In this issue, we will talk about PVC heat shrink film. PVC shrink film is mainly divided into two categories, one is PVC packaging film, and the other is PVC printing film.
PVC packaging film is cylindrical in shape, and the shrinkage rate is generally 45% in the horizontal direction and about 25% in the vertical direction. It is mainly used for packing cartons, water pipes and other products with low requirements. It mainly plays the role of dustproof, waterproof, and anti-dispersion. The price is relatively low Low.
PVC printing film, also known as PVC sheet material, as the name suggests, this material is mainly used for printing, can print patterns of different colors, the shrinkage rate is 45%-50% in the horizontal direction and 0-3% in the vertical direction, the material requirements It is higher than the packaging film, and the flatness is better than the packaging film, and the relative price is also higher.
PVC material is a non-crystalline material. PVC materials are often added with stabilizers, lubricants, auxiliary processing agents, colorants, impact agents and other additives in actual use. PVC material has non-flammability, high strength, resistance to climate change and excellent geometric stability. PVC has strong resistance to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, and it is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons. The melting temperature of PVC is a very important process parameter during processing. If this parameter is improper, it will lead to the problem of material decomposition. The flow characteristics of PVC are quite poor, and its process range is very narrow. In particular, PVC materials with large molecular weight are more difficult to process (such materials usually need to add lubricants to improve flow characteristics), so PVC materials with low molecular weight are usually used. The shrinkage rate of PVC is quite low, generally 0.2~0.6%.
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