SU937547A1 - Apparatus for cooling polyamide filaments being formed - Google Patents

Description

(B) DEVICE FOR COOLING OF FORMUMABLE POLYAMIDE THREADS

one

The invention relates to the field of chemical fibers, namely to devices for cooling filaments formed from a polymer melt.

A device is known for cooling the melttable filaments of a polymer consisting of a molding block having a well with a blasting shaft and a heat chamber HP.

A disadvantage of this device is the uneven temperature field inside the heat chamber, which reduces the quality of the yarns produced.

The purpose of the invention is to improve the quality of the threads.

This goal is achieved by the fact that in a device containing a molding unit having a well and a blower shaft and a heat chamber, the upper part of the heat chamber is located in the well of the molding block, and the lower part in the blower shaft.

In addition, the heat chamber is made in the form of telescopically connected cylindrical elements. In this case, the output section of the lower element has the shape of an ellipse.

FIG. 1 shows the device in section, front view; on fmg. 2 - that. same, side view. .

In the device in the well molding block 1 Sfig. 1 and 2), having channels 2 for the upper suction, under the die 3 is installed a heat chamber consisting of telescopically articulated cylindrical links, upper and 13 lower 5, at the bottom of which there is a projection as part of a conical surface coaxially aligned with the cylindrical surface of the link.

Upper part of the chamber (Fig. 1 and 2)

20 is placed in the well of the molding block 1, and the bottom is in the blower shaft 6. The te chamber is designed to move vertically i

guide 7 with the help of supports 8 (Fig. 1) mounted on the links of the heat chamber. The bundle of formable filaments 9 (Figs. 1 and 2) is located inside the links and 5 of the heat chamber and the blasting shaft 6.

A device for cooling the polyamide threads works as follows.

Molten polymer pushed through the holes of the die 3 (Figs. 1 and 2) enters the heat chamber in the form of liquid jets, the upper part of which is in the well of the molding block 1, and the lower part in the blower shaft 6. After the die, the temperature of the streams decreases and they solidify. solid yarns, the quality of which depends on the conditions of hardening of the polymer.

Upon exiting the heat chamber, intensive cooling of the filament bundle 9 with transverse-blowing air, shown in FIG. 2 arrows. The bundle of threads 9 deviating from the vertical does not touch the wall of the lower element of the heat chamber, since its output section has the shape of an ellipse.

Since the heat chamber sets the conditions for pressing the formable threads, the relationship between the height of the heat chamber and the viscosity of the polymer is determined. This relationship for polyamide yarns is represented by

Ig h 0.83-,

where h is the height of the heat chamber; - relative polymer viscosity.

In order to adjust the height of the camera, it is made of telescopic articulated links.

 and S. This allows high quality filaments to be obtained in a wide range of relative polymer viscosities.

The diameter of the heat chamber is smaller than the diameter of the well of the molding unit 1, which allows low molecular weight compounds released during the formation of the filaments to be removed by the upper suction (shown by arrows) through channels 2 without cooling the air inside the chamber.

The proposed device allows to improve the quality of formable yarns. The device is structurally simple, does not require additional heating, is convenient to maintain, allows you to easily manage the process of forming filaments.

Claims (2)

1. A device for cooling molded polyamide filaments, comprising a molding unit having a well and a blowing shaft, and a heat chamber, characterized in that, in order to improve the quality of the yarns, the upper part of the heat chamber is located in the well of the molding block, and the lower part of the blowing unit. 2. The device according to claim 1, of which is that the heat chamber is made in the form of telescopically articulated cylindrical elements, the output section of the lower element having the shape of an ellipse. Sources of information, admitted 5p attention in the examination 1. USSR author's certificate W, cl. D 01 D 4/00, 1972.