers may be incorporated into the vertical-form-fill-and-seal-process device 200 such that the ablation pattern 32 may be added after feeding the web material 12 into the vertical-form-fill-and-seal-process device 200 .
- the laser scoring may ablate the web material 12 on two sides of the web material 12 and substantially in line with the ablation patterns on either side of the material.
- the web material 12 is then sealed along a vertical direction to form at least one seal 18 , and advanced within the vertical-form-fill-and-seal-process device 200 .
- the web material 12 is sealed and cut horizontally across the at least one seal 18 at a first end 22 of the package 10 .
- the web material 12 is then cut at a second end 26 of the package 10 with the ablation pattern 32 between the first end 22 and the second end 26 .
- the second cut severs the web material 12 such that the length from the first end 22 to the second end 26 is about 75 millimeters to about 200 millimeters.
- the vertical-form-fill-and-seal-process device 200 depicted in FIG. 16 is designed to create a fin-type seal
- the above described method can be applied to any of the other package seals described herein, including, for example, an overlap seal package and a dual web material package.
- the step of sealing the web material along the vertical direction to form a seal may include sealing the web material 12 to a second web material.
- two vertical seals at the vertical edges of the web materials may be created at this step.
- the second web material may be laser scored with a second ablation pattern.
- Other variations of the laser scoring pattern and sealing process will be recognized by those skilled in the art.
- the package created by such a method and as described herein provides relative ease of starting to open the package when compared to previous methods provided to consumers to help open relatively small web-based packaging. Moreover, the tear more reliably propagates along the tear line and more easily propagates past vertical seals in the packaging.
- a test was conducted to compare the tear forces needed to be applied over time while propagating a tear through a typical fin-type seal package. The test was conducted as follows. A package with a laser score pattern was fit with taped extensions to mimic the rolling wrist action of a user. The portion of the package below the score line was fixed securely in the test device, while the extension tape affixed to the portion above the score line was secured in the tear tester jaws. The testing device was a Vinatoru seal strength tester. The tester jaws pulled the tape from the opposite side of the package and progressed across the top of the package and upward at a 30 degree angle. The tester jaws were fitted with a force transducer and the instantaneous force was recorded at regular intervals.
- FIG. 17 illustrates the results of the test.
- the laser scribed, dashed ablation pattern as described herein (labeled “Dash”) allows for the package to open with approximately the same force, or ease of opening, as having a continuous laser score line (labeled “Continuous”) in the web material.
- Both of the laser scored packages necessitated substantially less opening force than the notched approach (labeled “Notch Edge/Fin”) and the micro-abrasion approach (labeled “Fancy Cut” for the FANCY CUT brand of packaging).
- the dashed ablation pattern has a consistently improved tensile strength over packages having a continuous score line.
- the data presented in FIG. 18 was collected by measuring the tensile strength of packages using an Instron testing device. The data demonstrates that the ablation pattern has sufficiently improved tensile strength over a continuous score line so as to be less likely to break in a vertical-form-fill-and-seal process while having approximately the same opening force, as shown in FIG. 17 .
Abstract
Description
- This application is a continuation-in-part of co-pending and co-owned U.S. patent application Ser. No. 11/742,754, entitled Ingredient Package and Method and filed May 1, 2007, which is incorporated by reference in its entirety herein.
- This invention relates generally to packaging and more particularly to easy-open foodstuff packaging.
- Various packaging methods and types are known in the art. Considerations for commercial packaging include protection of the package's contents and usability of the package by a consumer or user of the package's contents. In the case of packaged food items, for example, the items generally are sealed into a package to optimize shelf life. When a consumer purchases the product, the consumer must then open the package to access the items stored therein. Accessing the items through a sealed package, however, can require sometimes excessive effort to open the package.
- In certain packages, such as stick-pack packages, it is also advantageous to easily, completely remove an end of the package to allow the contents to be fully poured out. For example, where the contents of a package are intended to be poured into a solution for mixing, such as in a flavored drink product, the package should be sealed to protect the contents from the outside moisture but also be easily opened by a consumer. Such packages are typically made in a vertical-form-fill-and-seal process wherein a web of material is folded over and sealed. This sealed material is cut and sealed on one end and then filled with the package contents. The second end is then also cut and sealed, thereby sealing the contents of the package therein. To open the package, a user must either pull apart the seal or otherwise cut or tear the package.
