PROCESS FOR SPINNING UHMWPE, UHMWPE MULTIFILAMENT YARNS PRODUCED THEREOF AND THEIR USE

摘要

Gel-spinning processes for producing a high tensile strength ultra high molecular weight polyethylene (UHMWPE) multifilament yarn comprising ultra-low dtex filaments, include applying a draw ratio DRfluid to fluid filaments obtained by spinning a solution of UHMWPE through a spinneret and into an air gap, is at least 450, wherein DRfluid=DRsp×DRag, the DRsp and DRag being the draw ratios in the spinholes and in the air gap, respectively; and provided that DRag is at least 30. The UHMWPE multifilament yarns produced thereof were characterized by a tensile strength of at least 3.5 GPa and contained filaments having a dtex of at most 0.5. The invention further relates to products comprising said yarns, e.g. fabrics, medical devices and composite and ballistic articles.

主权项

1. An ultra high molecular weight polyethylene (UHMWPE) multifilament yarn, wherein the UHMWPE has an intrinsic viscosity as measured on solution in decalin at 135° C. of at least 3 dl/g and at most 40 dl/g, and the yarn has a tensile strength of 3.5-5.5 GPa and comprises filaments of 0.06-0.5 dtex.