The substrates for pre-coated films are primarily biaxially oriented polypropylene (BOPP) film and polyester (PET) film. BOPP film, due to its flexibility, non-toxicity, high transparency, and low cost, is considered an ideal composite material in lamination processes. The substrate thickness is typically 12-20 micrometers, and the adhesive layer thickness is 5-15 micrometers.
The production of pre-coated films mainly includes the following steps: substrate production (e.g., PET substrate prepared through extrusion and biaxial stretching processes), hot melt adhesive coating (using high-precision coating equipment to uniformly coat the adhesive layer onto the substrate surface), lamination (using high-temperature heating to firmly bond the adhesive layer to the substrate), and roll cutting (high-precision cutting into finished rolls according to requirements).
Laminators directly use the pre-coated film with pre-applied adhesive, laminating it with paper printed materials within seconds using lamination equipment through heating and pressure. This process eliminates the on-site mixing, coating, and drying steps of the adhesive in the immediate coating process, thus possessing core advantages such as simple operation, high efficiency, no solvent evaporation, no VOC pollution, no fire hazard, and stable film quality (reducing bubbles and delamination).
