CS542790A3 - Spinning nozzle - Google Patents

Abstract

In a spinneret, the spinning plate having the spinning capillaries (9) consists, according to the invention, of a carrier plate (2) having holes (7), especially stepped bores, into which are inserted or pressed small plates (8) containing the capillaries (9). The carrier plate (2) can therefore be of any thickness and consist of material of any strength, in order to achieve a high pressure resistance, without making it difficult to produce closely arranged capillaries (9), since the capillaries can be made in the softer small plates (8). <IMAGE>

Description

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinneret and a nozzle head, which preferably heats channels to and has a spinning plate. with capillaries.

The spinneret nozzles are required for the production of fibers, the starting material for the spinning material 3a based on an organic or inorganic material. Liquid or speckled material, which most often has a very high viscosity. it is extruded by differently shaped nozzle capillaries, and then, in accordance with the process carried out, strengthened to the fiber by spinning steps or post-processing.

Qd good spinning nozzles see the quality characteristics such as drilling quality / dimensional accuracy, smoothness, bore walls, sharpness, bore outlet edges, smoothness, corrosion resistance, and specially formed spinning channels. As not the last one, the need for strength, spinning nozzles is recalled, since the spinneret is subjected to an enormous pressure load.

Especially in the spinning of the highly viscous spinning material base of eelusic solutions it is necessary to use spinning nozzles or materials for spinning nozzles with high rigidity, since spinning pressures up to 20 [mu] Pa are possible.

These problems are particularly topical in the case of cellulose - 3 -

solutions prepared by the NMSIO method. For example, this method is known from the examples of the patent application; BOS ^ Number 29 13 589. NMMO; is N-methylmorpholine N-oxide, a tertiary amine N-oxide which acts as a solvent for cellulose. Due to the high spinning viscosities, spinning nozzles with reinforced spinning plates must be used.

On the other hand, there is an effort to increase density; Capillaries of Fibrous Nozzles to Increase Performance per Unit Area of Spinning Place »However, the problem is that fibers tend to stick together»

However, in order to increase capillary density, it must; reduce fiber stickiness. This is possible by; to the surface. freshly extruded fiber; apply a liquid which does not dissolve the fiber to reduce the effectiveness of the solvent (via German patent application DAS No. 28 44 163). The polyalkylene ether tertiary amine oxide, particularly polyethylene glycol (see German Patent Specification No. 21121) can be added.

Therefore, there is a need for a spinneret and a relatively large diameter, and with a high capillary density, with such a high number of capillaries, the cellulosic solution could be economically spun at the same time.

Known spinning nozzles have a partially high density of capillaries, but do not give off high spinning pressures »

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The spinning nozzles arch out of it are delayed. Spinning nozzles are used for such viscose powders. Such spinning nozzles: are used for the dry, spinning of plastic melts. However, these nozzles have the drawback that due to the complicated formation of nozzle holes in the nozzle plate for each individual spinning capillary; pre-drilling in relative hardness is required; however, solid material to make. then they could apply capillaries with fine, diameter ·. For larger diameter bores; a small number of spun capillaries in the nozzle plate is possible, thereby resulting in a small number of spun capillaries. low density: capillaries. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a spinneret that resists high spinning pressure on the one hand and a high capillary / capillary density (mm) on the other.

This object is achieved by the spinning nozzle according to the invention such that the spinning plate consists of a stable support plate, which are openings and in which holes or plates are inserted in which the capillaries are formed. tens of material of lesser grip than steel, in particular of noble metal. At present, gold, silver and tental are preferred.

Thus, according to the invention, a support plate is used, the thickness of which is sufficiently dimensioned to withstand high sputtering pressures. there are no spinning capillaries on each other; the plates are inserted or pressed into the plates; An example of a noble metal plate Z in which, depending on the softness of the metal, the required number of fiber capillaries without pre-bores is advantageously formed. the plate having a graduated diameter, wherein the graduation is near the exit flat plate and the smallest diameter is on the outer surface of the carrier. This is; the inserted or molded plate is additionally held and can withstand very high spinning presses.

Finally, it is advantageous if there is an aperture plate on the inner side of the carrier plate and a filter is arranged between the carrier plate and the aperture plate. The apertures in the aperture plate are in such a manner that the arrangement of the plates is such that the cellulose solution or the polymer melt is expediently distributed.

In such a case, the filters retain particles of dirt or undissolved polymer fragments *

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the accompanying drawings, which are not to be construed as limiting the invention. t í

Fig. 1 shows a spinneret according to the invention in section ·

2, the spinneret carrier plate according to FIG. 1 is somewhat enlarged, in part, in comparison with FIG.

FIG. 3 shows the plate for insertion into the support plate according to FIGS. cut. The nozzle head χ in FIG. 1 is expediently made of stainless steel. It has heating channels of tempering and forms the upper part of the spinneret into which the cellulosic solution is supplied and during the spinning it is permanently tempered.

In: the nozzle head V is a plate with holes and the filter 8 is a plate 2. The three elements are a threaded nut printed on the nozzle head. A soft seal may be used to seal.

Support Plate / FIG. 2 / has read holes made with graded diameter yarns. In FIG. 2, only one of these openings is shown for simplicity. Plates 8 (see FIG. 3) of relatively soft material are pressed into these openings. In such a soft material; many capillaries £ can be created relatively close to the seed. In Figure 3, only one core of capillary 9 is shown in simplicity

The aperture plate J is arranged exactly like the apertures of the loading plate 2 and a filter 4 is arranged therebetween. . Advantageously, a corrosion resistant metal sheet is used. The spinning mass is divided; In the spinning nozzle according to the invention, a high capillary density can be achieved at a high - 7 - pressure resistance. The lacquer is, for example, a. a spinneret can be produced having a diameter of 1147 capillaries, corresponding to 0.72 / mm, and withstanding an operating pressure of approximately 8.5 MPa. Another spinneret has a capillary of 1.19 / mm and is designed for an operating pressure of 5t5 MPa ·

Elementary design of the nozzle assembly allows the exchange of individual support plates with platelets of noble metals in which the capillaries are of different diameter, length and cross-section. and

Claims (7)

- 8 - PA T E NT OVA R OK Y i ___ _ _ _ - 1. A spinning nozzle with a nozzle, preferably a heating plate and a spinning plate and capillaries, characterized in that the spinning plate consists of a stable support plate (2) in which the openings (7) are provided with openings (7). inserts (8) are inserted or pressed in which the capillaries (9) are formed. 2 · Spinning nozzle according to item 1, characterized by a bearing plate / 2 / j® for stainless steel, 3. A spinneret according to claim 1 or 2, characterized in that the inserts (8) are made of a material of lesser hardness than the hardener, and in particular are of noble metal. 4. A spinneret as claimed in claim 3, characterized in that the fingers (8) are made of gold or silver. 5. The spinning nozzle according to claim 3, characterized in that the pads (8) are of tantalum. 6. A spinneret according to claim 1, wherein the holes in the support plate are provided as bores with a graduated diameter, said step being at the outlet side of the support plate and the outlet of the support plate. . | i the smallest diameter ge at vy- <O cn o> -xl o "J (7 · The spinneret according to items 1 to 6, marked on the inside of the support plate (2) is a plate with holes and a filter is arranged between the support plate (2) and the hole plate.