Method for preparing sheath core composite long fiber with low melting point

A low melting point, long fiber technology, applied in fiber processing, conjugated synthetic polymer artificial filament, filament molding treatment, etc., can solve the problems of low fiber shrinkage, low melting point, etc., to achieve excellent spinning performance, cortex Effect of low melting point and low shrinkage

Inactive Publication Date: 2010-01-06
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, in the prior art, there is no fiber with low...

Method used

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  • Method for preparing sheath core composite long fiber with low melting point
  • Method for preparing sheath core composite long fiber with low melting point

Examples

Experimental program
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Embodiment 1

[0031] The cortex is made of low-melting copolyester with a melting point of 104°C and an intrinsic viscosity I.V of 0.98dL / g, using vacuum drum drying equipment, under the condition of a vacuum degree of less than 0.1KPa, at a temperature of 60°C and 80°C respectively Continuous drying for 18 hours, the water content of the dry slices was measured to be 88ppm; the core layer uses PA6 as the dried slices, and the relative viscosity ηr is 2.2; the temperature of each zone of the cortical component screw extruder is set to 160 / 180 / 200 / 220 / 250°C, the temperature of each zone of the core component screw extruder is set at 280 / 270 / 265 / 260 / 260°C, the temperature of the spinning box is set at 260°C, the compounding ratio is 50:50, and the product specification is 110dtex / 36f. The side blowing wind speed is 0.6 m / s, the wind temperature is 20°C, the oil is oiled by the tanker, the tension is controlled by the godet, and the spinning speed is 4000m / min.

Embodiment 2

[0033] The process steps of this embodiment and embodiment 1 are basically the same, and the difference is that the cortex is selected as a low-melting copolyester with a melting point of 115°C and an intrinsic viscosity I.V of 1.01dL / g, using vacuum drum drying equipment, and drying in a vacuum. Under the condition that the temperature is less than 0.1KPa, it was dried continuously for 12 hours at the temperature of 70°C and 90°C respectively, and the water content of the dry slice was measured to be 85ppm. The core layer is made of polytrimethylene terephthalate (PTT), the intrinsic viscosity is 0.92dL / g, and the water content measured by conventional crystallization drying is 40ppm. The rest of the steps are the same.

Embodiment 3

[0035] The process steps of this embodiment are basically the same as those of Embodiment 1, except that the skin-to-core composite ratio is 60:40, the side blowing wind speed is 0.7 m / s, and the spinning speed is 3500 m / min. The rest of the steps are the same.

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Abstract

The invention discloses a method for preparing a sheath core composite long fiber with a low melting point, which comprises the following steps: (1) drying components of a sheath layer and a core layer; (2) preparing a sheath core composite long fiber with a low melting point; respectively melting and extruding the two components by a screw rod extruder, after fusant is metered by a metering pump, leading the fusant to flow into an assembly of a composite spinning machine to carry out the composite spinning of the two components and ejecting a fiber from a fiber ejecting plate; cooling the fiber by blowing, oiling the fiber by an oil tanker, controlling the tension of the fiber by a fiber guide disk and coiling the fiber to obtain the sheath core composite long fiber with the low melting point. Aiming at the defects in the prior art, the invention provides a method for preparing the sheath core composite long fiber with a low melting point, which has low sheath layer melting point, low and stable fiber boiling water shrinking rate and favorable dyeing performance.

Description

technical field [0001] The invention relates to a preparation method of a low-melting point sheath-core composite long fiber, especially a low-melting point copolyester with a melting point of 90-130°C as the skin layer, a crystalline high polymer as the core layer, and a composite of the skin layer and the core layer. The skin-core composite long fiber with a ratio of 20:80-80:20 and a shrinkage rate of 10-20% in boiling water and a preparation method thereof belong to the field of chemical fibers. Background technique [0002] The emergence of low melting point fibers (or fibers for thermal bonding) has had an important impact on the improvement of nonwovens production process and product development. For example, adding a certain proportion of low-melting point fibers, the products produced by the hot air nonwoven process have better bulkiness, softness and sanitation, and the products have a wide range of applications and have been developed rapidly. [0003] For exampl...

Claims

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Application Information

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IPC IPC(8): D01D5/34D01D1/00D01D1/09D01F8/14D01F8/12
Inventor 王秀华陈文兴
Owner ZHEJIANG SCI-TECH UNIV
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