CN112937078A - Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method - Google Patents
Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method Download PDFInfo
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- CN112937078A CN112937078A CN202110367620.9A CN202110367620A CN112937078A CN 112937078 A CN112937078 A CN 112937078A CN 202110367620 A CN202110367620 A CN 202110367620A CN 112937078 A CN112937078 A CN 112937078A
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- 238000007639 printing Methods 0.000 title claims abstract description 73
- 238000009736 wetting Methods 0.000 title claims abstract description 57
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000011550 stock solution Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000000243 solution Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000007645 offset printing Methods 0.000 claims abstract description 19
- 239000008399 tap water Substances 0.000 claims abstract description 8
- 235000020679 tap water Nutrition 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003673 groundwater Substances 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims 2
- 238000001125 extrusion Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 15
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000126 substance Substances 0.000 description 11
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- 239000002344 surface layer Substances 0.000 description 5
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- 230000000052 comparative effect Effects 0.000 description 3
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- 238000002360 preparation method Methods 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 2
- -1 fountain protectants Substances 0.000 description 2
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Images
Classifications
-
- 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
- B41F7/26—Damping devices using transfer rollers
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
Abstract
The invention belongs to the field of offset printing, and particularly relates to an offset printing machine wetting device free of alcohol and wetting stock solution, an offset printing machine and a printing method. The wetting apparatus includes: at least four dampener rolls, wherein one dampener roll is in simultaneous contact with the remaining three dampener rolls. The invention develops a new method, improves the wetting effect by skillfully designing the position arrangement of the wetting liquid roller, and specifically comprises the following steps: the cross section of three contact positions forms a triangle by adopting a structure that the water distributing roller (4) is simultaneously contacted with the water bucket roller (2), the brush roller (3) and the plate leaning water roller (5). Therefore, the tearing effect on the wetting liquid is formed by the three water rollers rotating at high speed and the mutually extruded surfaces of the three water rollers, the surface tension of water is overcome in a physical mode, the wetting liquid can be uniformly spread to form a film under the condition that the wetting liquid is common tap water (alcohol, isopropanol and fountain solution are not added), and the printing effect of the film is even better than that of the film in the presence of alcohol or wetting stock solution.
Description
Technical Field
The invention belongs to the field of offset printing, and particularly relates to an offset printing machine wetting device free of alcohol and wetting stock solution, an offset printing machine and a printing method.
Background
Offset printing, also known as offset printing, is a method of repelling water and hydrophilic ink on a printing plate where pictures and texts are located by using the principles of immiscible oil and water and selective adsorption of the printing plate so as to realize coating of the ink on the printing plate; and a thin dampening film is coated on the blank position of the printing plate, the water film has the function of ink repelling and hydrophilicity, and the position covered by the dampening film can not be stained with ink.
In modern offset printing presses, the device that transfers ink to the printing plate is called the inking system or inking system, and the device that transfers dampening water to the printing plate is called the dampening system or dampening system. The dampening device generally includes a tank for refrigeration, a tank for holding and providing dampening water for each color set, a fountain roller, a brush roller, a dampening roller for transferring dampening water, and a dampening roller for directly transferring dampening water to the printing plate. The fountain roller and the dampening roller are metal smooth rollers such as stainless steel rollers and chrome plating rollers, the plate-leaning water roller is a rubber roller, and the rollers are used for controlling a certain amount of water and continuously transmitting dampening water to a printing plate so as to realize normal printing production.
The surface tension of water is 72mM/m, and a uniform and thin water film is not easily formed in general. In order to facilitate smooth formation of the dampening water film, it is necessary to reduce the surface tension of water. Therefore, in the prior art of offset printing, alcohol or alcohol-free wetting stock must be used to reduce the surface tension of water to achieve normal printing production. The dampening stock solution mainly contains alcohols, ethers, surfactants and the like, and also various chemicals such as a dampening water protectant, an antifoaming agent, a wetting agent, a pH adjuster, a buffering agent, an antibacterial agent and the like to maintain the normal function of the dampening water. In the printing industry, various chemicals such as fountain protectants, defoamers, pH adjusters, buffers, antimicrobials, surfactants, etc., as described above, are often used in a kit formulated in proportions referred to as a "fountain solution".
The various chemicals in the fountain solution, while ensuring proper printing, also pose problems: 1. the chemical preparation is volatile, is a main source of VOCs in the printing industry, and has pollution to the atmospheric environment. Especially in relatively closed printing plants, these volatiles can seriously damage the health of the operator. 2. Fountain water containing chemicals cannot be used for a long time, and a large amount of harmful waste water is generated by regular water change. 3. Chemical procurement can significantly increase printing costs. 4. The use of chemicals causes more printing problems. For example, the fountain solution can dissolve and dilute the ink, and the ink surface at the junction of the ink layer and the water layer is easily corroded and decomposed, so that the printing problems of poor ink drying, ink piling, ink flying, unstable hue and the like are caused.
