WO2011016077A1 - Method for producing a multilayer material. multilayer material and article provided with fastening means comprising said material - Google Patents

Method for producing a multilayer material. multilayer material and article provided with fastening means comprising said material Download PDF

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Publication number
WO2011016077A1
WO2011016077A1 PCT/IT2010/000356 IT2010000356W WO2011016077A1 WO 2011016077 A1 WO2011016077 A1 WO 2011016077A1 IT 2010000356 W IT2010000356 W IT 2010000356W WO 2011016077 A1 WO2011016077 A1 WO 2011016077A1
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WO
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Patent type
Prior art keywords
material
characterized
layers
layer
fabric
Prior art date
Application number
PCT/IT2010/000356
Other languages
French (fr)
Inventor
Marco Marzi
Original Assignee
Marco Marzi
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

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56Supporting or fastening means
    • A61F13/5622Supporting or fastening means specially adapted for diapers or the like
    • A61F13/565Supporting or fastening means specially adapted for diapers or the like pants type diaper
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577Apparatus or processes for manufacturing
    • A61F13/15699Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577Apparatus or processes for manufacturing
    • A61F13/15756Applying tabs, strips, tapes, loops; Knotting the ends of pads
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56Supporting or fastening means
    • A61F13/5622Supporting or fastening means specially adapted for diapers or the like
    • A61F13/5633Supporting or fastening means specially adapted for diapers or the like open type diaper
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56Supporting or fastening means
    • A61F13/62Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
    • A61F13/622Fabric strip fastener elements, e.g. hook and loop

Abstract

The invention relates to a method for producing a multilayer material usable for refastenable fastening devices, characterized in that are been associated: a first layer (2) of non-woven fabric and/or fabric or similar materials; an intermediate layer (5) of material with elastic properties; a second layer (3) of non- woven fabric and/or fabric or similar material having one face provided with meshes or loops (4) placed externally and in that during the association the material forming said layers (2, 5, 3) is in its original conformation, i.e. not subjected to temporary or permanent mechanical deformation of its structure.

Description

TITLE; METHOD FOR PRODUCING A MULTILAYER MATERIAL. MULTILAYER MATERIAL AND ARTICLE PROVIDED WITH FASTENING

MEANS COMPRISING SAH) MATERIAL.

* * *

DESCRgTION

The present invention relates to a method for producing a multilayer material, a multilayer material and an article provided with fastening means having a multilayer structure.

In particular, the multilayer material is suitable for forming articles having resolvable coupling surfaces. A typical example of such surfaces is the so-called "Velcro", which comprises two surfaces, one of which is provided with a plurality of mesh or loops and the other is correspondingly provided with a series of hooks which can be reversibly coupled with those loops .

Such materials are used for the closures of diapers, incontinence pads, disposable bibs, etc.. For example, Figs. 1 and IA show two possible embodiments of a known baby diaper, shown, respectively, in a perspective view (Fig. 1) and in a plan view relating to a particular (Fig. IA).

With reference to the example of Figure 1, it is known that the diaper 10' is formed by a body of substantially absorbent material which defines an open pants, with two tabs 11, which can be reversibly coupled with a corresponding frontal tape 12 placed on the front face 13 of diaper 10'. In particular, each tab 11 has a surface 14 which in use is directed internally (i.e. intended to come into contact with the frontal tape 12) and is provided with hooks, which can be reversibly coupled with the loops of said band 12. In some known embodiment, the tab 11 comprises a portion 15 made of elastic material, so as to increase the wearability of the same diaper 10', for easily adapting to the value of waist circumference. In the particular shown in Fig. IA, the tab 11, which is provided with the surface 14 with hooks, is associated with a lug 16 of elastic material applied to the body of the diaper 10'. A drawback of the known articles provided with this type of closure is that the tabs are made of many materials which can be assembled together.

