US2131409A - Washing, desulphurizing, bleaching, finishing, and like treatments of artificial yarns - Google Patents

Description

A. NAI

Sept. 27, 1938.

WASHING, DESULPHURIZING, BLEACHING, FINISHING,

AND LIKE TREATMENTS OF ARTIFICIAL YARNS Filed June 6, 1956 vlniflilllllllilllllllll Patented Sept. 27, 1938 UNITED STATES PATENT OFFICE WASHING, DESULPHURIZING, BLEACHING,

FINISHING, AND 3. 1m: TREATMENTS, or

. ARTIFICIAL 'YAR Alfredo Nai, Milan, Italy, assignor to Chatillon Societa Anonima Italiana per le Fibre Tessili Artificiali, Milan, Italy Application June 6, 1936, Serial No. 83,998 a In Italy April 9, 1936 1 Claim.

cut when still acid while in the otherthe cutting occurs after washing and in some cases after de- 1 10 sulphurizing, bleaching, dyeing, and the like operations have been effected.

It has been shown that processes of the sec-' ondtype present remarkable advantages over processes of the first type and-in order to render more rationalthe washing and subsequent treatments various provisions have been made and adopted some of which are the subject matter of patents.

According to some of said processes the bundle 20 of continuous filaments is passed through a shower of water in the washing, and under a. shower of the solutions required for the other treatments: according to others the washing and treatments are executed on the silver immersed 25 in a vat or open channel.

In the specification of another patent of same applicant a process is described for washing, desulphurizing, bleaching and dyeing artificial yarns in countercurrent in open channels.

According to the invention the washing, desulphurizing, bleaching, dyeing or other finishing treatments are efiected in one or more tubes through which water or other liquid appropriate for the treatment of the yarns or filaments is caused to travel, so entraining the bundle of filaments or sliver.

Preferably in accordance with the invention the liquids are admitted into the tubes in which the treatment is effected by means of an injector,

40 the liquid thus being caused to entrain the yarn,

bundle of filaments or sliver.

The invention extends also to apparatus for carrying the invention into eiIect, such apparatus comprising a tube or a series of tubes each 5 of which is connected at oneend with an injector and discharging into a vat or channel intended for the collection of the liquid and preliminary separation of the bundle of filaments from the liquid.

50 Y The treatments effected in accordance with the invention take place under pressures above atmospheric pressure, and this intensifies the action of the reagents and considerably reduces the duration of the different treatments and the 55 quantities of water and/or solutions required.

The treatment is highly favored by the fact that the liquid entraining the sliver and running at a speed much higher than that of the sliver opens the sliver in such a way that the fibres are uniformly distributed throughout the cross section of the tube, consequently there is a rapid exchange of liquid which results in an intimate contact with the fibres.

By the process according to the invention ex-. cellent results are obtained'in washing, desulphurizing, bleaching, dyeing and the like treatments of artificial yarns in a very short time -with the employment of a very simple device which does not occupy a great deal of space.

At the outlet of each tube the sliver is caused to pass over a grid consisting 01' glass bars or other materials resistant to the chemical action of the liquid used for the treatments so that the greater part of the liquid may be separated from the fibres, these fibres being then conveyed to a squeezing device comprising either chamfered or grooved rollers pressed against one another or' preferably only by a series of rollers on which the sliver is wound and by which the liquid is expelled by centrifugal force.

Apparatus in accordance with the invention is illustrated schematically and by? way of example in the accompanying drawing.

The bundle of filaments, sliver or yarn passesv through the funnel I into the body of the injector 2 into which by way of the tube 3 is admitted the washing water as the other liquids appropriate for the various treatments. The bundle of filaments or sliver in continuous contact with the liquid passes through the tube 4, being delivered in to the vat or channel 5 in which is arranged a system of squeezing bars 6 of glass, porcelain, ebonite and the like, these bars having the object of allowing the separation of the excess of liquid without the bundle or sliver becoming tangled. The bundle or sliver is then caused to pass round the squeezing rollers 1 before being conveyed into a subsequent tube. For a bundle or sliver having a titre of 300,000 denier with a speed of travel of 100 metres per minute, tubes may be used, for instance of 30 mm. diameter and a length of 20 to 40 metres for each treatment. Each treatment requires one or more tubes, for instance for the washing of the sliver impregnated with the spinning bath threetubes, are employed the water being recovered, that is the water discharged from the third tube is injected in the second tube, and the water discharged from the second tube used for feeding the first tube. For the treatments of desulp'hur izing, and bleaching only one tube is required for each treatment while for dyeing one or more tubes are used according to the coloring substances employed.

The treatments disclosed may be also used forartificial yarns oi regenerated cellulose even when they are not destined for the production of short or staple fibres. In this case the groups" of filaments coming from the spinning machine are gathered on appropriate collectors.

For the production of short fibres the bundle of filaments is cut by means of apparatus appropriate for-the purpose.

Having now particularly described and ascertained the nature of my said invention and in said yarn. through said tube in a longitudinal direction and so as to keep the yarn taut.

AM Mr. 11

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