Drying process of plastic raw material
4 drying equipmentDrying equipment has hot air hopper dryer, hot air circulation oven and far infrared ray dryingBox, in which hot air hopper dryer is a common equipment, can achieve continuous feeding movementsTo avoid re absorption of moisture, can greatly shorten the ten dry hours. Hot air hopper - ten dryerPoints for attention are as follows.If the hot air temperature is too high, the lower part of the hopper will melt into the plastic, which will affect the hot airUniform blowing, seriously affecting the smooth entry of plastic into the machine.When converting raw materials or colors, be sure to clean them carefully and heat them when necessaryAir distributor interior.
3., plastic raw materials pre drying on the role of injection molding productsThe pre drying of raw materials has a significant impact on the quality of injection molding products, especially for engineering plastics,It can improve the surface gloss, improve the bending strength, tensile strength, and avoid internal cracksAnd bubbles to improve plasticizing capacity and shorten molding cycle.
2. the two forms of moisture in plastic raw materials(1) absorb moisture into the interior of the matrix, such as ABS.(2) the surface has moisture, and the moisture just covers the surface of the matrix and seldom penetrates into the baseIn the body, such as PP, HIPS.
Drying of plastic raw materials1. definition of plastic dryingRemove the moisture in the plastic material when the plastic is heated continuously without deformationAnd other readily vaporized substances, this process is called drying.
