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What are the main performance requirements of plastic mould?(1)

What are the main performance requirements of plastic mould?(1)

liuweiqiong liuweiqiong 2017-09-29 20:30:07
1. heat resistance, with the emergence of high-speed molding machinery, plastic products production speed up. As the molding temperature is generally between 160~350 degrees, some of the liquidity is not good, forming speed and speed, will make the mold part of the molding, surface temperature in a very short period of time more than 400 degrees. When the mold work temperature is higher, will cause the mold hardness and the strength to drop, causes the mold early wear or produces the plastic distortion to be invalid. In order to ensure the accuracy and deformation of the die in use, die steel should have higher heat resistance. In order to reduce temperature rise, die steel should have good thermal conductivity and lower thermal expansion coefficient.


2. at the working temperature with sufficient temperature, the working conditions of the mold are very bad, and some of them often bear a larger load, which leads to brittle fracture. Extrusion molding pressure is large, generally 10~35MPa. Therefore, in order to prevent the die parts from breaking suddenly at work, the mold must have higher strength and toughness.


3. wear resistance with the expansion of plastic products used in plastic, often need to add inorganic materials such as glass fiber reinforced plastic additives due to, to join, so that liquidity plastic is greatly reduced, resulting in die wear, the mold has good abrasion resistance.

4. corrosion resistant fire resistant agent and polyvinyl chloride added in ABS resin, in the molding process may emit corrosive gases, and sometimes damaged die rust in the air channel outlet, it requires a good corrosion resistance of die steel.