Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1987-01-16
1988-08-09
Yasko, John D.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
604370, A61F 1316
Patent
active
047625201
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an absorbent article such as a sanitary napkin or a diaper, comprising an absorption body accomodated in a casing.
For the absorption of human body fluids by means of disposable absorbent articles, it is extremely important that the construction of the product in question allows for the body-contacting layer to remain dry, i.e. so as to prevent rewetting of the user's skin. For this purpose it is common practice in today's manufacture of absorbent articles to have the casing made of hydrophobic material. A casing of this type normally consists of fiber fabric which for practical reasons, e.g. for providing a sufficient degree of wear resistance, is firmly and tightly bonded. As a result, however, the fiber fabric will be comparatively thin and incapable of preventing in a satisfactory manner rewetting with fluid from the absorption body. No insulating effect is thus obtained with this thin fiber layer since fluid from the absorption body will easily penetrate it thereby making a product provided with this type of casing unpleasant to wear.
Previous attempts have been made to overcome this problem by applying specific insulating layers between the surface layer and the absorption core. For this purpose an airlaid layer of hydrophobic fibers, or fibers coated with a hydrophobic agent, has shown to function well as an insulating layer, but has also proved inappropriate with regard to manufacture because of the difficulties associated with the application of such layers at a high manufacturing speed while simultaneously fulfilling the demands on quality. Insulating layers in web shape have also been utilized. In this context there is however the problem that such factors as strength and insulating capacity are difficult to combine in the web material. If a voluminous insulating layer is desired, the resistance to tensile stress arising in the web material during manufacture will necessarily be poor.
The present invention has for its object to accomplish an improved casing for absorbent articles with a well-functioning insulating layer by means of which the problems touched upon above would be totally eliminated. For this purpose, an absorbent article made in accordance with the invention and being of the type set forth in the introduction is primarily distinguished by the casing consisting of a carded fiber fabric made in one piece and containing at least 5% of melt fibers, preferably of polypropylene, said casing being sub-divided into parallel streaks having different melt-bonded patterns, producing in this manner varying structures in the streaks adapted to their individual positioning in relation to the absorption body.
In a suitable embodiment of the article in question, the casing seals around the absorption body with at least two layers on the side of the absorption body facing the user.
To advantage, the outermost of these layers has a substantially tighter bonding pattern than the loosely bonded and voluminous interior layer(s).
As a consequence of the casing for the inventive absorbent article being composed of a plurality of coherent parallel streaks, one ore more streaks serving as insulating layers can be given a highly voluminous shape, since the tensile stress in the longitudinal direction of the manufacturing web could be taken up by the other streaks included in the casing material.
The invention will be more closely described in the following with reference to the accompanying drawing, of which
FIG. 1 is a plan view of a first exemplary embodiment of a casing for an absorbent article made according to the invention;
FIG. 2 shows a cross section through the casing of FIG. 1;
FIG. 3 shows a cross section through an absorbent article provided with a casing according to FIGS. 1 and 2;
FIG. 4 shows to a larger scale a cross section through a streak in a casing according to a second exemplary embodiment;
FIG. 5 shows a similarly enlarged cross section through a liquid insulating layer built up of streaks of the type shown in FIG, 4; whereas finally
FIG. 6 shows an a
REFERENCES:
patent: 3056406 (1962-10-01), Ness
Molnlycke AB
Yasko John D.
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