Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Nonwoven fabric – Including strand or fiber material which is a monofilament...
Patent
1996-01-18
1997-09-23
Cannon, James C.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Nonwoven fabric
Including strand or fiber material which is a monofilament...
156291, 1563082, 442364, 442389, 442393, 442411, 428340, 604366, 604384, 6043851, A61F 1354, B32B 508, B32B 710, B32B 712, B32B 3120
Patent
active
056697988
DESCRIPTION:
BRIEF SUMMARY
The invention relates generally to a new nonwoven material which, when employed as surface voile or sheet or as a supplement to the surface sheet as strip in the crotch region in an absorbent article of hygiene such as a diaper or dressing for the incontinent, allows better isolation of the user's skin from the absorbent part of the article of hygiene. In particular, this new material is favorable to the time taken by the body fluids to pass through and to resistance to rewetting, and does not become fluffy.
In general, absorbent articles of hygiene such as diapers and dressings for the incontinent, comprise an outer layer of liquid-impervious material, a pad made of absorbent material and a surface of voile or sheet which is permeable to body fluids such as urine, of size and shape which are similar to those of the impervious outer layer of the article. The purpose of this surface voile which is permeable to body fluids is to isolate the skin from the moist and absorbent pad. Consequently, the surface sheet must have an appropriate degree of softness and provide the required isolation between the skin and the absorbent pad. The purpose of the absorbent pad is to absorb the fluids and consequently it must have a high rate of absorption and a high absorbency. A particularly effective absorbent pad is described in document EP-A-0,232,729. This absorbent pad or mat is made up of a sheet of long absorbent fibers, the faces of said sheet being lined with a layer of cellulose wadding. The sheet lined with the layers of wadding is needled from both sides.
In the absorbent articles of hygiene such absorbent mats or pads are covered by a surface sheet or by a strip in the crotch region, generally made of an unwoven material, the purpose of which is to isolate the skin from the absorbent pad and which must provide a pleasant contact with the skin and the required isolation from the absorbent pad. These surface voiles or sheets and strips in the crotch region must exhibit, as essential properties, a pleasant contact with the skin, a high rate of permeation by the body fluids, a good resistance to rewetting and must not become fluffy.
Document FR-A-2,588,285 describes a multilayer nonwoven textile which has at least two layers of nonwoven voile, one of the layers being made of fibers of bilobar cross-section and the other layer being made of fibers of trilobar cross-section. Each voile layer is preferably obtained by the technique of bonding when spinning (spun-bonded) and the two voile layers are joined together to form the multilayer nonwoven by heat-bonding in the compacted and noncontinuous regions.
Document WO 87/07117 describes an absorbent article of hygiene comprising an absorbent body surrounded by a cover. This surface cover or voile consists of two layers of nonwoven material. The first layer of nonwoven material, in contact with the user's skin, consists of a thin layer of spun-bonded fibrous fabric made of a hydrophobic material, and the second layer in contact with the absorbent body is a hydrophobic fibrous layer of melt-bonded fibre fabric, similar in construction to the first layer. These two surface voile layers are not bonded together in the region intended to come into contact with the user's body.
Document WO 88/05269 relates to a surface voile for a disposable absorbent article consisting of at least two layers of nonwoven material which may be identical or different and which are joined together by lines of adhesive forming an open pattern.
A new composite nonwoven material has also recently been developed, comprising at least one first layer consisting of a nonwoven (preferably spun-bonded) and, on this first layer, a sheet of fibers of carded type, the sheet of fibers of carded type being bonded to the base layer by needling.
Another recently developed composite nonwoven material comprises a first layer made of a nonwoven (preferably spun-bonded), a sheet of fibers of carded type and a second layer made of a nonwoven (preferably spun-bonded) of smaller weight per unit area than the first layer
REFERENCES:
patent: 4826498 (1989-05-01), Koczab
patent: 5143779 (1992-09-01), Newkirk et al.
Cannon James C.
Peaudouce
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