Positive Thermal CTP Plate for Commercial Printing

In the modern commercial printing industry, efficiency and precision are
essential to business competitiveness. With the widespread adoption of
Computer-to-Plate technology, positive thermal CTP plates have become a key
consumable for high-quality printing applications such as catalogs, packaging,
newspapers, and magazines, thanks to their excellent dot reproduction and
stable press durability.
As a leading supplier of printing consumables, we are committed to providing
high-performance thermal plates with stable physical properties and outstanding
chemical resistance.

What Is a Positive Thermal CTP Plate?
A positive thermal CTP plate is a printing plate that is directly imaged by a
thermal laser, usually an 830 nm infrared laser. During exposure, the coating
in the laser-exposed area undergoes a chemical change and is removed by the
developer, forming hydrophilic and oleophilic image/non-image areas for
printing image transfer.

Product Structure and Working Principle
1. Structure
A positive thermal CTP plate usually consists of the following layers:
Aluminum Substrate: High-purity electrolytic aluminum, providing good
mechanical strength and dimensional stability
Anodized Layer: Enhances press durability and hydrophilicity
Photosensitive Coating / Thermal Layer: Sensitive to infrared laser and enables
image conversion
Protective Layer: Prevents scratches and contamination during transportation
and storage
2. Imaging Principle
When the laser beam of the CTP device irradiates the plate surface:
The photosensitive layer absorbs thermal energy, causing molecular structure
changes
The exposed area dissolves in the developer
The unexposed area remains, forming the printing image
This process eliminates the need for traditional exposure films, greatly
improving efficiency and reducing errors.

Why Choose Positive Thermal CTP Plates?
1. Extremely High Imaging Resolution
Using advanced multi-layer coating technology, the plate supports 1%–99% dot
reproduction. Whether it is delicate portrait skin tones or complex anti-
counterfeiting lines, the plate can reproduce details accurately and meet
printing requirements of 200 LPI or even higher screen rulings.
2. High Plate-Making Stability and Wide Operating Latitude
The imaging process of positive thermal plates is almost unaffected by changes
in ambient temperature and humidity. With a wide development latitude, the
plate has good tolerance to fluctuations in developer concentration,
temperature, and development time. For printing companies with variable
production environments, this means a lower plate waste rate and more stable
production output.
3. Daylight Operation, Convenient and Safe
Unlike traditional photosensitive plates that require strict darkroom
conditions, positive thermal CTP plates are insensitive to indoor yellow safe
light and can be operated under daylight conditions. This greatly simplifies
the environmental requirements of the plate-making workshop, lowers the
operating threshold, and improves work efficiency and safety.
4. High Press Run Length, Suitable for Medium and Long Runs
Commercial printing orders often involve medium and long-run jobs such as
books, catalogs, and promotional leaflets. High-quality positive thermal CTP
plates usually offer a press run length of 100,000–150,000 impressions without
baking. After baking, the run length can be increased to over 500,000
impressions, fully meeting the requirements of large-scale commercial printing
production.
5. Environmentally Friendly and in Line with Sustainable Development
Positive thermal CTP plates use water-soluble developers and contain no toxic
or harmful solvents. Waste liquid treatment is simple. Compared with
traditional PS plates and some photosensitive plates, they require fewer
chemicals and generate waste that is easier to dispose of in an environmentally
friendly way, meeting the green development trend of the printing industry.
6. Broad Machine Compatibility
After strict testing, our positive thermal plates are fully compatible with
mainstream CTP platesetters on the market, including:
Kodak full series
Heidelberg Topsetter / Suprasetter
And other mainstream thermal CTP platesetters

Minimum Order: 2000 square metres

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