Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1995-06-02
1998-03-17
Weiss, John G.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
604379, 604370, 604368, 604372, A61F 1317, A61F 1320
Patent
active
057280843
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
The present invention relates to a sanitary towel generally consisting of an upper layer which is permeable to liquids, a lower layer which is impermeable to liquids and an absorbent element disposed between them.
More particularly, the invention relates to a sanitary towel the structure of which comprises one or more layers intended to control the distribution of the liquid which is deposited on the surface of the upper layer facing the user's body.
Preferred arrangements of the invention comprise an absorbent element which contains hydrogelling absorbent material as a component, and preferably as the principal component.
Sanitary towels having an upper layer which is permeable to liquids, an impermeable lower layer and an absorbent element which is disposed between them and contains hydrogelling absorbent material are known in the prior art.
The patent U.S. Pat. No. 5,009,653 describes a sanitary towel comprising an upper layer which is permeable to liquids, a lower layer which is impermeable to liquids and an absorbent element disposed between them, the absorbent element consisting of a layered structure consisting of two dry-formed external tissue layers and of a central layer of hydrogelling absorbent material.
A layer for collecting the liquid, consisting of a non-woven fabric, 70% of which is composed of rayon and 30% of which is composed of polyester fibres, is disposed between the upper layer and the absorbent element and is intended to improve the sideways distribution of the liquid passing through the upper layer. The sideways distribution of the liquid in the collecting layer increases the surface area of the absorbent element to which the released liquid can have access, but, on the other hand, it is possible for the liquid to migrate to the edges of the sanitary towel such that it can spot and stain the user's underclothes in certain conditions of use.
The patent EP-A-257280 describes a composite covering layer for an absorbent article, such as a sanitary towel, in which a substantially hydrophobic perforated polymer film which is less than 0.762 mm thick and has a total open area of at least 35% is disposed on a layer of non-woven fabric secured thereto, the openings in the first layer having dimensions which are insufficient to allow the passage of a 1% saline solution under the effect of gravity alone, whilst the second layer has a capillary structure such that it allows a rise of less than 12.7 mm of 1% saline solution after 15 minutes.
The absorbent article comprises an absorbent element having a two-layered composite structure, in particular a low-density upper layer formed of cellulosic fibres and a lower layer consisting of a high-density mixture of cellulose fibres and superabsorbent material.
The lower side of the absorbent element is secured to a polyethylene sheet which extends to the side edges of the absorbent element to prevent the fluid being able to pass from the base and side edges of the absorbent element to the user's underclothes.
It should be noted that the composite covering layer enables the liquid to flow in a single direction to ensure improved properties with respect to the backflow of liquid, and it is further noted that the said layer displays very poor diffusion properties, or a low ability for transmitting the liquid in a sideways direction.
The present invention seeks to avoid the disadvantages of an intermediate layer which is completely permeable to liquids, at the same time retaining the ability to distribute the liquid received to zones of the absorbent element remote from the area where it is collected.
OBJECT OF INVENTION
It is therefore an object of the invention to produce a sanitary towel having a layered structure which enables the liquid released over the surface of the said sanitary towel facing the users body to be controlled.
It is also an object of the invention to produce a sanitary towel having an absorbent element disposed between a lower layer which is impermeable to liquids and an upper layer which is permeable to
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Carlucci Giovanni
Di Girolamo Remo
Divo Michael
Marinelli Luigi
Palumbo Gianfranco
Bamber Jeffrey V.
Milbrada Edward J.
Miller Steven W.
The Proctor & Gamble Company
Weiss John G.
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