To assess how well WAT and PST perform, when consistent force is applied to the tape and the carton, in various atmospheric conditions.
Take cartons sealed with WAT and those with PST. Use an Instron test machine that employs consistent, compressive force and record the pressure needed to either (1) open the carton along the seal (2) tear the tape or (3) break the carton. Test 10 cartons sealed with WAT and 10 cartons sealed with PST in each of the following atmospheric conditions.
Atmospheric Test Conditions
||23° C (73.4° F) Relative Humidity 50%
||40° C (104° F) Relative Humidity 75%
||-18° C (0.4° F) Humidity less than 10%
INSTRON TEST EQUIPMENT WITH WAT
Tape Integrity Testing Results
Cardboard Cartons Maximum Force Used in Pounds
Using the Instron machine and testing at room temperature, 60 lbs. of pressure was needed to cause the cartons to break. Testers stated that WAT “secures the carton integrity and prevents unnoticed incursions (i.e. tampering) of packed products in all environmental conditions”.
Using the Instron machine and testing at room temperature, the maximum force needed to open the carton was 16.8 lbs. The Testers noted that this force level is easily employed by the average person. The Testers concluded: “PST cannot secure the carton integrity or prevent the package (and its contents) from incursion.”