WO2017187626A1 - 印刷用ブランケット、印刷用ブランケットの製造方法及び印刷用ブランケットを使用した印刷方法 - Google Patents
印刷用ブランケット、印刷用ブランケットの製造方法及び印刷用ブランケットを使用した印刷方法 Download PDFInfo
- Publication number
- WO2017187626A1 WO2017187626A1 PCT/JP2016/063458 JP2016063458W WO2017187626A1 WO 2017187626 A1 WO2017187626 A1 WO 2017187626A1 JP 2016063458 W JP2016063458 W JP 2016063458W WO 2017187626 A1 WO2017187626 A1 WO 2017187626A1
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- WO
- WIPO (PCT)
- Prior art keywords
- printing
- blanket
- elastic body
- printing surface
- ink
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
- B41F17/30—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces of essentially spherical, or part-spherical, articles
- B41F17/34—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces of essentially spherical, or part-spherical, articles on articles with surface irregularities, e.g. fruits, nuts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
- B41F17/001—Pad printing apparatus or machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
- B41F17/006—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
- B41F17/28—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces of conical or frusto-conical articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/40—Printing on bodies of particular shapes, e.g. golf balls, candles, wine corks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
- B41N10/02—Blanket structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
- B41N10/02—Blanket structure
- B41N10/04—Blanket structure multi-layer
Definitions
- the present invention relates to a blanket for printing used for blanket printing in which ink transferred from a printing original plate is transferred to a printing surface.
- a printing surface of a printing blanket is pressed against a printing original plate, and ink arranged according to a printing pattern on the printing original plate is transferred to the printing blanket. Thereafter, the printing surface of the printing blanket to which the ink has been transferred is pressed against the surface to be printed, and the transferred ink is transferred to the surface to be printed, thereby printing a printing pattern on the surface to be printed.
- the printing blanket is an elastic body such as silicon rubber mixed with silicon oil having elasticity (flexibility), and has a substantially hemispherical shape, a bullet shape, or a substantially semi-cylindrical shape having a bullet-like cross section. Is formed. Then, the printing surface of the elastic body is pressed against the flat printing original plate, and after the ink is transferred from the printing original plate to the printing surface, the printing surface is pressed against the surface to be printed having a curved shape or unevenness from the printing surface. Ink is transferred to the surface to be printed.
- an elastic body such as silicon rubber mixed with silicon oil having elasticity (flexibility)
- the printing surface of the elastic body is pressed against the flat printing original plate, and after the ink is transferred from the printing original plate to the printing surface, the printing surface is pressed against the surface to be printed having a curved shape or unevenness from the printing surface. Ink is transferred to the surface to be printed.
- each of the “small printing original plates 30a, 30b, 30c, and 30d corresponding to each of the small printing surfaces 1 is Ink is placed along the small developed pattern 3 on the corresponding small print surface 1 (S4 shown in FIG. 1).
- “And small printing blankets 40a, 40b, 40c, 40d (hereinafter sometimes referred to as“ small printing blankets 40 ”) corresponding to the small printing surfaces 1 respectively.
- the ink is pressed against the printing original plate 30 to transfer the ink to each small printing blanket 40 (S5 shown in FIG. 1). Further, the small printing blanket 40 is pressed against the small printing surface 1 corresponding to the small printing blanket 40, and the small pattern 2 is printed thereon (S6 shown in FIG. 1).
- Such a technique is disclosed.
- the present invention has been made in order to solve the above-described problems, and is a printing blanket capable of suppressing a defect in ink transfer from a printing original plate to a printing blanket while maintaining the accuracy of an image to be printed.
- a printing blanket manufacturing method and a printing method using the printing blanket are provided.
- a printing blanket according to the present invention includes an elastic body that deforms following the shape of a printing surface, the elastic body includes a printing surface that is pressed against the printing surface, and the printing surface includes a plurality of printing surfaces.
- the height difference between the highest part and the lowest part of the uneven shape is 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface of the printing blanket can be pressed against the printing original plate while the viscosity of the ink on the printing original plate is increased, and the ink can be transferred to the printing surface. Therefore, the ink can be prevented from being crushed, and the ink can be transferred to the printing surface while maintaining the resolution of the printed image. Thereby, it is possible to print a fine image on a printing surface having a curved surface shape or unevenness.
- Embodiment 1 a printing blanket according to the present invention will be described with reference to the drawings.
- the present invention is not limited to the embodiments described below.
- symbol is attached
- Each drawing is schematically drawn, and the present invention is not limited to the illustrated shape (in particular, the thickness of the sheet is exaggerated).
- the elastic body or elasticity is not limited to a linear relationship between the load applied to the elastic body and the amount of deformation caused by the load, and is a non-linear relationship, When the applied load is removed, it includes one that returns to its original shape immediately or after a predetermined time delay.
