Third, the common problems and countermeasures in the use of water-based ink
Water-based ink has the advantages of no pollution to the environment, no impact on human health, non-flammability, good safety, stable ink performance, bright color, non-erosion plate, good adhesion, strong water resistance, and the speed of drying can be adjusted. Due to the above characteristics, flexo-printing water-based inks are widely used for the printing and use of electronic products, electrical appliances, foods, cosmetics, and other sanitary and demanding packaging and decoration products. In order to achieve an ideal printing effect during the application process, Now, several common problems and countermeasures in the printing process are described below for reference.
1, the print is too dry
This situation is mainly due to the nature of the ink drying too fast, poor stability, semi-dry state, the ink flow rate is too small or the room temperature is too high. According to the specific circumstances appropriate to add slow-drying agent adjustment, increase the ink flow, improve the air circulation conditions of the plant, so that it reaches the appropriate temperature.
2, the print is too dry
This situation is mainly due to the ink viscosity is too high, the accumulation of ink accumulation phenomenon occurs, the ink nature is poor drying, paper water, poor absorption and so on. According to the situation, the ink is diluted, the degree of contact and the height of the layout are adjusted, the degree of ink drying is adjusted, and paper with good absorption performance is replaced.
3, thin and text part of the print is not clear
This situation is mainly due to poor accuracy of the printing plate, too strong contact pressure, too high ink viscosity, or bad ink lines. In the course of operation, it is appropriate to correct the layout difference, adjust the contact or adjust the ink lines.
4, the print produces flash
This situation is mainly due to the high viscosity of the ink, poor fluidity, too fast drying of the ink, and the contact pressure between the plate and the roller is too strong or paper powder is mixed therewith. In the production process according to the specific circumstances to reduce the viscosity, add slow-drying agent, adjust the degree of drying, adjust the degree of contact or filter with copper mesh ink, fully stirred on the machine.
5, the ink gelation
This situation is mainly due to the wrong use of solvents, mixed use of inks of different brands or properties, improper storage methods or due to changes in the quality of the ink for a long time. According to the specific circumstances can choose to use a special solvent deployment, the ink should be first confirmed before mixing and mixing, different brands or different properties of the ink can not be mixed, the ink should be sealed when sealed, replace the shelf life of ink use.
6, poor printing tolerance
The so-called resistance, that is, light resistance, water resistance, abrasion resistance, should be based on the different requirements of the printing room, select the appropriate ink, the three can not be taken into account.
7, printing bubble
This situation is mainly due to the lack of ink self-relief and defoaming capabilities, lack of ink circulation, and the high viscosity of the air or ink in the ink delivery line. Before use, add defoamer (appropriate amount added, not excessive), increase the circulation of the ink properly, try to avoid the return pipe inserted into the ink or reduce the viscosity of the ink a little. In the production process of the ink to minimize the water supply, add the right amount of varnish.
The shelf life of flexo-type water-based inks is generally one year. If the shelf life is longer or the time is longer, as long as it is not a solidified colloidal state, only the surface is layered or precipitated, and it can continue to be used with sufficient agitation. The storage temperature should be 5°C-30. °C range. Do not store in the open air, do not expose to sunlight, or store or use it in a warehouse below 0°C.
standard test:
Viscosity: 10-25 seconds domestic immersion type 4 cup PH value: 8.0
Fineness: 10-15 μm Coloring force 100% ± Color
Water-based ink has the advantages of no pollution to the environment, no impact on human health, non-flammability, good safety, stable ink performance, bright color, non-erosion plate, good adhesion, strong water resistance, and the speed of drying can be adjusted. Due to the above characteristics, flexo-printing water-based inks are widely used for the printing and use of electronic products, electrical appliances, foods, cosmetics, and other sanitary and demanding packaging and decoration products. In order to achieve an ideal printing effect during the application process, Now, several common problems and countermeasures in the printing process are described below for reference.
1, the print is too dry
This situation is mainly due to the nature of the ink drying too fast, poor stability, semi-dry state, the ink flow rate is too small or the room temperature is too high. According to the specific circumstances appropriate to add slow-drying agent adjustment, increase the ink flow, improve the air circulation conditions of the plant, so that it reaches the appropriate temperature.
2, the print is too dry
This situation is mainly due to the ink viscosity is too high, the accumulation of ink accumulation phenomenon occurs, the ink nature is poor drying, paper water, poor absorption and so on. According to the situation, the ink is diluted, the degree of contact and the height of the layout are adjusted, the degree of ink drying is adjusted, and paper with good absorption performance is replaced.
3, thin and text part of the print is not clear
This situation is mainly due to poor accuracy of the printing plate, too strong contact pressure, too high ink viscosity, or bad ink lines. In the course of operation, it is appropriate to correct the layout difference, adjust the contact or adjust the ink lines.
4, the print produces flash
This situation is mainly due to the high viscosity of the ink, poor fluidity, too fast drying of the ink, and the contact pressure between the plate and the roller is too strong or paper powder is mixed therewith. In the production process according to the specific circumstances to reduce the viscosity, add slow-drying agent, adjust the degree of drying, adjust the degree of contact or filter with copper mesh ink, fully stirred on the machine.
5, the ink gelation
This situation is mainly due to the wrong use of solvents, mixed use of inks of different brands or properties, improper storage methods or due to changes in the quality of the ink for a long time. According to the specific circumstances can choose to use a special solvent deployment, the ink should be first confirmed before mixing and mixing, different brands or different properties of the ink can not be mixed, the ink should be sealed when sealed, replace the shelf life of ink use.
6, poor printing tolerance
The so-called resistance, that is, light resistance, water resistance, abrasion resistance, should be based on the different requirements of the printing room, select the appropriate ink, the three can not be taken into account.
7, printing bubble
This situation is mainly due to the lack of ink self-relief and defoaming capabilities, lack of ink circulation, and the high viscosity of the air or ink in the ink delivery line. Before use, add defoamer (appropriate amount added, not excessive), increase the circulation of the ink properly, try to avoid the return pipe inserted into the ink or reduce the viscosity of the ink a little. In the production process of the ink to minimize the water supply, add the right amount of varnish.
The shelf life of flexo-type water-based inks is generally one year. If the shelf life is longer or the time is longer, as long as it is not a solidified colloidal state, only the surface is layered or precipitated, and it can continue to be used with sufficient agitation. The storage temperature should be 5°C-30. °C range. Do not store in the open air, do not expose to sunlight, or store or use it in a warehouse below 0°C.
standard test:
Viscosity: 10-25 seconds domestic immersion type 4 cup PH value: 8.0
Fineness: 10-15 μm Coloring force 100% ± Color
Eugeng International Trade Co., Ltd. , http://www.shcosmeticpackaging.com