3, flexible printing
Flexographic pre-printing, that is, corrugated cardboard facing paper, uses web paper to print using a flexographic printing machine and rewinding to form a web of facing paper, and then recoiling the printed web of facing paper onto a corrugated cardboard production line to produce corrugated cardboard. . Simply put, it is the use of printing roll paper instead of the face paper of the corrugated board production line, and the rest of the process is the same as the original. The use of pre-printed corrugated board to produce special attention, that is, it has a relatively high requirement on the cutting accuracy of the cutting device for corrugated board production line. If there is no technical modification or modification for the existing corrugated board production line in many corrugated box manufacturers in China Is not suitable for pre-printed complex tile.
There are two types of flexographic pre-printing, a unit type flexo printing press and a satellite flexo printing press.
(1) Unit type flexo printing machine
This type of printing press uses a combination of stacked flexographic printing units. There is one or two sets of printing units on each printing unit shelf. The number of printing colors can be arbitrarily combined. The form is similar to the gravure printing machine. The process flow is:
Web unwinding device → unwinding tension control system → preheating roller (to minimize the paper stretching rate) → First printing unit → Drying system → Second printing unit → Drying system → Third, fourth... Printing machine →Cooling roller→winding tension control system→winding device
The unit type flexo printing machine has the following characteristics: width of the door width, its amplitude is best equal to the width of the corrugated board production line, the widest width can reach 3600mm at present, the printing perimeter has large variability, generally the repetition circumference is at least 1200mm Above, the large printing perimeter can reach more than 1800mm or even more than 2500mm; the printing speed is fast, and the general production speed can reach 250-400m/min; it is lower than the investment of gravure printing presses and satellite type flexographic printing presses with the same number of the same specifications. About %; easy to operate, simple process; unit type flexographic printing machine overprint accuracy and product quality are better than corrugated box printing slot machine, but not as well as satellite type flexo press.
2) Satellite type flexographic printing machine
This type of printer is such that the printing units are evenly arranged around both sides of the central impression cylinder. The printing units are arranged symmetrically with even numbers, such as two-color, four-color, six-color, and eight-color. At present, there are some odd numbers, that is, a group of gravure presses or unit type flexo presses are externally attached to the host of the satellite flexo printer and used for ultraviolet varnishes or ordinary varnishes.
The process flow is:
Web unwinding device → Unwinding tension control system → Auxiliary tension roller (preheating roller) → Paper guide device (correction device) → Paper guide roller → Center impression cylinder → First color printing → Drying between colors → Second color Printing → Inter-color drying → Third, four-color ... sequentially analogy → overall drying (last drying) → cooling roll → winding tension control system → winding device.
Satellite type flexographic printing presses have the following features:
Overprint accuracy is high. The overprint accuracy of the satellite flexographic printing press is about ±0.02mm. The high precision of the satellite type flexographic printing press is mainly due to the following two points: the central impression cylinder passes through the double-walled circulating water, so that the surface temperature of the central impression cylinder is kept constant. Not constant, then the diameter of the central impression cylinder varies greatly. According to the calculation, if the circulating water temperature differs by 1°C in a central impression cylinder with a diameter of 2 meters, the diameter error of the cylinder is 4 filaments. This has a great influence on the print quality and the printing register accuracy. The second is that once the printing material enters the printing part, the printing material is conveyed through the central impression cylinder and is tightly attached to the surface of the central impression cylinder. The entire printed material did not move during the printing process and the overlay was accurate.
High printing quality. The diameter of the center impression cylinder of a satellite type flexographic printing press is very large, generally more than 1000mm, up to about 3000mm (the diameter of the center impression cylinder depends on the number of printing colors and the maximum length of the printing plate roll) The contact area with the plate roller can be considered as a facet. From the point of view of the printing process, the print quality of the round press contact is better than that of the round press print. At the same time, with the breakthrough development of printing plates, inks and anilox rollers, the cable for satellite flexographic printing can reach 1751 pi, especially the appearance of thin plates with flexible plates and the development of laser ceramic anilox rollers with high number of lines. As long as the type of material is selected correctly, the surface hardness of the plate is properly adjusted, the color separation in the plate making process, the angle of the network line, the shape of the dot, the curvature of the curve, and the positioning of the highlight and dark tone are properly understood and applied. The quality of the ink, especially the viscosity of the ink With the correct use and correct handling of the process, the quality of the printed matter can be comparable to that of gravure printing.
The printing adjustment time is short and the loss of printed materials is low. The color drying between satellite type flexographic printing machines is generally between 550 and 950mm (the size of the drying distance between the colors depends on the repeated circumference of the printing plate roller), which is more than the color between the unit type flexographic printing press and the gravure printing press. The distance is much smaller, so the raw material consumed when adjusting the overprint is significantly lower than the comparative unit-type flexo printing machine and gravure printing machine. At the same time, during the entire printing process, there are few variations in the overprinting of satellite-type flexographic printing presses and printing materials, so that the rate of rejects is very low.
Printing speed, high output. The general printing speed of satellite type flexographic printing presses can reach 200-400 m/min. Some of the specific speeds are higher.
Printing materials can be widely adapted. Satellite type flexographic printing machines have a wide range of printable materials. Paper from 28 to 700g/m2 plastic film BOPP, OPP, PP, PE, HDPE, LOPE, soluble PE, nylon, PET, PVC... Aluminum foil, thin steel sheet, webbing, tipping paper and so on. The choice of material depends on the tension control range.
With the continuous development of the market economy and the prosperity of the commodity market, more and more products are being packaged on the market. The outer packaging of goods is no longer simply to protect and modify the role of the current packaging also has the sales function and anti-counterfeiting capabilities. This puts higher requirements on the printing of corrugated cardboard.
