CA1036920A - Method for the manufacture of laminate webs with firm edge strip - Google Patents

Method for the manufacture of laminate webs with firm edge strip

Info

Publication number
CA1036920A
CA1036920A CA233,527A CA233527A CA1036920A CA 1036920 A CA1036920 A CA 1036920A CA 233527 A CA233527 A CA 233527A CA 1036920 A CA1036920 A CA 1036920A
Authority
CA
Canada
Prior art keywords
layer
coating material
base layer
adhesion
web
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.)
Expired
Application number
CA233,527A
Other languages
French (fr)
Inventor
Ragnar Mandersson
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.)
Ziristor AB
Original Assignee
Ziristor AB
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 Ziristor AB filed Critical Ziristor AB
Application granted granted Critical
Publication of CA1036920A publication Critical patent/CA1036920A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
    • B26D1/03—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/065—Layered 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 foam
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/10—Layered 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
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered 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
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • 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
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Laminated Bodies (AREA)
  • Making Paper Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

ABSTRACT OF THE DISCLOSURE
The present invention provides a method for the manufac-ture of laminate webs, each of which comprises a central base layer, with layers of coating material applied to either side thereof, one of which extends beyond one edge of the web and forms a firm strip which comprises passing a laminated material compris-ing said base layer and one said layer of coating material through a first set of cutting elements which divide the material into parallel webs simultaneously and jointly covering the parallel webs with said second layer of coating material, each web being provided with an adhesion-free zone situated adjacent the one web edge in which zone the layer of coating material is unattached to the base layer passing the webs by a second set of cutting elements, which cut through the second layer of coating material (2) in the boundary line of each adhesion-free zone facing away from the said web edge.

Description

The present invention relates to a method for the manufacture of laminate webs, each of which comprises a central base layer with layers of coating material applied to either side, one of which extends beyond one edge of the web and forms a firm strip.
Several different types of disposable packages for liquid filling materials, e.g. milk, are known, The packages are usually made of a laminated material which comprises a base layer of paper and layers of thermoplastic ma-terial applied on either side thereof. A known type of package is manufactured so, that a web of laminated material, stored in the form of a roll, is folded over during its downward movement through a packing machine to tubular shape, whereupon the overlapping edge zones of the web are sealed to one another and the filling material is filled in via a filler pipe extending downwards into the tube.
During continued downward movement, the tube filled with filling material is transversely sealed by sealing jaws, which, with simultaneous supply of heat, press together the tube walls so that a joint impervious to liquid is produced between the individ-ual, still connected, packages. After a possible further shapingprocess, the sealed tube is divided up into individual finished packages by cutting through the said transverse sealing zones.
The longitudinal joint formed at the folding over of the - material web to a tube has the form of a lap joint, which means that one edge of the web is situated inside the tube. Since the porous base layer of the laminate is exposed at the edge, filling material will be sucked up into the base layer, unless measures - are taken to prevent this. Until now the problem has been solved by covering up the exposed cut edge with a loose plastic strip, which is applied over the joint on the inside of the tube directly after the formation of the joint. It was found that this loose plastic strip prevents in a satisfactory manner the penetration of - 1 - - ,~

