Ronsein | High Quality CTP & PS Offset Printing Plates
Positive PS Plate
Conventional pre-sensitized plate with a unique air-evacuation layer for fast vacuum and clean dot reproduction.
Overview
A conventional pre-sensitized plate with a unique air-evacuation layer that delivers fast vacuum and clean, high-fidelity dot reproduction. Ideal for sheet-fed and web offset where proven chemistry and low cost matter.
Request a quote for this plateKey features
Unique air-evacuation layer
Tiny air-evacuation grains on the plate surface greatly shorten vacuum time during exposure and prevent image halation, giving clean, high-fidelity dot reproduction.
High-sensitivity photosensitive coating
Ronsein's photosensitive coating blends first-class photographic emulsion and resin for outstanding alkali resistance, superior stability, high sensitivity and flexible processing — ensuring unmatched resolving power.
Excellent hydrophilic layer
Strong water reception speeds up ink-water balance and reduces water uptake during printing, preventing scum on non-image areas and avoiding paper distortion.
Outstanding multi-grain layer
The multi-grain layer polishes the hydrophilic substances of non-image areas, improving ink-water adjustment and developing of fine dots, and strengthens dot adhesion to extend run length.
Durable anodic-oxidized layer
The durable oxidized surface formed by anodizing the aluminum base resists corrosion and retouching medium, markedly extending plate run length.
Plate structure
Layer technology
Specifications
| Brand | Ronsein-CPP |
|---|---|
| Label | Ronsein label / no label / customer label |
| Gauge | 0.15 – 0.40 mm |
| Coating | Green face or blue face |
| Spectral sensitivity | 350 – 430 nm |
| Exposure energy | 100 – 180 mJ/cm² |
| Resolution | 2% – 98% at 200 lpi |
| Ugra reading | 13-step scale / 3 steps clear |
| Run length | 80,000 – 100,000 |
| Recommended developer | Ronsein developer or any positive PS developer |
|---|---|
| Protection gum | Any PS plate protection gum |
| Developing temperature | 21 – 25 °C |
| Developing time | 25 – 35 s |
| Developer concentration | Powder : liquid = 1:6 (auto) / 1:7 (manual) |
| Baking temperature | 220 – 250 °C |
|---|---|
| Baking time | 5 – 8 min |
| Run length after baking | 300,000 – 500,000 |
| Safe light | Yellow |
|---|---|
| Shelf life | 18 months (10 – 30 °C, 40 – 70% RH, stack < 1.5 m) |
| Package | 0.15 mm: 100 sheets/carton · 0.30 mm: 50 sheets/carton |
Applications
FAQ
What is a positive-working PS plate?
A positive PS (presensitized) plate is image-developed where light hits it: exposed areas are washed away during processing, so the plate reproduces the film positive. It is the traditional workhorse for offset prepress.
What presses and exposures are Ronsein PS-P plates compatible with?
PS-P plates work with standard UV or metal-halide exposure frames/platemakers and all common offset presses. They are a safe drop-in for shops still running analog film or direct-to-plate PS workflows.
What developer should I use with PS-P plates?
Use a standard PS plate developer (positive) at the dilution and temperature recommended in the product bulletin, typically 20–25°C. Ronsein can also supply matched chemistry.
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