JPH09206653A - Ultraviolet light irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispose inexpensive ultraviolet light irradiation device in a narrow space and stabilize the irradiation dose. SOLUTION: An ultraviolet lamp 21 is stored in a case 28, and one shutter plate 22 in the state of opening one side is installed on the front of the ultraviolet lamp 21. A reflection face 22a is formed on the rear face of the shutter plate 22 to reflect ultraviolet light from the ultraviolet lamp 21, and introduced onto the surface of a material to be irradiated through an opening 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation device for irradiating an object to be irradiated such as ultraviolet ink with ultraviolet rays.

[0002]

2. Description of the Related Art Conventionally, an ultraviolet irradiation device has been used for curing resin, paint, ink, adhesive or the like.

FIG. 5 is a cross-sectional structural view of a conventional shutter type ultraviolet irradiation device. This ultraviolet irradiation device 10 is
An ultraviolet lamp 11, reflection plates 12 and 13 and a pair of shutter plates 14 and 15 are provided. The pair of shutter plates 14 and 15 are formed in a so-called double door structure that can be opened and closed from the center to both sides.
By opening and closing 15, ultraviolet rays are irradiated and blocked.

In the ultraviolet irradiation device 10, since the two shutter plates 14 and 15 have a double-door structure, a mechanism for driving both shutter plates 14 and 15 is required, and the ultraviolet irradiation device becomes relatively large. Therefore, a relatively large arrangement space is required.

By the way, in the printing apparatus, an ultraviolet irradiation device is attached for curing the ultraviolet curable ink (ultraviolet ink) supplied to the surface of the printing paper.
For example, in the case of a multi-color printing device, a plurality of printing units are arranged at a predetermined interval along the conveyance path of printing paper. An ultraviolet irradiation device is installed between the plurality of printing units.

However, when the intervals between the plurality of printing units are narrow, it is difficult to arrange the shutter type ultraviolet irradiation device. Therefore, an instant lighting type ultraviolet irradiation device is used in such a small space. The instant lighting type ultraviolet irradiation device irradiates and blocks ultraviolet rays by turning on and off the ultraviolet lamp. Since this instant lighting type ultraviolet irradiation device does not have a shutter structure, the device is small and can be arranged in a narrow space.

[0007]

However, in the instant lighting type ultraviolet irradiation device, since the ultraviolet lamp is repeatedly turned on and off, the life of the ultraviolet lamp is longer than that of the ultraviolet lamp of the ultraviolet irradiation device having the shutter structure. Is as short as about half. In addition, since a highly reliable ballast is required, the ultraviolet irradiation device becomes expensive, resulting in an increase in running cost.

Further, when the ultraviolet lamp is turned on during the irradiation of ultraviolet rays, a high voltage is instantly applied and excessive ultraviolet rays are emitted. At this time, if an excessive amount of light is applied to the highly reactive object to be irradiated, there is a problem that a defect occurs in that part.

An object of the present invention is to provide an ultraviolet irradiation device which is inexpensive, can be arranged in a narrow space, and has a stable irradiation light amount.

[0010]

In the ultraviolet irradiating device according to the first invention, an ultraviolet lamp is housed in a case having an opening, and ultraviolet rays from the ultraviolet lamp are shielded near the opening of the case. One shutter plate is attached so as to be opened one-sided, and an ultraviolet reflecting portion is provided on the surface side of the shutter plate facing the ultraviolet lamp when light is shielded.

The ultraviolet irradiating device according to the second invention is an ultraviolet irradiating device arranged between at least two printing units for supplying the ultraviolet ink onto the surface of the printing paper wound around the outer periphery of the cylindrical impression cylinder, The UV lamp is housed in a case that has an opening, and one shutter plate that shields the UV rays from the UV lamp is attached near the opening of the case so that it is a single-sided shutter. An ultraviolet reflecting portion is provided on the surface side of the plate.

The ultraviolet irradiating device according to the third invention is the first
Alternatively, in the configuration of the ultraviolet irradiation device according to the second invention, the opening width of the opening of the case is 3 times the outer diameter of the ultraviolet lamp.
It is formed in less than double.

In the ultraviolet irradiating device according to the first to third aspects of the invention, the width of the ultraviolet irradiating device can be narrowed as compared with the double-opening structure by providing the one shutter plate so as to be opened one side. it can. Moreover, since the width of the opening for irradiating ultraviolet rays decreases less than the width of the ultraviolet irradiation device decreases, the entire ultraviolet irradiation device can be downsized and can be placed in a narrow space, and the print drying can be performed. No deterioration in performance occurs.

