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- A cap-bottle system with continous threads is one that depends on torque to ensure the products is tight
- A torque can be defined as being an applied rotating force, measured in pounds per inch
- Tightness is usually ensured by the liner (or sealing ring) in the cap, when applied with the proper torque it acts as a gasket on the bottle neck
- When the cap is well applied, the liner is compressed and acts as a spring keeping the cap threads in contact with the bottles threads. The friction between the threads and the spring action helps to immobilize the cap on the bottle
- The bottle-cap system works because of the interaction of various factors including the friction and compression force of the cap materials, the liner and the bottle threads engagement, application torque, capper variations and variations in the opening force occuring with time, storing conditions, handling and shipping
- Because of the complex conbinations of all these factors without considering the minor ones as width variation of the land area, it is realistically impossible to establish a theoric method to determine the application torque required
- The proposed approach lies on an empiric method
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Closures Technical