- Various features have been added to such packages to assist the consumer in opening the package. By one approach, the side of the package is cut to provide the consumer with a starting point in tearing open the package. This approach, however, requires that the package be sealed around the cut portion which takes additional manufacturing resources and efforts. By another known approach, the side edge of the package is flawed by a physical micro-abrasion process that weakens the side of the package such that the package tears more easily on the edge when a user applies a tearing force to open the package. Under this approach and the above cutting approach, however, the package will merely tear along weak areas naturally present in the package material such that the tear may not propagate straight across the package. Moreover, the tear typically stops at the seal running the length of the package without undue additional force applied by the user.
- Another known method for assisting the opening of a package includes weakening the package material along a given line such that a tear will likely propagate along that line when opening the package. One such method includes ablating the package material with a laser. The laser damages the package material along a line across the material without cutting entirely through the package material. Thus, when a user tears at the package, the package is more likely to tear along the laser-damaged portion. When a package is scored by a laser all the way across the package, however, the package is too often so weakened that it cannot stay intact during its manufacturing process or during normal handling by a user before the package is intended to be opened.
- It is known to laser score a pattern into a package material to provide additional strength for a load carrying package, such as a bag of soil or similar relatively heavy material. Previous disclosures teach a ratio of the length of laser scored to non-scored material along a tear line for such an application to be about one to two; in other words, the laser will score a line of about one half the length of intermediate non-scored material between each scored portion. Having the increased amount of non-scored portions relative to the scored portions provides increased material strength for such load carrying bags, but for smaller foodstuff packaging, such a ratio of laser scoring typically will not satisfactorily carry a tear line cleanly and consistently straight across a package or ensure that laser scoring will be present on the package and seal edges to provide an increased ease of starting a tear and propagating a tear across a package seal.
- The above needs are at least partially met through provision of the method and apparatus for laser scored packaging described in the following detailed description, particularly when studied in conjunction with the drawings, wherein:
-
FIG. 1 comprises a plan view of a web material for use in creating a package as configured in accordance with various embodiments of the invention; -
FIG. 2 comprises a bottom plan view of package as configured in accordance with various embodiments of the invention; -
FIG. 3 comprises a top plan view of a portion of a package as configured in accordance with various embodiments of the invention; -
FIG. 4 comprises a top plan view of the portion of a package ofFIG. 3 while a tearing force is applied by a user to an edge of the package; -
FIG. 5 comprises a side view of a package as configured in accordance with various embodiments of the invention with an end completely removed such that the contents can be fully emptied; -
FIG. 6 comprises a perspective view of a three layer web material as configured in accordance with various embodiments of the invention; -
FIG. 7 comprises an elevation view of a three layer web material along a cross-section along an ablation pattern as configured in accordance with various embodiments of the invention; -
FIG. 8 comprises a perspective view of a two layer web material as configured in accordance with various embodiments of the invention; -
FIG. 9 comprises an elevation view of a two layer web material along a cross-section along an ablation pattern as configured in accordance with various embodiments of the invention; -
FIG. 10 comprises a perspective view of a web material to be formed into a package having a fin-type seal as configured in accordance with various embodiments of the invention; -
FIG. 11 comprises a perspective view of a package having a fin-type seal as configured in accordance with various embodiments of the invention; -
FIG. 12 comprises a perspective view of a web material to be formed into a package having an overlap seal as configured in accordance with various embodiments of the invention; -
FIG. 13 comprises a perspective view of a package having an overlap seal as configured in accordance with various embodiments of the invention; -
FIG. 14 comprises a perspective view of a package having two web materials as configured in accordance with various embodiments of the invention; -
FIG. 15 comprises a cross-sectional view along line Z-Z of the package ofFIG. 14 ; -
FIG. 16 comprises a perspective view of elements of a vertical-form-fill-and-seal device. - Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments of the present invention. It will further be appreciated that certain actions and/or steps may be described or depicted in a particular order of occurrence while those skilled in the art will understand that such specificity with respect to sequence is not actually required. It will also be understood that the terms and expressions used herein have the ordinary technical meaning as is accorded to such terms and expressions by persons skilled in the technical field as set forth above except where different specific meanings have otherwise been set forth herein.
