This application is an application under 35 U.S.C. 371 of International Application No. PCT/JP2016/072472 filed on Aug. 1, 2016, the entire contents of which are incorporated herein by reference.
The present invention relates to a printing blanket used for blanket printing involving transfer of an ink from a printing original plate to the printing blanket and then from the printing blanket to a surface to be printed, and to a printing method using the printing blanket.
Blanket printing has been performed in the following manner. A printing surface of a printing blanket is pressed against a printing original plate so that an ink arranged on the printing original plate corresponding to a printing pattern is transferred to the printing blanket. Subsequently, the printing surface of the printing blanket having the transferred ink is pressed against a surface to be printed so that the transferred ink on the printing blanket is transferred to the surface to be printed. In this manner, the printing pattern is printed on the surface to be printed.
A cover member for a display portion of, for example, a touch panel in electronic devices such as a smartphone is manufactured through use of, for example, a flat glass sheet. The cover member includes a shielding layer on a surface along an edge of the flat glass sheet to cover, for example, wires in a portion other than the display portion.
In the related art, the shielding layer is arranged on a flat surface, for example, by being formed through screen printing or by bonding a thin film (see, for example, Patent Literature 1)
Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2015-68909
In recent years, as the cover for a display member of a touch panel in electronic devices such as a smartphone, a member having a curved surface and being made of a material such as glass and polycarbonate is adopted in many cases to make a screen look wider. The cover for a display member has been a flat plate, and hence the shielding layer can be printed on the cover by screen printing. However, when the cover for a display member is manufactured through use of a member having a curved surface, to arrange the shielding layer, the cover is manufactured by the steps of masking a portion other than a portion for arranging the shielding layer, coating the portion for arranging the shielding layer, cutting off a part of the coated portion by laser processing, and finishing. Thus, the steps are complicated and cause a high rate of defects, resulting in high manufacturing cost.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a printing blanket and a printing method that enable high-quality printing on a printing member, for example, a cover member for a touch panel having a curved surface and enable reduction in cost for arranging a shielding layer.
According to one embodiment of the present invention, there is provided a printing blanket including a base member formed of an elastic material having a three-dimensional shape with a recessed portion or a hole portion in a center of the base member and a ridge line surrounding the recessed portion or the hole portion, and a printing surface arranged on a surface of the base member on an outer side from the ridge line.
Further, a printing method according to one embodiment of the present invention is a printing method using the above-mentioned printing blanket. The printing method includes an original plate pressing step of pressing the printing surface against a printing original plate having an ink arranged on the printing original plate, and an ink transferring step of transferring the ink to a curved surface portion of a printing member having a flat surface and a curved surface in an edge portion of the flat surface by pressing the printing surface against the curved surface portion.
With the printing blanket and the printing method using the printing blanket according to one embodiment of the present invention, a force at which the printing blanket is pressed is concentrated to a curved surface corresponding to a printing portion and applied uniformly over the entire printing portion. Consequently, a printed layer has a uniform thickness, and printing can be performed without unevenness. Further, the method involves a simple step of merely pressing the printing blanket. Consequently, the quality of printing as the shielding layer of the cover member for a display portion, for example, a touch panel having a curved surface can be ensured, and cost for printing can be reduced.
A printing blanket according to the present invention is described below with reference to the drawings. The present invention is not limited to an embodiment described below. In the drawings, the same parts are denoted by the same reference signs, and the description of the same parts is partially omitted herein. Each drawing is a schematic illustration, and the present invention is not limited to the illustrated forms. In particular, the thickness of the sheet is exaggerated. The term “elastic body” or “elastic” as used herein is not limited to a member exhibiting a linear relationship between a load applied to the member and the amount of deformation caused by the load, but includes a member exhibiting a non-linear relationship and is restored to an original state promptly or after a predetermined time period when the applied load is released.
The printing blanket 10 includes the base member 1 having a substantially rectangular shape when the printing blanket 10 is viewed in a direction from a side on which the printing original plate 20 and the printing member 30 are arranged on the printing device, that is, in a direction from a lower side in
Corner portions 16 of the base member 1 having a substantially rectangular shape when the base member 1 is viewed in the direction from the lower side are each formed to have a round shape. The roundness of each of the corner portions 16 is also suitably changed corresponding to the curved surface 31 of the printing member 30.
The printing blanket 10 is pressed against the printing original plate 20 from the ridge line 11 to be deformed, and a predetermined region mainly of the ridge line 11 is pressed against a surface of the printing original plate 20. The predetermined region is referred to as the printing surface 18. The ink 40 arranged on the printing original plate 20 adheres to be transferred to the printing surface 18 of the printing blanket 10. The base member 1 is easily deformed because the base member 1 is made of, for example, a silicon rubber containing a large amount of silicon oil.
