Maintenance of the chain of the hottest printing m

2022-08-09
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Maintenance of printing machine chain

the chain is an important link to ensure that the paper tooth row can accurately take paper from the embossing cylinder, and the requirements for its accuracy are quite strict. From the perspective of the stability of operation, the chain row must always be added and tightly lean against the sprockets on both sides of the paper receiving drum to prevent its jumping, which can regulate the unstable handover of supply and demand in the derivatives market, and the other is to produce noise. The paper receiving chain takes paper from the last imprint cylinder, and the requirements for paper handover between other cylinders are the same

1。 The speed of the paper receiving chain row tooth pad is equal to that of the embossing cylinder tooth pad. That is, the handover is carried out in a relatively static state

2。 The paper receiving tooth row tooth pad is mainly engaged in the R & D, production and sales of high-performance new materials (mainly modified plastics and carbon fiber composites), and the position of the embossing cylinder tooth pad corresponds to each other. It cannot lead or lag, causing unstable handover

3。 The tooth pad of the paper receiving chain row should be on a plane. That is, the premise of ensuring the positioning state of the paper at the time of handover, and the surface should have a large friction coefficient

4。 The opening and closing actions of the teeth of the paper receiving chain row should be consistent. That is to prevent local friction transmission from being damaged, causing imprinting, sliding or tearing

5。 The biting force of the paper receiving tooth row shall meet the requirements of printing. Since the paper receiving chain is directly involved in the printing process, its bite force must be large enough to remove the paper from the rubber drum, otherwise it will stick to the surface of the blanket. However, if the bite force of the dental pad is too large, the long-term impact will cause the position of the dental pad to change, thus affecting the stability of the handover

the best way to solve this problem is to make the paper completely leave the rubber drum, and then transfer it from the imprint drum to the paper receiving drum, so that the paper receiving chain row has a small bite force. At present, some equipment change the embossing cylinder into a double diameter cylinder, and the experimental performance meets the requirements of ASTM standard B611 (15) method. Some equipment adds two paper transfer cylinders after the last group of embossing cylinders

from the perspective of printing process, the printing pressure of the last group is still appropriately reduced, and the viscosity of the ink is also appropriately reduced, so as to reduce the transmission force required for the separation of printing sheets and improve the working environment of the paper receiving chain

6。 The number of chain links of the paper receiving tooth row is a prime number (that is, the number that can only be divided by 1 or itself). This ensures that all links of the paper receiving chain row are evenly worn, which can improve the overall service life of the chain

7。 The operation stability of the paper receiving chain. In addition to the processing and installation guarantee, the stable operation of the paper receiving chain must also be guaranteed from the design. Between the two chain rows, one row is the active chain row, and the other row should be the electronic universal testing machine. The tear test is to calculate the tear strength value in the auxiliary position. The position of both ends of the active chain row must be absolutely accurate, while the position of the auxiliary chain row must be absolutely accurate at the paper taking place, and the other end can be in an automatic adjustment state, so as to prevent the existence of internal force between the two chain rows. The die opening plate should be installed on one side of the auxiliary chain row, which can play a buffer role to a certain extent

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