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A kind of melt-blown nozzle structure for fiber preparation

A nozzle and melt-blown technology, which is applied in spinneret assemblies, textiles and papermaking, etc., can solve the problems of high requirements for processing accuracy, increased difficulty in processing spinneret holes, and difficulty in processing spinneret holes, and saves costs. , The effect of reducing fiber diameter and high air velocity

Active Publication Date: 2018-01-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the processing accuracy of the pointed nozzle is very high, the processing of the spinneret hole is difficult, and the problem of final fiber thickening caused by the extrusion expansion of the polymer melt cannot be improved.
Reducing the diameter of the spinneret hole and increasing the aspect ratio of the spinneret hole can also reduce the fiber diameter, but both will increase the processing difficulty of the spinneret hole, and the too small diameter of the spinneret hole will also make the raw material adaptability of the melt blown technology change. Difference

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A kind of melt-blown nozzle structure for fiber preparation
  • A kind of melt-blown nozzle structure for fiber preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The polymer melt is extruded from the nozzle, and the high-speed and high-temperature gas is ejected from the slot-shaped air flow channel 2 and the air flow auxiliary channel 3 simultaneously. Wherein, the air flow angle of the nozzle is 60°, the slot width e of the air flow channel is 0.6 mm, and the spinneret hole diameter c is 0.3 mm. The airflow auxiliary channel width d=0.2mm of the meltblown nozzle part with airflow auxiliary channel, the height of the straight section of the airflow auxiliary channel h=50mm, and the radius of the arc section of the airflow auxiliary channel r=45mm. The raw material polypropylene is provided, the melt flow rate is 800g / 10min, the flow rate is 0.057g / s, the initial temperature is 280°C, the gas pressure is 500kPa, and the initial gas temperature is 290°C.

[0039] The average diameter of the fibers obtained under the above conditions is 641nm, while the average fiber diameter of the nonwoven fabric prepared by the melt-blown nozzl...

Embodiment 2

[0041] The polymer melt is extruded from the nozzle, and the high-speed and high-temperature gas is ejected from the slot-shaped air flow channel and the air flow auxiliary channel at the same time. Wherein, the air flow angle of the nozzle is 60°, the slot width e is 0.6 mm, and the spinneret hole diameter c is 0.3 mm. The airflow auxiliary channel width d=0.15mm of the melt-blown nozzle part with airflow auxiliary channel, the height of the straight section of the airflow auxiliary channel h=45mm, and the radius of the arc section of the airflow auxiliary channel r=35mm. The raw material polypropylene is provided, the melt flow rate is 1000g / 10min, the flow rate is 0.022g / s, the initial temperature is 290°C, the gas pressure is 500kPa, and the initial gas temperature is 310°C.

[0042] The average diameter of the fibers obtained under the above conditions is 428nm, while the average fiber diameter of the nonwoven fabric prepared by the melt-blown nozzle without air flow auxi...

Embodiment 3

[0044] The polymer melt is extruded from the nozzle, and the high-speed and high-temperature gas is ejected from the slot-shaped air flow channel and the air flow auxiliary channel at the same time. Wherein, the air flow angle of the nozzle is 60°, the slot width e is 0.6 mm, and the spinneret hole diameter c is 0.3 mm. The airflow auxiliary channel width d=0.15mm of the meltblown nozzle part with airflow auxiliary channel, the height of the straight section of the airflow auxiliary channel h=45mm, and the radius of the arc section of the airflow auxiliary channel r=40mm. The raw material polypropylene is provided, the melt flow rate is 100g / 10min, the flow rate is 0.008g / s, the initial temperature is 290°C, the gas pressure is 450kPa, and the initial gas temperature is 330°C.

[0045] The average diameter of the fibers obtained under the above conditions is 728nm, while the average fiber diameter of the nonwoven fabric prepared by the melt-blown nozzle without air flow auxili...

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Abstract

The invention discloses a melt-blow nozzle structure for fiber preparation; an airflow secondary path is arranged close to a spinneret hole; the airflow enters a nozzle part and divides into two parts, wherein one part airflow enters an airflow path, and the other part airflow enters the airflow secondary path. An air outlet of the airflow secondary path is parallel to the spinneret hole, and the outlet of the airflow secondary path is flush with a spinneret hole outlet; polymer melt is extruded from the spinneret hole and clamped by the airflow sprayed from the airflow secondary path; an air backflow zone between the expanded melt and the nozzle is largely minimized when compared with a melt-blow nozzle with no airflow secondary path; the airflow direction in the air backflow zone is basically same with a polymer melt stretching direction; airflow speed is very high, so polymer stretching is convenient, and fiber diameter of melt-blow non-woven cloth can be reduced without adding energy consumption; the diameter of the prepared fiber can be reduced by more than 56% when compared with that of the fiber prepared by a melt-blow nozzle with no airflow secondary path, thus reaching the nanometer level scale.

Description

technical field [0001] The invention belongs to the technical field of melt-blown nonwoven equipment, and in particular relates to a melt-blown nozzle structure for fiber preparation. Background technique [0002] Non-woven fabrics refer to sheet-like products made directly from fibers without the usual spinning and weaving process, commonly known as non-woven fabrics. The advantages of nonwovens are short process flow, high production speed, and wide product uses. The melt blown method is a method mainly used to prepare ultrafine fiber nonwovens. It uses high-speed, high-temperature airflow to draw polymer melt into ultrafine fibers. Microfibers have a diameter between 1 μm and 5 μm. Melt-blown nonwovens are widely used in medicine, metallurgy, electronics, chemical industry, food, machinery, nuclear industry, automobile, etc. due to their ultra-fine fibers, many pores, and small pore size. It can also be used as an advanced filter material for environmental purificatio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D4/02
CPCD01D4/025
Inventor 陈廷吴丽莉杨康殷祝平
Owner SUZHOU UNIV