Why is blown PVC shrink film not suitable for long-term storage?

When we talk about packaging materials, PVC (polyvinyl chloride) shrink film is a common and widely used option. It is favored for its high transparency, good toughness and heat shrinkability. However, despite its many advantages, blown PVC shrink film is not suitable for long-term storage.

We need to understand the basic properties of blown PVC shrink film. PVC is a thermoplastic that can be softened and reshaped by heating. However, this material may face some problems during long-term storage.

Aging phenomenon: After long-term storage, blown PVC shrink film may be affected by air, light, temperature and other factors, causing aging phenomena. Aging will cause the physical properties of materials to decline, such as becoming brittle, hard, and reducing transparency. This will affect the packaging effect and aesthetics of blown PVC shrink film.

Adhesion and deformation: During the storage process of blown PVC shrink film, if the storage conditions are improper (such as excessive temperature, excessive humidity, etc.), it may cause adhesion between the film layers, making it difficult to separate the film rolls. In addition, long-term storage may also cause the blown PVC shrink film to deform, affecting its use effect.

Degradation and release of harmful substances: During the production and storage process of blown PVC shrink film, it may be affected by some unstable factors, such as oxidation, hydrolysis, etc. These factors may cause the PVC molecular chain to break, thereby releasing harmful substances. These harmful substances may cause potential harm to the environment and human health.

Therefore, while blown PVC shrink film performs well during short-term packaging and shipping, it is not suitable for long-term storage. If you need to store products for a long time, it is recommended to choose other more suitable packaging materials, such as metal cans, glass bottles or degradable plastics. These materials can maintain good physical properties and chemical stability during long-term storage, thereby better protecting products and reducing environmental pollution.