The present invention has been made to solve the above problems.
Disclosure of Invention
The invention provides in a first aspect an alcohol-free and stock solution-dampening device for an offset printing press, the dampening device comprising: at least four dampener rolls, wherein one dampener roll is in simultaneous contact with the remaining three dampener rolls.
The contact position of one wetting device roller and the other three wetting device rollers is three contact positions, the contact positions are in the form of surfaces or lines or points, optional points at each of the three contact positions are connected to form a triangle, and the cross sections of the three contact positions form a triangle.
Preferably, the four dampener rolls are: the water bucket roller 2, the brush roller 3, the water distributing roller 4 and the plate leaning water roller 5; the dampening vibrator roller 4 is simultaneously in pressing contact with three water rollers, namely the water bucket roller 2, the brush roller 3 and the plate leaning water roller 5. This ensures a dosed, even spreading of the wetting fluid.
Preferably, the fountain roller 2, the brush roller 3, the dampening water roller 4, and the clich e roller 5 rotate clockwise or counterclockwise independently of each other.
Preferably, the hard surface layer of the dampening vibrator roll 4 has a texture.
More preferably, the dampening vibrator roll 4 and the plate dampening roll 5 rotate oppositely and move in a left-right mode.
More preferably, the texture is a checkered or honeycomb texture.
More preferably, the thickness of the hard surface layer is 0.01-400mm, the distribution density of the reticulate patterns is 10-900L/cm, and the depth of the reticulate patterns is 0.01-2.5 mm.
More preferably, the hard surface layer is a metal layer, an alloy layer or a ceramic layer.
More preferably, the hard skin has a mohs hardness of greater than 3.
In a second aspect, the present invention provides an alcohol-free and dampening stock solution offset printing press, comprising:
a plate cylinder 6 having a printing plate mounted on a cylindrical outer surface thereof;
an ink application system 7 comprising an ink supply and a number of ink cylinders for applying ink to the printing plate;
a dampening liquid application system 8 comprising a source of dampening liquid and the dampening means of the first aspect for applying dampening liquid to the printing plate.
In a third aspect, the present invention provides a method for printing without alcohol and with a dampening solution, comprising the steps of:
a. mounting a printing plate on the cylindrical outer surface of the plate cylinder 6;
b. applying a dampening solution to the printing plate by a dampening solution application system 8 to form a patterned dampening solution film, the dampening solution application system 8 comprising a source of dampening solution and at least four dampening solution rollers, wherein one dampening solution roller is in simultaneous contact with the remaining three dampening solution rollers;
c. applying ink to areas of the printing plate not covered by the patterned dampening liquid film by an ink application system 7 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 fountain solution is selected from municipal water, tap water, river water, lake water, ground water, purified water, demineralized water, which is free of alcohol or fountain stock solution, and also free of alcohols or ethers. By non-alcoholic or fountain solution is meant that it does not contain 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.
By "dampening water roll" is meant the water roll in the series of dampening water rolls that directly contacts the printing plate, and the uniform spreading of the dampening solution layer to the surface of the dampening water roll directly determines the uniform spreading of the dampening solution layer on the printing plate.
By "dampening water roller" is meant a metal roller in a system for applying dampening water in a rotary printing apparatus that is capable of lateral and longitudinal movement, with a lateral movement distance of 20-30 mm.
The 'bucket roller' refers to a roller which is directly contacted with the wetting liquid in the wetting liquid groove and is used for supplying the wetting liquid to the water mixing roller and controlling the amount of the supplied liquid.
The brush roller is used for carrying water and sprinkling the water to the water mixing roller. The brush roller is generally composed of a metal shaft, a brush filament attachment (plastic pipe, nylon pipe, etc.), and brush filaments
Compared with the prior art, the invention has the following beneficial effects:
1. in the past printing technology, the wetting effect is improved by changing the material of the wetting liquid roller, and the invention develops a new method for improving the wetting effect by skillfully designing the position arrangement of the wetting liquid roller, which specifically comprises the following steps:
the cross sections of the three contact positions form a triangle by adopting a structure that the water distributing roller 4 is simultaneously contacted with the water bucket roller 2, the brush roller 3 and the plate leaning water roller 5. Therefore, the tearing effect on the wetting liquid is formed by the mutually extruded surfaces of the four water rollers rotating at high speed, the tearing effect is generated in the middle range of three contact positions on the surface of the roller, the surface tension of water is overcome in a physical mode, the wetting liquid can be uniformly spread to form a film under the condition that the wetting liquid is common tap water without adding alcohol, isopropanol and fountain solution, and the printing effect of the film is even better than that of the film in the condition that alcohol or wetting stock solution exists. For a long time, the offset printing field is dependent on adding a wetting liquid containing chemical agents, such as alcohol, isopropanol, ethers and the like, which promote the wetting liquid to be thinned and formed into a film in a chemical mode.
