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Method for preparing double-component monofilament compositely formed under spinning box

A technology of spinning box and compound forming, which is applied in the direction of conjugated synthetic polymer artificial filament, filament/thread forming, and melting of filament raw materials, which can solve the problem of affecting the spinning quality and the spinning process temperature cannot be reached Optimum and other issues to achieve the effect of improving spinning quality

Active Publication Date: 2020-12-22
WUXI JINTONG CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When entering different polymer melts into the same spinning box for compounding, the temperature of the box is generally set according to the polymer with a high melting point, which leads to the fact that the spinning process temperature of the polymer with a low melting point cannot be optimal and cannot meet the spinning requirements. The rheology of the polymer required by the process directly affects the spinning quality

Method used

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  • Method for preparing double-component monofilament compositely formed under spinning box
  • Method for preparing double-component monofilament compositely formed under spinning box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the prior art, usually, the composite spinning is completed in the composite spinning assembly of the spinning box. The bicomponent melt that makes up bicomponent monofilaments is composed of two different polymers. The melting points of the two polymers are different, so the corresponding optimum spinning process temperature is also different. When entering different polymer melts into the same spinning box for compounding, the temperature of the box is generally set according to the polymer with a high melting point, which leads to the fact that the spinning process temperature of the polymer with a low melting point cannot be optimal and cannot meet the spinning requirements. The rheology of the polymer required by the process directly affects the spinning quality.

[0026] The embodiment of the present invention provides a method for preparing a bi-component monofilament compositely formed under the spinning box, which includes: cutting the dried high-melting po...

Embodiment 2

[0036] There are inevitably certain impurities in the polymer chips, which are brought into the composite spinning assembly after being melted by the screw. Due to the small size of the spinneret holes inside the composite spinning assembly, the impurities are easy to accumulate at the spinneret holes. As a result, the uniformity of the composite spinning will be adversely affected. In order to solve the above problems, the embodiment of the present invention provides the preparation method of the bi-component monofilament compositely formed under the spinning box, on the basis of Example 1, preferably, the high melting point polymer A chips go through the step "by After the A screw melts", before the step "input into the A spinning box", it is also filtered; after the low-melting point polymer B chip is passed through the step "through the B screw melting", it is in the step "input into the B spinning box". "Before, it was also filtered. Filtration treatment can purify the m...

Embodiment 3

[0040] Embodiment 3 of the present invention provides a kind of preparation method of the PA6 / PET two-component monofilament of composite forming under the spin box body, comprising:

[0041] (1) Prepare polyethylene terephthalate (PET, melting point: 290°C) slices and polyamide 6 (PA6, melting point: 140°C) slices respectively;

[0042] (2) Drying, screw melting, filtering, and static mixing are performed on the PET chips and PA6 chips respectively, and are output from the corresponding spinning boxes to obtain PET melts and PA6 melts respectively, wherein:

[0043] When drying, use a vacuum dryer with a drying temperature of 100°C; at the end of drying, the moisture content of PET chips and PA6 chips is <0.1%;

[0044] When filtering, the pore size of the filter screen using the melt filter is 40 μm, and the working pressure of the filter element is 2.5×10 6 Pa;

[0045] For static mixing, an LPD static mixer with a pipe diameter of 0.06m is used;

[0046] When the screw ...

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Abstract

The invention provides a production method of double-component monofilaments composited and formed in spinning tanks. The production method has the advantages that by setting two spinning equipment, the spinning process temperature of each stage before the high-melting-point melt and the low-melting-point melt enter a composite spinning component can be conveniently and precisely controlled, and accordingly the rheological property of two polymer required by the spinning process can be achieved, and spinning quality can be improved; before the melt A enters the composite spinning component, the melt A high in temperature is cooled through precise temperature control by a guide pipe, the temperature of the melt A entering the composite spinning component can be stabilized in a reasonable range, and accordingly the rheological property of the melt can be guaranteed, the spinnability of the double-component monofilaments can be guaranteed, the quality of the double-component monofilamentscan be increased, and the broken-filament rate and the end breakage rate of the double-component monofilaments are lowered.

Description

technical field [0001] The invention relates to a preparation method of a double-component monofilament compositely formed under a spinning box, and belongs to the field of new chemical fiber technologies. Background technique [0002] Usually, compound spinning is completed in the compound spinning group of the spin box. The bicomponent melt that makes up bicomponent monofilaments is composed of two different polymers. The melting points of the two polymers are different, so the corresponding optimum spinning process temperature is also different. When entering different polymer melts into the same spinning box for compounding, the temperature of the box is generally set according to the polymer with a high melting point, which leads to the fact that the spinning process temperature of the polymer with a low melting point cannot be optimal and cannot meet the spinning requirements. The rheology of the polymer required by the process directly affects the spinning quality. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/30D01D5/32D01D5/34D01D1/04D01D1/09D01F8/12D01F8/14
CPCD01D1/04D01D1/09D01D5/30D01D5/32D01D5/34D01F8/12D01F8/14
Inventor 华旻烨李建良汪一飞
Owner WUXI JINTONG CHEM FIBER
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