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This method of thermoforming does not use a mold. Instead, an acrylic sheet
is clamped in a frame and either a vacuum or compressed air draws the
material to a desired depth. An electric eye determines when the proper
depth has been reached and cuts off the pressure. Since only air touches the
sheet of material, there is no markoff. Free forming is used to create
windshields for planes, skylights, or anything where optical quality is
necessary.
Advantage is achieving high clarity. |
Molding
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