- FIG. 1 is a side view showing an example of a printing blanket 10 according to Embodiment 1 of the present invention.
- the printing blanket 10 shown in FIG. 1 is a substantially hemispherical elastic body.
- the substantially hemispherical flat surface portion is used as the bottom surface, the distance from the center of the bottom surface to the vertex 11 is longer than that of a normal hemisphere having a bottom surface of the same size. That is, the printing blanket is shaped like a shell.
- the shape of the printing blanket is not limited to this.
- the shape of a hemisphere, a curved surface formed by rotating a parabola around its axis of symmetry, a part of an ellipsoid cut, a bullet shape or a semicircular shape is straightened.
- the shape can be appropriately changed according to the specifications of the printing surface 18 such as the shape continuously extended on the line.
- a predetermined range around the vertex 11 of the surface of the printing blanket 10 is the printing surface 13 that transfers the ink 17 from the printing original plate and transfers it to the printing surface 18.
- FIG. 2 is a cross-sectional view of the printing blanket 10 of FIG. A cross section passing through the vertex 11 of the printing blanket 10 and perpendicular to the bottom surface is shown.
- the printing blanket 10 includes a base 1 and a sheet 2 attached along the curved surface of the base 1.
- the elastic body constituting the printing blanket 10 is composed of a base 1 and a sheet 2 attached along the curved surface of the base 1.
- the sheet 2 corresponds to the coating layer of the present invention.
- the elastic body is not limited to the two-layer structure of the base 1 and the sheet 2 as shown in FIG. 2, and may be configured by more layers. Further, the elastic body may be composed of only one elastic body instead of a plurality of layers.
- the base 1 is configured by molding, for example, silicon rubber.
- the base body 1 is mixed with silicone oil in order to give elasticity (flexibility) and facilitate deformation.
- the base body 1 has a bullet shape like the printing blanket 10, but the shape can be appropriately changed according to the specifications of the printing surface 18.
- the substrate 1 is deformed when pressed against the printing original plate 16 shown in FIG. 3, and the ink 17 corresponding to the printing pattern applied to the printing original plate 16 can be transferred to the sheet 2.
- the material (substance) is not limited as long as the transferred ink 17 can be transferred to the printing surface 18 when pressed against the printing surface 18 shown in FIG.
- the sheet 2 is made of a sheet-like silicon rubber having a predetermined thickness (for example, 0.5 mm).
- silicon rubber having higher hardness and less silicon oil content than that of the silicon rubber constituting the base 1 is employed.
- the material is not limited to this, and when pressed against the printing original plate 16, the ink 17 corresponding to the printing pattern applied to the printing original plate 16 can be transferred, and when pressed against the printing surface 18, Any ink can be used as long as the transferred ink 17 can be transferred to the printing surface 18. Further, in the step of attaching the sheet 2 to be described later to the substrate 1, it is sufficient that the sheet 2 has sufficient elasticity so that it can be attached along the surface of the substrate 1.
- the sheet 2 is molded by, for example, a mold, and the uneven shape 14 may be formed on the surface by molding. Furthermore, the surface of the sheet 2 may be formed with a concavo-convex shape 14 in which the height difference 15 between the highest portion and the lowest portion of the concavo-convex shape 14 is 2 ⁇ m or more and 20 ⁇ m or less.
- the sheet 2 is affixed to at least a part of the surface of the substrate 1 and becomes the printing surface 13 of the printing blanket 10.
- the sheet 2 is attached to the substrate 1 by using, for example, an adhesive.
- FIG. 3 is an explanatory diagram of printing by the printing blanket 10 according to the first embodiment of the present invention.
- printing by using a bullet-shaped printing blanket 10 will be described as an example.
- the ink 17 is disposed on the printing original plate 16.
- a plurality of inks 17 are arranged to form a predetermined print image.
- the ink 17 is disposed on the printing original plate 16 by, for example, an intaglio plate, a relief plate, or an ink jet.
- the printing blanket 10 is pressed against the printing original plate 16 from the vertex 11 and deformed, and a predetermined area centered on the vertex 11 is pressed against the surface of the printing original plate 16.
- the predetermined area is referred to as a printing surface 13.
- the ink 17 on the printing original plate 16 adheres to the printing surface 13 of the printing blanket 10 and is transferred.
- the base body 1 is easily deformed because it is made of silicon rubber containing a large amount of silicon oil.
- the sheet 2 attached to the surface of the base body 1 is made of, for example, silicon rubber having a hardness higher than that of the base body 1. However, since the sheet 2 is thin, it follows the deformation of the base body 1.
- the material of the sheet 2 is not limited to silicon rubber having a hardness higher than that of the base 1, and the hardness and the material can be appropriately selected as long as they follow the deformation of the base 1.
- the printing surface 13 may be wetted by applying a solvent. By performing this process, the ink 17 is easily transferred to the printing surface 13.
