US2244761A - Production of textile yarns - Google Patents

Description

Patented June 10, 1941 PRODUCTION OF TEXTILE YARNS John Brandwood, Birkdale, Southport, England No Drawing.

rial No. 316,273. M, 1938 1 Claim.

The present invention relates to textile yarns Application January 29, 1940, Se-

InGreat Britain December produced with discontinuous fibres, for example 7 fibres of wool and cotton, such yarns having no spinning twist, and is directed to the provision of a form of such yam which will be soft and lustrous and will serve for the preparation of fabrics therewith which fabrics are to display a soft and lustrous quality. Such yarns may for example be used in the preparation of flannelette, the softness of such a fabric lending itself excellently to the performance of the nap raising step employed in such preparation.

Various propositions have been put forward for the treatment of fibres of various kinds with adhesives so that the said fibres would adhere together as a result of adhesive left on and between the fibres. In one proposed method a textile roving was delivered from delivery rollers and a size solution rubbed into it as it passed from such rollers. This would be useless however where a soft and lustrous yarn is required, inasmuch as size, or any other adhesive left upon the fibres, forms part of the yarn as a whole and has a hardening or stifi'ening effect upon the said yarn as such.

To attain the soft and lustrous condition there should be nothing separating the individual fibres in the finished yarn, but, at the same time, the yarn should be-of sufficient tensile strength to wind and weave satisfactorily, as a yarn.

The present invention has for object the production of a textile yarn which will meetthese latter mentioned requirements, and according to such invention a textile roving or slubbing, as prepared in a. speed frame preparatory to usual spinning, is treated with a very weak solution of a substance having adhesive qualities, and then excess of the solution is cleared to the greatest possible extent from the fibres-upon which it has been deposited. The strength of the solution is so selected that whilst after it has been removed are practically speaking in a state of parallelism; will be fully appreciated by those skilled in the art, and in many other uses the softness and lustre of the yarns, as against spun yarns, is of advantage. 1

The roving or slubbing may be treated in any manner, but preferably, and practically, by the method set forth and claimed in the specification of British Letters Patent No. 482,817 granted to me. In that specification a liquid is forced by differential pressure through a roving or slubhing in the wound condition as it comes from the speed or fiyer frame, and the excess of liquid is cleared from the fibres by means of compressed air. The use of a dye or analogous liquor is however contemplated, 'in that specification. Any solution or dispersion may be employed for the purpose of this my present invention which will give the desired effect of frictional resistance between fibres, and as examples of materials from which solutions or dispersions can be prepared may be mentioned rubber latex, cellulose derivatives, gellatose, a soluble starch, and gums of various kinds. These whilst not being adhesives, have adhesive qualities suflicient for my purpose viz: to promote a frictional resistance between the fibres without actual fixation of the same together. For instance a dispersion of a rubber latex of any of the kinds commercially obtainable may be employed, the solid rubber contentof the same being reduced to as little as onehalf to one per cent by dilution in known manner. In employing the other materials men-- tioned, the method of preparation of solutions of the same is well known in each case, and the strength of such solutions may be one-half to one per cent, that is to say suificient to ensure that the desired degree of increased frictional resistance is obtained, without positive adhesion of the fibres, but suilicient to impart a strength to the produced yarn to enable it to withstand winding and weaving tension. The soft and lofty character of the yarns is thus ensured, which would not be. the case if the fibres wer so treated as to adhere firmly together.

An important advantage of the invention is that where the ultimately produced yarn is required in dyed condition, the solutions above referred to can be added to the dyebath. The method of dyeing being most practically that described in the specification of British Letters Patent No. 482,817 earlier referred to. Due regard being had to the weight of the batch of rovings or slubbings being dyed, the volume of solution employed, based on the strength of the same as earlier stated, can be accurately calculated. Yarn is thus produced and dyed as a single step. If it is for any reason, for example, the nature of the dyebath, though undesirable to add a solution to the latter, it may be added to the subsequent wash water.

Throughout this specification the basis of the yarn produced is referred to as a roving or slubbing. It is preferred however to take a roving as the basis, such roving having the regulation turns per inch of its length-the carrier twist.

I claim:

The method of forming a textile yarn of a soft and lustrous character from discontinuous fibers, which resides in treating a textile roving or slubbing with a dye bath containing a very weak solution of a substance having adhesive qualities to an extent sufiicient to impart increased frictional resistance only to separation of the component fibers when dried, but insuficient to efiect fixed adhesion of such fibers, finally removing any excess of the solution, and subsequently drying, whereby the production of the yarn and the dyeing of same is efiected in a single operation.

JOEE? BRANDWOOD.