uv lamp, also known as ultraviolet lamp, is a gas discharge lamp, gas discharge lamp is divided into arc discharge and glow discharge, UV curing in the commonly used UV lamps for the arc discharge lamps, the working principle is: in a vacuum quartz tube to add a quantitative amount of high-purity mercury (mercury), through the electrodes at the two ends of the voltage difference (voltage drop) to provide, resulting in an ionic discharge, which produces ultraviolet radiation. The power of the UV lamp to meet the requirements (generally 80-120W/cm); UV lamps can not exceed the maximum life of 1200h, it is generally recommended to use 1000h; UV lamps used 500h for a change, maintenance for a period of time when the use of two UV lamps can be used alternatively, one for the use of 500h, the other one for the use of 500 a 1000h between The lamp; lamp cleaning and counterclockwise rotation 1/4 weeks before use.
Second, what are the uses of uv lamps
1, low-pressure UV lamps that germicidal lamps are mainly used for sterilization, in addition to UV-B is also mainly used for ultraviolet testing, medical treatment.
2, strong ultraviolet high-pressure mercury lamps made of high-quality pure quartz tubing, so that the ultraviolet light can be a high degree and a large number of penetration, its arc length / light-emitting length can be from 5 cm to 300 cm ranging from the common power of 30W to 200W per centimeter, the ultra-high-power UV lamps are generally operated in the 200W per centimeter or more, the light spectrum of the effective range between 350-450nm, the main peak is 365nm. Between the effective range of the light spectrum in the 350-450nm, the main wave peak of 365nm, there are more than 700 varieties, the power from 100w-25kw. UV curing in English, known as UVCuring or UVCoating, UV curing is a photochemical reaction, that is, liquid UV irradiation can be curable material by printing or coating to the substrate or workpiece surface, by UV light irradiation to achieve the process of hardening, UV curing and traditional drying processes UV curing and traditional drying process is similar, but the principle is different, the traditional drying generally with the help of solvent evaporation in the coated material to form the hardening, and UV curing crosslinking is no solvent evaporation.
3, metal halide lamps containing mercury and argon mercury UV lamps based on the addition of iron doped, potassium doped or other rare earth metals doped. Iron doped halogen lamps especially enhanced 380hm as the highest peak. Mainly suitable for ink and paint curing, dry and wet film, green solder resist exposure. In screen printing and curing with color, especially thicker coating products and white, black drying has outstanding results.
Three, UV lamp parameters introduced
1, UV lamp power supply voltage, usually UV lamp voltage 220V, 380V and 110V. more applications for 220V, which is also in line with the voltage of our daily life, the power supply can stabilize the voltage, the UV machine to play a role in protecting.
2, UV lamp operating voltage, operating voltage in the industry is also known as the tube pressure, tube pressure is the voltage at both ends of the lamp. The stability of the tube pressure determines the UV lamp and UV equipment for normal operation.
3, UV lamp working current, commonly known as the tube current, the current level will directly affect the normal operation of the UV lamp.
4, UV lamp start-up current, start-up current is to start the UV lamp when the instant high current, due to the UV curing machine ammeter start-up instant start-up current is very large, the manufacturer will also choose a higher standard supporting ammeter, 30A or more ammeter can be avoided when the start-up of the damage to the UV lamp.
5, UV lamp power density, density refers to the area per square centimeter can concentrate very high energy.
6, UV lamp diameter, according to the use of different manufacturers of UV lamps and UV machine configuration will take into account the diameter of the lamp, the size of the tube, because the size of the tube will be the energy of the lamp, so that the overall configuration is not good.
7, UV lamp pole distance (light-emitting long), simply put is the distance between the lamp electrode and the electrode, UV light-setting machine pole distance length will affect the effective irradiation of UV lamps.
Four, uv lamps of common failures and problem analysis
1, UV lamps have a foggy produce what is the reason?
If the tube is foggy is:
(1) quartz tube problems, that is, bad dehydroxylation.
(2) or in the production process exhaust bad.
(3) Then the gas is not pure enough.
If there is a fog outside the tube is: UV ink, uv varnish gas volatiles adhering to the wall of the tube, can be regularly wiped with alcohol and other solvents.
2, the main reason for the deformation of UV lamps, deformation after what adverse reaction?
The main reason for the deformation of the UV lamp is the high temperature, slight deformation does not affect the normal use, but the life will be shortened a lot of serious deformation will make the lamp on one side of the tube wall thinning and rupture. Check whether the fan is damaged or the exhaust pipe is too long to cause poor exhaust.
3, UV lamps have a piece of crystal adsorption is how?
UV lamp making process, quartz tube cleaning impurities.
4, UV lamps become bubble-shaped, burst how?
It is the local temperature is too high, or because the quartz tube wall is partially too thin, check whether the exhaust system is smooth.
5, UV lamp metal head is always melting burned out what is the reason?
(1) metal lamp holder for a long time, the copper frame oxidation, poor local contact resulting in excessive current, fire caused by melting.
(2) the new lamp melting is because the UV lamp metal head and lamp frame contact is poor, false connection caused by the fire melting. Check whether the copper contact of the lamp holder is oxidized, check whether the spring is elastic.
6, UV lamp use a few hours can not be lit (lamp intact) what is the reason?
If it is a metal halide lamp is because the halide ratio is not appropriate, or transformer output is too low, or the lamp tube pressure is too high. If it is a mercury lamp, it may be because of the electrode or the inner quality of the lamp, or the lamp has been leaking.
7, UV lamps at both ends of the black is how?
It is the electrode powder flaking, attached to the tube wall, such as some domestic lamps to one to two hundred hours this situation is not normal.
8, UV lamp in the use of sudden exposure to crack what is the reason?
(1) excessive current (such as capacitor line short circuit).
(2) suction air when there is dirt hit on the wall of the tube.
(3) Electrode molybdenum-platinum and other poor sealing.
9, UV lamp in the use of the process is always pressure drop, can not go back up is how?
(1) Exhaust air is too large
(2) The cold end of the electrode temperature can not come up.
(3) The electrical parameters of the transformer, capacitor and lamp do not match.
(4) The network voltage is too low, resulting in low output voltage of the transformer.
10, UV lamps use 300-500 hours, why in the tube wall on the phenomenon of hand lines like patterns?
(1) When installing the lamp with a hand touching the wall will be used into this phenomenon.
(2) the wall of the inner side is to do when the lamp, quartz tube cleaning is not clean enough.
11, UV lamp current and voltage are normal, but the light is not normal, dark greenish-yellow is the reason?
(1) lamp power parameters are not correct.
(2) The lamp has a slow leakage phenomenon.
(3) The lamp is not cleanly vented during production.
(4) The transformer is small.
12, UV lamps can be lit for the first time normal shutdown, but later never light up what is going on?
If the capacitor, transformer are intact, and the line is smooth, there is no poor contact phenomenon (voltage at both ends of the lamp) in the case of the lamp itself is the problem, generally electrode problems, or the lamp has been leaking.