Discussion on digital quality management of the mo

2022-07-31
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In recent years, China's packaging and decoration printing plants have been developing continuously, and a large number of modern plate making and printing equipment have been introduced from abroad, which has added a certain material foundation for the development of packaging and printing towards modernization. In particular, the application of lithography in packaging and decoration printing is increasing day by day. A large number of exquisite packaging and decoration printing materials have been closely related to people's life and become indispensable necessities. How to improve the quality of lithographic packaging and decoration prints is also very important

I. The importance and significance of digitalization and other applications

it is necessary to improve the quality of packaging and decoration printing. Like the old-fashioned methods that rely solely on the operator's personal technical level and experience, they can no longer adapt to the current booming trend of packaging and decoration printing modernization. It should be replaced by advanced technology Scientific quality management, quality inspection and other modern and scientific management methods. In the modern and scientific management, data, standardization and standardization are essential means to ensure the quality of packaging and decoration printing

most of the lithographic packaging and decoration prints are composed of fine lines (about 175 first) and spot color blocks. In a large number of complex printing processes, control and stabilize the quality of dots and color patches, then. Data and standardized operation is more important. How to understand data, standardization, standardization and the relationship between them

I think: data is the scale used to measure objective things, and it is also the first-hand data for statistics and analysis. In the whole process, all quality related verification must rely on instruments for measurement. And from the accumulated and measured values to analyze and find, select the effective best value, as the basis under certain conditions and process measures, is to achieve the effect of correct restoration of printed products

standard refers to the process specification, which is to fix the process conditions and some parameters in each process with corresponding data through practice, and operate according to certain requirements under certain conditions, so as to obtain ideal results

standardization is the basis of the whole production activities of an enterprise. It is a summary of people's understanding of the objective laws of things. Proceeding from the interests of the overall situation and taking things with repetitive characteristics as the object, the formulation and implementation of various standards in an organized way are inseparable from the standards in the whole activity process, including the formulation of quality objectives, organization and implementation, supervision and inspection. The quality of printing products largely depends on the level of standardization industry

datalization is the first stage. Only after the completion of datalization can we enter the second stage of standardization. That is, the transition from data production to standardized production. Standardization is to complete the standardization, and finally integrate various process specifications, and then transition to the standardization stage

in the process of lithographic packaging printing, data control should be used to achieve digitalization, standardization and standardization. Conditions such as relatively stable advanced equipment and raw materials, testing two boards, testing means and process methods must be available. Based on the previous good and bad production, a large number of measured data are taken as the basis. Strictly control the printing production process, and formulate the best process procedures and management routes on this basis

for example, for some key products (with high customer requirements), we must formulate product quality requirements and process regulations. The process regulations must be controlled from the start of business to the delivery of finished products. At the same time, it is the only way for the social productivity to develop with science to make it quantitative and data-based as much as possible. We must cater to the data: on April 27, we should develop and find the best way to adapt to the national conditions and factory conditions, and truly implement the digitization and standardization, so as to make the production of lithographic packaging and decoration prints onto the standard road

II. Some practices in the implementation of digitalization

1. Control of two main raw materials

ink and paper are the main printing materials, one of the main factors for the quality of packaging and decoration prints, and also a main content of data control

ink and paper shall have good printability. However, due to the instability of its own quality and property, such as the three primary color ink does not conform to the actual efficiency in printing, the instability of paper whiteness, surface smoothness, permeability, elasticity, pH value, etc., will also affect the normal point transmission, and the contrast, gloss, clarity, overprint, etc. of the picture will bring great difficulties to the gray balance, which will greatly affect the reducibility and repeatability of packaging and decoration prints

in order to improve the quality of packaging and decoration printing materials, we must measure and classify the performance and types of ink and paper, and control them in the form of process flow card. In particular, if the same kind of packaging and decoration printed matter adopts different series of humor and paper, its color restoration effect will be different. Therefore, we should carry out spot check and inspection on the color hue, fluidity, dryness, etc. of the ink in advance, and carry out spot check and inspection on the whiteness, smoothness, permeability, moisture content, etc. of the paper in advance. Record the results of a series of tests on ink and paper, so as to provide reliable data for mastering the printability

for example, use a color densitometer to measure Shanghai 05 ink and three color standard series ink respectively through R, G and B color medium filters, and record the high, low Low density value:

color of color filter

05 ~ 24 medium yellow 05 ~ 15 peach red 05 ~ 32 sky blue

b blue purple h1.12m0.71m0.69

g green m0.14h1.37l0.26

r red l0.10l0.20h1.56

color deviation of ink can be calculated:

color deviation = (DM - DL)/DM - DL) * 100%

gray level = (DL/DB) * 100%

efficiency = {1 - (DM + DL)/2DM} * 100%

note: if the test result data deviation is too large, the color line is seriously biased, and it should be adjusted to avoid being adjusted or stopped when the call is made

2. Stable control of printing machine

different printing machines shall be selected for different requirements, sizes, characteristics, etc. of boa decoration printing materials of the branch. However, no matter which printing machine is used, the printing machine operated shall be in good operation. Therefore, it is necessary to establish the data record of the printing press which will make the aircraft lighter and its interior more exciting. Such as the installation level error value of the machine, the gap between the rollers, the diameter error value of various ink rollers and the adjustment between them, etc. In addition, there should be regular inspection, adjustment and maintenance records of several sets

for example, when the domestic 08, 03 and 05 offset printing machines print 250 ~ 400g/m2 paper, the center distance adjustment of the three rollers

data is: the gap between the plate cylinder and the rubber cylinder shell is 3.95mm, and the gap between the rubber cylinder and the impression cylinder shell is 3.45mm

for printing paper below 250G/m2, the central adjustment value of the three rollers is: the gap between the plate cylinder and the rubber cylinder shell is 3.85mm, and the gap between the rubber cylinder and the impression cylinder shell is 3.25mm

check the installation level of the diagonal imprint with a level detector. The longitudinal horizontal error is less than 0.08/1000, much like the horizontal error is less than 0.04/1000

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