| 摘要 |
The present invention relates to a corrugated product ( 10 ), comprising at least one first substantially plane sheet ( 11 ) and at least one second sheet ( 12 ) arranged in wave shape, wherein the first sheet is joined with the second sheet in joining areas ( 15 ), forming a framework shape having the joining areas arranged at tops ( 14 ) of the second sheet, wherein the tops are formed by thinner portions ( 18 ) of the second sheet and wherein the joining areas substantially include the entire thinner portions of the second sheet.
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