Absorbent body in an absorbent article, such as a sanitary napki

Details Absorbent body in an absorbent article, such as a sanitary napki Absorbent body in an absorbent article, such as a sanitary napki

1994-10-18

1997-08-05

Milano, Michael J.

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

604378, A61F 1315

Patent

active

056537026

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an absorbent body in an absorbent article, such as a sanitary napkin, panty protector, incontinence guard, diaper and like articles.


BACKGROUND ART

Many different designs of absorbent articles of this kind are known to the art. The absorbent body of products of this nature are normally comprised of one or more layers of cellulose fluff pulp, which is sometimes intermixed with so-called superabsorbents, which are polymers that are capable of absorbing water or body liquid in quantities equal to several times their own weight. The absorbent body may also include other constituents, for instance constituents which improve the liquid-dispersing properties or the ability of the body to remain intact and also its ability to resist deformation in use.
SE-B-465 806 describes an absorbent body for use in absorbent articles of this kind, said absorbent body including a first layer which is intended to lie proximal to the wearer in use and which includes a first mixture of fibres, and a second layer which includes a second mixture including absorbent fibres.
One serious problem with articles of this kind is that they often begin to leak long before their total absorption capacity has been fully utilized. This is due, among other things, because the body liquid discharged by the wearer is unable to penetrate into the absorbent material quickly enough and, instead, leaks from the sides of the sanitary napkin or incontinence guard.
Another problem relates to so-called rewetting, which means that absorbed body liquid is pressed back into contact with the wearer's skin by external forces, for instance when the wearer sits down.
It is desirable for the surface of the article which faces towards the wearer in use, i.e. the proximal surface, remains as dry as possible. This is difficult to achieve, particularly with sanitary napkins, since the menstruation liquid has a high viscosity and therefore tends to fasten to the surface material of the napkin.
A thin article is also desired, so that the article can be worn as discretely as possible.


OBJECTS AND SUMMARY

An object of the present invention is to provide an absorbent article of the kind defined in the introduction which can be made very thin while still being essentially proof against leakage. The article shall also exhibit high surface dryness and low rewetting tendencies. Another object is to provide an article in which the absorbent material has a high tensile strength which corresponds at least 2N/50 mm in a dry state, so that said material can be handled in the form of rolls.
These objects are achieved in accordance with the present invention by providing the absorbent article with an absorbent body which includes a first layer which is intended to lie proximal to the wearer in use and which includes a first mixture fibres, and a second layer which includes a second mixture including absorbent fibres, said absorbent body being characterized in that said first mixture is 80-95 percent by weight resilient fibres and 5-20 percent by weight heat-actuable binding fibres, said heat-actuable fibres being actuable at temperatures at which the resilient fibres are not heat-actuable; said second mixture is 45-90 percent by weight absorbent fibres and 5-15 percent by weight, preferably 8-10 percent by weight heat-actuable binding fibres; and in that the binding fibres have been bonded together by heat treatment and function to hold the fibre structures together in said layers such that said layers form a laminate having a tensile strength of at least 2N/50 mm in a dry state.
The second layer may also include superabsorbent material, which is either admixed with the fibres or is applied in the form of one or more layers between the fibre layers. Alternatively, superabsorbent material can be applied in the form of a laminate between tissue layers.
The combination of two absorbent layers in the aforesaid manner provides the advantage of having a first admission layer which is able to quickly take-up a given quantity of liquid and allow the l

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