The Principle of Density Meter and Its Application in Printing Quality Control Method (1)

Densitometers are one of the most important quality control tools in prepress and print production processes. The accuracy, consistency, and quality control of color reproduction in most processes rely on densitometer measurements. Practice has proved that the effective use of densitometers is a powerful tool for the implementation of standardization, standardization, and data quality management of printing and copying projects. Its main advantages are:

(1) Color is greatly affected by people's subjective perception. Everyone has a different perception of color. Densitometry provides an objective analysis that overcomes individual differences and thus unifies people's judgments about the depth of ink.

(2) Light source and environment have a great influence on visual color measurement. In the indoor and outdoor look colors are different, in the printing shop and office to see the color is not the same, but the use of the density meter, is not affected by the environment.

(3) Guaranteed proofing and printing quality. Densitometer measurement is very important in proofing and printing. In the production process, the density of the color density is affected by many factors and has a density standard. Through measurement, the depth change of density can be effectively controlled, thereby ensuring consistency and stability of the depth of ink. Sex.

(4) Proofing and printing to establish quality standards. The use of density meter for data management can provide printing operators in different regions and different manufacturers to monitor the production process and achieve the same effect of darkness and lightness.

(5) Color file. The realization of data has become the premise of the printing quality management. The developed standard color data can be recorded and saved for use in the next batch of printing. This avoids the proofs being faded after a certain period of time. Causes inconsistent print colors in each batch.

The type and measurement principle of a densitometer

1. Types of Density Meters Densitometers are classified into transmission and reflection. The transmission densitometer (Figure 9-4) is mainly used to measure the density of the transmitted originals, the density of the output film and the percentage of dots, and is used for the linearization of the imagesetter. The reflection densitometer (Figure 9-5) is mainly used to measure the reflectance of the original density and proofing, print the proof of the various colors of the field density and dot area, dot gain, overprint, print contrast, color deviation and measurement of the three major inks characteristic.

(Figure 9-4 Transmission Density Meter)

(Figure 9-5 Reflectance Density Meter)
D(M)-Density Meter T-Transmission TD-Transmission Density Meter R-Reflectance RD-Reflection Densitometer O-Net Area Tester TR-Transmission and Reflection Dual-Use OT-Net Area Density Meter