Shrink tunnels complete the heat shrink wrapping of products after film lamination, solving problems such as shrinkage wrinkling, uneven heating, loose film material, and speed mismatch. Compatible with various film materials such as PE, PVC, and PET, it covers scenarios such as bottle labeling, whole carton wrapping, gift box sealing, and product moisture-proof packaging. It can be integrated with front-end sealing and labeling equipment, providing stable heat shrink packaging solutions for industries such as food, daily chemicals, pharmaceuticals, and e-commerce.

The core working principle of shrink tunnels is based on the molecular memory effect of thermoplastic shrink films: during the production process, shrink films such as PVC, POF, and PE are stretched and oriented, and the polymer molecular chains are elongated and locked in a high-energy state; when the film is heated in the heating furnace to reach the glass transition temperature, the molecular chains regain fluidity and spontaneously retract to the original relaxed state, thereby driving the film to tighten evenly along the product contour, closely adhering to the product surface, and finally forming a flat and tight packaging effect.