JPH03188965A - Roll for printing - Google Patents

Abstract

PURPOSE:To allow a cylindrical rubber roll to cause elastic deformation in accordance with a rugged surface to be coated and to perform complete coating by making cuts in the peripheral surface of the rubber roll. CONSTITUTION:Many cuts 3 are concentrically made in the rubber part 2 of a roll 1 for printing. Even if the surface of a base material A to be coated is rugged, the resulting roll causes elastic deformation in accordance with the rugged surface and coating is completely performed. The cuts 3 function as coating material holding parts, a shade of color can be rendered to a coating film by the pressing force of the rubber 2, that is, the rate of elastic deformation in correspondence with the height of the rugged surface and a rugged pattern can be emphasized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing roll capable of forming a coating film on the uneven surface of a base material made of a metal material or an inorganic material.

[Conventional technology]

Generally, a flow coater, a roll coater, a sprayer, etc. are used to coat a base material made of an inorganic material such as a metal material or a ceramic material.

[Problem to be solved by the invention]

However, in the case of spraying, there are disadvantages such as deterioration of the on-site environment, reduction in paint efficiency, and high cost. In addition, in the case of a flow coater, unpainted areas occur due to the transfer speed of the substrate, the height difference of the uneven pattern, the viscosity of the paint, etc., and the occurrence of unpainted areas due to the generation of bubbles when the paint is supplied to the equipment. There was a disadvantage that so-called membrane breakage occurred. Further, in the case of a roll coater, when a rubber roll is used as a printing roll, there is a disadvantage that coating can only be performed on a convex surface of an uneven surface. For this reason, sponge rolls are used as printing rolls, but sponge rolls leave traces of the roll surface on the painted surface and swell and deform due to paint, especially thinner used as a solvent, making it difficult to use continuously for long periods of time. There was an intolerable disadvantage.

[Means to solve the problem]

In order to eliminate such drawbacks, the present invention uses a rubber roll as the printing roll used in the roll coater, and by making cuts on the surface of the rubber roll,
The present invention proposes a printing roll that utilizes the elasticity of rubber and can apply coating at a density that corresponds to the height difference of an uneven surface.

〔Example〕

The printing roll according to the present invention will be explained in detail below using the drawings. FIG. 1 shows a typical embodiment of a printing roll according to the present invention, where 2 indicates a rubber portion and 3 indicates a cut. That is, the printing roll 1 is used in a roll coater to transfer the paint onto the surface to be painted of a base material, and the rubber portion 2 is the part that directly contacts and transfers the paint to the surface to be painted. The cuts 3 are provided in the rubber part 2, and may be formed in multiple concentric circles on the circumference of the printing roll, or in a spiral shape ((
(a) Figure), parallel to the axis 1a direction ((b) Figure), or a combination of these ((C) Figure). This cut 3 has a groove shape as shown in FIG. 2 as a partially enlarged view, or various cross-sectional shapes as shown in FIGS. As shown in FIG. 3, even if there are irregularities on the surface of the base material A to be coated, the coating can be applied by following the irregularities. The cut 3 also functions as a place to hold the paint, and the density of the paint film can be formed according to the height of the uneven surface by the pressing force of the rubber part 2 with the base material A, that is, the elastic deformation rate. It is possible to emphasize the uneven pattern. The hardness of the rubber part 2 and the depth of the cut 3 vary depending on the unevenness of the surface to be painted of the base material A, but the hardness is 30 to 5.
0 degrees, and the depth is about 0.5 to 1 mm.

In addition, base materials A include surface-treated steel sheets, fluororesin coated steel sheets, zinc-nickel alloy plated steel sheets, aluminum-zinc alloy plated steel sheets (product names: Gulfupun, Galvalume Steel Sheet, Super Zinc), aluminum sheets, aluminum alloy sheets, copper sheets, Metal plates made of one type of clad steel plate, vibration-damping steel plate (including embossed plates, lysine-coated plates, and enameled plates), or (not shown) gypsum boards, slate plates, calcium carbonate plates, calcium silicate plates, and cement. The main raw materials are calcium, aluminate, sulfate, and hydrate, mixed with pulp, glass fiber, and perlite, asbestos cement calcium silicate board, foamed concrete board, and cement mixed with high-strength alkali-resistant glass fiber. A ceramic board made of asbestos cement mixed with pulp or perlite, or an inorganic board such as a ceramic board, whose irregularities do not deform much even when pressed on a printing roll. Those things are preferable. Further, the uneven pattern may be any pattern such as stucco, cast, trapping, wood texture, moon pattern, wave pattern, etc., and is determined depending on the use of the base material A. Furthermore, paints include synthetic resins such as fluororesin, acrylic resin, polyurethane resin, epoxy resin, melamine resin, alkyd resin, polyester resin, furan resin, vinyl resin, urea resin, maleic resin, styrene resin, phenolic resin, and oil. Free polyester, styrenated alkyd resin, aluminum paint, chilimene enamel, vinyl copolymer, polyvinyl butyral, ethyl cellulose, etc. are used, and various pigments are added to the room temperature curing type, heating, heat curing type paint, or UV curing. It is mold paint or glaze, etc., and the viscosity is about 20
~2000 centipoise.

Here, one embodiment of the coating method using the printing roll A according to the present invention will be briefly described.The printing roll is as shown in FIG. 1, and the rubber portion 2 has a depth of 0.
5, the cut ends 3 of the body were formed in concentric circles, the base material A was a 0.27 mm thick color steel plate, and the surface to be painted was an uneven surface with a wood grain pattern, and the paint was polyester resin paint. did.

Therefore, the long base material A was pressed between a printing roll and a metal roll (not shown), and the printing roll 1 was rolled at a height of 20 m/m.
Rotate in. Then, as shown in FIG. 3, the rubber part 2 came into contact with the base material A, and a film thickness was formed that corresponded to the height of the uneven pattern, that is, the thickness was lighter in higher areas and thicker in lower areas. As a result, the shading of the paint promoted the uneven pattern, resulting in a painting with depth and excellent design. Note that, after the paint has been transferred, the base material A is transported to a coating film curing process to be made into a product.

〔Effect of the invention〕

As described above, according to the printing roll according to the present invention, even if the coating surface of the base material has an uneven pattern, it can be elastically deformed to follow the unevenness and can be coated. can.

In addition, the local pressing force of the printing roll creates shading depending on the height of the uneven surface, making it possible to paint a design with depth and three-dimensional effect. In addition, painting can be performed after forming the uneven pattern on the base material, and it is possible to cover scratches on the undercoat film when forming the uneven pattern when a colored steel plate or the like is used as the base material. Weather resistance can be improved. Furthermore, since a rubber roll is used as the printing roll, continuous use for a long time is possible.

It has the following effects and characteristics.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the printing roll according to the present invention, FIG. 2 is an explanatory diagram illustrating cuts, FIG. 3 is a conceptual diagram illustrating the usage state of the printing roll, and FIG. Figure (a
) to (C) and FIGS. 5(a) to (d) are explanatory diagrams showing other embodiments. Top: Printing roll, 3: Cut. 483-

Claims (1)

[Claims] (1) A printing roll for forming a coating film in an arbitrary pattern on the painted surface of a base material having an uneven surface, characterized in that a slit is made in the outer peripheral surface of a cylindrical rubber roll.