Steel Closures: How to Perform a Pull-up Check скачать в хорошем качестве

Steel Closures: How to Perform a Pull-up Check

A pull-up is a non-destructive method for measuring engagement between the lugs and the finish. The pull-up is the distance between the leading edge of the cap lug and the neck finish mold parting line. This method is measured in 1/16” increments. The distance should be 4/16”, plus or minus 2/16”. If your measurement is below 2/16”, or reaches a negative number, it’s an indication that the closure was over applied and potentially stripped. The cause may be that too much top load pressure and/or too much application torque was used. If your pull-up measurement is significantly above 6/16”, the engagement may not be tight enough, which may affect the final seal. However, this distance can vary in either direction due to dimensional characteristics of the glass finish and or closures.