For packaging gravure, packaging materials are used to make bags or boxes, and bags or boxes are not sized. The basic size of the package is determined according to the size, quantity, etc. of the contents, and in particular, the circumference and the length of the heart roller of the plate cylinder are determined according to the layout connection requirements. The composition of the packaging material is determined according to the contents, and the shape of the packaging is determined according to the specifications of the filler and the packaging machine of the caregiver. Substrate materials have a variety of plastic film, cardboard and so on. The inks used are also varied depending on the printability of the paper (plastic film), especially for food packaging. The reason is that the reason for the deterioration of the contents of different contents in the packaging is complicated, so there are numerous packaging materials and inks used. The package gravure produces the packaged product via the process shown in FIG.
1. Uncoiling and winding department
Double-shaft rotation is the mainstream, and there are also three-paper shaft rotation. If the axes of the double-shaft rotation device are the A-axis and the B-axis respectively, when the A-axis is unwinding, the paper core on the B-axis is removed, the new paper roll is loaded and rotated back, and the high-speed cutter is used to complete the old and new. Paper tape bonding. The installation of the paper roll is accomplished by pneumatic shafts and pneumatic clamping devices. The unwinding process is the opposite. In addition, a new high-speed cutting and rolling device aimed at reducing broke has recently been introduced. This modified type is not a laser cutting device with an energy storage device (a high price, occupying a floor). Instead, the device is used to completely wrap the tape cuts on the paper core, thereby reducing wrinkle damage caused by unwinding. Compared with the conventional devices, not only the speed is high but also the speed of the paper is cut faster than the speed of the paper strip. In particular, the tape is pressed onto the paper core by a brush, so that the paper strip is well wrapped on the paper core. on.
Plate cylinder
As mentioned earlier, after the packaging specification is confirmed, the size of the plate cylinder is determined. Recently, due to the opinion that the size of the roller is too large, companies are beginning to reduce it to a number of sizes. Basically speaking, the drum will be kept until the revision, so the saved version of the drum is not a small number. In addition, since it is necessary to store a large number of plate cylinders, in terms of flexible package printing, people do not like the high-cost, land-use plate cylinders, and more use of shaftless cylinders. For large machines such as printed cardboard, the use of large drums such as gravure printing, the use of a shaft version of the drum is often used for ease of installation.
The ink supply device includes a dip coating method for directly applying the ink of the ink tank to the plate cylinder, an ink-roller roller for transferring the ink of the ink tank to an ink-rolling roller method on the plate cylinder, and the like. The method of applying the ink roller to the highlight section has recently been adopted more. Ink roller mode also reduces residual ink.
Platen installation. Due to the use of shaftless rollers, pneumatic clamping can be used. Since the platen cylinder rolls with a rubber layer, no drive is required. To prevent the solvent from damaging the rubber, it has been the past practice to match the width of the impression cylinder rubber with the width of the substrate. In order to quickly correspond to the size of the printing material, a rotatable device is built in the unit, and 2-3 impression cylinders are built in. However, due to the improvement of rubber properties in recent years, as long as a wide impression cylinder is used, it can correspond to various widths of substrates.
Due to the small printing tension in flexible packaging, the drying oven adopts a roller bracket structure. Plastic film exits the oven through the chill roll into the next color group.
Double-sided printing is achieved by a flipping mechanism or the like. After packaging the goods in a flexible package, they can only see the printed side of the package. It is rare to see double-sided printed products. The printed content on the back is mostly monochromatic or monochromatic text for observation.
Gravure control
In recent years, it can be said that it is one of the fastest growing gravure printing machines. About 10 years ago, DC motors were used for speed control, and powder brakes, disk brakes, etc. were used for brakes. Now, AC vector motors are used, which greatly improves the tension control technology. Small tension printing, which was impossible in the past, is now available, and printing of easily stretchable plastic films such as polyethylene has also become simple. Recently, a segment-driven gravure printer with a servo motor has also been introduced.
5. Gravure printing ink
Compared with offset inks, the viscosity is very low. Because of the use of a highly volatile solvent, it dries quickly, but the concentration of the ink easily changes. In order to obtain a stable printing, it is necessary to control the ink viscosity and the like.
India. For plastic film printing, in-print printing is used to brighten the surface and protect the ink. Compared with the printing of paper, the printed color sequence is reversed and the plate-making image is reversed. The printed color sequence in India is black → blue → magenta → yellow. If it is a paper-and-plastic machine, then when the paper is changed from printing paper to printing film, all the units must change color. In addition, a positive image is seen on the plate cylinder printed in the plastic film.
Spot color. Compared with gravure printing, gravure packing has more real land masses, and it is not easy to reproduce spot colors with four colors. Therefore, spot colors are often used for printing.
Automatic register device. The distance between the printing materials in the package gravure printing machine and the drying time between the printing units is very long, and it is easy to cause tension change and expansion and contraction change. Generally, an automatic register device is installed to read the overprint marks on the printing products by the scanning head. When overprinting occurs, the registration roller is adjusted by adjusting the compensation roller between the units.
Image checker. Can automatically detect print online failures and notify the operator. In particular, the problematic part can be tagged to alert the next process. Some recent devices can use the camera to detect problematic parts and display or print them out.
