| 摘要 |
A one-piece, lightweight, molded plastic hat that comprises, in combination, a thin, molded plastic sheet forming a hat wall dome having an inner side, the sheet at the dome everywhere having thickness less than +E,fra 3/16+EE inch; the sheet at the dome forming a corrugation having a local portion defining a U-shaped cross section; and a local plastic reinforcement sub-sheet formed to have U-shaped cross section matching that of the dome local portion, the sub-sheet fitting and adhesively bonded to the dome sheet local portion at the inner side of the hat dome.
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