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Manufacturing method of large-diameter and high-viscosity polyester monofilament

A technology of polyester monofilament and production method, which is applied to the melting of filament raw materials, melt spinning, filament forming treatment, etc., can solve the problems of increased broken filaments, high breaking strength, melt fracture, etc., and achieve reduction in dryness Thermal shrinkage rate, effect of increasing breaking strength

Inactive Publication Date: 2013-12-25
XUZHOU SILK FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for making a large-diameter high-viscosity polyester monofilament with high breaking strength and wear resistance for the defects of existing polyester monofilament products.
Produce monofilaments by determining polyester slices with moderate viscosity, so as to overcome the defects of ugly appearance, low strength and short life of monofilament filter screens in the prior art, and at the same time avoid melt fracture and increase fracture due to excessive molecular weight of slices. Silk situation arises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The first step: The polyester chip raw material (intrinsic viscosity [η] = 0.65) is subjected to solid-state polycondensation of polyester to increase the intrinsic viscosity of the polyester chip to 0.915.

[0024] Step 2: Dry and crystallize the viscosified polyester chips through a vacuum polyester dryer at a drying temperature of 130° C. for 4 hours to reduce the moisture content of the polyester chips to 75 ppm.

[0025] The third step: melting and drying slices.

[0026] Step 4: The melt is uniformly extruded through a metering pump, and passes through a die with a die hole diameter of 2.4 mm and a length-to-diameter ratio of 7 to form multiple primary monofilaments.

[0027] Step 5: The nascent monofilament goes to the first stretching machine, and the second stretching machine is pre-stretched.

[0028] Step 6: Use double bellows in series with hot air for shaping, the temperature of the two shaping bellows is the same, the temperature is 220°C, the speed of th...

Embodiment 2

[0032] The first step: the polyester chip raw material (intrinsic viscosity [η] = 0.65) is subjected to solid-state polycondensation of polyester to increase the intrinsic viscosity of the polyester chip to 0.9.

[0033] Step 2: Dry and crystallize the viscosified polyester chips through a vacuum polyester dryer at a drying temperature of 130° C. for 4 hours to reduce the moisture content of the polyester chips to 30 ppm.

[0034] The third step: melting and drying slices.

[0035] Step 4: The melt is uniformly extruded through a metering pump, and passes through a die with a die hole diameter of 2.2 mm and a length-to-diameter ratio of 7.5 to form multiple primary monofilaments.

[0036] Step 5: The nascent monofilament goes to the first stretching machine, and the second stretching machine is pre-stretched.

[0037] Step 6: Use double bellows in series with hot air for shaping, the temperature of the two shaping bellows is the same, the temperature is 220°C, the speed of th...

Embodiment 3

[0041] The first step: The polyester chip raw material (intrinsic viscosity [η] = 0.65) is subjected to solid-state polycondensation of polyester to increase the intrinsic viscosity of the polyester chip to 1.0.

[0042] Step 2: Dry and crystallize the viscosified polyester chips through a vacuum polyester dryer at a drying temperature of 130° C. for 4 hours to reduce the moisture content of the polyester chips to 50 ppm.

[0043] The third step: melting and drying slices.

[0044] Step 4: The melt is uniformly extruded through a metering pump, and passes through a die with a die hole diameter of 2.5 mm and a length-to-diameter ratio of 8 to form multiple primary monofilaments.

[0045] Step 5: The nascent monofilament goes to the first stretching machine, and the second stretching machine is pre-stretched.

[0046] Step 6: Use double bellows in series with hot air for shaping, the temperature of the two shaping bellows is the same, the temperature is 220°C, the speed of the ...

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Abstract

The invention provides a manufacturing method of a large-diameter and high-viscosity polyester monofilament. The method comprises the working procedures of tackifying low-viscosity polyester chip raw material by polyester solid phase polycondensation to increase the intrinsic viscosity to be eta which is within the range of 0.9-1.0; drying the tackified polyester chip by a vacuum polyester dryer for crystallization, and enabling the water content of the polyester chip to be lower than 100ppm; melting the dried polyester chip to form polyester melt; evenly extruding the polyester melt by a metering pump, and forming primary monofilament by a mould; stretching the primary monofilament twice respectively in a prestretching way and an all-stretching way; shaping the stretched primary monofilament to form the large-diameter and high-viscosity polyester monofilament. The product obtained by the method can overcome the defects in the prior art, and avoids the phenomena of melt fracture and filament break increase caused by the overhigh intrinsic viscosity of the polyester chip raw material and the overlarge molecular weight of the polyester chip. Furthermore, by adopting the special drying procedure, the method reduces the dry heat shrinkage rate of the monofilament and improves the breaking strength of the monofilament.

Description

technical field [0001] The invention relates to a production process of industrial monofilament, which belongs to the field of chemical fibers, in particular to a production method of large-diameter and high-viscosity polyester monofilament. technical background [0002] Monofilament is a single filament, generally greater than 0.08mm in diameter. Polymer monofilament has good wear resistance, the practical effect is better than that of metal wire, and its rigidity is higher than that of multifilament, which can strengthen the fabric in a certain direction. The low surface area and high volume make the fabric less susceptible to pollution and has a Helps resist hydrolysis. Monofilaments give fabrics a "macroporous" structure, which is important for filtration and sieving, especially grading. [0003] Generally, polyester monofilaments are directly melt-spun from low-viscosity (intrinsic viscosity [η]=0.65) polyester chips or recycled polyester chips after drying. The disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D13/00D01D1/04D01D1/00D01D5/08
Inventor 孙德荣张堂标朱延伟叶静
Owner XUZHOU SILK FIBER TECH
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