IMPROVE WELD LINE PROBLEM OF PUSH BOTTOM MADE FROM ABS MATERIAL WITH RAPID HEATING AND COOLING MOLD TEMPERATURE
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Abstract
In improving quality of parts made by the plastic injection molding process, one method that can help solving the weld line problem and improving quality of the surface of plastic products is the use of rapid heating and cooling system. The rapid heating and cooling system was applied to increase efficiency of the cooling system in plastic injection molding by heating the mold to rapidly increase the mold temperature to glass transition temperature (Tg) while injecting plastic in the cavity in the filling process. Then rapidly apply the cooling process to improve weld line on the product. The prototype product is the unlock button of the car hand brake, which has 2.3 mm thickness and gloss surface. The experiment which applies the rapid heating and cooling system can decrease weld line up to 80% and increase gloss surface.
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