Production technology of high-tenacity polyester yarns based on melt spinning method

Abstract

The invention discloses a production technology of high-tenacity polyester yarns based on a melt spinning method. The technology comprises the steps of polymer melting extrusion, melt filtration, liquid phase adhesion promotion, extrusion through spinneret holes and trickle formation, cross air blow cooling, spinning silk silver oiling and winding and forming. On the basis of a traditional melt spinning technology, an automatic residue discharging filtering device and a liquid phase adhesion promotion device are additionally arranged, the automatic residue discharging filtering device is horizontally connected with a threaded rod extruder in a screwed mode through a bolt, the melt is subjected to rough filtration through a first buffer screen net and a second buffer screen net in sequence, and then a pure melt is obtained by filtration with a filter net; filter residue is taken out with continuous discharging of an extrusion machine. Two identical liquid phase adhesion promotion kettles are arranged below the filtering device, and the melt viscosity is increased from 0.53 dl / g-0.66 dl / g to 0.98 dl / g-1.21 dl / g. According to the obtained high-tenacity polyester yarn finished threads, the density is 866 dtex, the strength is 6.6 cN / dtex-8.5 cN / dtex, the elastic modulus is 97-146 cN / dtex, the variation coefficient is smaller than 3.2%, the strength is high, the elasticity is good, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of spinning, in particular to a process for producing polyester high-strength yarn based on a melt spinning method. Background technique [0002] Polyester high-strength yarn has the characteristics of high strength, good wear resistance, and good elasticity. It is a special variety of polyester industrial yarn. At present, the production route of polyester industrial yarn is mainly used at home and abroad, and medium and high-strength polyester filaments with a strength of about 6.0cN / dtex can be spun. The main process includes: melting and extruding the polymer in a screw press, but not The quality of the filtered melt is unstable during extrusion and spinning, and the spinneret is seriously damaged, resulting in an increase in production costs. The viscosity of the extruded melt is generally between 0.4dl / g and 0.65dl / g, and the viscosity is relatively high. Low, can not meet the spinning requirements of...

AI Technical Summary

Problems solved by technology

At present, the production route of polyester industrial yarn is mainly used at home and abroad, and medium and high-strength polyester filaments with a strength of about 6.0cN / dtex can be spun. The main process includes: melting and extruding the polymer in a screw press, but not The quality of the filtered melt is unstable during extrusion and spinning, and the spinneret is seriously damaged, resulting in an increase in production costs. The viscosity of the extruded melt is generally between 0.4dl / g and 0.65dl / g, and the viscosity is relatively high. Low, can not meet the spinning requirements of high viscosity, and then extruded through the spinneret hole to form a fine stream, side blowing cooling, filament oiling and winding forming, spinning speed between 600-1000m / min, to obtain the required Medium and high-strength polyester yarn, but this medium-high-strength polyester yarn has low linear density, weak strength, poor elasticity, easy thread ends, and easy to wrinkle

Images