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- The samples tested will have to be representative of the final product: same bottle, same cap and liner, same product packaged, same storing and shipping conditions.
- With a bench-style torque meter, determine 4 levels of application torque that will generate the following suggested immediate removal torque:
- 10 - 12 inch-lb
- 15 - 17 inch
- 20 - 22 inch-lb
- 27- 29 inch-lb
- You can base your analysis on the premiss that 8 inch-lb of opening torque on a 28mm is the target for an average strenght person.
- The immediate removal torque can be determined right after the application; it also could be determined 1, 5 or 10 minutes after. It is important to be consistent because you will use these values in production.
- With these values in mind, prepare a minimum of 55 samples for each of the 4 groups of the above torque.
- For example: If you determined you need to apply 20 pounds per inch to obtain 10 to 12 inch-lb at immediate opening, then apply 20 inch-lb on the 55 samples of the first group. After, note the removal torque on 5 samples on the following schedule for each of the above 4 groups: Immediate, 1 day, 3 days, 1 week, 2 weeks, 3 weeks, 5 weeks, 6 weeks, 7 weeks and 8 weeks.
- With the data resulting from these tests you can build two graphics similar to the ones illustrated in the next steps.
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Closures Technical
