JP3572278B2 - Plate development method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plate surface developing method for developing a plate surface having different characteristics to a developing solution with a developing solution in accordance with an image, and more particularly, to a plate surface developing method for developing a plate surface formed on a plate cylinder with a developing solution. About the method.
[0002]
[Prior art]
In offset printing presses, a preprinted PS plate (plate surface) is mounted on a plate cylinder, dampening water and ink are supplied to the plate cylinder, and the image on the PS plate is transferred to the blanket cylinder by the repelling action of the dampening water and ink. And prints on paper. To make a PS plate, it is necessary to expose the plate material, form an image on the plate material, and develop the plate material on which the image has been formed. As a developing method, a liquid developing method is used.
[0003]
FIG. 8 is an explanatory diagram of a conventional plate surface developing method. A developing container 100 containing a developing solution 110 is provided at the lowermost portion of the plate cylinder 11, and a plate surface is mounted on the plate cylinder 11. This plate surface was obtained by image-exposing a plate surface forming material. The plate surface has a property that the solubility in the developing solution 110 varies depending on the image.
[0004]
Accordingly, the plate cylinder 11 is rotated to sequentially pass each portion of the plate surface through the developing solution 110 in the developing container 100 to dissolve the image portion (or non-image portion) of the plate surface of the plate cylinder 11 and develop the plate surface. can do. Since this development proceeds by a chemical reaction between the developing solution and the plate surface, conventionally, the progress of development is controlled by the passage time (immersion time) of the plate surface in the developing solution, and an appropriate development of the plate surface is performed. Had gone.
[0005]
[Problems to be solved by the invention]
However, in this method, since the plate surface passes through the developing solution, it is necessary to store a certain amount of the developing solution in the developing container. For this reason, the developing solution tends to be scattered along with the passage of the plate surface, and when another unit is provided in the apparatus, there is a problem that the other unit is soiled and the function is easily deteriorated. There is also a problem that the position with respect to is limited and the degree of freedom of arrangement is small.
[0006]
In order to prevent the developing solution from scattering in the developing container, it is effective to enlarge the developing container provided at the lowermost portion of the plate cylinder. However, when the size of the developing container is increased, there is a problem that the size of the device accommodating the developing device is increased.
[0007]
For example, in order to eliminate the work of replacing the plate surface, in a plate-reproducing printing machine that performs plate making on a printing machine, a photosensitive resin is applied to the plate cylinder, the photosensitive resin is exposed, and then developed with a developing solution. Then, create a printing plate on the plate cylinder. Then, fountain solution and ink are supplied to the plate surface of the plate cylinder, an image on the plate is transferred to the blanket cylinder by the repelling action of the fountain solution and ink, and printing is performed on paper (for example, Japanese Patent Laid-Open No. 1-152459). Publication). In this printing press, it is necessary to provide a plate making mechanism including a developing device in addition to the dampening solution and the ink supply device around the plate cylinder. If the developing device is large, the printing press itself becomes large. However, there is a problem that it is difficult to realize a small plate-reproducing printing press.
[0008]
Accordingly, an object of the present invention is to provide a plate surface developing method for preventing the scattering of the current image processing solution.
[0010]
Another object of the present invention is to provide a plate surface developing method suitable for a plate making mechanism on a printing press.
[0011]
Still other objects and advantages of the present invention will become apparent from the following description.
[0012]
[Means for Solving the Problems]
In order to achieve this object, a plate surface developing method of the present invention provides a printing machine provided with a plate cylinder and a developing solution applying device at a fixed position with respect to the rotation of the plate cylinder. so as to have a characteristic with respect to the processing liquid different properties with respect to the plate surface that has been prepared in the plate cylinder, the developing solution is allowed to act, a printing plate developing method for developing the plate surface, the pre Kigen image processing liquid coating device , the plate cylinder rotates, the developing solution film thickness is controlled, was applied at predetermined time intervals on the plate surface, by utilizing a plurality of revolutions of the plate cylinder, developing the entire periphery on the printing plate The processing solution is replaced with a new developing solution a plurality of times at predetermined time intervals, and the progress of the development is controlled by the coating film thickness of the developing solution and the replacement frequency of the developing solution. .
