US20070274614A1 - Method for closing and sealing a woven polymeric bag - Google Patents

Method for closing and sealing a woven polymeric bag Download PDF

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Publication number
US20070274614A1
US20070274614A1 US11/441,517 US44151706A US2007274614A1 US 20070274614 A1 US20070274614 A1 US 20070274614A1 US 44151706 A US44151706 A US 44151706A US 2007274614 A1 US2007274614 A1 US 2007274614A1
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US
United States
Prior art keywords
bag
ply
adhesive
rear side
folds
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
Application number
US11/441,517
Inventor
James W. Abel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AMS ASSOCIATES Inc D/B/A SHAPIRO PACKAGING
Original Assignee
EXCEL PACKAGING LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US11/441,517 priority Critical patent/US20070274614A1/en
Application filed by EXCEL PACKAGING LLC filed Critical EXCEL PACKAGING LLC
Assigned to EXCEL PACKAGING, LLC reassignment EXCEL PACKAGING, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABEL, JAMES W.
Priority to EP07811922A priority patent/EP2027031A4/en
Priority to MX2008015023A priority patent/MX2008015023A/en
Priority to PCT/US2007/069560 priority patent/WO2007140216A2/en
Publication of US20070274614A1 publication Critical patent/US20070274614A1/en
Assigned to AMS ASSOCIATES, INC. D/B/A SHAPIRO PACKAGING reassignment AMS ASSOCIATES, INC. D/B/A SHAPIRO PACKAGING ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EXCEL PACKAGING, LLC
Priority to US12/817,079 priority patent/US20110255807A1/en
Priority to US13/011,620 priority patent/US20110230323A1/en
Priority to US13/251,968 priority patent/US20120070105A1/en
Priority to US13/544,614 priority patent/US20130022295A1/en
Priority to US14/626,673 priority patent/US9527259B2/en
Priority to US15/374,570 priority patent/US20170095990A1/en
Abandoned legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D33/00Details of, or accessories for, sacks or bags
    • B65D33/16End- or aperture-closing arrangements or devices
    • B65D33/18End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D31/00Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815Hot melt adhesives, e.g. thermoplastic adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • B29C66/4312Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328Paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/08Copolymers of ethylene
    • B29K2023/083EVA, i.e. ethylene vinyl acetate copolymer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10Polymers of propylene
    • B29K2023/12PP, i.e. polypropylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • B29L2031/7128Bags, sacks, sachets