Before the printing blanket 10 is pressed against the printing original plate 20, a solvent may be applied to the printing surface 18 to bring the printing surface 18 into a wet state. This treatment allows the ink 40 to be easily transferred to the printing surface 18.
As illustrated in
<State of Printing Surface 18 During Printing>
As illustrated in
Further, as illustrated in
In Embodiment 1, as illustrated in
(1) The printing blanket 10 according to Embodiment 1 includes the base member 1 made of an elastic material having a three-dimensional shape with the recessed portion 12 or the hole portion 12a in the center of the base member 1 and the ridge line 11 surrounding the recessed portion 12 or the hole portion 12a, and the printing surface 18 arranged on the surface of the base member 1 on the outer side from the ridge line 11.
With the above-mentioned configuration, the printing blanket 10 can be uniformly brought into contact with a curved surface portion of the printing member 30, for example, a cover member having a curved surface to be adopted in a touch panel of a smartphone or other devices, and hence good-quality printing can be performed on a curved surface.
(2) In the printing blanket 10 according to Embodiment 1, the base member 1 includes the inner layer 2 and the outer coating layer 3. The outer coating layer 3 may have a sheet shape, may be bonded to the surface of the inner layer 2, and may be made of a material having hardness equal to or more than hardness of the inner layer 2.
With the above-mentioned configuration, a sheet-shaped rubber having hardness higher than that of the inner layer 2 is used for the printing surface 18, and hence the durability of the printing surface 18 of the printing blanket 10 can be ensured. Further, when a scratch or dirt is caused on the printing surface 18, the printing surface 18 can be removed and replaced by another sheet-shaped rubber. Further, the inner layer 2 is made of, for example, a soft silicon rubber containing silicon oil, and the ooze of the silicon oil from the inner layer 2 can be reduced by arranging the outer coating layer 3. Thus, the printing blanket 10 can reduce the contamination of the printing original plate 20 and the printing member 30 with silicon oil.
(3) In the printing blanket 10 according to Embodiment 1, the inner layer 2 may include a plurality of laminated layers.
With the above-mentioned configuration, the dimensions of the inner layer 2 can be changed corresponding to the shape of the printing member 30. Further, when the inner layer 2 is damaged, the inner layer 2 can also be removed and replaced.
(4) In the printing blanket 10 according to Embodiment 1, it is preferred that the outer coating layer 3 have a thickness of 0.1 mm or more and 1.0 mm or less.
With the above-mentioned configuration, the outer coating layer 3 does not inhibit the deformation of the inner layer 2, and hence the printing blanket 10 can be deformed to follow the printing member 30. Moreover, the printing blanket 10 can exhibit the effect of the above-mentioned section (2). However, the thickness of the outer coating layer 3 is not limited only to the above-mentioned thickness as long as the outer coating layer 3 does not inhibit the deformation of the inner layer 2 and can be deformed to follow the printing member 30.
(5) In the printing blanket 10 according to Embodiment 1, the inner layer 2 may be made of a silicon rubber containing silicon oil.
With the above-mentioned configuration, the printing blanket 10 can be formed to be easily deformed and easily follow the shape of the printing member 30, and the effect described in the above-mentioned section (1) can be reliably exhibited.
(6) A printing method using the printing blanket 10 according to Embodiment 1 includes an original plate pressing step of pressing, against the printing original plate 20 having the ink 40 arranged on the printing original plate 20, the printing surface 18 arranged on the surface of the base member 1 made of an elastic material having a three-dimensional shape with the recessed portion 12 or the hole portion 12a in the center of the base member 1 and the ridge line 11 surrounding the recessed portion 12 or the hole portion 12a, the surface of the base member 1 being on the outer side from the ridge line 11, and an ink transferring step of transferring the ink 40 to the curved surface portion of the printing member 30 having a flat surface and a curved surface in an edge portion of the flat surface by pressing the printing surface 18 against the curved surface portion.
With the above-mentioned configuration, printing can be performed with good quality on the printing member 30 such as a cover member for a display portion of, for example, a touch panel having the curved surface 31. Further, the printing blanket 10 is also excellent in durability, and hence it is possible to perform printing suitable for mass production of a cover member for a display portion of, for example, a touch panel.
1 base member 2 inner layer 3 outer coating layer 10 printing blanket 10a printing blanket 11 ridge line 12 recessed portion 13 protruding portion 14 base portion 15 mounting surface 16 corner portion 18 printing surface 20 printing original plate 30 printing member 30a printing member 31 curved surface 32 display portion 40 ink 50 pressing force 51 arrow
Filing Document | Filing Date | Country | Kind |
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PCT/JP2016/072472 | 8/1/2016 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/025299 | 2/8/2018 | WO | A |
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102781679 | Nov 2012 | CN |
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Number | Date | Country | |
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20200039276 A1 | Feb 2020 | US |