US3673041A - Heat sealer - Google Patents
Heat sealer Download PDFInfo
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- US3673041A US3673041A US3673041DA US3673041A US 3673041 A US3673041 A US 3673041A US 3673041D A US3673041D A US 3673041DA US 3673041 A US3673041 A US 3673041A
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- sealing
- seal
- sheets
- opposed
- heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
- B29C65/305—Electrical means involving the use of cartridge heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint 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
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General 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
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General 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
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
- B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General 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
- B29C66/73—General 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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General 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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7373—Joining soiled or oxidised materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81264—Mechanical properties, e.g. hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/81457—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/849—Packaging machines
- B29C66/8491—Packaging machines welding through a filled container, e.g. tube or bag
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- 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
- B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General 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
- B29C66/71—General 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
- B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/007—Hardness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/14—Surface bonding means and/or assembly means with shaping, scarifying, or cleaning joining surface only
Definitions
- HEAT SEALERv Filed Sept. 8, 1970 2 Sheets-Sheet 2 le' le l /9 /10 I l-/e United States Patent O 3,673,041 HEAT SEALER Gerald L. Schulz, Hollistou, and Raymond T. Mansur, Framingham, Mass., assignors to the United States of America as represented by the Secretary of the Army Filed Sept. 8, 1970, Ser. No. 70,167 Int. Cl. B32b 31/00, 3/ 00; C09j 5/00 U.S. Cl.
- This invention relates broadly to a method and apparatus for forming a fused juncture between opposed thermoplastic sheets, lms or coated surfaces. More particularly, this invention relates to a method and apparatus for heat sealing wherein the opposed surfaces are contaminated with aqueous or oily liquids or fatty substances.
- Closure seals of flexible packaging materials are 0btained
- Such sealing is accomplished by pressing the opposed layers between rigid, heated bars or jaws under pressure until the layers have fused.
- the sealing jaws typically, have either flat or serrated surfaces.
- a positive heat seal of interface surfaces contaminated with liquids and/or fatty materials is obtained according to the present invention by employing a transversely radiused sealing bar in conjunction with a resilient anvil. Such a device functions to physically force liquid or soft fatty contaminants from the seal area before fusion of the layers occurs.
- FIG. l is side view in elevation of a heat sealing device according to the present invention.
- FIGS. 2 and 3 are transverse cross sectional views of prior art heat sealing apparatus and FIG. 4 is a plan view of a seal obtained with the apparatus of FIGS. 2 and 3.
- FIGS. 5, ⁇ 6, 8, and 10 are transverse cross-sectional views depicting stages in the heat sealing of pouches with the apparatus of FIG. l.
- FIGS. 7, 9, and 11 are plan views of the pouch seal area at various stages of the sealing process.
- FIG. 1 there s illustrated in FIG. 1 an embodiment of this invention which will produce a positive heat seal between opposed layers of thermoplastic material whose seal surfaces have been contaminated with liquids or soft, fatty substances.
- the apparatus shown in FIG. 1 is conventional except for the sealing bar and the anvil material.
- a flat base 10 supports a right angled bracket 11, one leg of which extends upwardly from said base and the other leg being parallel with said base.
- Air cylinder 12 is attached to said bracket and pneumatically forces rod 13 under pressure toward and away from said base.
- Attached to the free end of the rod is the heat sealer 14 consisting of a heater block 1S and a sealer bar 0r jaw 16.
- the heater block portion contains a number of electrical resistance cartridge heaters 17 which produce the desired level of heat within the block, which heat is conducted to the sealer jaw.
- the sealer jaw as is shown in FIGS. l and 5, is transversely radiused along its entire length to form a rounded bearing surface 16'.
- a resilient anvil 19 seated in an anvil support 18 is located on the base directly below the heat sealer and limits the downward movement of the sealer jaw when the air cylinder lis. activated.
