Drying method of ultrahigh molecular weight polyethylene (UHMWPE) fibers

Abstract

The invention provides a drying method of ultrahigh molecular weight polyethylene (UHMWPE) fibers. The method comprises the following steps: coiled UHMWPE fiber yarns are fed into a dryer to go through first-stage drying, second-stage drying and third-stage drying in sequence; during the first-stage drying process, hot air blows from the lower parts of the UHMWPE fibers to the upper parts of the UHMWPE fibers; during the second-stage drying process, hot air blows from the upper parts of the UHMWPE fibers to the lower parts of the UHMWPE fibers; and during the third-stage drying process, hot air blows from the upper parts of the UHMWPE fibers to the lower parts of the UHMWPE fibers. Through the drying method provided by the invention, partial heating of the UHMWPE fibers in the drying processes caused by over-high temperature of a conveyor belt is avoided, and the mechanical performance of the UHMWPE fibers is stabilized, so that a finally manufactured anti-puncture fabric has even mechanical performance and high puncture resistance.

Description

technical field [0001] The invention relates to the field of safety protection, in particular to a drying method for ultra-high molecular weight polyethylene fibers. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) fiber is also called high-strength high-modulus polyethylene (HSHMPE) fiber or elongated chain (ECPE) polyethylene fiber, which is composed of relative molecular weight in (1~6)×10 6 Polyethylene is made by spinning and super stretching. Compared with other fiber-reinforced composite materials, ultra-high molecular weight polyethylene fiber composites have lighter weight, better dielectric properties and impact resistance, so they are widely used in aerospace, sea defense, weaponry and other fields. [0003] Stab-resistant fabrics made of ultra-high molecular weight polyethylene fibers have important applications in the field of stab-proof and bullet-proof. At present, the following process steps are generally used for the preparat...

AI Technical Summary

Problems solved by technology

The drying method in the prior art is generally as follows: the filaments of ultra-high molecular weight polyethylene fibers are laid flat on the conveyor belt, and sent to the drying chamber for drying. In the drying chamber, the heater is arranged at the bottom, that is, the filaments are dried. Drying from bottom to top, and the existing conveyor belt is usually iron mesh, which has good thermal conductivity. If the heating temperature is too high, it will easily cause the filaments to be overheated locally on the contact surface with the iron mesh, and the filaments will be heated unevenly, so that after drying The mechanical properties of ultra-high molecular weight polyethylene fiber filaments are unstable, and the mechanical properties of the stab-resistant fabric surface made by ultra-high molecular weight polyethylene fiber filaments are not uniform, which affects the stab-proof and ballistic performance of stab-resistant fabrics; Although the temperature is too low, it can reduce the local heating degree of the ultra-high molecular weight polyethylene filaments, but it cannot dry the filaments sufficiently. Due to the moisture attached to the filaments, it is easy to cause poor adhesion during the gluing process, thereby reducing the temperature. Impact resistance of the final stab-resistant fabric

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