Injection molding machines typically do not have built-in drying systems for plastic materials. Drying is a separate process that is usually performed using auxiliary equipment called "material dryers" or "resin dryers." These dryers are not integrated into the injection molding machine itself but are standalone units that are connected to the machine's material handling system.

Here's how the drying process typically works in conjunction with an injection molding machine:
1.Material Preparation: Before plastic pellets or granules are fed into the injection molding machine, they must be properly dried if they are moisture-sensitive materials like nylon, ABS, or PET. Moisture in the material can cause defects and reduce the quality of the final parts.
2.Material Dryer: The plastic material is loaded into a material dryer, which uses heated air to remove moisture from the material. The drying temperature and duration depend on the material being processed and its moisture content.
3.Material Loading: Once the material is sufficiently dried, it is transferred from the dryer to the injection molding machine's hopper or material feed system. Some injection molding machines may have integrated hoppers and material loaders for convenience.
4.Injection Molding: The injection molding machine processes the dry material by heating it to the appropriate melting temperature and injecting it into the mold cavity to create the desired part.
5.Material Handling: Any unused material that remains in the machine's hopper can be returned to the material dryer for reuse in subsequent molding cycles.

The use of a separate material dryer ensures that the plastic material is free from moisture, which is critical for maintaining the quality and consistency of molded parts. Moisture in the material can lead to defects like splay, voids, and surface imperfections in the final parts.

It's essential to follow the material manufacturer's recommendations for drying parameters, as different materials have varying moisture sensitivity levels and drying requirements. The drying process is an important part of preparing plastic materials for injection molding, and it helps ensure the overall success of the molding process.