JP2004050010A - Cylinder and coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder not requiring the fine pressure adjustment of an applying roller for supplying a coating agent. <P>SOLUTION: Coating surface parts 13, to which the coating agent is applied in the peripheral surface part 12 of the cylinder 11, are formed so as to have a height protruding in a diameter direction from the peripheral surface part 12 other than the coating surface parts 13, and ridge parts 15 having almost the same height that the coating surface parts 13 and continuing peripherally are formed on both axial sides of the peripheral surface part 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
FIELD OF THE INVENTION
The present invention relates to a cylinder for supplying a coating agent to an outer peripheral surface of a metal cylindrical body and transferring the coating agent applied to the peripheral surface to a blanket cylinder, and a coating apparatus including the cylinder.
[0002]
[Prior art]
In an offset printing press, ink is applied to the plate surface of a plate cylinder around which a printing plate is wound, and the ink image is transferred to a blanket of a blanket cylinder. An ink image is transferred from the blanket to the recording material conveyed to the nip portion between the blanket cylinder and the impression cylinder.
In the process before and after the ink image is formed on the recording material, for example, a primer liquid is applied to make the ink easily adhere to the material to be recorded, or a varnish liquid is applied as a finish on the ink image. Or be done. Such a coating agent such as a primer liquid or a varnish liquid is applied by a coating apparatus, and is used as a part of an offset printing machine or provided together with an offset printing machine.
[0003]
Hereinafter, a coating apparatus for applying a varnish liquid as a coating agent to a material to be coated will be described as an example. On the outer peripheral surface of the metal cylindrical cylinder, only a portion to which the varnish liquid is applied is formed with a protruding surface projecting radially outward from the other peripheral surface. The varnish liquid is supplied from a varnish dish filled with the varnish liquid via a setting roller, and the varnish liquid is applied only to the protruding surface of the plate cylinder which is in pressure contact with the setting roller. Then, a varnish liquid is applied from the projecting surface of the cylinder to the material to be applied via a blanket.
[0004]
[Problems to be solved by the invention]
However, there is a problem that it is difficult to adjust the nip pressure between the application roller and the cylinder for supplying the varnish liquid, that is, the pressure of the application roller against the cylinder. If the pressure of the application roller is too strong, the varnish liquid may be applied to the peripheral surface other than the protruding surface of the cylinder, and the varnish liquid may be transferred to a blanket, a recording material, an impression cylinder, and the like. On the other hand, if the pressure of the application roller is too weak, the amount of varnish liquid supplied to the protruding surface is insufficient, and the varnish liquid applied to the recording material is insufficient, resulting in poor finish.
In addition, since the setting roller is pressed against the protruding surface of the cylinder, there is a possibility that the varnish liquid may be scattered on the peripheral surface of the cylinder by an impact due to a step when the setting roller comes off the protruding surface during one rotation. Was.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to apply a constant amount of coating agent to a material to be applied including a cylinder which eliminates the need for fine pressing adjustment of an application roller for supplying a coating agent and the cylinder. It is an object of the present invention to provide a coating apparatus capable of performing the above.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
A coating agent is supplied to the outer peripheral surface of the metal cylinder and the coating agent applied to the peripheral surface is transferred to a blanket cylinder. It is formed at a height that protrudes in the radial direction from the peripheral surface portion other than the attached surface portion, and on both sides in the axial direction of the peripheral surface portion, a ridge portion having substantially the same height as the coating surface portion and continuous in the circumferential direction is formed. It is characterized by having.
Further, the application surface portion and the ridge portion are formed integrally with a body portion of the metal cylindrical body.
Further, the application surface portion and the ridge portion are formed on a plate wound around the peripheral surface portion of the metal cylinder.
Further, the application surface portion is formed at a single or a plurality of locations in the axial direction on the outer peripheral surface portion of the metal cylinder.
[0007]
Further, in the coating apparatus, the cylinder in which the coating agent is supplied to the coating surface portion of the outer peripheral surface portion of the metal cylinder, and the blanket in which the coating agent is transferred to the blanket by pressing the coating surface portion of the cylinder into pressure. Torso,
An impression cylinder for supporting an object to be applied to a nip portion formed between the blanket cylinder and the nip portion formed between the blanket cylinder and the impression cylinder. It is characterized in that a coating agent is applied to the material from a blanket.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the following embodiments, a coating apparatus that applies a varnish liquid as a coating agent to a recording material after offset printing as an application material will be described as an example.
