This invention involves with a kind of offset PS plate with compound support and its manufacturing process. PS plate has
sensitization imaging layer set up on the front side of its
aluminum substrate, and has a membrane of
polymer materials covered on the back side of the substrate, which form the structure of compound support. The manufacturing process firstly deoils and cleans the
aluminum substrate, and covers a membrane of
polymer materials on the back side of plate substrate; then conducts
electrochemical corrosion and roughening, generates oxidation layer through the oxidization of
anode, carries out sealing or hydrophilic treatment for the oxidation layer, and coats
sensitization liquid onto this oxidation layer; finally, dries and cuts the plates into finished products. This invention may use relatively thin aluminum materials to keep relatively high quality, greatly reduce the consumption of aluminum, and decrease the cost. The mentioned membrane is featured by strong
toughness; after compounding, the substrate enjoys great tensile strength, so the plate is not easy to break during printing; and also, the substrate has lower density, which could lighten the weight of finished plates.
Polymer membranes have extremely
smooth surface, so multiple sheets of PS plates overlapped won't scratch the
sensitization layer, and will require no
interleaving paper. What's more, the manufacturing process of PS plate with compound support is basically accordant with the original one, and the compounding of membrane is simple and quick.