DE1660621A1 - Novel spinnerets and special threads obtained with them - Google Patents

Description

Novel »Spinneret and special threads obtained with it,

The invention relates to a spinneret, the nozzle holes of which have a special one Possess shape, and threads with a special cross-section that help with spun in this nozzle.

It is already known in the textile industry. To use spinnerets, whose nozzle holes have a wide variety of shapes, e.g. triangular, square, rectangular or arched forms for the production of threads whose cross-sections are special, from the usual round or substantial round shape of most artificial or synthetic threads have a different shape. These threads can, for example, have cross-sections in the shape of a clover leaf, in the form of a Y, X, H or C, or else flat or be hollow.

A spinneret has now been found, and that forms the subject of this invention, the nozzle hole shape of which is derived from a central equilateral triangle, with the three distinctly square parts are connected} the shape is determined by a circle of diameter D, from which one excludes three triangles each with a curved side} these triangles are symmetrical to the center of the circle with the Diameter D and offset from one another by 120 and are limited!

1.) through an arc of diameter Df 2.) by two tangents to at least one with

the circle from Durohmesser D concentric circle with the diameter d, which is so large that

'£ is

109632/1261

wherein the tangents with each other form an angle oe between 60 ° and 100 °, and the circle or circles with the diameter d lie outside the angle © C.

The invention also relates to cellulose ester threads, their cross-section forms the shape of three triangles, each vertex of these triangles being connected to the three vertices of a fourth apparently equilateral triangle is, in which "each side is connected clearly parallel to one of the sides of each of the first three triangles, in such a way that the whole is one strong, distinctly triangular shape.

The invention also includes a method of making threads from cellulose ester according to the invention by eating a cellulose ester solution through the spinneret according to the invention into a dry spinning cell traversed by an evaporative atmosphere, the walls of which have a temperature from 80 ° to 130 °.

The cellulose esters which can be used in the process according to the invention are the esters of lower fatty acids, especially so-called secondary cellulose acetate or cellulose triacetate «

Finally, the invention relates to synthetic polymers by " Melt spinning and strong cooling “obtained threads that have a three-legged Have Fora, which is the result of the nozzle spinning holes of the Bohrungsfora according to the invention. The angles at the outer ends of the legs are rounded compared to the corresponding legs of the corresponding nozzle bore.

The threads of synthetic Folymeren according to the invention can be made of any polymer spinnable by the melt spinning process can be obtained, on condition that the spun filaments are always strongly cooled.

The spinneret can be used in any known dry or melt spinning device be applied.

The spinneret can have any shape and any desired dimensions and aue Any material are made up for spinning the desired fabric

109832/1261

suitable is. For example, it can be in the form of a plate or cup. You can be provided with nozzle holes in one or more Circles or arranged in one or more rows.

For the production of cellulose ester threads according to the invention, the temperature must the spin cell walls can be chosen between Θ0 and 130, depending according to the volatility of the solvent used and the length of time the threads stay in the cell, i.e. depending on the spinning speed and the cell length.

They give special cross-sectional shapes of the threads according to the invention they have special characteristics, especially a great ability to relax this property is particularly valued and sought after for carpet yarns and other uses that require a very bulky fiber. These special cross-sectional shapes can also be used for the production be interesting for articles of special appearance.

The attached drawings illustrate the invention.

Figure 1 shows a nozzle bore according to the invention. Figure 2 shows a strong enlargement of the cross section through a cellulose ester thread, consisting of several individual fibers, according to the invention. FIG. 3 shows a greatly enlarged cross section through one of thread consisting of several individual fibers aas a synthetic polymer

In the following illustrative examples, the Quantities and percentages on weights.

1) A 27.5% acetone solution of cellulose acetate is prepared. This solution is spun in a vertical spin cell with at I3O ⁰ heated walls 9 through a spinneret having circular openings arranged according to FIG. 1

109837/1261

Each nozzle hole has the following dimensions »

Β - 0.18 mm

d - 0.04 a * (| D)

PC- 72 °

They evaporation · atmosphere from the tree air moves τοη above down ^ according to the grain of the grain.

