EP1414712A1 - Reclosable pack - Google Patents

Reclosable pack

Info

Publication number
EP1414712A1
EP1414712A1 EP20020794547 EP02794547A EP1414712A1 EP 1414712 A1 EP1414712 A1 EP 1414712A1 EP 20020794547 EP20020794547 EP 20020794547 EP 02794547 A EP02794547 A EP 02794547A EP 1414712 A1 EP1414712 A1 EP 1414712A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
layer
sealing
adhesive
according
container
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.)
Withdrawn
Application number
EP20020794547
Other languages
German (de)
French (fr)
Inventor
Jürgen Fett-Schudnagis
Thomas Offergeld
Thomas Renger
Dirk Vianden
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23Particular 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
    • B29C66/232Particular 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/814General 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
    • B29C66/8141General 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
    • B29C66/81427General 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/20Layered products comprising a layer of metal comprising aluminium or copper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00Layered products comprising a layer of paper or cardboard
    • B32B29/002Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers, i.e. products comprising layers having different physical properties and products characterised by the interconnection of layers
    • B32B7/04Layered products characterised by the relation between layers, i.e. products comprising layers having different physical properties and products characterised by the interconnection of layers characterised by the connection of layers
    • B32B7/12Layered products characterised by the relation between layers, i.e. products comprising layers having different physical properties and products characterised by the interconnection of layers characterised by the connection of layers using an adhesive, i.e. any interposed material having adhesive or bonding properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2068Means for reclosing the cover after its first opening
    • B65D77/2096Adhesive means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/007Forming single grooves or ribs, e.g. tear lines, weak spots
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321General 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328Paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/812General 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
    • B29C66/8122General 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 composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/814General 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
    • B29C66/8141General 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
    • B29C66/81411General 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
    • B29C66/81415General 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 bevelled
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/814General 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
    • B29C66/8141General 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
    • B29C66/81411General 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
    • B29C66/81421General 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
    • B29C66/81422General 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0097Glues, adhesives, e.g. hot melts, thermofusible adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00Metals, their alloys or their compounds
    • B32B2311/24Aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00Animal or vegetable based
    • B32B2317/12Paper, e.g. cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00Polyalkenes
    • B32B2323/04Polyethylene
    • B32B2323/043HDPE, i.e. high density polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00Polyalkenes
    • B32B2323/10Polypropylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2327/00Polyvinylhalogenides
    • B32B2327/06PVC, i.e. polyvinylchloride
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2377/00Polyamides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2025Multi-layered container, e.g. laminated, coated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2075Lines of weakness or apertures
    • B65D2577/2091Lines of weakness or apertures in cover

Abstract

The invention relates to a reclosable container (V) comprising an edge (R) and a multilayer foil (F) covering the opening (O) of the container and the edge (R), wherein the multilayer foil (F) consists of at least one outer layer (1), a sealing layer (2) facing the edge (R) and an adhesive layer (3) placed between the outer layer (1) and the sealing layer (2), wherein said sealing layer (2) is fixed along said edge (R) and is embrittled to form a tearing point (W). The embrittlement is achieved by means of a sealing tool (S), wherein the width (L) of the tearing point (W) has a double-padded form. The sealing tool (S) for producing the reclosable container (V) is configured with partial sealing surfaces (SF). According to the invention, the reclosable container is characterized by high closing safety even at low temperatures and under the influence of humidity. The double-padded embodiment enhances the stability of the reclosable seal and provides a more perfect fit.

Description

Reclosable packaging

The invention relates to a reclosable container (V) with a rim (R) and a container opening (O) and the edge (R) covering the multilayer sheet (F), wherein the multilayer foil (F) of at least one outer layer (1), one against the rim (R) facing the sealing layer (2) and a between the outer layer (1) and sealing layer (2) underlying adhesive layer (3), and wherein the sealing layer (2) along the edge (R) is attached, and a predetermined breaking point (W) is brittle, and a method of manufacturing a resealable container. Furthermore, the invention relates to a sealing tool (S) for producing the reclosable container (V).

Everyday items such as food, animal feed, as well as disposable items, such as disposable dishes or tissues are often used in portioned form in the trade in order to allow consumers easier handling and to facilitate portioning. Examples of portioned foods are meats, cheeses and ready-prepared salads or snack food, such as pretzel sticks, which are present in the package already in portioned form. The consumer has only to open the package, remove the desired amount of food, and can then place the remainder up to the final consumption. However, a problem that the re-closure of such a package is often not possible. As a result, the remaining in the packaging dry foods during storage of, are unsightly and lose their typical taste.

Although, there are forms of packaging in which the cover by mechanical engagement in a circumferential bead can be closed again. However, such packages have the disadvantage that they have an increased space requirement in the rule and can not take into account the desire of trading after space-saving as possible packaging. Furthermore, there are packages in which the cover with the base is connected with an adhesive. However, such packages often have the disadvantage that the adhesive prevents reclosing of the packaging due to lack of pressure-sensitive adhesion properties after a single opening.

Packaging in which the re-closure is achieved mechanically, are described for example in DE 3935480 A1. The DE 3935480 A1 discloses a package in which a plastic cover is connected with a cup-shaped plastic bottom part via a first weld. a line of weakness and / or a second weld seam / is for forming a tear-off strip are of the first weld seam at a distance (a) to the center of the lid positioned, which is provided circumferentially around the entire upper edge of the lower part. To open the package the tear strip is torn in a clockwise direction up to a stapling point welding, wherein the sealing (welding seam) and remains permanently itself is not ruptured. The packaging allows an easy opening of the package, without thereby the lid is bent. a hinge is formed, about which can be folded up as a rotation axis of the lid and can be closed again after complete or partial emptying of the package via a welded stapling point.

