"Everything has proven to be as good as expected and promised.”
LI GUIHUA
Chairman of the Board and General Manager
of Dongguan Jianhui Paper
Dongguan: High-quality fiber
perfect for top layer
Dongguan Jianhui Paper used to import virgin fiber to produce the top layer of its coated board products. Today, recycle has been substituted for costly virgin fiber thanks to a new 3-loop deinking plant supplied by ANDRITZ.
This was good timing for such an investment,” says Li Guihua, Chairman of the Board and General Manager of Dongguan Jianhui Paper, when referring to the new deinked pulp (DIP) production line. Dongguan Jianhui Paper is a rather new company. First production of coated board began in 2004. A second machine followed in 2005. The installation of a third 600,000 t/a line boosted total capacity to 1.4 million t/a.
Top quality, high standards
According to Mr. Li, his company’s capacity for the production of coated board ranks very high. “Most important, our quality ranks at the top, if not the very best,” he says.
With quality certain, Dongguan Jianhui Paper set its sights on optimizing costs. A major cost factor was the import of virgin fiber for the top layer. Representatives from ANDRITZ showed the results from mills using 3-loop DIP systems to produce pulp with the brightness and quality needed for top layer production.
“We had to be sure that we invested in the best,” Mr. Li explains. “We evaluated the situation carefully before committing. ANDRITZ has the most complete and advanced deinking system in the world. They not only offer a competitive price, but also good quality and a package of services that we considered as being the most superior. Everything has proven to be as good as expected and promised.”
To replace the virgin top layer, Dongguan Jianhui Paper is now using a combination of OMG, SOP, MOW, and some white trim. About 40% of the furnish is sourced locally.
Three-loop design
Due to impurities in the recovered fiber raw materials, DIP systems require a series of process stages (or loops) in order to remove and/or reduce the impurities without harming the fiber material, according to Andreas Gorton-Hülgerth, General Manager of the Pilot Plant for ANDRITZ’s pulping and fiber organization.
Disintegration without destroying the fibers is the main task of the FibreFlow drum pulper. Following the pulper is a cleaning stage that removes heavy particles to reduce the wear on downstream equipment. With the exception of ink and very small dirt particles, the removal of contaminants is completed in the first loop. A dispersing system then detaches ink particles and reduces the size of other impurities. The second loop is mainly for removing detached “hard” inks. A second disperser handles the most resistant ink particles as well as some very small stickies and dirt. The final flotation stage removes the remaining dirt and ink particles. Thickened pulp is sent to a reductive bleaching stage to achieve high final brightness.
Results exceeding expectations
“This customer set high standards, and we worked hard to meet their requirements,” says Liang Wen, Project Manager for ANDRITZ China. “Final brightness is ISO 80-82% which meets the requirements for the top layer. Pulp cleanliness and other fiber properties are exceeding their expectations.”
Capacity of the new line is 200 bdmt/d, using a combination of OMG, SOP, MOW, and some white trim. According to Mr. Li, using recovered fiber as the raw material cuts operational costs by about EUR 7-11 per tonne of product, giving an excellent payback time.
The cooperation between Dongguan Jianhui Paper and ANDRITZ has been “a pleasure” according to Mr. Li. “ANDRITZ people are very responsible,” he says. “They worked with a positive attitude all the way from pre-sales throughout the project and they have been very helpful in optimizing the system.”
CHEN BO
Vice General Manager of Dongguan Jianhui Paper
Due to contaminants in recovered fiber, stock preparation systems require a series of process stages to remove impurities without harming the fiber material. Shown here is the ANDRITZ four-stage cleaner plant.
The ANDRITZ 3-loop system – including drum pulping, three flotation stages, two dispersing stages, screening/cleaning systems, and sludge handling -- is a state-of-the-art system for top layer production. Shown here is a SelectaFlot flotation deinking stage.
