Plastic caps – Qualification criteria for plastic bottle caps

③Sealing ring: no damage, deformation, strain;
④Side seal and top seal: no air bubbles or damage;
⑤Thread: Slight strain on the thread at the non-starting point is allowed, not less than the lower limit of the inner diameter of the thread;

⑥Connecting bridges (tangent points): no breakpoints, adhesions or not full;

⑦ Gate (injection cover): no perforation or cracking, no obvious gate residue or depression;
⑧ Pollution: no oil, dirt, rust, impurities;
⑨Printing: The pattern is clear, there are no defects such as missing printing, missing printing, etc., which meets the allowable limit of poor color registration, cross-inking, and pattern color, and the allowable center deviation of partial printing is ±0.3mm.

(3) Printing pattern adhesion performance:
①Hot water immersion method (hot filling cover): no obvious discoloration
② Peracetic acid soaking method (sterile cover): no obvious decolorization
③Tape sticking and peeling method: no obvious discoloration

⑷ Sealing performance:
① 700kPa×1min, boost speed 35kPa/sec, no air leakage or tripping
②LB angle (leakage angle - broken ring angle):
>0, squeeze the bottle body before opening the cap and breaking the ring without water escaping

⑺ Physical properties of anti-theft ring:
①Covering performance: the cover body and anti-theft ring will not be deformed, broken or retracted after the cover is closed;
② Anti-theft performance: After opening, the connecting bridge should be obviously damaged;
③Opening torque (lbf.in): ring breaking torque (lbf.in)
Hot charging cover (pressure): 13～18 5～9
Hot charging cover (Note): 15～18 5～9
Sterile cover: 10～16 8～12
Injection water cap: 6～14 5～9
Compression plastic water cover: 6～14 5～9