US2087946A - Process for finishing artificial thread - Google Patents

Description

Patented July 27, 1937 .This invention artificial thread. tion relates to the from cellulosic solutions such as viscose.

more particularly,

improvement in the handling and` regenerated cellulose threads.

In the method 2,087,940 4 :rnocEss Foa rINIsmNG ARTIFICIAL THREAD Charles Chatin, Izieux, France, assigner, bymesne assignments,

Delaware! to E. I. du Pont de Nemours 8s Company, Wilmington, Del.,

a* corporation of Application october zz, 1931, semina. 510,474

In France October 22, 1930 l 1l Claims.

relates to the production of More particularly, this invenproduction of artificial thread Still the invention relates to an purifying of of making artificial thread wherein a solution of cellulosic material is able thickness 10 formed into threads and woundto a consideron a rigid bobbin and wherein thethread is subsequently puried and dried on the bobbin, the outer windings of thread, laid on the compressible under windings, 15 considerably in 'the purification and drying,

which are shrink whereas the windings close to the rigid core are prevented from shrinking. This causes the finished thread to have uneven denier, varying strength, and dyeing characteristicsl which are not uniform. In

the past it has been found,

20 desirable to take the spunV thread from the bobbin and reel it into loose or to'spin it onto non-rigid bobbins. These tion,

skeinsV before purificaprocesses have not been entirely satisfactory,

however, because,

25 acquires broken filaments, knots,

or broken threads the first process the yarn kinks and cut through handling, and in the second processl imperfect equalization and purification result.

It is an object 30 the manufacture of r the invention to of this invention to improve of rayon.

It is another object improve the handling and purication of rayon threads of the regenerated cellulose type which have been spun on bobbins. 35 Other objects of the invention will be in part apparent and in part set forth as the description proceeds.

These objects are accomplished 'by winding' purification. upon a bobbin. rewinding with twistsecond bobbin .which is preferably provided with a liquid-permeable, collapsible, removable core, and re- \mo,ving the wound cake from the vbobbin before treating.

In the accompanying drawing, Figure 1 is an `elevation showing the rewinding; with one form of Figures 2 and collapsible covering; Figures 3 one method of accomplishing 2a show a bobbin and 4 show a bobbin with a collapsible covering used to protect a wound cake of rayon; Figure. 5 villustrates one method of arranging the second bobbin for windingl v *l In Figure 1, numeral I indicates a bobbin;

2 is a cake of ray on wound upon the bobbin; 3

d; 4 is a guide for the rayon bead, Aor with a bead of size insumcient to prevent the easy withdrawal of the rewound cake;

I0 is a collapsible covering consisting in this instance of a cloth having projecting ends which may be tucked inside the bobbin (as in Figure 3) during winding.

In Figure 3. numeral 2l is rayon which may be provided, as shown, square ends, or with bevelled ends.

In Figure 4, the cloth covering i0 has' been Withdrawn from the interior of the bobbin 8 and folded in protecting position over the outside of the cake. After the cake has been thus protected, it will be slipped off the bobbin, as indicated in dotted lines. and processed.

-In Figure 5, numeral 9 indicates generally the rewinding frame which comprises two wheeliike ends connected 'by an axle, 92,1which is preferably integral with one of the wheel-like ends but not with the other; 93 is a nut on the end of the axle, by means of which the rewind bobbin may be clamped between the wheels of the frame.- In operation these wheels run upon and are driven by the surface of roller 9| as shown'in Figure l. y

In the practice of this invention the threadmay be either in the gel or in the dried state.

A gel thread is one that has not been dried to equilibrium after being formed. A dri-ed thread is one that has been brought to its equilibrium or standard moisture content. i

A cloth -covering for the rewind bobbin has been illustrated in the drawing. but coverings of ,other materials. such as suitable paper. or cardboard coverings, may be used and, since they collapse in the purifying liquid, need not be removed before purification.

An advantage of my invention is an improvement in the quality of the yarn produced, as. compared with customary methods. This imy proveme'nt appears yparticularly in the increased uniformity of the thread and in its improved and more'l uniform dyeing properties. Yet another advantages lies in the improved meQiod of han- I a rewound cake of with dling. Other advantages will be apparent to those skilled in the art.

As many apparently widely different embodiments of this invention may be made Without departing from the spirit and lscope thereof, it is to be understood vthat I do not limit myself to the specific embodiments thereof except as defined in the appended claims.

I claim:

1. In the manufacture of rayon, the process which comprises spinning rayon in cake form upon a. bobbin rewinding with twisting into cake form upon a second bobbin, and removing the cake from the second bobbin before purifying the cake.

2. In the manufacture of rayon, the process which comprises spinning the thread upon a` bobbin, re-winding with twisting upon a second bobbin having a permeable collapsible covering capable of being placed 4in position to protect the cake, removing the cake and covering from the bobbin, and purifying it.

3. In the manufacture of rayon, the process which comprises spinning the thread upon a bobbin, re-winding with twisting upon a second bobbin having a clothl covering, folding the cloth overthe wound cake, removing the cake from the bobbin, and purifying it.

4. In the manufacture of rayon, the process which comprises spinning the thread in the gel state upon a bobbin, re-winding the gel thread with twisting upon a second bobbin having a cloth covering, folding the cloth over the wound cake. removing the cake from the bobbin, and purifying it.

5. In a method of treating spun filaments, the steps of spinning the filaments on a bobbin, rewinding and twisting the filaments onto a second supporting means, removing the filaments in the form of a. cake from this second support,

and wet treating the said cake.

- 6. In a method of treating spun filaments, the steps of spinning the filaments on a bobbin, rewinding and twisting the filaments onto a second supporting means, said means being covered with va covering prior to the rewinding of the filaments thereon, removing the filaments in the form of a cake from this second support, and wet treating the said cake, said covering acting to keep the filaments from tangling or knotting.

'7. In a process of the class set forth, the steps of drying spool-spun filaments, rewinding and twisting them onto a second support, removing the filament body soformed, as a unit, and subjecting this body to aftertreatment and drying while in an unsupported state.

8. In a process of the class set forth, the steps of drying spool-spunv filaments, rewinding them onto a second support to form a filament body comprising a tightly Wound cake, removing the filament body so formed, as a unit, and subjecting this body to aftertreatment and drying While in an unsupported state.

9..In a process of the type descrid, the steps of spool spinning and drying filame ts, rewinding the yarn into a tight cake onto second supporting means from which the cake may be removed bodily, removing the cake bodily and then Wet treating and drying it while it is in an unsupported condition.

10. In the production of even shrinkage yarn, the steps of spinning filaments on a bobbin, rewinding onto secondary supports, removing the filaments bodily from said secondary supports, and wet treating and drying them unsupported.

11. In the manufacture of rayon the vprocess which comprises spinning rayon onto a bobbin, withdrawing the rayon while rotating the bobbin and rewinding the rayon onto a second bobbin before purifying the rayon.

CHARLES CHATIN.

Images