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WO2011143708A1 - Paquet et procédé - Google Patents

Paquet et procédé Download PDF

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Publication number
WO2011143708A1
WO2011143708A1 PCT/AU2011/000589 AU2011000589W WO2011143708A1 WO 2011143708 A1 WO2011143708 A1 WO 2011143708A1 AU 2011000589 W AU2011000589 W AU 2011000589W WO 2011143708 A1 WO2011143708 A1 WO 2011143708A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
regions
sections
substrate
process according
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.)
Ceased
Application number
PCT/AU2011/000589
Other languages
English (en)
Inventor
Danny Smith
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.)
Amcor Pty Ltd
Original Assignee
Amcor Pty Ltd
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 claimed from AU2010902196A external-priority patent/AU2010902196A0/en
Application filed by Amcor Pty Ltd filed Critical Amcor Pty Ltd
Priority to AU2011256139A priority Critical patent/AU2011256139B2/en
Publication of WO2011143708A1 publication Critical patent/WO2011143708A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B65B51/02—Applying adhesives or sealing liquids
    • B65B51/026—Applying adhesives or sealing liquids using rotating applicators
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining 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 way of applying the adhesive
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining 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 way of applying the adhesive
    • B29C65/526—Joining 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 way of applying the adhesive by printing or by transfer from the surfaces of elements carrying the adhesive, e.g. using brushes, pads, rollers, stencils or silk screens
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular 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
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/234—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being in the form of tessellations
    • 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
    • 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
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/06—Wrapping articles, or quantities of material, by conveying wrapper and contents in common defined paths
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining 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
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining 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
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining 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 way of applying the adhesive
    • B29C65/522—Joining 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 way of applying the adhesive by spraying, e.g. by flame spraying
    • 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
    • B29C66/7232—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 comprising a non-plastics layer
    • B29C66/72321—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 comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • B29C66/7232—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 comprising a non-plastics layer
    • B29C66/72327—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 comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper

Definitions

  • the present invention relates to a package for a product such as food and a process for making seams of the package.
  • a type of package that is widely used for snack bars and other convenience foods is a satchel comprising a polymeric wrapper that is resistant to air and moisture ingress so as to maintain its contents fresh and unspoilt for an extended period.
  • the wrapper is folded about the food item so that lengthwise sections of the wrapper are overlaid and sealed together to form a longitudinal seam, and similarly, widthwise sections of the wrapper are overlaid and sealed at opposite ends of the food item to form end seams to totally enclose the item in a sealed satchel.
  • the longitudinal seam and end seams may be sealed by heat and pressure welding or, alternatively, by a glue. In the case where the glue has been employed, a homogeneous coating of glue of uniform thickness and typically width is applied to the surfaces of the wrapper to be sealed together.
  • the cost of packaging food items is dependent on range of variables including the amount of polymeric wrapper used, and in the case where the seams are formed using a glue, the consumption of glue.
  • a reduction in the amount of adhesive applied to form a seam may be limited by the need to apply a prescribed amount of glue.
  • the resulting glue thickness may be insufficient to form a sufficient bond.
  • Satchel type packaging is used for many other products besides convenience foods.
  • satchel type packaging made from polymeric materials is used for dried foods and even non-food items such as components and consumer products.
  • adjacent surfaces of polymeric package are adhered together by one of two common techniques. The first technique is to 'weld' the adjacent surfaces together by the application of heat where the adjacent surfaces are joined. The second technique is to use an adhesive as described in this specification.
  • adhesives are used to join together other types of materials, for example paper based packaging, and even items of steel in some industrial applications such as carmaking. A common feature of these applications is that a seam is formed to join together adjacent surfaces.
  • the present invention is based on the realisation that it is possible to reduce the amount of adhesive required to form a sealed seam by applying adhesive nonuniform ⁇ to surfaces to be joined together during a manufacturing process.
  • the present invention relates to a process including the steps of:
  • step a) placing together the sections of the substrate to which the adhesive has been applied in step a) to form a sealed seam of a package.
