How to detect the shrinkage ability of pof shrink film

Pof shrink film is mainly used for transportation and packaging of products. It can play a very good protective role and has a good shrinkage force. We will check the shrinkage ability before half of use. The quality of shrink film lies in its shrinkage adhesion, so how to detect its shrinkage ability? Let’s study together: 　　1. Cut out 20 samples each with a width of 15.0mm along the horizontal and vertical directions of the pof shrink film, that is, 10 groups of samples in the horizontal and vertical directions, and each group of samples is used for the heat shrinkage force. , Cold shrinkage force, shrinkage rate test. The length of the sample should ensure that there is an effective length of 100mm between the clamps.　　2, test the thickness of the sample, test at least 3 points, and take the average value.　　3. Two round holes are formed on the surface of the sample with a special sample maker to facilitate the clamping of the sample.　　4. Take any three groups of samples in the horizontal or vertical direction, and clamp them to the three sets of fixtures of the equipment. Each set of fixtures includes two sample fixtures equipped with force sensors and displacement sensors. The clamped sample should be completely flat and the force sensor should not be stressed.　　5. Set the test parameters such as pof shrink film test temperature and end temperature, and click the start test option to start the test. 6. When the temperature in the heating chamber of the equipment reaches the test temperature, the sample enters the chamber automatically, and the test starts timing. The sample shrinks by heat and generates heat shrinkage force. When the heat shrinkage force reaches the set conditions, the sample automatically exits the chamber. The force generated is the shrinkage force. The equipment automatically records and displays the heat shrinkage force, cold shrinkage force, and shrinkage rate of the sample from entering the chamber to the end of the test in real time. After the test, the device displays the larger shrinkage rate, heat shrinkage force, and cold shrinkage force of each group of samples.　　7. Repeat the operations from (3) to (5) until the 10 horizontal and vertical samples have been tested.　　 The current pof shrink film on the market mainly includes POF, OPS, PE, PVC and other materials. If the shrinkage force is not good, problems such as looseness and deformation of the product due to insufficient shrinkage or excessive shrinkage may occur during use. So it is very necessary for product testing. Author: one on Vera: pof shrink film four characteristics