Characteristics of direct heating pressure forming

Most heating methods involve either radiative heating of sheets stretched in space using infrared or heating air with hot air, but direct heating vacuum forming is a method that heats and forms sheets by closely adhering them to a properly temperature-controlled heating plate.
【Features】
1. By managing the surface temperature of the heating plate, uneven heating does not occur, resulting in uniform and stable molded products.
2. The heating time is shorter due to contact heat conduction between solids, being a fraction of the time required for the radiation heating method that involves air.
3. There is little heat dissipation, making it efficient.
4. A large number of exhaust holes are required to expel the air between the heating plate and the sheet, leading to high production costs for the heating plate.
5. Auxiliary means such as plug-free blow cannot be used, resulting in only shallower molded products compared to straight vacuum forming.
6. In the case of multiple parts, the influence of adjacent molds can affect the outcome.
7. As the molded product cools, it may shrink in the direction that tightens against the mold, making demolding difficult.
8. Sufficient draft angles for demolding must be provided, or if there are slight undercuts, a knockout device will be necessary.
9. In deep draw vacuum forming, when pushed up and stretched, the sidewall portion is elongated in one direction, creating directionality in the molded product and reducing lateral strength.

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