8K board adhesive film degumming/Customers complained that a batch of purchased 8K board surface was degummed. After inspection, this batch of products was a batch of 304 plates with 8K film on both sides that were processed outside the company, a total of 200 plates. After the film was removed, there was residual glue on the surface of the plate. The batch of plates was processed from 8K to the customer. After 5 days, the phenomenon of degumming is abnormal. First consider whether the quality of the film. According to foreign processing units, the quality of the film supplier is stable, and no such situation has been found before. The remaining unused film was inspected and no abnormalities were found. Excluding the cause of the film, the customer complainant re-observed the stainless steel plate, and there were many iron red powders remaining on the surface of the plate, which can be analyzed. The cleaning of the batch of steel plates was not in place, that is, the polishing liquid remained on the steel plate . The 8K polishing liquid of this unit is composed of iron oxide red plus nitric acid and water, so the residual polishing liquid contains nitric acid, which is oxidizing acid like nitrate, and can react with the organic matter of the adhesive layer on the adhesive film, resulting in thinning of the adhesive layer , Remaining on the steel plate when tearing the film. In addition, in August, when the temperature reached 38 degrees Celsius, the reaction between nitric acid and the glue layer was accelerated. It is not uncommon for the film to have residual glue, and the customer prosecutor also handled many such quality objections. Some of them are of poor quality and some are improperly used. This case is caused by improper use. The procedure of double-sided grinding 8K of the foreign association company is to grind one side first, then roll over the film and then grind the other side, so that the first side is immersed in the grinding liquid, and it cannot be completely cleaned when cleaning, so it will It will cause the residue of grinding fluid and lead to degumming. Due to the serious degumming phenomenon and the large quantity, it is already difficult to clean with organic solvents, so the customer complainant recommends returning the batch of flat plates to the company and tearing off the film and regrinding, which can effectively remove the residual glue on the surface. The customer agrees to this treatment method .