  • the sealed seam may form part of the seams of a package for a product.
  • Step a) may include applying the adhesive non-uniformly to the sections that are adhered together, in which the adhesive is applied to the first regions of each section in an amount so that the first regions of the different sections can adhere together to form a sealed seam, and adhesive is applied to the second regions of each section in an amount that is less than the amount applied to the first regions.
  • the adhesive may be applied so that the first and second regions are present on each of the sections that are intended to be sealed together.
  • step a) may include applying the adhesive to a first section of the substrate having the first and second regions, while adhesive is applied uniformly or without the first and sections regions to another section that joined in step b) with the first section.
  • the adhesive may be applied at a covering to the other section at a loading that equal or is greater than the loading applied to the first region.
  • the adhesive is applied at a coverage of mass per unit area.
  • Adhesive applied to the substrate suitably forms a perimeter about an inner area of the substrate that is free of adhesive for contacting a product contained by the substrate.
  • the perimeter of adhesive defining the inner area may be partly or completely formed by the sections of adhesive applied according to step a).
  • the substrate may include a series of segments for forming separable packages, and in which case step a) may include applying the sections of adhesive about an inner area of each segment that is free of adhesive for contacting the product.
  • the sections of adhesive may be applied to peripheral areas and peripheral sections of the segments. Although the sections of adhesive may be applied to only part of the peripheral areas of the segments, suitably, the sections of adhesive applied according to step a) extend about an entire peripheral area of the segments.
  • a package such as a satchel is able to be formed by placing together the sections of adhesive about the peripheral area of the substrate to form a closed satchel.
  • the substrate may be a continuous roll of the substrate and the adhesive is applied to the substrate to form a line of segments on the substrate, each segment includes the sections of adhesive having the first and second regions applied according to step a) which can be placed together to form a sealed seam.
  • the adhesive is applied to the substrate after the substrate has been unwound from the roll.
  • the process may include a pre-treatment step in which the substrate is exposed to a plasma treatment including a corona treatment prior to the applying the adhesive.
  • the purpose of the pre-treatment step is to increase the surface energy and, in turn, the strength of the bond of the adhesive to the substrate.
  • the process may include severing the segments from the continuous roll of the substrate, and suitably severing the segments consecutively one after the other.
  • the segments may be interconnected by preformed frangible lines of the weakness which are severed after the adhesive has been applied according to step a).
  • the segments may be severed by cutting the substrate.
  • the severing step is carried out after the adhesive has been applied to the segments.
  • step a) involves applying the adhesive to the first regions only, and without applying adhesive to second regions.
  • adhesive is not applied to the second region during step a).
  • the first regions may be referred to as applied regions and the second regions may be referred to as blank regions.
  • the first regions cover at least 50% of the area of the section(s), and even more suitably at least 60% or 70% of the area of the section(s), and yet even more suitably at least 75% of the area of the section(s).
  • the second regions occupy the remaining area of the section(s) of the substrate.
  • the sections may include other regions at which the adhesive is applied in amounts greater or less than the amounts applied to the first or second regions.
  • adhesive may be applied to the first region in a minimum amount to form a sealed seam, adhesive may be applied to the second region in an amount less than the amount applied to the first regions and adhesive may not be applied to a third region of the sections.
  • the adhesive is applied to the first sections at an amount as recommended by the supplier of the adhesive to suit the substrate and other manufacturing conditions.
  • the adhesive may be applied to the first regions at an amount of at least 2.5 gm/m 2 .
  • the adhesive is applied to the first regions at an amount of at least 3.0 gm/m 2 or suitably in an amount of at least 3.5 gm/m 2 .
  • the adhesive may be applied to the first regions in an amount from 2.5 to 5.0 gm/m 2 and suitably from 3.0 to 4.0 gm/m 2 . It will be appreciated that the amount of the adhesive applied to the first regions will depend on factors such as the types of the adhesive and the properties of the substrate including the strength of adhesion to the substrates. It therefore follows that other amounts of the adhesive may be sufficient to achieve an adequate seal.
