dandy roll造句怎么写

watermark: A design pressed into the wet paper during papermaking by the dandy roll to indicate quality and provide a means to guard against counterfeit in case of security printing. The watermark is visible when a sheet of paper is help up to the light.

Laid paper: Paper with watermark lines about 1mm apart crossed at 90 degrees by lines 25mm apart formed by a dandy roll on the paper making machine.

dandy roll for paper-making machines

Wove paper: paper produced Using a plain, woven dandy roll and there fore without laid lines, as distinct from laid paper.