US1716781A - Apparatus for spinning solutions of cellulose ethers or esters - Google Patents

Description

June 11, 1929. v, M. KLEIN 4 1,716,781

APPARATUS FOR SPINNING SOLUTIONS QELLULOSE ETHERS OR ES TERS Filed March 27, 1928 I ll l 1/ D G 1/ 1 1 [1ND Patented June 11, 1929.

UNITED STATES 1,716,781 PATENT OFFICE.

MELI ITTA KLEIN, OF VIENNA, AUSTRIA, ASSIGNOR TO RUTH-ALDO COMPANY, TNCOR- PORATED, OF NEW YORK, N. Y.

APPARATUS FOR SPINNING SOLUTIONS OF CELLULOSE ETHERS OR ESTERS.

Application filed March 27, 1928, Serial No. 265,159, and in France June 24, 1927.

My pending patent application No. 265,318 filed March 27th, 1928, describes improvements in apparatus for spinning cellulose ethers or esters in a descending direction. Said improvements consist, on the one hand, in admitting cold air through the top of the spinning chamber, by the side of the spinning nozzle, the exhausting and heating being effected in the lower part of the chamber; and, on the other hand, in providing at a suitable level in the spinning chamber a diapl'iragm which divides the chamber into two compartments and which is mounted in such a way as to enable the thread to pass through.

By way of example, the specification of the aforesaid patent application describes and illustrates a horizontal diaphragm consisting of two portions, the one being fixed.

and the other being movable and provided with a notch of suitable shape with a View to enabling it to be lowered when the apparatus is started, whilst a sliding or rotating piece closes said notch.

In certain cases, there is no need to provide a diaphragm of such complex structure; and the object of the present application is precisely to provide a simpler solution, based on the same general principle.

In fact, it has been ascertained by experiments that, if the aspiration of the air laden with the vapours of the volatile solvents, and the admission of cold air, be properly regulated, it is not essential that the diaphragm should completely obstruct the cross section of the chamber or cell. On the contrary, the spinning proceeds under satisfactory conditions if the diaphragm extends merely over a large portion of said cross section. Under these conditions, the diaphragm may be disposed in a fixed position, the pivotable portion being entirely dispensed with. In such case, however, the free edge of the diaphragm should be as close as possible to the passage of the thread.

To make the matter clear, Fig. l of the accompanying drawing represents a spinning chamber provided with this improvement. Fig. 2 is a similar View of another embodiment of the invention.

These figures display certain constructional members already represented in the specification of the aforesaid patent application, namely, the chamber or cell ABGD, with the upper holes E and E for the admission of the cold air, at the side of the spinning nozzle F, and the thread H travel-' ing from above downwards and being Wound on the bobbin I situated in the lower part of the chamber.

The diaphragm MP in the present instance is fixed and does not extend over the whole cross section of the cell. In the example, this diaphragm is disposed obliquely, but it may equally well be horizontal, the essential condition to be fulfilled being solely to leave free the space between the edge P and the opposite wall AC of the cell. This distance should be such that, having regard to the aspiration and to the current of air originating in the top of the chamber, the warm air and vapours in the zone below the .diaphragm cannot ascend into the upper zone.

Fig. 2 of the accompanying drawing shows the arrangement, in the interior of a cell, of a series of diaphragms MP, M P TM P M P which are fixed, obliquely mounted and arranged hither and thitherin relation to the passage of the thread, each of said diaphragms extending over only a portion of the cross section of the cell in accordance with the above principle. Preferably each of said diaphragms is fixed, without any movable parts; it obstructs about half the transversal section of the cell; in this manner, each group of diaphragms MP, M 1 and M 1 M 1 obstructs about the whole of the transversal section of the cell. In the form shown in Fig. l the cell is divided into two zones, and in Figure 2 the cell is divided into three zones.

I claim 1. Apparatus for use in spinning artificial thread, comprising a spinning cell, a downwardly directed spinning nozzle in the upper part of the cell, means for admitting cold air about the spinning nozzle and the thread issuing therefrom, and at least one diaphragm obliquely disposed in the cell and extending partly over the area thereof.

2. Apparatus for use in spinning artificial thread, comprising a spinning cell, a downwardly directed spinning nozzle in the upper part of the cell, means for admitting cold air about the spinning nozzle and the thread issuing therefrom, at least one diaphragm obliquely disposed in the cell and extending partly over the area thereof, and means whereby hot air and solvent vapours can be drawn from the lower part of the cell below the diaphragm.

3. Apparatus for use in spinning artificial thread, comprising a spinning cell, a down-.

wardly directed spinning nozzle in the up per part of the cell, means for admitting cold air about the spinning nozzle and the thread issuing therefrom, and a plurality of diaphragms spaced apart within the cell and each extending partly over the area thereof so as to leave a free vertical passage for the thread issuing from the nozzle.

4. Apparatus for use in spinning artificial thread, comprising a spinning cell, a downwardly directed spinning nozzle in the upper'part of the cell, means for admitting cold air about the spinning nozzle and the thread issuing therefrom, a plurality of diaphragms spaced apart within the cell and each extending partly over the area thereof so as to leave a free vertical passage for the thread issuing from the nozzle, and means whereby hot air and solvent vapours can be drawn from the lower part of the cell.

5. Apparatus for use in spinning artificial thread, comprisinga spinning cell, a downwardly directed spinning nozzle in the upper part of the cell, means for admitting cold air about the spinning-nozzle and the thread issuing therefrom, and a plurality of spaced diaphragms obliquely disposed in cold air about the spinning nozzle and the thread issuing therefrom, a plurality of spaced diaphragms obliquely disposed in the cell and each extending partly over the area thereof so as to leavea free vertical passage for the thread issuing fromthe nozzle, and means whereby hot air and solvent vapours calri be drawn from the lower part of the In testimony whereof I afiix my signature.

. MELITTA KLEIN,

issuing from the

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