- the printing surface 13 is pressed against the printing surface 18. Then, the ink 17 transferred to the printing surface 13 is transferred from the printing surface 13 to the printing surface 18, and the print image is transferred. Since the printing blanket 10 is configured to be easily deformed, the printing blanket 10 is easy to follow a curved surface to be printed and has good familiarity. Further, since the sheet 2 is formed of silicon rubber having a higher hardness than the base 1, and the amount of silicon oil mixed in the sheet 2 is small, when the printing blanket 10 is deformed, the base 1 is The mixed silicon oil is substantially sealed by the sheet 2 surrounding the silicon oil.
- the printing surface 13 is in a state where silicon oil is appropriately attached, and when the printing surface 13 is pressed against the printing surface 18, the ink 17 hardly remains on the printing surface 13 and is easily transferred to the printing surface 18. .
- corrugated shape 14 is formed in the surface on the opposite side to the side in which the base
- the printing blanket 10 has a printing surface 13 with an uneven shape 14.
- the printed surface 13 has a concavo-convex shape 14 in which the height difference 15 between the highest portion and the lowest portion of the concavo-convex shape 14 is 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface 13 has a three-dimensional surface roughness Sz (maximum height) of 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface 13 is 0.2 ⁇ m or more and 2.0 ⁇ m or less in terms of three-dimensional surface roughness Sa (arithmetic average).
- the uneven shape 14 attached to the printing surface 13 is formed over the entire printing surface 13.
- FIG. 4A to FIG. 4D are diagrams obtained by measuring a part of the concavo-convex shape 14 of the printing surface 13 of the printing blanket 10 according to Embodiment 1 of the present invention.
- FIGS. 4A to 4D show the respective printing surfaces 13 of the printing blanket 10 made so that the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 is different.
- the uneven shape 14 is measured. That is, each of (a) to (q) shown in FIGS. 4A to 4D represents the uneven shape 14 of the printing surface 13 of the different printing blanket 10.
- the uneven shape 14 on the surface of the printing surface 13 is obtained as shown in FIGS. 4A to 4D. Is measured.
- the printing surface 13 is provided with irregular irregular shapes 14.
- a straight line having a reference length of 610 ⁇ m is determined, and the uneven shape 14 is measured along the straight line. According to this measurement, the height difference 15 from the highest part to the lowest part of the concavo-convex shape 14 is 3.7 ⁇ m at the lowest and 16.8 ⁇ m at the highest.
- the printing surface 13 of the printing blanket 10 is almost mirror-finished. Specifically, the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 is 1 ⁇ m or less. .
- the viscosity of the ink 17 was 10 to 100 P (poise). By setting the viscosity of the ink 17 to such a low viscosity, the ink 17 is surely transferred from the printing original plate 16 to the printing surface 13 of the printing blanket 10.
- the ink 17 placed on the printing original plate 16 is arranged such that when the printing original plate 16 is viewed from vertically above, a large number of fine points are collected to form a predetermined image.
- the ink 17 placed on the printing original plate 16 has a predetermined height. Therefore, when the printing surface 13 of the printing blanket 10 is pressed against the printing original plate 16, the ink 17 on the printing original plate 16 is crushed and deformed by the printing surface 13. When the ink 17 has a low viscosity as in the prior art, the ink 17 is crushed.
- the ink 17 arranged as a large number of dots on the printing original plate 16 is transferred to the printing surface 13 of the printing blanket 10, it spreads more than when it is on the printing original plate 16. For this reason, the resolution of the image formed with the ink 17 is lowered.
- the printing surface 13 is provided with the concavo-convex shape 14 in which the height difference 15 between the highest portion and the lowest portion of the concavo-convex shape 14 is 2 ⁇ m or more and 20 ⁇ m or less.
- the viscosity of the ink 17 can be increased.
- the viscosity of the ink 17 can be set to 100 to 1000 P.
- the ink 17 arranged as a large number of points on the printing original plate 16 is difficult to deform and spread.
- the ink 17 can be transferred to the printing surface 13 while suppressing a decrease in the resolution of the image, the resolution of the image printed on the printing surface 18 can also be increased.
- the ink 17 is actually transferred from the printing original plate 16 to the printing blanket 10 by the printing blanket 10 having the concavo-convex shape 14 of (a) to (q) shown in FIG.
- the ink 17 could be transferred from the printing original plate 16 to the printing blanket 10 and was printed well. From this test result, it is more preferable that the printing surface 13 of the printing blanket 10 has a height difference 15 of 5 ⁇ m or more and 15 ⁇ m or less between the highest part and the lowest part of the uneven shape 14. That is, the three-dimensional surface roughness Sz is preferably 5 ⁇ m or more and 15 ⁇ m or less.
- the printing surface 13 has a three-dimensional surface roughness Sa (arithmetic average) of 0.5 ⁇ m or more and 1.2 ⁇ m or less.