- FIG. Z diagrammatically illustrates a conventional heat sealing device having a jaw 20 extending down from the heater block Z1 which jaw has a ilat bearing surface 20' and a rigid ⁇ anvil 23 spaced from said jaw. The bearing surface of the jaw is parallel with the bearing surface of the anvil. Two opposed sheets 24 of thermoplastic material having a liquid 25 contaminant coating the seal area are positioned on the anvil 23 and, in FIG. 3, the
- heated jaw 20 is brought against the vsheets 24 with suiiicient pressure and for sufficient time to seal the sheets together. As shown in FIG. 4, there is trapped within the seal area 26, pockets of liquid material 25, which will reduce the strength of the seal or may even produce a failure in vthe seal.
- a hair line seal 32 is produced across the width of the pouch opening as shown in FIG. 7. Asy the jaw continues its downward motion as in FIG.
- FIG. 10 where the anvil has yielded substantially under the force of the jaw. This position is maintaineduntil suicient heat has been transferred to fuse the lm surfaces 30 and form the continuous seal G2 shown in FIG. 11.
- the anvil material be resilient, iLe. capable of undergoing elastic deformation under the pressure of the transversely radiused jaw.
- Elastomers such as silicone rubbers, having a durometer (Shore A) within the range of 55 to 80 have the desired physical characteristics for this application but greater durability of the anvil is obtained when ⁇ the elastomer has a durometer within the range of-from about 65 to about 75.
- the sealing jaw be curved to provide the proper wiping or squeegee action.
- the jaw preferably varies in width from about 1A: to about 1/2 inch and has a transverse radius varying 1A to 1/2 inch.
- Example I To determine the effects of liquid and soft fatty substance contamination on seals produced according to this invention, the seal interface surfaces of pouches were coated with each type of contaminant and sealed at the optimum conditions established for each of the materials. A second set of samples, prepared in the same manner, was sealed in a at bar sealer. Seal strength values were measured on an Instron tensile tester, using 1/2 inch wide specimens cut from the closure seal of test packages. The
- the transversely radiused sealing bar (also referred to as the curved bar) had a width of inch and a radius of M: inch and the anvil was a silicon rubber material having a durometer of 72.
- the control sealer had a at 1 inch wide bar, opposed by a silicone rubber having a durometer of 57.
- the packaging materials used were (l) a 0.003 inch modified polyolefin- 0.00035 inch aluminum foil-0.0005 inch polyester and (2) a 0.003 inch high density polyethylene-0.00035 inch aluminum foil-0.0005 inch polyester.
- the sealing conond The fatty substance used as a contaminant in the seal areas was margarine.
- Table 1 shows the average seal strength values in pounds per inch of seal width obtained with at and curved bar Sealers. Under ideal conditions, i.e. clean seal surfaces sealed at optimum conditions, the at bar seals were slightly stronger than those made on the curved bar sealer. When the seal surfaces were contaminated with water or grease, the strength of the flat bar seals dropped to less than the minimum acceptable strength of 10 pounds per inch, while those made on the curved 'bar sealer showed considerably less strength loss and were all above the 10 pound minimum. v
- Pouches made from the two packaging materials em ployed in Example I were lled with a mixture of beans and tomato sauce and sealed on the flat and curved bar sealers at the conditions set forth in Example I. Prior to sealing, a coating of sauce from lthe product was spread evenly over the entire seal interface surfaces of each pouch. Excess air was removed prior to sealing. Some of the sealed packages were heat processed at 250 F. for. 30 minutes. Internal pressure burst tests were conducted on retorted and unretorte'd packages. Pressurization was accomplished with a hypodermic needle through a sealant patch on the center of each pouch. During pressurization, the pouches were restrained between two rigid plates to limit expansion to one inch. A pressure increase of 1 p.s.i.g.
- Table 2 shows the average burst strength values of pouches with clean and contaminated curved bar and at bar closure seals. There were no appreciable diiferences between clean and contaminated packages when sealed on the curved bar sealer of this invention. 'Ihe packages sealed on the flat bar were weakened by contamination to the Point that they could not be fully expanded by pressurization before leakage occurred.
- This invention also contemplates the usecof a steam flush as an, adjunct to the curved -bar sealing to reduce the headspace gas volume in the pouch and to remove fibrous and particulate material from the seal area.
