The Presto Seal Strength Tester is used to quantify the permanence of adhesion or seal ability of self- adhesive pressure sensitive materials to pull open a seam of a package. Seal Strength is defined as the average force per unit width of seal required to separate progressively a flexible material from a rigid material or another flexible material, under the conditions of the test. Seal Strength Tester is capable of detaching a laminate through an angle of 180 Degree with a jaw separation rate of 300 mm per minute with an accuracy of +/- 2%.
For various small and odd shaped packages, the seal strength cannot be measured by standard means. Applying a constant force and maintaining it for a predetermined time slot will stress the seal over the normal distribution limits. Upper force limit for each individual package will be determined based on experimental testing. By placing the pouch within restraining plates during pressurization, the dimensional stability of the pouch is maintained in a manner that results in stresses applied more consistently along the perimeter of the package, where seals are normally placed. This allows the test to have a maximum probability of detecting the weakest area of the seal and provides a measurement y of the pressure required to “burst” open the pouch. This test only applies to flexible packages with seals placed around the perimeter of a flexible pouch (often referred to as a package).
Presto offers a table top compact model of Seal Strength. The force required for removing a pressure sensitive coated material, which has been applied to a standard test plate under particular conditions, from the plate at a specified angle and speed. Further Seal Strength Fixture (90 Degree) can be provided for evaluating the adhesive i.e. bonding agent response of different laminates. A peak hold for maximum load in memory is provided with unique self calibration facility. Seal Strength Tester is strictly manufactured as per ASTM standards and is highly recommended for use in the packaging & plastic industries like Plastic Films, Foils and Paper coatings are examples of some of the materials used as a lidding mechanisms for packaging applications in a industries. A printout facility can also be included (optional).