The resealable container, in which an exposed pressure sensitive adhesive layer after first opening of the container and pressed for reclosing the container edge, are known. Thus 4,913,307 discloses the US a package in which a multi-layered cover comprising an inner layer and a substrate layer is heat sealed over the inner layer in a region of the width "b" against the rim of the container. The edges of the tool to heat seal are arranged "pointed", so that during the sealing / compression process of the lid with the container edge of the seal area in "b" is defined by circular inner and outer grooves, which are to ensure a more precise tearing of the multilayer film. the substrate layer of the inner layer can be reissued to reseal and sealed removable and. EP 0868368 B1 discloses a closure device (S) for a container (C) having an opening (O), with a sheet (F) along the edge the opening of the container is welded, wherein the sheet (F) is composed of at least three layers, namely a S chweißschicht (1) applied to the opening edge and along a bead (4) of the width (L) is welded to the opening edge, an outer layer (2) which forms a barrier and an intermediate adhesive layer (3), the welding layer in the region of the bead (4) is provided with a weakening. The weakening of the welding layer in the region of the bead (4) is achieved by welding of the bead (4) by means of a heating rod (6) such that the welding layer (1) and the adhesive layer (3) over the entire width (L) of the bead ( 4) be deformed. The adhesive layer (3) is formed by applying a resin having a minimum thickness of 10 microns.

The known prior art reclosable containers have the disadvantage that the sealing reliability is often not sufficient to ensure resealing. During transport, particularly when the package is turned about to the lid of the resealed packaging can solve unintentional and the package contents can fall out. One reason for this is that the tear behavior of the welding slides to expose the adhesive is often poor. Thus, the initial tearing of the weldable film is associated with an increased force, resulting in a deformation of the cover, so that the accuracy of fit is no longer guaranteed. It was therefore an object of the present invention to improve both the tear behavior and the shutter security for the re-closing of reclosable containers.

A need also exists in a better reclosing especially when exposed to moisture as well as at lower temperatures, in particular refrigerator or freezer temperatures. If the containers are removed, for example, a refrigerator and opened, the condensed water can form a thin film of moisture on the container edge and on the exposed adhesive film so that a reclosing of the packaging is no longer possible, but at least more difficult. It may also happen that when

Frozen storage, the adhesive layer has only a reduced adhesion, no longer adheres sufficiently and thus opens the shutter.

It was therefore a further object of the present invention, the liability of

Adhesive layer for secure reclosure of reclosable

to improve containers and in particular both moisture exposure and at temperatures from 5 ° C to -20 ° C.

It is often an unpleasant odor in the free volume of the sealed

Packaging criticized by the constituents of the adhesive or by either

Film is caused.

It was therefore a further object of the invention to provide a low-odor

to provide adhesive layer for resealable containers.

There is also a need for an adhesive layer of the tearing at the

attract more film and both the initial exposing this adhesive layer and the following resealable opening processes and not threads.

often to the continuously running packaging machines can be observed that the cutting tools glue. It was therefore an object of the invention to provide an adhesive for the adhesive layer prepared of reduced a

Cold flow has.

In the manufacture of reclosable containers according to the prior

Technique sometimes occurs during the sealing process, a deformation of the uppermost layer of the multilayer film to. There is therefore the need for improved sealing tools for making reclosable container.

Furthermore, there is a desire in the packaging industry and the consumer to minimize the Aufrolltendenz the film after lamination or after the elevation.

The object is achieved by a reclosable container (V) with a rim (R) and a container opening (O) and the edge (R) covering the multilayer sheet (F), wherein the multilayer foil (F) of at least one outer layer (1), one against the edge (R) facing the sealing layer (2) and a between the outer layer (1) and sealing layer (2) underlying adhesive layer (3), and wherein the sealing layer (2) along the edge (R) is attached, and (to a predetermined breaking point W ) is brittle. In the region of the predetermined breaking point (W) retrieves the sealing layer (2) has a resistance to peeling before, which is higher than the adhesive strength between the sealing layer (2) and the adhesive layer (3) such that in the first opening step, the seal layer (2) in the region of the predetermined breaking point (W) remains and separates under demolition of the remainder of the sealing layer (2) and to expose a corresponding portion (4) of the adhesive layer, so that the closing of the container (V) is again carried out in which the exposed portion (4) the adhesive layer (3) at the predetermined breaking point (W) is applied to the remaining sealing layer. The embrittlement is achieved by means of a sealing tool (S), such that the predetermined breaking point (W) across the width (L) has a doppelwulstige form.

The term "sealing" is generally understood that a soft sealing medium abbindet adhesive. Heat supply and / or a minimum sealing pressure are required for this purpose. According to distinguish between heat sealing and cold-sealing, the question of which seal type is applied, used, for example, from the materials , the object to be packaged (eg. as the heat sensitivity) and the type of packaging machine is dependent.

In the cold seal cold seal adhesives ( "cold seal compositions") are used, which cause adhesion of two polymer layers at about room temperature under high pressure cold-seal adhesives are mainly as aqueous dispersions in an amount of 1 -. 6 g / m 2 on the bonded polymer applied and PVDC (polyvinylidene chloride), PVAC (polyvinyl acetate), and poly (meth) acrylates are based on rubber and rubber-like polymers built up. Heat sealing dispersions, heat sealing lacquers, hot melt adhesives, film made of thermoplastic elastomers and extrusion coatings are used for heat sealing. Heat sealing dispersions are predominantly PVDC -, PVAC poly (meth) acrylate or latex-containing dispersions, the sealable after evaporation of the water, dry and typically form transparent coatings in application amounts of about 2 to 15 g / m 2 in contrast to the heat sealing dispersions are at. the heat-seal lacquers under Using the same or similar polymers organic solvents. The application amount of the hot-sealing lacquers is about 1 to 12 g / m 2. As a rule, heat sealing lacquers can not be used to seal against various materials.

