JP2020062868A - Spray-type dampening water supply device - Google Patents

Abstract

To provide a device which enables improvement of adhesion efficiency of dampening water 70 sprayed from a nozzle 30 of a spray-type dampening water supply device 10 to a water fountain roller 303 and concurrently achieves reduction of an amount of excess dampening water.SOLUTION: A spray-type dampening water supply device 10 sprays dampening water 70 to a peripheral surface of a roller which reaches a printing plate of an offset printer and includes dampening water guide plates 20, each of which is water-repellent and has an inclined part 23 inclined toward a water fountain roller 303 at the inner side, at an interior of the spray-type dampening water supply device 10 as seen in a circumferential direction. Furthermore, the spray-type dampening water supply device 10 includes a multiple structure cover in an axial direction of the spray-type dampening water supply device 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spray-type fountain solution supply device for an offset printing machine.

  In the offset printing, the supplied hydrophilic fountain solution covers the non-image area of the printing plate, and then the lipophilic ink is applied to the image area. Printing printed matter such as newspapers is performed by preventing ink from getting on non-image areas. The basic role of dampening water is to cover the non-image area and prevent ink from adhering. In offset printing, fountain solution occupies a very important weight.

  The offset printing machine is generally equipped with a dampening water supply device that supplies dampening water to the surface of the printing plate through rollers, and a water boat type and a spray type are known, but especially for newspapers. An offset rotary press is often equipped with a spray-type fountain solution supply device. The dampening water is supplied from a plurality of nozzles attached to the spray-type dampening water supply device, for example, eight nozzles in a newspaper offset rotary press to supply the dampening water to the water source roller. The dampening water is supplied to the surface of the printing plate by being sprayed intermittently in the shape of an elliptical fan in the axial direction and the circumferential direction of the water source roller.

  While the importance of fountain solution in offset printing is high and many patents relating to fountain solution have been filed, the demand for performance required for fountain solution is still diverse. As part of the contents, prevention of roller strip phenomenon, prevention of decay of dampening water, formation of uniform water film thinner than the current state, prevention of emulsification with ink, spreading of ink film on dampening water There is a background that there are demands such as preventing it, having the ability to clean the plate surface, not evaporating on the plate surface too quickly, and that water does not cause problems with the metal etc. of the machine. .

  Some conventional spray-type dampening water supply devices include a spray mask and a mist shield (see, for example, Patent Document 1). In addition, there is a dampening apparatus provided with a diaphragm thin plate for uniformizing dampening water on the upper and lower sides of the casing (for example, refer to Patent Document 2). Then, there is a feature that the spray blocking plate is inclined toward the spray nozzle (for example, refer to Patent Document 3).

  The conventional spray-type fountain solution supply system described above has the following problems. First, although Patent Document 1 includes a mist shield, the mist shield requires an air compressor, which requires a huge initial cost and a running cost. Even if air is not used during printing, the cost of the air compressor device will certainly be incurred at the beginning. From the viewpoint of cost reduction, it is not realistic that the initial cost and running cost are enormous as customer needs.

  Next, in Patent Document 2, a diaphragm thin plate is installed which shields the spray continuously sprayed from the spray nozzle perpendicularly to the longitudinal direction of the water fountain roller. It has been proposed as a means to control the amount of spray water that reaches the water-source roller, but due to the wide variety of forming of the drawn thin plate, confusion such as the cost of manufacturing all patterns and which pattern to attach may occur. Absent. And, with this means, it is unlikely that the shielded spray will be scattered and a proper amount of spray can be supplied.

  Next, Patent Document 3 discloses a first spray shield plate, a second spray shield plate, a third spray shield plate, and an integrated spray shield plate or a split spray shield that are arranged in the longitudinal direction of the dampening roller. The plate is characterized by being inclined (partly parallel) to the spray nozzle side with respect to the spray crossing position, but there are various shapes even at the tip of the shielding plate, and the mounting position is also different. In view of this, there is a problem, and when replacing, it may cause confusion as to which part should be installed and where. Especially for newcomers, the psychological burden increases. It is not a simple structure and it cannot be said that it can be easily attached and replaced.

