POF shrink film, PE shrink film, and PVC shrink films have significant differences in cost, physical properties, cold resistance, processing performance, safety, and environmental protection.
Cost
POF shrink film: specific gravity 0.92, thinnest thickness 0.012mm, low unit cost.
PE shrink film: specific gravity 0.92, thickness usually above 0.03mm, high unit cost.
PVC shrink film : specific gravity 1.4, thickness about 0.02mm, high unit cost12.
Physical properties
POF : thin and tough, uniform thickness, good moisture resistance, soft texture. High tensile strength, high tear resistance, adjustable shrinkage, good rubbing resistance.
PE: thick and tough, good moisture resistance, soft texture. Tear resistance is lower than POF but higher than PVC, shrinkage adjustability is poor, and rubbing resistance is not as good as POF.
PVC: thick and brittle, uneven thickness, poor moisture resistance, hard and brittle texture. Low strength, low shrinkage, poor rubbing resistance 12.
Cold resistance
POF: Excellent cold resistance, can be neither hard nor brittle at -50℃, not easy to break, suitable for frozen food packaging.
PE: Excellent cold resistance, does not harden or become brittle in winter or after freezing, and is not easy to break during transportation.
PVC: Extremely poor cold resistance, easy to become brittle in winter or after freezing, and easy to break during transportation 2.
Processing performance
POF: No moisture is generated during the processing process, and it does not stick to the sealing rod, which is suitable for automatic packaging on high-speed production lines.
PE: No moisture is generated during the processing process, and it does not stick to the sealing rod, which is suitable for automatic packaging on relatively high-speed production lines.
PVC: Volatile components are generated during the processing process, which is easy to stick to the sealing rod, making the operation inconvenient and difficult to maintain 2.
Safety and environmental protection
POF: Non-toxic, no toxic odor is generated during processing, and it meets the standards of the US FDA and USDA.
PE: Non-toxic, no toxic gas is produced during processing.
PVC: Toxic, odor and toxic gas are produced during processing, and it is gradually being banned