  • step b) may include applying pressure to the sections of the substrate that have been placed together, and while applying pressure, it is possible that the adhesive may spread from the first regions to the second regions.
  • the adhesive may, prior to setting, having a relative low viscosity, which allows the adhesive to spread or run prior to, or after, the sections of the substrate have been placed together.
  • Step b) may include aligning the first regions of the sections so that the first regions register in an overlaid relationship so as to form a seal therebetween.
  • packaging machinery will be unable to function at the tolerances necessary to align the first regions of different sections.
  • the adhesive may be applied in step a) so that the first and second regions form patterns of adhesive applied to the substrate.
  • the second region may be areas that define a pattern that is adhesive free, and the first region may be defined by areas in which the adhesive is applied in a pattern.
  • Step a) may include applying the adhesive in the first regions of the sections to be joined together in the same pattern.
  • the patterns of adhesive of the first regions of each section may be the same, ideally, the relative positions of the patterns in the sections that are joined together in step b) may be different.
  • adhesive is applied to the first regions of two longitudinal sections of the same configuration of the substrate and are intended to be adhered together such that the first regions of one longitudinal section is at least partially offset relative to the location of the first regions of the other longitudinal section.
  • the first regions of the sections at least partially overlap such that first region of one section overlays the first region and second region of the another section and vice versa.
  • the sections of the substrate are placed together in accordance with step b)
  • a majority of each of the first regions of one section contact with, or adhere to, at least two of the first regions of another section.
  • the first regions of the different sections interconnect with each other when the sections are placed together.
  • the first regions of the different sections interconnect or contact to some extent to form a sealed seam.
  • Step a) may include applying the adhesive in the first regions in a pattern that is asymmetric about an axis of the substrate.
  • the section(s) of the flexible substrate to which the adhesive is applied may be a peripheral section(s) that include, for example,: i) a peripheral lengthwise section that extends along the length of the substrate and ii) peripheral width section(s) that extend along the width of the substrate.
  • the first region may include a pattern of adhesive applied in strips.
  • the adhesive strips may be arranged so as to form ring formations that are arranged in layers.
  • the ring formations may extend about the peripheral sections of the substrate.
  • the ring formations may include closed loop formations or in another variant, the ring formations may be a spiral formation.
  • the second regions may include a pattern of adhesive or a pattern free of the adhesive in strips.
  • the patterns of adhesive of the second region may also include ring formations.
  • the ring formations may extend about peripheral sections of the substrate.
  • the ring formations may also include closed loop formations or in a variant in a spiral formation.
  • the strips of the first and second regions may include linear segments of adhesive.
  • the adhesive pattern of the first and second region may have a non-linear profile.
  • the adhesive pattern of the first and second region may also have linear profile.
  • the pattern of adhesive of the first regions may include the adhesive being applied in dot formations.
  • the dot formations may be isolated from another dot formation by the second region, i.e., the second regions surround each dot formation of adhesive of the first regions.
  • the dot formations may have any geometric shape including circular, quadrangular, rectangular, square, triangular, figure 8, bean or hour glass shapes.
  • the adhesive pattern of the first region may include a semi-continuous or
  • discontinuous coating of the adhesive that extends across the sections and includes a series of isolated second regions that are distributed over the first region.
  • the second regions do not include adhesive.
  • the isolated blank regions include dot formations of any geometric shape including cross formations.
  • the process includes wrapping or folding the substrate about the item being packaged before placing together the sections of the flexible substrate in according with step b).
  • the adhesive may be applied by a variety of padding, inkjet or spraying techniques. However, according to an embodiment, the adhesive is applied using one or more rollers in which the adhesive applied transfers from a roller onto the flexible substrate.
  • the roller may be a lithographic, flexographic or gravure roller.
  • the substrate may be a flexible substrate that can be folded.
  • the flexible substrate used in some embodiments of this invention may be any polymeric film including metallised and non-metallised polymeric films, or paper pulp substrates including paper, cardboard, corrugated board.
