| 摘要 |
PURPOSE:To obtain the titled product contrived so that the wall thickness is prevented from becoming thinner at the undercut area provided with patterns like crimps, stetches, etc. on the surface by a method wherein thermoplastic resin sheet is vacuum-formed by a male mold, then, said formed piece is released from the mold, heated and further vacuum-formed by a female mold. CONSTITUTION:For example, in the 1st process the thermoplastic resin sheet 3 is heated and softened between the heaters 1, 1 and vacuum-formed by the vacuum- forming male mold 4 to the specified shape to obtain the formed piece M. In the 2nd process, said formed piece M is removed from the male mold and heated between the heaters 1, 1 at the softening point max. of the resin sheet. Further, in the 3rd process, the above heated formed piece is set into the vacuum-forming female mold 5 on which a negative with a specified crimp or stetch patters 6 provided on the final formed item surface is engraved to obtain the desired product by vacuum forming. |
