Why is PVC heat shrinkable film easier to break?

PVC heat-shrinkable film is a very common packaging material in the current packaging market. It is often used in cosmetics, stationery, doors and windows, aluminum alloy outer packaging and packaging of various stainless steel tubes. Because PVC shrink film has good shrinkage and stretching force, and the packaging is simple and easy to operate, it can be tightly fixed on the surface of the product only by heating with a high-power blower or a semi-automatic and fully automatic heat shrinking machine. However, some PVC shrink film packaging products are easy to break when touched. What is the reason? I think there are four main reasons:

1. The quality of the shrink film itself; improper temperature adjustment during the production process, product quality is unstable, poor resistance, and easy to break;

2. The shrink film is too thin; some businesses will require the manufacturer to make the shrink film very thin in order to save packaging costs, but the thinner shrink film shrinks too much and is easy to break

3. The temperature and time are not well controlled during heating, resulting in unqualified products and easy breakage;

4. This product is not a brand-new material, but is produced from recycled materials or added with recycled materials, with low tensile force and easy to break.