CN109291620B - Wetting-free stock solution rotary printing system and printing method - Google Patents
Wetting-free stock solution rotary printing system and printing method Download PDFInfo
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- CN109291620B CN109291620B CN201811066122.5A CN201811066122A CN109291620B CN 109291620 B CN109291620 B CN 109291620B CN 201811066122 A CN201811066122 A CN 201811066122A CN 109291620 B CN109291620 B CN 109291620B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/02—Rotary lithographic machines for offset printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/32—Ducts, containers, or like supply devices for liquids
Abstract
The invention relates to a wetting-free stock solution rotary printing system, which comprises the following components: a plate cylinder (1) having a printing plate mounted on a cylindrical outer surface thereof; an ink application system (3) comprising an ink source and a number of ink cylinders for applying ink to the printing plate; a dampening fluid application system (2) comprising a source of dampening fluid and a plurality of dampening fluid rollers for applying dampening fluid to the printing plate; wherein the wetting liquid rollers comprise a water distributing roller (4), a water homogenizing rubber roller (5) and a plate water roller (6); wherein the fountain solution application system (2) further comprises a water distribution screen roller (7), the water distribution screen roller (7) is in contact with the plate water roller (6), and the water distribution screen roller (7) comprises a hard surface layer with Mohs hardness larger than 3, and the hard surface layer is provided with a screen. The invention can use tap water as the wetting liquid, and does not need to add wetting stock solution.
Description
Technical Field
The invention belongs to the technical field of rotary lithographic printing machines.
Background
The rotary printing is to realize the coating of ink on a printing plate by using the principle of water-oil incompatibility and the position with patterns on the printing plate is water repellent and ink hydrophilic; and a thin wetting liquid film is coated on the part of the printing plate without the pattern, and the thin wetting liquid film has the function of ink repelling and hydrophilicity, so that the part covered by the wetting liquid film can not be stained with ink. In order to facilitate the formation of a wetting liquid film, it is necessary to reduce the surface tension of water. Therefore, in the conventional art of the rotary printing, it is necessary to use a wetting stock solution mainly containing alcohols, ethers, surfactants, and the like to realize the printing. In addition, various chemicals such as fountain protectants, wetting agents, pH adjusters, buffers, antimicrobials, surfactants, etc. are added to the fountain solution to maintain the proper functioning of the fountain solution. In the printing industry, various chemicals such as fountain protectants, wetting agents, pH adjusters, buffers, antimicrobials, surfactants, etc., as described above, are often proportioned into a kit for use, which is referred to as a "fountain solution. In the practice of the printing industry, for the sake of ease of handling, alcohols or ethers are also mixed in advance with the various other chemicals mentioned above, and some skilled persons also refer to such mixtures as "fountain solutions".
However, the various chemical agents in the dampening stock solution can cause major disadvantages to the printing industry:
1. many chemical components in the moistening stock solution belong to Volatile Substances (VOCs), and the moistening stock solution has bad influence on the environment no matter the moistening stock solution is discharged in the air or the nature, and particularly in a relatively closed printing workshop, the health of equipment operators can be seriously damaged by ink mist carried by the moistening stock solution when the moistening stock solution is volatilized; various other chemical agents also pollute the environment when the wetting fluid is discharged;
2. chemical agents can significantly increase printing costs;
3. more printing problems are caused. The wetting stock solution can dissolve and dilute the printing ink, and the surface of the printing ink at the junction of the printing ink layer and the water layer is easily eroded by the wetting stock solution, so that the printing problems of poor drying of the printing ink, formation of ink mist, ink piling, easy reverse drawing, light color of the printing ink and the like are caused.
In the field of rotary printing technology, how to design a rotary printing system free of a dampening stock solution (i.e. the dampening solution of the rotary printing system is completely free of the dampening stock solution and is only tap water) is a technical problem which is expected to be solved but is still unsolved by the skilled person.
The invention develops a new method, solves the technical problems at a stroke, develops a wetting-free stock solution rotary printing system for the first time in China and internationally, and is successfully implemented.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
A first aspect of the invention relates to a dampening-free master batch rotary printing system comprising the following components:
a plate cylinder (1) having a printing plate mounted on a cylindrical outer surface thereof;
an ink application system (3) comprising an ink source and a number of ink cylinders for applying ink to the printing plate;
a dampening fluid application system (2) comprising a source of dampening fluid and a plurality of dampening fluid rollers for applying dampening fluid to the printing plate; wherein the wetting liquid rollers comprise a water distributing roller (4), a water homogenizing rubber roller (5) and a plate water roller (6);
the invention has the significant improvement points that:
the fountain solution application system (2) further comprises a water distribution screen roller (7), the water distribution screen roller (7) is in contact with the plate water roller (6), and the water distribution screen roller (7) comprises a hard surface layer with Mohs hardness larger than 3, and the hard surface layer is provided with a screen.
