Influence of air volume on composite film bag
1. The role of air volume
The volatilization of the solvent is actually the process of diffusing the substance from high concentration to low concentration. The greater the concentration difference, the stronger the diffusion effect. Therefore, the dry hot air must flow through the substrate with sufficient wind speed, air volume, and air pressure (fan air volume, air-jet slits, and air gap all affect the air pressure) to maintain the appropriate concentration difference at all times, thereby obtaining a good drying effect.
2. The air volume, speed and pressure of the inlet air are mainly related to the type and content of the solvent.
3. The exhaust air volume must be greater than the air intake volume, generally about 10% larger , that is, maintaining a negative pressure is conducive to solvent evaporation, and avoids the high concentration of solvent in the oven, reaching the explosion limit, causing a vicious explosion accident.
4. In the normal drying temperature range, the change of air volume has a great influence on the drying effect. The air volume is large and the drying effect is good.
5. The air flow in and out should be matched. It is necessary to ensure that the exhaust air is greater than the air intake, and also to ensure that the composite film bag does not produce jitter. Put a piece of composite film at the tuyere, the composite film is moderately sucked into the oven, and the base material does not shake, at this time the amount of air in and out is suitable for matching.
6. The return air should be moderate
The purpose of return air is to save energy. However, the higher solvent concentration in the return air is not conducive to solvent evaporation, so it must be moderate. The solvent concentration in the first and second sections of the oven is high, and the return air is as small as possible, preferably no more than 30% ; the solvent concentration in the third section of the oven is lower, up to 50% .
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