Phenomenon: Groove bubbling Blistering over a large area

Cause analysis: 1. The temperature or pressure does not meet the requirements, causing false suction;

​ ​ ​ 2. The amount of glue is not enough, the amount of spraying is small or the board has glue seepage;

3. Insufficient preheating (softening of PVC film) or blister time (molding time);

​ ​ ​ 4. After blister molding, remove the pressure before the temperature has dropped.

5. The glue itself is not heat-resistant enough.

Solution: 1. Increase the temperature or vacuum;

​ ​ ​ 2. Increase the amount of glue and choose good quality boards;

​ ​ ​ 3. Increase preheating or molding time;

​ ​ ​ 4. After blister molding, cool down to room temperature or slightly higher before removing the vacuum.

5. Use with curing agent.

Phenomenon: local blistering

Cause analysis: 1. Uneven glue spraying results in less local glue, which reduces the bonding strength;

The PVC film contains plasticizer, the plasticizer easily migrates to the surface when aged or heated, affecting the bonding strength;

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 spray even;

​ ​ ​ 2. Use good quality PVC film;

​ ​ ​ 3. Maintain equipment in a timely manner.

Phenomenon: unable to suck on one side or shrinking on one side

Cause analysis: 1. When blistering, the side temperature is low or the vacuum degree is not enough;

​ ​ ​ 2. The temperature resistance of the glue is not enough;

3. After blister molding, remove the pressure before the temperature drops.

Solution: 1. Increase the temperature or vacuum;

​ ​ ​ 2. Use with curing agent;

3. After blister molding, cool down to room temperature or slightly higher before removing the vacuum.

Phenomenon: There are pits on the surface of the blister-molded product.

Reason analysis: 1. The particle size of the glue is large and thin PVC film is used, which is prone to pitting. The characteristic of such pitting is that it is evenly dispersed;

​ ​ ​ 2. When used with a curing agent, the curing agent is not completely dispersed;

The surface of the board has not been cleaned, or after the glue was sprayed, there was a lot of dust in the workshop, and the pits were stuck on, and the pitting was unevenly distributed and of different sizes;

​ ​ ​ 4. The viscosity of the glue is too high and the dispersion is uneven;

5. The viscosity of the glue is too low or the solid content is low, causing the board to fluff. Such pitting usually appears in the corners of the grooves and appears in lumps.

​ ​ ​ 6. The air pressure of the spray gun is not enough and the atomization is not good.

The glue is not filtered (this situation means: if a bucket of glue is used until the end, if stolen goods fall into it or there is conjunctiva, it must be filtered with a filter).

Solution: 1. Choose glue with small particle size;

​ ​ ​ 2. When preparing the curing agent, extend the stirring time so that the curing agent can be completely dispersed;

​ ​ ​ 3. Clean the surface of the board before spraying glue, and the glue spraying workshop must be separated;

​ ​ ​ 4. Choose glue with appropriate viscosity or glue with high solid content;

5. After the glue is dry, it can be polished with fine sandpaper;

​ ​ ​ 6. Increase the vacuum degree and adjust the atomization effect;

​ ​ ​ 7. When using, filter with a filter.

Phenomenon: Local orange peel production

Cause analysis: 1. Excessive local glue spraying;

​ ​ ​ 2. There is oil on the surface of the board, which causes shrinkage holes in the glue;

3. The curing agent is not completely dispersed, resulting in shrinkage cavities.

Solution: 1. Spray glue in an appropriate amount and evenly;

​ ​ ​ 2. Keep the surface of the board clean;

3. Stir the curing agent thoroughly to disperse it evenly.