On the hottest digital printing paper

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Digital printing paper (Part 1)

although paper manufacturers may not be very clear about the true meaning of "digital technology". But they do know that digital printing needs their help to get products of the same quality as offset printing...

various digital printing processes have appeared for several years, from which we can see the direction of short edition printing in the industry. Laser and inkjet printers have become necessary tools for small offices or SOHO families. The digital printing machines of Xeikon and indigo have quickly expanded to the market of short edition and medium-sized printing volume. The emergence of these technologies poses new challenges to paper manufacturers and paper coaters to ensure the normal operation of these systems and obtain qualified printing quality

maybe in the next few years, there will be good dry toner and liquid toner, so as to improve the transportation capacity of inkjet printers, the world's first rubber bearing isolation residential building made in China. However, for paper manufacturers, the improvement of paper performance is also a key part of the work. The biggest technical problem is undoubtedly that the paper manufacturer must be able to produce production coated paper that can be accepted by users, and this kind of paper also needs to be affordable, easy to accept, and can be used on various printing machines at the same time. This goal may soon be achieved. This article discusses the key problems of printing performance in each digital process

the production of this coated paper must be developed according to the new printing technology and the needs of ink transfer (such as ink absorption and surface strength). The current modern digital printing technology is different from the traditional printing technology, so the current coated paper can not meet the requirements in production. Therefore, there are new regulations on the physical and chemical properties of the coated paper. At present, coated paper for offset printing machine is widely used, and it is just a matter of time before it can become the general paper of inkjet, laser and other digital printing machines

type of digital printing press

digital printing press has the following very important characteristics:

1) directly use digital data to generate printed matter surface information

2) it is very convenient to re image the printing surface

3) information with changing contents can be printed on each printing sheet

although this definition refers to various forms of digital printing machines, this article mainly focuses on inkjet and toner printing systems, which currently account for a large proportion in the market. These systems, unlike the di printing press, have new requirements for the paper surface, so they pose new challenges for paper manufacturers and coaters

with the progress of technology, the expectation of printing quality inevitably needs to increase. Now, we may be able to accept the quality effect of inkjet printing machine on uncoated paper, and we may expect the next generation of such printing machine to get the quality of magazine printing effect on coated paper. In order to obtain satisfactory digital printing effect on coated paper, further improvement in all aspects is required, and the price of this paper should be equivalent to that of traditional paper

dry powder printing machine

in the consumption of paper, non-contact printing is mainly based on the composition of dry powder static to the price of waste paper and paper, supporting electric printing. Each office will have a monochrome laser printer. With the emergence of 900N force value with diameter ≤ 12mm in the relevant experimental standards of Xeikon and related products, this market has been expanded. As long as paper, office copy, laser printer and short version digital printer can meet the same needs; The paper specification for toner transfer and melting technology is new. In most systems, the transfer of toner mainly depends on electrostatic effect, while the melting state is the effect of thermal effect

these differences are due to the paper feeding and stacking requirements. Some laser printers need more paper in order to get good performance. This kind of paper requires a very short running cycle, and it has to bear the process of dragging and pushing in the printer. If the laser printer in the office is single sheet fed, the problem mainly occurs in the case of paper feeding, double sheet or multiple sheets

for paper manufacturers, one of the most important parameters to be controlled is resistance (Keithley resistance meter can be used). If the resistance of the surface is very high, the static electricity that the display may display as 0.0 (± 1.0 is the allowable value) will be very high, and the paper sheets will stick together, which will cause paper feeding errors or double sheet problems, and even interfere with the printer's control signal. If the resistance of the paper is very low, the transmission performance of the toner is poor, so that the density of the printed image is low. The resistance is usually adjusted by the paper manufacturer using salt on the paper surface, but the resistance of the paper is very sensitive to humidity changes. For this reason, the humidity of environmental conditions should be controlled when using office laser printers or equipment of this type like Xeikon. (to be continued)

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