Cap Torque Meters

In the packaging industry, a torque tester for closures is used to measure the opening or closing torque of the screw cap. The correct torque is required for the closure to fulfil its function of sealing tightly. It is a specialised quality control device that can be used on the production line or in the laboratory.

Packaging development

During the packaging development process, it can be used as a destructive tester to determine if the packaging has material weaknesses during the tightening process. It can also be used to determine the torque tolerances of the capping machine. The lower torque limit is the minimum pressure of the closure to prevent product leakage. This torque test must be combined with a leak test using a safe leak tester. The upper torque limit is the maximum torque that the customer can apply to open or close the product closure.

Production line control

Once the torque tolerances are defined, the closure torque tester is used to check the torque of the final product. If the measurements are outside the limits, the capping machine must be adjusted. Depending on the production process, it may be necessary to check the opening torque 24 hours after the packaging process. Temperature fluctuations can affect the product characteristics, resulting in different torque measurements.

• CRANE series CapStar:
  - Digital display (OLED)
  - Object clamp width 10-130 mm
  - 2 Modes: Track, Peak
  - Data export via Micro-USB
  - Capacity 200 / 400 / 600 cNm

• TOHNICHI series TM:
  - Analog scale
  - Memory pointer (series 4TM)
  - Object clamp width ca. 10-50 / 15-90 mm
  - Very low torque applications (below 75 Milli-Newtonmeters)
  - Capacity 1.0 / 1.5 / 2.5 / 5.0 / 7.5 / 10 / 15 / 25 / 50 / 75 mNm 

• TOHNICHI series TME3:
  - Digital LC display
  - Object clamp width 7-190 mm
  - 3 Modes: Peak, Run, Double Peak (1. & 2.)
  - Data export via USB-C
  - Capacity 20 / 200 / 500 / 1000 / 2000 cNm