Explore 100% Recycled Newsprint Innovation Deinking Production Paper

Abstract: This article describes a brief history of North American newsprint mills that use waste paper ONP as the main raw material for new construction and transformation of old factories. It also highlighted the innovative deinking line that uses 100% recycled newsprint as raw material.

Keywords: old newsprint deinking optimization process quality benefit

In 1998, Shanghai Hansong potential newsprint factory produced newsprint with 100% waste paper, which was the first news in the country at that time. It played a major role in improving the flow of newsprint mills and promoting production. Then, does the foreign newsprint mill use this kind of ratio? Here is a factory that produces newsprint with 100% waste paper from 2001 to 2003. Look at their situation and what inspired us.

The Abidib Union News Paper Mill in Ontario is located in Thorold. This is the producer of newsprint made from 100% recycled paper in North America, and the first factory in North America that used a floating deinking method at a newsprint mill.

The factory was built in 1913, when it was called Tribune. It is Canada's first factory that owns pulp and papermaking. There are five paper machines producing newsprint. In 1970 the plant was on the verge of a failed competition. In 1981, two new Beloit newsprint machines were put into operation, and a new TMP line was put into operation. At the same time, a production line with deinking based on the washing method was put into production. The ratio of newsprint at that time was sulfite pulp, TMP pulp, and deinking waste paper. When Abitjbi decided to set up the plant, he immediately proposed to use a 100% recycled fiber to propose a construction plan of 50 million Canadian dollars and build a new deinking waste paper workshop. The main reason for the abolition of TMP (wood chip wood pulp) production is to save energy. In May 2001, the program was confirmed. In May 2002, a drum pulper was purchased. In June 2002, a complete deinking line was established. Drum pulper was purchased from Finland. Divided into two parts by a barge, it was delivered before the Iceland Canal in November 2001. The new deinking waste paper production line was contracted with KET Construction Company and Andrity Company in the form of engineering construction contract. BPR is responsible for structural and mechanical design work, and Andrity is responsible for engineering processes.

This drum pulper, with a capacity of 1,600 tons per day, is the largest in the world and can replace the original three intermittent pulpers. The feeding of the drum pulper still depends on the original deinking line. The speed of the new drum pulper is 12 rpm. A water jet enters the drum interior to wash the pulp. Drum pulpers can improve quality better than older batch pulpers. Andrity also offers screening systems for brownstock and fines, and Voith offers floating deinking tanks. The disk thickener is used in the original TMP site and is now also being moved to a new production line. The twin wire presses were purchased from Mackengie BC pulp mills. The screening system also improved the quality of the original screening system by replacing the original 0.010" slotted screen with a 0.006" slotted screen. (i.e. 0.25mm for the original slit screen, changed to 0.15mm) The new deinking line has a single wash deinking tank, while the rest has five primary deinking tanks, plus a secondary floating deinking tank. Another modification is the use of vacuum shoes in floating deinking tanks to move the foam. This was used in the deinking of wastepaper from high-quality paper. This is the first time it has been used in newsprint. Previous factory test work has shown that removing large amounts of dust in the primary deinking tank is much more effective than the secondary deinking tank.

The waste paper processing process can be seen in Figure 1.

In the process of operation, the pulp concentration is controlled to 1.1%, which can help improve the quality of ten. The operation of the deinking system is performed under alkaline conditions with a high yield of more than 88% (absolute pulp). This is a very important issue that involves the economics of the factory. Bases and silicates are added to the fibers as softeners and separate oils and inks. Pulp processing chemicals are different in many factories and fatty acid soaps are added to the ink traps. Fatty acids are purchased externally and mixed in base and water to form a 10% soap. Deinking workshops use a high percentage of synthetic plastic traps. The paper machine part of the factory is conducted under acidic conditions, and the final brightness is controlled by the bisulfite bleaching in the bleaching tower.

Thorold's pulp composition consists of 90% used newspaper (ONP) and 10% coated groundwood waste paper. The source of the secondary fiber is recycled waste paper from the Union's own factory, waste paper from the city, and recovered waste paper collected at the expense. Part of the coated ground wood pulp is finally maintained at a certain whiteness target. The pigment (ie, the coated part) in the waste paper has 10 to 15% of the magazine slurry in the coated wood pulp and the ONP pulp, which can help buffer and stabilize in the deinking tank. The waste from floating deinking workshops is mixed with sludge from sewage treatment and used as fertilizer. For use on local farms. Pulp with whiteness up to the standard value was supplied to the two paper machines of the plant, and the new newsprint machines No. 6 and No. 7 produced standard newsprint. The output of the two machines was 415,000 tons/year. (to be continued)