Definitions

  • FIG. 1A is a perspective view of the rear of a bag
  • FIG. 1B is a perspective view of the front of a bag
  • FIG. 2 is an elevational view of one lateral side of the bag showing a slit in one crease;
  • FIG. 3 is an elevational view of the lateral side of the bag showing the portions to be folded grouped together;
  • FIG. 4 is an elevational view of the lateral side of the bag after a first rearward fold
  • FIG. 5 is an elevational view of the lateral side of the bag after a second rearward fold
  • FIG. 6 is an elevational view of the rear side of the bag after the first rearward fold.
  • FIG. 7 is an elevational view of the rear side of the bag after the second rearward fold.
  • FIGS. 1 through 7 of the drawings The various embodiments of the present invention and their advantages are best understood by referring to FIGS. 1 through 7 of the drawings.
  • the elements of the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the invention.
  • like numerals are used for like and corresponding parts of the various drawings.
  • any reference in the specification to “an embodiment,” “one embodiment,” “various embodiments,” or any variant thereof means that a particular feature or aspect of the invention described in conjunction with the particular embodiment is included in at least one embodiment of the present invention.
  • the appearance of the phrases “in one embodiment,” “in another embodiment,” or variations thereof in various places throughout the specification are not necessarily all referring to its respective embodiment.
  • FIGS. 1 A,B Shown in FIGS. 1 A,B is a bag A of the type often used for animal feed, or similar types of contents.
  • Bag A is made from a durable, flexible material suitable for such containment and storage of such material.
  • a durable, flexible material suitable for such containment and storage of such material.
  • One non-limiting example of such a material is polypropylene, and further, woven polypropylene.
  • Other examples include polyethylene and blends of polypropylene and polyethylene, paper to polypropylene or paper.
  • Bag A is formed from a tube-like structure which is cut to size. Then one end is closed and sealed, the bag is filled, and the opposing end is then sealed.
  • bag A includes a front side 11 , and an opposing rear side 12 .
  • the front side 11 may be considered the side on which prominent displays of labeling comprising, for example, graphic designs, trademarks, and the like, a notional example of which is represented in FIG. 1B .
  • bag A is collapsible, having a pair of opposing inwardly-projecting gusset-type folds 1 formed at the lateral sides 15 , 16 of the bag.
  • FIG. 2 illustrates an end portion of an unclosed bag A, viewed from the perspective of a gusset fold 1 , where two outer creases 3 , 4 forming a gusset fold 1 are referenced.
  • a slit 5 is made in an outer crease 4 , preferably the outer crease adjacent the side of bag A that will be the front of the bag 11 .
  • the slit 5 then creates a forward ply 6 and a rear ply 7 .
  • the forward ply 6 is kept in place while a first rearward fold ( FIG. 4 ) is formed by folding the rear ply 7 along with the rear fold 3 .
  • the first rearward fold is creased roughly at the vertex 5 a of slit 5 .
  • a second rearward fold ( FIG. 5 ) is created by fold the entire bag A rearward where it is creased approximately at or above the level reached by the ends of the plies 14 (indicated by ghosted line) after the first rearward fold.
  • Adhesive 9 may be any suitable adhesive for securing or bonding the material to itself.
  • adhesive 9 could be a hot melt adhesive known to those skilled in the relevant arts.
  • adhesive 9 is also deposited upon the rear surface of the bag A within the area at which the inner surface of ply 7 contacts it.
  • FIG. 7 depicts the completed folded closure.
  • Inner surface of rearward ply 7 (represented by dashed line) is bonded to rear surface 12 of bag A.
  • Front ply 6 extends roughly vertically with respect to the bag, beyond the crease of the first rearward fold.
  • FIG. 1B shows an exemplary bag A from the front perspective where it is apparent that an observer cannot see any seams, seals, or closures, thus presenting a more aesthetically pleasing package to the customer.
  • the present invention comprises a method for closing and sealing a tube-formed bag and bags produced thereby. While particular embodiments of the invention have been described, it will be understood, however, that the invention is not limited thereto, since modifications may be made by those skilled in the art, particularly in light of the foregoing teachings. It is, therefore, contemplated by the following claims to cover any such modifications that incorporate those features or those improvements that embody the spirit and scope of the present invention.

Abstract

A method for sealing a bag which is formed from a tube of material and has front and rear sides, a pair of opposing, inward-tending gusset folds, each of these folds having front and rear vertical creases, comprising the steps of slitting each of the opposing front creases along longitudinal their axes, obtaining front and rear plies. A first rearward fold is formed by rearwardly folding the rear plies together with the rear vertical creases such that the inner surface of the rear ply is visible. A second rearward fold is formed by rearwardly folding the first fold until the inner surface of the rear ply lays against the rear side of the bag.

