Corrugated Box Printing: Key Points Question Answer (Part 2)

9. When the cardboard is die-cut, waste paper and cardboard will appear to be scattered, causing the phenomenon of paper slippage. What should be done?
When die-cutting, waste paper and cardboard are scattered and the phenomenon of paper slippage is called dispersal phenomenon. Severe release will affect the normal production of the company. The phenomenon of scattering is due to a variety of reasons such as improper selection of die-cutting plate-making process and elastic tape. The specific reasons and solutions are as follows:
1, the die-cut version of the elastic tape or sponge is too soft, it can cause loose plate when the paper can not be bounced smoothly, and should use high-quality elastic tape or sponge with high hardness and good elasticity.
During the die-cutting, due to the complex shape of the work or the number of aligned jobs, the number of die cuts is small, and it is easy to cause loose printing. The number of continuous dots should be increased appropriately so that the length of the job can be aligned with the paper conveying direction.
3, too early pressure plate is also caused one of the reasons for the version. After die cutting, when the moving platform descends, the paper has been ejected from the knife line by the elastic tape, but the elastic tape is generally 2-3 mm higher than the knife line. If the gripper bar starts to move, the elastic tape will still press the paper, So it's easy to make a copy.
4, the quality of die-cut cardboard will also become the cause of the scattered version. If the paperboard is poor in paper quality, the fibers are too short to be dispelled during die-cutting.


10, in the process of crushing, frequent failures and how to rule out?
(1) The height of the corrugated lining is not sufficient. The reason may be that the pressure or temperature is too low, or the moisture content of the paper is too high.
Solution: Adjust the pressure or temperature, or reduce the speed so that the paper is dry.
(2) The corrugated height is not uniform, and the lengths of both sides of the corrugated paper are fan-shaped. This is due to the poor parallelism of the corrugating roller or the uneven pressure at both ends. If the corrugated paper on the left side is shorter than the right side, the upper corrugating roll should be properly raised to the left, otherwise it is reversed.
(3) The corrugated paper is curled into a tube, mainly because the temperature difference between the upper and lower rollers is too large. The condition of the heating source in the upper and lower rollers should be checked, and one of them may be faulty and may be repaired or replaced.
(4) Corrugated paper sticks to corrugated roller surface. Excessively high roller surface temperature or moisture in the base paper can cause this phenomenon. At this point, the temperature of the roller surface should be adjusted so that the paper is dried and then pressed. If the scraper and the roller groove are not attached, they should be adjusted or replaced.


11. How to maintain and maintain the corrugating roller?
(1) Before use, check the parallelism and fastening of the corrugating roller and adjust the pressure between the rollers.
(2) Pay attention to the full lubrication of the corrugating roller when using it. Spraying a small amount of oil mist or anti-friction agent on the corrugating roller surface during production will reduce the wear between the corrugating rollers and also prevent the corrugated paper from breaking and starting.
(3) After use, remove the pressure and clean the roller surface. Do not flush high-temperature roller surfaces with water. This will deform the rollers and accelerate wear.
(4) Regular maintenance. Corrugated rollers can normally produce about 20 million meters of corrugated board. If 50,000 meters of corrugated board is produced every day, grinding and repairing will be carried out in about one year. The diameter of corrugated roller after grinding is reduced by about 1.0 mm, and the coefficient of corrugation is reduced. Increased, the amount of base paper and adhesive also increased.


12. Causes of corrugating roller wear The use of corrugating rollers is a process of constant wear. In addition to the accuracy, hardness, and abrasion resistance of the corrugating roll itself, the cause of wear is the following:

The influence of base paper and products (1) Corrugated paper sediment content. The greater the sediment content, the greater the abnormal wear of corrugating rollers.
(2) The type and weight of corrugated paper. The smaller the crucible type, the heavier the gram weight, the faster the normal wear of the corrugating roller.
(3) Frequently produced paper webs, ie wide and narrow production ratios. The more narrow-width production, the greater the wear of the corrugating roller, the easier it is to cause the corrugation roller to be concave. Therefore, if possible, the narrow width should be produced at both ends of the corrugating roller.

Equipment Impact (1) Impact of equipment operating speed. Under the same conditions, the normal wear of corrugating rollers at high speeds is faster than at low speeds.
(2) The effect of equipment rigidity quality. The rigidity of the equipment is not enough and the vibration is violent, which will cause abnormal wear of the corrugating roller.
(3) Impact of equipment processing accuracy. The processing accuracy of the equipment is not enough, causing the corrugating roll to run abnormally and causing severe wear.
(4) Insufficient accuracy of parts and transmission parts or failure of the damage causes wear of the corrugating roller due to abnormal operation.

