A. PS version (plate) classification, structure and performance
1. Classification of PS plates:
——Pattern version of positive type PS: PS version of printing with positive color separation sheet,
The photosensitive film produces a photodecomposition reaction under ultraviolet irradiation.
——Graphic PS version: PS version of negatives using color chart
Its photosensitive film produces photopolymerization under ultraviolet irradiation.
Divided into plate base, oxide layer, photosensitive layer
2. PS plate structure:
- Edition base: aluminum metal base. There are usually two thicknesses of 0.25mm and 0.15mm.
——Oxide layer: ie hydrophilic layer, through anodizing and sealing process
A porous, hard oxide layer forms on the side of the plate. Has strong wear resistance, corrosion resistance, water absorption.
- Photosensitive layer: the oleophilic layer, by the photosensitizer (nitrogen compound),
Film-forming resin, dye, solvent and other components.
3. PS version of the main performance indicators:
- Surface roughness: 0.40≤Ra≤0.90(um)
- Plate base oxide quality: 1.50 ~ 3.50 (g/m2)
- Base substrate photosensitive layer quality: 1.60~2.50 (g/m2)
- Resolution: ≤ 10.0 (um)
——Reproducing range of outlets: 2%~98% Complete outlets - Version base color density: ≤ 0.03
- Sensitivity: ≤300 (mj/cm2)
——Retaining film rate: ≥90%
- Thickness of printing plate: 0.15~0.40mm (thickness deviation? 0.01mm)
- Printing plate size: in line with GB/T
——Resistance to Indian Force: Undecided Note: The main factors that affect the printing plate's resistance to printing force 1PS version of photosensitive film adhesion 2 Divided color film on-site density 3 Printing pressure 4 paper with impurities (grit) quantity 5 Fountain solution Ph value