Reality tells us that inkjet printing is not necessarily environmentally friendly.
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Digital printing, especially inkjet printing, has always been considered an environmentally friendly printing process, and water-based inks are environmentally friendly products that are sought after by the industry and the media. But is this really the case? not necessarily!
According to reports from INGEDE (International Deinking Industry Association), in 2010, a foreign company that produces high-quality recycled paper recycled some photo books printed by HP Indigo. As a result, the de-inking process could not be completed due to the recycled pulp. The company delayed production for 8 hours, resulting in losses of more than 100,000 euros. Since then, HP's HP Indigo over-the-counter products have been removed from the recycling chain of printing paper by the paper mill and collected and processed separately. Hewlett-Packard HP Indigo has also become the first digital printing device to report trouble to paper mills.
Ingede particularly emphasized that the report is not directed at Hewlett-Packard. In fact, almost all products that use ink-based inkjet printing have problems in recycling: paper mills recycle waste paper and prepare for deinking. Dyes and fine pigments cannot be removed when making new, white paper. The result: paper fibers turn grey and paper mills need to struggle to meet quality requirements. Especially for dye-type inks, this problem is more serious, because a little bit of dye can change the color of the pulp. For example, a little red color can make the whole bleached pulp pink. According to INGEDE, there is currently no dye-type ink that can be deinked in paper recycling. This ink is also the mainstream product in the market, occupying the majority of the market.
Green printing and environmental printing should be a complete system engineering, rather than a headache, pay attention to the environmental performance and environmental indicators of a certain link and ignore other links. If environmental protection cannot be considered comprehensively, it may seem to be environmentally friendly, but it is actually a transfer of pollution. Just like printing with dye-based water-based inks, if the paper after use is not recyclable, the waste caused by the later period and the resulting environmental protection are far from offsetting the little VOC emissions advantages brought by water-based inks. . The final composite result may be less environmentally friendly.
However, many manufacturing companies are now aware of this problem and are beginning to focus on developing new technologies to make inkjet inks easier to deink.
Inkjet printing was once considered one of the most environmentally friendly printing processes, but it does not seem to be the case
At Drupa, a new liquid toner technology from Xeikon has brought a new dawn to the sustainable development of digital printing. This liquid toner performs better with different polymer systems: it is the first deinkable product produced with Xacon Quantum technology, similar to dry toner at this point. INGEDE said that after the product is sold, the printed materials produced by this technology will be tested.
Using Quantum Technology Xeikon Xeikon 8000 Digital Printing System
At the same time, inkjet prints have also begun to be deinked. At Drupa, INGEDE (International Deinking Industry Association) and its partner, Australian inkjet technology expert SEPIAX, launched the related products. According to reports, the researchers developed a pigment-coated pigment particle that can be evenly distributed in water like a standard pigment, but after printing, the pigment will adsorb on different surfaces. They can be removed from the print after printing. During the deinking process, the pigment particles are agglomerated into a mass to achieve the size and surface properties required for deinking. The first laboratory test using this ink has been completed, using uncoated newsprint and this new ink to achieve deinkable printing without further optimization. Since then, this ink has been further improved to meet the needs of newspaper printing, and it is expected that the first printing plant will use this ink for production this year.
SEPIAX is a partner of the International Deinking Industry Association and is said to have developed deinkable water-based inks.
It should be noted that not all inkjet systems are not capable of deinking. At present, some prints using aqueous inks can be deinked. These prints use special coated paper to adsorb ink. Or apply a coating before printing to ensure that the pigment particles of the ink solidify immediately (Fujifilm's JetPress 720).
Fujifilm's JetPress 720 digital printing system is said to perform well in deinking
At drupa, Hewlett-Packard introduced a new generation of inkjet inks, and preliminary tests have shown that this ink can be used for some specific papers for deinking. However, it should be noted that this test is performed on a single print and the ink coverage is relatively low. In the future, these inks must be further tested to prove that they can also be deinked in the printing of more typical prints.
It is reported that so far, there have been more than 40 products that have obtained deinkable certification. INDINGE said that dry toner and solid ink (anhydrous inkjet, such as UV inkjet or wax spray) can be used in the production of recycled paper. During the process, it is better to remove from the used paper. In the future, with the continuous investment of manufacturers, it is believed that aqueous inks that can be deinked can be realized. At that time, water-based inks may truly become a model for sustainable development.