SU1708647A1 - Test-object for color printing - Google Patents

Abstract

The invention relates to prints, namely, test objects for controlling a multi-color printing process, and can be used to control the uniformity of a layer of applied ink. The test object is made up of sequentially printed ink fields in the following sequence: purpurna, purpurna + yellow, purpurna + yellow + blue, cyan + yellow, and blue. The floor is made in the form of raster structures with a relative area of their raster elements of 50-70%, the same for all inks, and are arranged in parallel forming the printing cylinder. 4 il.

Description

The invention relates to printing, and more specifically to test objects for controlling a multi-color printing process.

The quality of the final print-print product largely depends on the setting of the printing process — on the supply and transfer of inks.

For prompt and adequate control of the printing process, it is necessary to use test objects, the elements of which most fully reflect the course of the printing process.

A block of test object is known for controlling the printing process, designed to control the supply and transfer of inks during the printing process. The block is made of elements in the form of a number of adjacent fields of monochromatic and binary dies, where dies with binary overlay of colors border the floor of dies of monochromatic colors.

The disadvantage of the elements of this test object for controlling the supply and transfer of ink in the printing process is that they (the elements) are not raster fields, but dies. Plash; This is not a characteristic printing element for offset printing and does not contain whitespace elements that create gradation levels, create halftones. The change in ink supply at the plate affects only the transition of ink in the printing process, and when the floor is raster it affects the change in the pitch and hydrophilic-hydrophilic balance of water paint (for offset printing), which significantly reduces the reliability of the yi sensitivity of the test object, as well as speed control.

In addition, the block is composed of discrete elements spaced apart from each other at a certain distance, and a visual comparison of two fields of the same type is impossible, which makes it very difficult to control the uniformity of the supply and transfer of paints, and also significantly increases the time for control, while use of densitometers, which ultimately reduces the efficiency of use of the test object.

The purpose of the invention is to simplify the monitoring of the uniformity of the thickness of the applied paint layer.

The goal is achieved by the fact that the test object (TO) is made in the form of sequentially printed ink fields in the following sequence: purpurna (L), P + yellow (W). P + F + blue (P. G + F and G. Paul is made in the form of raster structures (PC) with a relative area of their raster elements (OM) 50-70%, the same for all inks and arranged parallel to the generator of the printing cylinder,

Position, the effect is achieved due to the fact that the set of essential features (SSP) allows the formation of continuous raster fields, and these fields partially overlap. The size of the re 5070% is explained by the fact that, as shown by the conducted experiments, in this interval one observes a very low to zero and a very high more than 100% overlap of the re when applying paints.

If the OM is reduced to less than 50%, the OM overlap is less than 50% or the OM is placed next to the printed paper without overlapping, which greatly simplifies the printing process.

With an increase in the re more than 70%, the overlapping of inks is more than 100% (three inks lie one on top of the other) and due to the contamination of printing inks, color fluctuations are visually less noticeable.

This interval (50-70%) includes the interval of the maximum sensitivity of the eye to changes in tonality and is itself an interval where the tonality in the printing process itself is unstable, and the method of forming the color is autotypical.

The positive effect of the proposed technical solution is also achieved by the fact that in the process of adjusting the printing process and during the printing process itself, the printer can visually monitor the change in the color tone in the overlapping areas of the inks over the entire length (n) or width of the printed sheet due to the continuity of these elements. The alignment of the color tone over the entire length of the overlapping zones indicates the uniformity of supply and transition of colors in the printing process, and the color tone of the triple overlap area with the same number of three color inks has a dark brown color and determines the quantitative balance of colors. In the prototype, visual comparisons are not possible. as long as the repeated elements are spaced more than 15-25 cm apart, therefore, densitometric measurements are necessary.

In the proposed technical solution, colored inks are taken in the same amount and the color tone at normal supply and Transition of colors will always be dark brown. If the supply or transition of one color, for example blue, is exceeded, then the color of the floor is blue, green or goes into a series.

The proposed technical solution

serves for the Control and evaluation of the uniformity of supply and transfer of paints along the generatrix or along the perimeter of the printing cylinder. The control criterion is the same

colors across the field, not the color itself, but you can also control the number of colors applied to the color tone of the floor.

The new properties of the proposed test facility consist in an increased sensitivity to changes in the irregularity of the supply and transfer of color inks during the printing process, independent of additional factors, and the speed and objectivity of monitoring and evaluation, as they are carried out

visually and do not require measuring instruments and carrying out densitometric measurements, which simplifies monitoring.

FIG. 1 shows the scheme of the test object; in fig. 2-4 - raster images

items.

EXAMPLE 1: The test object includes similar rectangular fields 1-3 (the field is conditionally extended): field 1 for magenta (P) paint; field 2 - for yellow (L);

Field 3 - dl blue (D) - Area 4; the overlap of Ж + П inks is red, the area 5 - Ж + Г inks is green, and the area b - Г + П + Ж is dark brown. All floors 1-3 are made in the form of identical raster structures. For example, for field 3 in FIG. 2 shows a raster structure with a relative area of raster elements of 50%. Region 4 (FIG. 1) is shown in FIG. 3 when re 50% with the imposition of re.

PRI mme R 2. That same “the same as in example 1, but. the relative area of the raster elements is 60%.

Measures 3. Same as in Example 1, but the relative area of the raster elements is 70% (Fig. 4).

The test object works as follows.

In the process of printing on the periphery of the printed sheet (in length, as well as possible in width), a floor of 1, 2 and 3 test objects are printed with three color inks. According to the obtained image of the test object visually

control the uniformity of supply and transfer of colors. The ejection of the test object, located along the length of the sheet, controls the uniformity of ink supply and transfer along the generator cylinder, and the width of the sheet - along the perimeter of the printing cylinder.

Claims (1)

5 Formula of the invention Test object + for the color printing process, containing monochromatic and multicolor fields of color printing inks, characterized in that, in order to simplify the control of uniformity of the thickness of the applied layer of ink, the test object contains printed ink fields in the following sequence: magenta , magenta + yellow, magenta + yellow + cyan, cyan + yellow and cyan, and the fields are made in the form of raster ctdvktvd with a relative area of raster elements of 50-70%, the same for all colors. figure 1 well F Figure 2 Fig.Z Fig.b