| 摘要 |
Monoliths made by joining ribbed sheet together have a tendency to collapse when the ribs of adjacent layers do not coincide. When the monolith is made by winding embossed sheet around a mandrel there will always be places where ribs do not coincide and which tend to collapse. This deficiency is minimized by using sheet with ribs having un-equal separation. Such sheet is obtained by embossing with a roll designed for this purpose, and the monoliths of this invention have unique features of channel dimensions. |
