JP2024071958A - Manufacturing method of stupa - Google Patents

Abstract

To perform printing with less bleeding and without the texture and color of a wooden basis material significantly changed.SOLUTION: A plate material 3 for a stupa is prepared, and chalk powder 5 is applied thereto so as to enter recessed areas by fixing and rubbing chalk on a surface 3a. In this state, transparent UV curable ink is applied on the surface, and the UV curable ink is cured with a UV lump. This allows a transparent layer 7 to be formed on the chalk powder. A character 9 is printed on the cured layer 7 with an inkjet printer.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for printing on wood, and in particular to a printing technique that maintains texture while minimizing bleeding.

Temples need to produce several hundred stupas per month. Patent Document 1 discloses a printer for stupas that mechanizes this work.

JP 2005-160563 A

This printer is a thermal transfer printer, so the transfer sheet is wasted. Also, because the object is a stupa, there is a problem that printing cannot be done properly due to changes in the pressure of the rollers that press it. Screen printing, which does not have these problems, can also be considered, but it requires making a plate each time.

The inventor then came up with the idea of applying a transparent UV coating to the stupa and then printing text on it using an inkjet printer.

However, when printing characters using an inkjet printer after the UV coating process, the texture of the stupa changes considerably and the characters bleed. This bleeding problem is particularly prevalent in parts of the characters that have an oblique component.

It is also possible to use abrasive powder as a filler before applying the UV-curable ink, but this is first dissolved in water and then applied to the surface 3a. This not only requires a drying process, but also poses the risk of warping after drying in thin plate materials.

This same problem occurs when printing on wood other than stupas.

The present invention aims to solve the above problems and provide a wood printing method and printed matter that can print with minimal bleeding while retaining the texture of the wood.

(1) The method for manufacturing a stupa according to the present invention includes a chalk application step in which white chalk powder is dried and applied to the unprinted surface of the stupa on which text is to be printed, a UV-curable ink application step in which UV-curable ink is applied to the surface on which text is to be printed, a curing step in which the UV-curable ink is cured by irradiating it with ultraviolet light, and a printing step in which text is printed on the cured UV-curable ink surface by an inkjet printer.

In this way, by applying a dry coat of white chalk powder as a pretreatment to the UV-cured ink surface, it is possible to produce a stupa with minimal bleeding while still retaining the texture of the wood, even when printed with an inkjet printer. It is also possible to provide a printing method that produces the impression of less bleeding in diagonal lines.

(2) In the method for manufacturing a stupa according to the present invention, the chalk application step is carried out by rubbing solid white chalk onto the surface on which the characters are to be printed. Therefore, the white chalk powder can be easily applied in a dry state.

(3) The method for printing on wood according to the present invention includes a powder application step of applying dried powder to an unprinted surface of wood to be printed, a UV-curable ink application step of applying UV-curable ink to the surface to be printed, a curing step of curing the UV-curable ink by irradiating it with ultraviolet light, and a printing step of printing on the cured UV-curable ink surface with an inkjet printer.

Therefore, even when printing with an inkjet printer, it is possible to provide a wood printing method that preserves the texture of the wood and causes little bleeding.

In this specification, "dry application" refers to applying a powdered material to the wood surface in a dry state.

FIG. 2 is a diagram showing the appearance of the board material 3 of the stupa. FIG. 2 is a diagram illustrating a method for manufacturing a stupa according to the present invention. 13 is a comparative photograph illustrating the degree of bleeding when the surface treatment of the surface 3a of the plate material 3 is changed.

Figure 1 shows the plate material 3 used in the stupa of the present invention. Below, the manufacturing method of the stupa will be explained using Figure 2.

Figure 2A is a cross-sectional view of Figure 1A-A. The board 3 is formed so that its longitudinal direction follows the grain of the wood. Therefore, the surface 3a is uneven, as shown in Figure 2A.

The chalk is rubbed against the surface 3a while still fixed in place. As a result, as shown in FIG. 2B, the chalk powder 5 is applied so that it penetrates into the recessed area. In this embodiment, white calcium carbonate chalk is used as the chalk, but this is not limited to this, and calcium gypsum chalk may also be used.