Description

    BRIEF DESCRIPTION OF THE DRAWINGS
  • Embodiments are disclosed herein with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements.
  • FIG. 1A is a perspective view of the rear of a bag;
  • FIG. 1B is a perspective view of the front of a bag;
  • FIG. 2 is an elevational view of one lateral side of the bag showing a slit in one crease;
  • FIG. 3 is an elevational view of the lateral side of the bag showing the portions to be folded grouped together;
  • FIG. 4 is an elevational view of the lateral side of the bag after a first rearward fold;
  • FIG. 5 is an elevational view of the lateral side of the bag after a second rearward fold;
  • FIG. 6 is an elevational view of the rear side of the bag after the first rearward fold; and
  • FIG. 7 is an elevational view of the rear side of the bag after the second rearward fold.
  • DETAILED DESCRIPTION
  • The various embodiments of the present invention and their advantages are best understood by referring to FIGS. 1 through 7 of the drawings. The elements of the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the invention. Throughout the drawings, like numerals are used for like and corresponding parts of the various drawings.
  • The drawings represent and illustrate examples of the various embodiments of the invention, and not a limitation thereof. It will be apparent to those skilled in the art that various modifications and variations can be made in the present inventions without departing from the scope and spirit of the invention as described herein. For instance, features illustrated or described as part of one embodiment can be included in another embodiment to yield a still further embodiment. Moreover, variations in selection of materials and/or characteristics may be practiced to satisfy particular desired user criteria. Thus, it is intended that the present invention covers such modifications as come within the scope of the features and their equivalents.
  • Furthermore, any reference in the specification to “an embodiment,” “one embodiment,” “various embodiments,” or any variant thereof means that a particular feature or aspect of the invention described in conjunction with the particular embodiment is included in at least one embodiment of the present invention. Thus, the appearance of the phrases “in one embodiment,” “in another embodiment,” or variations thereof in various places throughout the specification are not necessarily all referring to its respective embodiment.
  • Shown in FIGS. 1A,B is a bag A of the type often used for animal feed, or similar types of contents. Bag A is made from a durable, flexible material suitable for such containment and storage of such material. One non-limiting example of such a material is polypropylene, and further, woven polypropylene. Other examples include polyethylene and blends of polypropylene and polyethylene, paper to polypropylene or paper. Bag A is formed from a tube-like structure which is cut to size. Then one end is closed and sealed, the bag is filled, and the opposing end is then sealed. For orientational reference, bag A includes a front side 11, and an opposing rear side 12. The front side 11 may be considered the side on which prominent displays of labeling comprising, for example, graphic designs, trademarks, and the like, a notional example of which is represented in FIG. 1B. For storage purposes when the bag is empty, bag A is collapsible, having a pair of opposing inwardly-projecting gusset-type folds 1 formed at the lateral sides 15, 16 of the bag. FIG. 2 illustrates an end portion of an unclosed bag A, viewed from the perspective of a gusset fold 1, where two outer creases 3, 4 forming a gusset fold 1 are referenced.
  • A slit 5 is made in an outer crease 4, preferably the outer crease adjacent the side of bag A that will be the front of the bag 11. The slit 5 then creates a forward ply 6 and a rear ply 7. The forward ply 6 is kept in place while a first rearward fold (FIG. 4) is formed by folding the rear ply 7 along with the rear fold 3. The first rearward fold is creased roughly at the vertex 5 a of slit 5. A second rearward fold (FIG. 5) is created by fold the entire bag A rearward where it is creased approximately at or above the level reached by the ends of the plies 14 (indicated by ghosted line) after the first rearward fold.
  • Referring to FIGS. 6 and 7, means for securing the fold is illustrated in FIG. 6 where after the first rearward fold, adhesive 9 is deposited on the inner surface of rearward ply 7. Adhesive 9 may be any suitable adhesive for securing or bonding the material to itself. By way of non-limiting example, adhesive 9 could be a hot melt adhesive known to those skilled in the relevant arts. In another embodiment, adhesive 9 is also deposited upon the rear surface of the bag A within the area at which the inner surface of ply 7 contacts it.
  • FIG. 7 depicts the completed folded closure. Inner surface of rearward ply 7 (represented by dashed line) is bonded to rear surface 12 of bag A. Front ply 6 extends roughly vertically with respect to the bag, beyond the crease of the first rearward fold. FIG. 1B, then, shows an exemplary bag A from the front perspective where it is apparent that an observer cannot see any seams, seals, or closures, thus presenting a more aesthetically pleasing package to the customer.
  • As described above and shown in the associated drawings, the present invention comprises a method for closing and sealing a tube-formed bag and bags produced thereby. While particular embodiments of the invention have been described, it will be understood, however, that the invention is not limited thereto, since modifications may be made by those skilled in the art, particularly in light of the foregoing teachings. It is, therefore, contemplated by the following claims to cover any such modifications that incorporate those features or those improvements that embody the spirit and scope of the present invention.