Preferably, the texture is a linear texture or a honeycomb texture.
Preferably, the hard surface layer is a metal layer, a ceramic layer or a glass layer. Of course, any other hard material layer is also included, as long as the material has a mohs hardness greater than 3. Preferably, the mohs hardness is greater than 4, more preferably greater than 5, still more preferably greater than 6, still more preferably greater than 7, and most preferably greater than 8.
Preferably, the thickness of the hard surface layer is 0.02-300mm, the distribution density of the reticulate patterns is 10-1500L/inch, and the depth of the reticulate patterns is 0.01-2 mm.
Wherein, the water-homogenizing screen pattern roller (7) is contacted with a printing plate water roller (6) in the plurality of wetting liquid rollers, preferably the wetting liquid rollers and the printing plate water roller are in pressing contact and rotate oppositely.
Wherein the water homogenizing rubber roller (5) is in opposite rotating contact with the plate water roller (6); the water mixing roller (4) is in opposite rotating contact with the water homogenizing rubber roller (5); the water distributing roller (4) is a metal roller or a ceramic layer covers the outer surface of the metal roller, and the outer surface of the water distributing roller is a smooth surface or has reticulate patterns, preferably has reticulate patterns.
If the outer surface of the water distributing roller (4) is provided with the reticulation, the linear reticulation is preferably distributed with the density of 10-1500L/inch and the reticulation depth of 0.02-2 mm. The texture characteristics on the water distributing roller (4) are not necessarily the same as those on the water homogenizing texture roller (7), and the two characteristics are independently selected.
A second aspect of the invention relates to a method of non-wetting stock solution rotary printing comprising the steps of:
a. mounting a printing plate on the cylindrical outer surface of the plate cylinder;
b. applying a wetting fluid to the printing plate by a wetting fluid application system to form a patterned wetting fluid film, wherein the wetting fluid application system comprises a wetting fluid source and a plurality of wetting fluid rollers, and the plurality of wetting fluid rollers comprise a water distributing roller (4), a water distributing rubber roller (5), a plate water distributing roller (6) and a water distributing screen roller (7); wherein the water-homogenizing screen roller (7) is contacted with the plate water roller (6), and the water-homogenizing screen roller (7) comprises a hard surface layer with Mohs hardness more than 3, and the hard surface layer is provided with screens;
c. applying ink to areas of the printing plate not covered by the patterned dampening liquid film by an ink application system comprising an ink source and a number of ink cylinders;
d. and transferring the pattern on the printing plate to a rubber blanket and further to printing paper to finish printing.
Preferably, the thickness of the hard surface layer on the water-homogenizing screen roller (7) is 0.02-300mm, wherein the density of the reticulate distribution is 10-1500L/inch, and the reticulate depth is 0.02-2 mm.
Preferably, the wetting fluid is selected from municipal water, tap water, river water, lake water, ground water, purified water, demineralized water, without a wetting stock solution. Wherein the absence of a wetting stock is meant to be the absence of any additional artificially added chemical agents.
To facilitate understanding of the present invention, relevant terms in the art are explained as follows:
the "printing plate" is a metal plate with a thickness of about 0.3mm, and is a carrier for printing the graphic and text elements.
A "plate cylinder" is a cylinder that carries a printing plate, which is typically mounted on a cylindrical outer surface of the plate cylinder and rotates as the plate cylinder rotates.
An "ink application system" includes a source of ink and a series of ink rollers that progressively spread the ink thin while rotating and ultimately transfer it to a printing plate in a patterned manner.
The "fountain solution application system" includes a source of fountain solution and a series of fountain solution rollers that progressively spread the fountain solution as it rotates and ultimately transfer it in a patterned manner to the plate.
"dampening liquid" means a liquid that serves to separate image and non-image areas in web printing, the main component of which is water. In conventional rotogravure systems, a dampening solution must also be added to the dampening solution. However, in the present invention, the wetting liquid may be only municipal water, tap water, river water, lake water, ground water, purified water, softened water, which may be used as they are, and may contain various impurities naturally occurring without additionally adding other chemical agents thereto at will.
