What is the hazard of the UV light from the printer? Is it harmful to the body to contact the printer?

Whether the ultraviolet light of the plate-printing machine is harmful to the body is still a matter of opinion. So, the printing machine has wood damage? Is it often harmful to the human body when it touches the printing machine?

People below discuss the opinions of netizens:

Netizen Insight 1: The printing machine is harmful to the human body. Because the plate-making machine relies on the efficacy of ultraviolet light, the ultraviolet light source here is far superior to the strong sunlight, which is harmful to the eyes. It is very easy to cause blindness in the eyes; the long-term is also under direct ultraviolet light. It is very easy to damage the skin, such as dermatitis such as atopic dermatitis. Therefore, the actual operation of the printer should be equipped with a polarizer.

Netizen Insight 2: The printer is a bit light in a few seconds of inactivity, but you can install a small fan next to the light, or wait a few seconds to get the plate. The most important thing is that the printing plate light is not harmful to the human body. The usual lights are all iodine wedding lights. It is a little ultraviolet light. Don’t stare at it and it will be fine. If the ultraviolet light is harmful, then go out to the sun. What should I do.

What is the name of the printing machine? The printing machine is used to make the printing plate. This type of touch-exposure imaging equipment uses working pressure (including atmospheric pressure and mechanical equipment working pressure) to make genuine and light. The inductive version is inseparable from the laminating machine, which makes it easy to accurately image the genuine image on the photo-sensitive plate according to the photochemical reaction. The key to the printing machine consists of a light source device, an exposure chamber, a vacuum chamber, a part of a household appliance, and a motor shaft.

The plate-printing machine is suitable for making such a touch-exposure imaging device for printing plates (Ps version, screen version, etc.), and using the working pressure to make the genuine and optical-sensing plates inseparable to the laminating machine, which is convenient for photochemical reactions. The genuine image is precisely sun-dried on the light-sensitive version. The printing machine can be divided into two types: single-sided printing machine and rotary two-side printing machine (also known as two-side rotary printing machine, commonly known as double-twist).

Each of the high-quality printers should consider the following regulations:

(1) The working temperature should be 0-50 °C during working, and the air humidity should be lower than 90%; the laminated glass should meet the requirements of the first grade in Gb 4871-1995. In the reasonable work, the surface layer must not have the disadvantages of scratching, foaming, mildew, etc.; the precision of the light intensity of the driving face should not be lower than 87%. The main test method is: under the condition of no dry light source, adjust the light source to the least part of all normal work, and put the illuminometer with precision above ±4% to place the working surface of the laminated glass surface. The light intensity value Li of the frame management center, the square and the management center of each side, and the light intensity of the surface of the working machine of the printing machine are measured according to the relationship A=[1-(|Li-L| max)/L]×150%. Degree, at least: A is the illumination intensity precision, Li is the illumination intensity value of each measurement point, and L is the average of the illumination intensity of 9 measurement points.

(2) In the whole process of the work, the printing plate should maintain a thorough contact with the surface layer of the laminated glass. The minimum range of the vacuum pump adjustment of the ultrafiltration device is 0-86.6 kPa (0-700 mmHg); after switching off the switching power supply of the printing machine The vacuum of the 5-minute plate printer should not be reduced by 30 kPa (130 mmHg). The inspection method is given: the larger-sized printing plate corresponding to the specification of the equipment is placed in the printing machine, the ultrafiltration device is closed, the mechanical pump is turned on, and the information displayed on the vacuum gauge in the ultrafiltration device is accurately measured by the stopwatch. It takes time for the vacuum to exceed 90 kPa (700 mmHg); then, the power is turned off, and the stopwatch is used for 5 minutes to observe the sealing characteristics of the vacuum meter as shown in the ultrafiltration device.

(3) The leakage current of the laminated glass surface in the working of the printing machine should not exceed 30 °C. Inspection method: Place the exposed light source in all normal working parts, and accurately measure the ambient temperature of the laminated glass in the working with a point temperature meter with a graduation value of not less than 0.6 °C. Turn off the light source for 6 minutes and turn off for 3 minutes for one cycle time. The circulation system works for 12 times and compares with the ambient temperature of the laminated glass in the working temperature at the previous indoor temperature in the working of the printing machine. The leakage current of the laminated glass surface is measured.

(4) Exposure automatic control system The time-lapse error of the plate-printing machine with timer should be less than ±1%. Inspection method: Accurately measure the actual exposure time of the printing machine for 5 minutes with the stopwatch, record the actual shutter speed Ti of the printing machine, and measure the average shutter speed of T times, according to the relationship δ=[1- (|Ti-T| max)/T]×150% measures the repeated exposure time error δ.

(5) The specification of the light source of the printing machine: Firstly, the light source should be selected according to the light sensing characteristics of the Ps version. The light sensing range of the Ps version is usually 290-350 nm, because the film base and the printing machine of the film are pasted. Laminated glass has a relatively clear digestion and absorption effect on light below the wavelength of 390 nm light. Therefore, the light of the following wavelengths of 390 nm can not achieve the light-sensing efficiency of the Ps-type photo-sensing layer, and the Ps version with good sensitization performance sets the optical sensing range within the optical wavelength range of 390-350 nm; the iodine gallium lamp is the most versatile nowadays. The high-efficiency light source has a wavelength of light in the range of 300-350 nm, which is reasonable for most of the light-sensing layers. This kind of light source has strong heat radiation, so the printing machine should have excellent heat pipe heat dissipation.

(6) The printing machine should work in the spectrum under the condition that the working voltage of the switching power supply fluctuates by ±12%; the noise during operation should be lower than 7540db; the short-circuit driving power supply circuit and the maintenance power supply circuit (including the motor shaft) are transmitted. The grounding resistance in the middle of the line should not be lower than 1MΩ; the printing machine should have reliable sun protection equipment.

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