Preset system
According to the data stored in the previous printing, when the printing instruction is issued again, the previous printing conditions can be easily reproduced. The set items include: 1 printing pressure; 2 blade pressure; 3 blade position; 4 printing speed; 5 compensation roller position; 6 drying temperature.
Viscosity control
The speed of the impeller in the ink can be measured or the viscosity change can be detected and the solvent can be automatically replenished according to the operation of the pneumatic diaphragm pump.
1. Uncoiling and winding department
Double-shaft rotation is the mainstream, and there are also three-paper shaft rotation. If the axes of the double-shaft rotation device are the A-axis and the B-axis respectively, when the A-axis is unwinding, the paper core on the B-axis is removed, the new paper roll is loaded and rotated back, and the high-speed cutter is used to complete the old and new. Paper tape bonding. The installation of the paper roll is accomplished by pneumatic shafts and pneumatic clamping devices. The unwinding process is the opposite. In addition, a new high-speed cutting and rolling device aimed at reducing broke has recently been introduced. This modified type is not a laser cutting device with an energy storage device (a high price, occupying a floor). Instead, the device is used to completely wrap the tape cuts on the paper core, thereby reducing wrinkle damage caused by unwinding. Compared with the conventional devices, not only the speed is high but also the speed of the paper is cut faster than the speed of the paper strip. In particular, the tape is pressed onto the paper core by a brush, so that the paper strip is well wrapped on the paper core. on.
Plate cylinder
As mentioned earlier, after the packaging specification is confirmed, the size of the plate cylinder is determined. Recently, due to the opinion that the size of the roller is too large, companies are beginning to reduce it to a number of sizes. Basically speaking, the drum will be kept until the revision, so the saved version of the drum is not a small number. In addition, since it is necessary to store a large number of plate cylinders, in terms of flexible package printing, people do not like the high-cost, land-use plate cylinders, and more use of shaftless cylinders. For large machines such as printed cardboard, the use of large drums such as gravure printing, the use of a shaft version of the drum is often used for ease of installation.
The ink supply device includes a dip coating method for directly applying the ink of the ink tank to the plate cylinder, an ink-roller roller for transferring the ink of the ink tank to an ink-rolling roller method on the plate cylinder, and the like. The method of applying the ink roller to the highlight section has recently been adopted more. Ink roller mode also reduces residual ink.
Platen installation. Due to the use of shaftless rollers, pneumatic clamping can be used. Since the platen cylinder rolls with a rubber layer, no drive is required. To prevent the solvent from damaging the rubber, it has been the past practice to match the width of the impression cylinder rubber with the width of the substrate. In order to quickly correspond to the size of the printing material, a rotatable device is built in the unit, and 2-3 impression cylinders are built in. However, due to the improvement of rubber properties in recent years, as long as a wide impression cylinder is used, it can correspond to various widths of substrates.
Due to the small printing tension in flexible packaging, the drying oven adopts a roller bracket structure. Plastic film exits the oven through the chill roll into the next color group.
Double-sided printing is achieved by a flipping mechanism or the like. After packaging the goods in a flexible package, they can only see the printed side of the package. It is rare to see double-sided printed products. The printed content on the back is mostly monochromatic or monochromatic text for observation.
Gravure control
In recent years, it can be said that it is one of the fastest growing gravure printing machines. About 10 years ago, DC motors were used for speed control, and powder brakes, disk brakes, etc. were used for brakes. Now, AC vector motors are used, which greatly improves the tension control technology. Small tension printing, which was impossible in the past, is now available, and printing of easily stretchable plastic films such as polyethylene has also become simple. Recently, a segment-driven gravure printer with a servo motor has also been introduced.
5. Gravure printing ink
Compared with offset inks, the viscosity is very low. Because of the use of a highly volatile solvent, it dries quickly, but the concentration of the ink easily changes. In order to obtain a stable printing, it is necessary to control the ink viscosity and the like.
India. For plastic film printing, in-print printing is used to brighten the surface and protect the ink. Compared with the printing of paper, the printed color sequence is reversed and the plate-making image is reversed. The printed color sequence in India is black → blue → magenta → yellow. If it is a paper-and-plastic machine, then when the paper is changed from printing paper to printing film, all the units must change color. In addition, a positive image is seen on the plate cylinder printed in the plastic film.
Spot color. Compared with gravure printing, gravure packing has more real land masses, and it is not easy to reproduce spot colors with four colors. Therefore, spot colors are often used for printing.
Automatic register device. The distance between the printing materials in the package gravure printing machine and the drying time between the printing units is very long, and it is easy to cause tension change and expansion and contraction change. Generally, an automatic register device is installed to read the overprint marks on the printing products by the scanning head. When overprinting occurs, the registration roller is adjusted by adjusting the compensation roller between the units.
Image checker. Can automatically detect print online failures and notify the operator. In particular, the problematic part can be tagged to alert the next process. Some recent devices can use the camera to detect problematic parts and display or print them out.
Preset system
According to the data stored in the previous printing, when the printing instruction is issued again, the previous printing conditions can be easily reproduced. The set items include: 1 printing pressure; 2 blade pressure; 3 blade position; 4 printing speed; 5 compensation roller position; 6 drying temperature.
Viscosity control
The speed of the impeller in the ink can be measured or the viscosity change can be detected and the solvent can be automatically replenished according to the operation of the pneumatic diaphragm pump.
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