The influence of human factors (1) The alignment of the shaft line between the rollers is not parallel, causing partial wear of the corrugating roller.
(2) Excessive pressure or unevenness overloads or unevenly wears the corrugating roller.
(3) There is no pressure relief when the corrugated roller is running, causing unnecessary friction and wear of the corrugated roller.
(4) Failure to properly lubricate the shaft of the corrugating roller causes abnormal wear on the roller surface.
(5) The foreign material bites into the surface and crushes the rubbing teeth of the corrugated roller surface.
(6) When grinding the ends of the corrugating roll with emery grinding to reduce the concave, the running-in breaks the cylindricity and corrugated type of the roll.


13, cardboard rupture (burst)
The causes and solutions:
(1) The heat of the double-sided machine is too large. (Reduce heat and increase speed)
(2) The moisture content of the facial tissue is too low. (spray, reduce warm-up)
(3) Too bad or too dry base paper pulp causes too much short fiber and reduces elongation. (Change paper)
(4) The position of the upper and lower pressure roller is not correct. (correction and adjustment of the upper and lower pressure roller position)
(5) Improper adjustment of the gap between the pinch rollers, the gap is too small, the pressure line is too deep, the pressure on the tissue paper is too large, the gap is too large, the pressure line is too light, and the tissue is forced to break through the ambassador's face paper during the bending. .
(According to the corrugated board structure and the use of materials to adjust the bite gap)


14. List of crickets in Southeast Asia:
Width MM tooth number 楞 high paper rate
A楞300 34±2 4.6±0.2 1.50-1.63
C楞300 40±2 3.6±0.2 1.36-1.57
B楞300 48±2 2.8±0.2 1.34-1.52
E楞300 86±4 1.5±0.15 1.33-1.50
F楞300 126±4 0.7±0.15 1.10-1.30

15, how to solve the conveyor belt "skid" phenomenon?
There are two main conditions for the "slip" phenomenon of the conveyor belt:

(A) "Slippery" Between Conveyor Belt and Pulley
solution:
1. Tighten the upper and lower conveyor belts;
2. Check whether the adjusting mechanism of the tight device needs to be fastened;
3. Replace or roughen the existing surface of the non-slip cover;
4, check the wear of the drive gear;
5, accurate clarity of the exact copy.

(b) "Slippery" Between Conveyor Belt and Board
Cause: The friction between the liner board and the hot plate is too large.
solution:
1. Adjust the pressure roller: First adjust the pressure roller of the hot plate, it is recommended not to lift the first six, and then lift one per interval pressure roller. In addition, check if the pressure roller in the cooling area of ​​the machine stops when there is no cardboard. If some rollers stop rotating, lower the cam (or pressure roller) under the cam or journal. This allows the pressure roller in the cooling area to be lowered, resulting in better contact between the conveyor belt and the cardboard.
2. Lubrication hot plate: If the pressure roller is not adjusted completely to solve the problem of “skid”, it is recommended to lubricate the surface of the hot plate. The surface of the hot plate can generally be coated with molybdenum disulfide containing lubricating oil or grease, not with paraffin-based lubricant, because it will be transferred to the conveyor belt, thereby reducing the permeability of the conveyor belt. In the lubrication process, do not use the method of spraying oil mist, use the brushing method, you can repeat the brushing when the machine is hot, until a film is formed on the surface of the hot plate.
3, cleaning hot plate: If the hot plate is not clean, there will be drag or large friction between the cardboard and the hot plate; lead to "skid" between the conveyor and the cardboard, the hot plate should be cleaned in time to remove the starch paste stagnated Or confetti.
4. Surface Treatment of Noodle Paper: Some post-treatments on the surface of the paper will make it sticky when heated, thus increasing the frictional resistance between the paperboard and the hotplate; some paper surfaces will become smoother than other papers and cause a conveyor belt. The friction between the board and the board is small. Generally, the frictional resistance can be increased by adjusting the pressure roller, the surface of the conveyor belt to spray water or spray steam, and adjusting the running speed.
5. Clean conveyor belt: According to the situation, use a nylon brush to brush the conveyor belt irregularly to make clear the surface of the conveyor belt with starch paste, paper scraps, etc. to keep the conveyor belt clean.


16, how to make imposition is conducive to die-cut processing When making packaging cartons, usually need to die-cut printed products. When using flat-press automatic die-cutting machine for die-cutting processing, it is necessary to break a few small holes by the edge of the knife to successfully pull the die-cut finished product out of the machine. The edge of the die-cut box is not smooth, and it will naturally affect the appearance of the product more or less. Therefore, the side of the carton where the edges of the carton will be stuck or placed in inconspicuous places should be placed on the side of the mouth as much as possible during the imposition.
For products with more than two spells, if the graphics between the two spells can be seamlessly connected, a one-size-fits-all approach should be adopted to save paper and save the cost of making die. And is conducive to clean-up after die-cutting. If the graphics between the two pieces cannot be seamlessly connected or limited by the shape of the two products, it is impossible to achieve a one-size-fits-all approach. Generally, at least 4 mm wide row cutter positions should be reserved between the two products, and Each product must have at least mm of graphic hemorrhage.


Source: China Carton Network

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