Another drawback is the presence of the frontal tape provided with loops; in fact, the presence of this band on the front of the diaper may increase production costs and may decrease its ease of use by increasing the rigidity of the same diaper, especially for the larger articles as, for example, the diapers for adults.

The document US-5647864 describes a multi-layer material provided with loops, which can be used to form a refastenable fastening device. The material described in US-5647864 is formed by an internal elastomeric adhesive film, which are associated with two layers of nonwoven fabric. In particular, the association between the nonwoven elastomeric layers and the adhesive material is performed when the latter is in a stretched condition. When the elastic material returns to its basic configuration (relaxed), the density of the loops on the non-woven material is greater than the non-woven fabric in its original configuration. As described in this document, it is necessary to use an elastomeric adhesive film which has higher production costs than a simple non-adhesive film. Moreover, the conformation of the nonwoven material is different from its basic shape and, therefore, the method described in the above document cannot be used when it is preferable to maintain the basic shape of the nonwoven material.

The aim of this invention is to provide a multilayer material, a method and an article provided with fastening portions with multilayer structure which can eliminate the drawbacks of the known solutions and which, at the same time, provide new producing methods that combine relatively low cost to a product provided with high comfort, with an effective fastening system, and with a simple construction.

This result was achieved in accordance with the invention by adopting the idea of a material, a method and an article having the characteristics described in the independent claims. Other features are described in the dependent claims.

Among the advantages of the present invention are the following:

- the multilayer material allows to provide fastening portions in which the optimal features relating the association to the hooks are joined to the elasticity of the same material providing a highly increased utility compared to the conventional solutions;

- the multi-layer material provides a surface provided with loops which has substantially the same characteristics of the basic layer provided with loops; in other words, the combination of the material provided with loops and the elastic layer does not determine a deformation of the same material provided with loops and the density of the loops in the multilayer material is substantially the same of the material used for the layer;

- the manufacturing process of the material is extremely simple and has relatively low costs; in addition the manufacturing process is relatively simple and, therefore, it can be implemented without requiring a highly skilled labor;

- the articles made according to the invention have the fastening portions made of a single material;

- the articles made in accordance with the present invention have a duration and an absorbing power which is comparable to conventional articles. Every technician who works in this field will better understand these advantages and features and further advantages and features of the present invention thanks to the enclosed drawings as a practical explanation of the present invention which should not be considered in a limitative sense, wherein:

- Fig.l is a schematic perspective view of a conventional disposable diaper 10', made according to known solution;

- Fig. IA is a schematic plan view of a detail of a conventional disposable diaper 10';

- Fig.2 shows schematically a possible embodiment of a method in accordance with the invention;

- Fig.3 is a schematic side view with parts not in scale of a multilayer material according to the invention;

- Fig.4 is a schematic perspective view of a possible embodiment of an article with fastening portions with multilayer structure according to the invention.

Referring to the attached drawings, a multilayer material made in accordance with the invention used for forming refastenable fastening devices comprises:

- a first layer 2 of non- woven fabric and/or fabric or similar materials;

- an intermediate layer 5 of material with elastic properties;

- a second layer 3 of non-woven fabric and/or fabric or similar materials having a side or face provided with meshes or loops 4 disposed externally.

For the production of a material according to the invention can be used a method which can be performed as shown in the example of Fig 2. In the scheme is shown a first tape 3 (which may consist, for example, of nonwoven fabric and/or tissue) which is unwound from a reel, disposed upstream and not represented. The tape 3 is provided on one side with meshes or loops 4 suitable for coupling with hooks (for example, type "Velcro"). The tape of the material 3 passes around a roll 51 and reaches a forming station where there are two rollers 52 and 54 which have their cylindrical surfaces in contact and which are driven for approaching each other in order to exert pressure on the materials in transit between themselves.

Like the first tape 3, the tape 2 of the second material passes around a roller 53 and reaches the forming station formed by the two rollers 52 and 54.

