A kind of manufacturing method of polyolefin flat yarn with low thermal shrinkage rate
A manufacturing method and polyolefin technology, applied in the textile field, can solve the problems of uneven cooling, high thermal shrinkage, unevenness, etc., and achieve the effects of solving large thermal shrinkage, prolonging cooling time, and stable temperature control
Active Publication Date: 2017-05-10
HAINING JINCHAO IND
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Problems solved by technology
In the process of this development, people found that the composite plastic woven fabric produced by traditional production equipment and technology has a fatal shortcoming: high thermal shrinkage rate
The disadvantages of this wire drawing heat-setting treatment device: (1) The length of the heat-setting arc-shaped plate is short; (2) The flat wire can only be heated on one side after passing through the heat-setting arc-shaped plate; (3) The diameter of the cooling roller is small , the hollow cavity, one end of the water-cooled cooling roller surface has a large temperature difference in the length direction; (4) The cooling roller group is driven by a motor and driven by a chain or a belt
These shortcomings lead to uneven and insufficient heating and cooling of the flat yarn during the heat setting process, inconsistent molecular orientation and crystallization of the polymer chain of the flat yarn, and insufficient internal stress relief, resulting in high and uneven heat shrinkage of the flat yarn.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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[0028] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.
[0029] Such as figure 1 Shown is the heat setting device of this low thermal shrinkage polyolefin flat yarn, the manufacturing method of this low thermal shrinkage polyolefin flat yarn comprises the following steps:
[0030] a. Mix the polyolefin raw materials evenly and plasticize them through an extruder. The extruder is a T-shaped die. Heat the thermoplastic polyolefin raw materials to 220-310°C and extrude them through a T-shaped die to form a flat film, and then into the cooling water tank to cool;
[0031] b. The cooled film is cut into a flat wire 1 by a row of dense blades on the wire cutter holder;
[0032] c. Flat yarn 1 is heated by a hot arc plate and stretched under the action of stretching rollers; the heat...
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Abstract
The invention relates to a manufacturing method of a low-heat-shrinkage-rate polyolefin flat filament, which belongs to the technical field of textile, and is used for solving the problem of high heat shrinkage rate of the flat filament in the prior art. The manufacturing method of the low-heat-shrinkage-rate polyolefin flat filament comprises the steps of extruding polyolefin raw materials, forming filament, stretching, carrying out thermal forming and the like, and controlling the forming temperature of the flat filament by using a heating roller and a cooling roller in a thermal forming device, wherein the heat shrinkage rate of the flat filament can be controlled to be lower than 2%. The manufacturing method has the advantages that the temperature control is accurate and the heat shrinkage rate of the thermally formed flat filament is low.
Description
technical field [0001] The invention relates to a method for manufacturing low heat shrinkage polyolefin flat yarn, which belongs to the technical field of textiles. Background technique [0002] Composite plastic woven fabrics have been produced in China for decades, and the raw materials used are mainly polypropylene, polyethylene and ethylene-vinyl acetate copolymer. Its production process and technology are very mature. Its production process is that polypropylene or low-pressure polyethylene is extruded into a film on a wire drawing machine, cut into flat wires with dense blades, heated, stretched, heat-treated and shaped, and wound into wires. ingot. The flat yarn is woven into a plastic woven cloth by a circular loom (circular loom, water loom or projectile loom), and then coated with polypropylene or high-pressure polypropylene on one or both sides of the plastic woven cloth by a plastic extrusion compound machine. It is made of polymer materials such as ethylene o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): B29D7/01
Inventor 刘学友张峰张明华
Owner HAINING JINCHAO IND