Plastic hopper dryers machines are mainly used in the plastic shoe industry to dry plastic raw materials to remove moisture and volatiles from the raw materials and ensure the production quality and performance of plastic shoes. The following are its specific applications:
Raw material drying
Commonly used raw materials for plastic shoes, such as polyvinyl chloride (PVC), thermoplastic polyurethane elastomer (TPU), ethylene-vinyl acetate copolymer (EVA), etc., are easy to absorb moisture in the air during storage and transportation. The presence of moisture will cause a series of problems in the plastic processing process, such as causing bubbles and silver streaks in the plastic melt, reducing the mechanical and electrical properties of the plastic, and may also affect the mixing uniformity of the plastic with other additives. The plastic hopper dryer machine reduces the moisture in the raw materials to a suitable level by heating and ventilation. Generally, the moisture content of the plastic raw materials is required to be controlled below 0.1% to meet the quality requirements of shoe production. For example, when producing PVC plastic shoes, using a
hot air circulation plastic hopper dryer machine to dry the PVC particles to reduce their moisture content can effectively avoid bubbles and surface defects during the injection molding process and improve the appearance quality of the product.
Improve processing performance
The dried plastic raw materials have better fluidity, and can fill the mold or pass through the extruder head more smoothly during injection molding, extrusion and other processing processes, improving processing efficiency and product molding accuracy. At the same time,
plastic hopper drying machine can also reduce the viscosity of plastics, reduce energy consumption during processing, and extend the service life of processing equipment. Taking EVA sole production as an example, the dried EVA raw materials can better foam and expand during the foaming process to form a uniform pore structure, thereby improving the elasticity and comfort of the sole.
Stabilize product quality
Removing moisture and volatiles from the raw materials can make the performance of plastics more stable during the processing process and reduce product quality fluctuations caused by factors such as moisture. This helps to improve the dimensional stability, physical and mechanical properties, and aging resistance of plastic shoes, ensure that product quality meets standard requirements, and reduce the defective rate. For example, when producing TPU plastic shoes, the hardness, tensile strength and other properties of the dried TPU raw materials are more stable after injection molding, which can better meet the needs of different customers.
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