- the curved bar sealer makes it possible to employ a steam flush since a positive seal is produced in the presence of moisture on the seal surface interfaces. Seal surfaces. of pouches contaminated with ground beef in barbecue sauce can vbe cleaned by flushing with steam for 21/2 seconds.
- a steam nozzle adapted to direct steam at an angle of 45 degrees to the sides of the pouch, has been employed to distribute steam over the entire seal surface. Residual gas volumes resulting from steam flushing of pouches were found to be well below the maximum allowable headspace gas volume of 6 cc.
- a method of forming a fused juncture between two superimposed flexible sheets having opposed thermoplastic surfaces, said surfaces being susceptible to the presence of Huid contaminants in the area to be sealed which comprises applying heat and pressure to the area of said sheets which are to be fused together by causing a transversely radiused, heated sealing bar to press said sheets against an anvil having a resilient surface to squeeze any iluid con- References Cited UNITED STATES PATENTS 3,035,381 5/1962 Hosso 156-515 2,638,963 5/1953 Frederick et al 156-515 3,078,201 2/1963 Christie 156-306 2,941,575 6/1960 Malmberg et al 156-515 2,712,343 7/1955 Stanton 156-583 3,017,315 1/1962 Doyle 156-583 DOUGLAS I. DRUMMOND, Primary yExaminer U.S. Cl. X.R.
Abstract
HEAT SEALING OPPOSED THERMOPLASTIC SURFACES OF OPEN ENDED POUCHES, WHOSE SEALING SURFACES ARE LIKELY TO BE CONTAMINATED WITH LIQUIDS OR FATTY SUBSTANCES IS ACCOMPLISHED BY FORCING A TRANSVERSELY RADIUSED, HEATED SEALING BAR AGAINST THE OPPOSED UNSEALED SHEETS OF THE POUCH WHICH ARE SUPPORTED BY A RESILIENT ANVIL, THEREBY SQUEEZING THE CONTAMINANTS OUT OF THE SEALING AREA BEFORE THE SHEETS FUSE TOGETHER AND IN THOSE CASES WHERE SOLID PAR-
TICULATE CONTAMINANTS ARE FOUND IN THE SEALING AREA UTILIZING STEAM FLUSHING TO CLEAN THE SEALING SURFACES PRIOR TO SEALING.
TICULATE CONTAMINANTS ARE FOUND IN THE SEALING AREA UTILIZING STEAM FLUSHING TO CLEAN THE SEALING SURFACES PRIOR TO SEALING.
Description
June 2 7, 1972 G. SCHULZ ETAL 3,673,041
HEAT SEALER June 27, 1972 l G, SCHULZ ETAL 3,673,041
HEAT SEALERv Filed Sept. 8, 1970 2 Sheets-Sheet 2 le' le l /9 /10 I l-/e United States Patent O 3,673,041 HEAT SEALER Gerald L. Schulz, Hollistou, and Raymond T. Mansur, Framingham, Mass., assignors to the United States of America as represented by the Secretary of the Army Filed Sept. 8, 1970, Ser. No. 70,167 Int. Cl. B32b 31/00, 3/ 00; C09j 5/00 U.S. Cl. 156-306 3 Claims ABSTRACT F THE DISCLOSURE Heat sealing opposed thermoplastic surfaces of open ended pouches, whose sealing surfaces are likely to be contaminated with liquids or fatty substances is accomplished by forcing a transversely radiused, heated sealing bar against the opposed unsealed sheets of the pouch which are supported by a resilient anvil, thereby squeezing the contaminants out of the sealing area before the sheets fuse together and in those cases where solid particulate contaminants are found in the sealing area utilizing steam flushing to clean the sealing surfaces prior to sealing.
The invention described herein may be manufactured, used and licensed by or for the Government for govemmental purposes without the payment to us of any royalty thereon.
BACKGROUND OF THE INVENTION This invention relates broadly to a method and apparatus for forming a fused juncture between opposed thermoplastic sheets, lms or coated surfaces. More particularly, this invention relates to a method and apparatus for heat sealing wherein the opposed surfaces are contaminated with aqueous or oily liquids or fatty substances.
