Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1996-06-18
1998-08-25
Clarke, Robert A.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
156 731, 156 732, 156164, 428326, 604373, A61F 1315
Patent
active
057978956
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 application of PCT/SE 94/01236, filed Dec. 21, 1994.
BACKGROUND OF THE INVENTION
The present invention relates to a method of bonding an elastic material comprising at least one elastic component and at least one thermoplastic component, to a substrate. The present invention also relates to an article comprising an elastic material and a substrate bonded therewith.
It is well known in the field to apply elastic elements to absorbent disposable products such as diapers, incontinence protectors, pant diapers and sanitary napkins to create better comformity to the user's anatomy as he or she moves. The elastic elements are usually applied along the edge portions (the leg and/or waist edge portions) in order to achieve a good seal there to prevent leakage of fluid and/or excrement from the article.. Elastic cover material for absorbent disposable articles is also known, i.e. not only separate elastic elements along the edge portion. Rather, the cover layers (the fluid receiving surface layer and/or the fluid blocking outer layer) can be completely elastic. When separate elastic elements have been applied, it is usual that they are applied between the cover layers of the article, i.e. the fluid receiving surface layer and the fluid blocking outer layer. Usually the elastic elements consist of elastic rubber threads which are anchored in place by means of adhesive, at least at their end portions.
In contrast to the traditional sandwich lamination of the elastic element between two layers, it is also known to apply, in various applications, an elastic element or, alternatively, an elastic material layer, against one side of a single layer or substrate, by gluing, for example SE 450 454 describes, for example, that a net work consisting of unspecified elastic and inelastic strands can be fixed in an unspecified manner to an additional material layer of the article. (See especially page 13, lines 19-28).
EP-A 60 405 describes an elastic tape comprising elastic threads of rubber or synthetic rubber, some of which are entwined in relatively inelastic threads of natural or artificial textile fibres. Fixing elastic tapes to substrates is not discussed at all in EP-A 60 405.
FR-A 2 452 537 describes an elastic material comprising a relatively inelastic thread, of cotton, for example, surrounded by a knitted elastic thread of rubber or Lycra.RTM., for example. When the elastic material contracts from its extended state, loops are formed of the relatively inelastic thread between two subsequent knots or stitches on the inelastic thread. (See especially FIGS. 2 and 3). There is no indication in this specification as to how such an elastic material could be anchored to a substrate.
FR-A 2 643 925 describes an elastic material which is achieved by braiding together elastic warp threads, generally of artificial or natural rubber, and relatively inelastic weft threads. This specification does not give any indication either as to how an elastic material could be anchored to a substrate.
SUMMARY OF THE INVENTION
A primary purpose of the present invention is to be able to anchor elastic elements without using adhesive, i.e. glue.
Another purpose is to permit anchoring of elastic elements to one side of a substrate, i.e. without the necessity of applying it between two layers.
A further purpose of the present invention is to make possible bonding by welding of elastic materials which are not naturally heat-bondable or weldable to a substrate.
An additional purpose is to achieve an article of disposable character, where the materials are bonded in such a manner.
These purposes are achieved by a method of the type described by way of introduction, which is characterized in that the thermoplastic component or the thermoplastic components of the elastic material are bonded to the substrate and by an article of the type described by way of introduction which is characterized in that the elastic material comprises at least one elastic component and at least one thermoplastic component welded or thermally
REFERENCES:
patent: 4781966 (1988-11-01), Taylor
patent: 5542941 (1996-08-01), Morita
Kling Robert
Widlund Urban
Clarke Robert A.
Molnlycke AB
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