US1742568A - Treatment of yarns or threads - Google Patents

Description

Patented Jan. 7, 1930 UNITED STATES PATENT OFFICE CHARLES WESLEY ADDY, JOSEPH BILLING, AND HAROLD HALKYABD, OI SPONDON, NEAR DERBY, ENGLAND, ASSIGNOBS TO CELANESE CORPORATION OF AMERICA, A

i CORPORATION .OF DELAWARE TREATMENT or YARNS on mums No Drawing. 7 Application filed August 28, 1926, Serial N6. 181,116, and in Great Britain June 4, 1928.

This invention relates to a process of'sizing and dressing yarns or threads in general for weaving, warp or circular knitting or other textile purposes, and is applicable to yarns composed of or containing natural fibres or cellulose acetate or other artificial filaments or fibres.

Hitherto the sizing of yarns has usually beenperformed on slashing machines or the 10 like, in which lengths of yarn are unwound and passed continuously through a receptacle containing a farinaceous or other. paste and then between pressure and clearing rollers to remove excess of size, the yarn being afterwards dried and wound continuousl on to a beam or other convenient carrier. anks of yarn have also been dipped in a receptacle containing size, squeezed to remove excess of size and afterwards allowed to dry.

These methods of sizing and dressing yarns have a number of drawbacks-for instance the pressure rollers frequently get out of condition for lack'of attention-but despite many attempts have not so far been superseded.

According tothe present invention, packages of yarn or thread, wound'on bobbins, cops,.pi rns,'tubes, spools or similar carriers are immersed in a solution of a sizing or dressing agent (hereinafter termed a sizing agent) in a volatile solvent until they are thoroughly impregnated therewith, the ack- -ages of yarn orthread are then remove and the yarn or thread is dried by evaporation of the solvent and wound continuously on to. banking frames, bobbins'or other usual ,or desired carriers for the sized or dressed yarn or thread. I

The drying is conveniently eifected during the operation of winding the yarn or thread onto the final carrier, but may also be performed wholly or partly while the yarn isstill in its original package and before the winding operation takes "place. The yarn or thread may even be allowedto dry slowly on the bobbin or other original carrier,- and then be stored and Wound ofi when required.

According to the nature of the sizing or:

dressingagent, and the rate of drying required, various volatile solvents such for example as water, benzene, toluene or xylene maybe employed. Mixtures of volatile solvents with other solvents,cfor'instance solvents that volatilize with difiiculty, such as paraflin oil, can also be used. I

The sizing or dressing agent employed should be capable of forming a coatmg on the yarn or thread that is freefrom brittleness and liability to dust bit, and at the same time is free from stickiness. Sizing compositions of a suitable .character are described and claimed in British Patent Specifications Nos. 244,947 and 244,979, andin the corresponding U. S. specificationsSNos. 728,799

and 728,800, which disclose a number of mixtures of resins or metallic resinates or naphthenates with non-drying oils, fats, waxes or fatty acids, and also solutions of such mixtures in volatile solvents.

Convenlently the inventionma'y becarricd into effect in the following manner. Packages of yarn or thread wound onsuitable .car-'.

-riers are placed in a vessel. provided witha closure which can be rendered air ti ht.

The vessel is then evacuated and a solution When the impregnation is complete, the yarn' so nately as often as may be necessary to ensure complete impregnation of the package.

is removed from the vessel and wound olf di-. rectly on to hankingframes or on to bobbins or ther carriers under such conditions that, 1

during the passage of the yarn from the origi nal to the final carrier, the solvent is evapprated, leaving an even layer of the sizing or dressing agent on the yarn. The evaporation of the solvent may be efie'cted at ordinaryii,

room temperature. but if desired or necessary,

the yarn or thread maybe passed over a hot plate or steam pipes in order to facilitate the 1 evaporation, or may be subje ctedto'theac tion of currents of air or other gas or vapour aided, if desired, by the a plication of heat or reduced pressure for the same purpose.

The evaporated solvent may be recovered by absorption or condensation any ofthe 100.

methods commonly employed. As previously stated, the solvent may be wholly or partly evaporated before the package is unwound. Thus, for instance, the packages of yarn or thread may be stored for any desired period in chambers through which a current of warm air may be passed or allowed to circulate, and then, after the evaporation of the solvent has been completed, or has proceeded to any de-' sired extent, the packages of yarn may be removed and wound off on to the final carrier. the evaporation of the solvent being completed when necessary during the winding operation.

The amount of size or dressing deposited on the yarn or thread may be varied in accordance-with requirements by varying the concentration of the solution used.

What we claim and desire to secure by Letpressure, immersing the package while still under reduced pressure 1n a solution of a suing' agent in a volatile solvent, and, after the 2 Process for sizing yarn, comprising impre pac age wound on a carrier with a solution of a swing agent in a volatile solvent, separating the package of impregnated yarn from the excess sizing solution, unwinding the yarn from its original carrier, drying the yarn by evaporation of the solvent, and winding it on to the package to conditions permittin the evaporation of solvent, and afterwar s unwinding the yarn from. its original carrier under conditions permitting evaporation of residual solvent, and winding it on to a carrier for the sized yarn, the unwinding andwinding being effected in a continuous operation.

4. Process for sizing yarn, comprising impregnating yarn while in the form of a package wound on a earner with a solution of a sizing agent in a volatlle solvent, exposing the package to conditions pefmitting evaporation of solvent, and afterwardsunwindin the yarn from its original carriers-andwin ing it on to a carrier for the sizedkyarn, the

. unwinding and winding efiected in a continuous operation.

I 5. Process for sizing arn, com rising subject-ing yarn while in t e form 0 a package wound on a carrier to the action of reduced ating yarn. while .in the form of a sizing agent in a volatile solvent, exposing