- Sa surface roughness
- the base body 1 is formed using, for example, a silicon rubber mold.
- the surface roughness of the substrate 1 is molded without any particular adjustment.
- the surface of the mold for forming the printing surface 13 of the printing blanket 10 is previously processed to a predetermined surface roughness. .
- the concavo-convex shape 14 on the surface of the mold is transferred to the elastic body and molded. This step corresponds to the substrate forming step of the present invention.
- the sheet 2 is also formed by using, for example, a silicon rubber mold.
- the sheet 2 constitutes the surface of an elastic body constituting the printing blanket 10. That is, the sheet 2 constitutes the printing surface 13. Therefore, the surface of the mold for molding at least one surface of the sheet 2 is processed in advance to a predetermined surface roughness. Then, the uneven shape on the surface of the mold is transferred to the sheet 2 and molded.
- the surface of the sheet 2 after molding has a predetermined uneven shape 14.
- the surface of the sheet 2 after molding is molded such that the height difference 15 between the highest part and the lowest part of the uneven shape 14 is 2 ⁇ m or more and 20 ⁇ m or less.
- This step corresponds to the coating layer forming step of the present invention.
- the sheet 2 forming step when the surface of the formed sheet 2 is formed such that the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 is 2 ⁇ m or more and 20 ⁇ m or less, the sheet 2 described later is used as it is. You may proceed to the pasting process. However, even if the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 is in the range of 2 ⁇ m or more and 20 ⁇ m or less, the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 is set to a predetermined value.
- the surface of the sheet 2 is rubbed with an abrasive such as abrasive cloth and the protruding portion of the concavo-convex shape 14, that is, a high portion is shaved in this step.
- an abrasive such as abrasive cloth
- a polishing sponge such as a melamine sponge may be used.
- the surface of the sheet 2 is rubbed with abrasive cloth or the like so that the high portion of the concavo-convex shape 14 is shaved so that the difference 15 is 2 ⁇ m or more and 20 ⁇ m or less.
- the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 can be in the range of 2 ⁇ m or more and 20 ⁇ m or less.
- the sheet 2 forming step when the surface of the formed sheet 2 is formed to have a mirror surface or a roughness close to the mirror surface, in this step, a sheet is used by using an abrasive such as abrasive cloth paper or polishing sponge.
- the surface of 2 may be rubbed to reveal the surface.
- the height difference 15 between the highest part and the lowest part of the concavo-convex shape 14 can be processed in a range of 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface 13 when expressed in terms of three-dimensional surface roughness, can be Sz 2 ⁇ m or more and 20 ⁇ m or less, Sa 0.2 ⁇ m or more and 2.0 ⁇ m or less. This step corresponds to the printing surface finishing step of the present invention.
- the surface of the sheet 2 may be melted or corroded before the above-described finishing step, so that the high portion of the uneven shape 14 can be easily scraped off.
- a solvent such as ethanol is applied to the surface of the sheet 2.
- a solvent that dissolves the material of the sheet 2 may be selected according to the material of the sheet 2 so as to easily scrape off the high portion of the surface uneven shape 14.
- the solvent may be applied to the surface of the sheet 2 and the sheet 2 finishing process may be performed simultaneously.
- the surface of the sheet 2 may be rubbed with a melamine sponge soaked with a solvent. This step corresponds to the surface treatment step of the present invention.
- the surface may be deteriorated or corroded by spraying ozone gas on the surface of the sheet 2, for example.
- the gas to be sprayed may be changed as appropriate according to the material constituting the printing surface 13.
- the sheet 2 is attached to the substrate 1.
- the sheet 2 and the substrate 1 are bonded with, for example, an adhesive. Adhesion is performed between the sheet 2 and the substrate 1 so that air bubbles do not enter. When the adhesive is hardened, the sheet 2 and the substrate 1 can be deformed like an integral elastic body.
- the sheet 2 surface treatment process and the sheet 2 finishing process may be performed after the sheet 2 is attached.
- the manufacturing method of the printing blanket 10 having a two-layer structure has been described.
- the uneven shape 14 is added to the portion corresponding to the printing surface 13 on the surface of the substrate 1 by a mold. Further, by performing the operations of the sheet 2 finishing process and the sheet 2 surface treatment process described above on the portion corresponding to the printing surface 13 on the surface of the substrate 1, the highest portion to the lowest portion of the uneven shape 14 on the printing surface 13 are changed.
- the height difference 15 is set to be 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface 13 has a three-dimensional surface roughness Sz (maximum height) of 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface 13 is represented by three-dimensional surface roughness Sa (arithmetic mean), it is 0.2 ⁇ m or more and 2.0 ⁇ m or less.
- the height difference 15 between the highest portion and the lowest portion of the uneven shape 14 on the printing surface 13 is 5 ⁇ m or more and 15 ⁇ m or less.