Closure seals of flexible packaging materials are 0btained |by fusion or heat sealing of the inner thermoplastic layer of the opposed sheets of material.
Such sealing is accomplished by pressing the opposed layers between rigid, heated bars or jaws under pressure until the layers have fused. The sealing jaws, typically, have either flat or serrated surfaces.
In recent years, flexible packaging has made tremendous inroads into the food packaging field. This impact is manifested by the increase in the boil-in-bag and frozen food markets featuring flexible packaging. However, the nonfrozen, shelf-stable analogue of the boil-in-bag, i.e., thermally processed food in a flexible package, remains as one area of great potential application. During the past decade, a considerable amount of progress has been made in the development of llexible packages for thermoprocessed foods. Flexible packaging materials are now available which are capable of withstanding the rigors of retorting; processing techniques have been developed and proven; and levels of extractable substances from processed materials are well within the established safety limits. Storage stability and resistance of flexible packages to damage have been found to be more than adequate.
One major problem area remaining, however, is the large number of package failures which are obtained in flexible packaging applications, due principally to defective closure seals. The primary cause of such defective closure seals is the presence of occluded matter in the closure seal area. Efforts to prevent contamination of the seal surfaces have not been successful. Since present methods require the filling of packages at high speeds through a relatively small opening, positive prevention of contamination resulting from the splashing of product material from a lling horn to the package surfaces has not been attainable, even with the most sophisticated filling equipment available. Contamination of the sealing surfaces of the flexible packaging material by particles and fibers, as well as liquid and soft fatty contaminants can result in a defective closure seal. Detection of particulate contamination, although diflicult and unreliable, is possible by visual inspection of the seal surfaces prior to sealing. Visual detection of small amounts of liquids or fatty substances, however, is virtually impossible. In view of the likelihood of seal surface contamination and the dilliculty in perceiving this contamination, it is essential that there be developed a technique that Will provide a positive heat seal in the presence of liquids, fatty'substances or both on the seal interface surfaces.
SUMMARY A positive heat seal of interface surfaces contaminated with liquids and/or fatty materials is obtained according to the present invention by employing a transversely radiused sealing bar in conjunction with a resilient anvil. Such a device functions to physically force liquid or soft fatty contaminants from the seal area before fusion of the layers occurs.
BRIEF DESCRIPTION OF THE DRAWING FIG. l is side view in elevation of a heat sealing device according to the present invention.
FIGS. 2 and 3 are transverse cross sectional views of prior art heat sealing apparatus and FIG. 4 is a plan view of a seal obtained with the apparatus of FIGS. 2 and 3.
FIGS. 5, `6, 8, and 10 are transverse cross-sectional views depicting stages in the heat sealing of pouches with the apparatus of FIG. l.
FIGS. 7, 9, and 11 are plan views of the pouch seal area at various stages of the sealing process.
DESCRIPTION OF THE PREFERRED IEMBODIMENT With reference to the drawing, there s illustrated in FIG. 1 an embodiment of this invention which will produce a positive heat seal between opposed layers of thermoplastic material whose seal surfaces have been contaminated with liquids or soft, fatty substances. The apparatus shown in FIG. 1 is conventional except for the sealing bar and the anvil material. A flat base 10, supports a right angled bracket 11, one leg of which extends upwardly from said base and the other leg being parallel with said base. Air cylinder 12 is attached to said bracket and pneumatically forces rod 13 under pressure toward and away from said base. Attached to the free end of the rod is the heat sealer 14 consisting of a heater block 1S and a sealer bar 0r jaw 16. The heater block portion contains a number of electrical resistance cartridge heaters 17 which produce the desired level of heat within the block, which heat is conducted to the sealer jaw. The sealer jaw, as is shown in FIGS. l and 5, is transversely radiused along its entire length to form a rounded bearing surface 16'. A resilient anvil 19 seated in an anvil support 18 is located on the base directly below the heat sealer and limits the downward movement of the sealer jaw when the air cylinder lis. activated.
