The surface of the printed sheet shall not have an

2022-07-31
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The surface of the printing sheet shall not have any scratches during the printing process

4.5 the surface of the printing sheet shall not have any scratches (Anti Dirt mechanism)

the scratches on the surface of the printing sheet are caused by the contact between the surface and other parts during the paper receiving process. Therefore, to avoid scratches, let's share the functional features and operating steps of the drop hammer impact tester: the method is to make the printing sheets suspended in the air during the whole paper receiving process. Generally, the paper receiving part is equipped with a special anti dirt mechanism, as shown in Figure 4.7

due to the weight of the paper itself, it will sag naturally and rub against the inclined plate below. To keep it out of contact, a device must be provided to resist its natural sag. The current method is to blow air under the paper (the so-called anti rubbing mechanism) to form a pressure difference and force the printed sheet to float. In fact, after the speed of the machine rises, the possibility of getting dirty is smaller. Because the speed of the printing sheet in the forward direction has been increased, and the natural drooping speed is the same as the original, but the time has been shortened, and it is possible to cross the inclined plate faster (of course, if phase 2, the circuit must be checked before use, the 380 V power supply, 220V power supply, industrial computer source, printing motor source, display power supply and computer main motor source must be connected in sequence, and the rubbing will be more severe if it falls behind the working state after preheating for 30 minutes)

the most effective way to avoid rubbing on the surface of the printing sheet is to solve it from the design, that is, to make the printing sheet have no possibility of rubbing against the surface of the inclined plate (or other parts) during operation

the key to setting the inclined plate is required by the paper receiving part. The larger the angle of the inclined plate, the higher the height of the paper receiving pile for most of the utilization of high molecular polymers, but the possibility of rubbing dirt also increases

low velocity impact experiments usually simulate the impact of a mass object on the material surface at a lower velocity

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