Melt-blown non-woven fabric electret adding device and adding method

A technology of melt-blown non-woven fabrics and adding devices, which is applied in the directions of melt-spinning, non-woven fabrics, textiles and papermaking, etc., can solve the problems of limited filtration efficiency improvement, downtime for maintenance, broken filaments, etc., and achieves good filtration performance stability. , The effect of maintaining lasting static electricity and improving production efficiency

Pending Publication Date: 2020-11-03
ZHEJIANG CHENWEI ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many shortcomings in the existing electret blending and adding method
First of all, it is difficult to adjust the amount of addition in a large range
Electrets are generally inorganic materials such as tourmaline. Excessive addition of tourmaline will reduce the toughness of the melt-blown fiber, resulting in broken wires and other phenomena, which will weaken the filtration efficiency, so the addition amount should not be too much; The electret effect is not good, and the improvement of filtration efficiency is limited
Secondly, the large particle size particles in the inorganic electret material are easy to block the spinneret hole, causing downtime for maintenance, resulting in a decrease in the production efficiency of meltblown fibers and an increase in cost

Method used

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  • Melt-blown non-woven fabric electret adding device and adding method
  • Melt-blown non-woven fabric electret adding device and adding method
  • Melt-blown non-woven fabric electret adding device and adding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: The electret material tourmaline is mixed and co-extruded with polypropylene having a melt index MFI=1500 to form an electret masterbatch. Polypropylene particles with a melt index MFI=1800 are used, and the melt-blown fiber resin and the electret masterbatch (the mass percentage of tourmaline added is 0.5wt%-6.2wt%) are added to the extruder for melt blending at the same time, and the extrusion temperature is 250°C , the melt temperature is 255°C, and it is sprayed into filaments in the form of a blend through the spinneret hole to form a fine spinning stream. The temperature of the spinning box is 255°C, and there are high-speed hot airflows on both sides of it to clamp the high-temperature melt stream. The temperature of the traction wind is 265°C, and ultrafine fiber form is formed after traction and stretching. Gather into a network structure at a certain speed on the receiving device, with a weight of about 30g / m 2 . The fiber web is subjected to h...

Embodiment 2

[0045] Embodiment 2: Electret material gas phase method SiO 2 Mixed and co-extruded with polypropylene with melt index MFI=1500 to form electret masterbatch. Polypropylene particles with melt index MFI=1800, melt-blown fiber resin and electret masterbatch (SiO 2 Adding mass percentage is 0.5wt%-4.3wt%) at the same time into the extruder for melt blending, the extrusion temperature is 250 ° C, the melt temperature is 255 ° C, and the blend is sprayed into filaments through the spinneret hole to form a spinning Fine silk flow, the temperature of the spinning box is 255°C, the high-speed hot air flow on both sides clamps the high-temperature melt fine flow, the temperature of the traction wind is 265°C, and the ultra-fine fiber form is formed after traction and stretching. Gather into a network structure at a certain speed on the receiving device, with a weight of about 30g / m 2 . The fiber web is subjected to high-voltage electrostatic action (10kV) to obtain a melt-blown elec...

Embodiment 3

[0049] Example 3: Polypropylene particles with a melt index MFI=1800 are added to an extruder for melt extrusion. The extrusion temperature is 250°C, and the melt temperature is 255°C. The wire box temperature is 255°C. Tourmaline powder is dispersed into a concentration of 1-10g / m by an aerosol generator 3 1. The aerosol with an average particle diameter of 0.1 μm is added to the drafting airflow duct, the temperature of the drafting air is 265 °C, and the tourmaline that enters the air gap of the melt blown component is blown out with the high-speed hot airflow on both sides of the spinning stream. The electret can be attached to the high temperature melt. The fine spinning stream is drawn and stretched by high-speed airflow to form an ultra-fine fiber shape. Gather into a network structure at a certain speed on the receiving device, with a weight of about 30g / m 2 . The fiber web is subjected to high-voltage electrostatic action (10kV) to obtain a melt-blown electret fil...

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Abstract

The invention discloses a melt-blown non-woven fabric electret adding device and adding method. The melt-blown non-woven fabric electret adding device comprises a spinneret plate and a receiving device, wherein a melt channel is formed in the spinneret plate, a triangular block is arranged on the spinneret plate, the bottom edge of the triangular block is fixedly connected with the spinneret plate, and a spinneret hole is formed in the triangular block and communicates with the melt channel; air knives are arranged on the left side and the right side of the triangular block and distributed ina bilateral symmetry mode with the spinneret orifice as the center, a drafting airflow channel is formed between the top of each air knife and the spinneret plate, one side of each air knife is closeto the triangular block, an air outlet is formed in the side close to the triangular block, and the other side of each air knife is far away from the triangular block; an air gap is formed between oneside close to the triangular block, of each air knife and the side of the triangular block; and one end of the drafting airflow channel communicates with the spinneret orifice through the air gap, anaerosol generator and a hot airflow device are arranged at the other end of the drafting airflow channel, the receiving device is located under the spinneret orifice and the air knives, and the spinneret plate is located over the air knives. The spinneret plate has the beneficial effect that the spinneret hole cannot be blocked.

Description

technical field [0001] The invention relates to the related technical field of meltblown nonwoven fabrics, in particular to an electret adding device and method for meltblown nonwoven fabrics. Background technique [0002] The melt-blown non-woven fabric is a polymer chip with a high melt index MFI, which is heated and melted by an extruder to become a fluid polymer high-temperature melt, and the melt is ejected from the spinneret hole to form a fine spinning stream. There are high-speed hot air flow on both sides to clamp the high-temperature melt stream, and form ultra-fine fiber form after traction and stretching. Gather into a network structure on the receiving device, and use the waste heat of the melt that has not been completely cooled to bond the fibers to each other into a non-woven form. [0003] Ordinary melt-blown non-woven fabrics have relatively high air resistance. In order to reduce air resistance, the industry adopts electret modification. This kind of mel...

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 Applications(China)
IPC IPC(8): D04H1/56D01D5/098D01D1/06
CPCD04H1/56D01D5/0985D01D1/065
Inventor 王猛马新宇王文涛
Owner ZHEJIANG CHENWEI ENVIRONMENTAL TECH CO LTD
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