yIn attempting to heat seal opposed surfaces of thermoplastic material contaminated with liquid or soft fatty materials, as are commonly found in food products, with conventional heat sealing equipment the contaminants tend to be trapped within the seal area weakening the seal. FIG. Z diagrammatically illustrates a conventional heat sealing device having a jaw 20 extending down from the heater block Z1 which jaw has a ilat bearing surface 20' and a rigid `anvil 23 spaced from said jaw. The bearing surface of the jaw is parallel with the bearing surface of the anvil. Two opposed sheets 24 of thermoplastic material having a liquid 25 contaminant coating the seal area are positioned on the anvil 23 and, in FIG. 3, the
heated jaw 20 is brought against the vsheets 24 with suiiicient pressure and for sufficient time to seal the sheets together. As shown in FIG. 4, there is trapped within the seal area 26, pockets of liquid material 25, which will reduce the strength of the seal or may even produce a failure in vthe seal.
'I'he sequence of events and resulting seal produced in accordance with the instant invention are shown in FIGS. to 11. Two sheets =30 of thermoplastic material comprising the open end of -a pouch vare positioned over the resilient anvil 19. The inner surfaces of the sheets are coated -with a liquid contaminant 31 in the area to be fused or sealed together. As the heated, transversely radiused jaw 1-6 is brought into initial contact with the sheets 30, as in PIG. 6, a hair line seal 32 is produced across the width of the pouch opening as shown in FIG. 7. Asy the jaw continues its downward motion as in FIG. 8, the top surface of the anvil 19 yields under the pressure and the squeegee action of the heated jaw against the yielding anvil forces the contaminant 31 away from the center of the seal 32 as depicted in FIG. 9. 'I'he nal step is shown in FIG. 10 where the anvil has yielded substantially under the force of the jaw. This position is maintaineduntil suicient heat has been transferred to fuse the lm surfaces 30 and form the continuous seal G2 shown in FIG. 11.
To obtain the desi-red contaminant-free it is necesl sary that the anvil material be resilient, iLe. capable of undergoing elastic deformation under the pressure of the transversely radiused jaw. Elastomers, such as silicone rubbers, having a durometer (Shore A) within the range of 55 to 80 have the desired physical characteristics for this application but greater durability of the anvil is obtained when` the elastomer has a durometer within the range of-from about 65 to about 75. It is also necessary that the sealing jaw be curved to provide the proper wiping or squeegee action. The jaw preferably varies in width from about 1A: to about 1/2 inch and has a transverse radius varying 1A to 1/2 inch.
The pressure, temperature and dwell times necessary to accomplish the seal will vary with the materials being sealed and such conditions are well-known in the art. The following examples illustrate the results obtained by the practice of this invention.
Example I To determine the effects of liquid and soft fatty substance contamination on seals produced according to this invention, the seal interface surfaces of pouches were coated with each type of contaminant and sealed at the optimum conditions established for each of the materials. A second set of samples, prepared in the same manner, was sealed in a at bar sealer. Seal strength values were measured on an Instron tensile tester, using 1/2 inch wide specimens cut from the closure seal of test packages. The
loading rate (crosshead speed) used was ten inches per minute.
In this example the transversely radiused sealing bar (also referred to as the curved bar) had a width of inch and a radius of M: inch and the anvil was a silicon rubber material having a durometer of 72. The control sealer had a at 1 inch wide bar, opposed by a silicone rubber having a durometer of 57. The packaging materials used were (l) a 0.003 inch modified polyolefin- 0.00035 inch aluminum foil-0.0005 inch polyester and (2) a 0.003 inch high density polyethylene-0.00035 inch aluminum foil-0.0005 inch polyester. The sealing conond. The fatty substance used as a contaminant in the seal areas was margarine.