JP, 2017-13416, A JP-A-5-193090 JP, 2010-46799, A

  The dampening water particles that could not adhere to the water source roller leak out as excess dampening water from the gap between the cover and the water source roller in the axial and circumferential directions of the dampening water supply device. The dampening water supply device itself has a cover that traps the particles and drops them into the drain pan.

  However, the water source roller rotates in the circumferential direction according to the printing speed, oscillates (oscillates) in the axial direction, and supplies dampening water to the next roller. There is always a gap between the cover and the water source roller so that the dampening water is not scraped off. Therefore, some of the excess dampening water particles leak to the outside through this gap. Excessive dampening water particles that have leaked to the outside can contribute to dew condensation during long-term printing. Condensation causes rust on the machine, and water drops that have fallen from the condensation during printing may cause defects on the printing paper surface.

  The present invention enhances the efficiency of attachment of dampening water discharged from a spray dampening water supply device to a water source roller during printing, and at the same time, excess dampening water leaking from the spray dampening water supply device is sprayed. To reduce the amount of leakage to the outside from the gap between the cover and the water source roller in the axial and circumferential directions of the dampening water supply device, without requiring a large-scale device or modification.

In order to solve the above-mentioned problems, a spray-type fountain solution supply device according to claim 1 of the present invention comprises:
In a spray-type dampening water supply device that sprays dampening water from a plurality of spray nozzles through the rollers of an offset printing machine and supplies it to the plate surface,
Having a dampening water guide plate arranged in the circumferential direction of the spray type dampening water supply device,
With respect to dampening water sprayed from the plurality of spray nozzles, the gap between the dampening water guide plate and the water source roller is adjustable, and is inclined toward the inside toward the water source roller. It is characterized by that.

  In the present invention, the inventor pays attention to the mechanism of leakage of excess dampening water particles from the axial direction and the circumferential direction of the water source roller, and the dampening water guide plate inclined toward the inner side toward the water source roller. By installing, it became possible to change the orbit of the dampening water particles discharged from the nozzle in an elliptical fan shape, and to attach the dampening water more efficiently to the water source roller.

  More specifically, the dampening water particles in contact with the dampening water guide plate are reflected by the inclination of the dampening water guide plate toward the center of the water source roller. Since the dampening water particles reach the surface of the water source roller vertically, the ground contact surface spreads and is easily attached to the water source roller.

A spray type dampening water supply apparatus according to claim 2 of the present invention is the spray type dampening water supply apparatus according to claim 1,
The dampening water guide plate is water repellent.

  Since the dampening water guide plate is water repellent, the dampening water particles in contact with the dampening water guide plate are reflected or run up the water repellent surface according to the inclination of the dampening water guide plate, and the center of the water source roller. Head to. As described above, the dampening water particles reach the surface of the water source roller perpendicularly, so that the ground contact surface spreads and is easily attached to the water source roller.

A spray-type dampening water supply apparatus according to claim 3 of the present invention is the spray-type dampening water supply apparatus according to claims 1 and 2.
The dampening water guide plate is attached to an opening / closing door or a cover of the spray type dampening water supply device.

  The structure that the dampening water blocking plate with water repellent treatment is fixed inside the opening / closing door or cover of the conventional spray type dampening water supply device with bolts, so even experienced or newcomers can easily install and adjust. It is possible to perform the work efficiently even when it is removed by cleaning or the like.

  The effect can be achieved by simply using the conventional spray-type dampening water supply device and attaching the dampening water blocking plate, so that new cost is not added.

A spray type dampening water supply apparatus according to claim 4 of the present invention is the spray type dampening water supply apparatus according to any one of claims 1 to 3.
Having a dampening water blocking plate arranged in the axial direction of the spray type dampening water supply device,
A gap between the dampening water blocking plate and the water source roller can be adjusted, and the dampening water blocking plate has a multiple structure provided on the inner surface of the axial side surface cover of the spray dampening water supply device.

  By installing the dampening water blocking plate, the water source roller oscillates (oscillates) during printing. Therefore, the axial cover and the dampening water blocking plate have a multi-layered structure, so that the water source roller shaft It is possible to reduce the excess dampening water that tends to leak from the end surface.

A spray type dampening water supply apparatus according to claim 5 of the present invention is the spray type dampening water supply apparatus according to any one of claims 2 to 4.
The surface tension of the water repellent surface of the dampening water guide plate is 30 mN / m (millinewton / meter) or less.