- Generally speaking, pursuant to these various embodiments, a package formed via a vertical-form-fill-and-seal process includes a web material with edge portions sealed to create a vertical sleeve. The web material also includes a first sealed end and a second sealed end at either end of the vertical sleeve to create a sealed package. The package includes a laser scribed ablation pattern extending across the web material with ablated portions having an about one millimeter to about three millimeters length separated by non-ablated portions of about 0.25 millimeter to about 0.75 millimeter length. The package typically has a vertical length of about 75 millimeters to about 200 millimeters.
- So configured, the package provides a sealed container that a user may open along the package's ablation pattern. The package may contain foodstuffs such as drink powders, dessert powders, snack nuts, condiments, and toppings that are poured into another container or directly into a consumer's mouth. The laser ablation pattern, having a dash score length of about one millimeter to about three millimeters and a space between scores of about 0.25 millimeters to about 0.75 millimeters, provides the web material with increased tensile strength so as to avoid breaking during the conventional vertical-form-fill-and-seal process, but also provides a high likelihood that an outer edge of the package includes an ablated portion to provide a user an easy-to-start tear area to open the package. Similarly, this pattern provides a high likelihood that an edge of the vertical seal has an ablated portion such that the tearing of the package more easily propagates across the seal. Also, the short spaces between the ablated portions increase the likelihood that the tear will propagate in a line along the ablation pattern, all the way across the package, so that the end of the package is relatively easily and completely removed to allow unrestricted access to the package's contents.
- In other words, a longer dash or continuous line for the ablation pattern will excessively weaken the web material, and a shorter dash will make the web material more difficult to open. A longer space between ablated portions will likely allow the tear to move away from the score line, and a shorter space between ablated portions will reduce the tensile strength to mimic a solid score. As such, a dash pattern in accordance with the teachings of this disclosure provides a preferred combination of features for such packages.
- These and other benefits may become clearer upon making a thorough review and study of the following detailed description. Referring now to the drawings, and in particular to
FIGS. 1 and 2 , an example package that is compatible with many of these teachings will now be presented. Apackage 10 formed via a vertical-form-fill-and-seal process includes aweb material 12 with afirst edge portion 14 and asecond edge portion 16 opposite thefirst edge portion 14 that are sealed together in aseal 18. Thepackage 10 includes a first sealedend 20 at afirst end 22 of theseal 16 and a second sealedend 24 at a second end of theseal 16. Any of the above described seals may be made by conventional methods, including, for example, the application of heat and pressure to create a laminate seal. With these seals, the contents of thepackage 10 are protected from outside elements such as moisture and/or oxygen that may affect the quality of the contents. - The first sealed
end 20 and the second sealedend 24 define a firstpackage side edge 28 and a secondpackage side edge 30 wherein the firstpackage side edge 28 and the secondpackage side edge 30 are folded web material created by and between the edges of the sealed ends 20 and 24. The folded web material may be creased alongfold lines package 10 to the back. - With continuing reference to
FIGS. 1 , 2, and 3, thepackage 10 also includes anablation pattern 32 extending across theweb material 12 between thefirst edge portion 14 and thesecond edge portion 16. Theablation pattern 32 includes a series ofablated portions 34 about one to about three millimeters in length (designated, for example, byline 35 inFIG. 6 ) separated bynon-ablated portions 36 about 0.25 to about 0.75 millimeters in length (designated, for example, byline 37 inFIG. 6 ) such that the ablation pattern defines a tear line 39 across thepackage 10. - With such an ablation pattern, the
