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Molding Characteristics / Mold Shrinkage
6. Molding Characteristics
6.2 Mold Shrinkage

Fig. 6-5 Mold shrinkage of M90-44 (side gate) |

Fig. 6-6 Mold shrinkage of M90-44 (pin gate) |
Molding conditions:
Injection pressure: 50MPa
Cylinder temp.: 190°C
Mold temp.: 80°C
Injection speed: 50mm/s
Mold: 80×80mm flat plate |
Molding conditions:
Cylinder temp.: 190°C
Mold temp.: 80°C
Injection speed: 17mm/s
Mold: 50×50mm flat plate
Pin gate: 1.0mm dia. |
Table 6-1 Relation of molding conditions and mold shrinkage
|
Change |
Mold shrinkage |
After-shrinkage |
Walk thickness |
↑ Thick |
↑ Large |
↓ Small |
Gate size |
↑ Large |
↓ Small |
|
Mold temperature |
↑ High |
↑ Large |
↓ Small |
Material temperature |
↑ High |
↑ Large |
|
Holding pressure |
↑ High |
↓ Small |
|

Fig. 6-7 Relationship between injection
pressure and mold shrinkage |

Fig. 6-8 Relationship between material
temperature and mold shrinkage |

Fig. 6-9 Relationship between mold
temperature and mold shrinkage |
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