[0013]
In the present invention, for applying the proper amount of development agent on the plate cylinder, it can be prevented from scattering developing agent. Further, using the rotation of the plate cylinder a plurality of times, the developing solution around the entire surface of the plate is replaced with a new developing solution a plurality of times at predetermined time intervals, and the coating film thickness of the developing solution and the substitution frequencies of the treatment liquid, for controlling the progress of development, the development results of Nozomu Tokoro is obtained.
[0014]
In the present invention, preferably, the film thickness of the developing solution is set at the predetermined time interval so that the solubility of the plate surface by the developing solution reaches saturation. Thereby, development can be performed with less application of the developing solution, and the scattering of the developing solution can be prevented.
[0016]
Furthermore, in the present invention, preferably, after applying the plate surface forming material of the plate cylinder, the developing solution is applied to the plate surface formed by writing the image on the plate surface forming material. . As a result, the plate reproducing apparatus can be mounted on the printing press in a small size.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in the order of a plate surface developing method, a plate-reproducing printing machine to which the plate surface developing method is applied, and other embodiments. In the respective drawings, the same parts are denoted by the same reference numerals. It should be noted that these drawings and description are merely examples of the present invention, and do not limit the scope of the present invention. It goes without saying that other embodiments can also be included in the scope of the present invention as long as they conform to the gist of the present invention.
[0018]
[Plate surface development method]
FIG. 1 is an explanatory diagram of an embodiment of the plate surface developing method of the present invention, FIG. 2 is an explanatory diagram of a plate reproducing process for the plate surface developing method of FIG. 1, and FIG. 3 is a diagram of the plate surface developing method of FIG. FIG. 4 is a configuration diagram of a plate surface developing apparatus to which the plate surface developing method of FIG. 1 is applied.
[0019]
First, before explaining the plate surface developing method of FIG. 1, a plate making method (plate reproducing method) on a printing press to which the plate surface developing method is applied will be described with reference to FIG. As shown in FIGS. 2 (A) to 2 (E), this on-press plate making method includes an “image wire application / drying step” (FIG. 2 (A)) and an “image writing step” (FIG. 2 (B)). )), A “development step” (FIG. 2 (C)), a “printing step” (FIG. 2 (D)), and a “cleaning / regeneration step” (FIG. 2 (E)).
[0020]
As shown in FIG. 2A, a printing plate (plate) P includes a substrate 1 and an image forming material (photosensitive plate layer) formed on the surface of the substrate 1 (plate surface, plate surface). ) 2). In the specification of the present application, the plate surface or the plate surface can be constituted by various elements of only the surface of the substrate 1 and only the photosensitive plate layer 2, as will be apparent from the following description. The strategic structure should be determined on a case-by-case basis. Similarly, the term "plate" may or may not include the photosensitive printing plate layer 2, so the specific configuration should be determined according to the case.
[0021]
The substrate 1 is made of a grained metal such as aluminum or stainless steel, a polymer film, or the like. However, the material of the substrate 1 is not limited to these metals such as aluminum and stainless steel, or polymer films. An intermediate layer (not shown) (hydrophilic layer described later) is formed on the surface of the substrate 1. As the intermediate layer, for example, a silicone-based compound such as silica (SiO2), silicone resin, or silicone rubber is used as its material. This intermediate layer is formed for imparting hydrophilicity to the base material 1, for ensuring adhesion to the photosensitive printing plate layer 2 described later, and for improving adhesion. is there.
[0022]
As the photosensitive plate material layer 2, various photopolymerizable compositions can be used. For example, one or multiple layers of the hydrophobic photosensitive resin disclosed in JP-A-1-15259 can be applied. In particular, the following photopolymerizable composition proposed by the present applicant is a preferred example.
[0023]
(1) A photopolymerizable composition containing an ethylenic monomer and a photopolymerization initiation system, wherein as an ethylenic monomer, four or more urethane bonds and four or more additions are made in one molecule. A photopolymerizable composition containing a urethane compound having a polymerizable double bond (Japanese Patent Application No. 2001-016536).
[0024]
(2) 800-containing an ethylenic compound, a cyanine sensitizing dye cation and / or a phthalocyanine sensitizing dye having a structure in which a plurality of rings are bonded via a polymethylene chain, an organic boron anion and / or a halomethyl group-containing compound. 1300 nm near-infrared laser exposure photopolymerizable composition (Japanese Patent Application No. 2000-362422).