2. In the preferred technical scheme, the surface of the water distributing roller is provided with a reticulate pattern which can further improve the performance of the water distributing rollerOvercome the surface tension of waterAnd the effect of spreading the wetting liquid into a film is improved.
3. The wetting liquid of the present invention can be common tap water, and has the following outstanding advantages:
1. green and environment-friendly: chemical preparations such as alcohols, ethers or wetting stock solution and the like are not added at all, so that the environment of a printing workshop is improved, and the health of workers is facilitated; 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 alcohol or wetting stock solution by printing enterprises is saved, and the environmental protection tax is also reduced; 3. the printing effect is improved: the product has stable color phase, good drying and good mesh point reduction.
Drawings
FIG. 1 is a schematic view of an offset dampener.
FIG. 2 is a schematic view of a grid-like texture on the surface of a dampening bar.
The reference numerals in the figures have the following meanings:
1-a wetting fluid; 2-a bucket roller; 3-a brush roller; 4-a dampening shoe; 5-dampening water roller, 6-plate cylinder, 7-ink application system, 8-dampening water application system.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "provided" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
It will be understood by those skilled in the art that, unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Comparative example 1
A newspaper rotary press dampening unit as shown in figure 1 was used. The device is a part of a Gaussian SSC300 newspaper rotary printing machine, is an original wetting device and is different from the invention in that the dampening string roller uses a surface chrome-plated roller. 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. To maintain normal printing, the amount of dampening stock added should be around 2.5 wt% of the total weight of the dampening solution.
Example 1
In the embodiment, a Gaussian SSC300 newspaper rotary printing press is still used, but the dampening device is changed into the offset dampening device free of alcohol and dampening stock solution, and the cylinder of the dampening device comprises a bucket roller 2, a brush roller 3, a water distributing roller 4 and a plate leaning water roller 5; the dampening vibrator roller 4 is simultaneously in pressing contact with three water rollers, namely the water bucket roller 2, the brush roller 3 and the plate leaning water roller 5.
The difference between the moistening device of the Gauss SSC300 newspaper rotary printing machine and the offset printing moistening device without alcohol and moistening stock solution is that the arrangement of a bucket roller 2, a brush roller 3, a water distributing roller 4 and a plate leaning water roller 5 is different, and the structures and the materials of all the rollers are the same. In the offset printing dampening device of the invention, the position relations of the bucket roller 2, the brush roller 3, the water distributing roller 4 and the plate leaning water roller 5 in the dampening liquid applying system 8 are as follows: the dampening vibrator roller 4 is simultaneously in pressing contact with three water rollers, namely the water bucket roller 2, the brush roller 3 and the plate leaning water roller 5. The wetting liquid tank is filled with wetting liquid 1. The water bucket roller 2 is partially positioned in the wetting liquid groove and contacts the wetting liquid 1. The clich e roller 5 contacts the plate cylinder 6. The fountain roll 2 is in contact with the dampening bar 4, and the dampening bar 4 is in contact with the plate dampening bar 5, so that the dampening solution 1 is transferred to the plate cylinder 6 through the fountain roll 2, the dampening bar 4, and the plate dampening bar 5 in sequence. At the same time, the brush roller 3 is in contact with the dampening vibrator 4 at the side for further transfer of dampening solution. The cross section of the three contact positions forms a triangle, and the triangle is shown in figure 1. When the four rollers rotate at high speed, a tearing effect is formed on the wetting liquid 1 flowing through the rollers, and the tearing effect is generated in the middle range of three contact positions on the surface of the roller, so that the wetting liquid can be uniformly spread to form a film. The wetting solution used in this example was plain municipal tap water without any alcohol or wetting stock solution added. Experimental results show that the printing performance is good, and the printing fault is better improved.
Example 2
In this example, a gaussian SSC300 newspaper web press was still used, but the dampening unit was changed to the alcohol-free and dampening stock dampening unit of example 1, and the dampening cylinder 4 was an anilox dampening cylinder, the cylinder structure and shape characteristics of which were as follows: the outmost layer of the carbon roller blank is a hard surface layer made of a silicon nitride layer, the surface smoothness of the roller blank is improved in the spraying preparation process, and honeycombed reticulate patterns are directly engraved on the hard surface layer in a laser electronic engraving mode. The wetting solution used in this example was plain municipal tap water without any alcohol or wetting stock solution added. Experimental results show that the printing performance is good, and the printing fault is better improved.
