Abstract
Part shrinkage in injection molding is inevitable phenomenon. Thus, it is necessary not only study on thereducing part shrinkage but characterization of part shrinkage. In this study, part shrinkage in injection molded 2.5 dimensionalannular shaped specimens has been studied using glass fiber reinforced PC. Annular shaped specimens were designed withvarious sizes of outer diameter and thickness. Injection temperature, packing time and packing pressure were selected foroperational conditions. Profile variations of outer and inner diameters of molded specimens for various operational conditionswere investigated. Sizes of outer and inner diameters of injection molded specimens were smaller than the sizes of mold.
Part shrinkage decreased as outer diameter and thickness increased. Part shrinkage showed anisotropic behavior and it dependedupon gate location. Subsequently, molded specimens were not circular but oval in shape, and showed the largest shrinkagein the direction of gate. It was realized that the mold design such as gate design is important to control the shape ofmolded products.
Part shrinkage decreased as outer diameter and thickness increased. Part shrinkage showed anisotropic behavior and it dependedupon gate location. Subsequently, molded specimens were not circular but oval in shape, and showed the largest shrinkagein the direction of gate. It was realized that the mold design such as gate design is important to control the shape ofmolded products.
| Translated title of the contribution | A Study on the Part Shrinkage in Injection Molded Annular Shaped Product for Glass Reinforced Polycarbonate |
|---|---|
| Original language | Korean |
| Pages (from-to) | 300-305 |
| Number of pages | 6 |
| Journal | 엘라스토머 및 콤포지트 |
| Volume | 48 |
| Issue number | 4 |
| DOIs | |
| State | Published - Dec 2013 |