A variable digital printing plate unit and a manufacturing method thereof

Abstract

The present invention provides a variable digital printing plate unit, which is characterized by comprising: a printing plate, provided with a plurality of through holes for ink circulation; a plurality of spherical particles for filling the through holes. Among them, the through holes have a certain taper, and the axial section of the through holes is trapezoidal. The plurality of spherical particles all carry charges of the same polarity. The through holes filled with spherical particles on the printing plate correspond to the blank areas to be printed, and the through holes not filled with spherical particles correspond to the graphics and texts to be printed. The present invention also provides a manufacturing method for the variable digital printing plate unit, which enables the manufacturing process of the variable digital printing plate unit to dispense with the developing and rinsing processes, reduces the treatment of waste water, and lowers the production cost. Therefore, the variable digital printing plate unit and its manufacturing method provided by the present invention have the characteristics of simple structure, simple method, low manufacturing cost, and environmental friendliness.

Description

Technical Field

[0001] The present invention relates to the field of printing plates, and particularly to a variable digital printing plate unit and a manufacturing method thereof. Background Art

[0002] In the production process of the existing printing plates, processing procedures such as exposing, developing, and rinsing the film and the plate material are required. These processing procedures need to use a large amount of chemical solutions, making the wastewater generated in the printing plate production process contain a large amount of harmful substances. Therefore, in the existing technology, a complex purification treatment of the wastewater needs to be added during the production process of the printing plate, and the wastewater can only be discharged after reaching the corresponding discharge standards, increasing the cost of printing plate manufacturing. And the printing plates in the existing technology can only print specific graphic information. When other graphic information needs to be printed, another printing plate needs to be re-made, further increasing the production cost.

[0003] Therefore, the production process of the printing plates in the existing technology is complex, costly, and has a certain impact on the environment. Summary of the Invention

[0004] The present invention is made to solve the above problems, and aims to provide a variable digital printing plate unit and a manufacturing method thereof. For this purpose, the following technical solutions are provided.

[0005] The present invention provides a variable digital printing plate unit, having the following features: including a printing plate provided with a plurality of through holes for ink circulation; a plurality of spherical particles for filling the through holes, wherein the through holes have a certain taper, the axial section of the through holes is trapezoidal, and the plurality of spherical particles all carry charges of the same polarity. The through holes filled with spherical particles on the printing plate correspond to the blank areas to be printed, and the through holes not filled with spherical particles correspond to the graphics and texts to be printed.

[0006] In the variable digital printing plate unit provided by the present invention, it may further have the following features: wherein, the printing plate is of a flat plate structure, and the through holes are opened along the thickness direction of the printing plate; or the printing plate is of a hollow cylindrical structure, and the through holes are opened along the radial direction of the printing plate.

[0007] In the variable digital printing plate unit provided by the present invention, it may further have the following features: wherein, the two ends of the through holes are respectively an ink inlet and an ink outlet, the diameter of the ink inlet is larger than the diameter of the ink outlet, and the diameter of the spherical particles is larger than the diameter of the ink outlet and smaller than the diameter of the ink inlet.

[0008] In the variable digital printing plate unit provided by the present invention, it may further have the following features: wherein, the diameter of the spherical particles is 20 micrometers to 70 micrometers.

[0009] In the variable digital printing plate unit provided by the present invention, it may further have the following features: wherein, the spherical particles carry negative charges.

[0010] In the variable digital printing plate unit provided by the present invention, it may further have the following feature: wherein, the through holes of the printing plate are made by laser engraving.

[0011] In the variable digital printing plate unit provided by the present invention, it may further have the following feature: wherein, the spherical particles are toner particles or metal particles.

[0012] In the variable digital printing plate unit provided by the present invention, it may further have the following feature: wherein, the material of the printing plate is ceramic, aluminum alloy or stainless steel.