The layers 2 and 3 can be of non-woven fabric and/or fabric. For example, as non-woven fabric can be used polypropylene and/or polyethylene, while as fabric can be used polyamide and/or polyester.

In addition, the layer 3 (which has a face provided with loops 4) can be formed by a single layer provided with said loops or by two coupled layers, one of them it is provided with loops 4, also in this case outwardly disposed.

Upstream of the two rollers 52 and 54 is disposed an extrusion head 50, from which comes a material 5 suitable for having, in use, elastic properties. The material with elastic properties

5 may be, for example, elastic polyurethane or other similar material. Other possible examples of materials which can be used are: block copolymers with styrenic base (such as, for example, SIS, SBS, SEBS, SEPS) or TPOs, TPUs, TPES, OBCs.

Between the extruder 50 and said rolls 52 and 54, along the path followed by the material 5, are disposed and acting two pre-forming roller 57 and 58. The two rollers 57 and 58 are provided with cooling means, which reduce the temperature of the material 5 coming from the extruder 50 at relatively high temperature. The pre-treatment of the material 5 can prevent the excessive penetration of the same material 5 between the fiber of the layers 2 and 3.

The rollers 57 and 58 may be provided with surfaces having a low coefficient of adhesion to prevent or at least drastically reduce the adhesion of material 5 to the same rollers. Around the same rollers 57 and 58 can be pass an anti-adhesion films made, for example, of silicon

PET, silicon paper and similar products.

The distance between the two rollers 57 and 58, as the distance between the rollers 52 and

54, may be varied in order to determine a multilayer material having more or less elastic material in order to vary the elasticity of the same multilayer material 1.

Downstream of the two rollers 52 and 54 the finished multilayer material 1 can be wrapped to form a reel 55.

The association of the three materials 2, 3 and 5 can be obtained in various ways.

For example, can be obtained by gluing; for this aim along the path of the two materials 2 and 3 may be disposed dispensers 59 which distribute glue on the faces of said materials intended to come into contact with the material 5. In practice, the two layers 2 and 3, which have been previously invested by the glue in correspondence of the dispensers 59, are pressed on both sides of the material 5 by the action of the rollers 52 and 54.

Alternatively to the dispensers 59, or in addition to them, can be disposed the dispensers 59', which provide to distribute the glue on both sides of the tape of material 5.

Advantageously, the glue between the layers forming the multilayer material can be distributed in a non-continuous way. In practice, on both sides of the material 5, or on the layers 2 and 3, the glue can be distributed to allow some play between the elastic layer 5 and outer layers 2 and 3, to improve the tensioning features of the multilayer material. Furthermore, with a non-continuous glueing, also thanks to the presence of a minor amount of glue, the loops are not "drowned" by the glue and offer a better grip on the hooks in the reversible closure device.

For the glueing process can be used a dot-glueing or a discontinuous coating of glue.

According to another embodiment, the rollers 52 and 54 may be heated so as to associate together the three materials 2, 3 and 5 by thermal-bonding.

According to a further embodiment, the three layers can be associated by means of ultrasonic welding, using means not shown in the drawings, which can be disposed, for example, in correspondence of the rollers 52 and 54.

Using the three association method above mentioned (discontinuous glueing, thermal welding, ultrasonic welding) there is a savings in glue consumption compared to other methods of known type.

Moreover, during the association procedure performed to form a multilayer material, the material forming said layers 2, 5, 3 is in its original conformation, i.e. not subjected to temporary or permanent mechanical deformation of its structure. In other words, the material which forms the layers do not undergo any mechanical treatments as, for example, tension or compression during training, so allowing to obtain a final product which, for certain characteristics, is comparable to the base product. This is especially significant for the layer 3 provided with loops which offers the same loop-density either alone or forming the multilayer material.

