To be honest: The long-term operating temperature of ordinary PE release film is usually around 60-80℃. If the temperature exceeds 80℃ and remains for a long time, the PE film will become soft, shrink in size (typically by 1-3%), and even become sticky.

The two issues you have encountered are very typical in the die-cutting process of PE release film. I will explain the reasons and solutions separately. Dimensional shrinkage problem: The PE material itself has a relatively strong elasticity. After cutting, the product undergoes shrinkage. The most common reason for this is during the laminating process.

First, the base material itself. Polyethylene (PE) is one of the commonly used plastics in the food contact field. It has high chemical stability and is inert. Food-grade PE complies with standards such as China's GB 4806.7-2016 and the US FDA 21 CFR. Under normal usage conditions, it will not undergo chemical reactions with food. PE itself does not contain plasticizers and has a stable molecular structure.

Common environmental protection requirements include: RoHS - the EU's restriction on harmful substances (lead, mercury, cadmium, etc.) in electronic and electrical products; REACH - registration and restriction of high-concern substances (SVHC); Halogen-free standards - limiting the content of chlorine, bromine, etc. halogens; California Proposition 65 - the carcinogenicity regulation in California, USA.

Now let's talk about the storage conditions: Store in a dry and clean warehouse at a temperature below 45℃; Prevent direct sunlight exposure as ultraviolet rays will cause PE to yellow and silicone oil to age; Keep away from smoking and heating; The humidity should not be too high, preferably controlled below 70%.