Production technology and production line of high-strength PET (polyethylene terephthalate) flat yarn for freight bag

A production process and high-strength technology, applied in the production of complete sets of equipment for artificial threads, filament/thread forming, heat treatment of artificial filaments, etc., can solve problems such as easy deformation, avoid broken threads, high strength, and optimize drafting Effect of Process Parameters

Inactive Publication Date: 2014-12-24
CHANGZHOU RUNYI MACHINERY MFR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the deficiency that PET flat yarn is easily deformed after drawing in the prior art, and provides a production process and equipment for high-strength PET flat yarn for container bags. The present invention changes the existing flat yarn production process, making PET flat yarn The yarn will not deform after winding or weaving into bulk bags

Method used

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  • Production technology and production line of high-strength PET (polyethylene terephthalate) flat yarn for freight bag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, (1) crush waste PET bottle materials (recycled mineral water bottles) (if necessary, add appropriate amount of additives, such as tougheners, antioxidants or fillers, etc., according to actual production needs) into pieces smaller than 15x15mm The pellets, after drying, are added to the extruder 2, and the temperature of the extruder is set at 260-270°C. The raw material enters the metering pump 1 in a molten state through the extruder, and the metering pump 1 measures the molten PET material into the die head as required. , and extrude from the narrow slit of the die head, and form a PET film after cooling in the cooling tank 3 with a temperature of 50-60°C;

[0022] (2) Use the cutting device 4 to cut the film in the longitudinal direction, and then pass it through the drafting hot water tank 5 under the condition of 100°C under the action of the first drafting roller 6 (drafting five rollers). Once drafting, the drafting ratio is 2.5 to 3 ...

Embodiment 2

[0026] (1) Put low-viscosity (0.68-0.8d1 / g) PET new material (if necessary, add appropriate amount of additives, such as toughening agent, antioxidant or filler, etc., according to actual production needs) at 150-170 ° C Pre-crystallization, and then add extruder 2, set the temperature of the extruder to 250 ~ 270 ℃, the raw material enters into the metering pump 1 in a molten state through the extruder, and the metering pump 1 will meter the PET material in the molten state into the mold as required The head is extruded from the narrow slit of the die, and the PET film is formed after cooling by water in the cooling tank 3;

[0027] (2) Use the cutting device 4 to cut the film in the longitudinal direction, and then pass it through the drafting hot water tank 5 under the condition of 100°C under the action of the first drafting roller 6 (drafting five rollers). Once drawn, the draw ratio is 2.5 to 3 times; under the action of the second draft roller 8 (drawing five rollers), ...

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Abstract

The invention provides a production technology and a production line of a high-strength PET (polyethylene terephthalate) flat yarn for a freight bag. The technology comprises the steps of (1) drying PET raw material, then carrying out pre-crystallization, feeding the product into a screw extruder, and cooling the extruded product by water bath to obtain a diaphragm; (2) drafting: chopping the diaphragm cooled in the step (1) by a chopping device, heating and then carrying out primary drafting; heating again and carrying out secondary drafting; (3) shaping: heating the material obtained by drafting to remove stress, shaping the product by a shaping roller, and then winding to obtain the high-strength PET flat yarn. After the production technology and the production line are adopted, drafting technological parameters are optimized, the problem that the yarn is broken in the drafting process is avoided, and the produced PET flat yarn is high in strength; the process for removing the stress is added, so that the stress generated in the flat yarn drafting process is removed, and the flat yarn fabric is not contracted and deformed due to the existence of stress; a waste PET bottle is also suitable for the production technology and the production line, thus being recovered and utilized.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and in particular relates to a production process of high-strength PET flat yarn. Background technique [0002] At present, the plastic flat wire manufactured, sold and used both at home and abroad is made of PP or PE as a raw material, and then woven into plastic container bag packaging items. The mechanical properties, UV resistance, and low temperature resistance of PET are better than PP and PE, so PET materials have great potential utilization value. Moreover, PET raw materials come from a wide range of sources. For example, packaging bottles for mineral water or beverages in daily life are mostly made of PET materials. Recycling waste PET bottle materials as raw materials further reduces production costs. [0003] However, due to the high glass transition temperature of PET, low melt viscosity, high molecular rigidity, slow rearrangement movement, and low crystallization rate, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D13/00D01D5/42D01D5/12D01D10/02
Inventor 陈刚
Owner CHANGZHOU RUNYI MACHINERY MFR
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