Fremgangsmåde til fremstilling af multifilamentgarn af polyethylen med høj ydeevne

摘要

The invention relates to a process for making high-performance polyethylene multi-filament yarn comprising the steps of making a solution of ultra-high molar mass polyethylene in a solvent; spinning of the solution through a spinplate containing a plurality of spinholes into an air-gap to form fluid filaments, while applying a draw ratio DR_fluid; cooling the fluid filaments to form solvent-containing gel filaments; removing at least partly the solvent from the filaments; and drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DR_solid, wherein in a draw ratio DR_fluid=DR_spxDR_ag of at least 50 is applied, wherein DR_sp is the draw ratio in the spinholes and DR_ag is the draw ratio in the air-gap, with DR_sp greater than 1 and DR_ag at least 1. The invention further relates to a spinplate having spinholes of specific geometry.