US2202041A - Process for obtaining crepe effects on fabrics - Google Patents

Description

PROCESS FOR OBTAINING CREPE EFFECTS ON FABRICS Hans Altwegg, Paris, France, and Armin Eichler, Freiburg in Breisgau, Germany, assignors to E. I. du Pont de Nemours & Company, a corporation of Delaware No Drawing. Original application April 6, 1931,

Serial No. 528,240. Divided and this application October 2, 1937, Serial No. 166,984. In Germany April 11, 1930 2 Claims. (Cl. 28-1) Crepe effects are generally obtained on materials by the use of highly twisted warp or weft threads and special eifects are obtained by definite alternation of warp or weft yarns, highly treatment with an aqueous medium. The treatment can be performed separately or simultaneously with another step in manufacture, as, for example, with the treatment in the bath for twisted to left and to right. This process can be removing the dressing or in the dye bath. applied to artificial silks which, like viscose silks, for example, consist of regenerated cellulose. Example I h Fabrics which eonta'm as warp Weft Ordinary acetate silk threads of 75 deniers ighly twisted viscose yams Show a Valuable P with 24 individual threads and an arrangement meet on being treated with warm t that i of 51 threads to the centimeter are used for the for example after having been subleeted e warp of a fabric, the weft consisting of acetate Process for removing the dressing a dyemg silk thread containing 10% sodium lactate, twisted e T1115 results from the feet that highly alternately left and right, of the same standard twisted Viscose yams Possess the property on of fineness, having 2800 twists per meter and an mg treated with water or w aqueous solutions arrangement of 30 threads to the centimeter. of all kinds cutting and slmulteneeusly shrmk' After weaving, the material is treated in a bath ti tlt ili iis l stiii ilfl s fhfii ifitfii lifi with pure Water at this way a beau" B s tiful cre effect similar to cre -de-Chine is obtreated in the way indicated, distortion of the tained pe pe 22:12: takes place resulting in the so-called crepe Example 11 However, if this method of treatment is applied A skein of 100 denier cellulose acetate thread to fabrics, the warp or weft of which consists g f ii gi gg fi gg gz fgfig g fs aggi g; of highly twisted threads of acetyl cellulose, the S crepe effect either does not occur at all or else 15% by welgtlt of sod-mm lactate and t allowed only to an extent which is hardly noticeable. to Seek mmutes at F. 'lglhe skgan is then The highly twisted acetate silk threads do not takentmm the bath and whine P minutes possess therefore, or in any case only to a slight in an extractor to remove e aJOr portion of extent, the property of curling and shrinking in t fi fi g g gg' gz ifi ig ii gg ggfiz contact with warm water. mg ap 30 It has now been found that highly twisted on the basis of the dry cellulose acetate, and threads of acetyl cellulose acquire the property optionally a standard yarn dressing composition, of producing valuable crepe efl t in fabri s is given a crepe twist, for instance, 60 turns per When treated with water if they contain inch, and is emplczyed as the vzefit nil:1 fflblf C01;- Stances which have forwater a high m taining lowly twis ed regenera e co ose rea s Such Substances belong to various classes of bodies as the Warpg BY means of the customary a and include, for example, inorganic salts, such a retmetlen of t much as 15% occurs as calcium chloride or nitrate, or salts f the formation of desirable crepe effects on the ganic acids, such as those of lactic acid. fabric- The selected substance may be incorporated Example In l into the threads in various manners. Prefer- Approximately 5% by weight of sodium lactate y, e selected substance is incorporated in is applied to 100 denier cellulose acetate thread the threads prior to the weaving of said threads consisting of 32 filaments twisted 2.5 turns per i to i sprior to the high twisting of the inch during the thread travel to a takeup bobbin yarn. Specifi the Selected substance is in a coning, spinning or crepe twisting operation. co p in the yarn by impregnating a Skein The sodium lactate is applied to the thread from or the ram wi a Solution thereof or pa i a 15% aqueous solution of sodium lactate by the y through a solution thereof during the means of a rotating roller, capillary wipers or throwing operation or it is incorporated into the 1ik device in whichthe upper portion of the spinning solution from which the thread is spunapplying device contacts the thread and the Inorder to obtain crepe eifects, acetate silk yarns which contain such substances as have been mentioned above are highly twisted and made to constitute the warp or weft of the fabric. The fabric thus obtained is thereupon subjected to a lower portion contacts the sodium lactate solution. After inserting a crepe twist of about turns per inch and after weaving into a fabric,

a good quality crepe is secured by submitting the fabric to a customary aqueous boil-off.

Example IV Sodium lactate, dissolved in a mixture of acetone and water, is added in sufficient amount to a cellulose acetate spinning solution to yield a spinning solution consisting of 2% sodium lactate and 20% cellulose acetate dissolved in a solvent mixture of 85% acetone and 15% water. The modified spinning solution is converted into a '75 denier thread consisting of 24 filaments and the thread is given a crepe twist of about turns per inch. After weaving the crepe twisted thread into fabrics, and after treating the resulting fabrics with an aqueous bath at a temperature of C., a beautiful creped effect similar to crepe-de-Chine is obtained.

It is to be understood that the invention is not restricted to the specific details set forth in the examples. For example, by varying the concentration of the sodium lactate solution or time of immersion of the yarn in the solution, a greater or lesser quantity of sodium lactate may be incorporated into the yarn. Satisfactory results have been secured in processing skeins as described in Example 11 by incorporating 4.5%

to 24.3% by weight of sodium lactate on the thread by using an aqueous bath containing 5% to 30% sodium lactate. Also, in the travelling thread method as described in Example III, satisfactory results have been obtained by using 15% to 25% aqueous solutions of sodium lactate to incorporate 4.8% to 5.6% by weight of sodium lactate on the dried threads.

This application is a division of application Serial No. 528,240, filed April 6, 1931, now Patent No. 2,107,657.

We claim:

1. A process for producing crepe effects on fabrics which comprises fabricating highly twisted cellulose acetate yarns containing sodium lactate into a fabric, and treating the fabric with an aqueous medium.

2. A process for producing crepe effects on fabrics which comprises fabricating highly twisted cellulose acetate yarn containing up to approximately 10% sodium lactate into a fabric and treating the fabric with an aqueous medium.

HANS ALTWEGG. ARMIN EICHLER.