  Usually, organic compounds existing in printing peripheral members containing dampening water containing a printing ink or a surfactant and impurities such as dust floating in the environment have a surface tension of 35 mN / m or more. By setting the surface tension of the water repellent surface of the dampening water guide plate to 30 mN / m, the dampening water guide plate having a small surface tension can be repelled by the surface tension of the deposits larger than the surface of the dampening water guide plate. It becomes difficult to adhere to the surface of the dampening water guide plate. That is, the water repellent effect of the present invention can be obtained for a long time by setting the above value.

A spray type dampening water supply apparatus according to claim 6 of the present invention is the spray type dampening water supply apparatus according to any one of claims 2 to 5.
Regarding the liquid surface tension Sp1 of the ink used in the offset printing machine equipped with the spray type dampening water supply device and the surface tension Sp2 of the water repellent surface of the dampening water guide plate, Sp2-Sp1 <0. Is characterized by.

  Since the surface tension of the water-repellent surface of the dampening water guide plate is clearly smaller than the surface tension of the ink, it is possible to exert an antifouling effect against the scattering of ink or the like which is also an oily pollutant.

A spray dampening water supply apparatus according to claim 7 of the present invention is the spray dampening water supply apparatus according to any one of claims 2 to 6.
The water repellent material used on the water repellent surface of the dampening water guide plate,
Polytetrafluoroethylene, copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene, propylene hexafluoride, vinylidene fluoride, polysiloxane compound such as condensation reaction type silicone rubber, heat reaction type silicone rubber or room temperature curing type silicone rubber It is characterized by containing any one of the above.

  By using the above-mentioned water repellent material, the water repellent material has an extremely small surface tension of 19 to 23 mN / m and is chemically stable. Therefore, it is excellent in water repellency, oil repellency and antifouling property. The effect can be realized.

  According to the present invention, since the dampening water guide plate and the dampening water blocking plate of the spray dampening water supply device are configured as described above, the efficiency of attaching dampening water to the water source roller is increased, and at the same time, the surplus A spray-type dampening water that can be easily installed by anyone with a conventional spray-type dampening water supply device that can significantly reduce the amount of dampening water leaking to the outside and also realize antifouling effect. A supply device can be provided.

  It is a schematic side view which shows the spray type fountain solution supply apparatus which concerns on 1st Embodiment.   It is a schematic front view including the partial inner surface which shows the whole spray type dampening water supply apparatus which concerns on this invention.   It is a schematic top view which shows the whole spray type dampening water supply apparatus which concerns on this invention.   1 is an example of a front view of a printing apparatus including a spray type dampening water supply device according to the present invention.   FIG. 5 is a partially enlarged front view of an area surrounded by an ellipse of the printing apparatus shown in FIG. 4.   It is a schematic side view which shows the spray type dampening water supply apparatus which concerns on 2nd Embodiment.   It is an inner surface figure which expands and shows an example of the dampening water cutoff plate shown in FIG.   FIG. 4 is an example of test pattern results according to the present invention, in which the left side shows the results without a dampening water guide plate and the right side shows the results with a dampening water guide plate.

  Hereinafter, a spray-type fountain solution supply device 10 according to first and second preferred embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a case where the spray dampening water supply device 10 according to the present invention is applied to the spray dampening water supply device 10 used in a printing apparatus P (see FIG. 4) such as an offset rotary printing press for newspapers explain.

  FIG. 1 is a schematic side view showing a spray-type fountain solution supply device 10 according to the first embodiment. The spray-type dampening water supply device 10 is provided with the dampening water guide plates 20 both inside the opening / closing door 40 and the cover 50 with the inclined portions 23 facing inward toward the water source roller 303. . The opening / closing door can be opened by a one-touch opening / closing member 41. Although both sides are opened in the figure, only the person who works in the arch inside P1 (see FIG. 4), which is the working direction, may be opened. The advantage of double-opening is that the LS side (left side from the front of the machine, hereinafter simply referred to as "LS side" as appropriate) and the RS side (right side from the front of the machine, hereinafter simply referred to as "RS side") respectively This means that the same spray type dampening water supply device 10 can be installed on both the LS side and the RS side, instead of the dedicated spray type dampening water supply device 10.

