Pulp Paper & Logistics
INDUSTRY NEWS 13 ANDRITZ
the system, our commissioning, start-up, and training have been successful. Final brightness is ISO 80-82 per cent which meets the requirements for the top layer. Pulp cleanliness and other fibre properties are exceeding their expectations.” Capacity of the new line is 200
bdmt/d. To replace the virgin top layer, Dongguan Jianhui Paper is now using a combination of old magazines (OMG), sorted office papers (SOP), mixed office waste (MOW), and some white trim. About 40 per cent of the furnish is sourced locally. The remainder is imported from Japan and the USA. The exact furnish mix is determined by quality, price, and supply, so there is some flexibility in sourcing. According to Mr Li, using recovered fibre as the raw material cuts operational costs by about €7-11 per tonne of product produced, giving a very good payback time.
Three-loop design Due to impurities in the recovered fibre raw materials, DIP systems require a series of process stages
To replace the virgin top layer, Dongguan Jianhui Paper is now using a combination of OMG, SOP, MOW, and some white trim. About 40 per cent of the furnish is sourced locally
(or loops) in order to remove and/ or reduce the impurities without harming the fibre material, according to Andreas Gorton- Hülgerth, General Manager of the Pilot Plant for Andritz’s pulping and fibre organization. “A critical
parameter in the system design is the type of ink and the printing process used in the raw material mix,” says Gorton-Hülgerth. “Office papers have what we call a ‘hard’ ink that is fused onto the paper surface. Magazine papers
have a ‘soft’ ink that is printed on the coated surface.” Disintegration without
destroying the fibres 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. Although ink detachment is not fully completed in the first loop, the flotation equipment removes the ‘soft’ inks and dirt particles. With the exception of ink and very small dirt particles, the removal of contaminants is completed in the first loop. A heated and pressurized dispersing system then detaches ink particles and reduces the size of other impurities. The second loop is mainly for
Chen Bo, vice general manager of Dongguan Jianhui Paper
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
4 July/August 2016
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