PVC is polyvinyl chloride, and the plasticizing temperature is generally around 175 degrees. However, the configuration and design of the screw and barrel must also be considered.

The English name of polyvinyl chloride :Poly(Vinyl Chloride) Specific gravity: 1.38 g/cm3 Molding shrinkage: 0.6-1.5% Molding temperature: 160-190℃ Features: Mechanical properties, excellent electrical properties, strong acid and alkali resistance, good chemical stability, but Low softening point. Suitable for making thin plates, wire and cable insulation layers, seals, etc. Polymer of vinyl chloride. The English abbreviation PVC. The structure is polyvinyl chloride, which is the second largest plastic variety after polyethylene. The glass transition temperature is 80~85℃, the density is 1.35~1.45 g/cm, and the operating temperature is - 15~60℃. PVC has excellent acid and alkali resistance, wear resistance, flame resistance and insulation properties. It has good mixability with most plasticizers, so it can greatly change the mechanical properties of the material. It has excellent processing performance and low price, but has poor light and thermal stability, and its performance drops rapidly above 100°C or under light. PVC, also known as hard PVC, is an amorphous thermoplastic resin made from the polymerization of vinyl chloride monomer plus certain additives (such as stabilizers, lubricants, fillers, etc.). In addition to using additives, it also adopts the method of mixing and modifying with other resins, making it of obvious practical value. These resins include CPVC, PE, ABS, EVA, MBS, etc. The melt viscosity of UPVC is high and the fluidity is poor. Even if the injection pressure and melt temperature are increased, the fluidity does not change much. In addition, the molding temperature of resin is very close to the thermal decomposition temperature, and the molding temperature range is very narrow, making it a difficult material to mold. Physical and chemical properties 1. Amorphous material, low moisture absorption, poor fluidity. In order to improve fluidity and prevent bubbles, the plastic can be pre-dried. The mold pouring system should be thick and short, the gate cross-section should be large, and there should be no dead corners. The mold must be cooled and the surface Chrome plating. 2. Due to its corrosive and fluid characteristics, it is best to use special equipment and molds. All products must add different types and quantities of additives as needed. 3. It is very easy to decompose. It is more likely to decompose when in contact with steel and copper at a temperature of 200 degrees. It will release corrosive and irritating gases during decomposition. The molding temperature range is small. 4. When using a screw injection machine nozzle, the hole diameter should be large to prevent Material is stuck in dead corners. It is best not to use inserts. If there are inserts, they should be preheated. Chemical and physical properties Rigid PVC is one of the most widely used plastic materials. PVC material is an amorphous material. Stabilizers, lubricants, auxiliary processing agents, colorants, impact agents and other additives are often added to PVC materials in actual use. PVC material is non-flammable, high strength, resistant to climate changes and has excellent geometric stability. PVC is highly resistant 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 in which it comes into 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 material decomposition problems. 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 (lubricants are usually added to this material to improve flow characteristics), so PVC materials with small molecular weights are usually used. The shrinkage rate of PVC is quite low, generally 0.2~0.6%.