0010010 nbsp; 0010010 nbsp; Thermoforming is essentially a low-pressure process in which the forming force is generated either by vacuum, positive air pressure, or a combination of both. However, in the special case of matched mold thermoforming, the force is supplied by a power press and is usually higher. The usual methods are identified as follows:
1. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Pneumatic differentials in air pressure are created y pulling a vacuum between the heated plastic and the mold.
2. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Pneumatic pressure created by compressed air is used to force the hot plastic against a mold surface.
3. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Mechanical means are used, such as a plug, matched (male and female) mold cavities, and so on.
4. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; A combination of vacuum and/or pressure (pneumatic) and mechanical means is used.
The process involves pressure with heat and can be summarized as:
1. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Heat the plastic in a separate oven, the transfer the heated sheet to a forming press.
2. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Use automatic equipment to combine heating and forming in a single unit, or use a continuous operation feeding the plastic from a role or directly from an extruder line where the sheet retains some of its heat.
3. 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Evaluate the use of a mold where some heat is applied to mold; this approach can produce parts with no or relatively very little frozen internal stress after cooling the formed product.
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