JPS6193864A - Apparatus for irradiating ultraviolet rays - Google Patents

Abstract

PURPOSE:To enable effective and sufficient irradiation with one lamp, in curing ultraviolet curable ink or paint, by arranging an irradiation instrument at specific inclination with respect to a horizontally conveyed article to be irradiated. CONSTITUTION:An irradiation instrument 2 is arrange in a lamp house so as to incline the feed-in side thereof to a downward direction. The inclination thetaof this irradiation instrument is determined under a curing condition by the height H and circumferential length Dpi (wherein D is the max. diameter of a cylindrical article 5 to be irradiated) of the cylindrical article 5 to be irradiated and the light emitting length L of an ultraviolet lamp 4. That is, when L>=2H and L>=Dpi are satisfied, the inclination theta takes a value calculated from theta=Sin<-1> H/LX(1-0.8). By this arrangement, the side surface of the article 5 to be irradiated conveyed while rotated can be uniformly irradiated from the lower part thereof to the upper part thereof or in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an ultraviolet irradiation method for curing ultraviolet tlA curable ink or paint printed on the surface of beverage cans and non-defective cups.

Conventional Methods The curing of ultraviolet curable ink or paint is a function of the product of ultraviolet light intensity and irradiation time, but this integral value differs depending on the type of ink or paint or film thickness. Conventionally, in this type of application, the UV lamp was placed horizontally to the object to be irradiated, and the lack of UV intensity in the height direction of the object to be irradiated was compensated for by using multiple UV lamps arranged in parallel. It has been adopted.

FIGS. 3 and 4 show an example of a conventional irradiation device of this type. In the figure, reference numeral 1 denotes a lamp house, and two TerutJJX shells 2 are arranged within the lamp house. Further, the lighting OA equipment 2 is composed of a reflecting plate 3 and an ultraviolet lamp 4. An irradiated object 5 printed or coated with ultraviolet curable ink or paint is passed through the lamp house while rotating, and is irradiated with ultraviolet rays without groove shoulders 5 to be cured.

Problems to be Solved by the Invention In this way, when the height of the object to be irradiated becomes even slightly higher than the effective irradiation width of the irradiation device, the conventional method is to increase the number of lights to expand the effective irradiation width. However, depending on the height of the object to be irradiated, only a portion of the ultraviolet rays from the additional illumination equipment may be used, resulting in an irradiation setting of 5A, which is extremely uneconomical in terms of power consumption.

Means for Solving the Problem The present invention disposes the irradiation device obliquely with respect to the object to be irradiated, which is transported horizontally, so that even if the effective irradiation width of the irradiation device is slightly smaller than the irradiation height of the object to be irradiated, This makes it possible to illuminate the necessary areas without increasing the number of lights. In other words, Teru! ) The inclination θ of the I5 tool is 1" based on the curing conditions and the height of the cylindrical object to be irradiated.

It is determined by the circumference length Dπ (D is the maximum diameter of the object to be irradiated) and the lamp emission length, but the lamp emission length must be at least Dπ or more because of the need for rotation, and When considering the effective irradiation width, lamp cooling condition, etc., the inclination should be kept at 45° or less with respect to the horizontal. From these two factors, the inclination θ of the illuminator is
satisfies s≧2H and 1 and L≧[)7fl,
It can be determined by θ-3in-' H/L. In addition, taking into account factors such as deterioration of irradiation efficiency, θ=Sin
It is desirable to set it to H/LX (1-0,8). By arranging the irradiation equipment in this manner, the side surface of the object to be irradiated can be effectively irradiated with ultraviolet rays sequentially from the bottom to the top or from the top to the bottom.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, reference numeral 1 denotes a lamp house, and within the lamp house, an irradiation device 2 is disposed diagonally downward on the carry-in side. The irradiation device 2 is composed of a reflector 3 and an ultraviolet lamp 4, and is capable of rotating and conveying an irradiated object 5 such as a beverage can or food cup whose side surface is printed or coated with ultraviolet curing ink or paint. As a result, ultraviolet rays are sequentially irradiated from the bottom to the top of the irradiated object 5,
It is irradiated and hardened without any grooves before it leaves the delivery side.

Incidentally, the irradiation efficiency can be further improved by attaching a reflecting mirror to the inner wall surface of the lamp house 1 facing the irradiation device and reflecting the ultraviolet rays from the irradiation device. Also,
If the absolute value of the ultraviolet intensity is insufficient, the shortage can be covered by arranging the irradiation devices diagonally in series in the transport direction and increasing the number of lights. In addition, if there is a shortage in the height direction, the shortage will be covered by increasing the number of lights diagonally in parallel.

Effects of the invention By arranging the irradiation equipment diagonally, one lamp can effectively irradiate ultraviolet rays where two lamps would be required for horizontal irradiation.
It is possible to provide an economical ultraviolet light Q1 system that can reduce power costs and lower installation costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view showing an example of a conventional device of this type. FIG. 4 is a sectional view taken along the line B--B in FIG. 3. 1...Lamp house 2...Irradiation equipment 3...Reflector plate 4...Ultraviolet lamp 5...Irradiated object 1! λ Tsu Figure 7 Affective 4 C

Claims (1)

[Claims] In an ultraviolet irradiation device that irradiates ultraviolet rays onto the side surface of an object to be irradiated, the ultraviolet lamp is arranged at an angle, and the emission length of the ultraviolet lamp is determined relative to the height (H) and maximum diameter (D) of the object to be irradiated. The feature is that L is L≧2H and L≧Dπ, and the inclination angle θ of the ultraviolet lamp with respect to the moving surface of the irradiated object is θ=Sin^-^1H/L×(1-0.8). Ultraviolet irradiation equipment.