package 10 substantially tears along the along tear line 39 and across theseal 18 without varying from the tear line 39 when a separating force is applied by a user at the firstpackage side edge 28 or the secondpackage side edge 30 as shown inFIGS. 3 and 4 . The range of ablation portion lengths and non-ablated portion lengths taught herein also increases the likelihood that the firstpackage side edge 28, the secondpackage side edge 30, and anedge 29 of theseal 18 have ablatedportions 34, thereby improving the ease at which thepackage 10 begins tearing and continues tearing through theseal 18 without a substantial increase in tearing force applied by the user. So configured, the user may more easily remove the entire package end to release thepackage contents 11 as illustrated inFIG. 5 . Moreover, theweb material 12 maintains sufficient tensile strength via thenon-ablated portions 36 to withstand the vertical-form-fill-and-seal process substantially without breaking. - With reference to
FIGS. 6 through 9 , theweb material 12 andablation patterns 32 are further discussed. Theweb material 12 may include one or more layers of material, although typically theweb material 12 includes at least two layers. Amulti-layer web material 12 includes at least anouter layer 40 comprising at least one of a group including PET (polyethylene terephthalate) and OPP (oriented polypropylene film). Theouter layer 40 will typically include branding and product information. Asecond layer 42 includes at least one of a group comprising PET, OPP, and foil, typically including sealant for a two layer structure. An optionalthird layer 44 may operate as a sealant layer typically comprising primarily PE (polyethylene) or other material suitable for contacting the package'scontents 11 and providing adequate seal characteristics as generally known in the art with the second layer acting as a barrier. Any one or more of the layers may also be metalized to increase the protection of the package'scontents 11. - Typically, the
ablated portions 34 are scribed with carbon dioxide lasers during the manufacturing of theweb material 12 and prior to the vertical-form-fill-and-seal manufacturing process, although theablated portions 34 may be scribed during the vertical-form-fill-and-seal process. Other types of lasers may be used to create theablated portions 34. - In a typical approach for the laser scribing, as shown in
FIGS. 7 and 9 , theablated portions 34 have a depth less than a thickness of anouter layer 40 of thepackage 10. This depth maintains the integrity of the package seal and strength of theweb material 12. Although theablation pattern 32 is generally shown herein as a uniform pattern, theablation pattern 32 may have anon-uniform pattern 50 within the length ranges for the ablated and non-ablated portions as taught herein. - By another approach, a
second ablation pattern 48 may be disposed on aweb material side 46 opposite and substantially in line with thefirst ablation pattern 32. Additionally, various approaches to the laser scoring placement are possible, including, for example, a single ablation pattern on an outer portion of thepackage 10, a single ablation pattern on an inner portion of thepackage 10, single ablation patterns substantially in line with each other on the outside and inside portions of thepackage 10, double ablation patterns on the inside and/or outside portions of the package, and so forth. - Referring now to
FIGS. 10 through 13 , theseal 18 of thefirst edge portion 14 to thesecond edge portion 16 of theweb material 12 may include any type of seal known in the art but will typically comprise a fin-type seal 52 or anoverlap seal 62. Such seals are known in the art, but will be described briefly for clarity. With reference toFIGS. 10 and 11 , a fin-type seal 52 is formed by folding theweb material 12 such that theinner portions 46 of thefirst edge portion 14 andsecond edge portion 16 touch. These edge portions are sealed together and folded against thepackage 10, thereby creating a “fin.” When theablation pattern 32 extends across thewhole web material 12, theablation pattern 32 creates a line of weakness across the fin-type seal 52 thereby rending the seal more easily torn. When theablation pattern 32 is configured according to the teachings of this disclosure, anablated portion 34 is more likely positioned on anedge 29 of the fin-type seal 52 to help the propagation of the tear to continue across theseal 52. - With reference to
FIGS. 12 and 13 , anoverlap seal 62 is formed by folding theweb material 12 such that one of either thefirst edge portion 14 andsecond edge portion 16 overlaps the other.FIG. 12 , for example, shows thefirst edge portion 14 overlapping with thesecond edge portion 16. These edge portions are then sealed together, eliminating a need for a folded portion like the fin-type seal 52. When theablation pattern 32 extends across thewhole web material 12, theablation pattern 32 creates a line of weakness across theoverlap seal 62 thereby rending the seal more easily torn. When theablation pattern 32 is configured according to the teachings of this disclosure, anablated portion 34 is more likely positioned on anedge 29 of the fin-type seal 62 to help the propagation of the tear to continue across theseal 62. - By a different approach, and with reference to