[0013] The present invention provides a method for manufacturing a variable digital printing plate unit, which has the following features and includes the following steps: Step S1, laser engrave a flat material for making the printing plate to obtain a printing plate with a plurality of through holes, and the axial section of the through holes is trapezoidal; Step S2, prepare a plurality of spherical particles for filling the through holes, and the plurality of spherical particles are all charged with the same polarity of charge; Step S3, charge the pre-prepared charged spherical balls to obtain charged spherical balls with the opposite charge polarity to that of the spherical particles; Step S4, bring the charged spherical balls close to the spherical particles so that the spherical particles are evenly attached to the surface of the charged spherical balls; Step S5, charge the photoconductive selenium drum so that the photoconductive selenium drum is charged with the opposite charge polarity to that of the spherical particles, and the charge intensity of the photoconductive selenium drum is greater than the charge intensity of the charged spherical balls; Step S6, expose the photoconductive selenium drum according to the graphic and text information to be printed, and the charge at the position corresponding to the graphic area on the photoconductive selenium drum disappears, while the charge at the position corresponding to the non-graphic area on the photoconductive selenium drum still exists; Step S7, bring the charged spherical balls close to the photoconductive selenium drum so that the spherical particles are transferred to the position corresponding to the non-graphic area on the photoconductive selenium drum; Step S8, place the printing plate stably with the lower bottom edge of the trapezoid facing upward, and place a plate with the opposite charge polarity to that of the spherical particles parallel to the lower side of the printing plate, and the charge intensity of the plate is greater than the charge intensity of the photoconductive selenium drum; Step S9, bring the side of the photoconductive selenium drum close to the printing plate and then slowly move it to the other side of the printing plate so that the spherical particles on the photoconductive selenium drum are attracted by the plate into the through holes at the corresponding positions on the printing plate.

[0014] In the method for manufacturing a variable digital printing plate unit provided by the present invention, it may further have the following feature: wherein, the photoconductive selenium drum is cylindrical, and positive charges are distributed on the outer peripheral surface of the photoconductive selenium drum.

[0015] Functions and effects of the invention

[0016] According to the variable digital printing plate unit provided by the present invention, spherical particles are filled into the through holes with a certain taper on the printing plate. The area filled with spherical particles on the printing plate is the non-graphic area of the plate surface, and the area not filled with spherical particles is the graphic area of the plate surface. According to the manufacturing method of the variable digital printing plate unit provided by the present invention, after laser engraving the printing plate, a plurality of through holes are obtained. Under the action of the photoconductive drum and the electrode plate, the spherical particles on the charged spheres are filled into the through holes corresponding to the graphic information to be printed as required. The manufacturing method of the variable digital printing plate unit provided by the present invention reduces the processes of developing and rinsing, eliminates the chemical solutions required for the developing and rinsing processes, and further eliminates the treatment of waste water in the manufacturing process, making the manufacturing process of the variable digital printing plate unit simple, with low cost, and reducing the environmental pollution during the manufacturing process. In addition, the spherical particles can be taken out from one side of the lower bottom edge of the trapezoidal cross-section of the through hole. When changing the graphic information to be printed, only the spherical particles need to be taken out and filled into the through holes corresponding to the new graphic information, and the printing plate can be reused, further reducing the production cost.

[0017] Therefore, the variable digital printing plate unit and its manufacturing method provided by the present invention have the characteristics of simple structure, simple method, low manufacturing cost, and environmental friendliness. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the printing plate with a flat plate structure in the embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the manufacturing method of the variable digital printing plate unit in the embodiment of the present invention; and

[0020] Figure 3 is a flowchart of the manufacturing method of the variable digital printing plate unit in the embodiment of the present invention. Detailed Embodiments

[0021] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following embodiments will specifically describe the variable digital printing plate unit and its manufacturing method of the present invention in conjunction with the drawings.

[0022] <Embodiment>

[0023] The variable digital printing plate unit 100 includes a printing plate 10 and spherical particles 20.

[0024] Figure 1 is a schematic structural diagram of the printing plate with a flat plate structure in the embodiment of the present invention.

[0025] The printing plate 10 is of a flat plate structure or a hollow cylindrical structure. A plurality of through holes 11 are formed in the printing plate 10 by laser engraving, and the plurality of through holes 11 are uniformly arranged. The through holes 11 have a certain taper, and the axial section of the through holes 11 is trapezoidal. The lower bottom edge of the trapezoidal section of the through hole 11 is the ink inlet, and the upper bottom edge of the trapezoidal section is the ink outlet. The diameter of the ink inlet is larger than the diameter of the ink outlet. In this embodiment, the printing plate 10 is of a flat plate structure, and the through holes 11 on the printing plate 10 are formed along the thickness direction, as Figure 1 shown. In practical applications, if a printing plate 10 of a hollow cylindrical structure is selected, the through holes 11 are formed along the radial direction of the printing plate 10. In this embodiment, the material of the printing plate 10 is ceramic. In practical applications, the material of the printing plate 10 can also be selected from metal materials such as aluminum alloy and stainless steel.

[0026] Spherical particles 20 can fill the through holes 11 on the printing plate 10. The area on the printing plate 10 filled with the spherical particles 20 is the non-graphic area of the plate surface, and the area not filled with the spherical particles 20 is the graphic area of the plate surface. The diameter of the spherical particles is larger than the diameter of the ink outlet and smaller than the diameter of the ink inlet. The diameter of the spherical particles is 20 microns to 70 microns. In this embodiment, the diameter of the spherical particles 20 is 50 microns, which is smaller than the length of the lower bottom edge of the trapezoidal section of the through hole 11 and larger than the length of the upper bottom edge of the trapezoidal section of the through hole 11. The spherical particles 20 are toner particles or metal particles. In this embodiment, the spherical particles 20 are toner particles, and the spherical particles 20 carry negative charges.

