DD213699A1 - RECTANGULAR PANEL FOR MELT SPIN PROCESS - Google Patents

Abstract

The invention relates to a Rechteckduesenplatte for melt-spinning process of synthetic fibers in the case of lateral cross-supleaving and a high number of elementary filaments per unit area. The aim and task is to make a comparable arrangement of holes on the Duesenplatte the Abkuehlung of spun Einzelfaeden to equalize and increase the titers Gleichmaessigkeit. According to the invention, this is achieved by dividing an angle a = 7.5 degrees formed by a side edge of the nozzle plate and the straight lines connecting the centers of the bores in the transverse direction to the nozzle plate for a hole and row spacing of 4 mm, and this angle per mm shortening of the bore and Row spacing increases by 0.9-1.6 degrees.

Description

Title of the invention

Rectangular nozzle plate for melt spinning process

Application of the invention

The invention relates to a nozzle plate of rectangular design, which is used in melt-spinning process, preferably for I-polyester and tolyamide.

Characteristic of the known technical solutions

Purely the spinning of synthetic fibers by the melt spinning process both round and predominantly rectangular nozzle plates are used and the molten individual filaments are cooled immediately after their exit from the nozzles to achieve the later Pasereigenschaften or for the purpose of Padenbildung mostly by a unilateral Queranblasung. Different bore arrangements are known. According to DE-OS 1 435 742, the spinneret plate has an array of holes in several parallel rows, each row has 70 to 100 holes each with equal distances »A bore assembly at the intersections of juxtaposed isosceles or equilateral triangles when spinning with unilateral Queranblasung and with hole spacings greater than 7 mm, preferably 10 mm, WP 140 400 was proposed. The nozzles are subject to a hole distribution of a> 1.5 x x, where a »means the distance between holes one behind the other and χ» the distance between holes.

Perner is described in WP 143 434 a rectangular nozzle plate in which the number of nozzle holes per row from the blowing side to the side opposite to the blowing side steadily decreases and thus increases the hole spacing in the rows steadily. The number of rows will ever

18.FEB1983 * G7O22 ,:

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calculated according to the total number of holes as with a normal distribution. According to JP - PS 903/69 again a parallelogram - like bore arrangement is proposed, whereby with adjacent rows in the direction of blowing no nozzle bungs are arranged directly behind one another. It is disadvantageous when using such nozzle plates, especially with a large number of holes per plate and a high hole density, that inevitably the application of the usual Queranblasung leads to more or less different cooling ratios of the monofilaments and uneven thread tensions. Lifting the resulting increased tendency to thread interruptions, z. B. in case of weaknesses due to improper conditions in the melt u. Ä., Which again cause sticking of individual threads or their detachment from the thread bandage, there is an altered pre-orientation of individual or groups of monofilaments. In addition, the titer uniformity may deteriorate considerably.

Object of the invention

The aim of the invention is to provide a nozzle plate, which allows a homogenization of the cooling of spun filaments and thus an improvement of the spinning and later stretching process and an increase in titer uniformity.

Explanation of the essence of the invention

The invention is based on the object by, a defined arrangement of holes on a rectangular nozzle plate for a one-sided Queranblasung increase the titer uniformity

 The solution according to the invention is characterized in that

for even bore distribution over the rows of holes arranged parallel to the longitudinal edge of the nozzle plate, the distance between the holes in the row is equal to the row spacing and for a bore · and row spacing of fm that connects from one side edge of the nozzle plate and the centers of the holes in the transverse direction to the nozzle plate Straight line formed Schnitts angle cL = 7.5 ° or the possible second from a side edge of the nozzle plate and also the centers of the bores in the transverse direction to the nozzle plate connecting straight line formed intersection angle β results from the relationship tan / 3 «1 - tan et . Based on this reference base, the intersection angle ⁰ ^ increases with a shortening of the bore and Reihenab3tände to <4 mm per mm shortening by 0.6 1.6, preferably by 1.0.

Thus, an exactly matched to the bore spacing blowing of the individual threads is achieved. In this way, even with rectangular nozzle plates with high spin hole density and one-sided transverse blowing a largely uniform ambient temperature with respect to the monofilaments and constant cooling conditions is achieved while improving smoothness.

embodiments

Example 1 (comparative example)

A rectangular-shaped nozzle plate with isosceles triangular holes was used for the spinning of polyester threads of final fineness of 0.16 tex. The number of holes was 1100 holes per nozzle plate and with a hole spacing of 3j93 mm. The other spinning conditions relative to an 18-position spinning line were:

Effective area nozzle plate: 265 mm χ 65 mm

Hole diameter: 0.3 nm

Flow rate: 680 g / min and position

Annealing: 0.5 m / s

Lifting speed: 1150 m / min

Intrinsic viscosity: 0.65

Degree of finishing: 1: 3> 6O

As a result of yarn production, the following values were achieved:

Titre uniformity: 8.7 %

Thread running rest: unstable, sticking

Spinning defects of ground wire per 2 mins 25 winding formations in stretched j

based on garbage size of 16.4 ts 35

Example 2

Under analogous conditions to Example 1, a rectangular nozzle plate was used for one-sided Queranblasung whose bore spacing 3 of evenly arranged over the parallel to the longitudinal edge of the nozzle plate rows of holes and their distance 4 between the rows of holes itself 3.93 mm. The cutting angle formed from a side edge 2 of the nozzle plate and the straight lines connecting the center points of the bores in the direction transverse to the nozzle plate was chosen to be 7 7 _$ (j> ^0. The possible second cutting angle necessarily resulted from this

/ 3 '"40,9 °. ί

The following results were achieved:

Titre uniformity:; 5.3 % thread running rest: stable

Spinning error total cable per 2 min: <3 winding formation in stretch,: based on batch size of 16.4 ^ ¹ &

- 5 «.

- 5 - Example 3

In contrast to Example 2, nozzle plates with 1300 bores were used, the withdrawal rate being 960 m / min and the degree of stretching being 1: 3 »95. The hole spacing 3 across the rows and the row spacing 4 were changed to 3.53 ram. The cutting angle oc was 8.1 ° and for the. Schnittviinkel & resulted from it 40.6 °. With this hole arrangement, the following results were achieved:

Titre uniformity: 5.4 %

Padenlaufruhe: stable

Spinning error Total cable per 2 min: 5: 3 thickness in stretch, based on batch size of 16.4 t: 4

Claims (2)

Claim for service : 1. Rectangular nozzle plate for melt-spinning process of synthetic fibers with one-sided Queranblasung and high number of filaments per unit area with parallel to the longitudinal edge (1) of the nozzle plate arranged rows of holes, with a uniform bore distribution over the rows of the distance (3) of the holes in the row equal to the row spacing ( 4), characterized in that for a hole and row spacing of 4 mm from a side edge (2) of the nozzle plate and the center of the holes in the transverse direction to the nozzle plate connecting straight line (5) formed Schnittrinke! eL - 7> 5 ° and this increases to a reduction of the bore and row spacing to <4 mm. 2. nozzle plate according to item 1, characterized in that per mm ^: shortening of the bore »and ReihenabStandes the cutting angle oL by 0.6 - 1.6 °, preferably by 1.0 °, increases. For this 1 page