The chalk can be applied in a variety of directions, including along the grain of the board 3, perpendicular to the grain, diagonally, or circularly, allowing for imprinting in a variety of ways.

In this state, a transparent UV curable ink is applied to the surface and the UV curable ink is cured by a UV lamp (see FIG. 2C). In this embodiment, the thickness of the UV curable ink is 5 to 7 μm, but is not limited to this. If the thickness of the UV curable ink coating is too thick, it becomes difficult to feel the texture of the wood, and there is a possibility that problems such as cracks may occur on the surface due to shrinkage during curing. Conversely, if it is too thin, the bleeding reduction effect, which is an effect of the present invention, is reduced. In addition, UV clear ink manufactured by United Barcode System is used as the UV curable ink, but is not limited to this. As a result, a transparent layer 7 is formed on top of the chalk powder.

In addition, as the UV lamp, a UV LED lamp with a wavelength of 380 to 420 nm and energy per unit area of 10.8 W/ ^cm2 was used, but the present invention is not limited to this.

Next, characters 9 are printed on the hardened layer 7 using an inkjet printer. In this embodiment, in order to improve the printing speed, multiple print heads are arranged in the short direction of the plate material 3, making scanning in the width direction unnecessary.

The effect of the present invention will be explained using Figure 3. In all of Figures 3A to 3D, a line with a width of 0.5 mm was printed perpendicular to the longitudinal direction of the plate material 3.

Figure 3A shows the result of printing with an inkjet printer on the surface 3a of the board 3 without any processing, resulting in considerable bleeding. Figure 3B shows the result of printing with an inkjet printer after UV-curable ink has been applied to the board 3 and cured. Although there is less bleeding compared to the bare base, there is still some overall bleeding. In this case, the texture and color of the wood base have become darker, although this is difficult to see in the photograph.

Figure 3C shows the result when white chalk is rubbed onto board 3 and then printed with an inkjet printer. Although there is less bleeding compared to when the base is left as is, there is still some overall bleeding. Figure 3D shows the result when white chalk is rubbed onto board 3, UV-curable ink is applied and cured, and then printing is performed with an inkjet printer. As you can see, there is much less bleeding compared to the other cases. Also, by applying white chalk powder as a bottom layer of UV-curable ink, there is little change in the texture and surface color of the board 3's base material. In other words, there is no significant change in the texture or color of the wood base material.

This allows for printing with less bleeding and without significantly altering the texture and color of the wood base.

In particular, when printing Chinese characters with diagonal lines, such as stupas, it is possible to provide a printing method that produces a feeling of less bleeding.

In this embodiment, solid fir wood is used as the board 3, but the present invention can also be applied to cases where multiple boards are stacked and glued together to resemble a single board.

In this embodiment, as a pretreatment for the UV-curable ink, chalk powder is applied in a dry state to fill in some of the wood grain. This prevents the surface from becoming shiny overall, and preserves the texture of the wood. In addition, the use of white chalk reduces the shine of the surface. Note that white powder other than chalk may be rubbed into the wood grain in a dry state, but chalk powder is more preferable due to its good sliding properties.

3... Board material 3a... Surface 5... Chalk powder 7... Layer 9... Letters

Claims (3)

A chalk application step in which white chalk powder is dried and applied to the unprinted surface of the stupa where the characters are to be printed;
A UV curable ink application step of applying a UV curable ink to the surface to be printed with characters;
a curing step of curing the UV curable ink by irradiating it with ultraviolet light;
a printing step of printing characters on the cured UV-cured ink surface with an inkjet printer;
A method for manufacturing a stupa equipped with the above structure. The method for manufacturing a stupa according to claim 1,
the chalk applying step is carried out by rubbing a solid white chalk onto the surface to be printed with characters;
A method for manufacturing a stupa, characterized by the above. a powder application step in which dry powder is applied to the unprinted surface of the wood to be printed;
A UV curable ink application step of applying a UV curable ink to the printing surface;
a curing step of curing the UV curable ink by irradiating it with ultraviolet light;
a printing step of printing on the cured UV-cured ink surface with an inkjet printer;
A printing method for wood comprising:

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