1. Low melting point, white transparent (excluding colored) appearance is better;

2. High transparency and high-quality hot-melt film, good hot-melt film has good elasticity;

3. High transparency (excluding colored ones) with good quality;

4. Transparent hot melt film with sixteen or more layers appears milky white and shiny;

5. The width of the qualified hot melt film shall not be less than the specified width, with a thickness error within ± 0.1mm and a length error within ± 3%;