- the printing surface 13 may have a three-dimensional surface roughness Sz of 5 ⁇ m to 15 ⁇ m, or a three-dimensional surface roughness Sa (arithmetic average) of 0.5 ⁇ m to 1.2 ⁇ m.
- the printing blanket 10 according to the first embodiment includes an elastic body that deforms following the shape of the printing surface 18, and the elastic body includes a printing surface 13 that is pressed against the printing surface 18.
- No. 13 has a plurality of concave and convex shapes 14 formed in the entire area, and the height difference 15 between the highest and lowest portions of the concave and convex shapes 14 is 2 ⁇ m or more and 20 ⁇ m or less.
- the printing blanket 10 according to the first embodiment includes an elastic body that deforms following the shape of the printing surface 18.
- the elastic body includes a printing surface 13 that is pressed against the printing surface 18.
- the surface roughness Ry is 2 ⁇ m or more and 20 ⁇ m or less.
- the printing surface has a surface roughness Sa of 0.2 ⁇ m or more and 2.0 ⁇ m or less.
- the elastic body includes the base 1 and a coating layer (sheet 2) that covers at least part of the surface of the base 1.
- the printing surface 13 is the surface of the coating layer opposite to the side where the substrate 1 is located.
- the height difference 15 of the concavo-convex shape 14 formed on the printing surface 13 is reduced due to wear and dirt, and the sheet 2 can be easily replaced even if ink loss occurs in the printed image. it can.
- substrate 1 of the blanket 10 for printing can be used repeatedly, the cost concerning the blanket 10 for printing can be held down.
- the elastic body contains silicon oil.
- the method for manufacturing the printing blanket 10 according to the first embodiment includes an elastic body that deforms following the shape of the printing surface 18.
- the elastic body is a printing blanket manufacturing method including a printing surface 13 that is pressed against the printing surface 18. And it has the elastic body shaping
- the method for manufacturing the printing blanket 10 according to the first embodiment includes an elastic body having a printing surface 13 that deforms following the shape of the printing surface 18 and is pressed against the printing surface 18.
- a printing blanket manufacturing method comprising a substrate 1 and a coating layer covering at least a part of the surface of the substrate 1.
- a substrate forming step for forming the substrate 1 a coating layer forming step for forming a coating layer, a printing surface finishing step for rubbing the printing surface 13 with an abrasive after the coating layer forming step, and a coating layer for the substrate 1 And an attaching step for attaching to the surface of the substrate.
- a substrate forming step for forming the substrate 1 a coating layer forming step for forming a coating layer, a printing surface finishing step for rubbing the printing surface 13 with an abrasive after the coating layer forming step, and a coating layer for the substrate 1 And an attaching step for attaching to the surface of the substrate.
- the manufacturing method of the printing blanket 10 of Embodiment 1 it has the surface treatment process of apply
- the material constituting the printing surface 13 can be melted or corroded, so that the height difference of the uneven shape formed on the printing surface 13 can be appropriately processed.
- an elastic body that deforms following the shape of the printing surface 18 is provided, and the elastic body is pressed against the printing surface 18.
- the printing surface 13 includes a printing blanket in which a plurality of uneven shapes are formed in the entire area, and the height difference between the highest and lowest portions of the uneven shape is 2 ⁇ m or more and 20 ⁇ m or less. It is a printing method. A step of placing the ink 17 on the printing original plate 16 so as to obtain a predetermined printing pattern; a step of pressing the elastic body against the printing original plate 16 on which the ink 17 is placed; and a step of pressing the elastic body against the printing surface 18. Have.
- the printing method using the printing blanket 10 according to the first embodiment has a step of curing the ink 17 placed on the printing original plate 16 before the step of pressing the elastic body against the printing original plate 16. Also good.
- the viscosity of the ink 17 may be 100 to 1000 P, or the viscosity of the ink 17 may be 100 to 1000 P in the step of curing the ink 17. .
- the ink 17 can be prevented from being crushed and spread, and even the hard ink 17 can be transferred to the printing surface 13, so there is no ink loss and high-precision printing with high resolution. An image is obtained.
