Discussion on the post printing process of the hot

Discussion on the post printing process of corrugated board flexo 2

types of water-based inks

water-based inks can be roughly divided into two categories: A. rosin maleic acid modified resin series (low-grade), the price is between 8-16 yuan

; b. Acrylic resin series (high-grade), the price is between 20-40 yuan

there are great differences between the two types of water-based inks. Whether it is color, gloss, printing adaptability, water resistance, frost resistance, wear resistance, stability, dryness, water miscibility, viscosity, acrylic resin series inks are much higher than rosin maleic acid modified resin series inks. Therefore, acrylic resin ink is a widely used printing ink

requirements for the correct use of water-based ink

1. Before use, it should be fully stirred to keep the ink composition uniform

2； After opening and using, the stored ink should be covered and sealed immediately to prevent dust from falling and crusting drying up

3. If the remaining ink contains impurities, it should be filtered first, and then used together with new ink

4. Avoid exposure to high temperature or hot sun during storage. Under normal conditions, it can be stored for one year without deterioration

5. if it is found that the viscosity of the ink used is slightly high, an appropriate amount of water can be added for adjustment

printing slotting machine

I talked about some knowledge about printing plate selection and ink, mainly to lay the foundation for the use and operation of printing slotting machine. Now I mainly talk about printing slotting machine. At present, the printing slotting machine is the most common and most widely used equipment for carton processing at home and abroad. It mainly has four parts: paper feeding, printing, indentation, corner cutting and slotting. The general equipment of printing slotting machine includes two colors, three colors, four colors and up to five colors

next, the printing slotting machine is introduced in several parts

1. paper feeding device

1) classification of paper feeding device

① chain paper feeding: expand the k-degree dimension with the diameter of the printing drum, install the chain paper hook, and send the paperboard to the paper feeding roller of the paper feeding Department of the printing machine, so that the paperboard can complete the whole process of printing or printing slotting. This paper feeding is manual paper feeding on the workbench one by one

② back push paper feeding: it drives the paper feeder to make reciprocating motion through the crank connecting rod mechanism with more accurate juice calculation, kicking the paperboards from the lower part of the paper stack to the paper feeding roller one by one, so that the paperboard completes the whole process of printing and slotting

③ leading edge paper feeding: it is the rotation of dozens of rubber wheels in front of the workbench that rolls the paperboard into the paper feeding roller of the printing machine, so that the paperboard completes the whole process of printing and slotting

2) characteristics and uses of the three paper feeding methods

① chain paper feeding. Chain paper feeding is the simplest and most original paper feeding method, which does not require high flatness of paperboard. The bending of the paperboard will not affect the paper feeding effect, but because it is manual paper feeding, the speed is slow, and the fastest is 40-50 sheets/minute. Because this kind of paper feeding is the paper feeding length determined by calculating the unfolding length through the roller diameter, and the chain is British system, the calculated size is approximate, and the whole paper feeding process has the problem of back and forth displacement, so this paper feeding method is not suitable for large-scale production

② push back paper feeding: the push back paper feeding method is a more advanced and currently implemented paper pushing method. It has fast paper pushing speed, can be operated continuously, and is suitable for large-scale production. Its paper pushing effect is highly accurate, and there is basically no error in paper feeding, but this paper feeding requires that the paperboard must be flat, and the paperboard directly touches the sensor connector at the controller end by hand, which is too thin to be applicable

③ leading edge paper feeding: leading edge paper feeding is a relatively high-end paper feeding method. Its speed can reach 300 sheets/minute. It is suitable for large-scale production and for printing and slotting with thin paperboard. This high-end paper feeding method is being tried out in some large enterprises

(to be continued)

for example, when completing the material tensile test, it is clear that:

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