Introduce the three components of plastic bags

　　1、合成树脂

　　1, synthetic resin,

　　Synthetic resin is the main element of the plastic, the content is in commonly 40% ~ 40% in plastic. And, because of the large content of resin and often determine the nature of the properties of plastic, so people often put the resin as a synonym for plastic.

　　例如把聚氯乙烯树脂与聚氯乙烯塑料、酚醛树脂与酚醛塑料混为一谈。其实树脂与塑料是两个不同的概念。

　　Such as PVC resin and PVC plastic, phenolic resin and phenolics confuse STH with STH else. Actually, resins and plastics are two different concepts.

　　树脂是一种未加工的原始聚合物，它不仅用于制造塑料，而且还是涂料、胶粘剂以及合成纤维的原料。而塑料除了极少一部分含100％的树脂外，绝大多数的塑料，除了主要组分树脂外，还需要加入其他物质。

　　Resin is a kind of unprocessed raw polymers, it not only used to make plastics, and coatings, adhesives and synthetic fiber materials. And plastic in addition to very few part of the resin containing 100%, the vast majority of plastic, in addition to the main components of resin, also need to join other substances.

　　2、填料

　　2, packing

　　填料又叫填充剂，它可以提高塑料的强度和耐热性能，并降低成本。例如酚醛树脂中加入木粉后可大大降低成本，使酚醛塑料成为最廉价的塑料之一，同时还能显著提高机械强度。

　　Packing and filling agent, it can improve the strength and heat resistance of plastics, and reduce costs. Such as phenolic resin after adding wood powder can significantly reduce costs, make the phenolic plastic become one of the most cheap plastic, at the same time also can significantly improve the mechanical strength.

　　填料可分为有机填料和无机填料两类，前者如木粉、碎布、纸张和各种织物纤维等，后者如玻璃纤维、硅藻土、石棉、炭黑等。

　　Packing can be divided into two categories, organic filler and inorganic filler, such as wood powder, and cloth, paper, and a variety of fabric, etc., the latter such as diatomite, asbestos, glass fiber, carbon black, etc.

　　3、增塑剂

　　3, plasticizer,

　　增塑剂可增加塑料的可塑性和柔软性，降低脆性，使塑料易于加工成型。增塑剂一般是能与树脂混溶，无毒、无臭，对光、热稳定的高沸点有机化合物，最常用的是邻苯二甲酸酯类。

　　Plasticizer can increase plastic plasticity and softness, reduce the brittleness, easy plastic processing and molding. Plasticizer is commonly miscibility with resin, non-toxic, odourless, optical and thermal stability of high boiling point of organic compounds, the most commonly used is phthalic acid esters.