During production, our on-site QC team conducts regular product dimension inspections every 2 hours and performs mating tests. We use high-quality PE gaskets inside the lids, which have a moderate hardness and softness to ensure a tight seal. The torque of the bottle/lid meets the standard of 30 N·m. When the bottle is filled with water, the lid is tightened, and the bottle is placed sideways for 24 hours, there is no liquid leakage.

It mainly covers two aspects: 1. During production, we use brand-new raw materials instead of recycled materials to enhance the product’s toughness. 2. For issues that may occur during transportation, we use hole-punched foam boards for all products in packaging—each bottle or lid is fixed to prevent shaking. The outer cartons are high-quality and resistant to damage. The strapping tapes are tightened in an “I” or “well” shape, and each pallet is tightly wrapped with stretch film. This ensures no product damage during transportation.

During the development phase, we designed a certain rounded angle on the inner side of the bottle bottom, which works with the use of a spatula. The inner wall of the bottle body has a high smoothness, preventing the cream from sticking to the wall and leaving no residue during use.

The main cause is product deformation resulting from poor control of process parameters during production. We establish process parameter standards during the development and mold testing phase, strictly implement them during production, and have on-site QC conduct regular inspections. Every batch of products is traceable.

1. Protect the products well during production and conduct oil stain removal treatment. 2. Adjust the flame treatment properly during printing and hot stamping. 3. Use inks and hot stamping foils that are compatible with the bottle material.