PA66 undrawn yarn winding process

A technology of undrawn yarn and winding process, which is applied in the field of spinning and winding, which can solve the problems of low breaking strength and elongation at break, affecting product quality and production rate, and uneven denier, so as to improve the production process. High efficiency, solving the problem of yarn jumping out, uniform fineness

Inactive Publication Date: 2017-01-11
山东合信科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The breaking strength and elongation at break are both low;
[0005] (2) Poor heat resistance;
[0006] (3) The index is unstable and the fineness is uneven;
[0008] (5) The angle and position of the thread pressing rod under the oil nozzle are automatically changed during use, and the thread is easy to jump out of the oil nozzle, and oil-free threads often appear, which affects product quality and production rate

Method used

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  • PA66 undrawn yarn winding process
  • PA66 undrawn yarn winding process
  • PA66 undrawn yarn winding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 A winding process of PA66 undrawn yarn

[0043] Step 1. Pre-winding treatment

[0044] (1) Raw material selection

[0045] Slice with INVISTA HV600 PA66 resin, viscosity 3.0;

[0046] The resin slices have an oxidation index (YI) ≤ -2, a moisture content (ppm) ≤ 3000, and the appearance requirements do not allow obvious black grains, super long and sticky slices.

[0047] (2) dry

[0048] Dry the slices with a VC352 drum;

[0049] The drying process is as follows: the drying temperature is 120°C, the drying time is 4 hours, the drying vacuum is -0.078MPa, and the moisture content of the slices is 850ppm.

[0050] (3) extrusion melting

[0051] The temperature of the spinning melt is 295°C, and the extrusion melting is carried out by using a screw extruder. The extrusion melting parameters are shown in Table 1 below.

[0052] Table 1 Parameters of extrusion melting

[0053]

[0054] (4) Assembly of components

[0055] Add 150-mesh stainless steel mes...

Embodiment 2

[0067] Example 2 A winding process of PA66 undrawn yarn

[0068] Step 1. Pre-winding treatment

[0069] (1) Raw material selection

[0070] Slice with INVISTA HV600 PA66 resin, viscosity 3.0;

[0071] The resin slices have an oxidation index (YI) ≤ -2, a moisture content (ppm) ≤ 3000, and the appearance requirements do not allow obvious black grains, super long and sticky slices.

[0072] (2) dry

[0073] Dry the slices with a VC352 drum;

[0074] The drying process is as follows: the drying temperature is 122°C, the drying time is 3.7 hours, the drying vacuum is -0.077MPa, and the moisture content of the slices is 835ppm.

[0075] (3) extrusion melting

[0076] The temperature of the spinning melt is 294°C, and a screw extruder is used for extrusion melting. The extrusion melting parameters are shown in Table 2.

[0077] Table 2 Parameters of extrusion melting

[0078]

[0079] (4) Assembly of components

[0080] Add 150-mesh stainless steel mesh in front of the sp...

Embodiment 3

[0086] Example 3 A winding process of PA66 undrawn yarn

[0087] Step 1. Pre-winding treatment

[0088] Include the following steps:

[0089] (1) Raw material selection

[0090] Slice with INVISTA HV600 PA66 resin, viscosity 3.0;

[0091] The resin slices have an oxidation index (YI) ≤ -2, a moisture content (ppm) ≤ 3000, and the appearance requirements do not allow obvious black grains, super long and sticky slices.

[0092] (2) dry

[0093] The slices were dried with a VC352 drum; the drying process was as follows: the drying temperature was 125°C, the drying time was 5.3 hours, the drying vacuum was -0.082MPa, and the moisture content of the slices was dried to 650ppm.

[0094] (3) extrusion melting

[0095] The temperature of the spinning melt is 290°C, and a screw extruder is used for extrusion melting. The extrusion melting parameters are shown in Table 3 below.

[0096] Table 3 Extrusion Melting Parameters

[0097]

[0098] (4) Assembly of components

[0099]...

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Abstract

The invention provides a PA66 undrawn yarn winding process, which comprises winding and winding pretreatment, wherein during winding, the concentration of an oil agent is 13.6 to 14.3 percent. The prepared PA66 undrawn yarn is characterized in that the fiber number is 230+/-10dtex; the breaking strength of the prepared PA66 undrawn yarn is 400 to 450cN; the strength CV is 5.3 to 8 percent; the elongation at break is 260 to 300 percent; the elongation CV at break is 5.5 to 8 percent; the heat resistance index (four minutes at 240 DEG C) is shown as follows: when the breaking strength is 330 to 394cN, the heat resistance index is redued by 12.4 to 17 percent, and when the breaking elongation is 210 to 262 percent, the heat resistance index is reduced by 12.5 to 19 percent. The prepared PA66 undrawn yarn has the advantages that the indexes are stable; the fiber number is uniform; the unwinding of the subsequent work procedure is good; the yarn core quality requirement of the elastic weft yarn is met; the fiber number unevenness rate is 1.85 to 2.7 percent.

Description

technical field [0001] The invention provides a PA66 undrawn yarn winding process, which belongs to the technical field of spinning and winding. Background technique [0002] PA66 (nylon) unstretched yarn is used for the yarn core of tire cord weft yarn, and can be used to prepare tire cord fabric. At present, the multifilament yarn with a monofilament fineness of 6 denier is mainly used in the cord fabric industry. Add a certain twist to the filaments, and then ply them into cords. Because there is a process of twisting the filaments in the subsequent process, usually straight yarn multifilaments are used, that is, the single filaments are permanently parallel. [0003] When used in the yarn core of tire cord weft yarn, PA66 undrawn yarn has the following disadvantages: [0004] (1) The breaking strength and elongation at break are both low; [0005] (2) Poor heat resistance; [0006] (3) The index is unstable and the fineness is uneven; [0007] (4) The termination rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D7/00D01D11/00D01D5/08D01D5/088D01D4/02D01D1/10
CPCD01D7/00D01D1/106D01D4/02D01D5/08D01D5/088D01D11/00
Inventor 李国栋
Owner 山东合信科技股份有限公司
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