Application example 1
Experiment of printing effect
The printing effects of the above comparative examples and examples were examined with a newspaper having a high printing quality requirement. The newspaper is four-color 8-edition four-color double-sided color.
The results of the experiment are as follows:
from the experimental results of comparative example 1 and examples 1-2, it can be concluded that: the wetting device free of alcohol and wetting stock solution saves cost, reduces chemical agent pollution, and greatly improves the drying degree of ink, dot reduction and the like.
From the above results, it can be seen that the offset printing dampening device without alcohol and dampening stock solution of the present invention can achieve the same or even better printing effect as the traditional offset printing dampening device with alcohol or dampening stock solution without adding any dampening solution into the dampening solution because the fountain roller 2, the brush roller 3, the dampening roller 4 and the plate-leaning water roller 5 are specifically arranged, so that the dampening roller 4 is in pressing contact with the three water rollers, namely the fountain roller 2, the brush roller 3 and the plate-leaning water roller 5, at the same time.
Claims (9)
1. An alcohol-free and dampening stock dampening system for an offset printing press, said dampening system comprising: at least four dampener rolls, wherein one dampener roll is in simultaneous contact with the remaining three dampener rolls.
2. The alcohol free and fountain solution pad dampening device of claim 1, wherein the four fountain solution rollers are: a water bucket roller (2), a brush roller (3), a water distributing roller (4) and a plate leaning water roller (5); the dampening vibrator roller (4) is in extrusion contact with the three water rollers, namely the water bucket roller (2), the brush roller (3) and the plate leaning water roller (5) at the same time.
3. The alcohol free and fountain solution fountain device of claim 1, wherein the hard surface of the dampening cylinder (4) has a textured surface.
4. The alcohol free and fountain solution fountain device of claim 1, wherein the hard surface of the dampening cylinder (4) has a textured surface.
5. The alcohol-free and fountain solution dampening device of claim 2, wherein the fountain roll (2), the brush roll (3), the dampening water fountain roll (4), and the dampening water fountain roll (5) rotate clockwise or counter-clockwise independently of each other.
6. An alcohol-free and dampening stock offset printing press, comprising:
a plate cylinder (6) having a printing plate mounted on a cylindrical outer surface thereof;
an ink application system (7) comprising an ink source and a number of ink cylinders for applying ink to the printing plate;
a dampening fluid application system (8) comprising a source of dampening fluid and the dampening device of claim 1 for applying dampening fluid to the printing plate.
7. An alcohol-free and wetting stock solution printing method is characterized by comprising the following steps:
a. mounting a printing plate on the cylindrical outer surface of a printing plate cylinder (6);
b. applying a dampening solution to the printing plate by a dampening solution application system (8) to form a patterned dampening solution film, the dampening solution application system (8) comprising a source of dampening solution and at least four dampening solution rollers, wherein one dampening solution roller is in simultaneous contact with the remaining three dampening solution rollers;
c. applying ink to areas of the printing plate not covered by the patterned dampening liquid film by an ink application system (7) 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.
8. The method of printing free of alcohol and fountain solution according to claim 7, wherein the fountain solution is selected from the group consisting of municipal water, tap water, river water, lake water, ground water, purified water, demineralized water, and wherein the fountain solution is free of alcohol and ether.
9. The alcohol-free and fountain solution printing method of claim 7, wherein the four fountain solution rollers are: a water bucket roller (2), a brush roller (3), a water distributing roller (4) and a plate leaning water roller (5); the dampening vibrator roller (4) is in extrusion contact with the three water rollers, namely the water bucket roller (2), the brush roller (3) and the plate leaning water roller (5) at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110367620.9A CN112937078A (en) | 2021-04-06 | 2021-04-06 | Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110367620.9A CN112937078A (en) | 2021-04-06 | 2021-04-06 | Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method |
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| Publication Number | Publication Date |
|---|---|
| CN112937078A true CN112937078A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110367620.9A Pending CN112937078A (en) | 2021-04-06 | 2021-04-06 | Offset press wetting device free of alcohol and wetting stock solution, offset press and printing method |
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| CN (1) | CN112937078A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5540145A (en) * | 1993-02-22 | 1996-07-30 | Keller; James J. | Ink receptive dampening system for lithographic printing press |
| CN1267597A (en) * | 1999-03-17 | 2000-09-27 | 海德堡印刷机械股份公司 | Damping apparatus for printing machine |
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Application publication date: 20210611 |