CS266257B1 - A method of preparing fine and superfine fiber polypropylene fibers - Google Patents

Abstract

Fine and superfine polypropylene new fibers with unit length fineness in the range from 0.5 to 2.0 dtex are prepared from isotactic polypropylene melt, in which the polymer melt remains in the spinning block for at least 2 minutes.

Description

2 CS 266 257 B1

The present invention provides a method for preparing fine and superfibrous polypropylene fibers, e.g. j. with a fineness of up to 2,0 dtex manufactured from isotactic polypropylene. The preparation of fine and superfine fiber polypropylene fibers, which express the single fineness, ranges from 1.0 to 2.0 dtex, respectively. up to 1.0 dtex of superfine fiber on commonly manufactured machinery is very difficult or impossible for a large failure rate in the spinning process itself. In the process of forming the melt polypropylene fibers in blocks k 3, the polymer melt remains below 2 minutes, adversely defects in the spout from the nozzle that cause breakage of the take-up galets of the winding machine. Said negative effect has an increasing tendency to decrease the melt retention in the spinning block.

This problem is solved by the present invention according to which the polymer melt remains in the spinning block for at least 2 minutes. The desired effect can be achieved either by the boiling space in the spinning block through which the polymer melt passes, while retaining the spinning capacity, or at the current spinning blocks by increasing their number and thereby slowing the melt flow.

The fine and superfine fiber polypropylene fibers prepared in this way exhibit good processability in both spinning and other manufacturing processes. The fine and superfine fiber polypropylene fibers are widely used in the textile sector for the preparation of integrated knitted fabrics, where, together with cotton, they form a substitutable component.

The present invention and its effects are documented in the following examples. Přikladl

110/66 dtex fine fibrous polypropylene fibers were prepared. j. of an isotactic polymer melt size of 1.7 dtex using spinning blocks in which the polymer melt was 62 sec.

Under these conditions, there were so many thread breakages on the take-off galets of the winding machine that their production was impossible, the fiber could not be wound. Example 2

110/66 dtex fine-fiber polypropylene fibers were prepared using the same spinning blocks as in Example 1, but pooled from a pair of blocks for nominal length fineness, thereby extending the melt residence time in the individual spinning block from 62 seconds to over 2 minutes. *

Under the aforementioned spinning conditions, the smooth run, the negative rupture effect of the filaments on the exhaust galets were removed and the spinning processability was required.

Number of breaks 5 / ton of undrawn fiber. Example 3

Fine-filament polypropylene fibers having a fineness of 110/66 dtex from the melt of isotactic polypropylene were prepared using spinning blocks with a polymer melt residence time of 3 minutes and 50 seconds.

Under the above conditions, the preparation process was at a comparable level to that described in Example 2. The number of 4 / ton breaks of unbound fiber.

Claims (1)

EXAMPLE 4 Superfine fiber polypropylene fibers having a fineness of 56/66 dtex of isotactic polymer were prepared using a spinning block with polymer melt in block of 10 minutes. Under the above conditions, their preparation was at the level shown in Examples 2 and 3. The number of breaks of 4 / ton of unbound fiber. DISCLOSURE OF THE INVENTION A method for preparing fine and superfine polypropylene fibers of a single length fineness ranging from 0.5 to 2.0 dtex from isotactic polypropylene, wherein the polymer melt remains in the spinning block for at least 2 minutes prior to spinning. and*