Define opening and closing Torque…(jar/bottle filling/container packs)
What are the torque tester function…
Thanks
Torque is the rotational force applied during cap application or removal from a container. When applying a closure to a container it is important to utilize the correct amount of torque to ensure a proper seal. Ideally, torque should be evenly distributed throughout the closure.
Myth:
The tighter you apply a closure the less likely the chance the product in the container is going to leak.
Fact:
Applying too much pressure to a closure can actually increase the chances of product leakage.
Over-torquing may cause some points on the cap to have more pressure then others, which could result in an improper seal. If the cap is applied with too little torque, the container may leak or the closure could come off too easily.The chart below illustrates the recommended torque to apply or remove closures of a specific size and material. The figures are based on the minimal amount of torque needed to apply or remove a closure. As a general rule, the amount of torque is about half of the diameter of the cap. Torque is expressed in inches per pound.
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A. Application Torque:
The rotational force with which a closure is applied to a bottle finish during capping. It affects seal integrity and tightness between bottle and closure. Properly established application torque will provide sealing integrity under expected conditions or temperatures, humidity and shock.
B. Removal Torque:
The rotational force with which a threaded closure is removed or unscrewed from a bottle finish. It defines the amount of rotational force necessary to loosen, open, or remove the closure. A properly designed package should have a removal torque range appropriate for its intended use and the consideration of any requirements for child resistant or tamper evident closure needs.
C. Stripping Torque:
The application torque which is sufficient to cause the closure and/or bottle finish to distort and override the matching closure/bottle threads, resulting in loose caps, no seal, or package component deformation.
D. Torque Values:
Torque is defined in inch-pounds or Newton-meters and is measured by various types of torque meters. Specific methods for performing torque tests are defined in Technical Bulletin PBI No. 7. 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. Application torque requirements also vary according to the closure size being used.
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function of tester
A torque tester[1] is required during the packaging design process.[2] It could be used as a destructive tester to identify if there is any material weakness of the packaging during the screwing process. It also allows to define the torque tolerances of the capping machine. The lower torque limit is considered as the minimum pressure of the cap to avoid any leak of the product. This torque test needs to be combined with a leak test with secure seal analyzer. The higher torque limit is the maximum torque the customer can apply to open or close the product’s cap.
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Once torque tolerances have been defined, the cap torque tester is used as a torque control device on the final product. If the measurement are out of the limits, the capping machine needs to be adjusted. Depending on the production process, it could be necessary to control the opening torque, 24hours after the packaging process. Temperature variations can modify product characteristic with a result of different torque measurement.
Thank you so much…
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well come
Dear Mr. Sajjad,
One last thing need to confirm in the USP chapter 671- guideline the table 2, suggested tightness with manually applied torque is basically opening torque!! right
Thanks