The working principle of printing machine:
Pressure is used to make the original and the photosensitive plate closely fit, so that the image on the original is precisely printed on the photosensitive plate by photochemical reaction.
Operation requirements:
1, the working environment temperature should be 0 to 40 degrees Celsius, the relative humidity should be less than 80%, the effective working surface should not have scratches, bubbles, mildew and other defects, the illuminance uniformity of the working surface should not be less than 86%.
2, in the process of work, the plate should be kept in full contact with the glass surface, the detection method is as follows: put the maximum size of the plate corresponding to the machine specifications in the printing machine, close the vacuum system, turn on the vacuum pump, use the stopwatch to measure the vacuum degree shown in the vacuum system to 80 kpa, and then turn off the power, time with the stopwatch for 5 minutes. Observe the sealing performance of the vacuum system as shown in the vacuum gauge.
3. The temperature rise of the working glass surface of the printing machine should not be greater than 20 degrees Celsius, the detection method, the exposure light source is placed in the normal working position, the point thermometer with an index value of not less than 0.5 degrees Celsius is used to measure the working glass surface temperature, and the light source is turned on for 6 minutes and turned off for 3 minutes for a period. The glass surface temperature rise is calculated by comparing the working glass surface temperature at room temperature before the printing machine is operated.
4, the exposure control system with timer printing machine repeat exposure time error should be less than 1%, detection method, use a stopwatch to measure the actual exposure of the printing machine for 5 minutes 3 times, record the actual exposure time of the printing machine, calculate the average value of 3 exposure times.
5, plate printing machine on the light source requirements, first of all should be based on the plate of the photosensitive characteristics to select the light source, because the paste film substrate and plate printing machine glass has a strong absorption of light below the wavelength of 320 nm, so the wavelength of light below 320 nm on the plate photosensitive layer can not be photosensitive efficiency, The photosensitive performance of the better version of the photosensitive range is set in the wavelength range of 320 to 450 nanometers, iodine gallium lamp is the most common and efficient light source today, its wavelength distribution in the range of 350 to 450 nanometers, effective for most of the plate photosensitive layer, this light source has a strong radiant heat, so the plate printing machine should have a good heat dissipation device.

6, the printing machine in the case of power voltage fluctuation of 10% should be able to work reliably, the working noise should be less than 70 decibels, short power circuit and protection circuit, including the frame, the insulation resistance between the wire shall not be less than 1000 ohms, the printing machine should have a reliable anti-ultraviolet device.