Unknowingly today again on Saturday, Dongguan Plastic mold factory editor for everyone to introduce the plastic mold in the molding characteristics of ABS analysis. ABS is polystyrene modified products, is the largest output, the most widely used engineering plastics. ABS is opaque non-crystalline polymer, non-toxic, tasteless, the density of 1.02 ~ 1.05g / cm3.
ABS has outstanding mechanical properties, strong, tough, hard; has a certain chemical properties and good dielectric properties; with good dimensional stability, easy molding and machining, forming plastic surface has a better gloss, after Color can be dubbed any color, the surface can be chrome. The shortcomings are poor heat resistance, continuous working temperature of about 70 ℃, heat distortion temperature of 93 ℃ or so, but the heat distortion temperature than polystyrene, polyvinyl chloride, nylon and so are high; weatherability is poor, under the effect of ultraviolet light Hard and brittle
ABS molding performance is as follows:
(1) easy to absorb water, molding should be dry before processing, surface gloss requirements of plastic parts should be a long time preheat dry.
(2) medium liquidity, overflow edge value of 0.04mm or so
(3) wall thickness and melt temperature on the impact of minimal impact, plastic parts of high precision
(4) low specific heat capacity, high plasticizing efficiency, solidification is also fast, so the molding cycle is short.
(5) apparent viscosity dependence on the shear rate is very strong, so most of the mold design using point gate form.
(6) easy to produce weld marks, mold design should pay attention to minimize the casting system on the flow resistance.
(7) should be used high temperature, high mold temperature, high injection pressure molding. In the requirements of high precision plastic parts, the mold temperature can be controlled at 50 ~ 60 ℃; and in emphasizing the plastic parts of luster and heat, the mold temperature should be controlled 60 ~ 80 ℃.
(8) the overhead force is too large or mechanical processing of plastic surface will leave a white mark, stripping slope easy to take more than 2 °.
Note: The above information is chaired by Jiezheng on the Internet, welcome reproduced, indicate the source!