1A is a front view of the cylinder, FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A, FIG. 2A is a side view of the cylinder, and FIG. FIG. 3A is a cross-sectional view taken along the arrow BB, and FIG. 3 is an explanatory diagram showing a schematic configuration of a coating apparatus.
[0009]
First, the configuration of the coating apparatus will be described with reference to FIG. The coating device is provided as a part of the offset printing device. Describing the schematic configuration of the offset printing machine, color printing as well as monochrome printing can be performed on a recording material (paper such as business cards, cards, envelopes, plastic materials, etc.). That is, printing units (plate cylinders, blanket cylinders, impression cylinders, etc.) for supplying and printing respective color inks such as M (magenta), C (cyan), Y (yellow), and K (black) are provided in series. ing. Each printing unit performs printing for each color based on image data read for each color by an image scanner (not shown) or image data drawn on a personal computer or the like.
[0010]
An ink image is formed on the plate cylinder based on image data of the plate read by an image scanner (not shown) or plate image data drawn on a personal computer or the like, and the ink image is transferred from the plate cylinder to a blanket cylinder. The ink image is transferred to the recording material conveyed to the nip between the blanket cylinder and the impression cylinder.
[0011]
In FIG. 3, the recording material on which the ink image is formed in the printing unit is conveyed to the coating device 2 by adjusting the conveyance position by the register device 1. Hereinafter, the configuration of the coating apparatus 2 will be described. Reference numeral 3 denotes a varnish dish, which is filled with a varnish liquid as a coating agent. The varnish liquid filled in the varnish plate 3 is supplied with a certain amount of varnish liquid to the application roller 6 via the varnish supply roller 4 and the varnish feed roller 5. The application roller 6 applies the varnish liquid to the application surface of the cylinder 7. As the attaching roller 6, a roller of various materials such as a hard rubber roller and a resin roller is used. The coating surface of the cylinder 7 is pressed against the blanket cylinder 8 by a press-fitting operation to transfer the varnish liquid to the blanket. Then, a recording material, which is a material to be coated, is fed into a nip formed by a press-fitting operation between the blanket cylinder 8 and the impression cylinder 9. At this time, the varnish area transferred to the blanket is synchronized with the ink image, and the blanket cylinder 8 rotates, so that the varnish liquid is applied on the ink image. The recording material to which the varnish liquid has been applied is conveyed to the dryer by the discharge device 10.
[0012]
Next, the configuration of the cylinder 7 will be described with reference to FIGS.
In FIGS. 1A and 1B, a coating surface portion 13 to which a varnish liquid is applied from a mounting roller 6 is provided to project from an outer peripheral surface portion 12 of a cylinder 11 which is a metal cylinder. The application surface portion 13 is formed at two locations in the axial direction at a height protruding in the radial direction from the peripheral surface portion 12. What is formed in two places is formed corresponding to a recording material (for example, a card), and may be provided in a single place or in more places. The cylinder 11 is formed by extruding a metal material such as aluminum, and has a plurality of through-holes 14 formed in the axial direction to reduce the weight (see FIG. 1B).
[0013]
In FIGS. 2A and 2B, circumferentially continuous ridges (bearers) 15 having substantially the same height as the application surface 13 are formed on both ends in the axial direction of the peripheral surface 12. I have. The application surface portion 13 and the ridge portion 15 are formed by cutting the peripheral surface portion 12 of the cylinder 11 by, for example, machining.
[0014]
Since the protrusions 15 are formed in the cylinder 11 continuously in the circumferential direction, even if the attachment roller 6 is pressed by the cylinder 11, the protrusion can be pressed against the cylinder 7 at a constant interval. Therefore, a certain amount of varnish liquid can be applied to the application surface portion 13. Also, even if the pressing of the application roller 6 and the application surface portion 13 is released during one rotation of the cylinder 11, the application roller 6 does not fall into contact with the peripheral surface portion 12 so that the varnish liquid is scattered. No varnish liquid adheres to unnecessary or unnecessary parts. Therefore, since it is not necessary to adjust the pressure of the application roller 6, a constant nip can be formed between the application roller 6 and the cylinder 7 to stabilize the application amount of the varnish liquid.
