Español 
Latest products
Several reasons cause overprint fluctuations
by：Lisson
2020-11-17
Several causes overprint overprint volatility fluctuations caused several reasons of
1. Electrical failure caused by overprint fluctuations
in general, gravure press alignment system electrical parts are made up of test parts, processing equipment and actuator. Any link not work properly, can cause overprint fluctuations. Therefore, to analyze the cause of the overprint fluctuations, must be familiar with overprint electrical principle of the system.
the following French ATN company intaglio printing production line, for example, to overprint electrical principle of the analysis.
in various printing unit, the plate cylinder each turn, produces a pulse, and it is produced by the printing unit encoder with 500 pulses into coding circuit board. Through coding circuit board processing, form four pulses, and was sent to the longitudinal ( Or horizontal) Alignment circuit board. Here, the four cursor on a pulse signal and the detection of a pulse signal, if the overprint deviation, alignment circuit board will output a 5 v voltage into the PLC. After the PLC processing to the stepper motor drives, pushing stepper motor movements, achieve the goal of alignment adjustment.
check fluctuations caused by electrical failure overprint, usually adopt method of hildesheim. In understanding overprint system based on the principle of electrical, check whether each related electrical original normal step by step and the circuit was clear. But for regulating a specific type of gravure press after alignment has considerable experience, can also be unconventional thinking ways, so that can more quickly find out the fault point.
2. Mechanical failure caused by overprint fluctuations
from the point of practical experience, to examine the overprint system mechanical aspects, there is no fixed method. Only after understanding of the mechanical part of gravure press and master, what are known as mechanical structure affect overprint, to find problem as soon as possible. Due to mechanical trouble, of course, 'revealed' general 'appeared' much more obvious than electrical failure, therefore, to find out the resulting overprint fluctuation is relatively easy.
, for example, embossing roller after use for a long time, the surface will appear obvious traces of wear, will affect accuracy. The thinner substrates, the greater the impact on the accuracy. In addition, if observed embossing roller up and down continuously vibration in the printing process, is a good chance that embossing roller bearing damage, the longitudinal alignment of printing products have an impact.
as again, the plate cylinder lock, there will be a small move, often cause transverse overprint occur suddenness. In addition, the paper guide roller transverse moving, stepping motor drive part of the problem, etc. , can also cause overprint fluctuations. Moreover, this kind of overprint fault, its performance are basically in the process of production from time to time appear relatively sharp and sudden overprint.
3. Fluctuations and other factors caused by overprint
in addition to the electrical and mechanical reasons, overprint fluctuation produced by the other aspects of also nots allow to ignore.
first of all, the improper operation may cause overprint fluctuations. Tension size not appropriate, for example, the device in high speed, the tape will be loose and tight, affect the vertical alignment. Again, such as, the oven temperature set too high, could lead to a paper by oven after deformation is too large, under the influence of color overprint.
second, raw materials and production environment to overprint may also be affected. Paper too loose will make the actual tension change frequently, increase operation difficulty, as a result of misregister mostly in longitudinal; Paper edge is not neat will make the paper guide system action, affect the lateral overprint. Production environment temperature and humidity condition, the paper in the deformation size has a certain influence in the process of printing. Conversion table packaging printing knowledge
1. Electrical failure caused by overprint fluctuations
in general, gravure press alignment system electrical parts are made up of test parts, processing equipment and actuator. Any link not work properly, can cause overprint fluctuations. Therefore, to analyze the cause of the overprint fluctuations, must be familiar with overprint electrical principle of the system.
the following French ATN company intaglio printing production line, for example, to overprint electrical principle of the analysis.
in various printing unit, the plate cylinder each turn, produces a pulse, and it is produced by the printing unit encoder with 500 pulses into coding circuit board. Through coding circuit board processing, form four pulses, and was sent to the longitudinal ( Or horizontal) Alignment circuit board. Here, the four cursor on a pulse signal and the detection of a pulse signal, if the overprint deviation, alignment circuit board will output a 5 v voltage into the PLC. After the PLC processing to the stepper motor drives, pushing stepper motor movements, achieve the goal of alignment adjustment.
check fluctuations caused by electrical failure overprint, usually adopt method of hildesheim. In understanding overprint system based on the principle of electrical, check whether each related electrical original normal step by step and the circuit was clear. But for regulating a specific type of gravure press after alignment has considerable experience, can also be unconventional thinking ways, so that can more quickly find out the fault point.
2. Mechanical failure caused by overprint fluctuations
from the point of practical experience, to examine the overprint system mechanical aspects, there is no fixed method. Only after understanding of the mechanical part of gravure press and master, what are known as mechanical structure affect overprint, to find problem as soon as possible. Due to mechanical trouble, of course, 'revealed' general 'appeared' much more obvious than electrical failure, therefore, to find out the resulting overprint fluctuation is relatively easy.
, for example, embossing roller after use for a long time, the surface will appear obvious traces of wear, will affect accuracy. The thinner substrates, the greater the impact on the accuracy. In addition, if observed embossing roller up and down continuously vibration in the printing process, is a good chance that embossing roller bearing damage, the longitudinal alignment of printing products have an impact.
as again, the plate cylinder lock, there will be a small move, often cause transverse overprint occur suddenness. In addition, the paper guide roller transverse moving, stepping motor drive part of the problem, etc. , can also cause overprint fluctuations. Moreover, this kind of overprint fault, its performance are basically in the process of production from time to time appear relatively sharp and sudden overprint.
3. Fluctuations and other factors caused by overprint
in addition to the electrical and mechanical reasons, overprint fluctuation produced by the other aspects of also nots allow to ignore.
first of all, the improper operation may cause overprint fluctuations. Tension size not appropriate, for example, the device in high speed, the tape will be loose and tight, affect the vertical alignment. Again, such as, the oven temperature set too high, could lead to a paper by oven after deformation is too large, under the influence of color overprint.
second, raw materials and production environment to overprint may also be affected. Paper too loose will make the actual tension change frequently, increase operation difficulty, as a result of misregister mostly in longitudinal; Paper edge is not neat will make the paper guide system action, affect the lateral overprint. Production environment temperature and humidity condition, the paper in the deformation size has a certain influence in the process of printing. Conversion table packaging printing knowledge
Custom message