the liquid contents into the base layer, but the placing of the plastic strip involves an extra, undesirable operational stage in the manufacture of the packages. Moreover it makes necessary a strip placing device and various other elements which increase the risk of breakdowns.
One method for overcoming the problem of the loose strip comprises providing the material web with a so-called firm strip during the manufacture of the laminated material which is to be used in the packing machine, that is to say, allowing one coating material layer of the laminate to extend beyond the base layer at the one edge of the laminate web. Since the laminate webs, which are manufactured in the laminating machines are several times wider than the material webs which are to be used in the packing machine, the original webs have to be divided into a number of narrower webs, whose width is adapted to the packing machines in which they are to be used. It is not possible therefore to produce the firm strip before, at the earliest, the division of -~ the original wide laminate web into narrower webs. Until now it has not been possible, howeYer, in an effective and economical manner to provide the separate webs with a firm strip, and the methods known until now comprise either the fitting of a separate strip or the cutting off of parts of the base layer so that unnecessary waste is produced.
The present invention provides a method for providing a laminate web with firm edge strip, which method is simple and ~,~ economical and can be carried out at the same time as the necessary division of the original material into narrower webs.
According to the present invention, a laminated material, comprising the base layer and one layer of coating material, is passed through a first set of cutting elements which divide the material into parallel webs, the parallel webs are jointly covered with the second layer of coating material, each web being provided :, -10369;~0 with an adhesion-free zone situated next to the one web edge, in which zone the layer of coating material is inhibited from becoming attached to the base layer, that the webs are to pass a second set of cutting elements which cut through the second layer of coating material in the boundary line of each adhesion-free zone facing away from the said web edge.
According to the present invention therefore there is provided a method for the manufacture of laminate webs each of which comprises a central base layer, with layers of coating material applied to either side thereof, one of which extends beyond one edge of the web and forms a firmstripwhich comprises passing a laminated material comprising said base layer and one said layer of coating material through a first set of cutting elements which divide the material into parallel webs simultan-eously and jointly covering the parallel webs with said second layer of coating material, each web being provided with an adhesion-free zone situated adjacent the one web edge in which zone the layer of coating material is unattached to the base layer passing ; the webs by a second set of cutting elements, which cut through the second layer of coating material (2) in the boundary line of each adhesion-free zone facing away from the said web edge.
In one embodiment of the invention the adhesion-free zones are achieved by the application of an adhesion-inhibiting substance.
In another embodiment of the present invention the adhesion-free zones are achieved in that the second layer of coating material during its application is pressed down against the base layer by means of lamination rollers provided with an all-round groove.
The present invention will be further illustrated by way of the accompanying drawings in which, Fig. 1 is a lap joint in an enlarged scale of the ,, 10;~69Z~
type which is produced on joining together laminate webs manufac-tured in accordance with one embodiment of the invention.
Fig. 2 shows schematicall~ a view of the laminated material during the execution of the method in accordance with the invention.
The overlap joint shown in Fig. 1 is of the same type as the longitudinal joint formed in the conventional process described heretofore, when, in the manufacture of individual packing containers, the laminated material web is folded over to tubular shape. The upper side of the laminate in Fig 1 constitutes the inside of the tube. The laminate is conventional and comprises a central base layer 1 and layers of coating material 2 and 3 applied to either side of the same. On the material edge situated inside the tube extends a strip 4 of the layer of coating material
2 beyond the edge of the base layer 1. The strip 4 is joined, during the formation of the lap joint, to the layer of coating material 2 in the other edge region of the material web, and there-by prevents any contact of the liquid contents with the base layer 1. The longitudinal joint is produced in that the edge regions of the material web are placed on top of one another, whereupon the layers of coating ma~erial lying against one another in the regions 5 and 6 are fused together by pressing and heating, and form a durable seal. To make possible the abovementioned sealing operation, the layers of coating material 2 and 3 must comprise a heat-fusible material, e.g. polyethylene, but it is understood that each layer may also include other material layers, e.g. an aluminium foil, which on both sides is surrounded by a heat-fusible material.
Fig. 2 illustrates the method in accordance with one embodiment of the invention, where during the manufacture and div-ision of a laminate web into a number of individual webs, at the same time, the strip of the one layer of coating material extending 10;~692(:J
beyond the base layer of the laminate is prduced. For the sake of clarity various details have been muted. Examples of such details are extruding devices, guide rollers, laminating rollers and roller stands which may all be of the conventional type. The material moves during the course of the operation from left to ; right, that is to say in the direction of the arrow in Figure 2.
On the left in the Figure can be seen the undivided, laminated material 7 as delivered from a lamination device. The material 7 in this stage consists only of the base layer 1 and the layer of coating material 3 applied to the underside of the same (Fig.
1). Directly after delivery from the lamination device the lamin-ated material 7 passes a first set of cutting elements 8, which is arranged transversely in relation to the direction of movement of the web. The cutting elements 8 may consist of rotating roller cutters, which, in co-operation with an element located underneath the material web (not shown), completely cut through the material and divide the same into narrower, parallel webs. During the continued feed of the material and the method in accordance with the invention the parallel webs run the whole time alongside one another and in a common plane.
The next stage in the method in accordance with the invention consists in the production of an adhesion-free zone next to the one web edge on the base layer of each web. The adhesion-free zone 9 is produced e.g. by applying an adhesion-inhibiting substance, e.g. wax or silicon compounds, is applied to the base layer 1 in the form of a border of the desired width.
The application device for the adhesion-inhibiting substance is of the known type and is not shown.
After the application of the adhesion-inhibiting sub-stance, the laminate webs running alongside one another aresimultaneously provided with the common top layer of coating material 2. This is achieved by means of an extruding device /

