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WO1993008982A2 - Rouleau de materiau permettant de fabriquer des sachets refermables hermetiquement et sachets refermables ainsi fabriques - Google Patents

Rouleau de materiau permettant de fabriquer des sachets refermables hermetiquement et sachets refermables ainsi fabriques Download PDF

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Publication number
WO1993008982A2
WO1993008982A2 PCT/US1992/009499 US9209499W WO9308982A2 WO 1993008982 A2 WO1993008982 A2 WO 1993008982A2 US 9209499 W US9209499 W US 9209499W WO 9308982 A2 WO9308982 A2 WO 9308982A2
Authority
WO
WIPO (PCT)
Prior art keywords
pressure sensitive
sensitive material
mils
roll stock
heat sealable
Prior art date
Application number
PCT/US1992/009499
Other languages
English (en)
Other versions
WO1993008982A3 (fr
Inventor
G. Barton Borland
Original Assignee
Packaging Industries, Inc.
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
Application filed by Packaging Industries, Inc. filed Critical Packaging Industries, Inc.
Publication of WO1993008982A2 publication Critical patent/WO1993008982A2/fr
Publication of WO1993008982A3 publication Critical patent/WO1993008982A3/fr

Links

Classifications

    • 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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C65/76—Making non-permanent or releasable joints
    • 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
    • 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
    • B29C66/13—Single 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
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5855—Peelable seals
    • 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
    • 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
    • B29C66/13—Single 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
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents

