AU2012200614A1 - A multilayer product and method for producing same by perforating heat-fusible material - Google Patents
A multilayer product and method for producing same by perforating heat-fusible material Download PDFInfo
- Publication number
- AU2012200614A1 AU2012200614A1 AU2012200614A AU2012200614A AU2012200614A1 AU 2012200614 A1 AU2012200614 A1 AU 2012200614A1 AU 2012200614 A AU2012200614 A AU 2012200614A AU 2012200614 A AU2012200614 A AU 2012200614A AU 2012200614 A1 AU2012200614 A1 AU 2012200614A1
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- Australia
- Prior art keywords
- heat
- layers
- product according
- fusible
- absorbent
- Prior art date
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- Abandoned
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- 239000000463 material Substances 0.000 title claims abstract description 144
- 238000004519 manufacturing process Methods 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000002745 absorbent Effects 0.000 claims description 70
- 239000002250 absorbent Substances 0.000 claims description 70
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 5
- 239000012768 molten material Substances 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000012943 hotmelt Substances 0.000 claims description 4
- 239000002984 plastic foam Substances 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 71
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Abstract
5 The present invention relates to a multilayer product which has holes in its heat fusible material layer and a product produced by a method for making holes in heat-fusible material. 8 Fig.1 Fig.2
Description
Pool Section 2 Regulation 3.2(2) AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Application Number: Lodged: Invention Title: A multilayer product and method for producing same by perforating heat-fusible material The following statement is a full description of this invention, including the best method of performing it known to us: P1 11AHAUI0710 1 A multilayer product and method for producing same by perforating heat-fusible material TECHNICAL FIELD The present invention relates to a multilayer product which has holes in its heat-fusible material 5 layer and a product produced by a method for making holes in heat-fusible material. BACKGROUND ART Layers with patterns of through-holes or perforations form part of many industrial products, such as the layer nearest to the wound surface in wound dressings, for example. A common method of 10 producing the pattern of holes is to punch the holes out. One problem with punching is dealing with the waste, that is to say the parts which in punching are pressed out of the material, and to ensure than none of the waste ends up in the finished product. This problem is accentuated by the fact that the perforating process must be performed rapidly so that the speed of the processing line is not limited by the perforating process. 15 It is desirable that the present invention solves this problem. DISCLOSURE OF INVENTION In a first aspect there is provided a product produced by a process including: 20 bringing together one or more layers of absorbent material and at least one layer of heat-fusible material; and feeding the layers which have been brought together through a device for localised heating of the heat-fusible material so that the heat-fusible material melts, forming holes in the heat-fusible material, and so that molten material is absorbed in the absorbent material. 25 According to one preferred embodiment the process further includes removing one or more layers of absorbent material from the layer of heat-fusible material. In another preferred embodiment before the localised heating of the heat-fusible material, one or 30 more layers of material are applied to the layer of heat-fusible material on an opposite side to the side in contact with the one or more layers of absorbent material. In another preferred embodiment before the localised heating of the heat-fusible material, one or more layers of material are applied to the one or more layers of absorbent material on an opposite 35 side to the side in contact with the layer of heat-fusible material. In still another preferred embodiment the at least one heat-fusible material layer and the one ur more layers of absorbent material layer are joined together with holes being created in the one or more layers of absorbent material. 40 2 Each layer may be made up of a web of material. In yet another preferred embodiment the one or more layers of absorbent material are two folded layers of absorbent non-woven material. 5 In still yet another preferred embodiment the localised heating is done by means of an ultrasonic device. The product may take the form of an operating theatre towel. 10 In a second aspect of the invention there is provided a product having at least one layer of heat fusible material with holes formed therein and one or more layers of absorbent material, the one or more layers of absorbent material joined to the heat-fusible material in an area of each hole bottom by absorption of heat-fused material from each hole in said heat-fusible material into said 15 one or more layers of absorbent material. According to one preferred embodiment of this aspect of the invention the at least one heat-fusible material layer and the one or more absorbent material layers are joined together without holes being created in the one or more layers of absorbent material. 20 In another preferred embodiment of this aspect of the invention the at least one heat-fusible material layer and the one or more absorbent material layers are joined together with holes being created in the one or more layers of absorbent material. 25 In another preferred embodiment of this aspect of the invention the product has one or more layers of material applied to the layer of heat-fusible material on the opposite side to the side in contact with the one or more layers of absorbent material and/or the product has one or more layers of material applied to the one or more layers of absorbent material on the opposite side to the side in contact with the layer of heat-fusible material. 30 Each layer may be made up of a web of material in this aspect. In yet another embodiment of this aspect of the invention the one or more layers of absorbent material are two folded layers of absorbent non-woven material. 35 The heat-fusible material is preferably composed of non-woven material of thermoplastic fibres or other heat-fusible materials. It may be selected from the group consisting of plastic film, plastic foam and hot-melt or other fusible adhesive. The plastic may be polypropylene (PP), polyethylene (PE) or polyurethane (PU). 