10369ZC~
arranged transversely abovethe webs, by means of which a heated mass of plastic material is extruded under pressure through a nozzle to form a coherent film which, by means of a pair of laminating rollers arranged thereafter, is attached to the base layer 1 and the earlier applied layer of coating material 3.
After this application the previously separate webs are now joined together by means of the common layer of coating material 2.
With continued feeding, the material passes a second set of cutting elements 10, which comprises a plurality of roller cutters arranged transversely in relation to the direction of movement of the material. In contrast to what was the case in the first set of cutting elements 8, this second set of cutting elements 10 does not cut through the whole thickness of the mater-ial, but merely divides the upper layer of material 2 into parallel webs. In relation to the first cutting elements 8 the cutting elements 10 are somewhat displaced in lateral direction, which means that the parallel cuts in the layer of coating material 2 will run at some distance alongside the cuts made earlier in the base layer 1 and the layer of coating material 3. The size of this displacement corresponds, more closely defined, to the width of the adhesion-free zone 9, in which the layer of coating material 2, which has been applied, does not stick to the base layer 1.
By virtue of the two cuts and the adhesion-free zone, the material is divided up again into separate webs, each of which is provided with a firm strip 4, that is to say a projecting edge of the top layer of coating material 2. Finally the webs are rolled up, each by itself, by means of rolling-up arrangements not shown.
The method in accordance with the invention is shown in Figure 2 in an especially compressed manner and in the actual plant the distance from the first lamination arrangement to the rolling-up station is of a considerable length, since various arrangements not shown on the drawing will have to be accomodated 10369~0 along the manufacturing train. For reasons of space and accessi-bility the webs do not always run irl a straight iine, but are guided in a suitable manner by means of rollers. It is essential, however, that at least during the application of the top layer of coating material 2 they should run in a common plane.
Various modifications of the dimensions are of course possible. Thus e.g. the width of the individual laminate webs may be modified through a lateral displacement of the cutting elements 8. It is also possible at the same time to divide the material into laminate webs of unequal width. A lateral displace-ment of the cuttingelements8requires, however, a corresponding lateral displacement of the cutting elements 10. Naturally it is also possible to vary the width of the firm strip by laterally displacing the cutting elements 10 in relation to the cutting elements 8.
The adhesion-free zones of the material can also be achieved in different conventional manners. Instead of applying a border of an adhesion-inhibiting agent to the base layer of the material, it is possible e.g. to provide the lamination roller which completes the application of the top layer 2 with all-round grooves, the width and placing of which correspond to the desired width and placing of the adhesion-free zones. As a result of this the layer of coating material 2 is not pressed against the base layer 1 in these regions, and zones with little or no adhesion between the layer 2 and the base layer 1 are produced.
The base layer may consist of foamed plastic or fibrous material, e.g. paper, and the layers of coating material may consist of homogeneous plastic or an aluminium foil surrounded on both sides by homogeneous plastic material.
At the joining together of both edge regions of a laminate web in a lap joint for the formation of the longitudinal joint in a tube, the edge region 11 (Fig. 1) situated on the /

$

1~3G9;~0 outside of the tube is not joined at all, or joined only with an easily breakable seal, to the outer layer of coating material
3 at the heat-sealing, since the outer material edge lacks the part of the inner, heat-sealable layer of coating material 2 corresponding to the strip 4. This is an advantage in cases where a tearing thread for the opening of the package extends through the joint since the loose edge will then serve as a guide for the tearing thread.
By the method in accordance with the invention it is possible therefore, together with the manufacture of the laminated material, to divide the same into narrower, separate webs and provide each of these with a firm strip without any material being wasted.

