Film transverse stretching device for slit type air port plenum chamber

Abstract

The invention discloses a film transverse stretching device for a slit type air port plenum chamber. One slit type air port plenum chamber is respectively arranged in each of drying ovens 2-7 at a stretching section; air ports of the slit type air inlet plenum chambers are upper and / or lower linear slit air ports; angles alpha between the slit air ports and a film advancing direction are 20-80 degrees, content of a film solvent at an inlet of each drying oven is gradually reduced, and the angles alpha are increased. The length of the slit air ports is L*Sin alpha greater than or equal to the width of a stretched film. Adjacent slit type air port plenum chambers are connected end to end, an angle of intersection of two slit air ports is 30-150 degrees, and an end-to-end distance between adjacent slit type air port plenum chambers is 0-50mm. The width of the slit air ports is 0.5mm-20mm. A hot air temperature of the slit air ports is 130-300 DEG C. When the film in the device moves forwards, each point of the cross section of the film is stretched, hot air of the slit air ports is focused on an inclined line, and temperature at a heated part is uniform and stable, so that the film thickness uniformity is improved to 2.0%, and the mechanical properties and the film surface quality are improved.

Description

technical field [0001] The invention relates to the technical field of polyimide film manufacture, in particular to a film transverse stretching device for a slit-type tuyere static plenum box. Background technique [0002] Polyimide film is a polymer material with excellent properties such as high strength, high toughness, wear resistance, high temperature resistance, and corrosion resistance. It is the main insulating material for making various medium and high-end electrical and electronic components, and is widely used in electrical and electronic industry. At present, the manufacturing process of polyimide film is to use polyamic acid resin solution as raw material, salivate on a salivating machine to obtain a self-supporting polyamic acid film, and then undergo heating stretching, imidization, cooling and shaping to obtain a polyimide film. imide film. [0003] With the design requirements of light, thin, short, small and high reliability of downstream application pr...

AI Technical Summary

Problems solved by technology

However, this device still cannot solve the problem that there are dead angles or hot air intersection areas in the plenum chamber that the hot air cannot reach, and the stability of the hot air velocity in the plenum chamber and the uniformity of the film surface temperature have not been substantially improved.

This kind of current equalization device has complex structure and high cost

Images