[0027] Figure 2 is a schematic diagram of a manufacturing method of a variable digital printing plate unit in an embodiment of the present invention.

[0028] Figure 3 is a flowchart of a manufacturing method of a variable digital printing plate unit in an embodiment of the present invention.

[0029] As Figure 2 shown, a variable digital printing plate unit 100 with a printing plate 10 of a flat plate structure is manufactured by a charged sphere 1, a photoconductive selenium drum 2, and a plate electrode 3, including the following steps as Figure 3 shown:

[0030] Step S1, laser engrave a flat plate material for making a printing plate to obtain a printing plate with a plurality of through holes, and the axial section of the through holes is trapezoidal;

[0031] Step S2, prepare a plurality of spherical particles for filling the through holes, and the plurality of spherical particles all carry charges of the same polarity;

[0032] Step S3, charge the pre-prepared charged sphere 1 to obtain a charged sphere 1 with a charge polarity opposite to that of the spherical particles;

[0033] Step S4: Bring the charged sphere 1 close to the spherical particles 20 so that the spherical particles 20 are evenly attached to the surface of the charged sphere 1.

[0034] Step S5: Charge the photoconductive selenium drum so that the photoconductive selenium drum has an opposite charge polarity to that of the spherical particles, and the charge intensity of the photoconductive selenium drum is greater than the charge intensity of the charged sphere.

[0035] Step S6: Expose the photoconductive selenium drum 2 according to the graphic and text information to be printed. The positive charges at the positions corresponding to the graphic areas on the photoconductive selenium drum 2 disappear, while the positive charges at the positions corresponding to the non-graphic areas on the photoconductive selenium drum 2 still exist.

[0036] Step S7: Bring the charged sphere close to the photoconductive selenium drum so that the spherical particles are transferred to the positions corresponding to the non-graphic areas on the photoconductive selenium drum.

[0037] Step S8: Place the printing plate stably with the lower bottom edge of the trapezoid facing up, and place the plate with the opposite charge polarity to that of the spherical particles parallel to the lower side of the printing plate, and the charge intensity of the plate is greater than the charge intensity of the photoconductive selenium drum.

[0038] Step S9: Move the photoconductive selenium drum slowly from one side of the printing plate to the other side after bringing it close to one side of the printing plate, so that the spherical particles on the photoconductive selenium drum are attracted by the plate into the through holes at the corresponding positions on the printing plate.

[0039] In this embodiment, the used photoconductive selenium drum 2 is cylindrical. After charging, the positive charges are evenly distributed on the outer peripheral surface of the photoconductive selenium drum 2. The photoconductive selenium drum 2 rolls around the axis and rolls from one side of the printing plate to the other side, so that the spherical particles 20 are correspondingly attracted by the plate 3 into the through holes 11 of the printing plate 10.

[0040] In this embodiment, the charged sphere 1, the photoconductive selenium drum 2, and the plate 3 are all positively charged.

[0041] During the use of the variable digital printing plate unit 100 prepared by the above steps, the ink flows from the lower bottom edge of the trapezoidal cross-section of the through hole 11 to the upper bottom edge of the trapezoidal cross-section of the through hole 11. There are spherical particles 20 blocking the flow of the ink in the through holes 11 corresponding to the non-graphic areas on the printing plate 10, and there are no spherical particles 20 in the through holes 11 corresponding to the graphic areas on the printing plate 10. The ink flows from the lower bottom edge to the upper bottom edge of the trapezoidal cross-section in the through hole 11 to complete printing.

[0042] When it is necessary to change the graphic and text information that the printing plate 10 can print, by placing the plate 3 above the printing plate 10, the spherical particles 20 are adsorbed onto the plate 3 through one side of the lower bottom edge of the trapezoidal cross-section of the through hole 11, and then repeat steps S2 to S9.