Hot-sealing adhesives contain on the basis of hot melt adhesives as the basic materials are generally ethylene-vinyl acetate copolymers, which are deposited in the roll coating or by extrusion onto the substrate.

Films of thermoplastic elastomers and extrusion coatings are also used for heat sealing, unchanstelle is spoken of "sealing" of "welding" wherein often these films are referred to as "welding film". In the present invention, these films are particularly preferred as a "sealing layer (2) used ". Also coextrudates belong to this group being understood as coextrudates multi-layer films whose layers are zusammenextrudiert merging in a single operation, extrusion. Sealable or weldable are all polymers, preferably elastomers which are thermoplastic in a temperature range of about 50 to about 220 ° C. In particular, the extrusion coating of PE (polyethylene) on carrier foils such as aluminum, polypropylene, polyester and polyamide permits a variety of packaging material specifications.

In the following the invention with reference to the preferred embodiment is explained in detail with reference to the drawings. Show it

1 shows the schematic structure of the multilayer sheet (F)

Figure 1a) shows a schematic cross-section through the inventive reclosable container (V) in the closed state.

Figure 1 b) shows a schematic cross-section through the inventive reclosable container (V) after the sealing, in a partially open state.

In the multi-layer film (F) may be many films as desired a combination. The multilayer film (F) is about 23-200 microns thick, preferably

40-160 microns, and most preferably 60-120 microns.

The outer layer (1) is usually composed of polyethylene terephthalate, polyamide, biaxially oriented polypropylene, polyvinyl chloride or metal foils, for example

Aluminum, and paper.

The thickness of the outer layer (1) is 20 to 150 microns, preferably 30 to 100

Microns, and particularly preferably 40 to 80 microns.

The outer layer (1) is such that it does not melt at temperatures up to 200 ° C.

The side of the multilayer film, which is used to seal or seal and as a sealing layer (2) is referred to, is usually made of a polymeric

Material with low elongation at break and tear propagation resistance.

(2) polyolefins are preferably used as the polymeric material for the sealing layer. Polyolefins used to for the sealing layer (2) include for example propylene, in particular ethylene-propylene-butylene

Copolymers, ethylene-propylene-butylene terpolymers or mixtures of these

Polymers. For the invention can be used films for the outer layer (1)

Sealing layer (2) and usable materials for the edge (R) are disclosed in EP

0868368 B1, DE 3935480 A1, US 4,913,307, DE 3413352 C2 and US 5,145,737 described. In a preferred embodiment, the sealing layer (2) made of high density polyethylene. The term "high density polyethylene" are polyethylenes to understand which are substantially linear and unbranched These polyethylenes have degrees of crystallinity of 60 -. 80% and a density of approximately 0.94

- 0.965 g / cm 3 -

The melting point of the polymeric material for the sealing layer (2) is generally from 80 to 160 ° C, preferably 100-140 ° C.

In a particular embodiment of the invention, a side of the foil, as

Sealing layer (2) is used, pre-treated. The pretreated side is hereby incorporated into the film composite structure, pretreated page is to

Sealant used.

Under pretreatment in the invention methods understood, with which the surface of plastic materials is changed to the adhesion to other

to improve materials, such as paints or adhesives. Known to the expert

Process are, for example, the corona process, or the flame treatment.

The thickness of the sealing layer (2) is 1 to 80 micrometers, preferably 10 to 60 microns and most preferably 20 to 50 microns.

Known composite combinations of multilayer films include:

- Metallized PET / PE / adhesive layer / PE

- PET-P / adhesive layer / PE

- PET (36 microns) / adhesive layer / PE

- PET (12-19 microns) / aluminum foil (7-9 microns) / PE (80 - 100 microns) / adhesive layer / PE (50 microns)

- PET / adhesive layer / coex PET / (PET coex is, for example, PE / PET / PE)

- PET / adhesive / polyolefin / heat seal lacquer.

In a particular embodiment of the invention, the sealing layer (2) contains a heat-sealable layer of cold-seal adhesive or heat seal adhesive. Preferably, the sealable layer of cold-seal adhesive or heat-seal adhesive is a polyolefin film which also seal layer (2) itself can be applied. The cold-seal adhesive or heat seal adhesive is all over or partially on the

Polyolefin applied. Preferably a partial order is preferred

Sealing area.

The cold-seal or heat seal adhesive is 2 to 10 g / m 2, preferably from 3 to

8 g / m 2, and particularly preferably 4 to 6 g / m 2.

In a particular embodiment of the invention, the multilayer film of (F) at least comprises: a) an outer layer (1) and b) two sealing sheets (2), wherein an adhesive layer (3) disposed between the sealing layers and wherein the adhesive layer (3) 70 to 99%, preferably 85 to 95% of the surface of a seal layer occupies.

Preferably, the outer layer (1) consists of polyethylene terephthalate. In the region in which the adhesive coating is partially recessed, a hard seal (permanent seal) between the sealing layers and the edge (R) is achieved by sealing. In a preferred type of configuration of the invention, the multilayer film (F) against the edge (R) is sealed such that the sealable amount of (R) 65 to 85% has a double bulge and is fixedly sealed to 35 to 25%. In a rectangular packing three sides with a double bead and a side with a hard seal, for example, provided. On the one hand this will require a lesser quantity of adhesive, on the other hand, the firmly sealed portion includes a hinge function: the cover remains connected to the packaging member, a faster and more accurately fitting reclosing is made possible.