Further, since the reflecting portion is provided on the surface of the shutter plate facing the ultraviolet lamp, the ultraviolet light reaching the shutter plate is reflected toward the surface of the object to be irradiated, and the ultraviolet light scattered or absorbed by the shutter plate is reflected. It is possible to prevent and increase the amount of ultraviolet rays reaching the surface of the object to be irradiated. Thereby, the irradiation efficiency of the ultraviolet irradiation device can be improved.

Particularly, in the ultraviolet irradiating device according to the second aspect of the present invention, since the entire device is downsized, it can be arranged between printing units having a small arrangement space. Therefore, the price and running cost of the printing apparatus can be reduced by using the ultraviolet irradiation apparatus according to the present invention instead of the expensive instantaneous lighting type ultraviolet irradiation apparatus as in the prior art.

Particularly, in the ultraviolet irradiating device according to the third aspect of the invention, the shape of the reflecting portion of the shutter plate attached to the opening is formed by forming the opening width of the case to be 3 times or less the outer diameter of the ultraviolet lamp. It can be optimized to increase the collection rate of ultraviolet rays.

[0017]

1 is a block diagram of a printing apparatus using an ultraviolet irradiation device according to an embodiment of the present invention.

In FIG. 1, printing paper 2 is provided on the outer periphery of the impression cylinder 1.
And the printing paper 2 is wound by the rotation of the impression cylinder 1.
Are conveyed in the longitudinal direction. Further, four printing units 3 to 6 are arranged around the impression cylinder 1. The printing unit 3 is arranged near the printing unit 4, and the printing unit 5 is arranged near the printing unit 6.

Four ultraviolet irradiation devices 10 and 20 are arranged between the printing units 3 to 6, respectively. As the ultraviolet irradiation device, two types of devices are used depending on the arrangement space between the printing units. That is, between the printing unit 3 and the printing unit 4 which are arranged closely, and similarly, the printing unit 5 and the printing unit 6 which are arranged closely.
Between this and the ultraviolet irradiation device 20 according to the embodiment of the present invention.
Is arranged. Further, between the printing unit 4 and the printing unit 5 arranged sufficiently apart, and between the printing unit 6 and the printing unit 3 similarly arranged sufficiently apart, the conventional shutter type shown in FIG. The ultraviolet irradiation device is installed.

FIG. 2 is a front sectional view of the ultraviolet irradiation device 20 according to the embodiment of the present invention, and FIG. 3 is a side sectional view thereof. In the ultraviolet irradiation device 20 shown in FIGS. 2 and 3, the hollow box-shaped case 28 has an opening 28a for irradiating the irradiation target with ultraviolet rays.

Inside the case 28, a rod-shaped ultraviolet lamp 21 is housed. A pair of reflecting mirrors 27, 27 is arranged on the rear surface side of the ultraviolet lamp 21. Further, one shutter plate 22 is arranged in front of the ultraviolet lamp 21 (direction of irradiation of ultraviolet rays). One end of the shutter plate 22 is attached so as to be rotatable about a rotation shaft 22b provided near the wall surface of the case 28. The pulley 26 fixed to the rotating shaft 22b is connected to the tension pulley 25 and the motor 23 via the chain 24. Further, the motor 23 is configured to be rotatable in the forward and reverse directions. Therefore, the rotation of the motor 23 causes the shutter plate 22 to rotate from a position where the opening 28a of the case 28 is opened to a position where the opening 28a is closed. By this rotation operation, the ultraviolet light emitted from the ultraviolet lamp 21 is applied to the object to be irradiated, and the ultraviolet light is blocked.

In the ultraviolet irradiation device having such a single-opening shutter structure, the opening / closing structure of the shutter plate can be simplified as compared with the double-opening shutter structure, so that the entire ultraviolet irradiation device can be downsized and the cost of the device can be reduced. Can be made.

A reflecting surface 22a for reflecting ultraviolet rays is formed on the back surface of the shutter plate 22. FIG. 4 is a diagram for explaining the operation of the reflecting surface 22a of the shutter plate 22. During the curing process by UV irradiation,
The shutter plate 22 is in the open position as shown. Part of the ultraviolet light emitted from the ultraviolet lamp 21 advances toward the shutter plate 22 side.