[0015]
Note that the coating surface portion 13 and the ridge portion 15 may be formed on a plate wound around the peripheral surface portion of the cylinder 11. That is, a single-layer or multilayer liquid photosensitive resin layer (negative photosensitive resin) is formed on a support using a thin metal plate (eg, stainless steel, copper, zinc, aluminum, etc.), a rubber sheet, a plastic sheet or a film. May be wound around the cylinder 11 using a plate on which the coating surface portion 13 and the ridge portion 15 are formed by exposing and developing the uncured resin layer by washing and removing the plate. This eliminates the need for machining the cylinder 11 and simplifies the manufacturing process.
[0016]
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the coating agent is not limited to the varnish solution, and may be a primer solution or the like. . Of course, many modifications can be made without departing from the spirit of the law, for example, the number of coating surfaces 13 formed on the cylinder 7 is arbitrary.
[0017]
【The invention's effect】
The cylinder according to the present invention, as described above, the coating surface portion to which the coating agent is applied to the peripheral surface portion of the cylinder is formed at a height radially protruding from the peripheral surface portion other than the coating surface portion, and the peripheral surface portion On both sides in the axial direction, ridges are formed which have substantially the same height as the coating surface and are continuous in the circumferential direction, so that even if the application roller is pressed by the cylinder, it can be pressed at regular intervals. it can. Therefore, a fixed amount of coating agent can be applied to the application surface. Further, even if the contact between the application roller and the application surface is released, the application roller does not fall into contact with the peripheral surface, so that the coating agent does not scatter or adhere to unnecessary portions. Therefore, since it is not necessary to finely adjust the pressure of the application roller, a constant nip can be formed to stabilize the application amount of the coating agent.
Further, in the coating apparatus having the above-described cylinder, a constant amount of the coating agent can be always applied to the material to be applied.
[Brief description of the drawings]
FIG. 1 is a front view of a cylinder and a cross-sectional view taken along the line AA of FIG. 1 (a).
FIG. 2 is a side view of the cylinder and a cross-sectional view taken along a line BB in FIG. 2A.
FIG. 3 is an explanatory diagram showing a schematic configuration of a coating apparatus.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 register device 2 coating device 3 varnish plate 4 varnish supply roller 5 varnish feed roller 6 setting roller 7 cylinder 8 blanket cylinder 9 impression cylinder 10 discharge device 11 cylinder 12 peripheral surface part 13 coating surface part 14 through hole 15 ridge

Claims (5)

A coating agent is supplied to an outer peripheral surface portion of the metal cylinder, and in a cylinder that transfers the coating agent applied to the peripheral surface portion to a blanket cylinder,
An application surface portion to which a coating agent is applied to the peripheral surface portion is formed at a height protruding in a radial direction from a peripheral surface portion other than the application surface portion, and both sides in the axial direction of the peripheral surface portion are substantially the same as the application surface portion. A cylinder having the same height and formed with a circumferentially continuous ridge. The cylinder according to claim 1, wherein the application surface portion and the ridge portion are formed integrally with a body portion of the metal cylinder. The cylinder, wherein the application surface portion and the ridge portion are formed on a plate wound around the peripheral surface portion of the metal cylinder. 4. The cylinder according to claim 1, wherein the application surface portion is formed at a single or a plurality of positions in an axial direction on an outer peripheral surface portion of the metal cylinder. 5. The cylinder according to any one of claims 1 to 4, wherein a coating agent is supplied to a coating surface portion of an outer peripheral surface portion of the metal cylindrical body.
A blanket cylinder in which the coating agent is transferred to the blanket by pressing the coating surface portion of the cylinder,
An impression cylinder that supports the material to be applied to be fed to a nip formed between the blanket cylinder,
A coating apparatus, wherein a coating agent is applied from a blanket to the workpiece to be conveyed to a nip formed between the blanket cylinder and the impression cylinder.

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