FIGS. 14 and 15 , apackage 100 may include twoweb materials interior space 105. By one method, thefirst web material 102 is sealed to thesecond web material 104 at afirst side edge 114 along a firstside edge seal 128 and at asecond side edge 116 along a secondside edge seal 130. Thepackage 100 also includes a firstsealed end 120 and a secondsealed end 124 sealing thepackage 100 between the firstside edge seal 128 and the secondside edge seal 130. Anablation pattern 32 as described above extends across at least thefirst web material 102 between thefirst side edge 114 and thesecond side edge 116 such that theablation pattern 32 defines a tear line 39 across thepackage 100. So configured, the firstside edge seal 114 and the secondside edge seal 116 have a high likelihood of having ablatedportions 34, thepackage 100 substantially tears along the along tear line 39 and across the firstside edge seal 128 and the secondside edge seal 130 when a separating force is applied by a user at thefirst side edge 114 or thesecond side edge 116. Theweb materials - It is possible to have a
second ablation pattern 132 extending across thesecond web material 104 between thefirst side edge 114 and thesecond side edge 116 substantially in line with theablation pattern 32 on thefirst web material 102. Other configurations of ablation patterns are possible and considered within the scope of this disclosure. - With reference to
FIG. 16 , a method for manufacturing apackage 10 according to the teachings of this disclosure will be described. The method includes laser scoring anablation pattern 32 across aweb material 12 between afirst edge portion 14 and asecond edge portion 16 of theweb material 12 and (as generally indicated by reference number 210) feeding theweb material 12 into a vertical-form-fill-and-seal-process device 200. As depicted inFIG. 16 , theablation pattern 32 was laser scored during the manufacture of theweb material 12 and prior to its feeding into the vertical-form-fill-and-seal-process device 200. By another approach, lasers may be incorporated into the vertical-form-fill-and-seal-process device 200 such that theablation pattern 32 may be added after feeding theweb material 12 into the vertical-form-fill-and-seal-process device 200. By yet another approach, the laser scoring may ablate theweb material 12 on two sides of theweb material 12 and substantially in line with the ablation patterns on either side of the material. Theweb material 12 is then sealed along a vertical direction to form at least oneseal 18, and advanced within the vertical-form-fill-and-seal-process device 200. Theweb material 12 is sealed and cut horizontally across the at least oneseal 18 at afirst end 22 of thepackage 10. Theweb material 12 is then cut at asecond end 26 of thepackage 10 with theablation pattern 32 between thefirst end 22 and thesecond end 26. Typically, the second cut severs theweb material 12 such that the length from thefirst end 22 to thesecond end 26 is about 75 millimeters to about 200 millimeters. - Although the vertical-form-fill-and-seal-
process device 200 depicted inFIG. 16 is designed to create a fin-type seal, the above described method can be applied to any of the other package seals described herein, including, for example, an overlap seal package and a dual web material package. For instance, the step of sealing the web material along the vertical direction to form a seal may include sealing theweb material 12 to a second web material. In this example, two vertical seals at the vertical edges of the web materials may be created at this step. Similarly, the second web material may be laser scored with a second ablation pattern. Other variations of the laser scoring pattern and sealing process will be recognized by those skilled in the art. - So configured, the package created by such a method and as described herein provides relative ease of starting to open the package when compared to previous methods provided to consumers to help open relatively small web-based packaging. Moreover, the tear more reliably propagates along the tear line and more easily propagates past vertical seals in the packaging. For example, a test was conducted to compare the tear forces needed to be applied over time while propagating a tear through a typical fin-type seal package. The test was conducted as follows. A package with a laser score pattern was fit with taped extensions to mimic the rolling wrist action of a user. The portion of the package below the score line was fixed securely in the test device, while the extension tape affixed to the portion above the score line was secured in the tear tester jaws. The testing device was a Vinatoru seal strength tester. The tester jaws pulled the tape from the opposite side of the package and progressed across the top of the package and upward at a 30 degree angle. The tester jaws were fitted with a force transducer and the instantaneous force was recorded at regular intervals.