  The dampening water guide plate 20 is subjected to a water repellent treatment, and the dampening water guide plate 20 has a water repellent surface 21 on the inside of the dampening water guide plate 20 on the nozzle 30 side. While being obtained, the dampening water 70 is sprayed toward the central portion 303 'of the water source roller. The water-repellent surface 21 may be processed not only on the side where the dampening water 70 hits but also on the entire surface.

  The water-repellent treatment is a treatment that uses a silicone resin, a fluororesin, or the like to have a property of repelling water and the like. In the present invention, for example, fluorine treatment or Teflon (registered trademark) using a fluororesin, and poly Tetrafluoroethylene, a copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene, propylene hexafluoride, vinylidene fluoride, polysiloxane compound such as condensation reaction type silicone rubber, heat reaction type silicone rubber or room temperature curing type silicone rubber It is preferable to use a water repellent material containing any one of them. Even more preferred is a super water repellent treatment.

  By using the water repellent material described above, the water repellent material has an extremely small surface tension of 19 to 23 mN / m and is chemically stable. The effect can be realized.

  The surface tension of the water repellent surface is preferably 30 mN / m (millinewton / meter) or less. Liquids such as water tend to make their surface as small as possible. This tendency is because a kind of tension acts along the surface of the liquid, and this tension is called surface tension. The force per unit length is the magnitude of surface tension. For example, the surface tension of water is about 73 mN / m, and by setting the surface tension of the water repellent surface of the present invention to 30 mN / m or less, the greater the difference in surface tension, the greater the water repellency. That is, there is an effect of repelling well.

  Usually, the organic compound present in the printing peripheral member containing the dampening water 70 containing a printing ink or a surfactant, and impurities such as dust floating in the environment have a surface tension of 35 mN / m or more, By setting the surface tension of the water-repellent surface 21 of the dampening water guide plate 20 to 30 mN / m or less, the dampening water guide plate 20 having a small surface tension can be applied to the surface of the dampening water guide plate 20 (water-repellent finish). The surface tension of the adhered matter larger than that of the surface 21) causes the adhered matter to be repelled and is less likely to adhere to the surface of the dampening water guide plate 20 (the water repellent processed surface 21). That is, the water repellent effect of the present invention can be obtained for a long time by setting the above value.

  Further, regarding the liquid surface tension Sp1 of the ink used in the offset printing machine provided with the spray type dampening water supply device 10 and the surface tension Sp2 of the water repellent surface of the dampening water guide plate, Sp2-Sp1 <0. Preferably there is.

  By setting the liquid surface tension of the ink used in the offset printing machine equipped with the spray-type dampening water supply device 10 to Sp2-Sp1 <0, the offset printing machine always uses the printing ink for printing. Therefore, the dampening water 70 and the printing ink may be mixed in the inside of the printing machine and scattered as mist or the like. The liquid surface tension of the printing ink used is preferably larger than the surface tension of the water repellent processed surface 21 of 30 mN / m described above, and the water repellent effect can be enhanced by the preferable state. Since the surface tension of the water repellent surface 21 of the dampening water guide plate 20 is clearly smaller than the surface tension of the printing ink, it is possible to exert an antifouling effect against the scattering of ink and the like which are oily pollutants. It will be possible.

  Next, FIG. 2 is a schematic front view showing the entire spray dampening water supply apparatus 10 according to the present invention, including a partial inner surface. In this figure, the inner surface of the spray-type dampening water supply device 10 is shown, and although not normally visible, the fixing position of the opening / closing door 40 or the cover 50 and the dampening water guide plate 20 is shown. The opening / closing door 40 or the cover 50 and the dampening water guide plate 20 are fixed by a plurality of fixing bolts 80, and the gap 304 between the water source roller 303 (not shown) and the spray type dampening water supply device 10 can be adjusted. It has a simple structure. The position of the fixing bolt 80 is not limited to that shown in the figure, and the opening / closing door 40 or the cover 50 and the dampening water guide plate 20 may be integrated. The spray-type dampening water supply device 10 is installed in the printing device P (not shown) by the fixed bar 200, and the opening / closing door 40 has a structure that can be easily opened and closed by the one-touch opening / closing member 41.

