Most people choose stretched film because of the shrinkage and fixability of the stretched film. Because stretch film characteristics can be applied to the packaging of small items. The product is wound and packaged with the help of the stretching force of the stretched film after stretching. The packaged product looks compact and takes up no space. It can effectively prevent mutual misalignment and movement during transportation. The production of stretched film requires heat treatment, so how to heat treat the stretched film? What are the measures?


Stretched film during heat treatment. Due to the cold plastic deformation of the workpiece, cold work hardening occurs. This reduces the plasticity of the stretched film. Instead, it increases deformation resistance and hardness.  Plus the mold design is not reasonable. So intermediate annealing is needed to soften the metal and restore its plasticity. 


Note: Intermediate annealing is not necessary in general processes. After all, you need to increase costs, choose between adding processes and increasing annealing, and use them with caution. Annealing generally uses low temperature annealing. That is, recrystallization annealing. There are two points to note when annealing, namely decarbonization and oxidation. Here mainly talk about oxidation, the workpiece after oxidation has scale. Make the effective thickness of the workpiece thinner and increase mold wear.


The above is how to heat treat the stretched film. The content is for your reference only! If you want to know more about stretch film, please pay attention to the website of Mingye Technology's stretch film manufacturers. If you want to know the wholesale price of stretch film, please contact us.