5 Key Points for TPU Injection Molding
TPU (Thermoplastic Polyurethane) is widely used in various industries due to its excellent elasticity, abrasion resistance, and oil resistance. However, TPU injection molding has its unique characteristics, and mastering the following five key points is essential for producing high-quality TPU products.
Precise Temperature Control
Temperature is crucial: TPU injection molding is highly sensitive to temperature. Precise temperature control is essential from the hopper to the mold.
Temperature impact: Temperature directly affects the melting state, fluidity, and final product performance of TPU. Overheating or underheating can lead to product defects.
Injection Speed and Holding Pressure
Speed impact: Excessive injection speed can cause internal stress in the material, affecting product stability.
Holding time: Insufficient holding time can lead to shrinkage and deformation.
Equipment Selection
Matching principle: Selecting the appropriate injection molding machine and mold is the foundation for successful TPU injection molding. Different models and specifications of TPU require matching equipment.
Equipment performance: The injection molding machine should have high plasticizing capacity and precise temperature control.
Material Drying
Moisture impact: Moisture can significantly affect the processing performance of TPU, leading to defects such as bubbles and yellowing.
Drying treatment: TPU raw materials must be thoroughly dried before injection to remove moisture. Drying equipment: Select suitable drying equipment and strictly control the drying temperature and time.
Process Refinement
Full process control: From raw material blending to product molding, precise control is required at every stage.
Process optimization: Continuously optimize process parameters, improve operating procedures, and enhance automation levels.
