VACUUM FORMING METHOD
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United States of America Patent
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Jan 26, 2012
filing date -
Jan 28, 2011
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Abstract
Mainly, local wall thinning is prevented. The invention relates to a vacuum forming method for fabricating a resin-molded article. The vacuum forming method includes pressing a thermoplastic resin sheet 201 softened by heating into a vacuum forming mold 202 using a core mold 203 to stretch and deform thermoplastic resin sheet 201 at the same time, and bringing the thermoplastic resin sheet 201 into intimate contact with the vacuum forming mold 202 by vacuum suction to shape the thermoplastic resin sheet 201. In the process of closing the vacuum forming mold 202 and the core mold 203, at least part of the thermoplastic resin sheet 201 is preshaped using air pressure in such a way that the at least part of the thermoplastic resin sheet 201 is locally stretched and deformed at the same time and thus brought into intimate contact with the core mold 203. Then, the thermoplastic resin sheet 201 is final-shaped by closing the vacuum forming mold 202 and the core mold 203 and performing vacuum suction through the vacuum forming mold 202.
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