In this case, if the reflecting surface 22a is not formed on the back surface of the shutter plate 22, the ultraviolet light is scattered or absorbed by the back surface of the shutter plate 22 and reaches the surface of the printing paper 2 which is the object to be irradiated. The amount decreases.

On the other hand, in this embodiment, the reflecting surface 22a is provided on the back surface of the shutter plate 22.
The ultraviolet rays 29 that have reached 2a are reflected and guided to the surface of the printing paper 2. Moreover, by giving an appropriate curvature to the surface of the reflecting surface 22a, the condensing rate of the ultraviolet rays 29 reaching the reflecting surface 22a is increased. For example, if the opening width of the opening 28a is larger than the outer diameter of the ultraviolet lamp 21, the reflecting surface 22
The smaller the curvature of a, the better the light collection rate. However, on the other hand, if the width of the opening 28a is large, the shutter plate 2
The width of 2 also becomes large, and it becomes difficult to form a curved surface having a small curvature on the reflecting surface 22a having a large width. Therefore,
In this embodiment, the opening width of the opening 28a is set to the ultraviolet lamp 2
The outer diameter of 1 is 3 times or less, and an optimum curved surface is formed on the reflecting surface 22a to improve the light collection rate.

With such a structure of the reflecting surface 22a, the printing paper 2 can be printed without increasing the output of the ultraviolet lamp 21.
It is possible to secure a sufficient amount of light for exposing and curing the ultraviolet ink on the surface.

The ultraviolet irradiating device having the above-mentioned one-sided shutter is provided with the ultraviolet lamp 2 while the printing device is operating.
1 is always on. During irradiation of ultraviolet rays, the shutter plate 22 is opened and the ultraviolet lamp 21
Is set to an output state necessary for curing the ultraviolet ink on the surface of the printing paper 2 without causing a defect in the irradiated object.

When ultraviolet rays are blocked, the shutter plate 22 is closed and the output of the ultraviolet lamp 21 is suppressed. Thus, in the ultraviolet irradiation device of the present embodiment, since the ultraviolet lamp is used in a state in which the ultraviolet lamp is always lit as described above, it is excessive at the start of lighting, which is a problem in the conventional instantaneous lighting type ultraviolet irradiation device. It is possible to prevent the occurrence of defects due to ultraviolet irradiation.

In the above example, the ultraviolet irradiation device having the single-sided shutter plate is used as the ultraviolet irradiation device 20 arranged between the printing units having a small arrangement space, but the invention is not limited to this. It can also be used in place of the conventional ultraviolet irradiation device 10 arranged between printing units having a sufficient arrangement space.

The ultraviolet irradiating device having a single-opening shutter structure according to the present invention can be used not only for curing the ultraviolet ink of the printing apparatus but also for curing the resin, paint, or adhesive.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a printing device using an ultraviolet irradiation device according to an embodiment of the present invention.

FIG. 2 is a front sectional view of an ultraviolet irradiation device according to an embodiment of the present invention.

FIG. 3 is a side sectional view of an ultraviolet irradiation device according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining an action of a reflecting surface of a shutter plate.

FIG. 5 is a sectional structural view of a conventional ultraviolet irradiation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impression cylinder 2 Printing paper 3-6 Printing unit 10 Ultraviolet irradiation device (double opening shutter) 20 Ultraviolet irradiation device (single opening shutter) 21 Ultraviolet lamp 22 Shutter plate 22a Reflecting surface 27 Reflecting plate 28 Case 28a Opening

Claims (3)

[Claims] 1. An ultraviolet lamp is housed in a case having an opening, and one shutter plate for shielding the ultraviolet rays from the ultraviolet lamp is attached in the vicinity of the opening of the case so as to open one side, An ultraviolet irradiating device, characterized in that the ultraviolet light reflector is provided on the surface side of the shutter plate facing the ultraviolet lamp when light is shielded. 2. An ultraviolet irradiation device arranged between at least two printing units for supplying ultraviolet ink to the surface of a printing paper wrapped around the outer circumference of a cylindrical impression cylinder, wherein the ultraviolet lamp is provided in a case having an opening. And a shutter plate that shields the ultraviolet rays from the ultraviolet lamp in the vicinity of the opening of the case so that the shutter plate is opened so that the shutter plate faces the ultraviolet lamp when the light is blocked An ultraviolet irradiating device, characterized in that the above-mentioned ultraviolet ray reflecting portion is provided in the. 3. The ultraviolet irradiation device according to claim 1, wherein an opening width of the opening of the case is formed to be 3 times or less of an outer diameter of the ultraviolet lamp.