What is the difference between PVC soft plastic bags and PVC plastic bags?

pvc软胶袋有较多的增塑剂,柔软有些弹性。

PVC soft plastic bags have more plasticizers, making them soft and somewhat elastic.

pvc塑料袋增塑剂较少,有时不加增塑剂。

PVC plastic bags have fewer plasticizers, sometimes without plasticizers.

PVC （聚氯乙烯）化学和物理特性 刚性PVC是使用最广泛的塑料材料之一。PVC材料是一种非结晶性材料。 PVC材料在实际使用中经常加入稳定剂、润滑剂、辅助加工剂、色料、抗冲击剂及其它添加剂。

Chemical and physical properties of PVC Rigid PVC is one of the most widely used plastic materials. PVC material is a non crystalline material. PVC materials are often used with stabilizers, lubricants, auxiliary processing agents, colorants, impact resistant agents, and other additives.

PVC材料具有不易燃性、高强度、耐气侯变化性以及优良的几何稳定性。 PVC对氧化剂、还原剂和强酸都有很强的抵抗力。然而它能够被浓氧化酸如浓硫酸、浓硝酸所腐蚀并且也不适用与芳香烃、氯化烃接触的场合。

PVC materials have non flammability, high strength, weather resistance, and excellent geometric stability. PVC has strong resistance to oxidants, reducing agents, and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, and is not suitable for situations where it comes into contact with aromatic and chlorinated hydrocarbons.

PVC在加工时熔化温度是一个非常重要的工艺参数，如果此参数不当将导致材料分解的问题。 PVC的流动特性相当差，其工艺范围很窄。特别是大分子量的PVC材料更难于加工（这种材料通常要加入润滑剂改善流动特性），因此通常使用的都是小分子量的PVC材料。 PVC的收缩率相当低，一般为0.2~0.6%。

The melting temperature of PVC during processing is a very important process parameter, and if this parameter is not appropriate, it will lead to material decomposition issues. The flow characteristics of PVC are quite poor, and its process range is very narrow. In particular, PVC materials with large molecular weights are more difficult to process (such materials typically require the addition of lubricants to improve flow characteristics), so PVC materials with small molecular weights are commonly used. The shrinkage of PVC is relatively low, typically 0.2 to 0.6%.

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