Talking about water-based pre-printed gravure and flexo ink
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In recent years, with the continuous development of China's reform and opening up, packaging and decoration products have become more and more exquisite. The role of packaging is no longer simple commodity protection and convenient transportation, and more development towards commercial functions. As the saying goes, "Buy a piece of leather" is the truth. In supermarkets and shops, exquisite packaging can attract customers' interest, stimulate customers' perspective and stimulate customers' desire to purchase. In recent years, the market share of carton packaging in the packaging market is increasing year by year, and the quality of the intrinsic quality and appearance of the packaging box is also stricter. At present, in the multi-color and color packaging of the fine mesh of the corrugated box, most enterprises first use the offset printing corrugated box paper, and then use the single machine to reclaim the corrugated. This solves the problem of product quality quality, but it also has other problems, such as complicated process, high production cost, long production cycle, low carton strength, limited printing materials, limited printing format, high carton rejection rate and large production site. High labor intensity. This is unreasonable and uneconomical for a company. Especially for large cans of cartons, beverages, beer, fruit cartons, small household appliances, cartons and export cartons, etc., due to high production costs, low efficiency, long cycle, can not meet the needs of customers. The traditional printing carton production method will not meet the needs of rapid development. The new carton production process-pre-printing is the most preferred solution for carton making.
What is carton pre-printing: Pre-printing means that the processed roll paper (or other printed substrate) is printed by a printing machine (gravure, flexo) and re-rolled to form a roll print, which is then combined with a corrugated board or other material. The process of bonding together.
Pre-printed features:
1. The printing color can be multi-colored, and high-quality, high-precision and cannon-colored color boxes can be obtained.
2. Printing with different network lines, the print pattern can be fine, and the print consistency is strong.
3. Using quilt and corrugated retanning bonding to improve and improve the strength and stamping strength of corrugated boxes.
4. Use non-toxic water-based inks to print products that meet environmental requirements.
5. Fast printing speed and high output. Cost can be reduced per unit time.
6. The printing material range is wide, the paper is from 80 to 400g/m2; the film can be printed.
The main methods of carton production at home and abroad:
1. Corrugated paper production → Direct printing on paper (flexible version) → Touching and cutting → Bonding nail box.
2. No-face corrugated cardboard → sheet-fed offset printing color printing paper → bonding the paper into a cardboard → touching and cutting the groove → bonding the nail box.
3. Roll paper pre-printed paper (gravure, flexo) + corrugated composite production of corrugated paper production line → touch cutting groove → bonding nail box.
Throughout the three ways of carton production, each has its own characteristics and advantages. From product quality, process control, production efficiency, production management, product loss, environmental protection and other aspects of comprehensive evaluation, web top printing is the most ideal printing method for carton printing.
At present, there are two main printing methods for pre-printing, which are gravure printing and flexographic printing. Comparing the above two printing methods has their own advantages and characteristics. In foreign countries, pre-printing is mainly based on flexible printing; in China, due to the introduction of paper gravure printing machines in previous years, and China's gravure printing technology is more mature than flexographic printing technology, China's pre-printing is gravure printing. Mainly.
Printing is inseparable from ink. Pre-printing inks have mature experience in foreign countries, but in China some time ago it is still blank. Pre-printing inks are mainly based on water-based inks. Water-based inks are favored by people for their non-toxic, odorless, easy to operate, easy to use, and environmentally friendly. As we all know, the 21st century is a century of environmental protection. People have become more and more aware of the importance of environmental protection to human survival and development. Therefore, all walks of life are studying and launching “green” projects to reduce environmental pollution. With the advent of “green food and green products”, “green packaging and green printing materials” will inevitably be required. The biggest feature of water-based inks is the significant reduction of organic volatiles (VOC) emissions into the atmosphere. Water-based inks are the only non-toxic inks currently approved by the American Food and Drug Association.
Pre-printing also has special requirements on paper. Although the printed surface of coated white paper has good color expression, in the process of bonding through corrugated high-temperature drying tunnel, the coating will have different degrees of change, directly affecting the color surface pattern. effect. It is not the most suitable paper; although it can meet the requirements of the corrugated high-temperature drying process, it has a rough surface, which leads to the loss of the printing pattern, the falseness, the poor display force and the large ink consumption. Nor is it the most ideal preprinted paper. Good pre-printed paper should be white cardboard, which can fully express the color of the printed pattern, and can withstand the test of the corrugated high-temperature drying process.