- Patent Title: Process for making high-performance polyethylene multifilament yarn
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Application No.: US16354021Application Date: 2019-03-14
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Publication No.: US10557690B2Publication Date: 2020-02-11
- Inventor: Joseph Arnold Paul Maria Simmelink , Jacobus Johannes Mencke , Martinus Johannes Nicolaas Jacobs , Roeloef Marissen
- Applicant: DSM IP ASSETS B.V.
- Applicant Address: NL Heerlen
- Assignee: DSM IP ASSETS B.V.
- Current Assignee: DSM IP ASSETS B.V.
- Current Assignee Address: NL Heerlen
- Agency: Nixon & Vanderhye P.C.
- Priority: WOPCT/NL2004/00029 20040101
- Main IPC: F41H5/04
- IPC: F41H5/04 ; A61L17/04 ; A61L27/16 ; D01D4/02 ; D01F6/04 ; D02G3/02 ; D01D5/18 ; C08F10/02 ; C08L23/06 ; C08L53/02 ; D07B1/02

Abstract:
Processes for making high-performance polyethylene multi-filament yarn are disclosed which include the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DRfluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DRsolid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Dn with Ln/Dn of from 0 to at most 25, to result in a draw ratio DRfluid=DRsp*DRag of at least 150, wherein DRsp is the draw ratio in the spinholes and DRag is the draw ratio in the air-gap, with DRsp being greater than 1 and DRag at least 1. High-performance polyethylene multifilament yarn, and semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites, are also disclosed.
Public/Granted literature
- US20190212100A1 PROCESS FOR MAKING HIGH-PERFORMANCE POLYETHYLENE MULTIFILAMENT YARN Public/Granted day:2019-07-11
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