JPS5823160A - Ultraviolet-ray irradiation device - Google Patents

Abstract

PURPOSE:To prevent any reduction of the output of ultraviolet rays, any influence of temperature, and any disorder caused by ozone by installing inside a lamp house, low pressure mercury lamps emitting ultraviolet rays, an exhaust fan connected to a duct, and an air sending fan. CONSTITUTION:A reflecting plate 2 made of highly pure aluminum, and parallel arranged one to several low pressure mercury lamps 3 primarily emitting ultraviolet rays with wavelengths of 1849Angstrom and 2537Angstrom are installed inside a lamp house 1 having a rectangular front surface. The lamp house 1 also is provided with both an exhaust fan 5 which is connected to a duct 4 located outside the lamp house 1, and an air sending fan 6 which sends a smaller amount of airflow than the above fan 5 and is opposed to the fan 5 so that air passes around the lamps 3. The whole device is fixed by providing the lamp house 1 with screw fixation holes 7. Ultraviolet rays are irradiated on an irradiated subject while shifting the subject on a belt conveyer provided under the ultraviolet-ray irradiation device.

Description

[Detailed description of the invention] The present invention relates to improvements in ultraviolet irradiation equipment.

Ultraviolet rays are used in many areas such as sterilizing air and water, photochemical reactions, etc., but in recent years, with the development of ultraviolet curing inks, they have been used for drying printing or painting on plastics, ceramics, glass, metals, printed circuits, etc. It is being used to assimilate or oxidize plastic surfaces to facilitate adhesion before printing or painting.

These ultraviolet irradiation devices are desired to be (1) small and high output in order to carry out drying and solidification reactions, oxidation reactions, etc. in a short time. (2) Depending on the oxidation reaction on the plastic surface or the ink material, the drying and solidifying effect may occur if the wavelength of ultraviolet rays is 2.
Not only the 537λ ray but also the high-energy 1849 X-ray has a greater effect and is needed. Furthermore, in order to eliminate stickiness or thermal deformation of the irradiated object due to ozone contact, an ultraviolet irradiation device with less ozone contact and less heat radiation is desired.

Conventional ultraviolet irradiation equipment consists of a lamp house, a reflector, and 253
Since it was constructed with low-pressure mercury candles that emit 7 X-rays, especially when high-output low-pressure mercury candles are used, or when a large number of these low-pressure mercury candles are installed, the temperature will rise due to the heat generated by the low-pressure mercury candles themselves. As a result, the UV output decreased over time. This relationship is shown in curve A in FIG.

In addition, the temperature of the irradiated object increases significantly due to the heat dissipation of the low-pressure mercury candle.
In particular, thin walled materials had adverse effects such as thermal deformation.

In addition, 1849 X-rays are effective in oxidation reactions on plastic surfaces, so when you try to use them, these ultraviolet rays turn oxygen into ozone, which can harm the bronchial tubes of workers and cause problems such as sticky ink. was there. For this reason, expensive ozone-free quartz glass was used as the material for the low-pressure mercury candle to prevent radiation of the 18491 rays, resulting in poor efficiency and high cost.

The present invention is to provide a novel ultraviolet irradiation device that eliminates the above-mentioned drawbacks.

The present invention will be described with reference to an embodiment shown in FIG. 1. Inside a lamp house 1 having a rectangular front surface, a high-purity aluminum reflector 2 and one to several low-pressure mercury lamps 3 that mainly emit ultraviolet rays of 1849X and 2537X are arranged. The lamp house is equipped with an exhaust fan 5 having a duct 4 placed outdoors, and an air supply fan 6 having a smaller air volume than the exhaust fan, facing each other so as to circulate air around the low-pressure mercury candle. A screw fixing hole 7 is made to fix the device, and the object to be irradiated is irradiated with ultraviolet rays while being moved by a belt conveyor provided at the bottom of the ultraviolet irradiation device (not shown).

With the above configuration, the low-pressure mercury candle is lit, and at the same time the exhaust fan and air supply fan are driven to ventilate air from the air supply fan side to the exhaust fan side, cooling the low-pressure mercury candle appropriately and reducing the low pressure. Ozone that had been converted into ozonation by the 18491 rays emitted from the mercury candle (this ozonization is significant around the low-pressure mercury candle, where the intensity of ultraviolet rays is strong) and air heated by the low-pressure mercury candle were exhausted to the outside.

In the experiment, an aluminum reflector was installed inside a lamp house with a width of 230 m, a height of 120 m, and a length of 1,300 m.
200m 110W low pressure water lamp (SUV-110-HO
(manufactured by Sen Special Light Source) are arranged in four sub-rows at 50m intervals, and the air supply fan air volume is approximately 1000 t/min, and the exhaust fan air volume is 20 t/min.
0011 minutes were provided facing each other in the length direction. As a result of performing the test at room temperature of 30℃, the decrease in UV output was about 5% of the maximum value.
It was only ~10% (Curve B in Figure 2), which yielded better results than in the case where no exhaust fan or air supply fan was provided.

In addition, the air flow rate of the exhaust fan is made larger than the air flow rate of the air supply fan, so the air flow is smooth, and the 1 radiated air from the low-pressure mercury candle
The ozone was converted into ozone by the 849 X-rays, was pushed by an air fan, sucked in by an exhaust fan, and released outdoors through a duct, so there was almost no ozone-specific pungent odor.

Ozone released outdoors reverts to harmless oxygen, so there is no risk of pollution.

In addition, the temperature radiation to the irradiated object cooled the low-pressure mercury candle through ventilation, and the high-temperature air was released outdoors, so there was no effect of thermal deformation even on thin walls.

As described above, the present invention can effectively utilize not only the 2537 X-rays emitted from a low-pressure mercury lamp but also the high-energy 18491 It has been possible to provide an excellent ultraviolet irradiation device that has no temperature effect on the irradiated object, and also has no ozone-induced damage to workers.

[Brief explanation of the drawing]

FIG. 1 is a diagram comparing the elapsed time and the intensity of ultraviolet rays between the conventional ultraviolet irradiation apparatus and the present invention. FIG. 2 is a perspective view of the present invention. 1...Lamp house 3...Low-pressure mercury candle that mainly emits ultraviolet rays with wavelengths of 1849X and 2537^ 4...Duct 5...Exhaust fan 6.・・・・・・Air fan patent special light source Co., Ltd.

Claims (1)

[Claims] Mainly 1849X, 253 inside lamp house 1
an exhaust fan 5 provided with a low-pressure mercury candle 3 that emits ultraviolet light with a wavelength of 7X, and a duct 4 disposed in the lamp house;
An ultraviolet irradiation device characterized in that an air supply fan 6 having a smaller air volume than the exhaust fan is provided to circulate around the low-pressure mercury candle.