Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1980-07-28
1984-06-12
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156291, 156305, 427271, 427288, 427307, 427336, 427359, 427368, 4273899, 427412, 428198, 428261, 428288, B32B 3116
Patent
active
044539940
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for increasing the cover of textile fabrics produced from yarns, at least part of which yarns exhibiting potential fiber-spreading properties, which can be activated by removing from said yarns, processed into a fabric, the adhesive used for the fiber bonding in the yarn by means of a suitable solvent; the invention further relates to the fabric obtained by applying said method.
The U.S. Pat. No. 3,447,310 and 3,877,214 describe a method for the manufacture of twistless yarn with the possibility of removing from this yarn, processed into a fabric, the adhesive used for the fiber bonding in the twistless yarn by means of a suitable solvent. The "Lenziger Berichte", May 1977, issue 43, page 9, states that the fibers in a fabric, manufactured with twistless yarn, whereby the adhesive has been removed from the twistless yarn are of such mobility that they are able to spread in the plane of the fabric, contributing to a greater cover and a higher lustre of the fabric. For this reason, potential fiber-spreading properties are attributed to twistless yarn.
The invention has for its object to provide a new application not only to such a twistless yarn but in general to yarns with potential fiber-spreading properties, after they have at least been processed into a fabric.
According to the invention the selected number of warp and weft threads per unit area is so low that on the one hand an optimal fiber spreading is realisable but, on the other hand, after the activation of the potential fiber-spreading properties, sufficient cohesion of the fibers in the fabric remain for further processing, while after obtaining the desired fiber spreading, the fiber bonding partially lost through the activation is at any rate partially restored.
That is, through washing out the adhesive used for the fiber bonding in the yarn with the potential fiber-spreading properties, the cohesion of the fibers in the fabric is strongly reduced. The fiber bonding still remaining in the fabric is the result of the mutual fiber friction determined by the fabric structure. The remaining fiber bonding should of course be sufficient for further processing of the fabric; this bonding thus determines the minimum weave density. An optimal fiber spreading is however achieved only if the weave is sufficiently open; the requirement of a certain minimum fiber spreading determines the maximum weave density. The latter maximum limit is however such that below this limit the remaining fiber bonding will readily be so slight that the fabric is too weak for many applications. It is therefore necessary to restore the fiber bonding that was lost through the activation.
The invention and its advantages will now be described in more detail with reference to the accompanying figures, of which:
FIGS. 1A, B and 2A, B show a number of fabric fragments to illustrate the fiber spreading according to the invention; and
FIGS. 3 and 4 are diagrams useful in explaining the invention and one of the advantages attached to a fabric structure according to the invention.
As already stated, potential fiber-spreading properties can be attributed to a twistless yarn. There are however other yarns exhibiting such properties. In addition to the above twistless yarn consisting of staple fibers, there is a filament yarn as such, consisting of continuous filaments which may be bonded together by an adhesive. It should be possible to remove this adhesive from the filament yarn processed into a fabric by means of a suitable solvent. The spreading of the continuous filaments incurred in the fabric with the use of the filament yarn will however be less than with twistless yarn consisting of staple fibers. The yarn as described in the Dutch patent application No. 75.07442 also exhibits potential fiber-spreading properties. This yarn consists of a filament yarn to which stable fibers are affixed with an adhesive that again, as described in the cited Dutch patent application, is removable from the yarn, processed into a fabric by means of a suitable solvent.
REFERENCES:
patent: 3512232 (1970-05-01), Bolinger
patent: 4159360 (1979-06-01), Kim
Dawson Robert A.
Hollandse Signaalapparaten B.V.
Spain Norman N.
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