DD217543A1 - SIMILAR PRODUCTION METHOD OF GROBER, PROFILED SYNTHESIS FEDERIES BASED ON POLYAMIDE - Google Patents

Abstract

The invention relates to a simplified production process of coarse, profiled polyamide-based synthetic fibers using the melt-spinning process. The aim and the task are to obtain both a good cooling process and a good profile expression without the use of complicated blowing systems, using the Laktamrauchabsaugung. According to the invention, this is achieved if the extracted air quantities are subject to the defined mathematical relationships Amin N lg M m / n (m 3 / h spinning station) Amax 3.5 N lg M m / n (m 3 / h spinning station).

Description

- 1 title of the invention . ·; <'

Simplified production process of coarse, profiled synthetic threads based on polyamide.

Field of application of the invention

The invention relates to a method for the simplified production of coarse, profiled synthetic threads based on polyamide using the melt spinning method.

Characteristic of the known technical solutions ,

It is well-known that threads are used in the production of synthetic fibers. after the melt spinning process after the exit of the polymer melt from the die capillaries, they are subjected to a rapid cooling and for the purpose of rapid solidification and during the. spinning of profile threads for the expression, a sufficient profile shape. The cooling takes place in such a way that gas streams are blown through the bundles of filaments predominantly transversely to the yarn path via correspondingly shaped blowing systems. Furthermore, during the spinning of polyamide filaments immediately below the spinneret, the lactam vapors forming are removed so as to avoid crusting of the spinning nozzle surface by vercrackende Laktamablagerungen, thus enabling a stable spinning process for '^ * for the rapid cooling process, the thread and at the _profile: spiders, in particular for expression of the desired profile of the threads are various methods and devices, known, which are respectively adapted to the spinning systems via differently shaped AnblasluftZuführungen and guarantee a ¹ ^ eitestgehende laminar air flow across the thread bundle.

All methods and devices described in the literature, such as. 3. in the patents DE-AS 1303038, CH - PS 467348, DE - OS 1785490, DE - OS 2923700,

Although DE-05 2906618, GB-PS 1144238, DD-WP 110312 permit rapid cooling and expression of the profile shape of the threads given in accordance with the nozzle bores, they are, however, very cost-intensive and require constant maintenance. , ,

Other methods, which also require a Queranblasung, but to obtain the desired profile shape without estreine. Cooling work, according to the principle of the addition of certain surface-active agents. In DD - PS 154784 z. For example, it is proposed to add surfactant-containing agents before the polymer melt is blown, which then should enable a good profile shape of the filaments. , Such methods have the same abovementioned meaning with regard to additional expenses for the corresponding agents. , , .

Aim of ^: invention; '

The aim of the invention is to get along without the use of complicated Anblassysteme in the spinning coarse, profiled synthetic threads based on polyamide.

Explanation of the essence of the invention

The invention is based on the Aufgäbe, the cooling process' and thus the expression of the corresponding profile shapes by the in the melt spinning of polyamide threads. to achieve required lactam intake. According to the invention, the object is achieved in that according to the throughputs per spinning position, the capillary number der'einzelnen nozzle plates as well as the throughput capillary per well defined amounts of air are sucked. '

Surprisingly, it was found "that when spinning coarse, profiled synthetic threads based on polyamide with the use of spinneret plates with a maximum

Capillary number of 100 and using a Laktamrauchabsaugung without the use of complicated Anblassysteme to good expression of the corresponding profile shape of the filaments comes, vjenn the extracted by Laktamrauchabsaugung air quantities subject to the following mathematical relationships:

A = IT. Ig M - m / n (m ³ / h spinning station)

3.5 ♦ H "♦ Ig M + m / n (m / h ♦ spinning station)

A. .. a min. extracted air volume per spinning position = maximum. Extracted air volume per spinning position

H = capillary number / spinning position '

M = throughput / spinning position (g / min) m / n = throughput / capillary bore (g / min)

In < \, ± _n the form of the profile is inadequate, whereas> A results in an unstable spinning process.

embodiment

To obtain an i, 7 tes polyamide fiber trilobalen cross-section, a polyamide melt viscosity of 2.40 was directly spun at a temperature of 265 ⁰ C, There were spinnerets with 28 Kapillarbohrungen corresponding. Profile shape for use «· The throughput per spinning position was 97 g / min. 120 nrVh'Air was sucked off via the Laktamrauchabsaugung. The threads were not subjected to any additional transverse blowing. The spinning process was very stable. There were no interruptions in the yarn, the profiles were equally pronounced on all yarns and the spinning material could be further processed without difficulty. "_ ._

Claims (1)

Brfindungsanspruch Simplified Herstellungsaverfahren coarse, profiled synthetic threads based on polyamide when using spinnerets with a capillary number of up to 100 and using a Laktamrauchabsaugung, characterized in that the extracted air quantities the mathematical relationships · ' ^A min ~ ^Έ ' ^{lg M} " ¹ ^ ¹¹ ^ ^m3 / ^h · spinning station) A "_. a 3,5. $ · Lg M + m / n (m ^ / h spinning station), where ' A_. , _ Minimum extracted air volume per spinning position A "__ β Maximum extracted air quantity per sninned position U a Capillary number / spinning position M a throughput / spinning position (g / min) m / n = throughput / capillary bore (g / min) mean.