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Method of producing fine amorphous polymer fibres, fine amorphous polymer|fibres, and spinneret for producing such fibres

An amorphous, spinneret technology, applied in the field of fiber systems, can solve problems such as limitations

Inactive Publication Date: 2015-03-25
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional processing schemes are not suitable for converting certain amorphous engineering thermoplastic compositions, such as polyetherimide (PEI) pellets, into fine denier fibers, because traditional methods lead to limitations on how fine fibers can be achieved. limit

Method used

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  • Method of producing fine amorphous polymer fibres, fine amorphous polymer|fibres, and spinneret for producing such fibres
  • Method of producing fine amorphous polymer fibres, fine amorphous polymer|fibres, and spinneret for producing such fibres
  • Method of producing fine amorphous polymer fibres, fine amorphous polymer|fibres, and spinneret for producing such fibres

Examples

Experimental program
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Effect test

Embodiment approach

[0081] According to one embodiment, the spinneret can be run at reduced pressure compared to the same spinneret comprising a distribution plate. According to various embodiments, the operating pressure of a spinneret without a distribution plate may be reduced by a certain percentage relative to the same spinneret including a distribution plate. The percentage can be within a range with a lower limit and / or an upper limit. Ranges may or may not include lower and / or upper limits. The lower limit and / or upper limit may be selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 and 60%. For example, according to certain preferred embodiments, the operating pressure of a spinneret without a distribution plate may be reduced by a percentage of at least 40% relative to the same spinneret including a...

other Embodiment approach

[0083] Other embodiments relate to amorphous polymer fibers. Fibers can be drawn, but even in the undrawn state, fibers can have excellent properties.

[0084] According to various embodiments, the undrawn amorphous polymer fibers may have a denier within a range having a lower limit and / or an upper limit. Ranges may or may not include lower and / or upper limits. The lower limit and / or upper limit can be selected from 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2 , 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, and 3. For example, according to certain preferred embodiments, the undrawn amorphous polymer fibers may have a denier of less than 2.5.

[0085] According to various embodiments, the undrawn amorphous polymer fibers may have a shrinkage within a range having a lower limit and / or an upper limit. Ranges may or may not include lower and / or upper limits. The lower limit and / or upper limit may be selected from 0, 0.1, 0....

Embodiment 1

[0130] The purpose of this example was to make PEI fibers according to our invention. Fibers were fabricated according to the procedure described above, except using a 1 1 / 4 inch extruder and beta module design. A 0.6 mm capillary spinneret with 4 L / D was used, and a 325 mesh screen pack filter was used.

[0131]The fibers produced had a dpf of 2 and a shrinkage of less than 2%. Unexpectedly, after initial receipt, the fibers exhibit a combination of low denier and low shrinkage when produced directly from the spinneret without the need to stretch or anneal the fibers. It is possible to fabricate fibers at speeds ranging from 1500 m / min to 2250 m / min for at least 2 hours without damage. This example advantageously demonstrates that low denier fibers can be made from polyetherimides having a molecular weight distribution of at least 2.5.

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Abstract

A method, including extruding a melt including an amorphous polymer composition through a spinneret under a pressure from 400 to 1500 psi to produce a spun fiber; collecting the spun fiber on a feeding roll without drawing the spun fiber; producing a solidified fiber from the spun fiber. The solidified fiber can have a dpf of from greater than 0 to 2.5 dpf, and a shrinkage less than or equal to 2%. The method can also include collecting the solidified fiber onto a spool without subjecting the solidified fiber to a drawing step. A spinneret for producing fibers of at most 2.5 dpf from a composition comprises an amorphous polyetherimide, the spinneret comprising a die having a plurality of round melt channels but no distribution plates. Fibers produced by the method and from the spinneret are also disclosed.

Description

technical field [0001] The present invention relates generally to fibers and systems, methods and apparatus for producing fibers. More particularly, the present invention relates to fine denier amorphous polymer fibers (such as fine denier polyetherimide fibers), and the use of polymers by melt spinning polymers without drawing off the spun fibers. Systems, methods and apparatus for producing such fibers. Background technique [0002] Synthetic fibers have been produced for many years using well-established methods and processing equipment optimized for the melt and physical properties of semi-crystalline materials, namely low melt viscosity, excellent thermal stability and crystallinity. Traditionally, synthetic fibers have been produced using semi-crystalline materials that have very low viscosity in the molten state and require processing methods or die design methods to produce a melt that is uniform across the spinneret hole pattern distributed. The spinneret is desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/09D01D4/06D01D5/084D01D5/098D01F6/74
CPCD01D1/09D01D4/06D01D5/084D01D5/098D01F6/74Y10T428/298D01D4/025D02G3/02D10B2331/14D01D5/08
Inventor 理查德·彼得斯戴维·沃伦迈克尔·林赛
Owner SHPP GLOBAL TECH BV
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