~'

Claims (7)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for the manufacture of laminate webs each of which comprises a central base layer with layers of coat-ing material applied to either side thereof, one of which extends beyond one edge of the web and forms a firm strip which comprises passing a laminated material comprising said base layer and one said layer of coating material through a first set of cutting elements, which divide the material into parallel webs simultaneously and jointly covering the parallel webs with said second layer of coating material, each web being provided with an adhesion-free zone situated adjacent the one web edge in which zone the layer of coating material is unattached to the base layer passing the webs by a second set of cutting elements, which cut through the second layer of coating material (2) in the boundary line of each adhesion-free zone facing away from the said web edge.
2. A method in accordance with claim 1, in which the adhesion-free zones are achieved by the application of an adhesion-inhibiting substance.
3. A method in accordance with claim 1, in which the adhesion-free zones are achieved in that the second layer of coating material during its application is pressed down against the base layer by means of lamination rollers provided with an all-round groove.
4. A method as claimed in claim 1, 2 or 3 in which, the layers of coating material consist of homogeneous plastic material.
5. A method as claimed in claim 1, 2 or 3 in which at least one of the layers of coating material consists of an aluminium foil surrounded on both sides by homogeneous plastic material.
6. A method as claimed in claim 1, 2 or 3 in which the base layer consists of foamed plastic.
7. A method in accordance with claim 1, 2 or 3 in which the base layer consists of fibrous material.
CA233,527A 1974-08-15 1975-08-15 Method for the manufacture of laminate webs with firm edge strip Expired CA1036920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7410402A SE380196B (en) 1974-08-15 1974-08-15 WAY TO MANUFACTURE LAMINATE YEARS WITH FIXED EDGE BELT

Publications (1)

Publication Number Publication Date
CA1036920A true CA1036920A (en) 1978-08-22

Family

ID=20321897

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Application Number Title Priority Date Filing Date
CA233,527A Expired CA1036920A (en) 1974-08-15 1975-08-15 Method for the manufacture of laminate webs with firm edge strip

Country Status (10)

Country Link
JP (1) JPS5841175B2 (en)
CA (1) CA1036920A (en)
CH (1) CH599857A5 (en)
DE (1) DE2536266C3 (en)
FR (1) FR2281831A1 (en)
GB (1) GB1467700A (en)
IT (1) IT1040293B (en)
NL (1) NL184463C (en)
SE (1) SE380196B (en)
SU (1) SU772476A3 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8204725A (en) * 1982-12-07 1984-07-02 Mako Bv WASTE CONTAINER, METHOD AND APPARATUS FOR MANUFACTURING SUCH A CONTAINER AND COVER ACCOMPANYING THE CONTAINER.
GB2138356B (en) * 1983-03-23 1986-10-08 Flexwatt Corp Heater manufacturing
GB8713769D0 (en) * 1987-06-12 1987-07-15 May & Baker Ltd Compositions of matter
FR2595295A1 (en) * 1986-03-07 1987-09-11 Monoplast Sa Laminated sheet, especially for packaging
CH680724A5 (en) * 1991-03-06 1992-10-30 Lamibox Ag C O Dres Reichlin &
DE4205249C2 (en) * 1992-02-21 1993-11-25 Hans Hagner Manufacturing process for a composite film
CA2097642A1 (en) * 1993-03-19 1994-09-20 Jerry Malin Method and apparatus for fabricating a rubberized wire sheet
DK1184311T3 (en) * 2000-08-31 2005-01-17 Tetra Laval Holdings & Finance Method of assembling laminated material for packaging of pourable foods
EP1764213A1 (en) * 2005-09-14 2007-03-21 Bobst S.A. Packaging material, blank and container for liquid and processes for their manufacture
CN111605173A (en) * 2020-04-24 2020-09-01 张家刘 High-temperature-resistant plastic bag and preparation method thereof

Also Published As

Publication number Publication date
SU772476A3 (en) 1980-10-15
AU8379875A (en) 1977-02-10
DE2536266C3 (en) 1979-03-01
JPS5146374A (en) 1976-04-20
DE2536266B2 (en) 1976-11-11
FR2281831A1 (en) 1976-03-12
NL7509235A (en) 1976-02-17
IT1040293B (en) 1979-12-20
JPS5841175B2 (en) 1983-09-10
SE380196B (en) 1975-11-03
DE2536266A1 (en) 1976-03-04
NL184463B (en) 1989-03-01
FR2281831B1 (en) 1980-07-11
NL184463C (en) 1989-08-01
CH599857A5 (en) 1978-05-31
GB1467700A (en) 1977-03-16

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