  • the flexible substrate may also have a laminated structure including both polymeric and paper based materials laminated together.
  • the substrate may also be a roll of continuous web, for instance a web that is fed continuously between a roller applying adhesive to the substrate and a backing roll.
  • the flexible substrate may also be in the form of separate sheets that are fed sheet-by- sheet.
  • the adhesive may be any form of adhesive including cold glue, hot glue, and two part glues such as epoxy glues.
  • the adhesive may be applied so that the first and second regions are present on each of the sections that form longitudinal seams of the package.
  • the adhesive may also be applied so that the first and second regions are present on each of the sections that form non-longitudinal seams or end seams of the package.
  • the present invention may relate to a process for packaging an item such as food and other perishable items, the process including the steps of: a) applying an adhesive to sections of the flexible substrate, wherein the adhesive is non-unifomnly distributed so that there are applied regions within the sections to which the adhesive is applied, and blank regions within the sections without the adhesive; and b) placing together the sections of the substrate to which the adhesive has been applied in step a) to form a sealed seam.
  • the present invention also relates to a package for food and other perishable items, the package including a flexible substrate and an adhesive applied to two or more sections of the substrate which, when the substrate is wrapped about the item, adhere together to form a closed seam, wherein the adhesive is applied to at least one of the sections so that there are:
  • the first and second regions as described in the paragraph immediately above may be present when adhesive is initially applied to the substrate, and thereafter merged together.
  • the first and second regions may also exist when the adhesive has set.
  • the present invention also relates to a package for food and other perishable items, the package including a flexible substrate and an adhesive applied to two or more sections of the substrate which, when the substrate is wrapped about the item, adhere together to form a closed seam, wherein the adhesive is distributed over the sections so that there are adhesive regions (that include the applied adhesive) and blank regions within the sections without the adhesive.
  • the package may also include any one or a combination of the features of the process of the present invention described herein. Brief Description Of The Drawings
  • Figures 1 to 9 are plan views of nine separate embodiments of flexible substrates for packaging perishable items. Each figure illustrates a different pattern over which an adhesive has been applied to peripheral sections of the substrates so that the peripheral sections can be placed together to form a satchel having sealed seams.
  • Figure 10 is a block diagram of process steps according to an embodiment of the present invention.
  • Figure 1 1 is schematic illustration of the steps of applying adhesive to a continuous roll of substrate, the adhesive being applied to peripheral areas of segments and severing the segments.
  • Figures 12 and 13 schematically illustrate perspective and end views of a package according to an embodiment of the present invention. Detailed Description
  • the embodiments of the invention depicted in Figures 1 to 9 each comprise a rectangular flexible polymeric substrate 40.
  • the Figures show individual patterns in which an adhesive is applied to the inner surface of the substrate in a non-uniform or non-homogeneous coating.
  • the adhesive is applied in the sections having first regions at which the adhesive is applied in a required amount so that two of the first regions can adhere together to form a seal, and second regions at which the adhesive is applied in an amount that is less than the amount applied at the first regions.
  • the first regions comprise patterns of adhesive shown in the lines and dots, and the second regions comprise blank regions without adhesive.
  • the adhesive is applied along peripheral sections, and specifically to lengthwise peripheral sections, identified by reference numeral 10 in Figure 1 , and widthwise peripheral sections at the ends of the substrate identified by reference numeral 20 in Figure 2.
  • An inner edge of the widthwise sections 20 include inwardly facing peaks and troughs along their length.
  • the adhesive may be any type of adhesive including cold adhesives, hot adhesives and two part or epoxy adhesives.
  • An example of a suitable cold adhesive is sold under the trade name Fullaseal 22/121TM.
  • the Fullaseal 22/121TM adhesive is applied at an amount of 3.5mg/m 2 in regions of the outer peripheral area where the coating is applied.
  • a range of other cold suitable cold adhesives are also available under the trade name Bostik.
  • the pattern of adhesive of the first regions includes dots and a grid or lattice structure 21 .
