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A simple rule to follow is the application torque should be approximately 1/2 the inch pounds of the closure millimeter size.
Closure Application Torque
Application torque is the twisting force needed to apply a threaded closure onto a threaded bottle and defined in inch-pounds or Newton-meters. The optimum relationship between applied and removal torques and good sealing characteristics under various physical and environmental conditions must be established for each individual package. The application torque of closures must be handled correctly to ensure the closures work properly with the accopanying package. Closures need to be applied properly to support a secure seal and avoid closure back-off. Application torque requirements also vary according to the closure size. However, the closure should not be applied so tightly that the closure cannot be removed.
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Application torque - torque used to apply a closure to create a peal
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Removal torque - maximum torque required to remove a closure
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Stripping torque - torque necessary to strip or override threads while applying a closure
Closure torque has
three measurements
Application torque can be effected by:
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Moisture on the bottle land area or thread
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Product on the bottle land area or thread
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Closure temperature
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Application equipment
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Application speed
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Bottle material
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Closure material
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Product being packaged in the container
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Thread profiles on the closure and bottle
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Liners in the closure