Definitions

  • the present invention relates to laminated packaging material for forming bags for food products and, more particularly, to a roll stock of such material from which resealable bags can be made, a method of processing the roll stock to enable such bags to be made, and a resealable bag so formed.
  • Most flexible packaging for food products is formed in a relatively continuous manner by machines which fill the packages with the food product at the same time the packages are formed.
  • These machines are called “form, fill and seal” machines and the flexible packaging material typically is a laminant having a layer of a heat sealable material, e-g-, polyethylene, on one surface of the same.
  • the form, fill and seal machine wraps a web of the packaging material around a forming mandrel with the edges of the web overlapping. These edges are sealed together to form, what is referred to in the art, a fin seal which extends lengthwise of a bag tube, i.e., a tube from which individual bags are made.
  • the food product desired to be packaged is placed in the bag tube so formed.
  • An upper seal is then made to close the tube bag's mouth.
  • the finished bag is cut from the tube.
  • U.S. Patent No. 4,786,190 provides a bag design for resealing - a design, however, which cannot be made from roll stock to be used on standard form and fill machinery. That is, although this bag design includes both a pressure sensitive adhesive and a destructible heat seal at the bag mouth, the bag itself is formed simply by heat sealing the edges of one or two separate sheets together, a bag design which is foreign to use with standard form. fill and seal machines. The presence of the exposed pressure sensitive adhesive will interfere with the formation, filling and sealing operation, even if the bag design otherwise was adaptable to use by standard form, fill and sealing machinery. If roll stock for this bag design was made, adjacent sheets of the roll stock will stick together.
  • the present invention provides a roll stock of flexible packaging material from which resealable bags for food products can be made economically with standard form and fill machinery.
  • the invention is a roll stock of flexible packaging material which not only includes a substrate as is usual, but a pressure sensitive material at discrete locations to provide closures in bags, such as bag mouths, made from such roll stock.
  • a non- pressure sensitive material is also included as part of the roll stock covering the pressure sensitive material to render the same inoperative during subsequent utilization of the roll stock.
  • the non-pressure sensitive material is a heat sealable material, such as polyethylene, ethylene/vinyl acetate copolymers or certain ionomers such as Dupont's SURLYNTM.
  • the covering material has a dual function - it not only covers the pressure sensitive material, it enables a standard heat seal to be formed at the bag mouth at the same location as the pressure sensitive material.
  • means for forming two different seals are provided at discrete locations on the roll stock, e.g., the locations desired for bag mouths, means for forming an initial heat seal and means for forming a subsequent pressure sensitive seal.
  • the thickness of the heat sealable material at the location at which it covers the pressure sensitive material is selected so that when a heat seal formed by the same is destroyed, the pressure sensitive material will be exposed for forming a subsequent seal at the desired location.
  • the consumer after the initial heat seal is broken in order to have access to the food product, can reseal the bag mouth with use of the pressure sensitive material.
  • the pressure sensitive material is provided in a pattern on the roll stock in the preferred arrangement to provide the closures in bags made therefrom at the discrete locations, e.g., at the locations for bag mouths. Other areas of the laminated packaging material at which it may be desired to form heat seals is maintained free of the pressure sensitive material in order to assure that it does not interfere with desired strong heat seals.
  • the pattern is applied to a layer of the heat sealable material which is first applied to the substrate, and a subsequent layer of the heat sealable material is applied over the full surface area of the substrate.
  • the result of this construction is that the pressure sensitive material is embedded in heat sealable material.
  • the heat sealable material can be used to form the standard heat seals on a form and fill machine. The heat seal formed at the location of the pressure sensitive material, though, will not have as much heat sealable material involved in the seal as is typical. When the seal is destroyed, the pressure sensitive material will be exposed as discussed above to enable subsequent sealing at its location.
  • the invention includes not only the roll stock, but a method of processing roll stock to provide the pressure sensitive material and the resulting bag.
  • FIG. 1 is a plan view of a piece of a preferred embodiment of flexible packaging roll stock conforming to the invention
  • FIG. 2 is an enlarged partial sectional view showing the various layers of such preferred embodiment
  • FIG. 3 is a schematic, side elevation view of apparatus for* processing roll stock in accordance with the invention.
  • FIG. 4 is a generally schematic perspective view of standard form and fill machinery, forming bags from roll stock of the invention
  • FIG. 5 is a perspective schematic view of a bag conforming to the instant invention.
  • FIGS. 6 and 7 are enlarged schematic sectional views of a bag mouth illustrating the bag mouth with a heat seal enclosure that respectively is intact and destroyed in order to expose pressure sensitive material for resealing.
  • a bag generally referred to by the reference numeral 11, of flexible packaging material includes, as is usual, a pair of upper and lower opposed side walls 12 and 13.
  • the bag is formed from a tube of flexible packaging material roll stock. It includes a longitudinal fin seal 14 formed by heat sealing together overlapping edges of the roll stock. It also includes a bottom heat seal 16 which is transverse to the fin seal. The bottom seal has to be sufficiently strong to withstand the weight of the food product against the same, as well as movement of the same such as will be discussed.
  • the upper end of the bag i.e., the bag mouth
  • a heat seal 17 is also closed with a heat seal 17.
  • a pattern of a pressure sensitive material 18 is embedded within the heat sealable material 17 at the bag mouth to be exposed when the former is destroyed by the consumer for initial access to the bag's interior.
  • the thickness of the heat sealable material covering the pressure sensitive strip is selected so that when the heat seal formed by the same is destroyed, the pressure sensitive material is exposed for forming a subsequent seal at the mouth.
  • the thickness which is actually selected depends in large part on the materials involved and the weight, etc. , of the food product to be packaged. In general, though, the thickness that is selected should be within the range of between about 0.2 mils and about 0.7 mils.
  • FIGS. 6 and 7 show operation of the seal.
  • FIG. 6 illustrates the heat seal that is formed at the bag's mouth
  • FIG. 7 illustrates that when the heat seal is broken, the pressure sensitive material will be exposed.
  • the pressure sensitive material is provided at the location at which it is desired to operate, but not at the other locations at which there is to be a heat seal, such as at the location for the bottom seal, a location at which a strong heat seal is to be provided.
  • a location at which a strong heat seal is to be provided For example, if pressure sensitive material was sandwiched between the heat sealable material layers at the location of the bottom seal, there would be a loss in hot tack resulting in product dropping through the bottom seal while the same is molten.
  • FIG. 1 A piece 21 of the roll stock from which the resealable bag is made is illustrated in FIG. 1.
  • roll stock for forming a single bag tube is illustrated, as a practical matter the operations described relative to FIG. 3 form wider roll stock designed for a multiple number of bag tubes.
  • the wider roll stock so formed is then cut into the narrower roll stock illustrated for forming individual bag tubes.
  • Such roll stock is a la inant made up of a substrate 22 (FIG. 2) such as a metal foil, a polyester, or a cellophane, as is standard practice in the industry.
  • the substrate is selected to be thermally stable if it is to be resistant to heat applied thereto such as to provide the heat sealing to be described below.
  • the substrate includes on one surface, an ink pattern represented at 23 which provides advertising, product identification, etc.
  • a primer or adhesive layer 25 is also provided between the polyethylene layer and the ink to assure good adhesion.
  • the layer 24 in this preferred embodiment is polyethylene, insofar as the broad concepts of the invention is concerned the layer 24 could be of any heat sealable material.