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Abstract
Description
以下、本発明に係る印刷用ブランケットについて、図面を参照しながら説明する。なお、以下に説明する実施の形態によって本発明が限定されるものではない。また、各図において同じ部分には同じ符号を付し、一部の説明を省略する。また、各図は模式的に描かれたものであって、本発明は図示された形状に限定されるものではない(特に、シートについては厚さを誇張している)。また、本明細書において、弾性体または弾性とは、これに加わる荷重と該荷重によって生じる変形量とが直線的な関係にあるものに限定するものではなく、非直線的な関係であって、加わっていた荷重が除かれた場合に、即時または所定の時間遅れの後に、元の形状に戻るものを含んでいる。
図1は、本発明の実施の形態1に係る印刷用ブランケット10の一例を表した側面図である。図1に示された印刷用ブランケット10は、略半球形状の弾性体である。略半球形状の平面部を下側にして底面としたときに、底面の中心から頂点11までの距離は、同じ大きさの底面を持つ通常の半球よりも長くなっている。つまり、印刷用ブランケットは、砲弾の様な形状になっている。なお、印刷用ブランケットの形状はこれに限定されず、例えば、半球、放物線をその対称軸周りに回転させてできる曲面、楕円体を切断した一部等の形状、砲弾形状又は半円形状を一直線上に連続的に伸ばした形状など、被印刷面18の仕様等に応じて適宜形状を変更できる。実施の形態1においては、印刷用ブランケット10の表面のうち、頂点11を中心とした所定の範囲が、印刷原版からインキ17を移し取り、被印刷面18に転写する印刷面13となる。
基体1は、例えばシリコンゴムを成形して構成される。基体1は、弾性(可撓性)を付与し、変形しやすくするためにシリコンオイルが混合されている。実施の形態1においては、基体1は、印刷用ブランケット10と同じように、砲弾形状になっているが、被印刷面18の仕様等に応じて適宜形状を変更することができる。なお、基体1は、図3に示されている印刷原版16に押し付けられた際に変形し、印刷原版16に塗布された印刷パターンに対応したインキ17をシート2に移し取ることができ、図3に示されている被印刷面18に押し付けられた際、移し取ったインキ17を被印刷面18に移し渡すことができるものであれば、その材料(物質)を限定するものではない。
シート2は、所定の厚さ(例えば、0.5mm)のシート状のシリコンゴムから構成される。実施の形態1においては、例えば基体1を構成するシリコンゴムよりも硬度が高く、シリコンオイルの含有量が少ないシリコンゴムを採用している。ただし、材質はこれに限定されず、印刷原版16に押し付けられた際、印刷原版16に塗布された印刷パターンに対応したインキ17を移し取ることができ、被印刷面18に押し付けられた際、移し取ったインキ17を被印刷面18に移し渡すことができるものであればよい。また、後述するシート2を基体1に貼り付ける工程において、基体1の表面に沿って貼り付けられるように、十分な伸縮性を有していれば良い。
図3は、本発明の実施の形態1に係る印刷用ブランケット10による印刷の説明図である。実施の形態1においては、一例として砲弾状の印刷用ブランケット10による印刷を説明する。
基体1に貼り付けられたシート2は、少なくとも基体1が位置する側と反対側の表面に凹凸形状14が形成されている。つまり、印刷用ブランケット10は、印刷面13が凹凸形状14を有する。さらに言うと、印刷面13は、凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下の凹凸形状14が形成されている。言い換えると、印刷面13は、三次元表面粗さSz(最大高さ)2μm以上20μm以下になっている。また、印刷面13は、三次元表面粗さSa(算術平均)で表すと、0.2μm以上2.0μm以下になっている。印刷面13に付された凹凸形状14は、印刷面13の全域にわたって形成されている。
(基体1成形工程)
基体1は、例えばシリコンゴムを金型を用いて成形される。実施の形態1においては、印刷用ブランケット10は2層構造になっているため、基体1の表面粗さについては特に調整することなく成形される。印刷用ブランケット10を構成する弾性体が1つの成形品により構成される場合は、印刷用ブランケット10の印刷面13を成形する部分の金型の表面を所定の表面粗さに予め加工しておく。すると、金型の表面の凹凸形状14が弾性体に転写されて成形される。この工程は、本発明の基体成形工程に相当するものである。
シート2も例えばシリコンゴムを金型を用いて成形される。実施の形態1においては、シート2は、印刷用ブランケット10を構成する弾性体の表面を構成する。つまり、シート2が印刷面13を構成する。よって、シート2の少なくとも一方の表面を成形する部分の金型の表面を所定の表面粗さに予め加工しておく。すると、金型の表面の凹凸形状がシート2に転写されて成形される。成形後のシート2の表面は所定の凹凸形状14を有する。実施の形態1においては、成形後のシート2の表面は、凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下となるように成形されている。または、シート2の成形時には、凹凸形状14の最も高い部分から最も低い部分の高低差15が20μm以上となるように成形されていても良い。この工程は、本発明の被覆層成形工程に相当するものである。
