Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1987-12-29
1990-01-09
Hindenburg, Max
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
604378, A61F 1316
Patent
active
048925322
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a disposable liquid-absorbing article such as a diaper, a sanitary napkin or the like comprising an absorption body surrounded by a casing which is liquid permeable at least in its portion facing the user of the article.
BACKGROUND OF THE INVENTION
Disposable articles in the form of diapers, sanitary napkins and the like must meet very high demands with regard to the portion of the casing adapted for contact with the wearer's body during use of the article. On the one hand, this body-contacting portion must give a soft and pleasant feel to the skin for the wearer's comfort; that is the surface friction of the casing material should be low in order to avoid skin irritation caused by mechanical rubbing, and on the other hand the casing material in contact with the wearer's skin during use should be capable of remaining dry. Moreover, the portion in question should have an extremely high wear-resisting capacity to withstand wear from its contact with the wearer's skin. In addition, the surface layer must be capable of creating a certain distance between the skin and the absorption body in order to prevent rewetting the wearer's skin with fluid from the absorption body.
THE PRIOR ART
So far, there has been found no satisfactory method of fulfilling the requirements set forth above
In general, the liquid-absorbing disposable articles of today have a hydrophobic fibrous layer placed in direct contact with the wearer's skin. Although this layer does in fact exhibit a certain protective effect against rewetting, it still lacks the capacity of presenting a well-functioning combination of surface softness and wear strength. To obtain a sufficient degree of wear strength in chemically bonded fiber fabrics, such large amounts of binding agent have had to be intermixed that the fibrous layer has become rough and given rise to an unpleasant feel when in touch with the skin.
It is also previously known to use melt-bonded types of fiber fabric consisting of thermoplastic fibers bonded to a surface pattern by means of melt bonding. As is the case with chemically bonded fiber fabrics, however, these latter layers as well become much too harsh with a high-density bonding pattern, whereas their wear strength will be insufficient when bonded too loosely.
Even the problem of creating the necessary spacing to the absorption body has remained unsolved with the types of prior art surface layers described in the foregoing.
In conventional articles there is frequently used a layer of cellulose wadding placed inside the hydrophobic surface layer, which per se provides a certain distance between surface layer and absorbent body, the cellulose wadding simultaneously serving to somewhat stabilize the absorption body which is generally composed of pulp fibers. There is however the drawback associated with cellulose wadding that it has a both liquid absorbing and liquid distributing effect, permitting in this manner liquid to spread and remain collected immediately underneath the surface layer of these known articles. Therefore, such a solution is far from satisfactory with regard to rewetting.
Previous attempts have also been made in an effort to overcome the problem of rewetting by placing an insulation layer of airlaid hydrophobic fibers between the outer casing and the absorption body. This has indeed considerably eliminated rewetting while having instead created other significant drawbacks since it is hardly useful from a manufacturing viewpoint because of the difficulties associated with the application of such layers at high manufacturing speeds while simultaneously maintaining a highquality performance.
A most vital aspect, which has so far been neglected by manufacturers of diapers and sanitary napkins in the production of suitable casing portions intended for direct contact with the wearer's body, is the instantaneous absorption. If a casing layer is produced which is thick enough to prevent rewetting, the instantaneous absorption will be too low due to the tendency
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Hindenburg Max
Molnlycke AB
Reichle K. M.
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