1. What is a uv lamp?
UV lamp, also known as ultraviolet lamp, is a gas discharge lamp. Gas discharge lamps are divided into arc discharge and glow discharge. The UV lamp commonly used in UV curing is an arc discharge lamp. Its working principle is: adding a quantitative amount of high-purity mercury (mercury) to a vacuum quartz tube, and by providing a voltage difference (voltage drop) between the electrodes at both ends, an ion discharge is generated, thereby Produces ultraviolet radiation. The power of the UV lamp must meet the requirements (usually 80-120W/cm); the maximum life of the UV lamp cannot exceed 1200h, and it is generally recommended to use 1000h; the UV lamp should be replaced once every 500h, and the two UV lamps can be used alternately for a period of time. Use, one is used for 500h, and the other is used between 500 and 1000h; the lamp is cleaned and rotated counterclockwise for 1/4 turn before use.
Second, what are the uses of uv lamps
1. Low-voltage UV lamps, namely germicidal lamps, are mainly used for sterilization and disinfection. In addition, UV-B also Mainly used for ultraviolet inspection, medical treatment and so on.
2. The strong ultraviolet high-pressure mercury lamp is made of high-quality pure quartz tube, so that ultraviolet rays can penetrate to a high degree and a large amount, and the arc length/luminous length can vary from 5 cm to 300 cm. The common power is 30W to 200W per centimeter, and the ultra-high power UV lamp generally operates at 200W per centimeter or more. The effective spectrum of the lamp is between 350-450nm, the main peak is 365nm, there are more than 700 varieties, and the power ranges from 100w-25kw .UV curing is called UV Curing or UV Coating in English. UV curing is a photochemical reaction, that is, a liquid UV-irradiated curable material is printed or coated on the surface of a substrate or workpiece, and the curing process is realized by UV light irradiation. UV curing Similar to the traditional drying process, but the principle is different. The traditional drying generally forms hardening by the volatilization of the solvent in the coating material, while the UV curing crosslinking does not have solvent volatilization.
3. The metal halide lamp adds iron blending, potassium blending or other rare earth metal elements blending on the basis of mercury UV lamps containing mercury and argon. Iron-doped halogen lamps are particularly enhanced with 380hm as the highest peak. Mainly used for curing ink and paint, exposure of dry film, wet film and green solder mask. With color in screen printing and curing, especially for products with thicker coatings and drying of white and black, it has an outstanding effect.
Three, the parameter introduction of UV lamp
1. UV lamp power supply voltage, usually the voltage of UV lamp is 220V, 380V and 110V. There are many applications The voltage is 220V, which is also the voltage in line with our daily life. The power supply can stabilize the voltage and protect the UV machine.
2. The working voltage of the UV lamp, the working voltage is also called the tube pressure in the industry, and the tube pressure is the voltage at both ends of the lamp. The stability of the tube pressure determines the normal operation of the UV lamp and UV equipment.
3. The working current of the UV lamp, commonly known as the tube flow, the level of the current will directly affect the normal operation of the UV lamp.
4. The starting current of the UV lamp, the starting current is the high current at the moment of starting the UV lamp. Since the ammeter of the UV curing machine has a very large starting current at the moment of starting, the manufacturer will also choose a package with a higher standard Ammeter, the ammeter above 30A can avoid damage to the UV lamp when starting.
5. UV lamp power density, density refers to the concentration of extremely high energy per square centimeter of area.
6. The diameter of the UV lamp, according to the application, different manufacturers will consider the diameter of the lamp and the diameter of the tube when configuring the UV lamp and the UV machine, because the diameter of the tube will affect the energy of the lamp, so that the overall Poor configuration.
7. The pole distance of the UV lamp (luminous length) is simply the distance between the electrode of the lamp and the electrode. The length of the pole distance of the UV curing machine will affect the effective irradiation of the UV lamp.
Fourth, common faults and problem analysis of uv lamps
1. What is the reason for the fogging of UV lamps?
If there is fog in the tube:
(1) The problem of the quartz tube, that is, the dehydroxylation is not good.
(2) Or the exhaust is not good during the production process.
(3) The purity of the gas charged is not enough.
If there is fog on the outside of the tube, it means that the gas volatiles of UV ink and uv varnish are attached to the tube wall, which can be wiped regularly with solvents such as alcohol.
2. The main reason for UV lamp deformation, what are the adverse reactions after deformation?
The main reason for UV lamp deformation is that the temperature is too high. Slight deformation will not affect normal use, but its life will be shortened a lot. Check whether the fan is damaged or the exhaust duct is too long and the exhaust is not smooth.
3. What is the matter with the adsorption of crystals in the UV lamp tube?
In the process of UV lamp making, the quartz tube is not clean and there are impurities.
4. What’s the matter with the UV lamp deforming into a bubble and bursting?
The local temperature is too high or the wall of the quartz tube is too thin. Check whether the exhaust system is smooth.
5. What is the reason why the metal head of the UV lamp always melts and burns out?
(1) The metal lamp frame has been used for a long time, the copper frame is oxidized, the local poor contact causes the current to be too large, and the ignition causes melting.
(2) The melting of the new lamp is due to the poor contact between the metal head of the UV lamp and the lamp holder, and the virtual connection causes the ignition to melt. Check whether the copper contacts of the lamp holder are oxidized, and check whether the spring is elastic.
6. What is the reason why the UV lamp cannot be lit after a few hours of use (the lamp is intact)?
If it is a metal halide lamp, it is because the proportion of halide is not appropriate, or the output of the transformer is too low, or the tube voltage of the lamp is too high. If it is a mercury lamp, it may be due to the electrode or the inherent quality of the lamp, or the lamp has leaked.
7. What’s the matter with the blackening of both ends of the UV lamp?
The electrode powder peels off and adheres to the tube wall. For example, some domestic lamps have been used for 1 to 200 hours, which is not normal.
8. What is the reason for the sudden exposure of the UV lamp during use?
(1) The current is too large (such as a short circuit in the capacitor line).
(2) Dirt hits the wall of the tube when sucking air.
(3) Poor sealing of electrodes such as molybdenum and platinum.
9. What is the reason why the UV lamp always drops in pressure during use and cannot be recovered?
(1) Excessive exhaust air
(2) The temperature of the cold end electrode cannot rise.
(3) The electrical parameters of transformers, capacitors and lamps do not match.
(4) The network voltage is too low, causing the transformer output voltage to be too low.
10. After using the UV lamp for 300-500 hours, why is there a pattern like a hand pattern on the tube wall?
(1) This phenomenon occurs when you touch the wall of the lamp with your hands during installation.
(2) If the inside of the wall is used as a lamp, the quartz tube is not cleaned enough.
11. The current and voltage of the UV lamp are normal, but the light is not normal, dim and greenish-yellow, what is the reason?
(1) The lamp power parameter is wrong.
(2) The lamp has slow leakage.
(3) The exhaust of the lamp tube is not clean during production.
(4) The transformer configuration is too small.
12. The UV lamp can be turned on normally for the first time, but it can’t be lit again. What’s the matter?
If the capacitors and transformers are in good condition, and the lines are unblocked, and there is no bad contact (there is voltage at both ends of the lamp), the problem is the lamp itself, usually the electrode. , or the light has leaked.
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