1. Material thickness. Determine the thickness of the film material according to the application field, cost, film characteristics, shrinkage performance, printing process and labeling process requirements of the heat shrinkable label. It is generally required that the thickness of the film used to make shrink film labels should be 30-70 microns. Commonly used film specifications are 40 microns and 50 microns.

2. Material shrinkage rate. Generally, the shrinkage rate of the film is required to be within the application range, and the transverse direction (TD) shrinkage rate is higher than the longitudinal direction (MD) shrinkage rate. The transverse shrinkage rate of commonly used materials is 50%-52% and 60%-62%, and can reach 90% under special circumstances. The longitudinal shrinkage is required to be 6% to 8%. When making shrink film labels, try to choose materials with small longitudinal shrinkage.

3. Environmental protection of materials. The materials used for heat shrinkable film are mainly various thermoplastic films. At first, PVC shrink film was mainly used. With the continuous development of market demand, PVC (polyvinyl chloride) shrink film gradually decreased, and various types of PE, PP, PET (polyester), PETG (modified polyester), PVDC, OPS (Oriented polystyrene), OPP, POF and other multi-layer co-extruded heat shrinkable films have developed rapidly and become the mainstream of the market. They have their own characteristics in terms of shrinkage characteristics and environmental protection.