1. amorphous substance with low hygroscopicity and poor fluidity. In order to improve the fluidity and prevent bubbles, the plastic can be dried in advance. The mold pouring system shall be thick and short. Attention shall be paid to the bag type dust removal accessories. The gate section shall be large without dead corners. The mould shall be condensed and the surface shall be chrome plated.
2. due to the perishability and fluidity of PVC board, it is better to use special equipment and molds. All products must be added with different types and quantities of additives as required.
3. it is very easy to distinguish. It is easier to distinguish when it is in contact with steel and copper at 200 ℃, and there is decay gas escaping during the differentiation process. The forming temperature range is small.
4. when using the nozzle of screw injection machine, the hole diameter should be large to prevent dead corner stagnation. If there is an insert, it should be preheated.
PVC board is a kind of synthetic material which is deeply loved, popular and widely used in the contemporary world. Its global application rate ranks No.2 among various synthetic materials. According to statistics, in 1995 alone, the output in Europe was about 51million tons, while the consumption of its ceramic tile press was 5.3 million tons. In Germany, the output and consumption of PVC is equivalent to 1.4 million tons. PVC is produced and applied worldwide at a growth rate of 0.04. In recent years, PVC board has increased significantly in Southeast Asia, thanks to the urgent need of infrastructure construction in Southeast Asian capitals. The pipe fitting "copper alloy seamless pipe" has been rated as the international advanced ancestor level. PVC is suitable for producing three-dimensional surface films.
Specific gravity: 1.38g/cm3, forming shrinkage: 0.6-0.015, forming temperature: 160-190 ℃.
These are the characteristics of the forming characteristics of PVC board. Because of its excellent mechanical and electrical properties. Strong acid and alkali resistance, good chemical stability, but low soft point. Therefore, it is suitable for making thin plates, wire and cable insulation layers, seals, etc.