The preparation of the multilayer film (F) is carried out by joining the outer layer (1) and the sealing layer (2) by means of the adhesive layer (3). The process of assembling and large-area bonding of films by adhesive is referred to as lamination. The joining may be performed by any suitable laminating process wherein the co-rolling or pressing together of the films is preferred. During the machining process by calendering (calendering) are laminated, the sheets with adhesive and under suitable roller pressures, temperatures and -antnebsgeschwindigkeiten in a defined path between the calender rolls out, while certain thickness, density or transparency values ​​or surface effects such as gloss, smoothness or receive coins.

According to a particularly preferred preparation of the multilayer film (F), the

Outer layer (1) and the sealing layer (2) laminated with an adhesive, wherein the adhesive is applied by means of a slot die, and by one or more

Roller pairs is carried out, wherein the lamination of the plastic sheets caused by the nip pressure of the roll pair or of the pairs of rollers.

The roller pairs are limited to 30 to 160 ° C, preferably at 40 to 150 ° C and heated particularly preferably at 50 to 130 ° C.

The roll pressure, based on a roll width of 1000 mm, 1 to 8 bar, preferably 2 to 7 bar and especially preferably 3 to 6 bar.

The laminating speed is 10 to 200 m / s, preferably 50 to 150 m / s, and particularly preferably 80 to 120 m / s.

The application of the adhesive takes place particularly preferably in the curtain-coating

Process.

In a preferred embodiment, is irradiated to accelerate the curing of the adhesive with UV light or electron beams.

After the process step of laminating the multilayer film (F) by means of a sealing tool against the edge (R) of the container opening (O) sealed. Here, the doppelwulstige predetermined breaking point (W) by means of the inventive sealing tool (S) is produced, the preferred embodiment will be explained in more detail in FIG. 2

Figure 2: shows a schematic cross section through the inventive sealing tool (S).

The sealing tool (S) for producing the reclosable container of the invention (V) is with partial sealing surfaces (SF) configured. The embodiment with the partial sealing surfaces (SF) allows the embrittlement such that the predetermined breaking point (W) across the width (L) receives a doppelwulstige form. The sealing tool (S) can have different shapes, for example, in cross section, a roof-shaped or horseshoe-shaped form. In the preferred embodiment, the sealing tool (S) has a horseshoe-shaped form in cross section. In all embodiments, the selected basic geometry is such that in cross-section two sealing walls are separated by a gap with the corresponding partial sealing surfaces. Depending on the type and requirements for the product reclosable container, both the width of the gap and the width of one or both sealing walls may vary.

The width of a seal Walls is 1 to 16mm, preferably 1, 5 to 10mm and most preferably 2mm to 6mm. The width of the space between the sealing walls is 0.5 mm to 18mm, preferably 1mm to 10mm, and particularly preferably 1, 5 to 5mm.

In contrast to known sealing tools, the seal over the entire width "L", a higher sealing pressure per unit area Reduced sealing surface is determined by the configuration with partial sealing surfaces with the same pressing force achieved. Performs, as stated in DE 34133352 C2, between a smaller contact area sealing tool (S), multi-layer film (F) and edge (R) and optionally to an insufficient overall strength of the weld produced. DE 3413352 C2 proposes a seal over the entire region "L" to solve this problem by at least one of the primary weld area adjacent secondary welding area is provided, in which the cover and shell part less strongly pressed against each other as in the primary weld area. In the present invention, a sufficient overall strength is achieved by the design of the sealing tool with two partial sealing surfaces. Due to the parallel Siegelwülste (double bead) is not only achieved a higher strength, but also a better sealing effect. In order to facilitate purification, for example, of adhesive residue, the sealing tool, for example, PTFE (polytetrafluoroethylene) may be coated appropriately.

In a particular embodiment, the sealing layer (2) of the reclosable container (V) predetermined breaking points in the form of weakening lines contains. The sealing layer (2) is here, for example scratched, cut, perforated. The scoring, cutting or perforating the sealing layer (2) is carried out during the manufacture of the multilayer film or, preferably, during the sealing process, for example by selective irradiation with laser light.

If the predetermined breaking points during the sealing process by the

Sealing tool (S) is generated, in one particular embodiment, preferably a partial sealing face of the sealing tool according to the invention (S) has an edge

(5) (Fig. 2a).

In a further particular embodiment, the sealing tool contains (S) - preferably - separately attached edge (6) in a partial sealing surface

(SF), which can optionally be replaced after a certain service life

(Fig. 2b).

In another embodiment, the worked out from the partial seal face edge (5) may be replaced by toothed, serrated, wedge-shaped or undulating elevations.

The depth of the edge (5), (6) or of the toothed, serrated, wedge-shaped or wave-shaped elevations is dimensioned such that it the thickness of the outer layer

(1).

By the edge (5), (6) or of the toothed, serrated, wedge-shaped or wave-shaped elevations is effected in particular weakening the sealing edges of the sealing layer (2) and allows a systematic cracking in the desired range. The weakening of the sealing edge (SK) or sealing edge extends over the entire region of the predetermined breaking point (W) or preferably on a portion (TB) of the predetermined breaking point (W) and

Sealing limited, the tear tab is in the range of usually mounted on (Fig. 3a). The edge (5), (6) or of the toothed, serrated, wedge-shaped or wave-shaped elevations are arranged so that the outer layer (1) during sealing process is not perforated cut or the like is damaged. Due to their resilience, the outer layer (1) after the sealing process no or only small embossments caused by the inventive sealing tool (S). In a further particular embodiment, the sealing tool (S) is shaped so that the tab region not a round seal, but a rectangular ausgebrachte sealing takes place (Fig. 3b). By the square marked seal in the tab area a dot-shaped contact surface is generated, which enables a targeted disruption.

Figure 3 a): shows the schematic plan view of the sealing area with a schematically illustrated partial region in which one or all sealing edges are weakened.

