Semi-finished products in the preform injection stage
When the preform injection weight, bottle mouth size, and stress line condition exceed the process control range, double sampling and measurement are required. If the excess is true, an isolation form is issued, production improvement is notified, and follow-up is performed. Semi-finished products below the lower limit of the specification are isolated.
Semi-finished products in the bottle mouth crystallization stage
When the bottle mouth size and bottle mouth crystallization condition are abnormal, double sampling and measurement are required. If the excess is true, an isolation form is issued, production improvement is notified, and follow-up is performed. Semi-finished products in the relevant period are isolated for inspection.
Finished products in the bottle blowing section
- When the bottle height, bottle wall thickness, body diameter, filling point capacity, capacity shrinkage rate, and body diameter shrinkage rate exceed the process control specification range, double sampling and measurement are required. If the excess is true, an isolation form is issued, production improvement is notified, and follow-up is performed.
- Heat resistance: After hot water filling, the center temperature of the bottle is 91±1℃. When the bottle body is obviously deformed, double sampling and measurement are required. If the excess is true, an isolation form is issued, production improvement is notified, and follow-up is performed.
- When the load, drop strength, and heat-resistant vacuum indexes do not meet the specification requirements, double sampling and measurement are required. If the excess is true, an isolation form is issued, production improvement is notified, and follow-up is performed.
- When there is a slight abnormality in the appearance of the product, the production line is contacted to take preventive measures to avoid the occurrence of defective products. When the appearance is seriously abnormal, an isolation form is issued, production improvement is notified, and semi-finished products in the relevant period are isolated for inspection.
Tracking and isolation of defective products
Once defective products are found during production, the site should be notified immediately for adjustment and improvement, and defective products should be tracked and isolated. The operation method is: sample the previous pallet produced during the period. If defective products are found, continue to sample the adjacent previous pallet until no defective products are found.