The "wetting stock solution" is an additive solution to be added to the wetting solution, and mainly includes alcohols, ethers, surfactants, and the like, and also includes various chemicals such as a protective agent, a wetting agent, a pH adjuster, a buffer, an antibacterial agent, and a surfactant. In the printing industry, various chemicals such as fountain protectants, wetting agents, pH adjusters, buffers, antimicrobials, surfactants, etc., as described above, are often formulated into reagent packs, referred to as "fountain solutions," to maintain the proper functioning of the fountain solution.
"emulsification" refers to a phenomenon in which printing ink is attacked by dampening solution in rotary printing. The emulsification phenomenon will cause the ink marks of the printing ink to be fuzzy and the adhesion degree to be weakened, thereby causing the printing quality to be reduced, and the emulsification should be avoided.
"smudging" refers to the phenomenon in which the amount of dampening solution supplied is insufficient to separate the image and non-image areas on the plate, so that the non-image areas are also printed with ink. The floating phenomenon will cause the printing quality to be reduced and should be avoided.
"ink misting" means that ink is cut or stretched into ink filaments by a physical or chemical factor such as a rotational centrifugal force or a drag force at two ink rollers which are in contact with each other during transfer of the offset ink, and the ink filaments are broken when the ink filaments are further stretched, and the broken ink filaments are spherical due to surface tension. At this time, the electric double layer existing at the interface of the ink yarn fragments is broken, a part of the ink yarn fragments remain in the ink body, and the other part of the ink yarn fragments escape to the atmosphere with opposite charges, forming ink droplets. In practice, the severity of the ink misting is usually assessed by placing a sheet of white paper in contact with the rollers, letting the ink misting strike the white paper, and manually observing the density of the ink dots after a period of time.
"dot reduction" refers to a printing phenomenon in which the active area of a dot on a printing plate is reproduced on a substrate. The higher the dot reduction degree is, the better the printing effect is.
The term "fountain roll" refers to the roll of the series of fountain rolls that is in direct contact with the printing plate, and the uniform spreading of the layer of fountain solution to the surface of the fountain roll directly determines the uniform spreading of the layer of fountain solution on the printing plate.
"dampening water fountain roll" refers to a metal roll (20-30 mm lateral cross-over) that can be moved laterally and longitudinally in a dampener application system in a rotary printing press.
The water-homogenizing rubber roller is a rubber roller which is arranged between the water-mixing roller 4 and the plate water roller 6 and is made of rubber. In the present invention, the "water distribution rubber roll" functions to spread the dampening solution and transfer it from the dampening roller to the clich é roller.
In the preferred embodiment of the present invention, the texture of the water-spreading textured roller 7 is linear texture or honeycomb texture, but is not limited to linear texture or honeycomb texture, and other types of texture can be used. The linear reticulation refers to reticulation formed by a plurality of parallel broken lines and curves.
In a preferred embodiment of the present invention, the ceramic layer of the water-spreading screen roller 7 has a thickness of 0.02 to 300mm, the linear screen has a distribution density of 10 to 1500L/inch, and the screen depth is 0.01 to 2 mm. The hard surface layer may be prepared on the outer surface of the metal roll to form a coating by any suitable means, such as by ionizing spray, porcelain, and the like.
After the hard surface layer is prepared on the water-homogenizing mesh roller, the hard surface layer can be finely processed to improve the surface smoothness of the hard surface layer, and then the mesh is carved in a laser electronic carving mode.
In the present invention, the alcohols or ethers include: ethanol, isopropanol, ethylene glycol, propylene glycol methyl ether, ethylene glycol, and the like.
The inventor carries out a series of experiments and finally demonstrates that: in the existing rotary printing system, the water-homogenizing screen line roller with the structure characteristics is added and is in extrusion contact with the plate water roller to rotate oppositely, so that the wetting liquid can be uniformly spread to form a film under the condition that the wetting liquid is common tap water without adding alcohols or ethers and any wetting stock solution, and the printing effect of the rotary printing system is even better than that of the rotary printing system with the wetting stock solution. For a long time, the field of rotary press printing is to promote the wetting liquid to be thinned into a film by a chemical mode of adding the wetting stock solution containing chemical agents (such as adding alcohol, isopropanol, ethers and the like), and the invention completely uses a physical method to solve the problems.
