Solve the phenomenon of "solvent" after the splicing of web paper
Sudden problems: Sometimes the operator will increase the printing speed when mass production is performed. As a result, the ink that is not completely dried at the splicing part will run to the next color group and be in contact with the graphic of the next color group. , resulting in the phenomenon of "solving ink" in the text.
Solution: When the paper rolls are spliced, the back side splicing still uses plastic adhesive tape, and the front side splicing uses paper adhesive tape that has not been surface coated.
Solve the problem of "solvent ink" and "whitening" when gravure black ink
Sudden problems: “Soluble†and “whitening†are easy to occur when gravure black ink is used.
Solution Tip: Appropriately change the black ink system to make changes with the ink generation system overlaid on it.
Cleverly mention the printing tolerance of large-area intaglio
Sudden problems: The printing durability of the gravure mainly depends on the graphic structure and distribution ratio of the solid blocks. When the upper and lower ratios are large, the gravure resistance is low.
Solution: Add several real strips with the same length and small width of 6~7mm in the vertical front and vertical rear non-image parts of the smaller part of the solid block to support the wear area, so as to achieve uniform scraping The purpose of the force, and thus to some extent, improve the gravure resistance of the gravure.
Inconsistent shrinkage of web shrinkage
Suddenly the problem: the paper shrinkage and deformation can be eliminated by adjusting the plate or tension, and the shrinkage deformation is inconsistent and cannot be adjusted. This situation will only result in an increase in the reject rate.
Solution: Before the paper enters the first color group, it is first connected and warmed. The temperature is set to 80 °C, so that the paper can be evaporated in advance, so that the paper can remain basically the same throughout the printing process. The shrinkage deformation rate minimizes the rejection rate due to shrinkage of the paper.
Accurate overprinting accuracy of special gravure
Sudden problem: web gravure is the method of detecting the overprint mark by the cursor probe to achieve accurate overprinting between the color groups, while the new laser paper, flash gold sand and silver sand ink have strong reflective properties, domestic large It is difficult for the cursor detection system on some gravure printing machines to effectively detect them.
Solution: Add a small amount of blue ink to the gravure white ink. This is because under the perception of the human eye, these blue inks will not only make the white ink blue, but will increase the whiteness of the white ink and even reduce the reflectiveness of the white ink. This allows the cursor probe on the gravure to easily identify the overprint mark.
The above content is selected from Keyin Media. Printing Technology Packaging and Decoration 2012/10 , please pay attention to the journal channel for more journal content, click on the latest journal content to enter the electronic journal channel of Keyin.com .
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