Flexographic pre-printing, that is, corrugated cardboard facing paper, uses web paper to print using a flexographic printing machine and rewinding to form a web of facing paper, and then recoiling the printed web of facing paper onto a corrugated cardboard production line to produce corrugated cardboard. . Simply put, it is the use of printing roll paper instead of the face paper of the corrugated board production line, and the rest of the process is the same as the original. The use of pre-printed corrugated board to produce special attention, that is, it has a relatively high requirement on the cutting accuracy of the cutting device for corrugated board production line. If there is no technical modification or modification for the existing corrugated board production line in many corrugated box manufacturers in China Is not suitable for pre-printed complex tile.
There are two types of flexographic pre-printing, a unit type flexo printing press and a satellite flexo printing press.
(1) Unit type flexo printing machine
This type of printing press uses a combination of stacked flexographic printing units. There is one or two sets of printing units on each printing unit shelf. The number of printing colors can be arbitrarily combined. The form is similar to the gravure printing machine. The process flow is:
Web unwinding device → unwinding tension control system → preheating roller (to minimize the paper stretching rate) → First printing unit → Drying system → Second printing unit → Drying system → Third, fourth... Printing machine →Cooling roller→winding tension control system→winding device
The unit type flexo printing machine has the following characteristics: width of the door width, its amplitude is best equal to the width of the corrugated board production line, the widest width can reach 3600mm at present, the printing perimeter has large variability, generally the repetition circumference is at least 1200mm Above, the large printing perimeter can reach more than 1800mm or even more than 2500mm; the printing speed is fast, and the general production speed can reach 250-400m/min; it is lower than the investment of gravure printing presses and satellite type flexographic printing presses with the same number of the same specifications. About %; easy to operate, simple process; unit type flexographic printing machine overprint accuracy and product quality are better than corrugated box printing slot machine, but not as well as satellite type flexo press.
2) Satellite type flexographic printing machine
This type of printer is such that the printing units are evenly arranged around both sides of the central impression cylinder. The printing units are arranged symmetrically with even numbers, such as two-color, four-color, six-color, and eight-color. At present, there are some odd numbers, that is, a group of gravure presses or unit type flexo presses are externally attached to the host of the satellite flexo printer and used for ultraviolet varnishes or ordinary varnishes.
The process flow is:
Web unwinding device → Unwinding tension control system → Auxiliary tension roller (preheating roller) → Paper guide device (correction device) → Paper guide roller → Center impression cylinder → First color printing → Drying between colors → Second color Printing → Inter-color drying → Third, four-color ... sequentially analogy → overall drying (last drying) → cooling roll → winding tension control system → winding device.
Satellite type flexographic printing presses have the following features:
Overprint accuracy is high. The overprint accuracy of the satellite flexographic printing press is about ±0.02mm. The high precision of the satellite type flexographic printing press is mainly due to the following two points: the central impression cylinder passes through the double-walled circulating water, so that the surface temperature of the central impression cylinder is kept constant. Not constant, then the diameter of the central impression cylinder varies greatly. According to the calculation, if the circulating water temperature differs by 1°C in a central impression cylinder with a diameter of 2 meters, the diameter error of the cylinder is 4 filaments. This has a great influence on the print quality and the printing register accuracy. The second is that once the printing material enters the printing part, the printing material is conveyed through the central impression cylinder and is tightly attached to the surface of the central impression cylinder. The entire printed material did not move during the printing process and the overlay was accurate.
High printing quality. The diameter of the center impression cylinder of a satellite type flexographic printing press is very large, generally more than 1000mm, up to about 3000mm (the diameter of the center impression cylinder depends on the number of printing colors and the maximum length of the printing plate roll) The contact area with the plate roller can be considered as a facet. From the point of view of the printing process, the print quality of the round press contact is better than that of the round press print. At the same time, with the breakthrough development of printing plates, inks and anilox rollers, the cable for satellite flexographic printing can reach 1751 pi, especially the appearance of thin plates with flexible plates and the development of laser ceramic anilox rollers with high number of lines. As long as the type of material is selected correctly, the surface hardness of the plate is properly adjusted, the color separation in the plate making process, the angle of the network line, the shape of the dot, the curvature of the curve, and the positioning of the highlight and dark tone are properly understood and applied. The quality of the ink, especially the viscosity of the ink With the correct use and correct handling of the process, the quality of the printed matter can be comparable to that of gravure printing.
The printing adjustment time is short and the loss of printed materials is low. The color drying between satellite type flexographic printing machines is generally between 550 and 950mm (the size of the drying distance between the colors depends on the repeated circumference of the printing plate roller), which is more than the color between the unit type flexographic printing press and the gravure printing press. The distance is much smaller, so the raw material consumed when adjusting the overprint is significantly lower than the comparative unit-type flexo printing machine and gravure printing machine. At the same time, during the entire printing process, there are few variations in the overprinting of satellite-type flexographic printing presses and printing materials, so that the rate of rejects is very low.
Printing speed, high output. The general printing speed of satellite type flexographic printing presses can reach 200-400 m/min. Some of the specific speeds are higher.
Printing materials can be widely adapted. Satellite type flexographic printing machines have a wide range of printable materials. Paper from 28 to 700g/m2 plastic film BOPP, OPP, PP, PE, HDPE, LOPE, soluble PE, nylon, PET, PVC... Aluminum foil, thin steel sheet, webbing, tipping paper and so on. The choice of material depends on the tension control range.
With the continuous development of the market economy and the prosperity of the commodity market, more and more products are being packaged on the market. The outer packaging of goods is no longer simply to protect and modify the role of the current packaging also has the sales function and anti-counterfeiting capabilities. This puts higher requirements on the printing of corrugated cardboard.
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