Adjusting Core Parameters
Temperature: For standard PVC sheets, set the temperature between 180°C and 220°C; lower the temperature and shorten heating time for PVC foam boards (e.g., Celuka/Sherwood boards); slightly increase the temperature for wood or plywood substrates. Temperature control deviation should be kept within ±5°C.
Vacuum/Pressure: Set the vacuum level to between -0.06 MPa and -0.09 MPa (increase the vacuum level for thick-sheet forming). For positive-pressure machines, adjust the air pressure to 0.3–0.6 MPa to ensure the sheet conforms perfectly to the mold.
Timing: Adjust heating time based on sheet thickness (e.g., approximately 20 seconds for 0.5mm thin sheets; extend the time for thicker sheets). Ensure the cooling time is sufficient for the product to set completely, preventing deformation during demolding.
Adjustments for Specific Applications
For food packaging, use high-speed blister machines and prioritize stable temperature and pressure to ensure consistency in mass production. For medical device applications using positive-pressure machines, focus on adjusting positive pressure and dwell time to ensure precise detail formation.
After making adjustments, conduct small-batch test runs and record the condition of the finished products under various settings. Gradually optimize the parameters to create a configuration tailored to your specific product, rather than simply applying generic, fixed settings.
Verification and Optimization After Adjustment
After each parameter adjustment, perform spot checks on the finished products to assess forming fullness and thickness uniformity. If issues such as incomplete forming, flow lines (water marks), or deformation occur, make targeted adjustments to the temperature, vacuum level, or heating time to iteratively establish stable production parameters.