Development of Automatic Watermark Drawing with Computer Systems

We previously reported that we had drawn directly watermark on cylinder paper machines. But the following problems were arisen.· It is difficult to remove the drawing materials that were seeped into the inside of cylinder paper machines.· The watermark was removed by organic solvent.· There is big risk if we draw watermark on cylinder paper machine.Therefore, we investigated watermark that the method of drawing on transfer paper.The following results were arisen.· The new system is more simple than that of last year.· is possible to control the line of watermark by the velocity of drawing and the shape of the pen.· The watermark of transfer paper is transcribed to the cylinder paper machine by the flatiron.· New removal liquid of watermark was invented.· The removal liquid is aqueous solution and doesn't harm for our health.We were able to use the cylinder cover of the watermark repeatedly.