The printing machine is a contact exposure imaging device for making printing plates. The pressure (including atmospheric pressure and mechanical pressure) is used to make the original plate and the photosensitive plate closely fit, so that the image on the original plate can be accurately dried by photochemical reaction. Made on the photosensitive plate. The printing machine is mainly composed of a light source device, an exposure room, a vacuum chamber, an electrical part, a machine base, etc. This article will introduce you to the vacuum plate printing machine maintenance.
Prepare the work before printing. Preparation before printing is the basis for ensuring the quality of printing and printing. Therefore, before the printing work is carried out, it is necessary to carry out a complete and careful inspection of the printing machine to ensure that the appearance thereof is lubricated, flat and free of dirt, scratches and the like. In addition, it is necessary to keep the stencil of the printing machine to a certain extent, the film is free from dirt and the transparent glass plate is clean. The printing machine should be able to obtain a vacuum of 80 kPa (650 mmHg) within 60 s; the vacuum of the printing machine should not be reduced by 20 kPa (150 mmHg) 5 minutes after the power of the printing machine is turned off.
The uniformity of the light source of the printing machine is required to be above 86% (using precision measuring instruments). Use a 30% dot film film to expose a PS plate. After development, measure with a densitometer. The error between the middle and the four peripheral angles is generally less than 2%, so that it will not appear when printing large-area color blocks. Color difference.
The early printing machine control system was a single board machine control system. The parameters were displayed and set to 7-segment LED digital tube and digital buttons. Due to the high failure rate of the single-board machine system, complicated parameter setting, and poor display interface, the PLC is used to redesign the control system. Compared with the original single board machine, the PLC has flexible configuration, simple programming, and supports communication connection with the HMI, which greatly enhances the monitoring function of the device. .
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