[0043] Functions and effects of the embodiment

[0044] According to the variable digital printing plate unit provided by the present invention, among the multiple through holes with a certain taper on the printing plate, the axial section of the through hole is trapezoidal. The diameter of the spherical particles is smaller than the length of the lower base of the trapezoidal section of the through hole and larger than the length of the upper base of the trapezoidal section of the through hole, so that the spherical particles can fill the through holes. The area filled with spherical particles on the printing plate is the non-graphic area of the plate surface, and the area not filled with spherical particles is the graphic area of the plate surface. According to the manufacturing method of the variable digital printing plate unit provided by the present invention, after laser engraving the printing plate to obtain multiple through holes, under the action of the photoconductive drum and the electrode plate, the spherical particles on the charged spheres are filled into the through holes corresponding to the graphic information to be printed as required. The manufacturing method of the variable digital printing plate unit provided by the present invention reduces the processes of developing and rinsing, eliminates the chemical solutions required for the developing and rinsing processes, and further eliminates the purification treatment of wastewater during the manufacturing process, making the manufacturing process of the variable digital printing plate unit simpler, with low cost, and reducing the environmental pollution during the manufacturing process. In addition, when it is necessary to change the graphic information that the printing plate can print, only the spherical particles in the through holes need to be taken out, and then the corresponding through holes can be filled with spherical particles according to the new graphic information, further reducing the cost of printing plate manufacturing.

[0045] Therefore, the variable digital printing plate unit and its manufacturing method provided by the present invention have the characteristics of simple structure, simple method, low manufacturing cost, and environmental friendliness.

[0046] The above embodiments are preferred cases of the present invention and are not used to limit the protection scope of the present invention.

Claims

1. A variable digital printing plate unit, characterized in that, Comprising: A printing plate, provided with a plurality of through holes for ink circulation; A plurality of spherical particles, used to fill the through holes, wherein, the through holes have a certain taper, and the axial section of the through holes is trapezoidal, a plurality of the spherical particles are all charged with the same polarity of charge, the through holes filled with the spherical particles on the printing plate correspond to the blank areas to be printed, and the through holes not filled with the spherical particles correspond to the graphics and texts to be printed.

2. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, The printing plate is of a flat plate structure, and the through holes are opened along the thickness direction of the printing plate; or the printing plate is of a hollow cylindrical structure, and the through holes are opened along the radial direction of the printing plate.

3. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, Both ends of the through holes are an ink inlet and an ink outlet respectively, and the diameter of the ink inlet is larger than the diameter of the ink outlet, the diameter of the spherical particles is larger than the diameter of the ink outlet and smaller than the diameter of the ink inlet.

4. The variable digital printing plate unit according to claim 3, characterized in that: Wherein, The diameter of the spherical particles is 20 microns to 70 microns.

5. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, The spherical particles are negatively charged.

6. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, The through holes of the printing plate are made by laser engraving.

7. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, The spherical particles are toner particles or metal particles.

8. The variable digital printing plate unit according to claim 1, characterized in that: Wherein, The material of the printing plate is ceramic, aluminum alloy or stainless steel.

9. A manufacturing method of a variable digital printing plate unit, characterized in that, Including the following steps: Step S1, laser engrave a flat plate material for making the printing plate to obtain a printing plate with a plurality of through holes, and the axial section of the through holes is trapezoidal; Step S2, prepare a plurality of spherical particles for filling the through holes, and a plurality of the spherical particles are all charged with the same polarity of charge; Step S3, charge the pre-prepared charged spherical balls to obtain the charged spherical balls with the opposite charge polarity to that of the spherical particles; Step S4, bring the charged spherical balls close to the spherical particles so that the spherical particles are evenly attached to the surface of the charged spherical balls; Step S5, charge the photoconductive selenium drum so that the photoconductive selenium drum is charged with the opposite charge polarity to that of the spherical particles, and the charge intensity of the photoconductive selenium drum is greater than the charge intensity of the charged spherical balls; Step S6, expose the photoconductive selenium drum according to the graphic and text information to be printed, and the charge at the position corresponding to the graphic area on the photoconductive selenium drum disappears, and the charge at the position corresponding to the non-graphic area on the photoconductive selenium drum still exists; Step S7, bring the charged spherical balls close to the photoconductive selenium drum so that the spherical particles are transferred to the position corresponding to the non-graphic area on the photoconductive selenium drum; Step S8, place the printing plate stably with the lower bottom edge of the trapezoid facing upwards, and place a plate with the opposite charge polarity to that of the spherical particles parallel to the lower part of the printing plate, and the charge intensity of the plate is greater than the charge intensity of the photoconductive selenium drum; Step S9, bring the side of the photoconductive selenium drum close to the printing plate and then slowly move it to the other side of the printing plate so that the spherical particles on the photoconductive selenium drum are attracted by the plate into the through holes at the corresponding positions on the printing plate.

10. The manufacturing method of the variable digital printing plate unit according to claim 9, characterized in that: wherein, The photoconductive selenium drum is cylindrical, and positive charges are distributed on the outer peripheral surface of the photoconductive selenium drum.

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