-
FIG. 17 illustrates the results of the test. The laser scribed, dashed ablation pattern as described herein (labeled “Dash”) allows for the package to open with approximately the same force, or ease of opening, as having a continuous laser score line (labeled “Continuous”) in the web material. Both of the laser scored packages necessitated substantially less opening force than the notched approach (labeled “Notch Edge/Fin”) and the micro-abrasion approach (labeled “Fancy Cut” for the FANCY CUT brand of packaging). - As demonstrated in the table of
FIG. 18 , however, the dashed ablation pattern has a consistently improved tensile strength over packages having a continuous score line. The data presented inFIG. 18 was collected by measuring the tensile strength of packages using an Instron testing device. The data demonstrates that the ablation pattern has sufficiently improved tensile strength over a continuous score line so as to be less likely to break in a vertical-form-fill-and-seal process while having approximately the same opening force, as shown inFIG. 17 . - Those skilled in the art will recognize that a wide variety of modifications, alterations, and combinations can be made with respect to the above described embodiments without departing from the spirit and scope of the invention. For example, many of the example embodiments discussed herein refer to generally rectangular shaped packages with specified, distinct edges. Other configurations such as oval or round packages are possible. Also, any variation of multiple scoring lines to provide multiple tear lines in a package can be provided. Such modifications, alterations, and combinations are to be viewed as being within the ambit of the inventive concept.
Claims (25)
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UAA200815333 UA100226C2 (en) | 2007-05-01 | 2008-12-31 | Method and device for packaging with laser-etching |
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ES09150018.1T ES2577540T3 (en) | 2007-05-01 | 2009-01-02 | Method and apparatus for making laser-marked containers |
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CN2009101187300A CN101513949B (en) | 2008-01-04 | 2009-01-04 | Method and apparatus for laser scored packaging |
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- 2008-04-23 CA CA002629705A patent/CA2629705A1/en not_active Abandoned
- 2008-05-01 DK DK08155553.4T patent/DK1988033T3/en active
- 2008-05-01 JP JP2008119696A patent/JP2008280089A/en active Pending
- 2008-05-01 PL PL08155553T patent/PL1988033T3/en unknown
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- 2008-05-01 EP EP08155553A patent/EP1988033B1/en active Active
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Also Published As
Publication number | Publication date |
---|---|
ATE516232T1 (en) | 2011-07-15 |
ES2367459T3 (en) | 2011-11-03 |
US20080274239A1 (en) | 2008-11-06 |
CA2629705A1 (en) | 2008-11-01 |
ES2577540T3 (en) | 2016-07-15 |
UA100226C2 (en) | 2012-12-10 |
PL1988033T3 (en) | 2011-11-30 |
JP2008280089A (en) | 2008-11-20 |
DK1988033T3 (en) | 2011-08-29 |
EP1988033B1 (en) | 2011-07-13 |
EP1988033A1 (en) | 2008-11-05 |
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Legal Events
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Owner name: KRAFT FOODS HOLDINGS, INC., ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DOLL, PAUL;REEL/FRAME:020320/0668 Effective date: 20070104 |
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AS | Assignment |
Owner name: KRAFT FOODS GLOBAL BRANDS LLC, ILLINOIS Free format text: MERGER;ASSIGNOR:KRAFT FOODS HOLDINGS, INC.;REEL/FRAME:023519/0396 Effective date: 20080801 Owner name: KRAFT FOODS GLOBAL BRANDS LLC,ILLINOIS Free format text: MERGER;ASSIGNOR:KRAFT FOODS HOLDINGS, INC.;REEL/FRAME:023519/0396 Effective date: 20080801 |
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Owner name: KRAFT FOODS GROUP BRANDS LLC, ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KRAFT FOODS GLOBAL BRANDS LLC;REEL/FRAME:029579/0546 Effective date: 20121001 |
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |