Effect of Pretreatment of Raw Material on Properties of Particleboard Panels Made from Wheat Straw

Abstract

The objective of this study was to evaluate properties of experimental particleboard panels manufactured from wheat straw that had been pretreated with acetic anhydride, soapy solution, hot water, or steam. Wheat straw particles were mixed with commercially manufactured wood particles at a ratio of 60%. Control straw particleboards with non-treated straw and wood particles were also produced. The results showed that the pretreatment of wheat straw significantly improved both the physical and mechanical properties of the straw particleboards. Panels made from wheat straw treated with a 9% solution of acetic anhydride or boiled in a soapy solution resulted in the highest mechanical properties, with an increase in bending strength values. Regarding internal bond strength, the samples made from wheat straw particles treated with acetic anhydride and a soapy solution had 2 and 3 times higher values, respectively, than those of non-treated samples. It seems that the pretreatment of wheat straw had a greater effect on the thickness swelling of the specimens than on their water absorption.

Construction particleboards made from rapeseed straw glued with hybrid pMDI/PF resin

“…The review of literature on the subject shows that numerous investigations into the substitution of wood chips with particles of annual plants have been carried out so far. Owing to the crop size, researchers focus mainly on the use of wheat straw (Grigoriou 2000;Boquillon et al 2004;Azizi et al 2011;Bekhta et al 2013), rice straw (Li et al 2010;Zhang and Hu 2014), flax and hemp (Papadopoulos and Hague 2003), kenaf, bamboo (Papadopoulos et al 2004;Xu et al 2004), corn, sunflower, various grass species, sugar cane, but also on herbaceous plants, such as evening primrose (Hein et al 2011;Dukarska et al 2012;Park et al 2012;Cosereanu et al 2015;Guler et al 2016). Wood particles can also be substituted by tomato stalks and grapevine, kiwi, coffee or tea waste (Nemli et al 2003;Guuntekin et al 2009;Bekalo and Reinhardt 2010), which is an interesting option too.…”

Possibility of using the expanded polystyrene and rape straw to the manufacture of lightweight particleboards

“…Moreover, they usually exhibit lower density than wood, thereby enabling the production of materials within a wide range of densities -from 300 to 750 kg/m 3 . The subject literature shows that the following annual and multiannual plants have been used for these particleboards production: flax, hemp, jute, bagasse, shives of flax, kenaf, cotton and sunflower stalks, stems, cobs, husks and even roasted corn, wheat straw, miscanthus and bamboo (Sellers et al 1993, Kozłowski et al 2001, Wang and Sun 2002, Xu et al 2004, Meinlschmidt et al 2008, Czechowska et al 2010, Bekhta et al 2013. It should be emphasized that the above mentioned plants may provide a potential raw material for the production of low density (100 -300 kg/m 3 ) particleboards, however, only those boards intended for use as insulating material or core layers of laminated composite materials (Sellers et al 1993, Xu et al 2004).…”

Chemical and Physical Parameters of Different Modifications of Rape Straw (Brassica napus L.)

“…An alternative is alkaline treatment, which breaks ester linkages between wax and lignocellulose, as well as dissolving wax and lignin (Binod et al 2010;Wan et al 2011). In this study, winter rape chips were modified by applying hydrothermal and chemical (soaking in sodium hydroxide) processes (Xie et al 2010;Bekhta et al 2013). It is assumed that the modification destroys the waxy, siliceous substances on the surface of the chips and consequently improves adhesion in the composite product.…”

“…105 be done in various ways (Pelaez-Samaniego et al 2013;Trischler and Sandberg 2014). Boiling in water is regarded favorably as a treatment due to its ease of implementation (Bekhta et al 2013). An alternative is alkaline treatment, which breaks ester linkages between wax and lignocellulose, as well as dissolving wax and lignin (Binod et al 2010;Wan et al 2011).…”