Patent attributes
The present invention provides a planographic printing plate manufacturing apparatus comprising: a cutting process section which cuts a web in a thickness direction of the web by pinching the web with at least a pair of an upper knife and a lower knife, wherein the lower knife includes a flat part supporting a center of the web, a decline part gradually declined an upper end toward outside from the flat part and a cutting edge part having an upper end gradually raised toward outside from the decline part to be a cutting edge, an angle of the lower knife at a boundary point between the decline part and the flat part is 135° or more, a boundary point between the decline part and the cutting edge part is provided so as to be greater or equal to a droop width of a lower surface of a cut product.