40 3 The absorbent material is preferably composed of paper, absorbent foam or non-woven material composed of or containing absorbent fibres. In still yet another preferred embodiment the localised heating is done by means of an ultrasonic 5 device. The product may take the form of an operating theatre towel. BRIEF DESCRIPTION OF DRAWINGS 10 The invention will be described with reference to the drawings attached, of which: Fig. 1 schematically illustrates an embodiment of the method according to the invention for making holes in heat-fusible material, and 15 Fig. 2 in schematic form shows an absorbent layer partially removed from a perforated layer. Fig. 2 also shows a cut-away view of an embodiment of the product according to the invention. PREFERRED EMBODIMENT Fig. 1 schematically illustrates a preferred embodiment of the method according to the invention in 20 its simplest form. On a processing line a web 1 of heat-fusible material is unwound from a first storage reel and is brought together with a web 2 of absorbent material, which has been unwound from a second storage reel. A second web 3 of absorbent material is then applied on top of the web 1. The united webs 1, 2, 3 then pass through the nip in an ultrasonic device 4, which comprises an ultrasonic horn 5 and a counter-roller 6. The counter-roller 6 is provided with a 25 pattern of protuberances. The energy emitted from the ultrasonic device is adjusted so that as the webs 1, 2, 3 pass through the device a localised melting of the material of the web 1 occurs in the area of each protuberance on the counter-roller, so that a hole is formed in the web. The molten material from each hole is absorbed in the layer of absorbent material in the webs 2 and 3. The united web 1, 2, 3 then passes through a cooling device 7 in order to ensure that the material in 30 the hole walls sets. The webs 2 and 3 are then drawn off from the web 1 and wound up onto reels 8 and 9 respectively. The perforated web 1 continues on the processing line for the manufacture of a product comprising a layer of perforated or holed material, such as a bottom layer in a wound dressing, for example. 35 Since the molten material from each hole is absorbed in the absorbent material in the webs 2 and 3, all waste occurring in the perforating process will be bound in the web 2 of absorbent material. No loose waste will therefore occur. The localised heat generated by the ultrasonic device will also be dissipated to the hole walls so 40 that these soften. Once the united web 1, 2, 3 leaves the ultrasonic device, the material will cool, 4 so that the absorbent material in the webs 2, 3 will be joined to the material in the web I in the areas around each hole in the web 1. These joints are broken when the webs 2, 4 are drawn off from the web 1. The webs 2, 3 removed will therefore have a pattern of rings of fusible material corresponding to the pattern of holes in the web 1, as is illustrated schematically in Fig. 2 for the 5 web 2. The mechanical processing of the absorbent layer in the area of each hole bottom furthermore causes the absorbent material to be compressed in these areas which can lead to the capillaries in the absorbent material becoming smaller and thereby rapidly saturated, so that most of the molten material which disappears from each hole is taken up in the absorbent material in the areas outside the holes. 10 The web 1 of heat-fusible material may be composed of plastic film, plastic foam, hot-melt or other fusible adhesive. The web 1 may also be composed of non-woven material of thermoplastic fibres or other heat-fusible materials, which for any reason it is desirable to provide with a pattern of holes. The plastic materials used may be polypropylene (PP), polyethylene (PE) or polyurethane 15 (PU), for example. The webs 2, 3 of absorbent material may be composed of paper, absorbent foam or non-woven material, composed of or containing absorbent fibres. Other absorbent materials may also be used. 20 The ultrasonic device may be of conventional type, from Dukane, USA or Branson, USA, for example. The method according to the invention also allows the manufacture of multilayer products having 25 a perforated layer and one or more superimposed or underlying layers. Because a superimposed and/or underlying layer, such as the absorbent layers 2, 3 in the embodiment according to Fig. 1, are joined to the perforated layer in the areas around the holes, it is therefore possible, in performing the method, simultaneously to achieve a perforation of one layer and a lamination of superimposed and/or underlying layers. By selecting plastic material with various melting points, 30 superimposed or underlying layers can be joined together without holes occurring in these materials. It is naturally also possible to make holes in two or more layers. By means of the method it is therefore possible in one and the same operation to produce holes in an adhesive layer and to join a superimposed layer of absorbent foam to the adhesive layer and a superimposed sealing layer of plastic film. 35 An example of a product produced according to the method of the present invention is an operating theatre towel for drying up blood and other fluids. In one advantageous embodiment such a towel comprises two folded layers of absorbent non-woven material and an intermediate plastic layer. The method according to the invention allows the intermediate plastic layer to be 5 perforated whilst the two layers of absorbent material are simultaneously joined to the intermediate layer. In ultrasonic heating the amount of heat emitted will be greatest at the centre of the layer(s) of 5 material situated between the ultrasonic horn and the counter-roller, which is one reason why in the exemplary embodiment described two absorbent layers 2, 3 are preferably used. This is not essential, however. To this end, it is possible to some extent to control the heating of the material layer by using further layers of material, placed over or under the layer(s) to be perforated or joined to a perforated layer, in order to shift the centre. 10 The embodiments described can naturally be modified without departing from the scope of the invention. For example, other heat sources capable of producing localised heating of the heat fusible layer can be used for perforation. In such an application it is preferable to use only one absorbent layer applied to the side of the heat-fusible layer remote from the heat source. Through 15 suitable design of the protuberances on the counter-roller, the holes made may be of shapes other than a circular shape, for example oval or rectangular. The invention must therefore be limited only by the content of the patent claims attached.