Table 1 shows the average seal strength values in pounds per inch of seal width obtained with at and curved bar Sealers. Under ideal conditions, i.e. clean seal surfaces sealed at optimum conditions, the at bar seals were slightly stronger than those made on the curved bar sealer. When the seal surfaces were contaminated with water or grease, the strength of the flat bar seals dropped to less than the minimum acceptable strength of 10 pounds per inch, while those made on the curved 'bar sealer showed considerably less strength loss and were all above the 10 pound minimum. v
Pouches made from the two packaging materials em ployed in Example I were lled with a mixture of beans and tomato sauce and sealed on the flat and curved bar sealers at the conditions set forth in Example I. Prior to sealing, a coating of sauce from lthe product was spread evenly over the entire seal interface surfaces of each pouch. Excess air was removed prior to sealing. Some of the sealed packages were heat processed at 250 F. for. 30 minutes. Internal pressure burst tests were conducted on retorted and unretorte'd packages. Pressurization was accomplished with a hypodermic needle through a sealant patch on the center of each pouch. During pressurization, the pouches were restrained between two rigid plates to limit expansion to one inch. A pressure increase of 1 p.s.i.g. per minute was used. Table 2 shows the average burst strength values of pouches with clean and contaminated curved bar and at bar closure seals. There were no appreciable diiferences between clean and contaminated packages when sealed on the curved bar sealer of this invention. 'Ihe packages sealed on the flat bar were weakened by contamination to the Point that they could not be fully expanded by pressurization before leakage occurred.
This invention also contemplates the usecof a steam flush as an, adjunct to the curved -bar sealing to reduce the headspace gas volume in the pouch and to remove fibrous and particulate material from the seal area. The curved bar sealer makes it possible to employ a steam flush since a positive seal is produced in the presence of moisture on the seal surface interfaces. Seal surfaces. of pouches contaminated with ground beef in barbecue sauce can vbe cleaned by flushing with steam for 21/2 seconds. A steam nozzle, adapted to direct steam at an angle of 45 degrees to the sides of the pouch, has been employed to distribute steam over the entire seal surface. Residual gas volumes resulting from steam flushing of pouches were found to be well below the maximum allowable headspace gas volume of 6 cc. Visual examination of pouches prior to retorting showed no defective seals and all test packages survived retorting with no visible evidence of closure seal degradation. Pressure tests of retorted pouches showed an average burst pressure of 12.9 p.s.i.g. which compares favorably with values obtained previously from both ilat and curved bar seals on clean packages.
Although several embodiments and examples of the invention have been described herein, they are intended to be merely illustrative, and various modilications can be made therein without departing from the spirit and scope of the invention as delined in the following claims.
We claim:
1. A method of forming a fused juncture between two superimposed flexible sheets having opposed thermoplastic surfaces, said surfaces being susceptible to the presence of Huid contaminants in the area to be sealed, which comprises applying heat and pressure to the area of said sheets which are to be fused together by causing a transversely radiused, heated sealing bar to press said sheets against an anvil having a resilient surface to squeeze any iluid con- References Cited UNITED STATES PATENTS 3,035,381 5/1962 Hosso 156-515 2,638,963 5/1953 Frederick et al 156-515 3,078,201 2/1963 Christie 156-306 2,941,575 6/1960 Malmberg et al 156-515 2,712,343 7/1955 Stanton 156-583 3,017,315 1/1962 Doyle 156-583 DOUGLAS I. DRUMMOND, Primary yExaminer U.S. Cl. X.R.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US7016770A | 1970-09-08 | 1970-09-08 |
