PROCESS FOR SPINNING UHMWPE UHMWPE MULTIFILAMENT YARNS PRODUCED THEREOF AND PRODUCTS COMPRISING SAID YARNS

摘要

The present invention relates to a gel-spinning process for producing high tensile strength ultra high molecular weight polyethylene (UHMWPE) multifilament yarns comprising ultra-low dtex filaments, said method comprising the steps of spinning a UHMWPE solution through a spinneret into an air gap And the following draw ratio DR _fluid applied to the obtained fluid filament is 450 or more: DR _fluid = DR _{spin hole} x DR _{air gap} And wherein, DR DR _{spin hole} and _{the air gap} is the stretch ratio in each of the spin hole and the air gap, _eogaepthe DR is at least 30. The UHMWPE multifilament yarn thus produced has a tensile strength of 3.5 GPa or more and a filament having a dtex of 0.5 or less. The present invention also relates to articles comprising such yarns, such as fabrics, medical devices, composite articles and ballistic resistant articles.