シート2成形工程において、成形後のシート2の表面が凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下となるように成形されている場合は、そのまま後述するシート2貼り付け工程に進んでも良い。しかし、凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下の範囲であっても、さらにその凹凸形状14の最も高い部分から最も低い部分の高低差15を所定の値にしたい場合には、本工程で、例えば研磨布紙等の研磨材を用いてシート2の表面をこすり、凹凸形状14の突出部分、つまり高い部分を削る。または、メラミンスポンジなどの研磨スポンジを用いても良い。また、シート2の表面の凹凸形状14の最も高い部分から最も低い部分の高低差15が20μm以上となるように成形されている場合には、凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下になるように、シート2の表面を研磨布紙などでこすり凹凸形状14の高い部分を削る。これにより、凹凸形状14の最も高い部分から最も低い部分の高低差15が2μm以上20μm以下の範囲にすることができる。
この工程は、本発明の印刷面仕上げ工程に相当するものである。
シート2の表面の凹凸形状14の高い部分を削りとるにあたり、上述の仕上げ工程の前にシート2の表面を溶かし、または腐食し、凹凸形状14の高い部分を削り取りやすくする処理を行っても良い。実施の形態1においては、例えば、エタノールなどの溶剤をシート2の表面に塗布する。または、シート2の材質に応じ、表面の凹凸形状14の高い部分を削り取りやすくするようにシート2の材質を溶かす溶剤を選択しても良い。また、溶剤をシート2の表面に塗布してから上述のシート2仕上げ工程に進むのではなく、溶剤をシート2の表面に塗布とシート2仕上げ工程を同時に行っても良い。例えば、メラミンスポンジに溶剤をしみこませてシート2の表面をこすっても良い。この工程は、本発明の表面処理工程に相当するものである。
次にシート2を基体1に貼り付ける。シート2と基体1とは例えば接着剤により接着される。シート2と基体1との間に、気泡が入らないように接着される。接着剤が固まると、シート2と基体1とが一体の弾性体のように変形することができる。なお、シート2表面処理工程及びシート2仕上げ工程は、シート2の貼り付け後に実施しても良い。
また、好ましくは、印刷面13の凹凸形状14の最も高い部分から最も低い部分の高低差15が5μm以上15μm以下になるようにするとよい。また、表面粗さで表すと、印刷面13は、三次元表面粗さSz5μm以上15μm以下、又は三次元表面粗さSa(算術平均)で0.5μm以上1.2μm以下とすると良い。
(1)実施の形態1の印刷用ブランケット10は、被印刷面18の形状に追従して変形する弾性体を備え、弾性体は、被印刷面18に押し付けられる印刷面13を備え、印刷面13は、全域に複数の凹凸形状14が形成され、前記凹凸形状14の最も高い部分と最も低い部分との高低差15が2μm以上20μm以下である。
また、実施の形態1の印刷用ブランケット10は、被印刷面18の形状に追従して変形する弾性体を備え、弾性体は、被印刷面18に押し付けられる印刷面13を備え、印刷面13は、表面粗さRyが2μm以上20μm以下である。
さらに、実施の形態1の印刷用ブランケット10は、前記印刷面は、表面粗さSaが0.2μm以上2.0μm以下である。
このように構成することにより、印刷に用いるインキ17の粘度が高い場合、具体的には100~1000Pであっても、印刷用ブランケット10を印刷原版16に押し付けたときにインキ17が印刷用ブランケット10の印刷面に確実に移し取られる。これにより、インキ抜けがなく解像度の高い精密な印刷画像が得られる。
このように構成することで、2層構造の弾性体においても、上記(1)で述べた効果が得られる。弾性体が基体1とシート2とを備えることにより、印刷用ブランケットの使用によりシート2の表面である印刷面13に摩耗、劣化、汚損等が発生しても、シート2を交換することができる。つまり、印刷を繰り返すことにより印刷面13に形成された凹凸形状14の高低差15が摩耗や汚れにより小さくなって、印刷画像にインキ抜けが発生しても、シート2を容易に交換することができる。これにより、印刷用ブランケット10の基体1は繰り返し使用することができるため、印刷用ブランケット10にかかるコストを抑えることができる。
また、実施の形態1の印刷用ブランケット10の製造方法は、被印刷面18の形状に追従して変形し、被印刷面18に押し付けられる印刷面13を有する弾性体を備え、弾性体は、基体1と、基体1の表面の少なくとも一部を覆う被覆層と、を備える、印刷用ブランケットの製造方法である。そして、基体1を成形する基体成形工程と、被覆層を成形する被覆層成形工程と、被覆層成形工程の後に、印刷面13を研磨材でこする印刷面仕上げ工程と、被覆層を基体1の表面に貼り付ける貼り付け工程と、を有する。
このように構成されることにより、印刷用ブランケット10の印刷面13に適正な高低差を持つ凹凸形状14を形成することができる。
または、印刷面仕上げ工程の前に、印刷面13にオゾンガスを吹き付ける表面処理工程を有する。
このように構成されることにより、印刷面13を構成する材質を溶かし、又は腐食させることができるため、印刷面13に形成された凹凸形状の高低差を適正に加工することができる。
