The hottest packaging printing technology

2022-08-15
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Packaging and printing technology (Part 1)

tensile testing machine often uses morphemes that are specified by our manufacturer.

how does the phenomenon of jumping and collapsing occur in the production of paperboard? What are the solutions

answer: the qualified corrugated board production process requires that the corrugated paper be tightly attached to the lower corrugated roll after being rolled by the upper and lower corrugated rolls, and then separated from the roll surface after being pasted at the contact between the pressure roll and the lower corrugated roll. In this process, once the core paper is separated from the roll surface, there will be jumping and collapsing. Therefore, finding out the reason why the core paper is separated from the roller surface is the key to solve the problem of jumping and collapsing

the following are the reasons why the core paper is separated from the roll surface and the solutions. 76.0% of the total output of the global aerospace composite market comes from the top three company law:

insufficient tension: due to insufficient tension of the core paper entering the tile machine, the paper surface is not stiff, resulting in the core paper after rolling out of the roll surface. Solution: according to the tightness of the base paper, the size of the paper roll, the speed and other conditions, adjust the tension regulator of the base paper rack and increase the tension in time. It is better to choose the base paper holder with constant tension control system to realize automatic control

the ellipse of the paper roll is too large: the tension of the core paper changes periodically, causing the core paper to separate from the roll surface after rolling. Solution: adjust the tension adjuster of the base paper holder in time and increase the tension according to the tightness of the base paper, the size of the paper roll, the speed and so on. It is better to choose the base paper holder with constant tension control system to realize automatic control

the distance between the edge of the paper web and the air extraction slot (or guide claw) is too large: the adsorption force is the best when the distance between the edge of the paper web and the air extraction slot (or guide claw) is within 10-15 mm; If it is larger than 20mm, its adsorption force and speed will be reduced, which will cause the rolled core paper to separate from the roll surface. General manufacturers do not understand this phenomenon enough, which should be paid attention to. Solution: according to the specification of the paper web, adjust the horizontal position of the paper roll in time, so that the edge of the paper web is within 10-15 mm from the air extraction slot (or guide claw); Add air extraction slots (or guide claws) on both sides of the lower pad roll (i.e. the edge of common paper web specifications) to facilitate the increase of adsorption force on the paperboard

how to keep the color of corrugated board ink printing consistent and the position accurate

answer: the main reason for the inconsistency of printing color depth and "out of print" is the poor control of ink viscosity; Ink transfer status is unstable; The paper feeding state is unstable. Poor flatness of paperboard is also an important reason. Therefore, the following points must be achieved:

1 Keep the ink viscosity stable. Ink viscosity is the main index that needs to be controlled in corrugated board printing, and it is one of the main factors that affect the printing color. Due to the volatilization of ink solvent in the printing process, the base viscosity will increase. In order to maintain the stability of ink viscosity, ink should be added every 0.5-1 hour to stabilize, with the addition amount of 1% - 2%

2. Keep the ink transfer volume stable. Therefore, the printing speed must be balanced and stable. Because the printing speed is related to the ink transfer state, it must operate in a balanced manner, not fast or slow. It is also necessary to keep a balanced paper passing, and the phenomenon of paper feeding between sheets cannot occur. Only in this way can the ink printer have a stable ink transfer state, which plays an important role in maintaining the stability of ink printing color

3. Keep the paper feeding state stable. In addition to the stable running speed of the printing machine, the landing point of manual paper feeding should be fixed. The paperboard with poor flatness should be properly handled. The energy used accounts for about 12% of the total energy consumption of the national economy. For example, one (or both sides) is folded back along the transverse pressing line of the paperboard; Press 2 by hand Adjust the machine conditions according to the size of all finished products that are too large or too small The paper guide clearance should be consistent These are important links related to maintaining the stable operation of paperboard, and they are also important methods for the phenomenon of "version running"

4. Keep the printing equipment in good condition. It should be emphasized that keeping the embossing roller and printing plate clean is directly related to the printing effect. The roller is related to the ink transfer performance, and the printing plate is related to the clarity of printed words and patterns

how to remedy the bottom color leakage caused by problems such as paper eyebrows during full page printing

answer: there may be several reasons for the leakage of background color:

(1) quick drying: quick drying of ink can lead to poor ink transfer and the leakage of background color. It can be remedied by increasing pH value or adding some slow drying agent

(2) too low viscosity: too sticky ink will also lead to poor transfer effect and background color leakage. Adding new ink or resin liquid can improve the viscosity of ink

(3) paper eyebrow: due to the poor flatness of the paper, the ink transfer will be uneven, resulting in background color leakage, which can be improved by improving the printing viscosity, increasing the printing pressure or using a thicker wrinkle roller

(4) printing pressure: too small printing pressure will lead to ink transfer efficiency and background color leakage, which can be improved by appropriately increasing the printing pressure

(5) poor compatibility of ink: poor compatibility of ink with paper or printing plate materials will also lead to poor transfer of ink and background color leakage. Select the appropriate ink according to the paper and printing plate materials

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