Publications (1)
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US3673041A true US3673041A (en) | 1972-06-27 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US3673041D Expired - Lifetime US3673041A (en) | 1970-09-08 | 1970-09-08 | Heat sealer |
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US (1) | US3673041A (en) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3830681A (en) * | 1972-11-08 | 1974-08-20 | Fmc Corp | Package sealing in steam atmosphere |
US3845606A (en) * | 1972-11-08 | 1974-11-05 | D Wilson | Package sealing in steam atmosphere |
US3960636A (en) * | 1974-06-19 | 1976-06-01 | Mobil Oil Corporation | Method and apparatus for the production of shear seals in thermoplastic materials |
US4067175A (en) * | 1976-08-04 | 1978-01-10 | Isaac Vinokur | Device for sealing containers made of heat-sealable material |
US4262708A (en) * | 1979-09-14 | 1981-04-21 | Reynolds Metals Company | Method and apparatus for treating flexible containers |
US4369611A (en) * | 1980-07-07 | 1983-01-25 | Rexham Corporation | Top heat sealing unit for pouches |
US4379008A (en) * | 1979-03-03 | 1983-04-05 | Ab Akerlund & Rausing | Method and apparatus for sealing cardboard containers |
EP0076966A1 (en) * | 1981-10-08 | 1983-04-20 | Ab Tetra Pak | A method and an arrangement for the heat-sealing of packing laminate |
EP0077756A1 (en) * | 1981-10-19 | 1983-04-27 | Schweizerische Aluminium Ag | Apparatus for closing filled containers |
DE3141898A1 (en) * | 1981-10-22 | 1983-05-11 | Schweizerische Aluminium AG, 3965 Chippis | Sealing process, in particular heat-sealing process and apparatus for closing filled containers |
WO1985001268A1 (en) * | 1983-09-15 | 1985-03-28 | Baxter Travenol Laboratories, Inc. | Compartment mixing container having breakable connection between compartments |
US4549388A (en) * | 1983-09-13 | 1985-10-29 | Lantech, Inc. | Package sealing apparatus |
US4555293A (en) * | 1983-07-26 | 1985-11-26 | French Robert C | Method and apparatus for thermo-bonding seams in thermoplastic material |
US4672793A (en) * | 1984-01-06 | 1987-06-16 | W. R. Grace & Co. | Molded meat vacuum packaging |
US4925687A (en) * | 1988-08-08 | 1990-05-15 | W. R. Grace & Co.-Conn. | Turkey package |
US4961302A (en) * | 1989-05-30 | 1990-10-09 | W. A. Lane Inc. | Sealing bars having asymmetrical sealing surfaces |
US5484001A (en) * | 1993-06-15 | 1996-01-16 | W. R. Grace & Co.-Conn | Method for application of smoke color to inside of bag and apparatus therefor |
EP0730946A2 (en) * | 1995-03-08 | 1996-09-11 | Shikoku Kakoki Co., Ltd. | Heat-sealing device for liquid-filled tube |
US6372274B2 (en) * | 1998-06-22 | 2002-04-16 | Cryovac, Inc. | Process for making a packaged product |
US6395321B1 (en) * | 1999-06-01 | 2002-05-28 | Schreiber Foods, Inc | Process for sealing food products such as processed cheese slices |
AU762118B2 (en) * | 1998-06-22 | 2003-06-19 | Cryovac, Inc. | Packaged food product including an added liquid and process for making same |
US20040256058A1 (en) * | 2003-06-19 | 2004-12-23 | Irwin Jere F. | Bag seal machine having repositionable seal bar anvil |
US20040256373A1 (en) * | 2003-06-19 | 2004-12-23 | Irwin Jere F. | Heat seal apparatus, bag machine, and bag edge forming apparatus |
US7273629B2 (en) | 2000-11-28 | 2007-09-25 | Cryovac, Inc. | Meat package with reduced leaker rates |
US20210347128A1 (en) * | 2018-09-19 | 2021-11-11 | Profol GmbH | Tool for applying a film |
-
1970
- 1970-09-08 US US3673041D patent/US3673041A/en not_active Expired - Lifetime
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3845606A (en) * | 1972-11-08 | 1974-11-05 | D Wilson | Package sealing in steam atmosphere |
