이중 사출시 발행하는 Weld-line의 강도 연구
A study on the weld-strength in two-shot molding
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초록
In injection molding, many kinds of defects have occurred because of a characteristic of plastics injection molding. Weld line is one of the defects is formed when separated melt fronts recombine together during the mold filling stage. That is one of problems in injection molding. Weld lines in the appearance of plastics parts can deteriorate visible quality. And most importantly, the local mechanical strength in the weld line area can be significantly weaker. It could be one of the most problems for structural applications. In this study, the mold available two-shot-molding of same polymers have been designed, and a series of experiment about tensile strength in weld line area has been conducted using Taguchi's design of experiment to optimize injection molding conditions decreasing of weld strength and find out a factors affected weld strength in two-shot- molding.
Abstract
In injection molding, many kinds of defects have occurred because of a characteristic of plastics injection molding. Weld line is one of the defects is formed when separated melt fronts recombine together during the mold filling stage. That is one of problems in injection molding. Weld lines in the appearance of plastics parts can deteriorate visible quality. And most importantly, the local mechanical strength in the weld line area can be significantly weaker. It could be one of the most problems for structural applications. In this study, the mold available two-shot-molding of same polymers have been designed, and a series of experiment about tensile strength in weld line area has been conducted using Taguchi's design of experiment to optimize injection molding conditions decreasing of weld strength and find out a factors affected weld strength in two-shot- molding.
참고문헌 (7)
- Allen Y.Peng, "Prediction of the Weld-line-induced strength reduction for Injection-Molded Plastics Parts", ANTEC 2006, pp.719~722 (2006)
- Tomari, K., "Fracture Toughness of Weld lines in Thermoplastics Injection Molding", Polym. Eng. Sci., 30, pp.931~ (1993)
- Liu Chuntai, "The Influence of Meeting Angle on the Weld Line Strength in Injection Molded Short-fiber-reinforced Polyanide 66", ANTEC 2005, pp.879~883 (2005)
- TAO C. CHANG, "Optimization of Weld Line Quality in Injection Molding Using an Experimental Design Approach", Jounal of injection molding technology, 3(2), pp.61~66 (1999)
- Kevin R.Quinn, "Reinforced Thermoplastics : Understanding Weld Line Integrity", Jounal of injection molding technology, 1(2), pp.123~129 (1997)
- T. Semba, "Weld line strength in PC", ABS Injection Molding, 1999, pp.14(4), 365~
- Rover A. Malloy, "Plastics Part Design for Injection molding", pp.54~ (1994), Hanser public