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Charged filter medium and method for manufacturing charged filter medium

A technology of filter material and charged layer, applied in the field of charged filter material, which can solve the problems of decreased collection efficiency and increased pressure loss, etc.

Inactive Publication Date: 2019-11-08
NIPPON BAIRIIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the pressure loss and the collection efficiency are generally in an irreconcilable relationship, in order to improve the collection efficiency and reduce the fiber diameter of the filter material, the pressure loss tends to increase. When the basis weight (weight per unit area, the same below) of the filter material is reduced, the collection efficiency tends to decrease

Method used

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  • Charged filter medium and method for manufacturing charged filter medium
  • Charged filter medium and method for manufacturing charged filter medium
  • Charged filter medium and method for manufacturing charged filter medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] (Preparation method of fine fiber fabric)

[0153] Relative to the volume resistivity value of 10 16 (Ω·cm) about 100 parts by mass of a commercially available polypropylene resin, mixed with 4 parts by mass of a commercially available hindered amine light stabilizer as a charging aid, and spun by a melt-blowing method to prepare a melt having the following composition: Spray non-woven fabric.

[0154] Resin constituting the fiber: Polypropylene resin

[0155] Fiber cross section shape: round

[0156] Median fiber diameter: 1.44 μm

[0157] Basis weight: 7g / m 2

[0158] Thickness: 0.07mm

[0159] Pressure loss when the wind speed is 10cm / s: 12.5Pa

[0160] In addition, the pressure loss (Pa) of a meltblown nonwoven fabric was calculated|required by providing a meltblown nonwoven fabric with the calculation method demonstrated in the item (calculation method of pressure loss and collection efficiency).

[0161] (Preparation method of support fabric)

[0162] A s...

Embodiment 2～6、 comparative example 1～6

[0188] A charged filter material was produced in the same manner as in Example 1 except that the basis weight and median fiber diameter of the melt-blown nonwoven fabric used in the preparation of the charged filter material were changed.

[0189] In addition, each of the prepared charged filter materials has a configuration in which a thin fiber layer derived from a melt-blown nonwoven fabric and a support fiber layer derived from a spunbonded nonwoven fabric are laminated and integrated.

[0190] Tables 1 to 4 summarize the configurations and measurement results of the charged filter materials of Examples and Comparative Examples prepared as described above.

[0191] In addition, when there are cracks on the main surface of the meltblown nonwoven fabric alone or the charged filter material (charged laminate), the length on the main surface of the fabric cannot be measured, so the elongation (%) cannot be calculated. . When the elongation (%) could not be calculated, it was ...

Embodiment 7

[0201] A charged filter material was prepared in the same manner as in Example 2 except that a melt-blown nonwoven fabric was prepared using only a polypropylene resin without mixing a charging auxiliary agent.

[0202] In addition, the prepared charged filter material has a structure in which a thin fiber layer derived from a meltblown nonwoven fabric and a supporting fiber layer derived from a spunbonded nonwoven fabric are laminated and integrated.

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Abstract

The purpose of the present invention is to provide a charged filter medium having superior filtration performance and a method for manufacturing a charged filter medium. The present invention is a charged filter medium having both superior pressure loss and collection efficiency in excellent balance such that the pressure loss is 24 Pa or less with an air flow of 10 cm / s and the collection efficiency for particles with a particle size of 0.3 - 0.5 [mu]m at an air flow of 10 cm / s is 76% or greater, even being a charged filter medium provided with a fine fiber layer with a median fiber diameterfor constituent fibers smaller than 2.1 [mu]m and a mesh smaller than 10 g / m2 and a charged laminate wherein a support fiber layer is integrated by lamination. In addition, a method for manufacturingthe charged filter medium has a step for preparing a laminate by integration of a fine fiber fabric and a support fabric by lamination, thereby being able to provide the same to a polarized fluid charging method in a state where the fine fiber fabric is reinforced by the support fabric. As a result, it is possible to manufacture a charged filter medium having both superior pressure loss and collection efficiency in excellent balance.

Description

Technical field [0001] The invention relates to a charged filter material and a method for manufacturing the charged filter material. Background technique [0002] Among conventional filter materials, there is a demand for a material that has high collection efficiency of particles (for example, particles contained in the atmosphere or particles discharged from OA equipment such as printers) and has low pressure loss. However, since pressure loss and collection efficiency are generally in an incompatible relationship, when the diameter of the constituent fibers of the filter material is reduced in order to improve the collection efficiency, the pressure loss tends to increase. In order to reduce the pressure loss, the pressure loss tends to increase. When the basis weight (weight per unit area, the same applies below) of the filter material is lowered or reduced, the collection efficiency tends to decrease. [0003] Therefore, a filter material with an excellent balance bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16B03C3/28B32B5/02D04H1/4382D04H3/016
CPCB01D39/1623B01D2239/0435B01D2239/0681B01D2239/1233D04H3/016B01D2239/0654B01D2239/1241D04H1/43838B32B5/022B01D2239/0622B01D2239/10B32B2262/0253B32B5/265B32B5/26
Inventor 石桥达朗田中广志
Owner NIPPON BAIRIIN
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