Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1983-11-01
1986-06-17
Kimlin, Edward
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156164, 156256, 156301, 156324, 156525, 156554, 156559, B32B 3108, B65C 925
Patent
active
045954410
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is a continuous fabrication method for a disposable article to absorb liquids, using a machine comprising a device for paper-pulp grinding, a section shaping a continuous strip of ground pulp, a device for cutting said strip into a series of absorbing materials.
The present invention also relates to disposable articles to absorb liquids, in particular body liquids such as blood or urine.
These articles can be dressings, menstrual napkins, diapers, or complete changes for babies or incontinent adults.
In general such articles are stratified and consist of a pad of cellulose fibers making it possible to absorb and retain liquids, and placed between a liquid-permeable foil and a plastic foil acting as a barrier against said liquids.
Most often the permeable foil is a non-woven material consisting of artificial and/or synthetic fibers. Reserach in recent years has been widely applied to the structure of these non-woven materials; depending on the fabrication procedure and the kind of fibers used, non-woven materials rapidy transmitting a liquid but retaining little humidity after the ligquid has been absorbed by a pad of cellulose fibers can be made.
Accordingly, the surface of the absorbing articles in contact with the user's skin stays slightly moist; comfort is increased and the danger of irritation is substantially decreased.
The plastic foil blocking the liquids as a rule is an embossed polyethylene foil bonded to the non-woven material along the article's longitudinal edge; it protects clothes and underwear.
In some cases, as for complete changes, the polyethylene foil is folded back along the periphery of the article to form a narrow hydrophobic and impermeable strip on the side of the non-woven material; therefore, when the article is well applied on the user, the liquids to be absorbed remain within the zone defined by the polyethylene strip. Danger of leakage is reduced, but the major drawback is that the user's skin is humid over the entire surface of the article.
Other articles such as menstrual napkins are totally enveloped by a non-woven material and are provided between this non-woven material and the absorbing pad with a U-shaped plastic foil protecting both the inside of the articles and its sides. Recently, menstrual napkins have become commercially available which comprise a plastic foil of which the legs of the U are folded back along the longitudinal edges so as to form a kind of gutter; thereby the lateral leaks are practically eliminated, but on the other hand the article ends comprise no barrier at all against the liquids.
To palliate the drawbacks of the present articles, the present invention proposes a new structure whereby an impermeable foil provided with a liquid-permeable zone is placed between the non-woven material making contact with the user's skin and the absorbing material, said zone being located centrally with respect to the upper side of the absorbing material.
In the invention, the fabrication method is characterized in that: two continuous strips passes into a device cutting it in its median zone along a lay-out consisting of a series of straight-line sections parallel to the longitudinal axis of the foil, said straight-line sections being: consecutive sections located on the same side of the foil axis exceeding the length of the sections, at their center, the distance between the sections located on either side of the foil axis, length of the first by the repeat of the cut-out, manner that the open zones bounded by said strips are located in the central region of the absorbing material,
In a variation of the invention the two strips are heat-sealed or bonded along the article's longitudinal edges to a continuous impermeable foil which provides the inside.
In a variation of the invention, the impermeable foil is micro-punctured before being cut, for instance using a needle-studded roller with a foam-support roller on the other side, both rollers being the same width as the foil. This embodiment retains liquids especially satisfactori
REFERENCES:
patent: 3758363 (1973-09-01), Frick
Holvoet Marcel
Mitrani Sem
Pigneul Raymond
Beghin-Say S.A.
Breiner A. W.
Cashion Jr. Merrell C.
Kimlin Edward
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