Claims (27)

1. A method for sealing a bag, said bag formed from a tube of material and having front side and a rear side, and a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:
a. slitting each of said front creases along longitudinal axes thereof, thereby obtaining front and rear plies;
b. forming a first rearward fold by rearwardly folding said rear plies together with said rear vertical creases such that an inner surface of said rear ply is visible; and
c. forming a second rearward fold by rearwardly folding said first fold wherein said inner surface of said rear ply lays against said rear side of said bag.
2. The method of claim 1, further comprising the step of depositing an adhesive upon said inner surface of said rear ply.
3. The method of claim 2, further comprising the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it.
4. The method of claim 3, wherein said material is polypropylene.
5. The method of claim 1, wherein said material is polypropylene.
6. The method of claim 5, further comprising the step of depositing an adhesive upon said inner surface of said rear ply.
7. The method of claim 6, further comprising the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it.
8. A flexible bag formed from a tube of material and having front side and a rear side, and a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said bag having at least one sealed closure formed by a method comprising the steps of:
a. slitting each of said front creases along longitudinal axes thereof, thereby obtaining front and rear plies;
b. forming a first rearward fold by rearwardly folding said rear plies together with said rear vertical creases such that an inner surface of said rear ply is visible; and
c. forming a second rearward fold by rearwardly folding said first fold wherein said inner surface of said rear ply lays against said rear side of said bag.
9. The bag of claim 8, wherein said method further comprises the step of depositing an adhesive upon said inner surface of said rear ply.
10. The bag of claim 9, wherein said method further comprises the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it.
11. The bag of claim 10, wherein said material is polypropylene.
12. The bag of claim 8, wherein said material is polypropylene.
13. The bag of claim 12, wherein said method further comprises the step of depositing an adhesive upon said inner surface of said rear ply.
14. The bag of claim 13, wherein said method further comprises the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it.
15. A method of sealing a bag, said bag formed from a tube of material and having front side and a rear side, and a pair of lateral, opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:
a. parting said material longitudinally along said front crease;
b. rolling a rear ply resulting from said step of parting along with rear portion of said bag proximal to said rear ply such that a surface of said rear ply opposes the rear side of said bag; and
c. applying an adhesive element to said surface, said adhesive being for the bonding of said surface with said rear side.
16. The method of claim 15, wherein said step of applying adhesive further comprises applying adhesive to said rear side in the area contacted by said rear ply.
17. The method of claim 15, wherein said material is polypropylene.
18. A bag sealed by the method of claim 15.
19. The bag of claim 18, wherein said step of applying adhesive further comprises applying adhesive to said rear side in the area contacted by said rear ply.
20. The bag of claim 19, wherein said material is polypropylene.
21. A flexible bag comprising:
a tube of material comprising:
a front side;
a rear side;
a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases and each of said folds between said front side and said rear side;
at least one sealed closure comprising:
a front ply and a rear ply, said front ply and said rear ply being separated by a slit along said front creases along longitudinal axes thereof, and said rear ply having an outer and inner surface;
a first rearward fold causing said outer surface of said rear ply to oppose a first portion of the rear side of the bag; and
a second rearward fold causing said inner surface of said rear ply to oppose a second portion of the rear side of the bag.
22. The flexible bag of claim 21 further comprising an adhesive upon said inner surface of said rear ply.
23. The flexible bag of claim 22 further comprising the adhesive upon the rear side of said flexible bag where said inner surface lays against it.
24. The flexible bag of claim 23, wherein said tube of material is polypropylene.
25. The flexible bag of claim 21, wherein said tube of material is polypropylene.
26. The flexible bag of claim 25, further comprising an adhesive upon said inner surface of said rear ply.
27. The flexible bag of claim 26 further comprising the adhesive upon the rear side of said flexible bag where said inner surface lays against it.
US11/441,517 2006-05-26 2006-05-26 Method for closing and sealing a woven polymeric bag Abandoned US20070274614A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US11/441,517 US20070274614A1 (en) 2006-05-26 2006-05-26 Method for closing and sealing a woven polymeric bag
EP07811922A EP2027031A4 (en) 2006-05-26 2007-05-23 Method for closing and sealing a woven polymeric bag
MX2008015023A MX2008015023A (en) 2006-05-26 2007-05-23 Method for closing and sealing a woven polymeric bag.
PCT/US2007/069560 WO2007140216A2 (en) 2006-05-26 2007-05-23 Method for closing and sealing a woven polymeric bag
US12/817,079 US20110255807A1 (en) 2006-05-26 2010-06-16 Woven Polymeric Bag with Pinch-Bottom Seal and Method of Making the Same
US13/011,620 US20110230323A1 (en) 2006-05-26 2011-01-21 Assembly for forming a bag with a pinch-bottom seal
US13/251,968 US20120070105A1 (en) 2006-05-26 2011-10-03 Woven polymeric bag and a method for closing and sealing
US13/544,614 US20130022295A1 (en) 2006-05-26 2012-07-09 Gusseted polymeric bag having stepped bottom hot air sealed
US14/626,673 US9527259B2 (en) 2006-05-26 2015-02-19 Method of hot air sealing polymeric bag
US15/374,570 US20170095990A1 (en) 2006-05-26 2016-12-09 Method of hot air sealing polymeric bag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/441,517 US20070274614A1 (en) 2006-05-26 2006-05-26 Method for closing and sealing a woven polymeric bag

