Piece of thin cardboard (not the corrugated type), about 30x30cm

一块薄纸板（不要波浪形的），约30*30cm

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Plate type or corrugated type should be based on the actual needs of the heat exchange places.

板片型式或波纹式应根据换热场合的实际需要而定。

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These rolls are corrugated cylinders, usually of the spiral type.

粉碎辊是波纹式滚筒，还常是螺旋割纹式。

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This Ohio company, founded as a wooden barrel maker, makes steel drums, corrugated boxes, water bottles, rain barrels and basically every type of packaging you could think of.

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