A method for large-scale production of polyester staple fiber using PET bottle flakes

A technology of polyester staple fiber and bottle flakes, applied in the field of polyester staple fiber production, can solve problems such as unfavorable spinning, high melt viscosity, high stability requirements, unstable production, etc., to solve inconsistent drying quality and meet various varieties The effect of softening and shortening the drying time

Active Publication Date: 2018-01-30
扬州天富龙科技纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drying in these methods usually adopts traditional polyester chip spinning and drying equipment, which is only suitable for processing raw polyester chips, and the drying effect of recycled bottle flakes is not uniform, which brings troubles to subsequent processing
The filter devices in these production methods adopt a single-stage filter structure, which cannot adapt to the characteristics of many impurities in bottle flakes, frequent replacement of filter components, high production costs, and even abnormal and unstable production.
Polyester bottle flakes have high intrinsic viscosity, uneven quality, irregular shape, and low bulk density, which cause problems such as large screw shear force, large reflux, and temperature out of control. The existence of fine powder in bottle flakes will cause melt degradation. Cause melt viscosity to drop, which is not good for spinning
At the same time, the large-scale production of dyeability and cotton-type fine-denier polyester staple fiber has high requirements on the viscosity and stability of the polyester bottle flake melt. However, the existing recycled polyester bottles come from different sources, with many impurities and melt The viscosity of the body fluctuates greatly. The above reasons make it impossible to realize large-scale production of dyeable and cotton-type fine-denier polyester staple fibers from recycled PET bottle flakes.

Method used

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  • A method for large-scale production of polyester staple fiber using PET bottle flakes
  • A method for large-scale production of polyester staple fiber using PET bottle flakes

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for large-scale production of polyester staple fibers utilizing PET bottle flakes is characterized in that it specifically comprises the steps:

[0033] (1) Raw material pretreatment: Clean and remove the recycled PET bottles, crush them into flakes and dry them with a pulverizer, control the pressure of the cyclone separator to 1100-1250Pa, and the gas volume to 3800-4100m 3 / h, separate the dust in the bottle flake material from the fine bottle flake powder, and dry it in a vacuum drying drum. The drying time is 8-10 hours, and the moisture content after drying is ≤0.015%;

[0034](2) Melt filtration: The dried bottle flakes enter the screw extruder for extrusion and melting. The temperature in the cooling zone of the screw extruder is ≤100°C, and the temperature in the first to sixth areas is 282-310°C. The viscosity is 0.560±0.001dl / g~0.715±0.001dl / g, the screw outlet pressure is 7.5±0.1MP, and the obtained melt is sent to a two-stage filter device for fil...

Embodiment 2

[0048] When producing 1.67dtex dyeable, cotton-type polyester staple fiber, the production process is as follows:

[0049] A method for large-scale production of polyester staple fibers utilizing PET bottle flakes is characterized in that it specifically comprises the steps:

[0050] (1) Raw material pretreatment: recycle PET bottles with intrinsic viscosity IV=0.740dl / g bottle flakes, wash and remove impurities from the recovered PET bottles, then crush them into flakes and dry them, and use the hot cyclone separation method of cyclone separator Separate the dust and fine bottle flake powder in the bottle flakes, and dry them in a vacuum drying drum equipped with a built-in agitator. The drying temperature of the drum is controlled at 135-145 °C, and the drum speed is 4- 6r / min, the drying time is 8-10 hours, the moisture content of incoming raw materials is ≤5.0-6.0%; the moisture content after drying is ≤0.015%;

[0051] (2) Melt filtration: the dried bottle flakes enter t...

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Abstract

The invention discloses a method for large-scale production of polyester staple fiber by using PET bottle flakes, which is characterized in that it specifically comprises the following steps: (1) Raw material pretreatment: adopting a machine equipped with a built-in agitator and an automatic moisture discharge valve Vacuum drying in the drum to achieve small batch and multi-variety production; (2) Melt filtration: the flakes enter the screw extruder for extrusion and melting, and the melt is filtered through a two-stage filter device to ensure that the melt (3) cutting and mixing: improve the uniformity and stability of melt viscosity; (4) high-speed spinning: the melt after cutting and mixing is filtered through multi-stage classification in the spinning box to obtain thicker, wet (5) Drying and shaping: The wet polyester yarn after plying is treated with hot water in an oil bath, drafted, dried, and shaped to obtain the required cotton-type fiber. The invention can realize a daily output of 120 tons and an annual output of 40,000 tons or more.

Description

technical field [0001] The invention belongs to the technical field of polyester staple fiber production, and relates to a method for large-scale production of polyester staple fiber, in particular to a method for large-scale production of dyeable and cotton-type polyester staple fiber using PET bottle flakes. Background technique [0002] The traditional method of producing polyester staple fiber uses virgin polyester chips as raw material. The raw material is characterized by high purity, stable viscosity and low water content. Its production process is short, and the specific process is raw material-test-screening-drying-screw melt extrusion-first-stage filtration-spinning-winding-drawing-curling-drying and shaping-finished product packaging, the disadvantage is high cost, Extensive consumption of oil resources. For this reason, people are actively looking for the method of producing polyester staple fiber with other raw materials such as PET (polyester) bottle flakes, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/04D01D1/10D01D5/08D01D10/02D01D5/12D01F6/62
Inventor 周国祥杨高林
Owner 扬州天富龙科技纤维有限公司
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