  • the adhesive is applied in a grid structure comprising sets of linear strips that are arranged
  • the grid structure 21 is also angled to the length of the substrate which includes a series of diamond shaped cells.
  • a diamond shaped dot 22 of adhesive is applied inside each cell so as to from an annular blank region free of adhesive between the dot of adhesive and the blank region.
  • the dots 22 and grid structure 21 suitably comprise an adhesive that has been applied in an amount so that when the substrate is folded and the dots 22 and grid structure 21 contact the adhesive forms a seal. Spaces between the grid structure 21 and the dots 22 are free of adhesive i.e., in this instance form the second regions.
  • the embodiment shown in Figure 2 is essentially the same as the embodiment of Figure 1 , save for two rings of cells 20 being substantially free of the adhesive.
  • the rings of cells extend along lengthwise and widthwise peripheral sections of the substrate.
  • the embodiment shown in Figure 3 comprises a pattern of adhesive in which the first regions are in the form of non-linear strips 23 extending widthwise at the end sections of the substrate.
  • the non-linear strips 23 of adhesive also extend in a widthwise direction along the length of the substrate.
  • the non-linear strips of adhesive are separated by non-linear blank regions 24, i.e., the second regions that are narrower than the adhesive sections.
  • the embodiment shown in Figure 4 comprises an adhesive applied across lengthwise and widthwise peripheral sections 10 and 20 of the substrate.
  • the adhesive is applied as a semi-continuous or discontinuous coating or layer that extends across the sections 10 and 20, and includes a series of isolated blank regions 25 that are distributed over the adhesive material.
  • the isolated blank regions include cross formations 25 from which the adhesive is absent.
  • the embodiment shown in Figure 5 comprises an array of small dot formations 25 of adhesive applied across the lengthwise and widthwise peripheral sections 10 and 20 of the substrate. Each of the dot formations 25 are separated by blank regions that are free of adhesive. As can be seen, the dot formations 25 are evenly and consistently distributed over the sections 10 and 20 of the substrate.
  • the embodiment shown in Figure 6 is similar in concept to the embodiment shown in Figure 5. However, in contrast the embodiment in Figure 6 comprises an array of larger sized dot formations 25 of adhesive applied across the lengthwise and widthwise peripheral sections of the substrate. Each of the dot formations 25 are separated by blank regions that are free of adhesive. As can be seen, the dot formations 25 are evenly and consistently distributed over the sections of the substrate.
  • the embodiment shown in Figure 7 comprises linear strips 26 of adhesive and the linear blank strips 27 without an adhesive that extend lengthwise and widthwise of the peripheral sections.
  • the linear adhesive strips 26 and the blank strips 27 are arranged in consecutive ring formations that form alternating layers of rings of adhesive and rings without adhesive.
  • two or more continuous or discontinuous adhesive strips and blank strips extend along inner portions of the widthwise sections.
  • the embodiment shown in Figure 8 is similar in concept to the embodiment shown in Figure 7 in the sense that both comprise strip of adhesive 26 and blank strips 27 free of adhesive that are arranged in ring formations. However, the embodiment shown in Figure 8 differs from the embodiment of Figure 7 in the sense that width of the adhesive and blanks strips 26 and 27 is significantly narrower than the adhesive and blank strips 26 and 27 shown in Figure 8.
  • the embodiment shown in Figure 9 includes elongated dot formations 21 having a bean or hourglass shape.
  • the dot formations 21 are aligned in the widthwise direction of the substrate 40.
  • the embodiments shown in Figures 1 to 9 are examples in which the adhesive is applied to at least 60% of the area of the peripheral sections 10 and 20, and suitably at least 70% of the area of the peripheral sections 10 and 20.
  • the adhesive is also suitably a cold glue sold under the trade name Fullaseal 22/121 and is applied at an amount of at least 3.5 mg/m 2 .
  • the adhesive applied in this amount enables the regions of adhesive to be adequately adhered together to form regions that are substantially resistant to the ingress of moisture and air.
  • the adhesive is applied in first regions and absent from second regions in the patterns described above.