  • a pattern of a pressure sensitive material is provided on layer 24 at those discrete locations for bag mouths or other bag closures.
  • the Ribbon Coater available from Graco/LTI of Monterey, California, can be used to provide the desired pattern. Acumeter of Marlborough, Massachusetts also provides a suitable ribbon coater.
  • the printing on the substrate includes "eye spots" 26 which are sensed as will be discussed hereinafter to control the application of pressure sensitive material as the desired pattern.
  • This pattern in the preferred embodiment is made up of strips 27 indicated in FIG. l. Each of the strips has a thickness in the range of between about .5 mils and about 1.5 mils. Its thickness is preferably 1.0 mils.
  • the printing also can include a locating strip 28 or the like to facilitate finding the pressure sensitive strips 27.
  • Another layer 29 of polyethylene or other heat sealable material is provided over the full surface area of the roll stock to cover the pattern formed by the strips 27.
  • This covering layer should have the characteristics necessary for the material to be compatible with the form, fill and seal machinery with which it is to be used. For example, it should have both slip and hot tack characteristics.
  • a slip concentrate is added to the polyethylene to provide a low enough coefficient of a friction to enable the packaging material to slide over the metal parts of such machinery. "Hot tack" is inherent in the polyethylene resin and comes into play when a food product is dropped into the bag while the bottom seal is still molten - inadequate hot tack causes the product to drop through the bottom seal.
  • layer 29 covers the full surface area of the roll stock
  • two separate heads could be used, one applying a pattern of the pressure sensitive material and the other applying a pattern of heat sealable material only on those locations having the heat seal material.
  • a single pattern applicator could be used to apply both of the materials in the proper order at the same time.
  • a tape with the heat sealable material and the pressure sensitive material could be applied at the discrete locations.
  • the strips 27 are embedded in heat sealable material, i.e., between the layers 24 and 29.
  • the material of the layers 24 and 29 are the same or otherwise compatible with one another so that they combine for heat sealing purposes at those locations not having the strips 27. It is common to provide a film or layer comparable to layer 24 for heat sealing purposes. In this instance the thickness of the layer 24 can be reduced in view of the layer 29 if the bag otherwise has sufficient strength to prevent tearing.
  • the layer 29 renders the strips 27 inoperative until such time as the heat seal at their location is broken.
  • the heat seal which will be formed as discussed below at the bag mouth or other closure will be provided at the location of the strip 27 only by the heat sealable material covering such strip. (Of course, the other wall of a bag will not have the pressure sensitive strip of material.)
  • This heat sealable material is most simply polyethylene having a thickness covering the strips 27 in the range of about 0.2 mils to p.7 mils, preferably 0.4 mils.
  • the substrate was cellophane having a thickness of about 0.8 mils
  • the layer 24 was polyethylene having a thickness of about 1.25 mils adhered to the cellophane by a thickness of about .1 mil of adhesive
  • each of the pressure sensitive strips had a thickness of about 1.5 mils
  • the covering layer was also polyethylene having a thickness of about 0.6 mils.
  • the pressure sensitive material was provided as a hot melt by H. B. Fuller of St. Paul, Minnesota, sold with the designation H.L.-2115-X. H. B. Fuller has other hot melts which can be used.
  • Other appropriate melt pressure sensitive adhesives are sold by Swift Adhesive of Downers Grove, Illinois, and by National Starch of Bridgewater, New Jersey.
  • packaging material is described as having a particular order of materials, the use of the terms "in order" here and in the claims is not meant to require that each of the layers which is described be immediately adjacent other layers in the order. There can be intermediate layers in accordance with standard practice.
  • FIG. 3 is a simplified diagrammatic view of those aspects of a flexible packaging processing apparatus relevant to the instant invention.
  • a roll of a substrate (not shown) is unwound in a continuous manner to provide a web 31 of the same.
  • Printing is applied to such substrate in accordance with conventional practice to form the printing 23. (This process is not shown.
  • the substrate with the printing thereon is then primed for application of polyethylene as will be described.
  • This priming operation is also conventional and not shown.
  • the printed substrate is primed, it is passed through a station at which a film of polyethylene or other heat sealable material is extruded as a melt via extruder 32 onto the same as it passes through the nip of a chill roll 33 and a pinch roll 34.
  • a chilled back-up roll 36 is provided to cool pinch roll 34.
  • the film is at least partially solidified to form the layer 29 at the nip previously described. It then passes about chill roll 33 to complete sufficient solidification for the remainder of the process.
  • the web is then passed by an electric eye represented at 37 which detects the locations of the eye spots 26 to control operation of patterning equipment for applying the pattern of pressure sensitive material to the web.
  • a signal indicative of the presence of an eye spot is transmitted as represented by line 38 to a pattern controller 39 which controls the operation of solenoid valves represented at 41 for a coating head 42 for applying the pattern of heat sealable material to the web.
  • a Ribbon Coater from Graco/LTI of Monterey, California, was used as the coating head.
  • a supply of the pressure sensitive material in hot melt form is contained in a reservoir in a hot melt delivery system represented at 43.
  • the pressure sensitive material in melt form is delivered via a heated hose 44 to the head 42.
  • the strips 27 will be deposited on the web at the desired discrete locations on the layer 24.
  • the covering layer 29 of the heat sealable material is then applied. It is applied over the full surface of the web. This provides a non-stick, heat sealable surface with adequate slip and hot tack to operate on the selected form, fill and seal machinery.
  • the application of the same at the nip between a chill roll 47 and a pinch roll 48 is represented by the showing of the extruder 46.
  • a back-up chill roll 49 for the pinch roll is also illustrated.
  • the web is completed with any other processing steps desired and then formed into a roll 51 in accordance with conventional practice.
  • FIG. 4 is a simplified schematic perspective view of a standard form, fill and machine utilizing roll stock of the invention.
  • the roll stock represented by reference numeral 51, is unwound to form a web 52 which after passing about and through various rollers in accordance with conventional practice is wrapped around a mandrel 53 to form a tube 54.
  • the overlapping edges of the material are heat sealed together by a standard mechanism represented by the blocks 56.
  • the tube is advanced along the mandrel by conventional apparatus represented by the belts 57.
  • the tube is heat sealed transverse to the fin seal as is represented by blocks 58 to form the bottom seal of a tube bag.
  • the food product desired to be packaged is.fed into the tube bag through the mandrel as is represented by the hopper 59 shown in dotted lines.
  • the upper end of the bag is then sealed to enclose the food product, and the completed bag is severed from the remainder of the tube.
  • These operations also are accomplished by the blocks represented at 58.
  • the bottom seal for the next tube bag is formed simultaneously with the formation of the bag upper seal and the severing, to form a free bag.
  • operation of the form, fill and seal machine is oblivious of the fact that the roll stock includes an embedded heat sealable material at the location of the mouth of the completed bags.
  • the blocks 59 form a heat seal in the standard manner.
  • the completed bag includes the heat seal strip at the bag mouth as discussed previously.
  • the bag closure having the pressure sensitive material need not necessarily be the bag's mouth.
  • the invention is applicable to providing covered pressure sensitive material at any location(s) at which resealing of a bag penetration may be desired.
  • the pressure sensitive material and the covering/heat sealable material can be provided together as a tape, with or without an appropriate backing. Such a tape could be, for example, applied to the edge of the roll stock as it is unrolled into the web to provide a bag closure at the fin seal of bags.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Wrappers (AREA)
  • Bag Frames (AREA)