また、実施の形態1の印刷用ブランケット10を使用した印刷方法においては、弾性体を印刷原版16に押し付ける工程の前に、印刷原版16に載せられたインキ17を硬化させる工程を有していても良い。また、実施の形態1の印刷用ブランケット10を使用した印刷方法においては、インキ17の粘度を100~1000Pとする、又はインキ17を硬化させる工程において、インキ17の粘度を100~1000Pとしても良い。
このように構成することにより、インキ17がつぶれて広がるのを抑えることができ、かつ硬いインキ17であっても印刷面13に転写させることができるため、インキ抜けがなく解像度の高い精密な印刷画像が得られる。
Claims (13)
- 被印刷面の形状に追従して変形する弾性体を備え、
前記弾性体は、
前記被印刷面に押し付けられる印刷面を備え、
前記印刷面は、
全域に複数の凹凸形状が形成され、前記凹凸形状の最も高い部分と最も低い部分との高低差が2μm以上20μm以下である、印刷用ブランケット。 - 被印刷面の形状に追従して変形する弾性体を備え、
前記弾性体は、
前記被印刷面に押し付けられる印刷面を備え、
前記印刷面は、
表面粗さSzが2μm以上20μm以下である、印刷用ブランケット。 - 前記印刷面は、
表面粗さSaが0.2μm以上2.0μm以下である、請求項1又は2に記載の印刷用ブランケット。 - 前記弾性体は、
基体と、該基体の表面の少なくとも一部を覆う被覆層と、を備え、
前記印刷面は、
前記基体の位置する側に対し反対側の前記被覆層の表面である、請求項1~3の何れか1項に記載の印刷用ブランケット。 - 前記弾性体は、
シリコンオイルを含有する、請求項1~3の何れか1項に記載の印刷用ブランケット。 - 被印刷面の形状に追従して変形する弾性体を備え、
前記弾性体は、
前記被印刷面に押し付けられる印刷面を備え、
前記印刷面は、
全域に複数の凹凸形状が形成されている、印刷用ブランケットの製造方法であり、
前記弾性体を成形する弾性体成形工程と、
前記弾性体成形工程の後に、前記印刷面を研磨材でこする印刷面仕上げ工程と、を有する印刷用ブランケットの製造方法。 - 被印刷面の形状に追従して変形し、前記被印刷面に押し付けられる印刷面を有する弾性体を備え、
前記弾性体は、
基体と、該基体の表面の少なくとも一部を覆う被覆層と、を備え、
前記印刷面は、
前記基体の位置する側に対し反対側の前記被覆層の表面であり、全域に複数の凹凸形状が形成されている、印刷用ブランケットの製造方法であり、
前記基体を成形する基体成形工程と、
前記被覆層を成形する被覆層成形工程と、
前記被覆層成形工程の後に、前記印刷面を研磨材でこする印刷面仕上げ工程と、
前記被覆層を前記基体の表面に貼り付ける貼り付け工程と、を有する、印刷用ブランケットの製造方法。 - 前記印刷面仕上げ工程の前に、前記印刷面に溶剤を塗布する表面処理工程を有する、請求項6又は7に記載の印刷用ブランケットの製造方法。
- 前記印刷面仕上げ工程の前に、前記印刷面にオゾンガスを吹き付ける表面処理工程を有する、請求項6又は7に記載の印刷用ブランケットの製造方法。
- 被印刷面の形状に追従して変形する弾性体を備え、
前記弾性体は、
前記被印刷面に押し付けられる印刷面を備え、
前記印刷面は、
全域に複数の凹凸形状が形成され、前記凹凸形状の最も高い部分と最も低い部分との高低差が2μm以上20μm以下である、印刷用ブランケットを使用した印刷方法であって、
所定の印刷パターンになるように印刷原版にインキを載せる工程と、
前記弾性体を前記インキが載せられた前記印刷原版に押し付ける工程と、
前記弾性体を前記被印刷面に押し付ける工程と、を有する、印刷用ブランケットを使用した印刷方法。 - 前記弾性体を前記印刷原版に押し付ける工程の前に、前記印刷原版に載せられた前記インキを硬化させる工程を有する、請求項10に記載の印刷用ブランケットを使用した印刷方法。
- 前記インキの粘度を100~1000Pとする、請求項10又は11に記載の印刷用ブランケットを使用した印刷方法。
- 前記インキを硬化させる工程において、前記インキの粘度を100~1000Pとする、請求項11に記載の印刷用ブランケットを使用した印刷方法。
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EP3450171A1 (en) | 2019-03-06 |
JPWO2017187626A1 (ja) | 2019-02-28 |
CN109070578A (zh) | 2018-12-21 |
EP3450171A4 (en) | 2019-11-20 |
KR20180120241A (ko) | 2018-11-05 |
KR102417596B1 (ko) | 2022-07-06 |
CN109070578B (zh) | 2021-06-18 |
EP3450171B1 (en) | 2024-01-17 |
US20190134973A1 (en) | 2019-05-09 |
JP6835829B2 (ja) | 2021-02-24 |
KR20200123291A (ko) | 2020-10-28 |
US11072163B2 (en) | 2021-07-27 |
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