  The dotted line portion in FIG. 2 shows a spray condition in which the dampening water 70 is sprayed from each nozzle 30. For example, in the offset rotary printing press for newspapers, the dampening water 70 is supplied to the water source roller 303 by the eight nozzles 30, so that the dampening water 70 is supplied from one nozzle 30 in the axial direction of the water source roller 303, in a circle. It is sprayed in the shape of an elliptical fan in the circumferential direction.

  Next, FIG. 3 is a schematic top view showing the entire spray dampening water supply apparatus 10 according to the present invention. A plurality of nozzles 30 are arranged, and the positions of the opening / closing door 40 or the cover 50, the dampening water guide plate 20, and the dampening water blocking plate 100 described later are simply shown. From the conventional structure, only the dampening water guide plate 20 and the dampening water blocking plate 100 described later are not provided, and it can be seen that the present invention does not require a large-scale device or the like.

  Next, FIG. 4 is an example of a front view of the printing apparatus P including the spray type dampening water supply apparatus 10 according to the present invention. Only parts particularly relevant to the present invention will be described. As shown in the figure, the dampening water 70 is supplied from the spray-type dampening water supply device 10 in the order of the water source roller 303, the watering rubber roller 302, and the plate cylinder 300 (plate surface 301). A rubber roller, an ink cylinder, and the like having no reference numeral are printed on the web (not shown) from the blanket cylinder 400, though the description thereof is omitted because it is already known from the publication of Japanese Patent No. 2864225. Hereinafter, the printing device P will be referred to as a unit. It can be seen that two spray-type dampening water supply devices 10 are required per unit. For example, it is understood that eight spray-type fountain solution supply devices 10 are required for a so-called one tower, because four units are required for color printing on a rotary offset printing press for newspapers. The space P1 in the arch is large enough for one person to enter, and two or three people can enter in the same direction, but there is not enough space to pass each other in the area P1 in the arch. Therefore, it is extremely important that the structure is not complicated and the workability is good as in the present invention.

  Next, FIG. 5 is a partially enlarged front view of a region surrounded by an ellipse of the printing apparatus P shown in FIG. The roller path and the arrow until the dampening water 70 reaches the plate surface 301 in the present invention indicate the direction of rotation. The surplus dampening water, which is the subject of the present invention, leaks from the circumferential gap 304 and the axial gap 305 between the spray-type dampening water supply device 10 and the water source roller 303.

  Next, FIG. 6 is a schematic side view showing the spray-type fountain solution supply device 10 according to the second embodiment. In addition to the first embodiment, the dampening water blocking plate 100 is installed.

  The dampening water blocking plate 100 is characterized in that it is installed inside the conventional axial side cover 51 and has a multiple structure. Since it is installed inside the conventional axial side cover 51, it is a large scale. It can be seen that there is no costly equipment or cost. It is preferably water-repellent, but it does not matter if it is not water-repellent. The dampening water cutoff plate 100 is provided with a dampening water cutoff plate adjustment elongated hole 110 capable of adjusting the gap 305.

  The dampening water blocking plates 100 are installed at both ends in the axial direction. The water source roller 303 oscillates (swings) to the left and right. When the dampening water 70 discharged from the nozzles 30 at both axial ends of the water source roller 303 is oscillated by the maximum width oscillation (swing) by the conventional axial side cover 51, the OS side (abbreviation of operation side, Taking the example of the axial direction, which means the operating side, and will be simply referred to as “OS side” below, as an example, the DS side (abbreviation of drive side, which means the driving side) is hereinafter simply referred to as “DS side” as appropriate. Even if the maximum width is oscillated (oscillated), the dampening water 70 discharged from the nozzle 30 does not adhere from the shaft end surface to the half position of the oscillation width. When the maximum oscillation is performed on the OS side from the above-mentioned state, the dampening water 70 adhering to the water source roller 303 tries to move toward the OS side shaft end direction due to inertia, and in some cases, the OS side shaft of the water source roller 303 is moved. The dampening water 70 tries to leak from the gap 305 on the end face. Therefore, in the case described above, the original axial side cover 51 plays a role of preventing this leakage.

