1. Common faults and remedies of gravure gold and silver ink There are the following common faults in gravure gold and silver ink. The exclusion method is listed after each fault cause.
1 Adhesive backing, bonding plastic film printing gold and silver ink on the back after the dirty, in serious tear between the film will not open, or will stick out of the background graphics. The main reasons for this phenomenon are the slow dryness of the link material, or the nature of the link material in the bottom ink and the gold/silver ink link material; the ambient temperature is too high, the printing speed is too fast, the pressure is too high, and the far-infrared light is insufficient; It is also sometimes the PE resin film itself is tacky.
The exclusion method is to change the formula of gold oil, can use the formula of polyamide oil: polyamide resin 40% to 50%, isopropyl alcohol 25% to 27%, xylene 25% to 28%, and add the same amount of Gold powder. At the same time reduce the operating environment temperature, slow down the printing speed, adjust the pressure, strengthen the air volume and far infrared light. If the resin itself is sticky, replace the resin.
2 The fastness of the peeling ink layer is extremely poor, and the gold and silver powder particles can easily fall off. The reason is that using a single solvent to directly harmonize gold and silver powders, lacks the necessary viscosity. Can be solved by changing the link material.
3 burrs, spots phenomenon is a large area of ​​part of the speckle pattern, the gloss is very poor; part of the printing ink is the edge of the graphic diffusion. The reason is that the printing is too light, the solvent is too much, the leveling property is poor, the pattern is too deep, and the plastic film is electrostatically accumulated. The method of elimination is to control the amount of solvent and apply anti-static treatment to the plastic film, and the pattern should not be too deep when making the plate.
(4) The reason for the poorly-printed part of the escape line is that it is unclear or the ink cannot be printed. The reason is that the linking material dries too fast and the printing speed is too slow. A large area of ​​gold and silver ink blocks and thin lines coexist in gold. The exclusion method is to adjust butanol, adjust the printing speed, and divide the large-area color and thin lines into two plates.
The five-color gray gold and silver ink is dark and dull. The reason is that the reconciliation time is too long. It is oxidized or eroded by acids, alkalis, sulfur and other chemical substances, and is colored with other inks. The method of elimination is that gold ink is used with the adjustment and the ink pump, pipe, ink tank and printing plate are cleaned on time to prevent cross-coloring. Once the color is strung, it is replaced immediately.
6 Paste Gold and silver inks have dried in the printing plate texture before they have been transferred to the film surface. The reason is that the printing plate has not been cleaned in time, so that the residual ink is solidified in the pattern and gradually accumulated, so that patterns, lime sand and the like are incorporated into the ink. The exclusion method is to clean the plate at any time and pay attention to the hygiene of the operating environment.
2. The type of gravure:
Gravure has two major categories: gravure and gravure. Photogravure is further divided into traditional gravure (ie, carbon paper or photogravure) and photographic gravure. The engraving gravure is divided into hand carving, mechanical carving and electronic engraving. Currently used are gravure, photographic gravure and electronic engraving gravure.
1 gravure is on the dichromate sensitized carbon paper, first drying gravure network, and then drying continuously adjusted positive image, and then transfer the carbon paper image onto the roller, through the development, Fill plates and corrodes to make plates.
(2) Photogravure Gravure plate printing method applies direct emulsion coating on roller by spraying method or slip ring method, directly exposing printing plate with positive plate added with concave net, then developing, filling plate, and etching to obtain printing plate. .
1 Adhesive backing, bonding plastic film printing gold and silver ink on the back after the dirty, in serious tear between the film will not open, or will stick out of the background graphics. The main reasons for this phenomenon are the slow dryness of the link material, or the nature of the link material in the bottom ink and the gold/silver ink link material; the ambient temperature is too high, the printing speed is too fast, the pressure is too high, and the far-infrared light is insufficient; It is also sometimes the PE resin film itself is tacky.
The exclusion method is to change the formula of gold oil, can use the formula of polyamide oil: polyamide resin 40% to 50%, isopropyl alcohol 25% to 27%, xylene 25% to 28%, and add the same amount of Gold powder. At the same time reduce the operating environment temperature, slow down the printing speed, adjust the pressure, strengthen the air volume and far infrared light. If the resin itself is sticky, replace the resin.
2 The fastness of the peeling ink layer is extremely poor, and the gold and silver powder particles can easily fall off. The reason is that using a single solvent to directly harmonize gold and silver powders, lacks the necessary viscosity. Can be solved by changing the link material.
3 burrs, spots phenomenon is a large area of ​​part of the speckle pattern, the gloss is very poor; part of the printing ink is the edge of the graphic diffusion. The reason is that the printing is too light, the solvent is too much, the leveling property is poor, the pattern is too deep, and the plastic film is electrostatically accumulated. The method of elimination is to control the amount of solvent and apply anti-static treatment to the plastic film, and the pattern should not be too deep when making the plate.
(4) The reason for the poorly-printed part of the escape line is that it is unclear or the ink cannot be printed. The reason is that the linking material dries too fast and the printing speed is too slow. A large area of ​​gold and silver ink blocks and thin lines coexist in gold. The exclusion method is to adjust butanol, adjust the printing speed, and divide the large-area color and thin lines into two plates.
The five-color gray gold and silver ink is dark and dull. The reason is that the reconciliation time is too long. It is oxidized or eroded by acids, alkalis, sulfur and other chemical substances, and is colored with other inks. The method of elimination is that gold ink is used with the adjustment and the ink pump, pipe, ink tank and printing plate are cleaned on time to prevent cross-coloring. Once the color is strung, it is replaced immediately.
6 Paste Gold and silver inks have dried in the printing plate texture before they have been transferred to the film surface. The reason is that the printing plate has not been cleaned in time, so that the residual ink is solidified in the pattern and gradually accumulated, so that patterns, lime sand and the like are incorporated into the ink. The exclusion method is to clean the plate at any time and pay attention to the hygiene of the operating environment.
2. The type of gravure:
Gravure has two major categories: gravure and gravure. Photogravure is further divided into traditional gravure (ie, carbon paper or photogravure) and photographic gravure. The engraving gravure is divided into hand carving, mechanical carving and electronic engraving. Currently used are gravure, photographic gravure and electronic engraving gravure.
1 gravure is on the dichromate sensitized carbon paper, first drying gravure network, and then drying continuously adjusted positive image, and then transfer the carbon paper image onto the roller, through the development, Fill plates and corrodes to make plates.
(2) Photogravure Gravure plate printing method applies direct emulsion coating on roller by spraying method or slip ring method, directly exposing printing plate with positive plate added with concave net, then developing, filling plate, and etching to obtain printing plate. .
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