Figure 3 b): shows schematically in plan view a square pronounced sealing.

For the case where the addition of a solid double bead seal is generated is at least modified accordingly to compensate for the lack of adhesive in the preferred thickness range of 15 to 25 microns, a partial sealing surface.

Another object of the invention is a method for manufacturing a reclosable container (V) with a rim (R) and a container opening (O) and the edge (R) covering the multilayer sheet (F), wherein the multilayer foil (F) of at least one outer layer (1), one against the edge (R) facing the sealing layer (2) and a between the outer layer (1) and sealing layer (2) underlying adhesive layer (3), and wherein the sealing layer (2) along the edge (R) is attached and is embrittled to a predetermined breaking point (W) and the embrittlement by means of a sealing tool (S) is reached and the predetermined breaking point (W) across the width (L) receives a doppelwulstige form. According to a preferred embodiment of the method, the sealing layer (2) is predetermined breaking points in the form of weakening lines, generated, for example by scoring, perforating or cutting during the preparation of the multilayer film or, preferably, during the sealing process.

The resealable container of the invention is characterized by high closing safety even at low temperatures and under the influence of moisture from. The doppelwulstartige embodiment increases the stability of the re-closure and leads to a higher accuracy of fit.

The resealable container of the invention is suitable for the packaging of sensitive products such as chocolate, coffee, salt sticks, marzipan and the like. Due to the excellent resealing the reclosable container for packaging particularly oxidation-sensitive food and beverages suitable.

For producing the multilayer sheet (F) the outer layer (1), and the

Sealing layer (2) joined together by means of the adhesive layer (3).

The layer thickness of the adhesive layer (3) at 2 - 30 microns, preferably 5-20

Microns, and most preferably 8-15 microns. the applied

Amount of the adhesive is 1 to 30 g / m 2, preferably from 3 to 25 g / m 2, and particularly preferably 5 to 20 g / m 2.

The adhesive layer (3) is formed by a pressure sensitive adhesive which has a viscosity of

5,000 to 30,000 m * Pas, preferably from 8000 to 25000 m * Pas, and particularly preferably 10,000 to 20,000 m * Pas at 150 ° C, measured according to Brookfield (ASTM

D-3236-88), has.

PSAs are called and abbreviated "PSA" also called "sensitive adhesives pressure", are viscoelastic adhesives at about 20 ° C remain in solvent-free form permanently tacky and adhesive and stick with low substrate specificity under light pressure immediately to virtually all substrates , PSAs are in the form of solutions in organic solvents, aqueous dispersions or melts onto the substrate - applied - usually referred to as carrier material. aliphalische solvent, for example ethyl acetate or methyl ethyl ketone are preferred, if necessary, hexane or heptane or low-boiling hydrocarbon mixtures such as petroleum ether. According to applicable PSAs un describe 3,239,478 US 5,292,842, for example, in WO 01/14491, WO 98/00471, US 2001/0044024 A1, US.

Also, low viscosity, solvent-free reactive systems (especially polyurethane systems) can be used as pressure sensitive adhesives and possibly irradiated for post-curing with UV or electron beams

As raw materials for pressure-sensitive adhesives are water-soluble and water-insoluble base polymers, plasticizers, waxes, resins, especially tackifying resins to improve adhesion, fillers and additives such as preservatives, antioxidants, stabilizers and dyes.

The base polymer determine substantially the cohesive properties, the strength and the thermal behavior of the pressure-sensitive adhesive. The base polymers are included wt .-% in the pressure-sensitive adhesive as a component A is generally in a concentration of 1 to 50 wt .-%, preferably in an concentration of 5 to 40 wt.

In general, a pressure-sensitive adhesive of at least one base polymer and at least one tackifying resin (so-called. Tackifiers) constructed, wherein the tackifying resin may be in some systems replaced by low molecular weight fractions of the base polymer. To increase the cohesion, the base polymer is in some systems linked to the job or vulcanized rubber in the case of pressure sensitive adhesives.

Accordingly, natural and synthetic rubbers are used in conjunction with modified natural resins, phenol-formaldehyde resins or hydrocarbon resins as base polymers for pressure sensitive adhesives. In addition to rubber are often polyacrylate, polymethacrylate, polyvinyl ethers and Polyisobutentypen also often used in combination with resins. For special applications, silicone resin adhesives are known.

The dispersion adhesives are mainly commissions on polyacrylate dispersants such. T. also constructed in particular vinyl acetate copolymers, wherein most resins also be added here.

For melt pressure sensitive adhesives is mainly used in addition to suitable resins as

Base polymers:

1) Flexible polymers such as block copolymers, for example. As styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene-butylene-styrene, styrene-ethylene propylene-styrene;

2) ethylene-vinyl acetate polymers, other ethylene esters and copolymers, z. For example, ethylene methacrylate, ethylene n-butyl acrylate and ethylene acrylic acid;

3) polyolefins such as polyethylene and polypropylene, in particular amorphous • propylene-alpha-olefins (APAO);

4) polyvinyl acetate (PVAc) and copolymers PVAc

5) polyacrylates;

6) polyamides;

7) Polyester;

8) polyvinyl alcohols (PVA), and PVA copolymers;

9) polyurethanes;

10) polystyrenes;

11) polyepoxides;

12) copolymers of vinyl monomers and polyalkylene oxide polymers;

13) Aldehydes containing resins such as phenol-aldehyde, urea-aldehyde, melamine-aldehyde and the like.

