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A kind of preparation method of composite nonwoven air filter material

An air filter material and non-woven technology, which is applied in the field of air filter material preparation, can solve the problems such as the improvement of filtration efficiency cannot reach an ideal level, the reduction of the effective resistance ratio of filtration quality, and the large increase of filtration resistance, etc. The effect of reducing energy consumption, reducing the number of composite layers, and reducing production costs

Active Publication Date: 2022-04-12
ZHEJIANG IND POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing composite technology is the simple lamination and hot rolling reinforcement of two kinds of nonwoven fabrics, and the improvement of filtration efficiency still cannot reach the ideal level. Higher filtration efficiency can only be obtained through multi-layer composite and reinforcement, but at the same time The increase in filtration resistance is greater, resulting in a decrease in filtration quality, that is, an effective resistance ratio, and an increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The invention provides a kind of preparation method of composite nonwoven fabric air filter material, comprises the following steps:

[0024] (1) After the dried spunbond polypropylene polymer is melted and pressurized by the screw extruder, it is then sprayed out from the spinneret assembly to form a certain fineness of spunbond filaments, and the spunbond filaments are cooled by air A spunbond nonwoven web is formed on a web-forming curtain.

[0025] Specifically: select spun-bonded polypropylene polymer slices with a melting point of 162°C and a melt index of 30g / 10min; The sticky polypropylene polymer slices are transported to the screw extruder for melting treatment. The melting temperatures of zones 1 to 5 in the screw extruder are 200, 210, 220, 220, and 220°C respectively, and the melt after melting treatment passes through the filter screen After filtering, it enters the metering pump for metering. The frequency of the metering pump is 20-30Hz. The metered mel...

Embodiment 1

[0035] Manufacturing of spunbonded nonwoven web: select spunbonded polypropylene slices with a melting point of 162°C and a melt index of 30g / 10min; the spunbonded polypropylene is transported by airflow to the slicing hopper, then enters the vacuum drying area for drying, and then the dried slices are Transport to the screw extruder for melting treatment, and the melting temperatures of zones 1 to 5 in the screw extruder are respectively 200, 210, 220, 220, and 220°C. The melt is filtered through the filter screen and then enters the metering pump for metering. The frequency of the metering pump is 20Hz. The metered melt is input into the spinning assembly for spinning, and then the spun fiber melt is transported to the quenching zone, cooled and consolidated into filaments by side blowing at 15-17°C, and the side blowing frequency is 28Hz . The cooled and consolidated fiber bundles are input to the pulling nozzle, pulled by the compressed air at high speed, and then evenly ...

Embodiment 2

[0040] Manufacture of spunbonded nonwoven fiber web: select spunbonded polypropylene chips with a melting point of 162°C and a melt index of 30g / 10min; The finished slices are transported to the screw extruder for melting treatment, and the melting temperatures in zones 1 to 5 are 200, 210, 220, 220, and 220°C, respectively. The melt is filtered through the filter screen and then enters the metering pump for metering. The frequency of the metering pump is 24Hz. The metered melt is input into the spinning assembly for spinning, and then the spun fiber melt is transported to the quenching zone, cooled and consolidated into filaments by side blowing at 15-17°C, and the side blowing frequency is 28Hz . The cooled and consolidated fiber bundles are input to the pulling nozzle, pulled by compressed air at high speed, and then evenly fall on the conveying mesh curtain, and laid into a spunbonded nonwoven fiber web. The frequency of the mesh curtain is selected as 9Hz.

[0041] Manu...

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Abstract

The invention discloses a method for preparing a composite nonwoven fabric air filter material, which belongs to the field of material manufacturing. The preparation method of the invention includes the following steps: (1) melting the dried spunbonded polypropylene polymer through a screw extruder After pressurized, it is sprayed out from the spinneret assembly to form spunbonded filaments of a certain fineness, and the spunbonded filaments are cooled by air to form a spunbonded nonwoven web on the web forming curtain. (2) Melt the dried melt-blown polypropylene polymer through a screw extruder, and then blow it with high-speed and high-temperature airflow to make the melt stream extremely stretched to form melt-blown short fibers, which are collected into A web of meltblown staple fibers is formed on a web forming curtain or web forming drum. (3) Hot-rolling the melt-blown short fiber web prepared in step (2) to obtain a hot-rolled melt-blown nonwoven web. (4) The spun-bonded nonwoven web obtained in step (1) and the hot-rolled melt-blown nonwoven web obtained in step (3) are subjected to a needling process to obtain a laminated composite nonwoven fabric.

Description

【Technical field】 [0001] The invention relates to a preparation method of an air filter material. 【Background technique】 [0002] The rapid development of modern industry and transportation makes air pollution very serious. The composition of inhalable particulate matter in the air is very complex, with a small particle size and a wide distribution range. Particles with a particle size of less than 2.5um can enter the alveoli, which not only stimulates the human respiratory system, but also can carry bacteria, viruses and carcinogens. Therefore, the development of high-efficiency air filter materials has been paid more and more attention. [0003] At present, the main high-efficiency air filtration materials include electret meltblown nonwovens, electrospun nanofiber membranes and porous membrane materials. However, electret meltblown nonwovens have the disadvantages of easy loss of static charge; the production efficiency of electrospun nanofiber membranes is very low; an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/02B32B27/12B32B27/32D04H5/08D04H5/06D01D5/08B01D39/16
Inventor 金关秀全琼瑛祝成炎
Owner ZHEJIANG IND POLYTECHNIC COLLEGE
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