APPLICATION TORQUE
Application torque guidelines are taken from Technical Bulletin SPI/PBI 20-1982. They are for closure application by hand under controlled conditions. Special conditions may require values other than those listed.
|
Closure Diameter
|
Application Torque Range
(inch-pounds) |
|
24mm
|
10-18
|
|
28mm
|
12-21
|
|
38mm
|
17-26
|
|
43mm
|
17-27
|
|
48mm
|
19-30
|
|
53mm
|
21-36
|
|
63mm
|
25-43
|
|
70mm
|
28-50
|
|
89mm
|
40-70
|
|
110mm
|
45-70
|
REMOVAL TORQUE
Removal torque values are approximately 40% to 60% of the hand application torque values. Production capping equipment should be adjusted to produce similar immediate removal torque values. If removal torque is used for Quality Control purposes, the best reproducibility and correlation torque is obtained if the specimens are tested within five minutes of the time the closure is applied.Tightness and removal torque may be affected by many factors such as: head pressure and the time cycle, specific caps and bottles used, type of liner, product being packed, time after tightening and conditions of storage. In other words, removal torque alone becomes a measure of how tightly the cap was applied only when other factors are known or controlled.