Phenomenon: foaming groove
Foaming reason analysis of large area A.: 1. temperature or pressure does not meet the requirements, resulting in false ceiling; 2. glue spraying is not enough, less or plate boronizing; 3. preheating (softening PVC film) or blister time (forming time) is not enough; 4. plastic molding, the temperature did not drop down the situation, on the withdrawal of heat pressure. 5. glue itself is not enough.
Solution: 1. increase in temperature or vacuum; 2. increase the quantity of glue, choice of plate of good quality; 3. increase the preheating or molding time; 4. plastic molding temperature after cooling to room temperature or slightly high vacuum was withdrawn.
Analysis of the causes of partial foaming B.: 1. spray is not uniform, resulting in partial glue less, the bond strength decreased; 2.PVC membrane, PVC membrane containing plasticizer, or in the case of heat aging, plasticizer easy to migrate to the surface, affecting the bond strength; 3. plastic machine internal heating pipe problems that caused by uneven temperature.
Solution: 1. to make the usage amount evenly; 2. PVC films of good quality; 3. timely maintenance of equipment.
Phenomenon two: side fail to attract or shrink analysis reasons: 1. plastic, the side of the low temperature or vacuum is not enough; 2. glue temperature is not enough; 3. plastic molding, the temperature is not down the case, on the withdrawal of pressure.
Solution: 1. increase in temperature or vacuum; 2. curing agent; 3. plastic molding temperature after cooling to room temperature or slightly high vacuum was withdrawn.
Phenomenon 3: the plastic product surface pitted analysis: 1. glue size, the use of PVC thin film, prone to pitting, characteristics of such pits are dispersed; 2. curing agent, curing agent is not fully dispersed; 3. plate surface is not clean, or glue, workshop dust, stuck up, the point spread is not uniform, and sizes; 4. glue viscosity is too large, uneven dispersion; 5. glue viscosity is too small or low solid content, caused by the plate pilling, generally appear in such pits groove edge, a 6. gun air pressure is not enough. Not good. 7., spray glue is not filtered (in this case refers to a bucket of glue used in the end, if the inside into the dirt or conjunctival, use the filter).
Solution: the choice of small size glue; 2. with curing agent, prolong mixing time, the curing agent can be dispersed completely; 3. spray surface treatment before the clean sheet, spraying workshop to separate 4.; choose suitable viscosity glue or high solid content glue; 5. glue after drying, use fine sandpaper an increase of 6.; the vacuum regulating atomization effect; 7., use the filter.
Phenomenon four: local production of orange peel analysis: 1. local glue spraying too much; 2. plate surface oil and glue shrinkage; curing agent 3. is not fully dispersed shrinkage.
1. so that the amount of glue solution evenly; 2. to keep the surface of the plate is clean; 3. stirring curing agent, the dispersion.