The resin to improve the adhesion and improve the compatibility of pressure sensitive adhesive components. It is used as component B in general in an amount of 1 to 80 wt .-%, preferably in an amount of 35 to 65 wt .-%. This is to a) hydroabietyl alcohol and its esters, more particularly its esters with aromatic carboxylic acids such as terephthalic acid and phthalic acid, b) preferably modified natural resins, such as resin acids from gum rosin, Taliharz or wood rosin, for example fully saponified balsam resin or alkyl esters of optionally partly hydrogenated colophony with low softening points such as for example methyl, diethylene glycol, glycerol and pentaerythritol esters, c) acrylic acid copolymers, preferably styrene-acrylic acid copolymers, acrylate copolymers, d) resins based on functional hydrocarbon resins and e) aliphatic, cycloaliphatic, aromatic, alkyl aromatic hydrocarbon resins.

It is also possible, as the tackifying resin an alkyl ester of partially hydrogenated

employ rosin, wherein the alkyl group preferably contains 1 to 6 carbon atoms.

It is preferred to use partially polymerized Taliharz, hydrogenated hydrocarbon resin and rosin glycerol ester.

The wax is contained in the pressure-sensitive adhesive as a component C in general in a concentration of 0 to 40 wt .-%, preferably in a concentration of 5 to 40 wt .-%.

The wax used may be natural, chemically modified or synthetic origin. As natural waxes, vegetable waxes, animal waxes, mineral waxes or petrochemical waxes can be used. As chemically modified waxes are hard waxes such Montanesterwachse, sarsol waxes, etc. are used. Suitable synthetic waxes are polyalkylene waxes and polyethylene glycol waxes. Preferably, petrochemical waxes, such as petrolatum, paraffin waxes, microcrystalline waxes, and synthetic waxes, in particular Polyethyienwachse with melting points of 85 to 140 ° C and molecular weights ranging from 500 to 3500, paraffin waxes with melting points in the range of 45 to 70 ° C and molecular weights between 225 and 500, microcrystalline waxes with melting points in the range of 60 to 95 ° C as well as synthetic Fischer-Tropsch waxes with melting points in the range of 100 to 115 ° C. The plasticizer contained in the pressure-sensitive adhesive as component D, generally in a concentration of 1 to 30, preferably in a concentration of 5 to 30 wt%.

Useful plasticizers are monohydric or polyhydric alcohols, preferably glycol monophenyl ether, hexamethylene glycol, glycerol and, in particular, polyalkylene glycols with a molar mass from 200 to 6 000. Preference is given to polyethylene glycols having a molecular weight up to about 1000, preferably to about 600. Also, polypropylene glycol and polybutylene glycol and polymethylene are useful. Conveniently, esters are used as plasticizers, for example liquid polyesters and Glycerinester as glycerol diacetate and glycerol, and neopentyl glycol dibenzoate, glyceryl tribenzoate, pentaerythritol tetrabenzoate and 1, 4-cyclohexane dimethanol dibenzoate. Finally, alkyl monoamines and fatty acids preferably containing 8 to 36 carbon atoms can be useful. Plasticizers are preferably used based on aromatic dicarboxylic acid esters, therefore, the corresponding ester of phthalic acid, isophthalic acid or terephthalic acid. The alcohol radical in these esters used as plasticizers usually has 1 to 8 carbon atoms. Above all, medicinal white oil and naphthenic mineral oil are suitable.

The fillers, as component E, although can be used in concentrations of 0 to 30 wt .-% in order to reduce the pressure sensitive adhesive, but preferably they are, the performance, the technical adhesive and optionally improve work-up properties. These are solid, non-volatile inert substances. Mention may be made especially chalk.

In addition, customary auxiliaries and additives can be added to the adhesive as component F. Here, the stabilizers are to be mentioned first. They have the task to prevent the reactive monomers from entering into an unwanted or premature reaction and to protect the polymers against decomposition during processing. This is where the antioxidants are, in particular. They are usually added in amounts up to 3 wt .-%, preferably in amounts of about 0.1 to 1.0 wt .-% to the pressure sensitive adhesive. Other auxiliaries and additives are color pigments, particularly TiO 2. The useful as pressure-sensitive adhesive according to the inventive use composition generally contains the following components:

A) from 1 to 50, preferably 5 to 40 wt .-% of at least one basic polymer from the group of ethylene and / or styrene copolymers,

B) from 1 to 80, preferably 35 to 65 wt .-% of at least one resin from the group of aliphatic, cycloaliphatic or aromatic hydrocarbon resins,

D) from 1 to 30, preferably 5 to 30 wt .-% of at least one plasticizer from the group of medicinal white oils or naphthenic mineral oils.

F) from 0 to 3, preferably 0.1 to 1.0 wt .-% of at least one stabilizer, antioxidant, or other additives, wherein the sum of components being 100 wt .-% is obtained.

Pressure-sensitive adhesives are preferred having a viscosity from 5,000 to 30,000 m * Pas, preferably from 8000 to 25000 m * Pas, and particularly preferably 10,000 to 20,000 m * Pas at 150 ° C, measured according to Brookfield (ASTM-D-3236-88) for the application used on high-speed laminating machines. This laminating machines run at speeds of 80 to 150 m / s.

Strahlungsvemetzbare PSAs are particularly hot melt pressure sensitive adhesives that contain the following:

A) 1 to 40 wt .-% of at least one basic polymer from the group of styrene block copolymers, in particular styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene-butylene-styrene , styrene-ethylene-propylene-styrene block copolymers;

B) from 35 to 90 wt .-% of at least one resin selected from the group hydrocarbon resin, rosin-Glycerinester and / or acrylate copolymers;

C) 0 to 40, preferably 5 to 40 wt .-% of at least one wax from the group of microcrystalline waxes,

D) 0 to 30 wt .-% of at least one plasticizer from the group of medicinal white oil, E) 0 to 30 wt .-% of at least one filler and

F) from 0 to 3, preferably 0.1 to 1.0 wt .-% of at least one stabilizer, photoinitiator, antioxidant, or other additives, wherein the sum of components being 100 wt .-%.