  • reference numeral 30 that identifies corresponding sectors on opposed sections of the substrate 40 that are intended to be placed together.
  • the layout of the pattern of adhesive and non-adhesive regions is offset for the corresponding sectors.
  • the embodiments shown in Figures 1 and 2 are examples in which the pattern is offset by approximately half the width of the dot 22 or cell.
  • the embodiment shown in Figure 3 is an example in which the patterns are offset by approximately half the width of the non-linear strips 23 for corresponding sector 30.
  • the embodiment shown in Figure 4 is an example in which the patterns are offset by approximately the half the width of each cross formation 25 for corresponding segments.
  • the embodiments shown in Figures 6 and 9 are examples in which the dot and bean formations 21 are again offset in corresponding sections by approximately half the width of the formations 21 .
  • One of the benefits of offsetting the regions of adhesive of sections is that when the sections are placed together a majority of the first regions of adhesive of the separate sections overlap, or at least partially overlap so as to form an array of interconnected regions of adhesive. We have found that can increase impermeability and/or strength of the seal formed.
  • FIG 10 is a block diagram of process steps according to a preferred embodiment of the present invention.
  • the initial step includes applying the adhesive to a sheet of the substrate 40 to define multiple segments, each for forming a package on the sheet.
  • Each segment may have peripheral sections including adhesive applied in a quadrangular shapes according to the patterns of adhesive shown in Figures 1 to 9.
  • the peripheral sections define a centralised portion free of adhesive for wrapping the product.
  • the substrate may be in the form of individual sheets on which the adhesive may be applied to define a multiple segments.
  • the substrate may be a continuous web wound into a roll and the substrate that passes through an adhesive application station including a roller that applies the adhesive.
  • the segments may then be cut from the sheet to form individual packages onto which a product may be loaded centrally onto the segments.
  • the segment may then be closed to the form a sealed satchel about the product.
  • the substrate may be exposed to a corona or plasma treatment to enhance the strength of the bond between the substrate and the adhesive.
  • Figures 1 to 9 and Figure 1 1 illustrate individual segments for forming packages.
  • the patters of the adhesive may be applied lengthwise and widthwise to peripheral sections, the peripheral sections may be i) applied up to the edge of the substrate, ii) spaced from the edge of the substrate, or iii) a combination of both.
  • Figure 1 1 illustrates a continuous web 41 of the substrate being unwound and passing through an adhesive application station 42 in which adhesive is applied in peripheral sections about a central blank region 43 for receiving a product. Following the adhesive application station 42, the continuous web 41 of material is then conveyed to a cutting station 44 at which the web 41 is cut into individual segments for forming satchels for a product.
  • Figures 12 and 13 are schematic perspective and end views respectively of a stachel package 50 in which the peripheral sections of adhesive have been applied.
  • the segments 40 are wrapped about the product so that the opposed lengthwise peripheral sections 10 are placed together to form a longitudinal seam 51.
  • the widthwise sections 20 are then closed to form ends of the satchel 50.
  • the widthwise sections 20 are folded to form a centralised sub-section 52, two flanking sub-sections 53 either side of the centralised sub-section 52 and two end sub-sections 54.
  • the flanking sub-sections 53 may be longer than the centralised sub-section, but are preferably equal to, or smaller than the centralised sub-section 52.
  • Substantially equal sized parts of the flanking sub-sections 53 adjacent to the centralised subsection 52 are folded over and bonded to the centralised sub-sections 52.
  • the end sub-sections 42 may then be placed and bonded together such that the end seam has, as shown in Figure 12 and 13, an inverted T-shape in which the centralised sub- section 52 and adjacent flanking sub-sections 53 form the top of the T-shape, and the leg of the T-shape includes the end sub-sections 54 bonded together.
  • the glue was applied in sections having a width of 25mm and a length of at least 50mm.
  • the sections were placed together and a pressure of approximately 2 bar was applied to the sections at ambient temperature to bond the sections together to form the test samples. After an appropriate period of time has lapsed to allow the glue to set, the samples were then delaminated over a length of 50mm. Table 1 below sets out the results of the peal tests.