  The DS side is the reverse of the above-mentioned contents on the OS side, and the dampening water 70 tends to leak out from the gap 305 on the DS side shaft end surface. Therefore, the original DS side axial side cover 51 prevents this leakage. Play a protective role.

  Next, FIG. 7 is an enlarged internal view of the dampening water blocking plate 100. It is a view seen from the nozzle 30 side on the inner surface of the spray type dampening water supply device 10. The dotted line portion is a portion of the side surface cover 51 that is normally invisible when viewed from the inner surface on the nozzle 30 side. The dampening water guide plate 20 mainly exerts an effect of reducing the amount of surplus dampening water in the circumferential direction of the water source roller 303, but the dampening water blocking plate 100 operates in the axial direction of the water source roller 303. It plays the role of exhibiting the effect of reducing the amount of excess water by damaging the oscillation (oscillation).

  The dampening water blocking plate 100 can be installed simply by fixing it to the axial side cover 51 of the conventional spray dampening water supply device 10 with the fixing bolt 90, and anyone can easily install it. The adjustment method is the dampening water cutoff plate adjustment long hole 110, and therefore the gap 305 between the water source roller 303 and the dampening water cutoff plate 100 can be adjusted simply by moving it up and down, which is easy. . It is designed so that anyone, veteran or new, can make adjustments.

  As shown in FIG. 7, the shape of the dampening water blocking plate 100 is preferably higher on the upper side than the conventional axial side cover 51 and smaller on the other left and right sides and lower side.

  Next, FIG. 8 is an example of a test pattern result according to the present invention. The left shows the results without the dampening water guide plate 20, and the right shows the results with the dampening water guide plate 20. The test was carried out multiple times on the same condition for multiple days, and 5 times of the tests are shown. The trend was similar on multiple days. The conditions are date and time, temperature, humidity, nozzle 30 distance, water supply curve, target object, printing speed, ejection interval, paper, measurement time, and the like. The test method is such that newspaper paper, so-called sash, is wound around the water source roller 303, dampening water is sprayed toward the sash, and the weight of the stencil before and after spraying is measured.

  As a result of the above test, with and without the dampening water guide plate 20, the average difference is 3.71 g when the dampening water guide plate 20 is not provided, and the average difference when the dampening water guide plate 20 is present. Was 1.84 g. 1.84 ÷ 3.71 = 0.495, and 1-0.495 = 0.504, and the amount of dampening water scattered decreased by 50.4%.

  From the test results and the test results on other days, it was confirmed that the installation of the dampening water guide plate 20 reduced the amount of splashed water by 50% or more from all the test results as compared with the case where it was not installed. Also, as will be described later, a water amount distribution test was also conducted, but it does not change significantly, so it can be assumed that it has little effect on printing.

  In the pass / fail judgment of the test result, as a result of testing under the same conditions, a numerical value with a small difference is marked with a circle, and a numerical value with a large difference is marked with x. Although the numerical value varies depending on the amount of water and conditions, the judgment is based on the difference, not the numerical value itself.

  From the result that the amount of scattered water is reduced, it is possible to reduce the amount of dampening water 70 in addition to the reduction of the excess dampening water, which is the subject of the present invention. It is expected that the running cost of the liquid will be reduced, the running cost of the ink will be reduced by reducing the amount of ink used, the condensation of the machine will be reduced, the occurrence of rust will be prevented, and the anti-fouling effect will be obtained by using the water repellent material mentioned above. It was an invention that was extremely effective in that it exhibited.

  Before the verification of the test pattern in FIG. 8, a test of spraying dampening water on each nozzle 30 (a total of 8) was performed by measuring the water distribution with or without the dampening water guide plate 20. It sprayed on the measurement case and compared the water distribution, and confirmed that there was no difference. The same condition refers to the water curve, the printing speed, the interval of spraying the dampening water 70, the measurement time, the distance from the nozzle 30 to the measurement case, and the like.

  By installing the dampening water blocking plate 100 described with reference to FIG. 6 and FIG. 7, the water source roller 303 oscillates (swings) during printing, so that the amount of excess dampening water in the axial direction is reduced. Was confirmed, and further effects could be confirmed.

