US2006543A - Textile fabric - Google Patents

Description

Patented July 2, 1935 UNITED STATES,

PATENT OFFICE Serial N 0. 444,819.

Divided and this application February 1, 1934, Serial No. 709,331. In Great Britain April 29, 1929 Claims. (01. 117-52) This application is a divisional application from application S. No. 444,619 filed 15th April, 1930, and the invention relates to the production of textile fabrics, and more particularly woven 5 fabrics.

The object of the invention is to simplify or improve the production of crepe-like or "flgured or pebbled effects in woven fabrics.

The. method of producing crepe fabrics as ordinarily practised consists in employing as weft or both weft and warp two kinds of thread, each highly twisted, the twist of one being in the opposite direction to that of the other. These twothreads alternate with each other in the fabric, the usual arrangements beingeither one thread of one kind alternating with a thread of the other kind, or an alternation of pairs of like threads, and in either of these arrangements, each weft thread is contained in a separate shed. After the fabric is woven, it is subjected to shrinking, and the consequent contraction of the high twist threads produces the crepe effect re; quired.

According to the present invention, crepe or like effects are produced by the use of a composite thread consisting solely of two threads, at least one of which is highly twisted. Preferably both are highly twisted, but in opposite directions. The high twist threads may be doubled with low twist threads before their association into the composite threads.

For use as weft, the two threads may be simply parallel wound on to a weft pim or other weft package. They may be sized together before winding, if desired. The two threads may be doubled together, this form of composite thread being capable of use both as a weft and as a warp thread.

A preferred form of composite thread, capable of use both as weft and warp, consists of two threads highly twisted in opposite directions, and doubled together. The doubling should be light in comparison with the degree of twist imparted to each thread.

The invention may be used for the production of crepe-like effects in all kinds of materials. Thus, the component threads may consist of lilaments of cellulose acetate or other organic derivatives of cellulose, which materials do not give good crepe effects by the normal methods employed. Likewise, threads of natural silk, cotton, wool, or artificial silk of the reconstituted cellulose type may be used, the crpe effect being evident immediately on weaving the fabric. If desired, shrinking may be resorted to to enhance the creping of the fabric.

The component threads in the composite threads may be of like or unlike counts or denier, colour, or composition. Thus, for example, a 5 composite thread may consist of one thread of cellulose acetate, and one thread of natural silk, cotton, or wool.

By the use of composite threads according to the invention, it is not necessary to employ a 10 multi-box loom-in order to produce the crepelike effects, since the effect produced does not depend on the use of two kinds of weft thread.

It is, however, within the scope of the invention to use two kinds of composite thread, of the same 15 or different composition, one thread being doubled in the opposite direction to the other, in which case a two-box loom is necessary for the weaving of the fabric. Again, shrinking of the fabric may be resorted to, particularly when the 20 fabrics consist of or contain materials which are normally subjected to shrinking in ordinary crping processes.

The following are given as examples of composite threads which are particularly suitable for 25 producing crepe effects in fabrics of cellulose acetate, but it is to be understood that the invention is not in any way limited thereby.

Example I A composite thread is formed from two 75 denier threads of cellulose acetate, one'having turns per inch of left-hand twist and the other 55 turns per inch of right-hand twist. The two threads are doubled together with 10-12 turns per 35 'inch in either direction.

Example II p A composite threadconsisting of a 100 denier thread of cellulose acetate having turns per 40, inch ofright-hand twist and a denier cellulose acetate thread having 40 .turns per inch of lefthand twist, the two threads-being doubled together with 20 turns perinch of left-hand twist.

This thread may be used alone in a single-box 45 loom, or in a two-box loom alternately with another composite thread consisting of a denier cellulose acetate thread having 60 turns per inch of left-hand-twist and a 70 denier cellulose acetate thread having 40 turns per inch of right- 50 hand twist, doubled together with 20 turns per inch of right-hand twist.

The threads described in the above examples may be used as weft or warp alone or as both warp and weft to give excellent crepe-like effects. n

Where the oppositely twisted threads of the second example are used, it is convenient to insert two picks of one thread alternately with two picks of the other thread.

What I claim and desire to secure by Letters Patent is:

1. A method of weaving crepe fabric which consists in laying in a single warp shed separate and oppositely twisted filling ends, the separate ends being non-intertwisted with one another.

2. A method of weaving crepe fabric which consists in simultaneously withdrawing from a single bobbin two separate and oppositely twisted filling ends, the separate ends being non-intertwlsted with one another; and laying the non-intertwisted ends within a warp shed.

3. A method of weaving crepe fabric which consists in laying in successive warp sheds a pair of separate and oppositely twisted filling ends at each pick, the separate ends being non-intertwisted with one another.

4. A crepe fabric comprising a series of warp strands and a series of separate filling strands of alternately opposite twist, each shed of warp strands embracing two filling strands of opposite twist, the two filling strands in each warp shed being separate from one another and non-intertwisted.

5. A crpe fabric comprising a series of warp strands and a series of separate filling strands of cellulose acetate or alternately opposite twist, each shed of warp strands embracing two filling strands of opposite twist, the two filling strands in each warp shed being separate from one another and non-intertwisted.

HENRY DBEYFUS.