[0025]
(3) A photopolymerizable composition containing an ethylenically unsaturated compound and a photopolymerization initiation system, wherein the photopolymerization initiation system is a hexaarylbiimidazole compound or a titanocene compound and a dialkylaminobenzene compound. , 400-420 nm photopolymerizable composition for blue-violet laser exposure (Japanese Patent Application No. 2000-364310).
[0026]
First, as shown in FIG. 2 (A), the above-described hydrophobic printing material (polymer) is applied to a substrate 1 and dried to form a photosensitive plate layer 2 on the substrate 1. The photosensitive printing plate layer 2 is formed by dissolving or dispersing a photosensitive printing plate that acts as a hydrophobizing agent when reacted or fixed on the surface of the substrate 1 in a liquid such as water or an organic solvent (photosensitive). The coating solution is applied on the surface of the substrate 1 and dried.
[0027]
This photosensitive printing plate liquid is adjusted to be aqueous or oily, if necessary, depending on the type of the photosensitive printing plate. In the present invention, the “water-based” criterion is that the content of the organic solvent in the liquid at the stage of application is 30% by weight or less, and the “oil-based” criterion is that Has an organic solvent content of more than 30% by weight.
[0028]
Further, apart from such a distinction, an organic solvent having a hydrophilic polar group such as various alcohols can be contained. As the organic solvent to be used, any solvent can be used as long as the photosensitive printing plate can be dissolved, emulsified, or dispersed. From the viewpoint of handleability and cost, a paraffinic or isoparaffinic solvent is suitable, but is not limited thereto. Not something.
[0029]
Next, as shown in FIG. 2B, an image is written on the photosensitive printing plate layer 2 using a laser or the like. Further, as shown in FIG. 2C, the photosensitive plate layer 2 is developed with a developing solution. Thereby, the light irradiation part 2-1 of the photosensitive printing plate layer 2 is dissolved, and the hydrophilic surface of the substrate 1 is exposed. In the non-light-irradiated portion 2-2, the photosensitive printing plate layer 2 remains and remains hydrophobic.
[0030]
Here, the hydrophilic surface is a surface having a contact angle of water of 10 ° or less, and the hydrophobic surface is a hydrophobic portion having a contact angle of water of 50 ° or more, preferably 80 ° or more. The hydrophobic ink for the application easily adheres, while the adhesion of the fountain solution is difficult.
[0031]
After the above processing is completed, as shown in FIG. 2 (D), the surface of the photosensitive printing plate layer 2 is coated with a printing ink 3 and a fountain solution 4 in a mixed state. Then, the hydrophobic ink 3 adheres to the hydrophobic portion 2-2 of the photosensitive printing plate layer 2, and the dampening solution 4 adheres preferentially to the remaining hydrophilic portion 2-1. The ink 3 is repelled and does not adhere. By forming an image in this manner, the surface of the photosensitive printing plate layer 2 has a function as a printing plate. Thereafter, a normal printing process is executed, and the process is terminated. That is, the image is transferred to the bracket cylinder, transferred to paper, and printed.
[0032]
Next, a method of reproducing the printing plate P will be described. As shown in FIG. 2 (E), first, as an ink removing step, ink, dampening water, paper powder, etc. attached to the surface of the photosensitive printing material layer 2 after printing is wiped off. Next, a stripping solution is supplied, the photosensitive plate agent layer 2 is decomposed and removed, and washed with a plate cleaner solution. Thereby, the photosensitive printing plate layer 2 is peeled from the substrate 1. Thus, the reproduction ends.
[0033]
Next, an embodiment of the plate surface developing method of the present invention will be described with reference to FIG. 1A to 1F, the exposed portion of the photosensitive plate layer 2 on the substrate 1 after the image writing shown in FIG. 2B is “2-3”, and the non-exposed portion is “2-3”. -2 ".
[0034]
As shown in FIG. 1A, a predetermined amount of a developing solution 5 is applied to the photosensitive agent plate layer 2. Thereby, as shown in FIG. 1B, the exposed portion 2-3 of the photosensitive printing plate layer 2 is dissolved from the surface. As shown in FIG. 1C, when the dissolution of the developing solution 5 reaches saturation, a predetermined amount of the developing solution 5 is applied to the photosensitive agent plate layer 2 again, and the exposed portion 2 is dissolved. Replace with -4. Thereby, as shown in FIG. 1D, the exposed portion 2-3 of the photosensitive printing plate layer 2 is further dissolved.
[0035]
As shown in FIG. 1 (E), when the dissolution of the developing solution 5 reaches saturation, a predetermined amount of the developing solution 5 is again applied to the photosensitive agent plate layer 2 to dissolve the exposed portion 2. Replace with -4. By repeating this, the exposed portion 2-3 is dissolved, and the hydrophilic surface 2-1 of the base material 1 is exposed, as shown in FIG.
[0036]
FIG. 3 shows this operation in terms of the progress of development and the time. A predetermined amount of the developing agent 5 is applied to dissolve the photosensitive agent plate layer 2, and the predetermined amount of the developing agent When the dissolution at 5 reaches saturation, a predetermined amount of the developing agent 5 is newly applied, and the developing agent 5 in the photosensitive plate layer 2 is replaced. The degree of development can be controlled by the number of times of the substitution and the film thickness (amount) of the developing agent 5.
[0037]
Since this developing solution is applied, it is not necessary to provide a developing container containing a large amount of the developing solution at the lowermost portion of the plate cylinder 11. That is, development is possible not only at the lowermost portion of the plate cylinder 11 but also at any position on the plate cylinder 11. For this reason, a printing machine or the like having a plate cylinder can be made compact. In addition, since an appropriate amount of the developing agent is applied, scattering of the developing agent can be prevented. Further, since the developing agent is replaced to control the progress of development, a desired development result can be obtained in this manner.
[0038]
FIG. 4 shows a configuration example of a developing device to which this developing method is applied. In FIG. 4, a photosensitive plate layer (plate surface) 2 is formed on the surface of a plate cylinder 11. The developing device 13 includes an elastic (developing) roller 13-1 and a film thickness regulating member 13-2. A pool C of the developing solution dropped from the developing solution dropping pipe 49 is formed between the elastic roller 13-1 and the film thickness regulating member 13-2.
[0039]
The developing solution in the pool C forms the developing solution 5 having a constant film thickness on the elastic roller 13-1 by the film thickness regulating member 13-2. Due to the rotation of the elastic roller 13-1, the developer processing liquid 5 having a constant film thickness formed by the film thickness regulating member 13-2 is transported to the photosensitive plate material layer 2 of the plate cylinder 11, and the photosensitive plate material layer The replacement of the developing solution 5 is performed. For this reason, by the rotation of the plate cylinder 11 a plurality of times, the replacement of the developing solution around the photosensitive plate material layer 2 is performed a plurality of times, and the development proceeds.
[0040]
As described above, the degree of freedom in the arrangement of the developing device 13 can be given, the size of the device having the plate cylinder 11 can be reduced, and the size of the developing device 13 itself can be reduced. Also in this case, since the pool of the developing solution is small, scattering of the developing solution can be prevented.
[0041]
[Reproduced printing press to which the plate surface development method is applied]
Next, a plate-reproducing printing machine to which the plate surface developing method is applied will be described with reference to FIGS. FIG. 5 is a configuration diagram of a plate reproduction type printing press to which the plate surface development method of the present invention is applied, FIG. 6 is a partial detailed view thereof, and FIG. 7 is an explanatory diagram of an operation sequence of the plate reproduction type printing press.
[0042]
In FIG. 5, a printing machine 10 includes a plate cylinder 11 around which a printing plate (plate surface) P is wound, a dampening solution supply unit 18 that supplies dampening solution 4 to the plate cylinder 11, and a hydrophobic An ink roller 17 that supplies the ink 3, a bracket cylinder (rubber cylinder) 20 onto which the ink image of the plate cylinder 11 is transferred, and an impression cylinder 21 that conveys the paper 22 with the bracket cylinder 20 interposed therebetween.
[0043]
With this configuration, the ink 3 and the fountain solution 4 are supplied to the printing plate P wound around the rotating plate cylinder 11 to form an ink image, which is transferred to the rotating bracket cylinder 20 and pressed. The image is transferred to a sheet 22 sandwiched between the cylinders 21 and printing is performed.
[0044]
In the on-press plate making apparatus, a plate reproducing module (device) 19 is provided around the plate cylinder 11. The plate reproduction module 19 can be moved in the direction of arrow A in the figure, and can be retracted from the plate cylinder 11 at the time of plate exchange or maintenance of the printing press and the plate reproduction module.
[0045]
The plate reproducing module 19 includes a hydrophobizing agent (polymer) coating device 14, an aqueous solution coating device 13 also serving as a developing device, a plate surface cleaning device 15, an image writing device 16, and a non-contact temperature sensor 36. . A drying device 12 is provided for the plate reproduction module 19 with the plate cylinder 11 interposed therebetween.
[0046]
The hydrophobizing agent (polymer) coating device 14, the aqueous solution coating device 13, the plate surface cleaning device 15, and the image writing device 16 are provided with actuators 30, 31, 32, and 33, respectively. You can evacuate. These actuators 30 to 33 are configured by, for example, air cylinders, and are controlled by the control unit 35.
[0047]
The printing plate P is wound around the plate cylinder 11 and installed. The plate surface cleaning (cleaning) device 15 has a built-in gumming device and removes ink, fountain solution, paper powder and the like from the plate surface after printing. The aqueous solution coating device 13 applies a developing solution to the plate surface of the plate P and develops the photosensitive printing material layer 2 of the plate P. It has a peeling function of decomposing and removing the printing plate layer 2.
[0048]
The hydrophobizing agent applying device 14 is for applying a photosensitive printing plate solution (referred to as a polymer) for forming the photosensitive printing plate layer 2 to the substrate 1 of the printing plate P. The drying device 12 is for drying the printing plate P. The drying device 12 dries the photosensitive printing plate solution applied on the base material 1 and blows the organic solvent or the like to easily form the photosensitive printing plate layer 2. It is formed. The image portion writing device 16 irradiates light (such as infrared rays) to the surface of the photosensitive plate material layer 2 of the plate P to form an image portion. For example, it is composed of a laser exposure device.
[0049]
The arrangement of these devices will be described. The hydrophobizing agent applying device 14 is provided at a position as high as possible above the plate cylinder 11. That is, it is provided on the upstream side in the rotation direction of the plate cylinder 11. The hydrophobizing agent, that is, the polymer, forms the photosensitive printing plate layer 2 which affects the performance of the printing plate. Therefore, it is necessary to avoid the contamination with impurities as much as possible and to apply the coating with the highest precision. Since only the photosensitive plate layer 2 is formed, the amount of the solvent used is small, and liquid leakage and scattering are small. Therefore, the cleaning device 15 and the aqueous solution application device 13 are disposed above the cleaning device 15 and the aqueous solution application device 13, respectively.
[0050]
Next, the aqueous solution coating device 13 uses a large amount of the aqueous solution in order to use the plate surface treatment liquid for development and peeling. Therefore, the amount of liquid leakage and the amount of splash are relatively large. In order to prevent the influence on other devices due to this, it is provided at a position as low as possible of the plate cylinder 11, that is, at the most downstream side in the rotation direction of the plate cylinder 11.
[0051]
The image portion writing device 16 is provided above the cleaning device 15 and the aqueous solution coating device 13 in order to prevent the processing liquid from contaminating the optical system and adversely affecting electric precision parts. Further, by making the plate horizontal, the processing accuracy and the mounting accuracy of the parts can be improved. Paradoxically, it is easy to check the mounting accuracy. Further, in this embodiment, since the writing device 16 can be retracted by itself, it is possible to avoid contamination due to liquid leakage and scattering of solvent and ink from the plate cylinder 11.
[0052]
The plate surface cleaning device 15 is provided below the polymer coating device 14 and the writing device 16 due to the fear of scattering and leakage of the cleaning liquid. In this embodiment, since the solvent is not used, the entire device can be easily moved. Therefore, the writing device 16 is configured to be replaced, and the space is reduced.
[0053]
The drying device 12 generates a large amount of heat, and is disposed at a position as far as possible from the writing device 16 in order to prevent the influence of heat on other devices (particularly, the laser writing device 16). In this embodiment, since there is an empty space below the dampening solution supply device 18, it is located far from the writing device 16 and in the empty space.
[0054]
The plate surface temperature sensor 36 detects the plate surface temperature in order to adjust the development time (plate rotation number, time) in the development process, and is installed near the aqueous solution coating device 13 to improve the temperature measurement accuracy.
