DE1105104B - Device for the production of artificial threads according to the wet spinning process - Google Patents

Description

The invention relates to a device for the production of artificial threads from spinning solutions, like viscose, after the wet spinning process, whereby the spinning solution through one with numerous spinning orifices provided spinneret in a precipitation bath, z. B. a salty acid bath, is pressed.

The invention has, inter alia, the improvement of thread formation immediately on and after Spinneret bottom for the purpose, which makes it possible to spin at higher speed.

In this context, there is an increase in the spinning speed on the one hand in the case of spinning solutions, such as viscose, which are difficult to precipitate, and on the other hand in spinning baths of low precipitating power, whereby one can spin relatively slowly.

The invention offers the further advantage that almost no capillary thread breakage at the nozzle or occurs shortly thereafter.

According to the invention, it is not only possible to accelerate the precipitation, but also the friction considerably reduce the spinning bath in relation to the thread immediately after the spinneret, whereby the later stretchability is completely retained.

In addition, piecing is made significantly easier and, in a certain sense, automated, as the spinning bath carries the thread along from the spinneret.

A wet spinning process is known in which the spinning solution from a spinneret into a precipitating liquid pressed and the thread formed is pulled through a tubular channel which is against the Spinneret is widened like a trumpet and through which the liquid flows. Furthermore is the use of a guide body lying in one plane with the spinneret base is known.

In contrast to the known method, according to the invention, the spinning bath is not left at will Flow by the nozzle. Rather, the spinning bath liquid is guided in such a way that the spinning bath is exposed from all sides flows perpendicular to the spinning direction of the thread and radially inward over the spinneret base. Through this becomes the dead or critical space immediately after the spinneret, where normally almost none Current is present, reduced and shortened.

The device according to the invention for the production of artificial threads by the wet spinning process, in which a spinneret with a flat spinneret base and lines for supplying the spinning bath liquid are provided in the space in front of the spinneret bottom from its entire circumference and in which a guide body surrounding the spinneret and lying in one plane with the spinneret base and a tube coaxial with the spinneret, the end of which is directed towards the spinneret base and trumpet-like device for the production

of artificial threads
proceed according to the wet spinning

Applicant:

NV Onderzoekingsinstituut Research,
ίο Arnhem (Netherlands)

Representative: Dr. K. Schwarzhans, patent attorney,
Munich 19, Romanplatz 9

_1; j Claimed priority:

Netherlands June 17, 1954

Frans Hesselink, Arnhem (Netherlands),
has been named as the inventor

is further to form two guide surfaces for the spinning bath liquid, has the special feature that the Shortly spaced guide surfaces form a flat, disc-shaped guide path Form perpendicular to the center line of the spinneret.

Due to the flow of precipitating liquid directed in this way, the critical space, namely that otherwise in the essential flow-free, conical space, the base of which is the spinneret bottom and which Point in the thread withdrawal direction, always provided with fresh precipitating liquid. This will make the Capillary threads all relatively early or at a short distance from the base of the spinneret coagulates.

Due to the radial acceleration, the flow of precipitating liquid is retained its direction of movement perpendicular to the spinning direction up to the center of the nozzle base and thus favors the precipitation of the filaments and the shortening of the designated dead Space and by the change of direction there switches the harmful friction of the thread on the spinning bath immediately after the spinneret base.

The flow rate of the precipitating liquid after the turning of the stream in Align the spinning direction shortly after the spinneret bottom of the thread speed so that the The thread is carried along by the precipitating liquid, as it were.

With these measures you can use higher spinning speeds at the nozzle, even at the

109 577/328

Spinning λόπ spinning solutions that are difficult to precipitate or when using spinning baths with a low precipitation force. Furthermore, this results in less breakage of the capillary threads, while the freshly spun thread ends up in order to obtain higher strength can stretch better.

An advantageous embodiment of the invention, in which the tube with the trumpet-like extension is fixed in the wall of the open spinning bath tub below its liquid level, is characterized by that the wall of the trough serves as a second guide surface.

This construction enables the spinneret with guide bodies, dope feed lines, etc. easy to pull out of the spinning bath tub.

There are draw-off channels for viscose threads of 500 den Well proven for threads and precipitating liquid with a clear width of 9 mm, while for threads of 1500 which the clear width was 16 mm.

