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Thermoforming Methods
Thermoforming involves clamping a sheet into a frame, heating it to a formable state, then applying vacuum, pressure, or both to form the sheet to the shape of a mold. Part design generally determines the thermoforming method and the type of mold used. Depth of draw, level of detail in surface and design features, and the need for ribbing, fillets and undercuts may be carefully considered.
The following information summarizes the most common forming methods and their impact on part design and appearance:
A vacuum created between the heated sheet and the mold draws the sheet over a mold (male mold) or into a mold cavity (female mold). This technique allows very deep draws with uniform wall thickness. Molds can be created from aluminum, wood, or epoxy, depending on the finished part design requirements.
Advantages
This method applies air at high pressure to the sheet while it is being vacuum formed. Female molds are most commonly used. A pressure level approximately five times greater than the applied vacuum forces the sheet against the mold surface. The result is greater detail in textures, patterns, corners and other design features of finshed parts, approaching that of injection molding at far lower tooling costs.
Advantages
Note: pressure forming requires a two platen machine with high claiming force to keep the platens closed while applying air pressure.
If necessary, a qualified and experienced expert in the distinct properties and performance of SIMONA Boltaron sheet would be happy to visit your facility to train, diagnose, and guide the production of formed parts with the highest quality, best appearance, and longest service life.