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Comparison between air pressure forming and vacuum forming
- Sep 13, 2018 -

Whether vacuum forming or air pressure forming, the plastic sheet (sheet) is placed between the heater and the mold, sandwiched on the frame, and the sheet (sheet) is sealed with the mold cavity and subjected to thermal softening, using vacuum or A method in which compressed air is used to form a pressure difference on both sides of a sheet (sheet), which is also referred to as simple molding.

The difference between the two is that when the plastic sheet (sheet) is softened and pressed into the desired shape, if the air present in the gap between the mold and the material is removed (vacuum), the material is pressed against the mold by atmospheric pressure to form a vacuum forming. If it is compressed air above atmospheric pressure or vacuum forming at the same time, it is formed by air pressure.

Since the vacuum pump can form a vacuum of less than 0.1 MPa (1 atm), the vacuum degree that can be achieved in the industry is only 0.069 to 0.088 MPa, and the actual differential pressure is only 0.01-0.03 MPa. Therefore, the vacuum formed molded plate (sheet) If the material is thick or the shape of the workpiece is complicated, the molding pressure is insufficient, which may result in poor molding, unclear outline, or even no shape at all. If air pressure molding is used, the pressure of the air compressor can easily reach 0.3 to 0.6 MPa. Generally, even if the pressure is 0.35 MPa and the differential pressure is about 0.25 MPa, it is possible to form a thick plate (sheet) and a complicated shape. Moreover, the air pressure forming speed is fast, about three times that of vacuum forming.

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