twenty four. What is the reason why the registration is not allowed to pull in position in the horizontal direction?
When the paper pulls out of position, it means that the pull paper pressure ball cannot pull the paper edge to the positioning rule plate when the side guide works.
(1) The side guide paper stop tongue is too low: the height of the paper side of the side guide gauge is 3 times the thickness of the paper to be printed. When the pressure paper tongue is less than 3 times the printed paper, paper pull may occur. Failure not in place.
(2) The side gauge pulling paper ball pressure is too small: the pressure of the side gauge pulls the paper ball (including the pressure of the idler pulling gauge), and is controlled by the brace spring behind it. When changing the paper with a large difference in thickness, you should replace the spring with different thickness. Thicker paper should be replaced with thicker ones when printing thick paper. In addition, the elastic spring adjustment is also very important, it is related to the size of pull paper pressure. The reason why a ship's paper is not in place is caused by the strength of bungee springs.
(3) The working distance of the sector plate at the bottom of the side gauge (low-speed machine is the pull strip) is too short: The working distance of the sector plate should be more than 15mm to meet the working requirements of the pull paper pressure ball. When less than 15mm, it should be adjusted. , No Bellow easy to cause the paper not pull the fault.
(4) Side gauge bottom fan-shaped board (low-speed machine is pull-bar) is too low: When the fan-shaped board at the bottom of the side gauge is lower than the plane of the iron plate, after the paper is pulled to press the ball, the paper will appear to retreat, which is bound to be the iron plate at this place. On the upper part of the sheet, the friction is relatively high, and the sheet is hindered, so that the sheet is not pulled. Low speed sliders will produce the same fault.
(5) The side gauge pulls the paper ball without turning: The side axis of the paper pulls the ball. Since it is under the bucket, it may drip on the water droplets, plus the pollution of paper wool and paper powder on the feeder board, so it is easier to produce Rust tightly, resulting in pressure ball does not turn, resulting in failure to pull the paper is not in place.
(6) The paper feed is too far from the side scale: When the paper sent from the paper feeder is more than 10 mm from the gauge, it is easy to produce a fault that the paper does not pull in place. This problem seems simple, but there are often problems in operation. , so we must pay enough attention to the cause: the paper is not flush, the paper is not vertical, so that the pile up and down skew.
(7) The tipping paper ball is pressed against the edge of the paper: After the paper on the paper feeding board enters the front gauge, the paper ball on the tipping paper should leave the edge of the paper, sometimes due to the difference in the cutting of the paper, causing the paper ball to be pressed against the paper. At the same time, it will increase the resistance to the sideline work, causing the paper to pull out of place.
(8) High-speed machine flat hair brush wheel is too heavy: the flat brush roller on the paper board is too heavy, which increases the resistance to the side gauge work, resulting in the paper pull not in place.
(9) High-speed machine ball pressure ball rack tripped: This is caused by inadvertent operation. The main reason is that the operator dropped the frame too much after taking the paper, causing the ball to be struck by the ball and crashed onto the paper. The resistance of the sideline work, causing the failure of the paper to pull in place.
(10) The low-speed machine jacked down prematurely: the low-speed machine jacked down prematurely, causing the side gauge to pull the paper work is not yet completed, it was hindered by the heavy pressure, causing the paper to pull not in place.
(11) The surface of the paper is too smooth: the surface of the paper is too smooth, and sometimes the paper will not be pulled out of position. Usually, when printing double-sided coated paper with a high degree of smoothness, on the one hand, the resistance due to paper weight is large, on the other hand, This phenomenon is more common on low-speed machines due to the slippage of the paper's smooth side-slips.
25. What is the reason why overprinting is not allowed in horizontal position?
When the side gauge pulls the paper ball to work, due to various reasons, the edge of the paper exceeds the rules of the side rule, resulting in inaccurate overprinting.
(1) The paper pressure on the side guide is too high: when the height of the paper side of the high-speed machine exceeds three times the height of the printed paper, the curling of the paper edge is likely to occur when the pressure ball pulls the paper, causing the paper to pull over. It is characterized by passing 1-2 lines (0.10 mm) and not exceeding too much.
(2) side gauge paper pressure ball pressure is too large: the brace spring is too tight, or the brace spring is too thick, are caused by pressure ball pressure is too large. In particular, when printing thin paper, loosen the spring or replace it with a thin spring, otherwise the pressure is too large and it can easily cause the paper to pull over the fault.
(3) Curl edge curling: When printing thin paper, the paper edge is not strong due to the thin paper, and then the vertical curling, large moisture, etc. cause the curling of the edge of the paper, which may easily cause the paper to pull over the fault ( If the edge of the paper is set under the flat conditions, the rules of curling the edge of the paper will change, and how much will be curled.
(4) Side ruler version is not parallel to the paper edge: when the side ruler works, it requires the edge of the paper to be in line with the rule when the meal is in the shape of a line instead of a dot. To achieve this requirement, we must make the rules parallel to the edge of the paper. When the regular rice is skewed, the edges of the paper come into contact with each other, and the force on the paper is concentrated at a point where the edges of the paper are easily broken or curled, resulting in failure of the paper.
(5) The regulation plate is upturned: the bottom of the low-speed machine side rule plate should be tightly seamed (without gaps) with the sheet iron plate. Sometimes the rule plate is tilted up due to poor correction or external vibration, and the bottom is voided. The edge of the paper enters this gap during the work of the gauge, causing the paper to pull through the fault.
(6) High-speed machine feeds the paper through the side guide: When the high-speed machine's sidecar is finished working, it will lift upwards. Therefore, if the paper feed is too close to the side guide, even if it exceeds the side convention, it will not stop the paper feeder. This means that the paper is stuck under the side-rule, and this failure occurs frequently and is easily lost. The main reason is that the paper is missing and there is a lack of inspection. In addition, it is also possible that the stack of sheets is tilted and no adjustment occurs during printing.
26. What are the reasons for the horizontal misregistration?
Horizontal misregistration is the phenomenon that sometimes the paper is not in place, sometimes the paper is pulled over. The reason for the occurrence of irregular overprint is not generally one, but often several kinds of faults occur at the same time.
(1) Axial oscillating shaft movement and side-rule adjustment failure: The domestic high-speed machine swing shaft end (operating surface side) is equipped with anti-locking large lock mother. As far as the general situation is concerned, there is no axial force on the oscillating shaft. In addition to the fixed oscillating connecting rod, the two ends of the wall have cam positioning and tightening, so it is unlikely to cause axial commutation, but when the cam and the roller are involved When the sub-surface is worn and linear streaks or slopes are generated, it may be caused by the connecting rod to generate axial movement, resulting in horizontal overprinting.
quasi. After the above problems arise, it can easily be treated as if the paper pressure is not enough or the pressure is too high. As a result, the pressure ball retainer spring is tightened or relaxed excessively. As a result, new problems are added to the original malady, resulting in irregular registration and inaccuracy, which further complicates the problem.
(2) Impression of the axial direction of the impression roller and the bad regulation of the side gauge: Due to the axial force transmitted by the helical gear, the impression cylinder may produce axial movement after a long time of use, resulting in inaccurate lateral overprinting. Sometimes it is accompanied by a bite and double seal.
After the above problems arise, they are often treated as sideline issues. In this way, the side gauges were not properly made, resulting in irregular overprinting of the paper. Therefore, when the horizontal overprint is not accurate, the operator should spread out a stack of papers to observe carefully the crosshairs, first find out whether there is an approximate straight line, if there is an approximate straight line, first rule board skew, linear groove, swing axis Stringing and other phenomena, and then check whether the impression roller string, can be used to check the skid rod or iron dial indicator, when checking that the impression roller really string, should be corrected.
If you want to adjust the shaft end anti-snapping device, you can tighten the lock mother, but be careful not to tighten too tightly to prevent the hot and compressive damage. The standard is to tighten the toughened mother and return it to 30°.
(3) side rule plate skew and pull paper pressure ball pressure regulation bad: side rule plate is not parallel with the paper edge, mainly through the phenomenon of passing. But often mistakenly judged to pull the ball pressure ball spring pressure is too large to adjust, resulting in the spring is too loose, but caused a small number of paper pull failure is not in place, the reaction on the print, that is, no rule overprint is not allowed.
If the spring is not allowed after adjusting the spring, the spring should be reset, and the tilt problem of the plate should be corrected.
27. What are the correct remedial measures?
Sometimes due to equipment failure or the operator's in-service inspection is not in place, overprinted products have been printed part of the time, this time should do the following processing:
If the first print is inaccurate, or the first print is the talk color, it cannot be performed in the same second print color registration. It can be remedied by overprinting the crosshair after the sorting to reduce the loss.
Overprinted reticle should be improved, not only a set of lines, can be used next to the reticle cross-line, draw a few lines every half a millimeter, and note 1,2,3,4. After the crosshairs are set in this way, simply press the crosshairs that are superimposed on the numbers to make a good impression. When printing a color, it will be simpler.
Source: PACK.CN