Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1995-05-16
1998-03-17
Clarke, Robert A.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
162289, 162290, 442409, 442413, 442417, 604384, 604380, A61F 1315, D21F 500, D04H 158
Patent
active
057280851
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
1. Field of the Invention
The present invention relates to a method for manufacturing of an absorbent structure in an absorbent article, such as a sanitary napkin, a tampon, a panty protector, an incontinence guard, a diaper, a wound or sore dressing, a saliva absorbent and like articles. The invention also relates to an article manufactured according to the method.
2. Discussion of Related Art
Many different types of absorbent articles are known to the art. The absorbent bodies of such articles are typically produced by dry-defibering and fluffing cellulose pulp in roll, bale or sheet form for instance, to form a pulp mat, sometimes admixed with so-called superabsorbent material in the pulp mat, these absorbents being polymers which are capable of absorbing many times their own weight of water or body fluid.
The pulp body is often compressed so as to enhance its fluid-wicking ability and also in order to reduce pulp body bulk and therewith obtain an article which is as compact as possible.
The absorbent body may also include other constituents, for instance constituents which will improve its fluid-aquisition properties or its fluid-wicking properties, or which will increase its coherent strength, i.e. its coherency, and its ability to withstand deformation in use.
One serious drawback with products of this nature is found in the total absorption capacity of the articles and also in the fact that the articles will often leak long before their total absorption capacity has been fully utilized. Among other things, this is because the body fluid discharged by the wearer is unable to penetrate into the absorption material and to spread to hitherto unused areas of the article quickly enough, but instead leaks from the sides of the sanitary napkin, the diaper or the incontinence guard. The ability of the materials used in the article to disperse the absorbed fluid throughout the entire absorbent body is thus highly important.
Another problem resides in so-called rewetting, i.e. the transference of body fluid that has already been absorbed back into contact with the wearer's skin as a result of external forces, for instance when the wearer sits down. It is generally desired that the surface of the article that lies proximal to the wearer in use will remain as dry as possible.
Another desideratum with regard to the majority of hygiene products is that the article shall be thin, so that it can be worn as discretely as possible.
A very large part of the production plants used in the manufacture of the aforesaid hygiene articles is comprised of defibrating equipment, pneumatic conveying systems and mat-forming equipment. This equipment is also the source of serious faults in the production plants. Equipment for compressing the finished pulp mat or the finished hygiene product is furthermore often included downstream of the production plants.
A separate problem is related to the use of superabsorbent material in absorbent articles. The superabsorbent material is normally available in the form of granules, which are difficult to bind to the absorbent structure.
It is known from International Patent Application WO 90/05808 to produce a pulp web by dry-forming, which is later defibered, so-called dry-formed roll or reel pulp, Flash-dried paper-pulp fibres, which may consist of thermomechanical pulp, chemi-thermomechanical pulp, CTMP, or chemical paper pulp, sulphite or sulphate pulp with a dry solids content of about 80% is delivered by means of an air stream in a controlled flow to a forming head arranged above a forming wire and there formed into a web that has a surface weight of 300-1500 g/m2 and a density of 550-1000 kg/m3. Air is sucked away through a suction box placed beneath the wire. The moisture content in the process shall be 5-30%.
The web is pre-pressed to a density of 550-1000 kg/m3 in order to slightly reduce the bulk of the web prior to the final pressing stage. The pressed web has a mechanical strength which enables the web to be rolled-up or handled in sheet form for storage and transporta
REFERENCES:
patent: 4507122 (1985-03-01), Levesque
patent: 4610678 (1986-09-01), Wiesman et al.
patent: 5134007 (1992-07-01), Reising et al.
patent: 5324575 (1994-06-01), Sultze et al.
Hansson Roy
Kolar Milan
Osterdahl Eje
Widlund Urban
Clarke Robert A.
Molnlycke AB
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