Abstract

On décrit un rouleau d'un matériau d'emballage souple destiné à la fabrication de sachets pour denrées alimentaires, sachets que l'on peut refermer hermétiquement alors qu'on les produit avec des machines classiques de formage et de remplissage. Ce rouleau (21) comporte des points de repère (26) permettant de régler l'application d'un matériau auto-adhésiv (27), et des bandes de repère (28) facilitant le repérage des bandes auto-adhésives (27) placées aux endroits distincts correspondants aux ouvertures des sachets. L'invention concerne aussi le sachet provenant de ce rouleau ainsi que le procédé utilisé pour que ce dernier fournisse la possibilité de refermer hermétiquement les sachets ainsi fabriqués.
PCT/US1992/009499 1991-11-08 1992-11-06 Rouleau de materiau permettant de fabriquer des sachets refermables hermetiquement et sachets refermables ainsi fabriques WO1993008982A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US79064791A 1991-11-08 1991-11-08
US790,647 1991-11-08

Publications (2)

Publication Number Publication Date
WO1993008982A2 true WO1993008982A2 (fr) 1993-05-13
WO1993008982A3 WO1993008982A3 (fr) 1993-06-10

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PCT/US1992/009499 WO1993008982A2 (fr) 1991-11-08 1992-11-06 Rouleau de materiau permettant de fabriquer des sachets refermables hermetiquement et sachets refermables ainsi fabriques