Compared with the prior art, the invention has the following beneficial effects:
1. safety and environmental protection: the wetting stock solution is not added at all, and no alcohol, ether substances or other chemical agents are added, so that the environment of a printing workshop is greatly improved, the health of staff is facilitated, and the fire hazard is eliminated; the discharge of waste gas and waste liquid is greatly reduced, and the natural environment is improved.
2. The cost is saved: the cost of purchasing the wetting stock solution by printing enterprises is saved, and the environmental protection tax is also reduced.
3. The printing effect is improved: because the wetting liquid is completely free of components capable of diluting or dissolving the printing ink, the printing ink and the wetting liquid cannot be mutually corroded at the junction of the printing ink layer and the wetting liquid layer, and the oil-water incompatibility is really realized. Therefore, the product has stable color phase, good drying and good halftone dot color phase reduction.
Drawings
FIG. 1 is a schematic diagram of a rotary printing system.
FIG. 2 is a schematic view of the honeycomb texture of the surface of a hydroentangling textured roll.
The reference numerals in the figures have the following meanings:
1-a plate cylinder; 2-a dampener solution application system; 3-an ink application system; 4-a dampening shoe; 5-water homogenizing rubber roller; 6-to plate water roller; 7-Water-homogenizing mesh roller
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Comparative example 1
A newspaper web printing system as shown in figure 1 is used. The system is a Uniset75 newspaper rotary press, Manland, Germany, all using its original ink path system, which differs from the present invention in that no flood screen roller is used. During the printing process, if a special wetting stock solution is not added to the wetting solution or the content of the wetting stock solution is too low, printing cannot be performed. In order to maintain normal printing, the addition ratio of the wetting stock solution should be 3-5 wt%.
Example 1
In this example, a Uniset75 newspaper rotary press from Mannheim, Germany was still used, but a water-levelling wire roller was added, the roller surface of which was characterized by the following structure and shape: the metal roller blank comprises a metal roller and a hard surface layer covering the outer surface of the metal roller, the hard surface layer is a ceramic layer, a honeycomb pattern layer is arranged on the outer surface of the hard surface layer, the hard surface layer is further subjected to fine processing after being prepared on the metal roller so as to improve the surface smoothness of the hard surface layer, and the reticulate pattern is carved in a laser electronic carving mode. The wetting solution used in this example was plain municipal tap water without any wetting stock solution. Experimental results show that the wetting liquid does not corrode the surface of the ink during printing, the printing performance is good, and the printing failure is well improved.
Example 2
In this example, a Uniset75 newspaper rotary press from Mannheim, Germany was still used, but a water-spreading screen roller was added, the roller structure and shape characteristics of which were as follows: the metal roller blank, metal roller blank outermost layer parcel has the stereoplasm top layer, and the material on this stereoplasm top layer is the chromium steel to directly carve out honeycomb shape reticulation on this stereoplasm top layer through laser electron glyptic mode. The wetting solution used in this example was plain municipal tap water without any wetting stock solution. Experimental results show that the wetting liquid does not corrode the surface of the ink during printing, the printing performance is good, and the printing failure is well improved.
Example 3
In this example, a Uniset75 newspaper rotary press from Mannheim, Germany was still used, but a water-spreading screen roller was added, the roller structure and shape characteristics of which were as follows: the metal roller blank, metal roller blank outermost layer parcel have the stereoplasm top layer, and the material on this stereoplasm top layer is the glass steel to directly carve out honeycomb shape reticulation through laser electron glyptic mode on this stereoplasm top layer. The wetting solution used in this example was plain municipal tap water without any wetting stock solution. Experimental results show that the wetting liquid does not corrode the surface of the ink during printing, the printing performance is good, and the printing failure is well improved.
Experiment of printing effect
The printing effects of the above comparative example 1 and example 1 were examined with a newspaper having a high printing quality requirement. The newspaper is of 16 quarto versions, the number of prints is 9.6 ten thousand, four colors and full color.
The results of the experiment are as follows:
from the experimental results of comparative example 1 and examples 1 to 3, it can be concluded that: the non-wetting stock solution rotary printing system not only saves cost, reduces pollution and improves production efficiency, but also greatly improves the drying degree, the dot reduction rate and the like of the printing ink.