[0055]
With this arrangement, it is possible to avoid contamination of the photosensitive printing material layer 2 formed on the base material 1 of the printing drum 11 with impurities, and furthermore, it is possible to make the device compact. For this reason, even if it is installed in an existing printing press, the size of the printing press can be prevented from increasing. Further, since the aqueous solution application device 13 that uses a large amount of the solution is provided at the lower portion, the writing device and the cleaning device can be prevented from being stained.
[0056]
Next, the detailed configuration of these devices 12 to 16 will be described with reference to FIG. In FIG. 6, the same components as those shown in FIG. 5 are indicated by the same symbols. As shown in FIG. 6, the polymer coating device 14 includes a coating roller 14-1 that rotates in a direction (counterclockwise) opposite to the rotation (clockwise) direction of the plate cylinder 11, and a wire bar 14-2.
[0057]
The polymer liquid supply / recovery device 40 drops the polymer liquid between the coating roller 14-1 and the wire bar 14-2, collects the polymer liquid from the coating device 14, and reuses the same. Since the polymer liquid that has passed between the application roller 14-1 and the wire bar 14-2 is applied to the base material 1 of the plate cylinder 11 by the application roller 14-1, the photosensitive plate agent layer 2 having a uniform thickness is formed. Can be formed.
[0058]
The cleaning device 15 has a dropping pipe 44 connected to a plate cleaner liquid supply device 41 and an ink cleaning liquid supply device 42 via a switching valve 43. The main body of the cleaning device 15 has a felt 15-1 for cleaning at its tip, receives the dripping liquid from the drip pipe 44 on the felt 15-1, and cleans the plate cylinder 11. The main body of the cleaning device 15 is movable as shown in the figure.
[0059]
The aqueous solution application device 13 includes an application roller (elastic roller) 13-1 that rotates in a direction (counterclockwise) opposite to the rotation (clockwise) direction of the plate cylinder 11, a layer thickness regulating roller (layer thickness regulating member) 13-2, Having. The developer supply device 45, the development stop solution supply device 46, and the stripping solution supply device 47 are connected via a switching valve 50 to a drip tube provided above the rollers 13-1 and 13-2 of the aqueous solution application device 13. 49, a developer, a development stop solution (for example, water), and a stripper are supplied.
[0060]
The waste liquid tank 48 collects the waste liquid from the aqueous solution application device 13. The processing liquid (developer, development stop liquid, and stripping liquid) that has passed between the application roller 13-1 and the layer thickness regulating roller 13-2 is applied to the substrate 1 of the plate cylinder 11 by the application roller 13-1. Therefore, even if a large amount of aqueous solution is used, liquid leakage and liquid scattering can be minimized.
[0061]
In addition, since the aqueous solution coating device 13 also serves as a developing device and a peeling device, the photosensitive printing agent layer 2 can be developed and peeled with a compact configuration, and the plate making device on a printing press can be easily introduced.
[0062]
The drying device 12 includes an air purge device 12-2 for blowing air to the plate cylinder 11 and a hot air blower 12-1 for blowing hot air to the plate cylinder 11. The air purge device 12-2 removes foreign matter from the plate cylinder 11.
[0063]
Next, an operation sequence of the printing press will be described with reference to FIG.
[0064]
(1) Plate Reproduction Device Evacuation Step The plate reproduction module 19 is manually retracted from the plate cylinder 11 to give space to the plate cylinder 11. Thereby, a space for replacing the plate (substrate) 1 can be secured. Similarly, a maintenance space for the printing press and the reproducing apparatus can be secured. That is, since each device of the plate reproducing apparatus is integrally formed as a plate reproducing module, by exchanging the module, the replacement of the base material and the maintenance of the device can be easily performed.
[0065]
(2) The substrate exchange plate cylinder 11 is rotated once, the old substrate 1 is taken out, and the new substrate 1 is attached.
[0066]
(3) Plate Reproduction Device Return The plate reproduction module 19 is returned to the operating position. Thereby, operation becomes possible.
[0067]
(4) Drawing Material Application Step As shown by arrow B in FIG. 5, the bracket cylinder 20 is separated from the plate cylinder 11 by an eccentric mechanism, and the application roller 14-1 of the polymer coating device 14 is moved by the actuator 30 to the plate cylinder 11. It is brought into contact with the substrate 1. Next, the application roller 14-1 and the plate cylinder 11 are rotated while supplying the polymer liquid from the polymer liquid supply / recovery device 40 to the application roller 14-1. The polymer liquid is applied to the substrate 1 attached to the plate cylinder 11 by one rotation of the plate cylinder 11.
