Food Box For Macarons gravure printing process is the most difficult three problems, three tips to solve

Food Box For Macarons gravure printing process is the most difficult three problems, three tips to solve

Compared with offset printing, gravure printing on the operator's technical experience requirements are not high, but in the actual production will always appear a variety of sudden technical problems, these problems if not solved in time, will have a greater impact on production efficiency, yield.

Ingenious solution of gravure black ink ink and white phenomenon

Sudden problem: Since any packaging of Food Box For Macarons needs barcode printing, black ink has become an indispensable ink in packaging printing, but it is easy to melt ink and whiten when printing black ink in gravure.

Black ink solvent ink refers to the ink or light oil in the same system with black ink dieyin, can make black ink printing graphic edge blur phenomena occur, and this kind of blur phenomena under the action of scraper will be stretched, resulting in a waste, especially the light oil with black ink dieyin black ink solvent ink phenomenon, easier to be produced when this is because the light oil in the same as the black ink solvent will have certain dissolve effect on black ink.

There are three main reasons for the formation of whitening phenomenon: one is the ink itself black enough; Second, ink manufacturers in the production of black ink used in the proportion of the basic color material has a certain problem, such as to save costs, in the use of yellow, magenta, green three color base color material modulation black ink and added 50% of the finished black ink; Third, the amount of black ink printing is too large, and the number of repeated use of return ink is too much.

Solution skills: appropriate change the black ink system, so that it and overprinted on the ink system changes, such as the use of ester soluble light oil and ester soluble black ink, can be added in the ester soluble black ink according to the ratio of 2∶1 benzene alcohol soluble black ink, so that the black ink and light oil system is different, so as to eliminate the phenomenon of black ink. This method also works for whitening, and it works very well.

To improve the printing resistance of large area intaglio

Sudden problem: the biggest characteristic of gravure printing is a large area of field printing color stability, color saturation, and the printing resistance of gravure mainly depends on the graphic structure and distribution ratio of the field block, usually square, round and other field block upper and lower ratio is basically the same, gravure printing resistance is higher; The gap between the upper and lower proportions is large (such as the middle field block is larger, the two sides of the field block is smaller; Both sides of the field block is larger, the middle field block is smaller; When one side of the field block is large, the other side of the field block is small, etc.), gravure printing resistance is low.

This is mainly because when the gap between the upper and lower proportions is large, the blade part corresponding to the large field block wears more, and the rest of the part wears less, which causes the uneven force of the blade, so that the pressure of the blade needs to be increased constantly. In this way, the wear of the gravure is large, and the printing resistance of the gravure will be reduced.

Solution: Add several field strips with the same length and width of 6 ~ 7mm to the vertical front and rear non-graphic parts of the small part of the field block, so as to support the wear area, so as to achieve the purpose of uniform force on the scraper, and improve the intaglio printing resistance to a certain extent. According to the author's actual operation statistics, this method can increase the printing resistance of intaglio by 50%.

Special gravure printing overprinting precision

Sudden problem: In recent years, the development and application of a large number of new materials (such as laser paper, flash gold sand, silver sand ink, etc.) and new technologies in gravure printing field have changed the tradition of gravure printing only white card paper and film.

We know that web gravure is through the cursor probe testing overprint tag to realize accurate overprint color between groups, the traditional white cardboard, film and conventional gravure ink, the reflections are not strong, and a new type of laser paper (especially laser beam paper), gleaming gold sand, sand silver ink has strong reflective, The cursor detection system of most gravure printing machines in China is difficult to detect it effectively.

Solution: when laser paper is used as the printing material, it is usually necessary to print white ink. Practice has proved that conventional gravure white ink has strong reflectivity in the background of laser paper, which will lead to certain fluctuations in the accuracy of cursor probe tracking overprinting, so that the overprinting accuracy of gravure printing machine will also fluctuate, or even stop.

The solution is to add a trace of blue ink in gravure white ink. This is because under the perception of human eyes, these blue ink will not only make white ink blue, but also increase the whiteness of white ink, and even reduce the reflection of white ink. In this way, the cursor probe on gravure printing machine can easily identify the overprint mark. For the flash of gold sand, silver sand ink and other reflective ink, it is used to change the Angle of the cursor probe to reduce the influence of its reflective on the cursor probe, usually the cursor probe and paper into 5° of the detection Angle.