Process for drying glass fiber filament by using hot blast air and microwave

Abstract

The invention relates to a process for drying a glass fiber strand by using hot blast air and microwave, which comprises the following steps: (a) temperature-raising time period: the setting temperature of a drying oven during the temperature-raising time period is 85-115DEG C, the time is 1-2.5hours and the microwave power density is 0-4kW / m<3>; (b) water-pumping time period: the setting temperature of the drying oven during the water-pumping time period is 100-125DEG C, the time is 2-10 hours and the microwave power density is 0-4kW / m<3>;and (c) film-forming time period: the setting temperature of the drying oven during the film-forming time period is 115-130DEG C, the time is 1-4.5 hours and the microwave power density is 0-2kW / m<3>. The invention can overcome the technical defects in the prior art that nonuniform drying inside and outside a spool bobbin or a spinning cake, poor film-forming property by drying, easy yarn burst, long drying time, poor stiffness and instable production quality in the process of drying the glass fiber strand and an oversized glass fiber spool bobbin cannot be effectively dried.

Description

technical field [0001] The invention relates to a drying process for glass fiber precursors, in particular to a process for drying glass fiber precursors by using hot air and microwaves. Background technique [0002] In the prior art, the use of hot air drying equipment to dry glass fiber precursors has the following technical defects: the hot air drying equipment occupies a large area, the output is low, and the drying time is long. When mixing hot air and microwaves to dry glass fiber strands, although the floor area of ​​the drying equipment is reduced; however, if the temperature in the drying furnace, drying time and microwave power density are not selected properly, the glass fiber The fiber has poor film-forming properties, explosive yarns, and poor stiffness. Moreover, in the prior art, for super-large glass fiber yarn clusters, whether it is dried with hot air or mixed with hot air and microwave, there are problems such as low output, long drying time, poor film fo...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: aiming at the poor drying film-forming property, explosive yarn, long drying time, poor stiffness, unstable product quality and inability to dry the glass fiber precursor in the prior art. The technical defect of effective drying of ultra-large glass fiber yarn clusters provides a process for drying glass fiber strands by using hot air and microwaves

Images