SU520273A1 - Device to control paper and ink properties during printing - Google Patents

Description

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The invention is intended to automatically control the properties of paper and ink during the printing process and can be used in the printing, paper and chemical (colorful) industries.

A printing press for printing is known, which contains a printing cylinder, a color system and a drive.

However, such a device does not provide the ability to control paper properties.

and inks during their interaction during printing.

The aim of the invention is to improve the quality control of the characteristics of the properties of paper and ink,

This is achieved by the fact that the proposed device is equipped with a wipe-out marking system made in the form of an infinite elastic belt located along the printing cylinder made of transparent material, with one photosensor with an illuminator installed inside the printing inliner; . 1 shows a diagram of a device for controlling paper and ink properties; on

FIG. 2 is a print circuit pilot diagram; in fig. 3 - printed impressions received on the device.

The device contains a printing cylinder 1, made transparent, through the axis of which a light guide 2 is inserted (Fig. 2), which illuminates the cavity of cylinder i and the back side of the test paper 4 using a source of visible light 3. Inside the cylinder 1 a photosensor 5 is placed, reflecting the return one Corner paper 4 light.

; The colorful system of the device consists of: elastic mold rollers 6, 7, which were in contact with colorful roll i cylinders 8. and 9 and elastic roll rollers 1О and 11. In contact with the mold rollers 6 and 7, transparent rollers 12, 13 with electronic photosensors 14, 15 and illuminators 16, 17, which serve for the continuous control of the thickness of the paint layer on the fi rm rollers, 7 1 and its changes (which characterizes the paint consumption). Forms yalnki 6, 7 are located parallel to one another along the circumference of the printed clip 1 with mixed along its axis, which allows you to get a flat screen. Mfpto two parallel prints or two full-color three-color prints (see fig.Za and b). Elastic rolls 10 and iJL are bored with elastic elements 18, 19 with ECO-glued on them tendodes 20 2A .. W ;;: ..:.; H.:. A print cylinder 1 and roll cylinders 8, 9 are driven by a 22 ag drive. 2) The device also contains an optical device consisting of an illuminator 23 directing a parallel beam of light onto the paper under test or printing (at an angle of 45) parallel to the two photocells 24 and 25 that receive light reflected from the illuminated objects. Photocell 2 I - matches shine,. reflected diffueno, and the photocell 2 5 is a mirror. The optical device serves to characterize the optical density or contrast and gloss of the print, as well as the kinetics of their change during the printing process and after receiving the print. The optical device can be moved along rod 26 and also makes it possible to determine the intensity of ink marking on clean paper 27, stretched between the pressure roller 28 and the endless belt 28 and the printing cylinder 1. In addition, the device contains a control unit that turns on the device 30 sensors of the thickness of the paint layer (photosensors 14 and 15), forces dragging the roll rollers 1O, 11 (tenode sensors 20 and 21), the optical density of the back side of the print (photo sensor 5), the optical density of the print (photo cell 24) and gloss itsevoy its side (photocell 25); recording device 31 measuring the kinetics of changes in the thickness of the paint layer in Time according to the signals received from the photosensors 14 and 15, the curves of the optical density and gloss of the impression over time, as well as the intensity of the marking trailer from the signal obtained from the photocell 2 4 the paint penetration characteristic In the paper on the signals of the photo sensor 5; the computing device 32, which determines the work of the rupture of the layer of paint (liPkost) according to the signals of strain gauges 2O and 21, finite differences; (or the ratios) of the osseous density filings and the thickness of the paint layer for a given time interval, the difference in print densities and mark marks for a given time. The device for controlling the properties of paper and paint in the printing process works as follows: A predetermined thickness of the paint layer is fed to askcat cylinders 8 and 9. When the drive system is turned on from the drive 22, the paint is distributed uniformly throughout the entire paint system. When ink is rolled, the platen rollers 6 7 are not in contact with the printing cylinder. In this case, the rollers in contact are 6,7,8,9,10,11,13,14. In the process of paint rolling, the roll qi-, indra 8 and 9 carry along elastic roll / s 10 and 11, while growing vay-y. elastic elements 18, 19 with resistance sensors OO, 21 stuck on them, the signals from which are proportional to the forces carried by rollers 1O, 11 in the direction of rotation of the roll cylinders 8 and 9, i, and exhibit stickiness or viscosity of the paint. At the same time with the rotation of the forming rollers, the transparent rollers 12, 13 begin to rotate, and in the photosensors 14, iBi the current changes depending on the optical density proportional to the thickness of the paint layer on the forming rollers 6, 7 and its changes during the impression process. This change in thickness characterizes the ink consumption perceived by the paper. Next, the forming rolls 6 and 7 come into contact with the printing cylinder 1, which makes one complete revolution in one test cycle, and the forming rolls 6 and 7 make three turns. This results in three print-strips of decreasing layer thickness: paint. The change in the thickness of the paint layer causes a change in the optical density measured by the photosensors 14,15. At the same time, two prints are received in parallel (FIG. 3A), each with a decreasing layer of paint, one of which is with the reference and the other with the test paint on the same paper, or on the reference and test paper with the same paint ), During one revolution of the printing cylinder 1, the current in two electronic photocells 24 and 25 changes as a result of i passing first blank paper before the optical device, ff then successively three print strips with a decreasing ink layer. In this case, the change in the optical density of each printed and gloss is determined as the ink is absorbed into the paper. In case of a con-: contact of an imprint fixed on the printing cylinder 1 with clean paper 27, it is located; Spreading on the perekisyvayuschim (mark-up) device 29, it remains a trace of red; ki, the optical density of which is measured by the photocell 24 of the optical device; when it is lowered along the rod 26 in the lower position. The magnitude of the potential; in a given range is inversely proportional to the degree of color fixation on the imprint and the time elapsed from time | his receipt.

In this way, an automatic control of the interaction kinetics (paper and ink during the printing process is performed with continuous measurement of the process parameters).

 Fo rumula and 3 o and u j Device for controlling the properties of paper and ink during the printing process, consisting of g

printed l plate shshivdrov, inking system with control transparent shafts of cameras, strain gauges and photo sensors, i illuminators and computing devices, and with the aim of increasing / quality control of the characteristics of the properties of .. magi and paints, it has a perekisyvayu otmarivakttsuyu system, vypolnennuyu viae endless elastic strap, disassembled under the printing cylinder, made of transparent material, straight;

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