It is reported that two thousand years ago the Chinese began to use the horses and the template for the initial screen printing, which to a certain extent promoted the development of human civilization in the world. Nowadays, the proliferation and improvement of civilization has made the screen printing technology continuously improved and perfected. The advantage of simple equipment, easy operation, low cost and wide application range make it shine.
However, with the increase of people's requirements for printed matters, the spot colors and transition colors that appear in prints, and the high precision requirements of customers for printing patterns, traditional screen printing processes cannot meet the needs of the market. At the same time, the long-term, serious pollution problems make it even more subject to criticism. At this point, the author suspects that digital printing may be able to "snap" traditional screen printing.
Traditional silk screen "encounter"
Faced with the ever-changing printing market, various printing methods are taking full advantage of their strengths to stabilize their position. Compared with other printing processes, the traditional screen printing seems to be more and more obvious about the problems of “coarseâ€, “singleâ€, “slowâ€, and “dirtyâ€, making it further into a bottleneck.
"Crude". Screen printing is affected by the mesh density of the screen mesh. Under normal circumstances, the printing accuracy can only reach 80 to 100 lines, but now offset printing and flexo printing have reached 250 lines or more.
"single". Traditional screen printing is mainly based on three primary colors. Even though some spot colors are used, due to the fact that the spot colors are mostly made by manual color matching, the color difference between batches cannot be basically solved. In addition, the problem of transition color is also one of the difficulties that screen printing can hardly overcome.
"SLOW". At present, screen printing companies use a lot of 60×90 semi-automatic screen printing machines. The effective printing area of ​​such equipment is 60mm×90mm. Single-person operation is performed, the working efficiency is low, and each set of color printing needs to be completed. Leave a certain curing time, the printing speed is slower.
"dirty". During the screen printing process, a large amount of organic substances, such as benzene and benzene derivatives, will be volatilized, causing serious safety hazards and causing pollution to the surrounding environment and operating workers.
Digital printing "prescription medicine"
In the era of digital development as the core process, the printing industry has undergone earth-shaking changes. The early color ink-jet printing technology has gone from office automation to industrial production. In my opinion, it can easily and skillfully solve the problems encountered in traditional screen printing.
Introducing digital printing technology into screen printing, first of all, "revolution" the screen printing plate and the squeegee squeegee, replacing it with a dedicated digital printing ink jet head. Due to the elimination of screen printing plates, the printing process is not constrained by the screen density, so the problem of "coarseness" has been solved.
It is not difficult to find that the picture of the product obtained by digital printing is a combination of dots after being enlarged, so the problem of transition color can be solved. At the same time, on the issue of spot colors, it is entirely possible to use advanced computer color grading and color matching technologies to solve problems. Therefore, the "single" problem is no longer a problem.
In view of the "slow" crux of the problem, in the digital printing process, the entire printed image is synthesized once on a digital printing machine, so there is no problem of leaving a certain time for curing after completing each set of colors. The printing speed is only related to the print mode set by the digital press.
The ink used for digital printing uses advanced UV curing technology, and can be cured in time after printing. At the same time, the volatilization of organic solvents is basically the same as that of offset printing. Therefore, as long as partial forced ventilation is performed on the printing area, “dirty†problems can be solved. Now.
Practical operation "swipe" "road rugged"
Digital printing can solve the four problems of traditional screen printing and can provide theoretical basis for its “snappingâ€. However, there are still some points to be considered in practical operation.
1. Equipment investment
A digital printing machine with an effective printing width of about 1 meter and a printing speed of 20 to 30 square meters per hour currently costs 800,000 to 1 million yuan. According to preliminary calculations, after investing in such equipment, it must maintain two shifts per day in order to be profitable. Whoever eats the first crab is often a difficult knot. What's more, most small and medium-sized screen printing companies have had a fair day. Therefore, the screen printing enterprises of medium and small size are mostly waiting to see the transition from traditional screen printing to digital printing.
2. Consumables cost issue
At present, the cost of consumables for digital printing is about 8 yuan/square meter, while the cost of consumables for traditional screen printing is 2 to 3 yuan/square meter, and that of high-quality ones is only 4 yuan/square meter, combined with the manual screen printing, The cost of plate making, through simple calculations, leads to a critical point in the cost of materials for digital printing and traditional screen printing. In theory, the critical point is whether to use digital printing or traditional screen printing. We have compared the cost of digital printing with traditional screen printing for the current environment and digital printing related price reductions.
3. Software upgrade issues
In digital printing, technical depreciation in equipment depreciation projects is much higher than traditional equipment depreciation. In other words, digital printing equipment is often not used badly, but it needs to be replaced due to backward technology. Therefore, digital printing equipment manufacturers should consider the feasibility of upgrading equipment technology as a must-consider item when developing products. It is recommended to provide free technical software upgrades and after-sales services to solve users' worries on technical software.
4. Widespread substrate issues
Traditional screen printing does have the disadvantages of “coarse, single, slow, and dirtyâ€. However, a large number of non-paper materials are currently printed, such as PVC, PE, PP, ABS plates, organic glass, acrylic, ceramics, crystals. The surface printing and decoration of hard plastic materials such as aluminum-plastic composite panels and metal plates are inseparable from traditional screen printing. This is a contradiction that must be solved, and it is also an important issue that digital printing needs to face the traditional screen printing.
As timeliness, high-quality, and environmental protection requirements increase, traditional screen printing may be difficult due to its inherent disadvantages. When we are discussing the use of digital printing instead of traditional screen printing, we can also use new methods and ideas in the traditional screen printing method in order to look forward to its blooming new charm.
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