The distance between the guide surfaces at different distances from the nozzle center is particular depends on the clear width of the canal. This is generally and at least the closest Place only a few millimeters and is adjusted so that the speed of the precipitating liquid between the guide surfaces and into the channel increases relatively quickly.

Operating states have proven themselves in which the ratio of the speed of the precipitating liquid on the outer edge of the guide body surrounding the spinneret to the velocity of the liquid is above 1: 3 in the channel.

The device according to the invention can in principle be used in all wet spinning processes will.

It is suitable for the production of rayon threads with a low titer as well as of Threads with a high titer, e.g. B. 500 to 1500 den and more, which are suitable for use as a car tire cord are.

The invention is explained in more detail below with reference to the drawing.

Fig. 1 shows a longitudinal section of an embodiment of the device according to the invention;

Fig. 2 shows a longitudinal section of a second embodiment.

In Fig. 1, a viscose supply line 1 is sealed by a screw 2 on a middle piece 3, wherein the middle piece 3 is provided with a through hole 4 through which the viscose to a spinneret 5 flows. The spinneret 5 has a base 6. Opposite the base 6 is a tubular one Channel 7.

The precipitating liquid flows through a feed pipe 8 into an enlarged, annular distribution space 9 and then passes, after having passed an annular steel wire screen 10, into an annular space 11 and from there between two guide surfaces 12 and 13 and then flows along the spinneret base 6 into the tubular channel 7.

The guide surface 12 forms part of a guide body 14 in which the spinneret 5 is enclosed. the The guide surface 12 merges flush with the spinneret base 6.

The guide surface 13 is formed by a trumpet-like widening of the channel 7 and the narrowed part a hood 15 is formed.

At the various points to be sealed, annular seals 16 to 20, preferably made of Rubber, arranged. Annular spacers 21 are provided with which the distance between the Guide surfaces 12 and 13 can be changed.

In Fig. 1, the supply line for the spinning liquid, the supply line for the precipitating liquid, the discharge for the precipitating liquid and the discharge for the precipitating liquid combined with the thread to form a whole.

In Fig. 2 the spinneret is independent of the precipitation liquid feed line and the tubular channel for the precipitation liquid discharge is attached to the container for the precipitation liquid.

In Fig. 2 are the viscose feed line 1, the screw piece 2, the middle piece 3 and the spinneret 5 combined in the same way as in FIG.

The whole is arranged in a spinning bath trough 22, so that the entire spinning device is in the precipitating liquid is submerged.

The tubular channel 7 forms part of the spinning bath tub 22, and the guide surface 13 is again formed by the trumpet-like widening of the channel 7.

The guide surface 13 merges flush into a wall 23 of the spinning bath box 22 opposite the spinneret 5 and the guide body 14, the surface 12 of which forms the opposite guide surface. The precipitation liquid flows between the two guide surfaces 12 and 13 to the channel 7 in the same way as in FIG. 1.

The center piece 3 with the associated parts of the spinning device is adjustable in the spinning bath trough 22 arranged. This can be done in any known manner, e.g. B. by arrangement on a slide, take place. In this way, the distance between the guide surfaces 12 and 13 can be regulated as desired.

Claims (2)

Patent claims: 1. Apparatus for the production of artificial threads by the wet spinning process, in which a spinneret with a flat spinneret base and lines for supplying the spinning bath liquid are provided in the space in front of the spinneret bottom of its entire circumference, and in the a guide body surrounding the spinneret and lying in one plane with the spinneret base and a tube coaxial with the spinneret, whose end facing the spinneret base is widened like a trumpet, two guide surfaces form for the spinning bath liquid, characterized in that the short distance from each other lying guide surfaces (12, 13) a flat disc-shaped guide path perpendicular to Form the center line of the spinneret. 2. Apparatus according to claim 1, wherein the tube with the trumpet-like extension in the Wall of the open spinning bath tub is attached below the liquid level, characterized in that, that the wall (23) of the trough serves as a second guide surface. Considered publications:
German Patent Nos. 516 571, 929 692;
British Patent No. 394,049;
U.S. Patent No. 2,510,135. 1 sheet of drawings