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CTP system check + RIP LUT’S

Technical approvals and expert opinions for CtP imaging systems

CTP system check + RIP LUT

This must be checked after the purchase of a CtP system. The aim is to achieve a trouble-free, economical and high-quality production process. High process stability in imaging and plate development is important for the quality assurance of a CtP system. This is the only way to reliably reproduce the print result.

You get production reliability right from the start and thus higher productivity. Quality control during plate production is intended to ensure that only printing plates with perfect properties reach the press.

In addition, progressive standardization and the constant shortening of production times presuppose unconditional system reliability.

When exposing conventional printing plates, it is important to note that not all makes of printing plate can achieve the same results when exposed in CtP systems. Despite the same categorisation (“conventional printing plate”), there are only a few printing plate makes which have been specially adapted for exposure in CtP systems or developed for this application.

It should therefore be pointed out that there are differences between the individual makes of plates

As with the printing plate brand, the brand of the development chemicals can be regarded as an influencing factor. It is always advisable to use the system developer provided by the plate manufacturer or the approved development chemicals from third-party suppliers.

In the case of unsuitable combinations of printing plate and development chemicals, the chemical system may become unexpectedly unstable and result in faulty plate development despite an initially flawless output result.

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The CtP acceptance test contains the following test criteria:

– Testing of the climatic conditions and storage of the material
– Checking the connected workflow
– Adjustment of the plate exposure unit with regard to intensity and focusing of the laser beam on the printing plate used
– Checking the transmission quality using digital control means
– Consistency of exposure over format (homogeneity)
– Capturing the plate throughput
– Testing the mechanical properties of the imagesetter, e.g: Register accuracy including plate change.