How to deal with the problems in the production process of PVC blister film?

The production of PVC blister film is a very delicate work. If we do not pay attention to some of the details, some defects will be formed, which will damage the quality of the product. So how can we avoid such problems? ZHONGSHAN LINYANG PLASTIC CO.LTD told you today. Phenomenon 1: Analysis of the causes of foaming in the groove: 1. The temperature or pressure does not meet the requirements, resulting in false suction; 2. The amount of glue is not enough, the amount of spraying is small or the sheet is glued; 3. Preheating (softening PVC film) or suction time (molding time) is not enough; 4. After the plastic forming, the pressure is withdrawn before the temperature has dropped. 5. The heat resistance of the glue itself is not enough. Solution: 1. Increase the temperature or vacuum degree; 2. Increase the amount of glue applied and choose a board with good quality; 3. Increase the preheating or forming time; out of the vacuum. 5. Use with curing agent. Phenomenon 2: Analysis of the causes of local foaming: 1. The glue spraying is uneven, resulting in a small amount of local glue, which reduces the bonding strength; 2. The problem of PVC film, PVC film contains plasticizer, in the case of aging or heating 3. There is a problem with the heating tube in the blister machine, causing uneven temperature. Solution: 1. Try to make the amount of glue sprayed evenly; 2. Use good quality PVC film; 3. Repair the equipment in time. Phenomenon 3: Analysis of the reasons for not being able to absorb or shrinking the edge: 1. During blistering, the side temperature is too low or the vacuum degree is not enough; 2. The temperature resistance of the glue is not enough; 3. After the blister molding, the temperature has not dropped Down the case, just undo the stress. Solution: 1. Increase the temperature or vacuum degree; 2. Use with curing agent; 3. After plastic forming, the temperature is cooled to room temperature or slightly higher, and then the vacuum is withdrawn. Phenomenon 4: Analysis of the causes of pockmarks on the surface of the blistered product: 1. The particle size of the glue is large, and thin PVC film is used, which is easy to produce pockmarks. The characteristics of such pockmarks are uniform dispersion; 2. Use with curing agent When the curing agent is not completely dispersed; 3. The surface of the board is not cleaned, or after the glue is sprayed, the workshop is dusty and sticks up, the pitting is very unevenly dispersed, and the size is different; 4. The viscosity of the glue is too large , uneven dispersion; 5. The viscosity of the glue is too small or the solid content is low, causing the board to fluff. Such pits generally appear in the corners of the grooves and appear in blocks. 6. The air pressure of the spray gun is not enough, and the atomization is not good. 7. The glue is not filtered (in this case: a bucket of glue is used at the end, if there is stolen goods or conjunctiva is formed in it, it should be filtered with a filter). Solution: 1. Choose glue with small particle size; 2. When preparing curing agent, prolong the stirring time so that the curing agent can be completely dispersed; 3. Clean the surface of the board before spraying glue, and separate the glue spraying workshop; 4. Choose glue with suitable viscosity or high solid content; 5. After the glue is dry, it can be polished with fine sandpaper; 6. Increase the vacuum degree to adjust the atomization effect; 7. When using, filter it with a filter screen.

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