A guide to improving the accuracy of Cigarette Boxes and the clarity of the dots, you deserve it
Jul 30, 2021
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A guide to improving the accuracy of Cigarette Boxes and the clarity of the dots, you deserve it
In the Cigarette Boxes factory, any realization of intelligence and automation must be based on the production quality of Cigarette Boxes. High-efficiency production without quality is not advisable, nor is it the direction for the transformation and upgrading of the Cigarette Boxes factory. Therefore, when using intelligent equipment, the Cigarette Boxes factory must grasp the product quality. This article focuses on how to improve color registration accuracy and dot definition, and improve printing quality through intelligence.
airbag squeegee, which helps to improve printing quality
The traditional sealed squeegee device is to adjust the position of the blade and the anilox roller, adjust the pressure and control the ink transfer by moving the position of the squeegee blade on the knife holder. There are many human factors in this kind of operation, and the adjustment of the knife often cannot achieve the best effect, and the service life is short.
The advantage of the airbag squeegee is that the thickness of the ink layer can be adjusted according to the product requirements. The squeegee is controlled by air pressure, and the ink is uniformly squeezed to ensure consistent color. Compared with the traditional squeegee, the service life can be extended by about 30%.
The comparison of coated paper printing of traditional printing plate and flat screen printing plate is shown in the figure below. When the conventional printing plate is printed on coated paper, the printing surface will appear uneven, and the micro-cell printing plate is relatively uniform.
From the perspective of the printing plate, the surface of the micro-cell printing plate is flat, and the regular dots are raised dots, which are dome dots, which are susceptible to pressure changes that affect the printing quality.
From the point of view of dot printing, conventional printing plates cannot be produced with 1:1 dots, and the printing dots are deformed; flat screen dots are made according to 1:1, and the printing dots are not deformed.
Vacuum adsorption transfer mode, accurate color registration
The traditional paper feeding mode includes two modes: paper feeding roller and belt. The paper feeding wheel transmission mode can adopt 5 groups of leading edge paper feeding wheels, and the extended paper feeding platform is beneficial to the stable paper feeding. When the width of the cardboard is small, it is better than the three groups of paper feeding wheels mode. The advantage of the belt paper feeding mode is that the transfer cardboard has a large frictional force, which is beneficial to the production of curved cardboard. The disadvantage is that the belt is easy to wear and slip, and it needs frequent cleaning and maintenance.
The advantages of vacuum suction transmission are that the cardboard follows the belt, the cardboard transfers smoothly, its printing color is accurate, and there are few human interference factors; while the traditional printing machine's paper wheel transfer mode is due to equipment vibration, gear accuracy, printing unit transfer, etc. Factors, its overprint accuracy and printing accuracy are poor. Vacuum suction transport also has its shortcomings. Once ink leaks, it will affect the transport system and it is difficult to clean.
Vacuum adsorption transmission mode, its maintenance is very important, if it is not refueled for a long time, it will seriously affect the transmission accuracy.
The application of dust removal system helps to ensure the quality of printing
If the dust removal effect is poor during printing production, the chance of rubbing the printing plate will be greatly increased. Therefore, a circular dust-removing brush can be installed in the rear section of the paper feed wheel, and it can rotate synchronously with the speed of the vehicle to remove dust; in the down-print printing machine, a dust-removing brush can be installed on the lower wheel to operate synchronously with the equipment.
Corrugated cardboard paper is very easy to produce dust, and the color block pattern is very easy to produce white defects during the printing process. Nowadays, there has been a two-roller bidirectional dust removal device on the market that can efficiently remove dust from the corrugated cardboard that is fed into the machine. The fine burrs are efficiently removed to ensure the high definition of the printed graphics.
Double anilox roller structure, one machine with multiple functions, which helps to ensure the printing quality
The anilox roller of the conventional printing machine is fixed. It takes a long time to replace the anilox roller, which is particularly troublesome.
The double anilox roller structure is to install two sets of anilox rollers with different screen lines and a matching ink supply system in the same printing unit. One-click switching can easily cope with different paper qualities of coated paper and liner paper, high dots, and different large areas. Printing that requires ink.
The application advantage of printing machine double anilox rollers is that two anilox rollers can be configured in one printing unit, and they can be adjusted and used according to product requirements, which is conducive to ensuring printing quality.
Such as the configuration of a printing machine: 250 meshes for the first color, 350 meshes for the second color, 350 meshes for the third color, and 250 meshes for the fourth color. This configuration is more applicable.
But if there are three colors with large color blocks or all three require high network lines, then the printing machine will be difficult to produce at this time. details as follows:
1. When there are three large color blocks, it is difficult to print 350 mesh color blocks.
2. If the three-color dots exceed 60 lines, the printing of 250 mesh is prone to blockage.
But if double anilox rolls are used and two suitable anilox rolls are configured for switching, this problem can be quickly solved.
Dual anilox roller structure, switching anilox rollers can be completed within 3-5 minutes, and the operation is very simple. This method can give greater play to the performance of the printing equipment, that is, one machine can be used for multiple purposes. It can print high-net-line products as well as make ordinary products.