WO1991008898A1 - Process for manufacturing membrane lids for sealing containers - Google Patents

Process for manufacturing membrane lids for sealing containers Download PDF

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Publication number
WO1991008898A1
WO1991008898A1 PCT/EP1990/002254 EP9002254W WO9108898A1 WO 1991008898 A1 WO1991008898 A1 WO 1991008898A1 EP 9002254 W EP9002254 W EP 9002254W WO 9108898 A1 WO9108898 A1 WO 9108898A1
Authority
WO
WIPO (PCT)
Prior art keywords
tear
layered material
metallic
metallic foil
lids
Prior art date
Application number
PCT/EP1990/002254
Other languages
French (fr)
Inventor
Gerda Maria Hartzheim
Original Assignee
Alcan International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcan International Limited filed Critical Alcan International Limited
Publication of WO1991008898A1 publication Critical patent/WO1991008898A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered 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
    • B32B15/12—Layered 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 paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered 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
    • B32B15/08—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041—Pull tabs
    • B65D2577/205—Pull tabs integral with the closure

Definitions

  • the invention relates to a process for
  • membrane lids consisting of a multi-layered material having at least one metallic layer for sealing containers, these caps having at least one tear-off flap free of metal projecting out from the periphery of the container.
  • Membrane lids serving to seal containers and having a metallic layer and a plastic layer as well as a
  • non-metallic tear-off flap have already been suggested by the German patent application P 39 20 324.7 not disclosed prior to the present application.
  • the absence of metal in the tear-open flap of these membrane lids serves to allow them to be sealed onto the container, which is to be sealed in a trouble-free manner, through inductive heating by means of the sealing layer applied on the membrane lid, as the inducing currents applied during the sealing are not influenced by metal in the tear-open flap.
  • This object is solved in accordance with the invention by a process of the type initially stated above in that firstly, cut-outs are made in a metallic foil, for example an aluminium foil, wherein the tear-open flaps of the membrane lids to be subsequently cut out of the multi-layered material come to be located within the cut-outs, that a non-metallic layer which consists of a hot-sealable material and/or on the surface of which a layer of hot-sealable material is applied is then laminated onto the metallic foil, and that finally the container lids having tear-open flaps are cut out of the multi-layered material formed in this way in such a manner that the tear-open flaps are formed out of the non-metallic areas of the multi-layered material.
  • the cut-outs in the metallic foil are made in such a manner that the edges thereof come to lie at the edges of the membrane lid to be later cut out of the multi-layered material.
  • the membrane lids can be cut out of the multi-layered material together with their tear-open flaps in such a manner that the respective tear-open flaps of several lids are formed out of the areas of the multi-layered material free of metallic foil. In this way, the number of cut-outs to be made in the metallic foil can be reduced.
  • differently sized lids having non-metallic tear-open flaps can be cut out of the multi-layered material with the same pattern of the non-metallic areas.
  • the same cutting tool for making the cut-outs in the metallic foil can be used.
  • the containers closed by means of the membrane lids are additionally closed with a screw cap in which a coated cardboard, or a paper-plastic laminate can be arranged as a secondary seal to enable a tight
  • the metallic foil is provided with a layer of cardboard, paper or the like on the side
  • multi-layered material is joined with the inner side of the screw cap in a securely bonded manner.
  • the cardboard layer shears off from the actual sealing membrane and remains as a secondary seal in the screw cap.
  • the laminating substances used for the building-up of the multi-layered material can be selected such that during the first time of opening of the screw cap the separation of the laminate ensues on account of the shearing between the metallic foil and the non-metallic layer sealed onto the rim of the container opening.
  • the metallic foil is provided with a layer, for example of cardboard, paper or the like, which is located on an outer side of the multi-layered material, and that a further metallic foil is applied on the
  • the laminating material joining the metallic foils can be a laminating substance having a low bonding strength so that a
  • Fig. 1 shows the plan view of a metallic foil laminate, having cut-outs made in the first step of the inventive process and in which the broken lines show the lid edges which are subsequently to be cut out;
  • Fig. 2 shows a section through the metallic foil
  • Fig. 3 shows the plan view of the multi-layered material made in the second process step, in which material the hatched areas represent the cut-outs in the metallic foil laminate and the broken lines represent the subsequent outlines of the lids;
  • Fig. 4 shows a section through the multi-layered
  • Fig. 5 shows the plan views of the multi-layered
  • Fig. 6 shows the section through the multi-layered
  • Fig. 7 to 10 show plan views of multi-layered materials having different.lv arranged cut-outs within the metallic foil laminate and the membrane lids including tear-open flaps to be cut out in the last process step;
  • Fig. 11 shows a plan view of a further multi-layered
  • Fig. 1 shows a metallic foil laminate 12 in which cut-outs 11 are made in accordance with the first step of the process according to the invention, wherein the tear-open flaps 2 of the membrane lids 1 (shown with broken lines) to be later cut out of the multi-layered material comes to be located within the cut-outs 11.
  • the metallic foil laminate 12 consists of a metallic foil 9 which, as may be seen in Fig. 2, is joined by means of a laminating substence 8 to cardboard 6.
  • Fig. 3 shows the plan view of the multi-layered material manufactured in the second process step by laminating a plastic foil laminate 13 onto the metallic foil laminate 12.
  • the areas 16 of this multi-layered material within which the cut-outs 11 covered by the plastic foil laminate are located are shown by means of hatching.
  • the plastic foil laminate 13 consists of a plastic foil 7 and a layer of hot-sealable material 10 applied thereto.
  • this laminate 13 is laminated onto the metallic foil 9 of the metallic foil laminate 12 with the aid of a laminating subsance 8 in the second process step.
  • the hot-seal layer 10 serves for the subsequent sealing of the membrane lid to the multi-layered material which is to be cut out.
  • the membrane lids 1 having a tear-open flap are cut out of the multi-layered material according to Fig. 3 in such a manner that the tear-open flaps of three membrane lids are respectively formed out of one of the areas 16 of the multi-layered material which is free of metal.
  • Figs. 7 to 10 show differently arranged areas 16 free of metal out of which a different number of tear-open flaps are formed in the final process step.
  • the membrane lids according to Figs. 9 and 10 respectively have a second tear-open flap which is to be formed.
  • the number of tear-open flaps can be increased even further by appropriately arranging the blanks.