From the above results, it can be seen that the dampening solution-free rotary printing system of the present invention can achieve the same or even better printing effect than the conventional rotary printing system with the dampening solution added thereto without adding any dampening solution to the dampening solution due to the addition of the water-evening patterned roller having the specific surface characteristics at the specific position.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A dampening free stock-solution rotary printing system comprising the following components:
a plate cylinder (1) having a printing plate mounted on a cylindrical outer surface thereof;
an ink application system (3) comprising an ink source and a number of ink cylinders for applying ink to the printing plate;
a dampening fluid application system (2) comprising a source of dampening fluid and a plurality of dampening fluid rollers for applying dampening fluid to the printing plate; wherein the wetting liquid rollers comprise a water distributing roller (4), a water homogenizing rubber roller (5) and a plate water roller (6);
the method is characterized in that:
the dampening solution applying system (2) further comprises a water-homogenizing screen roller (7), the water-homogenizing screen roller (7) is in contact with the plate-arriving water roller (6), the water-homogenizing screen roller (7) comprises a hard surface layer with Mohs hardness larger than 3, the hard surface layer is provided with screens, and the water-homogenizing screen roller (7) is in extrusion contact with the plate-arriving water roller (6) and rotates oppositely;
the wetting stock solution refers to an additive solution added to the wetting solution.
2. The web-fed, web-fed rotary printing system of claim 1, wherein the web is a line web or a honeycomb web.
3. The web-fed, non-wetting master batch rotary printing system of claim 2, wherein the rigid top layer has a thickness of 0.02-300mm, the web has a distribution density of 10-1500L/inch, and the web has a depth of 0.02-2 mm.
4. The web-fed printing system of claim 1, wherein the hard top layer is a metal layer, a ceramic layer or a glass layer.
5. The web-fed rotary printing system according to claim 1, wherein the dampening rubber roller (5) is in counter-rotating contact with the fountain roller (6); the water mixing roller (4) is in opposite rotating contact with the water homogenizing rubber roller (5); the water mixing roller (4) is a metal roller or a hard surface layer covers the outer surface of the metal roller, and the outer surface of the water mixing roller (4) is a smooth surface or has a reticulate pattern.
6. A non-wetting stock solution rotary printing method is characterized by comprising the following steps:
a. mounting a printing plate on the cylindrical outer surface of the printing plate cylinder;
b. applying a wetting fluid to the printing plate by a wetting fluid application system to form a patterned wetting fluid film, wherein the wetting fluid application system comprises a wetting fluid source and a plurality of wetting fluid rollers, and the plurality of wetting fluid rollers comprise a water distributing roller (4), a water distributing rubber roller (5), a plate water distributing roller (6) and a water distributing screen roller (7); wherein the water-homogenizing screen roller (7) is contacted with the plate water roller (6), and the water-homogenizing screen roller (7) comprises a hard surface layer with Mohs hardness more than 3, and the hard surface layer is provided with screens;
c. applying ink to areas of the printing plate not covered by the patterned dampening liquid film by an ink application system comprising an ink source and a number of ink cylinders;
d. transferring the pattern on the printing plate to a rubber blanket and further transferring the pattern to printing paper to finish printing;
the wetting stock solution refers to an additive solution added to the wetting solution.
7. The web-fed printing process of claim 6, wherein the hard cover layer on the fountain-screen roller (7) has a thickness of 0.02 to 300mm, and wherein the web density is 10 to 1500L/inch and the web depth is 0.02 to 2 mm.
8. The method of claim 6, wherein the fountain solution is selected from the group consisting of municipal water, tap water, river water, lake water, ground water, purified water, and demineralized water, and wherein the fountain solution is free of alcohols and ethers.
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| CN201811066122.5A CN109291620B (en) | 2018-09-13 | 2018-09-13 | Wetting-free stock solution rotary printing system and printing method |
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| CN110239202B (en) * | 2019-06-26 | 2023-06-23 | 云南卓印科技有限公司 | Lithographic printing rubber water roller and preparation method thereof |
| CN112937078A (en) * | 2021-04-06 | 2021-06-11 | 云南卓印科技有限公司 | Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method |
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| EP2242651A2 (en) * | 2008-02-12 | 2010-10-27 | Heidelberger Druckmaschinen AG | Rotary flat-bed printing machine |
| CN101817252B (en) * | 2010-04-08 | 2012-01-25 | 云南侨通包装印刷有限公司 | Ceramic anilox water channeling roll and manufacturing method |
| CN106585071B (en) * | 2015-10-14 | 2018-04-17 | 云南卓印科技有限公司 | A kind of zero alcohols lithographic system |
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