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Preparation method of deoiled hard short fibers

A short fiber and hard technology, applied in the field of preparation of deoiled hard short fibers, can solve the problems of limited application surface, moisture, weak strength, etc., and achieve the effect of increasing linear density, increasing viscosity, and sufficient fiber rigidity.

Inactive Publication Date: 2012-07-25
NINGBO DAFA CHEM FIBER
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The polyester fiber made by this conventional method has a linear density of about 2dtex, a relatively weak strength, and feels damp and soft to the touch. These characteristics make its application area very limited.

Method used

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  • Preparation method of deoiled hard short fibers

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the preferred embodiment of the preparation method of a kind of deoiled rigid staple fiber of the present invention is described in detail:

[0017] Such as figure 1 As shown, take the washed and dried polyethylene terephthalate (PET) waste fragments, and prepare polyester staple fibers according to the following steps:

[0018] ① Melt the treated PET waste in the screw extruder 1, the melting temperature is 275°C, and the time is 3 minutes; There are 20 layers of perforated plates 8, and a plurality of cylindrical through holes are arranged perpendicular to the plate surface on the perforated plates 8, and the diameter of the through holes is 10mm. The inside of the polycondensation reaction kettle 2 is kept in a vacuum state, and is controlled by the heat medium pipeline on the wall of the kettle. The temperature in the kettle was 285°C. After the melted melt is fed into the polycondensation reactor 2, polycondensation...

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Abstract

The invention relates to a fiber production method, in particular relating to a preparation method of deoiled hard short fibers. The preparation method of the deoiled hard short fibers comprises the following steps: (1) melting a raw material of polyethylene terephthalate to undergo a polycondensation reaction under a vacuum condition, wherein the reaction temperature is 280-290 DEG C so as to improve the melt viscosity; (2) delivering the melt into spinning equipment, and spinning protofilaments; (3) watering the protofilaments; and (4) drafting the watered protofilaments at the temperature of 80-100 DEG C. Before the melt is delivered to the spinning equipment for spinning, the polycondensation reaction is firstly carried out under the high-temperature vacuum condition so as to improve the melt viscosity, obviously improve the density of spun terylene short fiber yarns and increase the fiber strength; and the conventional oiling process is changed into the watering process, particularly, deionized water is used, thus, the produced fibers have the advantages of sufficient rigidity and dry and fluffy handfeel.

Description

technical field [0001] The invention relates to a method for producing fibers, in particular to a method for preparing deoiled hard short fibers. Background technique [0002] In the existing method for preparing polyester fiber, polyethylene terephthalate (PET) is first melted with a screw extruder, and then the melt is sent to spinning equipment to be spun and spun into raw silk, and then the raw silk is The oiling process is carried out, and then the drawing is carried out after the oiling, and finally prepared into polyester fibers through some follow-up processes. [0003] The polyester fiber made by this conventional method has a linear density of about 2dtex, a relatively weak strength, and feels moist and soft to the touch. These characteristics make its application area very limited. Contents of the invention [0004] The invention provides a method for preparing deoiled hard staple fibers. The polyester staple fibers produced by the method have high linear densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/62D01F11/08D01D5/096D01D5/12
Inventor 钱军王芳河邢喜全
Owner NINGBO DAFA CHEM FIBER
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