With digital printing technology maturity and its costs continue to reduce, printing manufacturers to start will traditional offset printing and new type of digital printing technology combined. Their goal is to provide a kind of unique value added services, and make it into profits.
The newspaper, labels, plastic CARDS, retail propaganda page, mail advertising, human resources, these applications are manual will benefit from the color offset printing technology and monochrome digital printing technology union.
But the combination of old and new technology is faced with many technical challenges. Offset printing and digital printing in the process of combining with the manufacturer should fully consider printing, printing, printing ink and things to environmental factors. Because for a printing way, certain conditions may be ideal, but for another kind of printing way but may not be appropriate. Only the effective control in printing, the two variables technology can bring out the best in each other. Based on the above reasons, this paper discusses decided to offset printing and digital printing "fusion" the success of the several key factors.
1. Ink
Ink is offset printing and influence of the combination of the digital printing a important factors, it will directly influence the performance of the printing quality.
Ink is printing production factors in the most cheap but also is the most important. Many offset printing ink does not apply to digital printing machine, this is because in order to improve the resistance of the printing ink, offset printing foiiows often contains a lot of wax and resin. If just use the feature of the offset printing immediately into digital printers, tear sheets will inherit the high temperature of 111 ℃ (in this temperature of the digital printers used to melt and attached to the surface of printing materials), so that the traditional offset printing ink the wax and resin, lead to soften the printing quality appear on the back double, ceng dirty, color to become yellow, image blur, etc. Metal ink and fluorescence in digital printing ink is also in the process, the printing ink of spalling would be stuck to the roller printing machines.
The way of solving the problem is that, by using a kind of high temperature resistant "laser" printing ink adaptability. In order to determine the adaptability, laser printing ink GATF laboratory provides a testing method, the simulation digital printers pressure and temperature. With a splint loaded on ink and paper, that it is in 25 LBS, under pressure in 111 ℃, the operation under the high temperature of 30 minutes, if the sample is stuck, explain this ink do not have laser adaptability.
2. Dry and curing
With laser adaptation of the ink contains hardly or contains only a small amount of wax, resin, and the composition such as foiiows resistance is lower, therefore, also need to polish on the economic, and other special processing, thus a solid ink and pigments. To avoid the offset printing, printing ink happen to soften the manufacturer should through repeated the experiment to determine whether the right formula. By using the laser printing ink printing adaptability, the economic need quite a long dry and curing time, usually offset printing the finish in the economic to 24 to 72 hours after after printing machines to get digital printing. In the process of the offset printing should also pay attention to try to reduce the amount of spray powder, because digital printers are sensitive.
3. Paper
From the requirements of the humidity of paper for digital printing, offset printing is almost the exact opposite. Digital printing for excessive moisture particularly sensitive, dry, cure is the key to the economic impact the quality. Experts recommend the offset printing ink in the process of the minimum and maximum density education version liquid dosage, this will prevent paper in the digital printing occurred in the process and ruffle curly.
The user shall, according to the characteristics of digital printing machine, to choose the type of paper and quantitative. Digital printers use paper generally has the following characteristics: low water content, surface smooth, partial basic. Should try to avoid using the surface rough paper, such as surface uneven texture or rough things, because the dye printing hard to adhere to the such prints surfaces.
DigitalMarket is a special providing personalized E-mail spam and the printers, 85% of its live parts were adopted "the printing" thing, namely first printing used offset printing better graphic, and then with a digital printing machine printing variable information.
Executive vice general manager JoelHoefle explained: "our goal is to make those black, content change font looks like the offset printing up with the same". This company USES the Fuji xerox DocuTech6135, 6180, DocuColor and HPIndigo press1000 of digital printing press. In order to achieve the ideal effect, they selected and test new printing materials, insist to use digital printing machine manufacturers recommended by the paper. Hoefle added: "we are very attention from paper producers know other digital printing of the choose and buy what kind of things, on the market and printing at present the most popular paper what, to help us to make the right decision."
4. Cutting
In the feature of the offset printing will turn into digital printing, must pay attention to the cutting operation.
Paper cutting machine maintenance is vital, and sharp blade can reduce paper, wastepaper, MAO, too much paper hair will lead to the digital printers motor overheating, paper hair stuck in the graphic feature may part, affect the quality of products. In addition, the paper cutting knives lifting height should as small as possible, in order to prevent the paper is located in the top down enough. Also, make sure that the balance of the form the paper. The proposal had better offset printing over of India will Mr Along while, and then store digital printing or cutting processing.
5. The storage of the printing quality
Storage printing, should avoid to packaging close, prevent paper edge curly. If time permits, the best will print put on 10 days or so, wait for ink cured fully before use. The ideal printing store environment is 50% relative humidity, 39 ℃ temperature environment.