Landscapes

  • Cartons (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a process for manufacturing membrane lids (1) consisting of a multi-layered material having at least one metallic layer for sealing containers, the lids having at least one tear-open flap (2) projecting out over the periphery of the container. Here, an improved process is achieved in that firstly, cut-outs (11) are made in a metallic foil (9), in the regions of the cut-outs of which the tear-open flaps (2) of the membrane lids (1) to be subsequently cut out of the multi-layered material come to be located, that a non-metallic layer consisting of a hot-sealable material and/or on the outer side of which a layer of hot-sealable material (10) is applied is then laminated onto the metallic foil (9), and that finally, the membrane lids (1) having tear-open flaps (2) are cut out of the multi-layered material formed in this way in such a manner that the tear-open flaps are formed out of the areas (16) of the multi-layered material which are free of metallic foil.

Description

Process for manufacturing membrane lids for
sealing containers
The invention relates to a process for
manufacturing membrane lids consisting of a multi-layered material having at least one metallic layer for sealing containers, these caps having at least one tear-off flap free of metal projecting out from the periphery of the container.
Membrane lids serving to seal containers and having a metallic layer and a plastic layer as well as a
non-metallic tear-off flap have already been suggested by the German patent application P 39 20 324.7 not disclosed prior to the present application. The absence of metal in the tear-open flap of these membrane lids serves to allow them to be sealed onto the container, which is to be sealed in a trouble-free manner, through inductive heating by means of the sealing layer applied on the membrane lid, as the inducing currents applied during the sealing are not influenced by metal in the tear-open flap.
It is an object of the present invention to provide a process for manufacturing such membrane lids in as simple and as cheap a manner as possible. This object is solved in accordance with the invention by a process of the type initially stated above in that firstly, cut-outs are made in a metallic foil, for example an aluminium foil, wherein the tear-open flaps of the membrane lids to be subsequently cut out of the multi-layered material come to be located within the cut-outs, that a non-metallic layer which consists of a hot-sealable material and/or on the surface of which a layer of hot-sealable material is applied is then laminated onto the metallic foil, and that finally the container lids having tear-open flaps are cut out of the multi-layered material formed in this way in such a manner that the tear-open flaps are formed out of the non-metallic areas of the multi-layered material.
In accordance with a particularly useful embodiment of the inventive process, the cut-outs in the metallic foil are made in such a manner that the edges thereof come to lie at the edges of the membrane lid to be later cut out of the multi-layered material. The membrane lids can be cut out of the multi-layered material together with their tear-open flaps in such a manner that the respective tear-open flaps of several lids are formed out of the areas of the multi-layered material free of metallic foil. In this way, the number of cut-outs to be made in the metallic foil can be reduced.
Additionally, in accordance with the inventive process, differently sized lids having non-metallic tear-open flaps can be cut out of the multi-layered material with the same pattern of the non-metallic areas. Thus, the same cutting tool for making the cut-outs in the metallic foil can be used.
Commonly, the containers closed by means of the membrane lids are additionally closed with a screw cap in which a coated cardboard, or a paper-plastic laminate can be arranged as a secondary seal to enable a tight
reclosing of the container after the removal of the membrane lid. In a useful development of the process, it is provided for that the metallic foil is provided with a layer of cardboard, paper or the like on the side
subsequently facing the screw cap and that the laminating substance used for this only has a small bonding
strength. The membrane lid stamped out of such a
multi-layered material is joined with the inner side of the screw cap in a securely bonded manner. In
subesequently opening the screw cap, the cardboard layer shears off from the actual sealing membrane and remains as a secondary seal in the screw cap.
