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Needlepunched nanoweb structures

A technology of nanofiber web and fiber web, which is applied in the field of nanofiber web, and can solve the problems of different sheet materials, such as performance and difference

Inactive Publication Date: 2010-03-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the material is rewound after unwinding, the varying tension can result in different widths and potentially resulting differences in sheet properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A solution of polyamide-6,6 in 24% formic acid was spun into a nanofibrous web using the electroblowing method described in WO 03 / 080905. Its number average fiber diameter was about 422 nanometers. The nanoweb had a nominal basis weight of 28.5 grams per square meter (gsm) and a thickness of 60 microns.

[0028] Four plies were hand-knitted with 80% of the needles per square inch A backing material made of fibers and 20% polyester fibers was knitted onto a web of polyamide nanofibers, the backing material having a basis weight of approximately 2 ounces per square yard. The needles in the loom were 38 gauge (0.5 mm diameter), approximately 1185 times the average fiber diameter of the nanoweb. The pore structure was then measured with a standard capillary flow porosometer manufactured by PMI (Porous Materials Incorporated).

[0029] For the optional calendering operation, the hand sheet laminate samples were transferred into the nip of a twin steel roll calender. The...

Embodiment 2

[0035] Using the method of World Patent Publication WO 03 / 080905, polyester spunlace at 33.9 gsm ( Du Pont, Wilmington, DE) spun polyamide-6,6 into nanofibrous webs with a basis weight of 10 gsm. The average fiber diameter is 400 nm. The nanofiber web was needle punched to 14 oz. polyester partially reinforced felt (Southern Felt).

[0036] To perform needling, a felt and scrim + nanoweb structure is brought together, with the nanoweb placed on the inside, next to the felt, and then needling is performed from one side of the felt. The line speed was 1.5 m / min. The punctures per inch (PPI) was 383. The laminate had an air permeability of 32 cubic feet per minute (cfm).

Embodiment 3

[0038] Polyester spunlace at 33.9 gsm using the method of World Patent Publication WO 03 / 080905 Above polyamide-6,6 was spun into a nanofiber web with a basis weight of 5 gsm. The average fiber diameter is 400 nm. The nanofiber web was needle punched to 14 oz. polyester partially reinforced felt (Southern Felt).

[0039] To perform needling, a felt and scrim + nanoweb structure is brought together, with the nanoweb placed on the inside, next to the felt, and then needling is performed from one side of the felt. The line speed was 1.5 m / min. The punctures per inch (PPI) was 383. The laminate had an air permeability of 37 cubic feet per minute (cfm).

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Abstract

The invention discloses a composite sheet of a nanoweb bonded to a second web, such that fibers from the second web protrude through the nanoweb in a multiplicity of discontinuous regions.

Description

field of invention [0001] The present invention relates to the field of nanoweb structures, and in particular, to nanowebs bonded to substrates by needling. Background of the invention [0002] A "nanofibre web" is a nonwoven fiber consisting essentially, or even entirely, of fibers having a number average diameter of less than 1 micron. Due to its extremely small pore size and large surface area / volume ratio, nanofibrous webs are expected to be used as substrates in several applications, such as high temperature gas filtration, high-efficiency air filtration, wastewater filtration, membranes for filtering biological pollutants , battery separators and other energy storage devices. However, one disadvantage of nanofibrous webs for these applications is their poor mechanical integrity. [0003] The number average diameter of the nanofibers is less than 1000 nanometers, sometimes as small as 20 nanometers. In this dimension, even when nanofibers are laminated into thick fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/46
CPCD04H13/007D04H13/005B01D39/163B32B5/26B01D39/1623B01D2239/025B01D2239/0659D04H1/4374D04H1/498Y10T442/608D04H13/00D04H1/485B82Y40/00
Inventor G·E·西蒙兹A·科利
Owner EI DU PONT DE NEMOURS & CO
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