Under the term "radiation-crosslinkable" triggering a polymerization reaction under the influence of radiation is within the scope of the present invention understood (photopolymerization). Undercutting any kind of radiation is to be understood here that causes irreversible crosslinking in the to be irradiated crosslinkable hot-melt pressure-sensitive adhesive layer. suitable are particularly UV, electron-beam, short-wavelength visible light, but also infrared radiation. in ESH UV irradiation or the desired product properties through the radiation dose can be set, wherein IR radiation through the product temperature and the residence time.

An overview of the prior art for radiation crosslinking of hot melt pressure sensitive adhesives can be found for example in R. Jordan, "melt pressure sensitive adhesives", Volume 6 b from the series "glue monographs" from Hinderwaldner- Verlag, 1989, pages 126 to 155 or in the article "UV -vernetzbare acrylate hot-melt pressure-sensitive adhesives "by Auchter, Barwich, Rehmer and hunter in" stick & dense "37 (1993), pages 14 to 20th

In this invention, the radiation cross-linking is preferably by UV or electron beams.

The irradiation of the hotmelt pressure-sensitive adhesive of the invention with UV light takes place at a wavelength ranging from 100 nm to 380 nm. The generation of the ultraviolet rays is generally carried out in gas discharge lamps, of which in particular mercury vapor lamps as medium and high pressure lamps (1 to 10 bar) can be used. The UV radiation dose is from 50 to 2000 J / cm 2 shall apply. In the irradiation of the hotmelt pressure-sensitive adhesive of the invention with electron beams, a radiation dose of 10 to 100 kilo Gray (kGy) is preferred.

In the irradiation of the hotmelt pressure-sensitive adhesive of the invention with UV light, crosslinking in addition to the specific radiation dose, through the use of photoinitiators, photosensitizers or regulator molecules (component F) is controlled, wherein component (F) 0.1-3 wt .-% is included in the formulation, based on the total composition.

According to the invention to be used Schmelzhafthaftklebstoff- compositions are generally prepared by mixing, preferably under an inert gas atmosphere and / or vacuum of

1. plasticizers, waxes and resins at 120 ° C to 180 ° C, especially at 160 ° C to form a homogeneous melt,

2, optionally prepared by fillers, excipients and, finally, the base polymer with stirring until homogeneous.

After completely homogenized composition is allowed to cool in suitable containers, whereupon it solidifies. She is now a usable form. The melt could be applied without cooling directly to a substrate and are used directly for bonding.

The pressure sensitive adhesives used in this invention form transparent, and, depending on the coating weight of the adhesive, virtually streak-free adhesive layers (3). Under transparent is clear to clear more or less understood. The PSAs used in this invention are characterized by a neutral odor and little to no ink train from. They are approved for indirect food contact. The pressure sensitive adhesives used in this invention are particularly suitable for curtain coating process, since the pressure-sensitive adhesive film does not tear during the fall. Furthermore, the pressure sensitive adhesive for inventive use is characterized by excellent heat stability. Therefore, it is particularly suitable for use on reclosable packages whose contents must be sterilized. The pressure sensitive adhesive is suitable for all known multi-layer films and is excellent resealing, in particular at low temperatures as well as under the influence of moisture on. The adhesive according to the invention to be used is also suitable for laminating machines that are designed for the processing of solvent-containing laminating adhesives. For this purpose, the pressure-sensitive adhesive in ethyl acetate or MEK used according to the invention, optionally also dissolved in hexane or heptane or low-boiling hydrocarbon mixtures, for example petroleum ether.

The invention will now be described in detail.

Description of measurement methods

♦ determining the viscosity according to Brookfield, Model RVT DV II, 150 ° C, to ASTM D 3236-88

♦ stringing:

In the melted at about 160 ° C melt pressure sensitive adhesive, a glass rod is immersed, and then slowly withdrawn judges the rheological behavior of the pressure-sensitive adhesive visually. To assess include the way of draining the molten adhesive from the glass rod and the formation of adhesive filaments during withdrawal of the glass rod from the adhesive melt.

Examples

I. adhesive engineering studies

The pressure sensitive adhesives Liotron PS commercially available 4110 (hot melt adhesive Acrylsäureesterbasis, viscosity: 5000-15000 m * Pas at 140 ° C, measured according to Brookfield) and TECHNOMELT Q 8707 (melt pressure sensitive adhesive based on synthetic rubber and hydrocarbon resin viscosity. 22000-28000 m * Pas at 150 ° C, measured according to Brookfield) from Henkel were prepared by the curtain coating method on a pilot plant (manufacturer: Billhöfer) by means of a slot die (manufacturer:.. Fa Inatek) for the preparation of a multilayer film consisting of PET / adhesive layer / PE applied. The coating weight was in all cases at 20 g / m 2. Liotron PS 4110 was applied at a temperature of 50 ° C and a machine speed of 10 m / s. The laminating pressure was 200 to 300 kg. The pressure sensitive adhesive was additionally provided with a UV-C lamp (500 mm wide, 200 W / cm maximum, 20 Ampere, 87.5% power) irradiates. TECHNOMELT Q 8707 was applied at a temperature of 120 ° C and a machine speed of 10 m / s at a rate of 20 g / m 2. The laminating temperature was 60 ° C, the laminating pressure from 200 to 300 kg. In a subsequent experiment TECHNOMELT Q was plotted 8707-23 at 130 ° C at a line speed of 20 m / s and a coating weight of 10 g / m 2. Again, the laminating pressure was 200 to 300 kg. In a further test sequence a multi-layer composite film having the structure PET / Alu / PE / adhesive / PE was prepared with TECHNOMELT Q 8707-23.

