Cap torque testing overview

Container cap torque is important, not only for package appearance and product integrity, but for customer satisfaction and consumer safety. We fully support a total commitment to quality management at STI, after all, we developed this advanced torque testing technology by engineering and manufacturing the most sophisticated, up to date, electronic torque tester available in the world today.

We know that today's consumer judges product quality based on many observations which include packaging, appearance and the overall effectiveness or efficacy of the product. Proper cap torque not only impacts the package's appearance and functionality, the product's freshness and shelf-life, but more importantly, the consumer's perception of the manufacturer's level of quality and concern. In today's competitive market place, the consumer avoids buying products if there is detectable leakage, tampering, lack of air tightness, or something as simple as a hard to remove closure, and especially when closure removal requires the use of a tool.

Today's manufacturing operations are very concerned with loose caps which will clearly affect product freshness, product stability, shelf life and possible leakage. Stability is of particular concern, since moisture sensitive products require that the integrity of the container closure and seal be maintained. Stability considerations are critical, since liquid product loss due to evaporation or addition of moisture to a dry product can cause contamination, discoloration, significant changes in potency, and thereby, affect the efficacy of the product.

Container cap torque can significantly affect the success of a product. Closure application defects are relatively easy to prevent by assuring the closure application meets required specifications. Component integrity also shares in the success of assuring properly secured closures.

To achieve the desired level of product quality, the component manufacturer sets certain specifications for acceptable torque values while testing samples based upon this and other criteria. Testing methods generally are performed off-line on collected production run samples grouped for the purpose of frequency, evaluation, and statistical analysis. Testing is also performed for a broad base of criteria pertaining to other company considerations and protocol.

It is not only the torque applied by a capping head, that affects the immediate removal torque, but also the topload force, the closure gripping pressure and the container clamping force.  Other sources of variablility are: possible pressure changes inside the container, temperature change, and material differences from one container batch to another. When a capper does not have a closed loop control, that monitors and adjust the topload, and the clamping forces on-the fly, as a result the removal torque may be slightly different for each container.

At Sure Torque, we not only offer precise closure torque testing capability, we provide equipment evaluation of a closure system's compatibility to container, efficiency of tamper evident techniques, and closure or liner durability. These methods determine how a closure and container conform to performance criteria while assuring product integrity and assists in the evaluation of the Capper's capabilities