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...

Examples

Embodiment 1

[0012] Before driving in this example, clean the surface of the steel strip with tools such as copper shovel, copper ball, acetone, alcohol, and silk cloth, so that the surface of the steel strip (especially at the edge of both sides of the steel strip at about 100mm) is free of foreign matter such as solidified resin particles and impurities , adjust the viscosity of the polyamic acid resin solution to 49,300 centipoise, adjust the temperature in the drying tunnel to 200.0°C±2.0°C, and the hot air velocity to 35.0m / s±2.0m / s. 30 ~ 75μm, adjust the opening to 50μm when driving, the normal running speed of the steel belt is 3.5 ~ 8.0m / min, set the speed of the steel belt to 5.0m / min when driving, start to salivate, the steel belt runs for a week, and runs on the front drum The peeling of the film was detected at the steel belt, and it was found that the width of the adhesive tape on one side of the steel belt was 5.5mm, and the width of the other side was 6.0mm. The temperature ...

Embodiment 2

[0014] The relevant parameters of the salivating machine in this example are the same as those in Example 1. Before starting the machine, adjust the opening of the mouth of the salivating die to 55 μm and the speed of the steel strip to 5.0 m / min. The width of the adhesive tape is 2.7mm, the running speed of the steel strip is increased from the current 5.0m / min to 5.5m / min, and the wind speed at the outlet of the static pressure box nozzle in the drool drying channel is increased from the current 35.0m / s±2.0m / s to 37.0m / s±1.5m / s; after the steel belt runs for a week, it is found that the width of the adhesive tape on one side of the steel belt is reduced to 2.1mm, and the width of the adhesive tape on the other side is reduced to 1.9mm, and the speed of the steel belt increases from 5.5m / min to 6.8m / min, then increase the wind speed at the nozzle outlet of the static pressure box in the drool drying tunnel to 43.0m / s±1.5m / s; again check that the width of the adhesive tape on ...

Embodiment 3

[0016] The relevant parameters of the salivating machine in this example are the same as those in Example 1. Before starting the machine, adjust the opening of the mouth of the salivating die to 65 μm and set the speed of the steel strip to 5.0 m / min. The width of the adhesive tape is 8.2mm, and the width of the adhesive tape on the other side is 7.9mm. The running speed of the steel strip is reduced from the current 5.0m / min to 4.2m / min. 195.0°C±2°C; after running the steel belt for a week, it was found that the width of the adhesive tape on one side of the steel belt was reduced to 5.6mm, and the width of the adhesive tape on the other side was reduced to 4.8mm, and the running speed of the steel belt was reduced from 4.2m / min to 3.5m / min min, and at the same time, the wind speed at the nozzle outlet of the static pressure box in the drool drying channel is reduced to 26.0m / s±2.0m / s; again, the sticky tape on one side is reduced to 1.7mm, and there is no sticky tape on the ot...

(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...

Examples

Embodiment 1

[0012] Before driving in this example, clean the surface of the steel strip with tools such as copper shovel, copper ball, acetone, alcohol, and silk cloth, so that the surface of the steel strip (especially at the edge of both sides of the steel strip at about 100mm) is free of foreign matter such as solidified resin particles and impurities , adjust the viscosity of the polyamic acid resin solution to 49,300 centipoise, adjust the temperature in the drying tunnel to 200.0°C±2.0°C, and the hot air velocity to 35.0m / s±2.0m / s. 30 ~ 75μm, adjust the opening to 50μm when driving, the normal running speed of the steel belt is 3.5 ~ 8.0m / min, set the speed of the steel belt to 5.0m / min when driving, start to salivate, the steel belt runs for a week, and runs on the front drum The peeling of the film was detected at the steel belt, and it was found that the width of the adhesive tape on one side of the steel belt was 5.5mm, and the width of the other side was 6.0mm. The temperature ...

Embodiment 2

[0014] The relevant parameters of the salivating machine in this example are the same as those in Example 1. Before starting the machine, adjust the opening of the mouth of the salivating die to 55 μm and the speed of the steel strip to 5.0 m / min. The width of the adhesive tape is 2.7mm, the running speed of the steel strip is increased from the current 5.0m / min to 5.5m / min, and the wind speed at the outlet of the static pressure box nozzle in the drool drying channel is increased from the current 35.0m / s±2.0m / s to 37.0m / s±1.5m / s; after the steel belt runs for a week, it is found that the width of the adhesive tape on one side of the steel belt is reduced to 2.1mm, and the width of the adhesive tape on the other side is reduced to 1.9mm, and the speed of the steel belt increases from 5.5m / min to 6.8m / min, then increase the wind speed at the nozzle outlet of the static pressure box in the drool drying tunnel to 43.0m / s±1.5m / s; again check that the width of the adhesive tape on ...

Embodiment 3

[0016] The relevant parameters of the salivating machine in this example are the same as those in Example 1. Before starting the machine, adjust the opening of the mouth of the salivating die to 65 μm and set the speed of the steel strip to 5.0 m / min. The width of the adhesive tape is 8.2mm, and the width of the adhesive tape on the other side is 7.9mm. The running speed of the steel strip is reduced from the current 5.0m / min to 4.2m / min. 195.0°C±2°C; after running the steel belt for a week, it was found that the width of the adhesive tape on one side of the steel belt was reduced to 5.6mm, and the width of the adhesive tape on the other side was reduced to 4.8mm, and the running speed of the steel belt was reduced from 4.2m / min to 3.5m / min min, and at the same time, the wind speed at the nozzle outlet of the static pressure box in the drool drying channel is reduced to 26.0m / s±2.0m / s; again, the sticky tape on one side is reduced to 1.7mm, and there is no sticky tape on the ot...