  • test results were measured in terms of grams-force per 25mm width of the sample.
  • test results having a measurement of greater than or equal to 250g/25mm are regarded as confirming that the seam formed would adequately prevent the ingress of moisture and air into the package.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne un procédé et emballage, ledit procédé consistant à : appliquer un adhésif sur des sections de la surface d'un substrat d'une manière non uniforme, de manière à former des régions contenant plus d'adhésif que d'autres, et placer les sections d'adhésif ensemble de manière à former une couture scellée. Un des avantages de la présente invention est que la quantité d'adhésif nécessaire pour former une couture scellée peut être réduite.
PCT/AU2011/000589 2010-05-19 2011-05-19 Paquet et procédé Ceased WO2011143708A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2011256139A AU2011256139B2 (en) 2010-05-19 2011-05-19 A package and process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2010902196 2010-05-19
AU2010902196A AU2010902196A0 (en) 2010-05-19 A package and process

Publications (1)

Publication Number Publication Date
WO2011143708A1 true WO2011143708A1 (fr) 2011-11-24

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PCT/AU2011/000589 Ceased WO2011143708A1 (fr) 2010-05-19 2011-05-19 Paquet et procédé

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AU (1) AU2011256139B2 (fr)
WO (1) WO2011143708A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB781176A (en) * 1954-03-18 1957-08-14 Dickinson John & Co Ltd Improvements in or relating to the application of self-sealing adhesive to continuous paper and like webs
GB838558A (en) * 1957-10-31 1960-06-22 Lamson Paragon Ltd Improvements in and relating to continuous envelope assemblies
US4517787A (en) * 1982-08-17 1985-05-21 Frito-Lay, Inc. Method and apparatus for sealing bags
GB2200337A (en) * 1987-01-28 1988-08-03 Metal Box Plc Plastic bags
GB2208222A (en) * 1987-07-21 1989-03-15 Doboy Ltd Bag closure
US4997504A (en) * 1978-10-10 1991-03-05 Wood James R Method and apparatus for high speed pouch and bag making
WO2002008067A2 (fr) * 2000-07-24 2002-01-31 S. C. Johnson Home Storage, Inc. Feuille auto-adhesive d'emballage qualite alimentaire, et son procede de fabrication
US20080234120A1 (en) * 2007-03-22 2008-09-25 Nordson Corporation Apparatus and methods for non-contact adhesive dispensing to manufacture bags
US7713606B2 (en) * 2005-01-25 2010-05-11 Kokuyo S&T Co., Ltd. Adhesive product and transferring instrument

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB781176A (en) * 1954-03-18 1957-08-14 Dickinson John & Co Ltd Improvements in or relating to the application of self-sealing adhesive to continuous paper and like webs
GB838558A (en) * 1957-10-31 1960-06-22 Lamson Paragon Ltd Improvements in and relating to continuous envelope assemblies
US4997504A (en) * 1978-10-10 1991-03-05 Wood James R Method and apparatus for high speed pouch and bag making
US4517787A (en) * 1982-08-17 1985-05-21 Frito-Lay, Inc. Method and apparatus for sealing bags
GB2200337A (en) * 1987-01-28 1988-08-03 Metal Box Plc Plastic bags
GB2208222A (en) * 1987-07-21 1989-03-15 Doboy Ltd Bag closure
WO2002008067A2 (fr) * 2000-07-24 2002-01-31 S. C. Johnson Home Storage, Inc. Feuille auto-adhesive d'emballage qualite alimentaire, et son procede de fabrication
US7713606B2 (en) * 2005-01-25 2010-05-11 Kokuyo S&T Co., Ltd. Adhesive product and transferring instrument
US20080234120A1 (en) * 2007-03-22 2008-09-25 Nordson Corporation Apparatus and methods for non-contact adhesive dispensing to manufacture bags

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AU2011256139B2 (en) 2017-01-12

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