Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-08-11
1990-03-06
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
162143, 162146, 1621576, 428290, 428296, 428297, 428393, D04H 104, D21H 512
Patent
active
049065211
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a non-woven fibre product which is totally or partially composed of fibres having bonding properties.
Non-woven fibre products are often porous materials resembling textiles, usually in web or sheet form, and manufactured by a procedure other than the spinning, weaving, knitting and braiding methods commonly employed. The fibres used in producing non-woven fibre products may be natural fibres or synthetic fibres, or mixtures of these. Holding together of the fibre webs may be based on inter-fibre bonding properties, or coherence may be achieved with various bonding agents, and in addition many other bonding methods may be applied in manufacturing said products, e.g. bonding the fibres with the aid of heat or by fusing.
The present invention concerns non-woven fibre webs in which bonding is accomplished by using fibres which possess special bonding properties, these fibres being admixed to the fibre web that has to be bonded, or these fibres constituting the fibre raw material of the fibre product. Usually, bonding fibres used towards such a purpose have been fibres of synthetic origin, for instance polymer fibres, which have been softened, or partly fused, with the aid of chemical or heat treatment in order to achieve bonding properties.
The usability of fibres processing bonding agent properties depends on the fibres to be bonded in general, on the intended use of the product, and on the mechanical strength properties of the product achieved with the bonding agent fibres. Fibres of cellulosic origin possessing bonding properties are, for instance: ground cellulose fibres, cellulose derivative fibres such as carboxymethyl and carboxyethyl cellulose fibres, and viscose fibres prepared by special procedures. Most of the bonding agent fibres have a nature such that they detract from the textile-resembling characteristics of the product. Therefore a considerable need exists in the market of fibres with the aid of which fibre webs made of natural or artificial fibres could be bonded without incurring impaired textile characteristics of the products.
Viscose fibres have long been an important cellulose-based fibre which has been extensively used as fibre raw material for textile-type products. Among the drawbacks of viscose fibres may be noted inadequate wet and dry strengths of the fibre webs made of them if no separate bonding agents or bonding agent fibres are used. The use of viscose fibres is on the decline as a result of the above-mentioned reasons, among others, and moreover for the reason that the procedures applied in manufacturing viscose fibres comprise steps in which substances highly deleterious to environment are used. For this reason considerable need exists in the market of fibres by which could be obtained properties such as porosity, strength, water absorptivity, etc. Particularly, a need exists of fibres which yield said textile properties in fibre products which have been manufactured applying wet procedures.
The present invention concerns a fibre product which contains fibres possessing bonding agent properties. Bonding agent properties are here understood to mean that the fibres possess bonding agent properties in relation to another fibre, or that they possess bonding agent properties in relation to themselves, in which case the fibre product may even be composed exclusively of bonding agent fibres. In the standard case, the effect of the invention is best evident in the case that the fibres to be bonded have no inherent bonding properties. It is also possible, in forming the product, to make use of mechanical procedures which improve, for instance, the wet strength or dry strength of the fibre web or endow it with some other advantageous properties.
The object of the present invention is a non-woven fibre product which totally or partly consists of fibres which are able to form bonds with natural or artificial fibres of the same or different type. One object of the invention is a non-woven fibre product which contains natural or artificial fibres devoid of binding p
REFERENCES:
International Dissolving and Specialty Pulps Conference Proceedings, K. Ekman et al., 99-104 (1983).
Eklund Vidar
Fors Jan
Mandell Leo
Meinander Kerstin
Selin Johan-Fredrik
Cannon James C.
Neste Oy
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