Method for measuring strength of image forming surface of planographic printing plate, planographic printing plate and packaging structure for planographic printing plates

摘要

A method for measuring strength of an image forming surface of a planographic printing plate. In this method, an image forming surface of a planographic printing plate is contacted with a non-image forming surface of another planographic printing plate, a weight of predetermined mass is placed thereon, and the planographic printing plates are slid against each other in a direction along the image forming surface. A maximum value of pressure that does not generate damage when applied to the image forming surface of the lower planographic printing plate is used as strength of the image forming surface. By stacking and packaging planographic printing plates having an image forming surface strength of no less than a specified value, damage to the image forming surfaces of the planographic printing plates in a packaged state can be prevented.