Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1983-09-28
1985-10-08
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428182, 428183, 428219, 428339, 428340, 604384, 604385R, A61F 1300, A61F 1501, D04H 506, D04H 508
Patent
active
045460272
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a non-woven material whose curly or wavy structure enables it to be used in particular as a medical or surgical compress.
At present, medical compresses are obtained from a light fabric--called dressing gauze--(weight between 25 and 28 g/m.sup.2) whose manufacture requires the utilization of a costly and inefficient material. This fabric is then folded and cut into several sizes; each compress is then in general wrapped individually and sterilized.
Compresses made of conventional gauze are very flat products, adhering to wounds and having quite a low fluid absorption coefficient. In addition, their elasticity and resilience characteristics are very clearly insufficient.
The aim of much research work has been to replace the gauze by non-woven materials obtained by a dry process, wet process or so-called "spun-bonded" method and compounds of mixtures of synthetic and/or natural fibers. Although the properties of non-woven compresses are appreciably superior to those made from gauze, particularly as regards non-adhesion to wounds, they nevertheless are still far from meeting requirements as regards absorption.
The present invention relates to a non-woven material mitigating the disadvantages of non-woven materials and conventional gauze. Its particular structure enables properties such as high absorption capacity, non-adherence to wounds, elasticity, and resilience to be combined.
In general, this non-woven material has a succession of uniformly distributed waves whose anti-nodes are alternatively located above and below the medium plane of the non-woven material.
In particular, the continuous anti-nodes of two adjacent waves, located on the same side of the medium plane of the non-woven material, consist of small adjacent pads.
According to one embodiment of the invention, the non-woven material is a composite consisting of synthetic netting on which a web of cellulose fibers is fixed, in particular by thermo-bonding.
The invention will be better understood with the aid of the drawings, which represent non-limitative examples of the design of the non-woven material:
FIG. 1 is a view of the non-woven material from below;
FIG. 2 is a sectional view of FIG. 1 in a plane parallel to the machining direction of the non-woven material;
FIG. 3 is a sectional view of FIG. 1 in a plane perpendicular to the machining direction of the non-woven material;
FIG. 4 is a perspective view of a non-woven material of a synthetic netting and a cellulose fiber web.
FIG. 1 is a view from below the non-woven material (1) which has a machining direction (2), corresponding to the longitudinal direction of the manufacture of said non-woven material, and a crosswise direction (3) perpendicular to the machining direction (2). This non-woven material (1) comprises evenly spaced waves or curls positioned along the lines (5) parallel to the machining direction (2).
FIG. 2, which is a sectional view of FIG. 1 along 2--2, in a plane parallel to the machining direction (2) shows that the non-woven material has waves (4) whose anti-nodes (6,7) are alternatively above and below the median plane (8).
FIG. 3 which is a sectional view of FIG. 1 along 3--3, in a plane perpendicular to the machining direction (2) shows that the contiguous anti-nodes (9,10) of adjacent waves consist of small adjacent pads (11,12) located on the same side of the median plane (8) of the non-woven material. Beyond the sectional plane is seen an outline of the pads located below the median plane (8). The height and width of these pads are between 0.1 and 3 mm.
FIG. 4 shows a preferred embodiment of the invention; the non-woven material consists of a synthetic netting (13) consisting of filaments (15) of a first polymer inside a sheath of a second polymer and connected by fine lamellas (16) of a second polymer, forming a netting on the surface of which is deposited a cellulose fiber web (14).
The web (14) is thermo-bonded to the netting (13); the non-woven material, therefore, does not include any chemical binder and can, therefore, be use
REFERENCES:
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patent: 3130412 (1964-04-01), Fox et al.
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patent: 4001472 (1977-01-01), Thomas et al.
patent: 4211807 (1980-07-01), Yazawa et al.
patent: 4333979 (1982-06-01), Sciaraffa et al.
Holvoet Marcel
Picard Bernard
Beghin-Say S.A.
Breiner A. W.
Cannon James C.
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