The laminating substances used for the building-up of the multi-layered material can be selected such that during the first time of opening of the screw cap the separation of the laminate ensues on account of the shearing between the metallic foil and the non-metallic layer sealed onto the rim of the container opening.
In a further useful development of the process, it is provided for that the metallic foil is provided with a layer, for example of cardboard, paper or the like, which is located on an outer side of the multi-layered material, and that a further metallic foil is applied on the
metallic foil prior to the stamping and the laminating of the non-metallic layer. In this case, the laminating material joining the metallic foils can be a laminating substance having a low bonding strength so that a
separation of the metallic foils from one another is made possible by screwing off the screw cap, which is connected with the upper side of the multi-layered material. One of the two metallic foils remains on the container opening, the other remains in the screw cap together with the cardboard laminate and serves as the secondary seal when the container is closed again after the membrane lid is torn off. Particularly advantageous, exemplified embodiments described in the following are shown in the drawings, in which:
Fig. 1 shows the plan view of a metallic foil laminate, having cut-outs made in the first step of the inventive process and in which the broken lines show the lid edges which are subsequently to be cut out;
Fig. 2 shows a section through the metallic foil
laminate along line II-II in Fig. 1 in an enlarged view;
Fig. 3 shows the plan view of the multi-layered material made in the second process step, in which material the hatched areas represent the cut-outs in the metallic foil laminate and the broken lines represent the subsequent outlines of the lids;
Fig. 4 shows a section through the multi-layered
material along line IV-IV in Fig. 3 in an enlarged view;
Fig. 5 shows the plan views of the multi-layered
material shown in Fig. 3 and the membrane lids having a tear-open flap to be cυt out in the last process step;
Fig. 6 shows the section through the multi-layered
material according to Fig. 5 along line VI-VI in Fig. 5; Fig. 7 to 10 show plan views of multi-layered materials having different.lv arranged cut-outs within the metallic foil laminate and the membrane lids including tear-open flaps to be cut out in the last process step;
Fig. 11 shows a plan view of a further multi-layered
material with membrane lids of different sizes to be cut out of this in the last process step with tear-open flaps free of metal.
Fig. 1 shows a metallic foil laminate 12 in which cut-outs 11 are made in accordance with the first step of the process according to the invention, wherein the tear-open flaps 2 of the membrane lids 1 (shown with broken lines) to be later cut out of the multi-layered material comes to be located within the cut-outs 11. The metallic foil laminate 12 consists of a metallic foil 9 which, as may be seen in Fig. 2, is joined by means of a laminating substence 8 to cardboard 6.
Fig. 3 shows the plan view of the multi-layered material manufactured in the second process step by laminating a plastic foil laminate 13 onto the metallic foil laminate 12. The areas 16 of this multi-layered material within which the cut-outs 11 covered by the plastic foil laminate are located are shown by means of hatching.
As shown in Fig. 4 , the plastic foil laminate 13 consists of a plastic foil 7 and a layer of hot-sealable material 10 applied thereto. By means of the plastic foil 7, this laminate 13 is laminated onto the metallic foil 9 of the metallic foil laminate 12 with the aid of a laminating subsance 8 in the second process step. The hot-seal layer 10 serves for the subsequent sealing of the membrane lid to the multi-layered material which is to be cut out.
It may be seen in Fig. 5 that the membrane lids 1 having a tear-open flap are cut out of the multi-layered material according to Fig. 3 in such a manner that the tear-open flaps of three membrane lids are respectively formed out of one of the areas 16 of the multi-layered material which is free of metal.
The multi-layered materials depicted in Figs. 7 to 10 show differently arranged areas 16 free of metal out of which a different number of tear-open flaps are formed in the final process step. In this case, the membrane lids according to Figs. 9 and 10 respectively have a second tear-open flap which is to be formed.
If required, the number of tear-open flaps can be increased even further by appropriately arranging the blanks.

