The high protein and fat content of yogurt and its nutrient-rich characteristics make it sensitive to oxygen. Therefore, in order to ensure the shelf life of yogurt, the yogurt in plastic cups usually adopts the compound film with aluminum foil as the cover film for sealing, if the strength of compound fastness between every single layer of the cover film is low, that is, the peeling strength of every single layer of the film is low when it is peeled off, the separation between the cover film and the cup body does not occur when the cover film is torn off. The phenomenon of separation at the paste of each single-layer film, not only brings inconvenience to consumers' consumption but also causes the decline of corporate image. Therefore, it is necessary to use the intelligent electronic tensile testing machine to test the compound fastness of the yogurt lid film. Now the end of the whole test process can help companies monitor the use of composite film material composite fastness to provide a reference.
Test procedure.
(1) Five specimens each 14 mm wide and 190 mm long were cut from the horizontal and vertical sides of the cover film sample with a sampler.
(2) The 10 specimens were manually peeled off by about 50 mm at one end respectively.
(3) Clamp both ends of the peeled specimens with the upper and lower clamps of the equipment, so that the long axis of the specimens coincides with the center line of the two clamps.
(4) Set the test parameters such as displacement, test speed, etc., and click the test start option to start the test.
(5) The equipment automatically tests and records the force value during the peeling of the specimen, and reports the final test results after the test is completed. ,
Test results.
The average peel strength of the specimens tested in this test was 3.992 N/15mm in the transverse direction and 4.634 N/15mm in the longitudinal direction.
The operation of testing the laminate fastness of yogurt cup lids is simple, and the repeatability and accuracy of the test results are high.