In Figure 3 is represented in detail the material multilayer which, in accordance with this example, comprises a bottom layer 2 (which can be non-woven fabric and/or fabric), an elastic intermediate layer 5 (which can be elastic polyurethane, elastomeric gums, or other materials mentioned above) and an upper layer 3 (which can be non-woven fabric and/or fabric), provided with loops 4 on its outer surface.

According to an alternative embodiment, it is possible to use a material with elastic properties for one or both layers 2 and 3. In practice, can be used polyolefins with elastic characteristics, or block copolymers with styrenic base (such as, for example, SIS, SBS,

SEBS, SEPS) or TPOs, TPUs, TPES, OBCs.

Fig 4 shows a disposable baby diaper 10, made in accordance with the invention.

According to the present invention the tabs 11 used for closing the diaper are made of the multilayer material 1 and, therefore, are elastically yielding. In particular, the material 1 used for the tabs 11 is so arranged as to present its face provided with loops 4 inside, that is to come into contact with the front 13 of the diaper 10 in closed configuration. On the front 13 of the diaper 10 are placed one or more portions provided with hooks 6, to form a reversible closure device with the surfaces provided with loops 4 of the tabs.

The elasticity of the tabs 11 (indicated by the arrow F of Figure 4) together with the presence of the loops 4 on the same tabs, determine, inter alia, the following advantages: the diaper can be worn more easily and simply; there is a better wearing of the diaper when been worn; the taper provided with loops is eliminated from the front of the diaper; the tabs are made of a single multilayer material.

Similarly to the arguments relating to baby diapers, the material 1 of the present invention can be used for fastener devices of adult's diapers, disposable bibs, disposable aprons, etc.. In practice, the construction details may vary in any equivalent way as regards the shape, dimensions, disposition of elements, nature of the used material, without nevertheless departing from the scope of the adopted solution idea and thereby remaining within the limits of the protection granted to the present patent.