  INDUSTRIAL APPLICABILITY The present invention allows anyone, regardless of veteran or newcomer, to install the dampening water guide plate 20 on the opening / closing door 40 or the cover 50 of the conventional spray type dampening water supply device 10 because it is water repellent. Cleaning is also easy. For example, in the case of performing 40-page 16-sided color printing with an offset rotary printing press for newspapers, a total of 22 spray-type dampening water supply devices 10 are required. As the number of collars increases, more equipment is required, but the dampening water guide plate 20 can be easily attached and detached at any time, and adjustment is simple with only the upper and lower settings made by the long holes, so some trouble occurs. Even if it does, it is possible to respond immediately.

  Further, since it is simply attached to the opening / closing door 40 or the cover 50 of the conventional spray type dampening water supply device 10, a large-scale device is not required, a large-scale design change is not required, and the cost is minimized. It became possible to do.

  The offset rotary printing press for newspapers uses more printing presses as the number of printing pages increases, so improving workability is a very important weight, and the workability and structure are easy to understand. Is important. It is easy to do and anyone can make adjustments and exchanges, which leads to a reduction in labor costs.

  Due to the above, not only cost reduction of printing paper (printing paper), ink, and so-called printing materials such as H liquid and raw water, which are high printing costs in printing newspapers, but also for newcomers and veterans By reducing the labor cost by improving workability without having to work, and by reducing the amount of excess moistened water leaking out, it is also possible to reduce the condensation of the machine, which becomes a factor of rust, Since the work of removing rust requires a great deal of labor, eliminating it makes it possible to meet the needs of customers.

  The present invention is not limited to the shape, size, material, etc. of each constituent element described in the above-mentioned embodiment, and can be appropriately changed within the range where the effect of the present invention can be exhibited. Needless to say.

10 spray type dampening water supply device, 20 dampening water guide plate, 21 water repellent surface, 22 edge, 23 slanted part, 30 nozzle, 40 opening / closing door, 41 one-touch opening / closing member, 50 cover, 51 side cover, 70 dampening Fountain solution, 80, 90 fixing bolts, 100 dampening water blocking plate, 110 oblong holes for dampening water blocking plate, 200 fixing bar, 300 plate cylinder, 301 plate surface, 302 wet rubber roller, 303 water base roller, 303 ′ Water source roller center, 304, 305 gap, 400 blanket cylinder, P printing device, P1 arch

Claims (7)

In a spray-type dampening water supply device that sprays dampening water from a plurality of spray nozzles through the rollers of an offset printing machine and supplies it to the plate surface,
Having a dampening water guide plate arranged in the circumferential direction of the spray type dampening water supply device,
With respect to dampening water sprayed from the plurality of spray nozzles, the gap between the dampening water guide plate and the water source roller is adjustable, and is inclined toward the inside toward the water source roller. A spray type dampening water supply device characterized in that   The spray-type dampening water supply device according to claim 1, wherein the dampening water guide plate is water-repellent.   The spray dampening water supply apparatus according to claim 1 or 2, wherein the dampening water guide plate is attached to an opening / closing door or a cover of the spray dampening water supply apparatus. Having a dampening water blocking plate arranged in the axial direction of the spray type dampening water supply device,
The dampening water blocking plate has a multiple structure in which a gap between the dampening water blocking plate and the water source roller can be adjusted and which is arranged on an inner surface of an axial side surface cover of the spray type dampening water supply device. The spray-type fountain solution supply device according to any one of 1 to 3.   The spray dampening water supply device according to any one of claims 2 to 4, wherein the surface tension of the water repellent surface of the dampening water guide plate is 30 mN / m (millinewton / meter) or less. Regarding the liquid surface tension Sp1 of the ink used in the offset printing machine provided with the spray type dampening water supply device and the surface tension Sp2 of the water repellent surface of the dampening water guide plate,
Sp2-Sp1 <0, The spray type dampening water supply apparatus of Claim 2 to 5 characterized by the above-mentioned. The water repellent material used on the water repellent surface of the dampening water guide plate,
Polytetrafluoroethylene, copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene, propylene hexafluoride, vinylidene fluoride, polysiloxane compound such as condensation reaction type silicone rubber, heat reaction type silicone rubber or room temperature curing type silicone rubber 7. The spray-type fountain solution supply device according to claim 2, which contains any one of the above.

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