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Country Link
WO (1) WO1993008982A2 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19504062A1 (de) * 1995-02-08 1996-08-14 Rovema Gmbh Beutel mit einer Produktentnahmeöffnung und einer die Produktentnahmeöffnung verschließenden Verschlußfolie und Verfahren zur Herstellung des Beutels
FR2783512A1 (fr) 1998-09-18 2000-03-24 Soplaril Sa Emballage pouvant etre referme apres ouverture, en particulier sac en matiere plastique, et procede de fabrication d'un tel emballage
EP0868368B1 (fr) * 1995-11-29 2001-01-10 Soplaril Structure d'obturation pour un contenant
FR2798119A1 (fr) * 1999-07-16 2001-03-09 Brodart Enveloppe souple pour le conditionnement de produits notamment alimentaires, issue d'une feuille de grande longueur et possedant des moyens de refermeture et de reouverture repetitives
FR2801285A1 (fr) * 1999-11-23 2001-05-25 Danisco Flexible France Sachet d'emballage
GB2363107A (en) * 2000-08-25 2001-12-12 Dairygold Technologies Ltd Easily opened package
EP1167220A3 (fr) * 2000-06-18 2006-12-27 Sonoco Development, Inc. Emballage refermable et son procédé de fabrication
EP1586510A4 (fr) * 2002-12-17 2008-07-23 Ishida Seisakusho Bande formant un presentoire
US7476441B2 (en) 2002-08-30 2009-01-13 Ishida Co., Ltd. Display strip and display strip and product assembly
US7588813B2 (en) 2004-10-26 2009-09-15 Ishida Co., Ltd. Display strip and a display strip and product assembly
US7651290B2 (en) 2005-05-09 2010-01-26 Kimberly-Clark Worldwide, Inc. Device with pull tab activation
US7950864B2 (en) 2005-12-13 2011-05-31 Kimberly-Clark Worldwide, Inc. Device with internal pull tab activation
US8435613B2 (en) 2002-08-30 2013-05-07 Ishida Co., Ltd. Display strip

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785940A (en) * 1987-07-02 1988-11-22 Minnesota Mining And Manufacturing Company Flexible bag with a pressure sensitive adhesive closure strip
US5089320A (en) * 1989-01-09 1992-02-18 James River Ii, Inc. Resealable packaging material

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19504062C2 (de) * 1995-02-08 1998-06-04 Rovema Gmbh Beutel mit einer Produktentnahmeöffnung und einer die Produktentnahmeöffnung verschließenden Verschlußfolie und Verfahren zur Herstellung des Beutels
DE19504062A1 (de) * 1995-02-08 1996-08-14 Rovema Gmbh Beutel mit einer Produktentnahmeöffnung und einer die Produktentnahmeöffnung verschließenden Verschlußfolie und Verfahren zur Herstellung des Beutels
EP1074482B1 (fr) * 1995-11-29 2003-12-17 Soplaril Sa Structure d'obturation pour un contenant
EP0868368B1 (fr) * 1995-11-29 2001-01-10 Soplaril Structure d'obturation pour un contenant
US6302290B1 (en) 1995-11-29 2001-10-16 Atofina Container sealing assembly
FR2783512A1 (fr) 1998-09-18 2000-03-24 Soplaril Sa Emballage pouvant etre referme apres ouverture, en particulier sac en matiere plastique, et procede de fabrication d'un tel emballage
FR2798119A1 (fr) * 1999-07-16 2001-03-09 Brodart Enveloppe souple pour le conditionnement de produits notamment alimentaires, issue d'une feuille de grande longueur et possedant des moyens de refermeture et de reouverture repetitives
FR2801285A1 (fr) * 1999-11-23 2001-05-25 Danisco Flexible France Sachet d'emballage
EP1167220A3 (fr) * 2000-06-18 2006-12-27 Sonoco Development, Inc. Emballage refermable et son procédé de fabrication
GB2366277A (en) * 2000-08-25 2002-03-06 Dairygold Technologies Ltd Readily-opened food package
GB2363107A (en) * 2000-08-25 2001-12-12 Dairygold Technologies Ltd Easily opened package
US7476441B2 (en) 2002-08-30 2009-01-13 Ishida Co., Ltd. Display strip and display strip and product assembly
US8435613B2 (en) 2002-08-30 2013-05-07 Ishida Co., Ltd. Display strip
EP1586510A4 (fr) * 2002-12-17 2008-07-23 Ishida Seisakusho Bande formant un presentoire
US7629044B2 (en) 2002-12-17 2009-12-08 Ishida Co., Ltd. Display strip
US7588813B2 (en) 2004-10-26 2009-09-15 Ishida Co., Ltd. Display strip and a display strip and product assembly
US7651290B2 (en) 2005-05-09 2010-01-26 Kimberly-Clark Worldwide, Inc. Device with pull tab activation
US7950864B2 (en) 2005-12-13 2011-05-31 Kimberly-Clark Worldwide, Inc. Device with internal pull tab activation

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