Results

The multilayer films prepared in (I) are distinguished by practical common

Verbundhaftungs- and sealing seam adhesion values.

Even after more than 20 Verschließvorgängen resulted in a good

Reclosure.

Table 1: Results 2er composite (PET / adhesive / PE) Table 2: Results of 4 composite (PET / Alu / PE / adhesive / PE)

Table 1:

Table 2:

To Table 2:

Q 8707-23 / pretreated PE side means that the adhesive on the untreated side of the polyethylene, which is used as a sealing layer (2) is applied. The pre-treated side of the polyethylene sealing layer is used for sealing.

Q 8707-23 / pretreated PE side is, that the adhesive is on the pretreated side which is used as a sealing layer (2) of the polyethylene, is applied. The μnbehandelte side of the polyethylene sealant layer is used for sealing.

LIST OF REFERENCE NUMBERS

1 = outer layer

2 = sealing layer

3 = adhesive layer

4 = exposed adhesive layer by elevation

5 = edge on sealing surface

6 separately attached edge V = tank

R = the edge

O = container opening

F = multilayer film

W = breaking point

S = sealing tool

L = width of the double bulge

SK = sealing edge (s)

TB = partial area of ​​the sealing

Claims

claims
1. A reclosable container (V) with a rim (R) and a container opening (O) and the edge (R) covering the multilayer sheet (F), wherein the multilayer foil (F) of at least one outer layer (1), an edge against the (R) facing the sealing layer (2) and a between the outer layer (1) and sealing layer (2) underlying adhesive layer (3) and being fixed, and the sealing layer (2) along the edge (R) to a predetermined breaking point (W) is embrittled, characterized in that the embrittlement by means of a sealing tool (S) has been reached and the predetermined breaking point (W) across the width (L) has a doppelwulstige form.
2. The resealable container (v) of claim 1, characterized in that the outer layer (1) made of polyethylene terephthalate, polyamide, biaxially oriented polypropylene, polyvinyl chloride or metal foils, for example aluminum, and paper.
3. A reclosable container (V) according to claim 1 characterized in that the polymeric material for the sealing layer (2) are polyolefins from the group of propylene copolymers, especially Ehylen-propylene-butylene copolymers, ethylene-propylene-butylene terpolymers or mixtures of these polymers, as well as high density polyethylene.
4. A reclosable container (V) according to claim 3, characterized in that the melting point of the polymeric material for the sealing layer (2) at 80 ° C - 160 ° C.
5. A reclosable container (V) according to at least one of claims 1 to 4, characterized in that the sealing layer (2) comprises predetermined breaking points in the form of lines of weakness.
6. The resealable container (V) according to claim 1, characterized in that the multilayer sheet (F) at least: a) an outer layer (1) and b comprises) two sealing layers (2), wherein there is a layer of adhesive (3) between the seal layers and wherein the adhesive layer (3) 70 to 99%, preferably 85 to 95% of the surface of a seal layer occupies.
7. A reclosable container (V) according to claim 6, characterized in that the multilayer sheet (F) against the edge (R) is sealed such that the sealable amount of (R) 65 to 85% having a double bead, and 35 to 25% is to be sealed.
8. The resealable container (v) according to any one of claims 1 to 7, characterized in that the sealable gasket layer (2) contains a heat-sealable layer of cold-seal adhesive or heat-sealing adhesive.
9. A reclosable container (V) according to claim 1, characterized in that the layer thickness of the adhesive layer (3) 2 - is 30 micrometers.
10. A reclosable container (V) according to claim 9, characterized in that the adhesive layer (3) is formed by a pressure sensitive adhesive which has a viscosity of 5000 m * Pas to 30,000 m * Pas at 150 ° C measured (according to Brookfield ASTM-D-3236-88), has.
11. A reclosable container (V) according to any one of claims 1 to 10, characterized in that the adhesive layer (3) includes:
A) 1 to 50 wt .-% of at least one basic polymer from the group of ethylene and / or styrene copolymers,
B) 1 to 80 wt .-% of at least one resin from the group of aliphatic, cycloaliphatic or aromatic hydrocarbon resins,
D) 1 to 30 wt .-% of at least one plasticizer from the group of medicinal white oils or naphthenic mineral oils.
F) 0 to 3 wt .-% of at least one stabilizer, antioxidant, or other additives, wherein the sum of components being 100 wt .-%.
12. A reclosable container (V) according to any one of claims 1 to 11, characterized in that the adhesive layer (3) contains a radiation-cross-linked adhesive.
13. A method of manufacturing a reclosable container (V) according to at least one of claims 1 to 12, with a rim (R) and a container opening (O) and the edge (R) covering the multilayer sheet (F), wherein the multilayer film (F lying) of at least one outer layer (1), a (against the rim R) facing sealing layer (2) and a (between the outer layer 1) and sealing layer (2) adhesive layer (3), and wherein the sealing layer (2) along the rim ( R) mounted to and a predetermined breaking point (W) is embrittled and wherein the embrittlement (by means of a sealing tool S) is reached and the predetermined breaking point (W) across the width (L) receives a doppelwulstige form.
14. Use of a reclosable container (V) according to at least one of the preceding claims, for the packaging of sensitive products, in particular oxidation-sensitive food and beverages.
EP20020794547 2001-08-06 2002-08-03 Reclosable pack Withdrawn EP1414712A1 (en)

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DE10137808 2001-08-06
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JP2004537480A (en) 2004-12-16 application
DE10235687A1 (en) 2003-02-20 application
WO2003013976A1 (en) 2003-02-20 application
CA2456787A1 (en) 2003-02-20 application
KR20040019390A (en) 2004-03-05 application
US20040180118A1 (en) 2004-09-16 application

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