Abstract
Warpage of injection molded product is caused by non-uniform shrinkage during shaping operation and relaxation of residual stress. Robust part design and glass fiber reinforced reins have been adopted to prevent warpage of part. Warpages for part designs have been investigated in this study according to the injection molding conditions. Part design contains flat specimen and two different rib designs in the flat part. Resins used in this study were glass fiber reinforced amorphous plastics, PC and ABS. Different rib designs showed significant differences of warpages in the parts. Various warpages have been observed in the three regions of the part, near gate region, opposite region to the gate, and flow direction region. Results of computer simulation revealed that the warpages were strongly related to glass fiber orientation. Flat specimen showed the smallest warpage and the specimen with ribs to the flow direction showed a high resistance to warpage. Warpage highly depended upon part design rather than molding condition. It was concluded that the rib design and selection of gate location in injection molding would be the most important factors for the control of warpage since those are directly related to the fiber orientation during molding.
| Original language | English |
|---|---|
| Pages (from-to) | 555-563 |
| Number of pages | 9 |
| Journal | Polymer (Korea) |
| Volume | 36 |
| Issue number | 5 |
| DOIs | |
| State | Published - Sep 2012 |
Keywords
- Glass fiber reinforced abs
- Glass fiber reinforced pc
- Injection molding
- Part design
- Rib design
- Warpage