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Non-woven electret fibrous webs and methods of making same

A technology of electret and fiber net, applied in non-woven fabrics, textiles and papermaking, chemical instruments and methods, etc., can solve problems such as adverse effects, inability to effectively eliminate odors, and limited adsorption capacity

Inactive Publication Date: 2014-05-07
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of nanofibers often results in a relatively large pressure drop or resistance to air flow, which may have adverse effects in some air filtration applications
On the other hand, the adsorption capacity of charged fibers is limited by the amount of such fibers in the web, and the effectiveness of charged fibers in adsorbing airborne particles is limited and decreases over time as these materials reach their charge saturation limit
Furthermore, such fibers alone are often not effective in eliminating odors due to (for example) the presence of VOCs such as formaldehyde

Method used

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  • Non-woven electret fibrous webs and methods of making same
  • Non-woven electret fibrous webs and methods of making same
  • Non-woven electret fibrous webs and methods of making same

Examples

Experimental program
Comparison scheme
Effect test

example

[0252] Although the numerical ranges and parameters showing the broad scope of the present invention are approximate values, the numerical values ​​listed in the specific embodiments are recorded as accurately as possible. However, any numerical value inherently contains certain errors, which are inevitably caused by the standard deviations existing in their respective test measurements. At a minimum, each numerical parameter is not intended to limit the application of the principle of equivalence in the scope of protection of the claims. At least, each numerical parameter should be interpreted according to the effective digits of the reported value and through the usual rounding method.

[0253] material

[0254] The raw materials used in the following preparation examples, examples and comparative examples are all commercially available, as described in detail in Table A below.

[0255] Table A

[0256]

[0257]

[0258]

[0259]

[0260] The following fibers are exemplary filler...

example A1

[0277] According to the processing procedure described below, a non-woven electret fiber web was prepared from 0.5 kg of electret fibers and 9.5 kg of photocatalytic fibers.

[0278] 1. First, the electret fiber and the photocatalytic fiber are uniformly mixed, and then coarse opening and fine opening are performed respectively, wherein each opening roll has a frequency of 50 Hz so that the fiber mass becomes a fine fiber bundle. In addition, the impurities in the raw materials are filtered out.

[0279] 2. Then, the fiber bundle is sent to the carding machine through the feed box to card the fiber bundle into a single fiber arrangement state. Next, the carded fibers were output through a doffing machine to form a substantially uniform non-woven electret fiber web with a basis weight of 10 gsm.

[0280] 3. When the non-woven electret fiber web is introduced into the cross-laid machine, the number of layers is controlled by the speed of the cross-laid machine and the conveyor belt to...

example A2

[0284] According to the processing procedure described below, a non-woven electret fiber web was prepared from 5 kg of electret fibers and 5 kg of photocatalytic fibers.

[0285] 1. First, the electret fiber and the photocatalytic fiber are uniformly mixed, and then coarse opening and fine opening are performed respectively, wherein each opening roll has a frequency of 50 Hz, so that the fiber block becomes a fine fiber bundle. In addition, the impurities in the raw materials are filtered out.

[0286] 2. Then, the fiber bundle is sent to the Rando air-laid machine through the feed box, and the fiber bundle becomes random by processing the fiber bundle with a licker roller under the action of air flow. Output a uniform non-woven electret fiber web with a basis weight of 90gsm.

[0287] 3. Next, the laminated non-woven electret fiber web is subjected to a needle punching method with a needle punching frequency of 350 times / min to increase the strength of the non-woven electret fiber ...

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Abstract

A non-woven electret fibrous web for electrostatic adsorption and odor elimination and the preparation process thereof. In certain exemplary embodiments, the non-woven electret fibrous web includes a multiplicity of electret fibers, at least one of a plurality of photo-catalytic fibers or a plurality of multi-component fibers; and optionally, at least one of a plurality of chemically-active particulates, a plurality of carbon-based fibers, or a plurality of mono-component thermoplastic fibers. In other exemplary embodiments, carding and cross-lapping or air-laying processes are disclosed for making nonwoven fibrous webs including electret fibers and one or more of photocatalytic fibers, chemically-active particulates, multi-component fibers, mono-component thermoplastic fibers, or carbon-based fibers. In some exemplary embodiments, exemplary non-woven electret fibrous webs of the disclosure exhibit superior gas permeation characteristics, high adsorption characteristics for airborne contaminants, as well as an odor elimination function.

Description

Technical field [0001] The present invention relates to a non-woven electret fiber web comprising one or both of electret fibers and fibers having photocatalytic activity and chemically active particles. More specifically, the present invention describes a non-woven electret fiber web that can be used as an air filter material, for example, as air for heating, ventilation, and cooling (HVAC) equipment Filters, cabin air filters, respirators, etc. for vehicles. Background technique [0002] Air quality is critical to life, and many companies are studying filter materials for removing airborne pollutants such as particles and volatile organic compounds (VOC) with high efficiency and low air flow resistance. The development of fibrous air filter materials has recently focused on the use of ultrafine fibers (such as nanofibers) or charged fibers to trap pollutants present in the air stream. The use of nanofibers usually results in a relatively large pressure drop or air flow resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/413D04H1/72D04H1/732D04H1/46D04H1/54
CPCB03C3/155B03C3/30B03C3/47B03C3/34
Inventor 付小栓陈锐许强让·勒诺尔芒亨德里克·搏特吴天纵安德鲁·R·福克斯
Owner 3M INNOVATIVE PROPERTIES CO
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