[0068]
(5) Drying process The application roller 14-1 in FIG. 5 is retracted, the drying device 12 is operated, the plate cylinder 11 is rotated, and the polymer liquid applied to the base material 1 of the plate cylinder 11 is dried. A photosensitive plate layer 2 is formed on a material 1. A plurality of rotations of the plate cylinder 11 are performed to fix the photosensitive plate layer 2 on the substrate 1.
[0069]
(6) Image Writing Step As shown in FIG. 5, the actuator 31 moves the image writing device 16 to a writing position (a position where the laser beam of the writing device 16 is focused on the photosensitive plate layer 2 of the substrate 1). While moving and rotating the plate cylinder 11, the photosensitive plate material layer 2 of the plate cylinder 11 is irradiated with a laser beam according to image data, and the image is spirally exposed to write an image.
[0070]
(7) Development Step As shown in FIG. 5, the application roller 13-1 of the water-soluble application device 13 is brought into contact with the photosensitive plate material layer 2 of the plate cylinder 11 by the actuator 33. Next, the application roller 13-1 and the plate cylinder 11 are rotated while a developer (development processing solution) is supplied from the developer supply device 45 to the application roller 13-1. Thereby, the application roller 13-1 applies the developing solution to the photosensitive plate material layer 2 of the plate cylinder 11 and performs development. At this time, it is desirable that the writing device 16 be retracted in order to avoid contamination by the developing solution.
[0071]
The control unit 50 detects the plate surface detection temperature of the temperature sensor 36, monitors the progress of development, and controls the rotation speed of the plate cylinder 11. When the controller 50 determines from the plate surface detection temperature that the development has been completed (the image portion and the non-image portion have been formed), the supply of the developer (development processing solution) from the developer supply device 45 is stopped.
[0072]
Next, the application roller 13-1 and the plate cylinder 11 are rotated while supplying the development stop liquid (fixing liquid, for example, water) to the application roller 13-1 from the development stop liquid supply device 46, and the application roller 13-1 is rotated. As a result, the development stop solution is applied to the photosensitive plate material layer 2 of the plate cylinder 11. Thereby, fixing is performed. Further, the developing solution of the photosensitive plate material layer 2 of the plate cylinder 11 is removed by the air purge device 12-2.
[0073]
(8) Printing Process As shown in FIG. 5, in the printing process, the application roller 13-1 of the aqueous solution application device 13 is retracted from the plate cylinder 11 by the actuator 33, and the inking roller 17, the dampening solution supply device 18 and The blanket cylinder 20 is brought into contact with the plate cylinder 11. Then, the paper 22 is transported by the impression cylinder 21 so as to be in contact with the blanket cylinder 19 and in the direction of arrow D. By doing so, the ink image formed on the printing plate P of the plate cylinder 11 is transferred to the paper 22 via the bracket cylinder 20, and continuous printing is performed.
[0074]
(9) Washing Step Washing for the reproduction of the printing plate having been printed as described above is performed as follows. First, the plate cleaning device 15 is brought into contact with the plate cylinder 11 by the actuator 32, and the ink cleaning liquid is supplied from the ink cleaning liquid supply device 42 to the dropping tube 44. Thus, the ink cleaning liquid is dropped on the felt 15-1 of the cleaning device 15, and the ink, dampening water, paper powder, and the like adhering to the surface of the photosensitive printing material layer 2 of the plate cylinder 11 are wiped off.
[0075]
Thereafter, the cleaning device 15 is detached from the plate cylinder 11, and the application roller 13-1 of the water-soluble coating device 13 is brought into contact with the photosensitive plate layer 2 of the plate cylinder 11. Next, the stripping solution is supplied from the stripping solution supply device 47 to the dropping tube 49, and the stripping solution is applied to the photosensitive plate material layer 2 of the plate cylinder 11 by the application roller 13-1. Thereby, the photosensitive printing material layer 2 is decomposed, collected by the application roller 13-1, and the photosensitive printing material layer 2 is peeled off.
