Nonwoven electret fiber web and its preparation method

A technology of electret and fiber web, which is applied in the direction of non-woven fabrics, textiles and papermaking, chemical instruments and methods, etc., can solve the problems of ineffective elimination of odor, reduction, limited effectiveness of airborne particles, etc.

Inactive Publication Date: 2016-09-28
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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  • Nonwoven electret fiber web and its preparation method
  • Nonwoven electret fiber web and its preparation method
  • Nonwoven electret fiber web and its preparation method

Examples

Experimental program
Comparison scheme
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example

[0252] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0253] Material

[0254] The raw materials used in the following Preparation Examples, Examples and Comparative Examples are all commercially available, as detailed in Table A below.

[0255] Table A

[0256]

[0257]

[0258]

[0259]

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

example A1

[0277] Nonwoven electret webs were prepared from 0.5 kg of electret fibers and 9.5 kg of photocatalytic fibers according to the processing procedure described below.

[0278] 1. First, the electret fibers and photocatalytic fibers are uniformly mixed, and then coarse opening and fine opening are performed respectively, wherein each opening roller has a frequency of 50 Hz in order to make the fiber blocks into fine fiber bundles. In addition, the impurities in the raw materials are filtered out.

[0279] 2. Then, the fiber bundle is sent to the carding machine via the feed box to card the fiber bundle into a single fiber arrangement state. The carded fibers were then output through a doffer to form a substantially uniform nonwoven electret web having a basis weight of 10 gsm.

[0280] 3. When the nonwoven electret fiber web is introduced into the cross-lapper, the number of laying layers is controlled by the speed of the cross-lapper and the conveyor belt to achieve the requir...

example A2

[0284] Nonwoven electret webs were prepared from 5 kg of electret fibers and 5 kg of photocatalytic fibers according to the processing procedure described below.

[0285] 1. First, the electret fibers and photocatalytic fibers are uniformly mixed, and then coarse opening and fine opening are performed respectively, wherein each opening roller has a frequency of 50 Hz in order to make the fiber blocks into fine fiber bundles. 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 is made into a random state by processing the fiber bundle with a licker-in roller under the action of air flow. The output was a uniform nonwoven electret web having a basis weight of 90 gsm.

[0287] 3. Next, the laminated nonwoven electret web was subjected to needling at a needling frequency of 350 times / minute in order to increase the strength of the nonwoven electret web....

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Abstract

The invention discloses a non-woven electret fiber web for electrostatic adsorption and odor elimination and a preparation method thereof. In certain exemplary embodiments, the nonwoven electret web comprises: a plurality of electret fibers; at least one of a plurality of photocatalytic fibers or a plurality of multicomponent fibers; and optionally, At least one of a plurality of chemically active particles, a plurality of carbon-based fibers, or a plurality of monocomponent thermoplastic fibers. In other exemplary embodiments, the present invention discloses a carding and cross-folding or air-laying process for making a nonwoven web comprising: electret fibers; and photocatalytic fibers, One or more of chemically active particles, multicomponent fibers, monocomponent thermoplastic fibers, or carbon-based fibers. In some exemplary embodiments, the exemplary nonwoven electret webs of the present disclosure exhibit excellent air permeability properties, high adsorption properties for airborne pollutants, and odor elimination functions.

Description

technical field [0001] The present invention relates to a nonwoven electret web comprising electret fibers and one or both of fibers having photocatalytically active and chemically active particles. More specifically, the present invention describes nonwoven electret fiber webs that can be used as air filtration materials, for example, as air for heating, ventilation, and cooling (HVAC) equipment. Filters, cabin air filters for vehicles, respirators, etc. Background technique [0002] Air quality is vital to life, and many companies are researching filter materials for removing airborne pollutants such as particles and volatile organic compounds (VOCs) with high efficiency and low airflow resistance. The development of fibrous air filtration materials has recently focused on the use of ultra-fine fibers (such as nanofibers) or charged fibers to trap pollutants present in the air stream. The use of nanofibers often results in a relatively large pressure drop or resistance t...

Claims

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Application Information

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Patent Type & Authority Patents(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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