ABS plastic injection molding properties, processing industry recommendations
Click： Time：2021-11-08 11:49:10
ABS plastic injection molding: amorphous plastic, fluidity (about 20) medium, moisture absorption, must be fully dry, the surface requires glossy plastic parts must be preheated and dried for a long time 80-90 degrees, 3 hours; our LG chemical ABS plastic 181 can achieve (dissolved fat 40-48) high flow, fluidity is about twice as much as to improve productivity, reduce the weight of single injection molded parts, energy saving, improve design Freedom, reduce residual internal stress, improve the smoothness of the surface of the injection molded parts, improve the fusion point.
ABS plastic injection molding process is suitable for high material temperature, high mold temperature, but the material temperature is too high easy to decompose (decomposition temperature of > 270 degrees). For higher precision plastic parts, mold temperature should be taken 50-60 degrees, for high gloss. For heat-resistant plastic parts, the mold temperature should be 60-80 degrees;
Decide to clip water lines, need to improve the fluidity of the material, take high material temperature, high mold temperature, or change the water level and other methods;
Such as molding heat-resistant grade ABS plastic or flame-retardant grade material ABS plastic injection molding, the production of 3-7 days after the mold surface will be residual ABS plastic decomposition, resulting in mold surface shiny, the need for timely cleaning of the mold, at the same time, the mold surface needs to increase the exhaust position;
ABS plastic injection cooling speed, mold pouring system should be coarse, short for the principle, it is desirable to set up a cold material hole, the gate is desirable to take a large, such as: direct gate, disc gate or fan gate, etc., but should be prevented from increasing internal stress, if necessary, can be adjusted to use the type of gate. The mold should be heated, and wear-resistant steel should be used;
At the same time, the material temperature has a greater impact on the quality of plastic parts, the material temperature is too low will cause the lack of material, the surface has no luster, the silver wire is disordered material temperature is too high is easy to overflow the edge, the appearance of the silver wire dark bars, the plastic parts discoloration blistering;
Mold temperature has a great impact on the quality of plastic parts, mold temperature is low when the shrinkage, elongation, impact strength, bending, compression, tensile strength is low. Mold temperature exceeds 120 degrees, the plastic parts cooling slow, easy to deformation sticky mold, mold release difficulties, long molding cycle;
ABS plastic injection molding shrinkage is small, easy to melt cracking, resulting in stress concentration, so the molding should be strictly controlled molding conditions, molding plastic parts should be annealed after treatment;
For high melt temperature, high viscosity, insensitive to shear action, for plastic parts larger than 200 grams, should be used screw injection machine, the nozzle should be heated, it is desirable to use the open smooth type extension type nozzle, injection speed in high speed.