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US12/817,079 Continuation US20110255807A1 (en) 2006-05-26 2010-06-16 Woven Polymeric Bag with Pinch-Bottom Seal and Method of Making the Same
US12/817,079 Continuation-In-Part US20110255807A1 (en) 2006-05-26 2010-06-16 Woven Polymeric Bag with Pinch-Bottom Seal and Method of Making the Same
US13/251,968 Continuation US20120070105A1 (en) 2006-05-26 2011-10-03 Woven polymeric bag and a method for closing and sealing

Publications (1)

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US11/441,517 Abandoned US20070274614A1 (en) 2006-05-26 2006-05-26 Method for closing and sealing a woven polymeric bag
US13/251,968 Abandoned US20120070105A1 (en) 2006-05-26 2011-10-03 Woven polymeric bag and a method for closing and sealing

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US13/251,968 Abandoned US20120070105A1 (en) 2006-05-26 2011-10-03 Woven polymeric bag and a method for closing and sealing

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US (2) US20070274614A1 (en)
EP (1) EP2027031A4 (en)
MX (1) MX2008015023A (en)
WO (1) WO2007140216A2 (en)

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US20150165715A1 (en) * 2006-05-26 2015-06-18 Ams Associates, Inc. Method of hot air sealing polymeric bag
US20170095990A1 (en) * 2006-05-26 2017-04-06 Ams Associates, Inc. Method of hot air sealing polymeric bag
US20110230323A1 (en) * 2006-05-26 2011-09-22 James Alan Robinette Assembly for forming a bag with a pinch-bottom seal
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US20150298418A1 (en) * 2010-04-22 2015-10-22 Coating Excellence International Llc Method and system for making a stepped end
US10654621B2 (en) * 2010-04-22 2020-05-19 Coating Excellence Internationl, LLC Method and system for making a stepped end
CN105774034A (en) * 2014-12-23 2016-07-20 常熟市鑫盛制袋有限责任公司 Automatic bottom sealing device used for bottom sealing of wide-thread woven bag
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Also Published As

Publication number Publication date
EP2027031A4 (en) 2012-04-18
WO2007140216B1 (en) 2008-05-08
WO2007140216A2 (en) 2007-12-06
US20120070105A1 (en) 2012-03-22
MX2008015023A (en) 2009-04-15
EP2027031A2 (en) 2009-02-25
WO2007140216A3 (en) 2008-03-20

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