Method for adhesive tape treatment in production of thin film by casting machine

Abstract

The invention discloses a method for adhesive tape treatment in the production of thin film by a casting machine. On the surface of a steel tape, both the temperature in a viscosity drying tunnel for polyamic acid resin solution and the wind velocity at the outlet of a nozzle are regulated to a best state, the stripping condition of thin film at the steel tape where a front drum operates is detected, the speed of the steel tape is decreased when the adhesive tape width at one or two sides of the steel tape is more than 5.0mm, the speed of the steel tape is increased when the adhesive tape width at one or two sides of the steel tape is not more than 3.0mm, and the speed of the steel tape is decreased or increased when the adhesive tape width at one or two sides of the steel tape is in a range from 3.0 to 5.0mm. The increase or decrease for the speed of the steel tape is conducted in multiple steps, and the amplitude of each adjustment is from 0.1 to 1.5m / min, which is within the normalspeed range of the steel tape. In order to keep the solvent content of a semi-finished thin film unchanged, the temperature of the drying tunnel and / or the wind velocity at the outlet of the nozzle of a plenum chamber is regulated during speed adjustment of the steel tape. The lip opening of a casting die head can also be regulated during speed adjustment of the steel tape to eliminate the adhesive tape, and the increase or decrease for the lip opening of the die head can be conducted in multiple steps as well. The method of the invention can eliminate the adhesive tape rapidly to enable the casting machine to operate normally.

Description

(1) Technical field [0001] The invention relates to a film production technology of a salivating machine, in particular to a method for treating sticky tape produced by a salivating machine film. (2) Background technology [0002] During the film production process of the salivating machine, the problem of liquid film sticking to the tape often occurs. Although the surface cleanliness of the steel strip is in the best state, the viscosity of the polyamic acid resin solution and the temperature of the drying tunnel are also in the optimal range, and the speed of the steel strip is in the best range. Within the normal range, it is still difficult to avoid the appearance of sticky tape. In particular, the extrusion die is used to directly form the resin solution on the steel strip to form a salivating liquid film. When the semi-finished film is peeled off, there may be sticky bands on the edges of both sides of the steel band. When the sticky bands are severe, the width can eve...

AI Technical Summary

Problems solved by technology

[0002] During the film production process of the salivating machine, the problem of liquid film sticking to the tape often occurs. Although the surface cleanliness of the steel strip is in the best state, the viscosity of the polyamic acid resin solution and the temperature of the drying tunnel are also in the optimal range, and the speed of the steel strip is in the best range. Within the normal range, it is still difficult to avoid the appearance of sticky tape

In particular, the extrusion die is used to directly form the resin solution on the steel strip to form a salivating film. When the semi-finished film is peeled off, sticky bands may appear on the edges of both sides of the steel band. When the sticky band is severe, the width may even reach 10mm. To a large extent, it affects the continuous production and application of the semi-finished film after drying in the subsequent section

If the sticky tape cannot be resolved as soon as possible, the width and thickness of the sticky tape will accumulate every time the steel belt runs one cycle, resulting in broken edges on both sides or one side, which not only wastes materials, but also prevents the subsequent sections from entering normal operation.