Third, UV coating machine type The gloss of the surface of the printing is mainly used in sheet-fed printing. The following $ coating machines are generally available for UV varnish coating.
The first is a high-efficiency roller coating machine for thick paper. It is composed of rollers rotating in the same direction. According to different combinations of rollers and different centerline angles between rollers, it can be divided into many types.
The second type is a paper gripper suitable for 80-200 g/m2 square paper. To convey paper, it has a gripper to hold the paper in the impression cylinder, intermediate drum, and paper delivery section.
The other two are the Gravure Gravure Coater and the Fabricated Flexible Sheet Facing Machine. The gravure printing machine can make the local image vivid and the coating uniform. However, the amount of coating can only be adjusted by one. As long as the number, depth, and shape of gravure lines are not changed, the coating amount cannot be increased or decreased. The flexographic coating guarantees...
After coating with any of the above coaters, the solvent is generally evaporated in a hot air oven or an infrared oven, and then cured by ultraviolet rays or directly by ultraviolet rays.
When the paper is coated with UV varnish, it can be printed first, and the varnish can be coated off-line when it is added later. This processing speed is generally 30-60 m/min. In order to increase the processing speed, online methods that use photo-oil coating at the time of printing are gradually increasing. The following three methods are mainly used.
1) offset printing blanket coating processing speed 7000-9000 sheets/hour 2) gravure rotary press final coating processing speed 100-200 m/min 3) flexographic printing press final unit and special coating machine processing Speed ​​100-200 m/min IV. Selection of UV coating varnish for paper products There are many types of UV varnish. According to the background ink type, it is divided into UV ink UV varnish, oil varnish UV varnish, and Combined UV light oil. It can also be divided into off-line UV varnish, on-line UV varnish, or both UV varnish in accordance with the method of processing.
Coating on UV inks, because the compositional structure of UV ink and UV light oil is basically the same, so overprinting, dryness, gloss, adhesion, odor, post processing suitability, rub resistance, finger resistance, Yellowing in local production can get better results.
Applying UV Varnish to the oil ink has the advantages of reducing the dusting process and improving the rubbing resistance. However, it is necessary to select the type of UV Varnish that is suitable for the base oily ink, otherwise it will affect overprinting, gloss, and dryness. Enthusiasm and so on.
When UV Varnish is used, the final processing of the Varnish should be based on the production conditions. For example, in the post-processing process, there are sizing, hot galvanized aluminum and other requirements, when the choice of UV oil, you should choose a suitable sizing, hot aluminum enamel UV Varnish. It is best to select glue and aluminum foil in advance and carry out appropriate tests. In general, the printed matter is conveyed at high speed on the box making machine or on the packaging line in the box making process, and it needs to slide without stopping. In order to impart good slidability to the printed matter, polyolefin waxes, petroleum liquid waxes, and silicon UV varnish can be added to improve the slipperiness of the print surface.
Here are some of the UV Varnish used for surface treatment of paper products produced by Japan TK TOKA, which is a world-renowned manufacturer of UV technology, as well as its uses, characteristics, and applicable coating machines.
Among them, VECTA YM-GA is an on-line, off-line type varnish used on UV inks, and UV PC-3, UV PC-O, and UV PC-K1 are UV varnish oils that can be used on oily inks on UV inks. It can also be used. UV matte Varnish differs depending on the model, both for types that can be used on oily inks, and types that can only be used on UV inks.
Fifth, the use of UV Varnish Note Viscosity: Generally controlled at about 20 seconds or less (No. 4 Zahn Cup), the printing effect is better. However, UV Varnish does not have a diluent with a low viscosity such as solvent or water, and it is difficult to adjust the viscosity during the operation. Generally, the UV Varnish viscosity is adjusted by controlling the temperature of the Varnish container.
Edition: When printing on the spot, you can use PS and water printing. The resin plate can be directly used for partial printing. (To be continued)
The first is a high-efficiency roller coating machine for thick paper. It is composed of rollers rotating in the same direction. According to different combinations of rollers and different centerline angles between rollers, it can be divided into many types.
The second type is a paper gripper suitable for 80-200 g/m2 square paper. To convey paper, it has a gripper to hold the paper in the impression cylinder, intermediate drum, and paper delivery section.
The other two are the Gravure Gravure Coater and the Fabricated Flexible Sheet Facing Machine. The gravure printing machine can make the local image vivid and the coating uniform. However, the amount of coating can only be adjusted by one. As long as the number, depth, and shape of gravure lines are not changed, the coating amount cannot be increased or decreased. The flexographic coating guarantees...
After coating with any of the above coaters, the solvent is generally evaporated in a hot air oven or an infrared oven, and then cured by ultraviolet rays or directly by ultraviolet rays.
When the paper is coated with UV varnish, it can be printed first, and the varnish can be coated off-line when it is added later. This processing speed is generally 30-60 m/min. In order to increase the processing speed, online methods that use photo-oil coating at the time of printing are gradually increasing. The following three methods are mainly used.
1) offset printing blanket coating processing speed 7000-9000 sheets/hour 2) gravure rotary press final coating processing speed 100-200 m/min 3) flexographic printing press final unit and special coating machine processing Speed ​​100-200 m/min IV. Selection of UV coating varnish for paper products There are many types of UV varnish. According to the background ink type, it is divided into UV ink UV varnish, oil varnish UV varnish, and Combined UV light oil. It can also be divided into off-line UV varnish, on-line UV varnish, or both UV varnish in accordance with the method of processing.
Coating on UV inks, because the compositional structure of UV ink and UV light oil is basically the same, so overprinting, dryness, gloss, adhesion, odor, post processing suitability, rub resistance, finger resistance, Yellowing in local production can get better results.
Applying UV Varnish to the oil ink has the advantages of reducing the dusting process and improving the rubbing resistance. However, it is necessary to select the type of UV Varnish that is suitable for the base oily ink, otherwise it will affect overprinting, gloss, and dryness. Enthusiasm and so on.
When UV Varnish is used, the final processing of the Varnish should be based on the production conditions. For example, in the post-processing process, there are sizing, hot galvanized aluminum and other requirements, when the choice of UV oil, you should choose a suitable sizing, hot aluminum enamel UV Varnish. It is best to select glue and aluminum foil in advance and carry out appropriate tests. In general, the printed matter is conveyed at high speed on the box making machine or on the packaging line in the box making process, and it needs to slide without stopping. In order to impart good slidability to the printed matter, polyolefin waxes, petroleum liquid waxes, and silicon UV varnish can be added to improve the slipperiness of the print surface.
Here are some of the UV Varnish used for surface treatment of paper products produced by Japan TK TOKA, which is a world-renowned manufacturer of UV technology, as well as its uses, characteristics, and applicable coating machines.
Among them, VECTA YM-GA is an on-line, off-line type varnish used on UV inks, and UV PC-3, UV PC-O, and UV PC-K1 are UV varnish oils that can be used on oily inks on UV inks. It can also be used. UV matte Varnish differs depending on the model, both for types that can be used on oily inks, and types that can only be used on UV inks.
Fifth, the use of UV Varnish Note Viscosity: Generally controlled at about 20 seconds or less (No. 4 Zahn Cup), the printing effect is better. However, UV Varnish does not have a diluent with a low viscosity such as solvent or water, and it is difficult to adjust the viscosity during the operation. Generally, the UV Varnish viscosity is adjusted by controlling the temperature of the Varnish container.
Edition: When printing on the spot, you can use PS and water printing. The resin plate can be directly used for partial printing. (To be continued)
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