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Compacted olefin fibers

a technology of olefin fibers and olefin fibers, which is applied in the field of olefin fibers, can solve the problems of criticality of the compaction temperature, especially for polyethylen

Inactive Publication Date: 2006-08-10
BTG INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The pre-compaction process of crosslinking has been found to increase the “temperature window” available for the subsequent compaction stage, and thus to make the compaction stage much easier to control. Further, compacted products produced by the process of the present invention have exhibited superior hot strength properties, compared with compacted products made from fibres which have not been subject to prior crosslinking.

Problems solved by technology

However, a drawback of this process is the criticality of the compaction temperature, especially for polyethylene.

Method used

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  • Compacted olefin fibers
  • Compacted olefin fibers
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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0067] The invention will now be further described, by way of example, with reference to the examples which follow.

[0068] Samples

[0069] In the first examples, the materials used were commercially available oriented melt spun homopolymeric polyethylene, sold as a 1800 denier multifilament yarn under the Trade Mark TENFOR, and as a 250 denier multifilament yarn, under the Trade Mark CERTRAN. The plolyethylene of TENFOR and CERTRAN is of the same grade, and is characterised as follows:

Tensile ModulusBreakingInitialMolecularWeightStrengthSecant2%MwMnProcessGPaGPaGPa130,00012,000melt spun1.35843

[0070] Pre-Treatment and Annealing

[0071] A bobbin of the TENFOR polyethylene was subjected to γ-radiation at a low dose rate (less than 0.1 MRad / hour) at ambient temperature under an atmosphere of acetylene at a pressure of about 5×104 Pa above atmospheric. The total dose was 7.39 MRad. After irradiation the sample was annealed for 2 hours at 110° C. under an atmosphere of acetylene at a pres...

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Abstract

A polyolefin plaque is made by hot compaction of an assembly of fibres of the oriented polymer. It has been found to be beneficial to subject the fibres to a prior crosslinking process. Hot compaction is then less temperature-sensitive and produces plaques with excellent hot strength properties. Preferably the fibres have been subjected to prior stages of irradiation and annealing, both in a non-oxidising environment, for example acetylene.

Description

[0001] This application is a continuation of application Ser. No. 10 / 717,553, filed Nov. 21, 2003, which is a continuation of application Ser. No. 09 / 971,710, filed Oct. 9, 2001, which is a divisional of application Ser. No. 09 / 285,256, filed Apr. 2, 1999, which is a continuation of PCT / GB97 / 02675, filed Oct. 6, 1997, the entire content of which is hereby incorporated by reference in this application.[0002] This invention relates to processes for the production of polymer sheet materials from oriented olefin polymer fibres and to the products of such processes. BACKGROUND OF THE INVENTION [0003] GB 2253420B describes a process whereby an assembly of fibres of an oriented polymer may be hot compacted to form a sheet having good mechanical properties. The process involves an initial processing step in which the fibres are brought to and held at the compaction temperature whilst subject to a pressure sufficient to maintain the fibres in contact, the contact pressure, and thereafter com...

Claims

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Application Information

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IPC IPC(8): B32B27/12B32B27/04B29C43/02B29C43/00B29K105/24D04H1/4291D04H1/44D04H1/54D04H1/554
CPCB29B13/08Y10T428/24826B29C2035/0827B29C2035/085B29C2035/0877B29C2071/022B29C2791/005B29K2023/06B29K2023/12B29K2105/06B29K2105/243B29K2105/25B29K2223/06D04H1/4291D04H1/44D04H1/54D04H1/554B29C43/006Y10T428/31855Y10T428/24994Y10T442/69Y10T428/249947Y10T428/249942
Inventor JONES, RICHARD ALBERTWARD, IAN MACMILLANHINE, PETER JOHNBONNER, MARK JAMES
Owner BTG INT LTD