How to recognize and choose plastic bottle cap mould? One of the foremost points is to observe the final bottle caps.
Plastic bottle cap general knowledge:
1) Internal dimension:(± 0.15mm), thread inner diameter,inner-plug outer diameter, top thickness;
2) External Dimension (± 0.30mm): Cap Outer diameter,Cap height;
3) Others: Weight (± 0.1g).
1) Surface: Complete shape. Without starving, injury, flare, and out of shape.
2) Color: meet the tolerance of sample, even color.
3) Sealing: Without injury, distortion.
4) Lateral seal/ top seal: No bubble or injury.
5) Thread: Not less than thread inner diameter lower limit.
6) Cap slitting: No breakpoints, conglutination orstarving.
7) Injection gate: Nocracks, holes, injection gate residue, or sink marks.
8) Pollution: No oil marks, dirt, stains, etc.
9) Printing: Clear pattern, no printing lack or other defects, meet the tolerance of ink and pattern requirement, off-center tolerance value ± 0.3mm.
3. Physical Property:
1) Thermostability: No broken, distortion, and leakage.
2) Low temperature resistance: No distortion and leakage.
3) Drop performance: No broken, no leakage.
4. Peculiar smell: No abnormal smell.
5. Tamper Evident( TE) physical performance:
1) Capping: No distortion and break of TE, after capping.
2) Anti-theft:With evidence after cap open.
3) Open torque (lbf. in): TE broken torque (lbf. in)
Hot filling cap(Compression cap) :13~18, 5~9.
Hot filling(injection cap):15~18, 5~9.
Aseptic bottle cap :10~16, 8~12.
Water cap: 6~14. 5~9.
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