Computer Color Matching To Improve Printing And Proofing Efficiency

The computer color matching system consists of two parts: the software system and the hardware system. The software system is software for color matching and color matching. The theory of Kubelka-Munk is used as the theoretical foundation of optics. It can modify the color matching of single fabric and blended fabric, establish and manage the color formula library, control the quality of production, and can intelligently adjust the formula to compensate for the interaction between the dyestuffs and dyestuffs.

The hardware system is a spectrophotometer, and its basic components are light source, separate monochromatic light and photoelectric detector.

In this process, first of all, we should set up the basic database of the calibration coloring of dyes, set the chromatic environment parameters of the formula prediction, (color matching and isochromatic evaluation light source, spectral range and wavelength interval, CIE standard colorimetric system, dyeing process, dye combination mode and dye color difference tolerance), then measure the standard color sample, predict and calculate the dye formula, draw the preliminary formula after the small sample dyeing, and finally make the formula correction to minimize the chromatic aberration.

In general, the formula obtained by the computer color matching system can only be corrected 1~2 times.

Each base cloth should be taken from the dyed fabric in production, some of which will be stored directly into the computer after being directly measured, and the other part will be used for making basic samples.

The fabric with the same material and different structure, the same fabric with the same structure and different fabric, should be considered as different types.

The dye samples for making basic samples should be as many as possible, so that when matching colors, several formulations that meet the requirements can be obtained from various dyestuffs of different hue, and the choice is large, so that satisfactory results can be obtained.

In order to ensure the accuracy of color matching, dye batting tests should be done when dyes with different batch numbers are changed.

Each dye should be dyed into 8 basic samples with different concentrations (for fabric weight).

The range of dyeing concentration and the grade of concentration should be determined according to the actual situation.

In sample making, attention should also be paid to the specimen being made by the same person to ensure consistency.

The dyes for making a set of basic samples can not be divided into 8 times. A certain amount of dyestuff should be dyed at a time to form the dye solution. The dye solution should be diluted according to the concentration of the dye solution to obtain different concentration of dye solution.

The production conditions of the basic samples should be simulated as far as possible.

The pH value of bath, the type and dosage of auxiliaries, time, temperature, bath ratio and post treatment conditions should be the same as that of mass production.

For blended fabrics or yarns, the basic samples of dyeing and staining should also be obtained according to the one bath or two bath method used in bulk sample production.

To do this, we should use it.

One component from the raw material was stripped and two single component fabrics were obtained for dyeing and staining samples.

Before storing basic data, the basic samples must be measured.

The basic samples are generally based on the following principles: choose the large diameter hole as far as possible; the surface uneven or coarser fabric should be measured more, and the average value should be taken; the surface of a set of samples should be consistent with the direction of the grain; if it is a yarn sample, it should be wrapped around the frame in advance, and the density is uniform and the number of layers is the same. It is best to wrap 4 layers. If it is woven into cloth, the result will be more accurate.

The basic yarns of towel products should be measured after the yarn is used.

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When measuring the color of the colorimeter, it is necessary to set up and standardize the parameters of the computer and colorimeter, such as D65 light source, 100 field of view, or SCE, CMC L/C=2/0.5 or 2/l, etc.

Before measuring colors, black and white plates should be used to calibrate colorimeter and computer. The measured objects must be kept smooth and certain tension in the coloring hole; attention should be paid to the organization of the tested objects, the difference between the positive and negative sides, and the influence of twill and fuzzing surface; attention must be paid to the uniform condition of dyeing; if the dyeing is not leveled, it must be redone; the color sample cloth should be rotated at different angles, and the directional color should be measured.