A Plastic Hopper Dryer is an essential auxiliary equipment in injection molding machines used to remove moisture from plastic resins before processing. Proper drying is crucial to prevent defects such as bubbles, silver streaks, and poor mechanical properties in molded products.
Key Features & Working Principle
A hopper dryer functions by blowing heated air through the plastic granules in a drying hopper, effectively reducing moisture content before the material enters the injection molding machine.
- Hot Air Circulation:
- Temperature Control:
- Stainless Steel Construction:
- Auto-Loaders Integration:
Heated air is forced through the plastic pellets, removing moisture.
The air then exits through a vent, carrying away evaporated moisture.
Equipped with adjustable thermostats to set the ideal drying temperature based on plastic type.
Inner walls are typically stainless steel to prevent contamination and ensure durability.
Many hoppers can be connected to automatic loaders for continuous feeding into the molding machine.
Advantages of Using a Hopper Dryer
✅ Prevents Moisture-Related Defects
✅ Improves Product Quality & Strength
✅ Enhances Injection Molding Consistency
✅ Energy Efficient with Insulation
✅ Reduces Waste & Increases Productivity
Choosing the Right Hopper Dryer
When selecting a plastic hopper dryer for an injection molding machine, consider:
- Hopper Capacity (5kg to 1000kg based on production volume)
- Drying Temperature Range (Match the plastic resin’s requirement)
- Energy Efficiency & Insulation (Reduces power consumption)
- Built-in Overheat Protection (Prevents overheating damage)
- Dehumidifying Option (For hygroscopic materials like PET, Nylon)