Slip sheet for a planographic printing plate, production process thereof and a protected planographic printing plate and laminate thereof
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United States of America Patent
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Jul 13, 2010
Grant Date -
Jan 19, 2006
app pub date -
Feb 27, 2003
filing date -
Feb 27, 2002
priority date (Note) -
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Abstract
The present invention provides a slip sheet that protects a planographic printing plate in which the coefficient of static friction between corresponding surfaces of the slip sheet that contact an image-forming surface of the planographic printing plate is 0.35 or less, the surface strength of the slip sheet is 15 or more, or the Clark stiffness of the slip sheet is 20 to 50. In a production process of the planographic printing plate, the image-forming surface and the slip sheet are adhered by suitably charging, and following their lamination, the charge rapidly dissipates resulting in favorable separation, discharge characteristics and storage characteristics in an automatic plate feeder. In addition, sticking between the slip sheet and the image-forming surface during heat treatment can also be prevented simultaneously. This slip sheet is particularly effective for planographic printing plates of the heat mode type and photon mode type on which images are formed by exposure to laser light.
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