US3830681A (en) * | 1972-11-08 | 1974-08-20 | Fmc Corp | Package sealing in steam atmosphere |
US3960636A (en) * | 1974-06-19 | 1976-06-01 | Mobil Oil Corporation | Method and apparatus for the production of shear seals in thermoplastic materials |
US4067175A (en) * | 1976-08-04 | 1978-01-10 | Isaac Vinokur | Device for sealing containers made of heat-sealable material |
US4379008A (en) * | 1979-03-03 | 1983-04-05 | Ab Akerlund & Rausing | Method and apparatus for sealing cardboard containers |
US4262708A (en) * | 1979-09-14 | 1981-04-21 | Reynolds Metals Company | Method and apparatus for treating flexible containers |
US4369611A (en) * | 1980-07-07 | 1983-01-25 | Rexham Corporation | Top heat sealing unit for pouches |
EP0076966A1 (en) * | 1981-10-08 | 1983-04-20 | Ab Tetra Pak | A method and an arrangement for the heat-sealing of packing laminate |
EP0077756A1 (en) * | 1981-10-19 | 1983-04-27 | Schweizerische Aluminium Ag | Apparatus for closing filled containers |
DE3141898A1 (en) * | 1981-10-22 | 1983-05-11 | Schweizerische Aluminium AG, 3965 Chippis | Sealing process, in particular heat-sealing process and apparatus for closing filled containers |
US4555293A (en) * | 1983-07-26 | 1985-11-26 | French Robert C | Method and apparatus for thermo-bonding seams in thermoplastic material |
US4549388A (en) * | 1983-09-13 | 1985-10-29 | Lantech, Inc. | Package sealing apparatus |
US4770295A (en) * | 1983-09-15 | 1988-09-13 | Baxter Travenol Laboratories, Inc. | Selectively openable seal line and containers having same |
WO1985001268A1 (en) * | 1983-09-15 | 1985-03-28 | Baxter Travenol Laboratories, Inc. | Compartment mixing container having breakable connection between compartments |
US4672793A (en) * | 1984-01-06 | 1987-06-16 | W. R. Grace & Co. | Molded meat vacuum packaging |
US4925687A (en) * | 1988-08-08 | 1990-05-15 | W. R. Grace & Co.-Conn. | Turkey package |
US4961302A (en) * | 1989-05-30 | 1990-10-09 | W. A. Lane Inc. | Sealing bars having asymmetrical sealing surfaces |
US5484001A (en) * | 1993-06-15 | 1996-01-16 | W. R. Grace & Co.-Conn | Method for application of smoke color to inside of bag and apparatus therefor |
US5514400A (en) * | 1993-06-15 | 1996-05-07 | W. R. Grace & Co.-Conn. | Method for application of smoke color to inside of bag |
EP0730946A2 (en) * | 1995-03-08 | 1996-09-11 | Shikoku Kakoki Co., Ltd. | Heat-sealing device for liquid-filled tube |
EP0730946A3 (en) * | 1995-03-08 | 1998-11-25 | Shikoku Kakoki Co., Ltd. | Heat-sealing device for liquid-filled tube |
US6372274B2 (en) * | 1998-06-22 | 2002-04-16 | Cryovac, Inc. | Process for making a packaged product |
AU762118B2 (en) * | 1998-06-22 | 2003-06-19 | Cryovac, Inc. | Packaged food product including an added liquid and process for making same |
US6395321B1 (en) * | 1999-06-01 | 2002-05-28 | Schreiber Foods, Inc | Process for sealing food products such as processed cheese slices |
US7273629B2 (en) | 2000-11-28 | 2007-09-25 | Cryovac, Inc. | Meat package with reduced leaker rates |
US20080026117A1 (en) * | 2000-11-28 | 2008-01-31 | Wofford George D | Packaging product, process for making same, and product made therefrom |
US8012520B2 (en) | 2000-11-28 | 2011-09-06 | Cryovac, Inc. | Packaging product, process for making same, and product made therefrom |
US20040256058A1 (en) * | 2003-06-19 | 2004-12-23 | Irwin Jere F. | Bag seal machine having repositionable seal bar anvil |
US20040256373A1 (en) * | 2003-06-19 | 2004-12-23 | Irwin Jere F. | Heat seal apparatus, bag machine, and bag edge forming apparatus |
US7262389B2 (en) * | 2003-06-19 | 2007-08-28 | Jere F. Irwin | Heat seal apparatus, bag machine, and bag edge forming apparatus with resilient tubular anvil |
US20210347128A1 (en) * | 2018-09-19 | 2021-11-11 | Profol GmbH | Tool for applying a film |
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