For example, what raw materials and plasticizers need to be added in the production process. PVC is divided into many models according to the degree of polymerization. The domestic PVC brand names generally use the degree of polymerization or type designation. The production of PVC transparent sheet should use Type 7 PVC (brands: S-800, SG-7) or Type 8 PVC (brands: S-700, SG-8). The labeling varies from manufacturer to manufacturer, and SG is generally used. The ones marked with single digits represent the PVC model, and those marked with hundreds and thousands digits represent the degree of polymerization (mainly look at the number, the same number represents the same product, such as Qingdao Haijing HS1000, Shanghai Chlor-Alkali WS1000, Qilu Petrochemical S1000 stands for Type 5 PVC). There are more sheet materials in East China. Generally, products from Qilu Petrochemical, Shanghai Chlor-Alkali, Canghua, Qingdao Haijing, and Dagu Chemical are used. In South China, you can consider Fuer Chemical's products.
Type 7 and Type 8 PVC have a low degree of polymerization and are easy to process, so they are mostly used in the production of sheets and injection-molded pipe fittings. As far as national standards are concerned, PVC is divided into eight types, namely type 1 to type 8. The current market circulation is mostly type three (polymerization degree 1300, mostly used in the manufacture of wire and cable, calendered film), type five (polymerization degree 1000, mostly used for profiles, pipes), and type seven and eight.
The sheet formula should be relatively simple, with fewer processing aids.
In general, the formula is the above, but the equipment is different, the formula is also different, especially for lubrication, you still have to make adjustments yourself. Those who have done processing should know that adjusting lubrication is very painful. It is recommended that you find a lubricant supplier, because they have a deep understanding of their own lubricants, so they are certain about the amount of lubricant (generally G16 is between 0.6-1.2 and 70S is between 0.3-0.5).