Multi-stage drafting device and method for nylon 6 high-strength yarn

A drafting device and drafting technology, used in textiles and papermaking, can solve the problems of reduced elongation at break, short setting time, and reduced toughness, so as to improve the degree of fiber orientation and strength, avoid the reduction of fiber toughness, and prevent the effect of orientation

Inactive Publication Date: 2019-01-18
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, nylon 6 high-strength yarns in industrial production are generally formed by one-time drafting, and the setting time is short. The fibers will be de-oriented during storage, transportation and use, resulting in loss of fiber strength, reduced elongation at break, and effective filaments. The draft ratio is reduced, so in actual production, the method of increasing the draft ratio of the filament is usually used to increase the strength of the filament
However, a higher draft ratio will lead to more fiber hairs, an increase in end breakage rate, and a decrease in production efficiency. At the same time, the draft ratio is too high, the filament feels rough and the toughness decreases

Method used

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  • Multi-stage drafting device and method for nylon 6 high-strength yarn

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Experimental program
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Effect test

Embodiment 1

[0021] Nylon 6 slices with a viscosity of 2.4 are fed into the feeder and then melted and extruded through a twin-screw extruder. The temperature of the first zone of the twin-screw extruder is 225°C, the temperature of the second zone is 240°C, and the temperature of the third zone is 245°C. , the temperature in the fourth zone is 250°C, the temperature of the machine head is 255°C, and the polyamide 6 melt passes through the double-side air cooling with a temperature of 20°C after spinning from the spinneret, a wind speed of 0.5m / s, and a relative humidity of 75%. , The spinning speed is 4500m / min. The spinning that is spun out is carried out drafting three times, and the drafting multiple of one-stage drafting is 2.60, and the drafting multiple of secondary drafting is 1.80, and the drafting multiple of three-stage drafting is 1.05, and the first drafting hot roll The temperature of 1 is 50 ℃, the temperature of the second drafting hot roller 2 is 100 ℃, the temperature of ...

Embodiment 2

[0023] Nylon 6 slices with a viscosity of 2.4 are fed into the feeder and then melted and extruded through a twin-screw extruder. The temperature of the first zone of the twin-screw extruder is 225°C, the temperature of the second zone is 240°C, and the temperature of the third zone is 245°C. , the temperature in the fourth zone is 250°C, the temperature of the machine head is 255°C, and the polyamide 6 melt passes through the double-side air cooling with a temperature of 20°C after spinning from the spinneret, a wind speed of 0.5m / s, and a relative humidity of 75%. , The spinning speed is 4500m / min. The silk that is spun out is carried out drafting three times, and the drafting multiple of first-stage drafting is 2.60, and the drafting multiple of secondary drafting is 1.80, and the drafting multiple of three-stage drafting is 1.05, and the first drafting hot roller 1 The temperature is 55°C, the temperature of the second drafting hot roll 2 is 105°C, the temperature of the t...

Embodiment 3

[0025] Nylon 6 slices with a viscosity of 2.4 are fed into the feeder and then melted and extruded through a twin-screw extruder. The temperature of the first zone of the twin-screw extruder is 225°C, the temperature of the second zone is 240°C, and the temperature of the third zone is 245°C. , the temperature in the fourth zone is 250°C, the temperature of the machine head is 255°C, and the polyamide 6 melt passes through the double-side air cooling with a temperature of 20°C after spinning from the spinneret, a wind speed of 0.5m / s, and a relative humidity of 75%. , The spinning speed is 4500m / min. The spun silk is drawn three times, the draft multiple of the primary draft is 2.6, the draft multiple of the secondary draft is 1.80, the draft multiple of the third draft is 1.05, and the first draft hot roller 1 The temperature of the hot plate is 70°C, the temperature of the second drafting hot roller 2 is 120°C, the temperature of the third drafting hot roller 3 is 178°C, the...

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Abstract

The invention relates to a multi-stage drafting device and method for nylon 6 high-strength yarn, wherein the drafting device comprises a first drafting hot roller, a second drafting hot roller, a third drafting hot roller and a drafting cold roller which are sequentially arranged in parallel, the first drafting hot roller and the second drafting hot roller are horizontally arranged, and the thirddrafting hot roller and the drafting cold roller are horizontally arranged, the third drafting hot roller is positioned to the upper right of the second drafting hot roller, and a hot plate is arranged between the third drafting hot roller and the drafting cold roller. The drafting method includes: the temperature of the first drafting hot roller is set to be 50-70 DEG C, the temperature of the second drafting hot roller is set to be 100-120 DEG C, the temperature of the third drafting hot roller is set to be 160-180 DEG C, the temperature of the hot plate is set to be 180-190 DEG C, and thedrafting multiple between the first drafting hot roller and the second drafting hot roller is 1.90-2.60, the drafting multiple between the second drafting hot roller and the third drafting hot rolleris 1.40-1.80, and the drafting multiple between the third drafting hot roller and the drafting cold roller is 1.05-1.25. The device can enhanced the shaping effect of the nylon 6 filament, improve thetenacity of the filament, and enhance the strength of the filament by raising the orientation degree of the filament.

Description

technical field [0001] The invention belongs to the technical field of nylon 6 filament drawing, and in particular relates to a multi-stage drawing device and method for nylon 6 high-strength yarn. Background technique [0002] Polyamide 6 is the most productive variety among polyamides. The material has excellent performance, excellent wear resistance, alkali resistance, low temperature resistance, good moisture absorption performance, relatively high mechanical strength, and is widely used in the field of textile and clothing. After years of development, ordinary textiles can no longer meet the needs of social development. Based on the high breaking strength, wear resistance and corrosion resistance of polyamide 6, it has a broad prospect in industrial applications besides clothing. Nylon 6 high-strength yarn is popular in ribbons, bags, and lace, and is widely used in military, high-end luxury goods and other fields. [0003] The preparation of high-strength nylon 6 fil...

Claims

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Application Information

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IPC IPC(8): D02J1/22
CPCD02J1/224D02J1/225D02J1/228
Inventor 李发学周怡琰吴德群王学利俞建勇陈立军
Owner DONGHUA UNIV
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