# 전열을 이용한 금형가열코어의 제작 및 이를 이용한 성형품의 제조와 평가

• 김동학 (순천향대학교 나노화학공학과) ;
• 류지원 (순천향대학교 나노화학공학과) ;
• 손영곤 (공주대학교 신소재공학부)
• Published : 2006.08.01
• 38 12

#### Abstract

In this study we developed the electrical heating mold core by applying three different heating methods. In order to find out the optimal heating method, we observed the temperature profiles with time. We also injection-molded the parts by the heating methods and investigated the shrinkage ratio, density, surface roughness and weld-lines. The temperature rise time and cycle time showed the promising results for commercial applications(the rise time is $130^{\circ}C$/14sec, the cycle time is 55sec). By comparing with the conventional and gas flame heating method, the parts by this method were proven to have good qualities. The shrinkage ratio reduced by 5.1%, the density increase by 2.66%, the smoothness increased about 3 times, and the weld-line did not observed by naked eyes.

#### Keywords

the electrical heating;mold core;injection molding;weld line