At the end of the cell one winds at a speed τοη 250 m / min, a thread of 150 denier (I67 decitex), 9 monofilaments, the cross-section of which is shown in Figure 2

Several threads of the same kind can be combined into a saber, that for the production of τοη cigarette filters or τοη carpets is suitable, or can be cut to produce τοη staple fibers.

2) Prepare a solution consisting of 22 parts of cellulose triacetate 11 files methanol 67 parts of methylene chloride

This solution is spun through 9 nozzle holes τοη in Figure 1 specified shape with the same dimensions as in Example 1 in a dry spinning cell, the walls of which are heated to 85 °. Di · air one lets τοη circulate up and down in the spinning cell and at a speed τοη 200 m / min, a thread τοη 155 denier is obtained (150 decitex), 9 single fibers

The thread obtained has a cross section as shown in FIG. Ir is very toluminous and can be used to make very bulky items. As in example 1, you can combine several identical threads to produce τοη cables.

109837/1261

3) One puts a solution τοη 27.5 # secondary cellulose acetate in Acetone made

This solution is spun through a spinneret with 5 nozzle holes same as those in Example 1 and in the same dry spinning cell, the walls of which, however, are heated to 115 °.

The evaporation atmosphere, which consists of tree air, runs τοη top to bottom, in the same sense as the thread.

A thread is obtained at a speed τοη 200 m / min * τοη 100 denier (111 decitez), 5 individual fibers that make up the cross-section according to Figure 2 show. The thread has a voluminous appearance.

4) The same solution as in Example 3 is through a spinneret with 36 spinning holes similar to those of Example 1, but one Aspect ratio τοη i / 4, in a spinning cell as in Example 1 spun. However, the walls are heated to 120 °, the evaporation atmosphere runs clay up and down.

A thread is obtained at a speed of 300 m / min τοη 200 denier (222 decitex), 36 individual fibers, which have a cross section similar to that in FIG. The thread is toluminous and has good recreational ability.

5) A polyhexamethylene adipamide with a relative viscosity of

35, measured at 25 ° in a solution of 8.4 jd in formic acid

, ο

of 90 Jb, is at a temperature of 292 under a pressure of 14 kg / cm in a nitrogen atmosphere through a nozzle with 180 Spun nozzle holes in the form of Figure 1. Each nozzle hole has the following dimensions 1 D - 0.54 mm d - 0.11 mm (# |) ex- 72 °

The threads are in a speed of 40 m / min Bath spun with cold water 6 cm below the spinneret. They are stretched three times when cold

109837/1261 _ ₆ _

ORIGINAL INSPECTED

A 3120 denier (3470 decitex) thread is obtained with each the 10 individual fibers has the shape shown in FIG.

Example 5 describes the production of polyamide threads. By a technician can easily make a transfer to other synthetic polymers.

Claims (3)

Claims ι 1.) Spinneret, characterized in that the shape of the spinning holes Ton is derived from a central equilateral triangle, to which three clearly four-sided approaches are connected, whereby the shape the spinning holes is bounded by a circle with the diameter D, from which one excludes three triangles with a curved side, which are symmetrical to the center of the circle with the diameter D and to each other at an angle of 120 °, and which are limited by an arc of diameter D and by two tangents to at least one with the circle of diameter D. concentric circle with the diameter d, which is so large that - = r, where the tangents with one another form an angle O < between 60 ° and 100 °; and the circle or circles of diameter d lie outside the angle Of. 2.) Process for the production of cellulose ester threads with the help of Nozzle according to claim 1 in the dry spinning process, characterized in that the walls of the spinning cell through which an evaporation atmosphere passes have a temperature between 80 ° and 13Ο. 3.) Process for the production of threads from synthetic polymers of three-legged shape with the aid of the nozzle according to claim 1, characterized in that the spun in the melt spinning process Threads are strongly cooled immediately after spinning. 109837/1261 Blank page