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Fiber bundle

A fiber bundle, fiber technology, applied in the field of fiber bundles, which can solve the problems of large chamber size, reduced melt strength, fiber breakage, etc.

Inactive Publication Date: 2017-08-01
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, typical foaming methods yield large cell sizes, such as greater than 100 μm
This reduces the melt strength, thereby causing fiber breakage during spinning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0155] Bicomponent fibers were formed comprising a core and a sheath, the core being composed of 93 wt.% isotactic polypropylene (M3661, with a melt flow rate of 14 g / 10 min at 230°C and a melting temperature of 150°C, Total Petrochemicals) and 7wt.% of A blend of AX8900 (Arkema) formed with 100 wt.% ASPUN skin TM 6835A (LLDPE from Dow Chemical) was formed. The core accounts for 70vol.% of the fiber and the sheath accounts for 30vol.%. A bundle containing 288 fibers was formed. The total titer of the fiber bundle was about 11 kilograms per 9000 meters. The bobbin containing the precursor fiber bundle was unwound across the end to provide a slight twist of about 1 to 2 turns / meter to the bundle. The fiber bundle was taken up at a speed of 14 meters per minute using a set of 5 rollers (quintuple rollers). The fiber bundle was then immersed in a water bath (40° C.) in which the fiber bundle was drawn with two pins positioned perpendicular to the direction of fiber progress...

example 2

[0157]The tow was drawn as described in Example 1, but the bobbins were unwound using an unwind creel that did not provide twist. The take-up fivefold roll speed was 4 meters per minute and the final two sets of fivefold rolls were at a speed of 24 meters per second to give a draft ratio of 6. The water bath was set at 44°C.

example 3

[0159] The fiber tows were drawn as described in Example 1, but the fiber tows were drawn through a godet based drawing unit. The fiber bundle was unwound over the end to provide a slight twist to the fibers, as described in Example 1. The feed roll speed was 48 m / min, the first draft roll speed was 50 m / min, the second draft roll speed was 100 m / min, the third and fourth draft roll speeds were 250 m / min, and The relaxation roll speed was 245 meters per minute. The resulting draw ratio was 5.2. The temperature of the first, second, third and fourth drawing rolls was set at 40°C.

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Abstract

A fiber bundle containing a plurality of fibers that are twisted about a longitudinal axis is provided. At least a portion of the fibers are formed from a thermoplastic composition containing a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains. A porous network is defined in the composition that includes a plurality of nanopores.

Description

Background technique [0001] Significant efforts have been made to produce low-density polyolefin fibers to improve the use of natural resources and reduce carbon emissions in finished products. A typical method of producing low density polyolefin fibers is to expand the polymer using physical or chemical blowing agents that create air cells through the bulk. Chemical blowing agents are compounds that undergo a chemical reaction that releases a gas that passes through the polymer body to create a cell structure. Physical blowing agents are usually compressed gases dispersed in the polymer and expanded to create cells. Regardless, typical foaming methods result in low molecular orientation because cell formation occurs while the polymer is in the molten state. This prevents the polymer from strain hardening, which typically occurs at temperatures well above the polymer's melting temperature or glass transition temperature, resulting in a product with low mechanical strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/06D01F1/10D04H1/4291A61F13/15A61F13/49
CPCA61F13/15A61F13/49D01F1/10D01F8/06D04H1/4291A61F13/02A61F13/472A61F13/51458A61F2013/15447A61F2013/16A61F2013/51026D01D4/02D01D5/098D04H3/007D04H3/011D04H3/16
Inventor V·A·托波尔卡雷夫R·J·麦克尼尼N·T·肖勒A·J·卡里洛
Owner KIMBERLY-CLARK WORLDWIDE INC