Ronsein | High Quality CTP & PS Offset Printing Plates
Negative PS Plate
Negative-working PS plate developed with weak-alkali chemistry for fast exposure and minimal retouching.
Overview
A negative-working PS plate processed with weak-alkali chemistry for fast exposure and minimal retouching. A dependable, economical choice for high-volume book, newspaper and forms printing.
Request a quote for this plateKey features
Negative-working simplicity
A negative-working plate developed in weak alkali gives fast exposure, sharp dots and minimal retouching for high-volume production.
High photospeed
An optimized photosensitive layer shortens exposure time and raises throughput on existing plate-setters.
Sharp dot fidelity
Fine grains hold small highlight and shadow dots, keeping tone reproduction stable across the run.
Balanced hydrophilic layer
The hydrophilic surface reaches ink-water balance quickly, reducing dampening and paper waste.
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-CNP |
|---|---|
| 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 | 80 – 150 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 negative PS developer |
|---|---|
| Protection gum | Any PS plate protection gum |
| Developing temperature | 21 – 25 °C |
| Developing time | 20 – 30 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 negative-working PS plate?
A negative PS plate hardens where light hits it; unexposed areas remain and are washed off in processing. It offers strong contrast and is well suited to long-run and high-solidity jobs.
Are PS-N plates good for long print runs?
Yes. Negative-working PS plates generally tolerate longer runs and harsher press conditions than positive plates, making them popular for packaging and publication printing.
How should PS-N plates be processed?
Process with a standard negative PS developer at the recommended dilution and temperature (around 20–25°C). Keep developer fresh to avoid scumming on solids.
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