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Molding Conditions / Predrying

Contents Introduction Safety Molding Machines Molding Conditions Recycling
Molding Characteristics Product Design Mold Design Countermeasures for Defects

Standard Conditions  Predrying  Condition Setting  Molding Cycle  Countermeasures for MD

List of DURACON® POM grades This page's PDF(0.97MB)

4. Molding Conditions

4.2 Predrying

Though DURACON® POM has a substantially low moisture absorption rate and the packaging bags are completely sealed, it is recommended to predry pellets before use. The allowable level for moisture absorption of molding pellets is usually 0.1% or less.

Predrying conditions

  • Standard: 80-90°C × 3-4 hours
  • When mold deposit may occur: 100-120°C × 3-4 hours

Notes

  • When the tray-type oven is used:
    Pellet accumulation thickness should be limited to 25 mm or less.
  • When the hopper dryer is used:
    Adjust the temperature and flow rate of hot air so that pellets are maintained at the recommended temperature.
    Maintain the duration time in the hopper at 3-4 hours or more.

Fig. 4-1 Pellet drying curve

 


Standard Conditions  Predrying  Condition Setting  Molding Cycle  Countermeasures for MD

Contents Introduction Safety Molding Machines Molding Conditions Recycling
Molding Characteristics Product Design Mold Design Countermeasures for Defects