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Blister is a kind of plastic processing technology, the main principle is to heat and soften the flat plastic sheet, use vacuum to absorb on the surface of the mold, cool and then form, widely used in plastic packaging, advertising, industry and so on.

Local foaming of PVC blister tray. Cause analysis:

1. The uneven glue spraying results in a small amount of local glue and a decrease in the bond strength.

2. The problem of PVC film, PVC film contains plasticizer, in the case of aging or heating, plasticizer is easy to migrate to the surface, affecting the bond strength.

3. There is a problem in the heating pipe of the plastic suction machine, resulting in uneven temperature.

terms of settlement:

1. Try to make the spray amount even.

2. Use good quality PVC film.

3. Repair the equipment in time.

PVC suction tray edge can not be absorbed or shrunk.

Cause analysis:

1. The side temperature of PVC is low or the vacuum degree is not enough.

2. The temperature resistance of glue is not enough.

3. After the molding, the pressure will be withdrawn before the temperature drops.

terms of settlement:

1. Increase the temperature or vacuum.

2. Use with curing agent.

3. After the molding, the temperature is cooled to room temperature or slightly higher, and then the vacuum is removed.

The edge of PVC blister tray is not firmly adhered. Cause analysis:

1. The quality of glue is not good and the activation temperature of glue is too high.

2. The temperature of the equipment can not reach the required activation temperature of the workpiece edge.

3. PVC back glue has poor performance or no back glue.

4. The rubber has expired or the storage does not meet the requirements

5. Leakage or improper spraying method.

When these problems occur to PVC blister tray, it is OK to make records and find solutions according to the corresponding problems.