Claims (27)
1. A product produced by a process including: bringing together one or more layers of absorbent material and at least one layer of heat fusible material; and feeding the layers which have been brought together through a device for localised heating of the heat-fusible material so that the heat-fusible material melts, forming holes in the heat-fusible material, and so that molten material is absorbed in the absorbent material.
2. A product according to claim 1 wherein the process further includes removing one or more layers of absorbent material from the layer of heat-fusible material.
3. A product according to claim I or 2 wherein before the localised heating of the heat fusible material, one or more layers of material are applied to the layer of heat-fusible material on an opposite side to the side in contact with the one or more layers of absorbent material.
4. A product according to any one of the preceding claims wherein before the localised heating of the heat-fusible material, one or more layers of material are applied to the one or more layers of absorbent material on an opposite side to the side in contact with the layer of heat-fusible material.
5. A product according to any one of the preceding claims wherein the at least one heat fusible material layer and the one or more layers of absorbent material layer are joined together with holes being created in the one or more layers of absorbent material.
6. A product according to any one of the preceding claims wherein each layer is made up of a web of material.
7. A product according to any one of the preceding claims wherein the one or more layers of absorbent material are two folded layers of absorbent non-woven material.
8. A product according to any one of claims 1-7 wherein the heat-fusible material is composed of non-woven material of thermoplastic fibres or other heat-fusible materials.
9. A product according to any one of the preceding claims wherein the heat-fusible material is selected from the group consisting of plastic film, plastic foam and hot-melt or other fusible adhesive. 7
10- A product according to claim 9 wherein the plastic may be any one or more of polypropylene (PP) and polyurethane (PU).
11. A product according to any one of claims 1-10 wherein the absorbent material is composed of paper, absorbent foam or non-woven material composed of or containing absorbent fibres.
12. A product according to any one of the preceding claims wherein the localised heating is done by means of an ultrasonic device.
13. A product according to any one of the preceding claims wherein the product is an operating theatre towel.
14. A product having at least one layer of heat-fusible material with holes formed therein and one or more layers of absorbent material, the one or more layers of absorbent material joined to the heat-fusible material in an area of each hole bottom by absorption of heat-fused material from each hole in said heat-fusible material into said one or more layers of absorbent material.
15. A product according to claim 14 wherein the at least one heat-fusible material layer and the one or more absorbent material layers are joined together without holes being created in the one or more layers of absorbent material.
16. A product according to claim 14 wherein the at least one heat-fusible material layer and the one or more absorbent material layers are joined together with holes being created in the one or more layers of absorbent material.
17. A product according to any one of claims 14-16 having one or more layers of material applied to the layer of heat-fusible material on the opposite side to the side in contact with the one or more layers of absorbent material.
18. A product according to any one of claims 14-17 having one or more layers of material applied to the one or more layers of absorbent material on the opposite side to the side in contact with the layer of heat-fusible material.
19. A product according to any one of claims 14-18 wherein each layer is made up of a web of material.
20. A product according to any one of claims 14-19 wherein the one or more layers of absorbent material are two folded layers of absorbent non-woven material. 8
21. A product according to any one of claims 14-20 wherein the heat-fusible material is composed of non-woven material of thermoplastic fibres or other heat-fusible materials,
22. A product according to any one of claims 14-21 wherein the heat-fusible material is selected from the group consisting of plastic film, plastic foam and hot-melt or other fusible adhesive.
23. A product according to claim 22 wherein the plastic may be any one or more of polypropylene (PP) and polyurethane (PU).
24. A product according to any one of claims 14-23 wherein the absorbent material is composed of paper, absorbent foam or non-woven material composed of or containing absorbent fibres
25. A product according to any one of claims 14-24 wherein the localised heating is done by means of an ultrasonic device.
26. A product according to any one claims 14-25 wherein the product is an operating theatre towel.
27. A product substantially as hereinbefore described with reference to one or more of the accompanying drawings. MOLNLYCKE HEALTH CARE AB WATERMARK PATENT & TRADE MARK ATTORNEYS
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2012200614A AU2012200614A1 (en) | 2005-12-16 | 2012-02-03 | A multilayer product and method for producing same by perforating heat-fusible material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0502791-7 | 2005-12-16 | ||
| AU2012200614A AU2012200614A1 (en) | 2005-12-16 | 2012-02-03 | A multilayer product and method for producing same by perforating heat-fusible material |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2006325538A Division AU2006325538B2 (en) | 2005-12-16 | 2006-11-08 | Method for perforating heat meltable material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2012200614A1 true AU2012200614A1 (en) | 2012-02-23 |
Family
ID=45812385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2012200614A Abandoned AU2012200614A1 (en) | 2005-12-16 | 2012-02-03 | A multilayer product and method for producing same by perforating heat-fusible material |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2012200614A1 (en) |
-
2012
- 2012-02-03 AU AU2012200614A patent/AU2012200614A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK4 | Application lapsed section 142(2)(d) - no continuation fee paid for the application |