Claims

C L A I M S :
1. Process for manufacturing membrane lids consisting of a multi-layered material having at least one metallic layer for sealing containers, the membrane lids having at least one tear-open flap free of metal projecting out from the periphery of the container, characterized in that a) firstly, cut-outs (11) are made in a metallic foil (9), in the areas of the cut-outs of which the tear-open flaps (2) of the membrane lids (1) to be subsequently cut out of the multi-layered material come to be located; b) a non-metallic layer which consists of a
hot-sealable material and/or on the surface of which a layer of hot-sealable material (10) is applied is then laminated onto the metallic foil (9); and c) finally, the membrane lids (1) having at least one tear-open flap (2) are cut out of the multi-layered material formed in this way in such a manner that the tear-open flaps are formed out of the surface areas (16) of the multi-layered material which are free of metallic foil.
2. Process according to claim 1, characterized in that the cut-outs (11) in the metallic foil (9) are made in such a manner that the edges thereof are located at the edge of the membrane lids (1) to be subsequently cut out of the multi-layered material.
3. Process according to claim 1, characterized in that the membrane lids (1) having their tear-open flaps (2) are cut out of the multi-layered material in such a manner that the respective tear-open flaps (2) of several lids (1) are formed out of the areas (16) of the multi-layered material which are free of metallic foil.
4 . Process according to claim 1, characterized in that for the same pattern of the area (16) free of metal, differently sized lids (1) having non-metallic tear-open flaps (2) are cut out of the multi-layered material.
5. Process according to claim 1, characterized in that the metallic foil (9) is provided with a layer, for example of cardboard (6), paper or the like, which is located on one side of the multi-layered material.
6. Process according to claim 1, characterized in that a further metallic foil (9) is applied onto the metallic foil (9) before the cutting out of the cut-outs and the laminating of the non-metallic layer.
7. Process according to claim 6, characterized in that a laminating substance having a low bonding strength is used as the laminating substance for bonding the two metallic layers (9).
8. Process according to claim 5, characterized in that a laminating substance having a low bonding strength is used as the laminating substance for bonding the cardboard layer with the metallic foil.
9. Process according to claim 1, characterized in that a laminating substance having a low bonding strength is used as the laminating substance between the metallic foil and the non-metallic layer.
PCT/EP1990/002254 1989-12-19 1990-12-19 Process for manufacturing membrane lids for sealing containers WO1991008898A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89123474.2 1989-12-19
EP89123474A EP0433475A1 (en) 1989-12-19 1989-12-19 Process for the manufacture of membrane-type covers for sealing receptacles

Publications (1)

Publication Number Publication Date
WO1991008898A1 true WO1991008898A1 (en) 1991-06-27

Family

ID=8202249

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/002254 WO1991008898A1 (en) 1989-12-19 1990-12-19 Process for manufacturing membrane lids for sealing containers

Country Status (5)

Country Link
EP (1) EP0433475A1 (en)
AU (1) AU7069191A (en)
NZ (1) NZ236421A (en)
WO (1) WO1991008898A1 (en)
ZA (1) ZA909779B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0305104D0 (en) * 2003-03-06 2003-04-09 Relco Uk Ltd Sealing Arrangement
US20080073308A1 (en) * 2006-09-25 2008-03-27 Yousif Paul E Tabbed container seal and method of manufacture
FR2943322B1 (en) * 2009-03-18 2011-05-13 Joints Manuf Generale TAPPED SEAL FOR CAPTURING A CLOSURE CONTAINER BY CAP OR CAPSULE AND METHOD FOR MANUFACTURING THE SAME

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946739A1 (en) * 1978-11-24 1980-05-29 Tetra Pak Int LAYERED LAMINATED PACKAGING MATERIAL AND METHOD FOR THE PRODUCTION THEREOF
EP0040797A1 (en) * 1980-05-28 1981-12-02 Zweckform Werk GmbH Laminated cover for a container mouth
US4381848A (en) * 1981-07-01 1983-05-03 Reynolds Metals Company Membrane closure structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946739A1 (en) * 1978-11-24 1980-05-29 Tetra Pak Int LAYERED LAMINATED PACKAGING MATERIAL AND METHOD FOR THE PRODUCTION THEREOF
EP0040797A1 (en) * 1980-05-28 1981-12-02 Zweckform Werk GmbH Laminated cover for a container mouth
US4381848A (en) * 1981-07-01 1983-05-03 Reynolds Metals Company Membrane closure structure

Also Published As

Publication number Publication date
NZ236421A (en) 1992-08-26
AU7069191A (en) 1991-07-18
EP0433475A1 (en) 1991-06-26
ZA909779B (en) 1991-10-30

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