Most of the lignin and pectin substances are distributed in the middle lamella, and the separation of mechanical pulp fibers mainly occurs in the primary and middle lamella containing a large amount of lignin and pectin polysaccharide (Franzeiz, 1986 Liu et al., 2016). After defibration, the exposed fiber surface typically comes from different cell wall regions, such as the middle lamella, the primary cell wall, and the secondary cell wall, which have a significant impact on the development of the final fiber properties (Koljonen et al., 2003 Stenius and Koljonen, 2008). It has been suggested that fiber refining in mechanical pulping is carried out by delamination of the fibers and subsequent peeling-off from the outer walls of the cells, such as the P and S1 layers (Lei et al., 2012). Typically, the mechanical pulp is produced in a disc mill by a two-stage process of fiber separation and fiber refining. Compared with chemical pulp, the mechanical pulp has significant advantages such as high yield, bulk, and good printability (Tian et al., 2014 Zhang et al., 2012).
Thermomechanical pulp (TMP) plays an important role in the pulp and paper industry, largely due to its efficient use of resources and low environmental pollution. Therefore, there is an urgent need to develop new pulping technology to significantly reduce the loss of materials and the consumption of dangerous chemicals and water, simultaneously brings us enormous economic and ecological benefits. Chemical pulping processes is one of the most widely studied pulping processes, while it usually needs to consume large amounts of dangerous chemicals during operation. Previous studies show that some pruning residues can be used as raw materials for the paper industry because of their desirable performance (González et al., 2011 Requejo et al., 2012 Moral et al., 2016).
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Making full use of the waste resource will likely alleviate the shortage of pulping raw materials.
A large amount of landscape pruning lignocellulosic fibers is produced in coastal cities annually, including palm, banyan, and mango trees. There are many raw materials from plant residue fibers, such as bagasse, wheat straw, corn stalks, and landscape pruning wood. With the change of waste paper policy of China, the shortage of raw materials has become increasingly serious.
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