We have a large job running on two different sheetfed presses at the same time. Both presses are running the same paper, ink, and fountain solution. On one press the fit is acceptable; on the other press the image is out of register by several rows of dot
Nov 2, 2020

Paper expansion or distortion is usually caused by excessive impression cylinder pressure and/or excessive fountain solution on the plate(s) transferring to the paper. Ink coverage, high tack, and the smoothness of the surface of the blanket can also contribute to paper distortion. Excessive fountain solution can soften paper making the paper dimensionally unstable. Heavy ink coverage will pull or put more force on the sheet; a blanket with a rougher surface will have better "sheet release" and pull or distort the sheet less. The variation in the fit on one of the presses is most likely being caused by these factors.

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