Claims

1. Method for producing a multilayer material usable for refastenable fastening devices, characterized in that are been associated: a first layer (2) of non-woven fabric and/or fabric or similar materials; an intermediate layer (5) of material with elastic properties; a second layer (3) of non- woven fabric and/or fabric or similar material having one face provided with meshes or loops (4) placed externally and in that during the association the material forming said layers (2, 5, 3) is in its original conformation, i.e. not subjected to temporary or permanent mechanical deformation of its structure.
2. Method according to claim 1, characterized in that the three layers (2, 3, 5) are associated with distribution of glue on said first and second layer (2, 3) and/or on said intermediate layer (5).
3. Method according to claim 1, characterized in that the three layers (2, 3, 5) are associated with discontinuous distribution of glue on said first and second layer (2, 3) and/or on said intermediate layer (5).
4. Method according to claim 1, characterized in that the three layers (2, 3, 5) are associated with thermal bonding.
5. Method according to claim 1, characterized in that the three layers (2, 3, 5) are associated with ultrasonic welding.
6. Method according to one of the previous claims, characterized in that said intermediate layer (5) is produced by an extrusion head (50) and that said layers (2, 3, 5) are associated by gluing.
7. Method according to claim 6, characterized in that the material (5) passes downstream of said extrusion head (50) through a pair of rolls (57, 58; 52, 54) whose distance is varied depending on the amount of elastic material (5) to be used in the multilayer material.
8. Method according to one of the previous claims, characterized in that the intermediate layer (5) comprises a material of the group of materials consisting of: elastic polyurethane, block copolymers with styrenic base, SIS, SBS, SEBS, SEPS, TPOs, TPUs, TPES, OBCs.
9. Method according to previous claims, characterized in that each of the layers (2, 3) of non-woven fabric and/or fabric comprises a material of the group consisting of: polypropylene, polyethylene, polyamide, polyester.
10. Method according to one of previous claims, characterized in that one or both layers (2, 3) of non- woven fabric and/or fabric have elastic properties.
11. Method according to one of the previous claims, characterized in that one or both layers (2, 3) of non- woven fabric and/or fabric have elastic characteristics and comprise a material of the group consisting of: elastic polyurethane, block copolymers with styrenic base, SIS, SBS, SEBS, SEPS, TPOs, TPUs, TPES, OBCs.
12. Multilayer materials material usable for refastenable fastening devices, characterized in that it comprises: a first layer (2) of non-woven fabric and/or fabric or similar material, an intermediate layer (5) material with elastic properties and a second layer (3) of non- woven fabric and/or fabric or similar material having one face provided with meshes or loops (4) placed externally, the material forming these layers (2, 5, 3) being in its original conformation, that is not having been subjected to temporary or permanent mechanical deformations of its structure during the formation of the multilayer material (1).
13. Material according to claim 12, characterized in that the three layers (2, 3, 5) are associated with distribution of glue on said first and second layer (2, 3) and/or on said intermediate layer (5).
14. Material according to claim 12, characterized in that the three layers (2, 3, 5) are associated with discontinuous distribution of glue on said first and second layer (2, 3) and/or on said intermediate layer (5).
15. Material according to claim 12, characterized in that the three layers (2, 3, 5) are associated with thermal bonding.
16. Material according to claim 12, characterized in that the three layers (2, 3, 5) are associated with ultrasonic welding.
17. Material according to one of claims 12 to 16, characterized in that the intermediate layer (5) comprises a material of the group of materials consisting of: elastic polyurethane, block copolymers with styrenic base, SIS, SBS, SEBS, SEPS, TPOs, TPUs, TPES, OBCs.
18. Material according to one of claims 12 to 16, characterized in that each of the layers (2, 3) of non-woven fabric and/or fabric comprises a material of the group consisting of: polypropylene, polyethylene, polyamide, polyester.
19. Material according to one of claims 12 to 16, characterized in that one or both layers (2, 3) of non- woven fabric and/or fabric have elastic properties.
20. Material according to one of claims 12 to 16, characterized in that one or both layers (2, 3) of non- woven fabric and/or fabric have elastic properties, comprising a material of the group of materials consisting of: elastic polyurethane, block copolymers with styrenic base, SIS, SBS, SEBS, SEPS, TPOs, TPUs, TPES, OBCs.
21. Material according to one of claims 12 to 16, characterized in that the said second layer (3) is composed of a single layer provided with loops (4).
22. Material according to one of claims 12 to 16, characterized in that the said second layer (3) is composed of two layers, one of them being provided with loops (4).
23. Article provided with at least a fastening portion having a multi-layer structure characterized in that said fastening portion (11) is made of a multilayer material according to one of the previous claims.
PCT/IT2010/000356 2009-08-06 2010-08-04 Method for producing a multilayer material. multilayer material and article provided with fastening means comprising said material WO2011016077A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IT1395029B1 IT1395029B1 (en) 2009-08-06 2009-08-06 The multilayer material, process for the production of such material and article provided with the hooking portions multilayer structure.
ITBO2009A000532 2009-08-06

Publications (1)

Publication Number Publication Date
WO2011016077A1 true true WO2011016077A1 (en) 2011-02-10

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647864A (en) 1994-06-06 1997-07-15 The Procter & Gamble Company Nonwoven female component for refastenable fastening device and method of making the same
US20030125704A1 (en) * 2001-12-31 2003-07-03 Kimberly-Clark Worldwide, Inc. Mechanical fastening system for an absorbent article

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10358409B4 (en) * 2003-12-13 2006-07-13 Nordenia Deutschland Gronau Gmbh Composite for an elastic diaper closure and method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647864A (en) 1994-06-06 1997-07-15 The Procter & Gamble Company Nonwoven female component for refastenable fastening device and method of making the same
US20030125704A1 (en) * 2001-12-31 2003-07-03 Kimberly-Clark Worldwide, Inc. Mechanical fastening system for an absorbent article

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