[0076]
(10) Regeneration Step With the plate cleaning device 15 in contact with the plate cylinder 11, the plate cleaner liquid is supplied from the plate cleaner liquid (hydrophilic treatment liquid) supply device 41 to the drip pipe 44. As a result, the plate cleaner is dropped on the felt 15-1 of the cleaning device 15, the plate cleaner is applied to the substrate 1 of the plate cylinder 11, and the substrate 1 is subjected to a hydrophilic treatment.
[0077]
Next, the fixing stop liquid (water) is supplied from the fixing stop liquid supply device 46 to the dropping tube 49, and the fixing stop liquid (water) is supplied to the base material 1 of the plate cylinder 11 by the application roller 13-1. The hydrophilizing solution is removed. The base material 1 is washed with water, and the application of the image forming material of (4) becomes possible.
[0078]
[Other embodiments]
In the above embodiment, the negative type developing method has been described, but a positive type developing method can also be applied.
[0079]
In addition, although the description has been given of the plate-reproducing printing machine that performs application, writing, development, washing, and regenerating a photosensitive plate agent on a printing machine, the present invention can also be applied to a plate-making printing machine that does not perform coating, washing, and regenerating. In addition, the present invention can be applied to a plate-making type printing machine that performs only development.
[0080]
Although the application mechanism of the developing solution has been described as an elastic roller such as a rubber roller, other application mechanisms such as a sponge roller and an application brush can be used.
[0081]
Furthermore, in the above-described embodiment, the description has been made of the water-soluble coating device which also serves as the developing device and the peeling device. However, the developing device and the peeling device may be provided separately.
[0082]
【The invention's effect】
As described above, since an appropriate amount of the developing agent is applied, scattering of the developing agent can be prevented. Further, since the developing agent is replaced and the progress of development is controlled by rotating the plate cylinder a plurality of times, a desired development result can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a plate surface developing method of the present invention.
FIG. 2 is an explanatory diagram of a plate reproduction type printing method using the plate surface development method of FIG. 1;
FIG. 3 is an operation explanatory view of the plate surface developing method of FIG. 1;
FIG. 4 is a configuration diagram of a plate surface developing apparatus to which the plate surface developing method of FIG. 1 is applied.
FIG. 5 is a configuration diagram of a plate reproduction type printing press to which the plate surface development method of FIG. 1 is applied.
FIG. 6 is a partial detailed view of the plate reproduction type printing press of FIG. 5;
FIG. 7 is an explanatory diagram of an operation sequence of the plate reproduction type printing press of FIG. 5;
FIG. 8 is an explanatory diagram of a conventional plate surface developing method.
[Explanation of symbols]
1 base material 2 photosensitive plate layer (hydrophobizing plate layer)
2-1 Hydrophilized surface 2-2 Hydrophobized part 2-3 Image exposure part 2-4 Dissolving part 3 Hydrophobic ink 4 Dampening solution 5 Developing solution 10 Printing machine 11 Plate cylinder 12 Drying device 13 Plate surface developing device (aqueous solution) Coating device)
14 Hydrophobizing solution coating device 15 Plate surface cleaning device 16 Writing device 17 Ink supply roller 18 Dampening solution supply device 19 Plate reproduction module 20 Bracket cylinder 21 Impression cylinder 22 Paper (medium)
30-33 Actuator 35 Controller 36 Non-contact temperature sensor

Claims (3)

A plate cylinder, with respect to the rotation of the plate cylinder, in the development processing liquid coating device and the provided printing press in a fixed position, in accordance with the image, so as to have characteristics different properties with respect to developing solution, the plate cylinder to the plate surface that has been prepared, by the action of development processing solution, a printing plate developing method for developing the plate surface,
The pre Kigen image treatment liquid application device, said plate cylinder to rotate, the developing solution film thickness is controlled, was applied at predetermined time intervals on the plate surface, by utilizing a plurality of revolutions of the plate cylinder Replacing the developing solution around the plate surface with a new developing solution a plurality of times at predetermined time intervals,
A plate surface developing method, wherein the progress of the development is controlled by a coating film thickness of the developing solution and a replacement frequency of the developing solution. 2. The plate surface developing method according to claim 1, wherein the film thickness of the developing solution is set at the predetermined time interval so that the solubility of the plate surface by the developing solution reaches saturation. The method according to claim 1, wherein after applying the plate forming material on the plate cylinder, the developing solution is applied to the plate surface formed by writing the image on the plate forming material. Kano plate development method.

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