APPLICATION-SPECIFIC ACCESSORIES

Sometimes an application, specimen or material requires a special gripping method. General purpose grips may not be adequate and can result in problems such as jaw breaks or premature failure of the specimen. The grips and fixtures in the following section have been specially engineered to provide solutions to the unique problems presented by some testing applications.

Instron is experienced in producing engineered solutions for particularly difficult applications. Some examples of engineered solutions are shown in Section 3. Our worldwide staff of technical personnel is available to discuss your application in greater detail to help you determine the solution that’s right to help determine the right solution for your lab.

Adhesive Peel Fixtures

Adhesive peel tests may be performed in either variable angle, 90°, 180°, T-peel, or floating roller configurations. Peel test analysis requires the averaging of the load values over a defined range of peel length.

Principle of Operation

Peel fixtures are used to measure the bond strength between laminated surface coatings, films, packaging and their rigid backings, as well as other bonded structures. To initiate a test, the laminate is partially peeled from the backing medium. The medium is then inserted into the fixture and the free end of the sample is inserted into an appropriate upper grip. The upper grip that is connected to the crosshead is then driven in the tensile direction and the laminate is peeled from the backing. The force required to peel the laminate is monitored by the load weighing system, providing a direct measurement of bond strength.

Application Range

• Type of test: 90° and variable degree angle, T-peel and German wheel peel tests

• Type of materials: Films, tapes, laminated surface coatings, labels and decals