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<p>The use of formaldehyde-based adhesives in the production and utilization of wood products leads to the emission of formaldehyde, posing a hazardous risk to both human health and the environment. This study aimed to explore the feasibility of manufacturing Parallel Strand Lumber Polymer Composite (PSLPC) by incorporating waste beech and poplar veneers with a 50:50 weight ratio of thermoplastic adhesive. The thermoplastic adhesive was created by blending two types of recycled polymers—recycled polyethylene terephthalate (rPET) and recycled polypropylene (rPP)—in the ratios of 36:64, 50:50, and 64:36, respectively, along with Maleic anhydride (3 wt%) as a compatibilizing agent. The bonding process involved a laboratory hot pressing procedure at 210&#xa0;°C and 35&#xa0;kg/cm² pressure for 40&#xa0;min to produce PSLPC with dimensions of 20 × 200 × 600&#xa0;mm (thickness, width, and length, respectively). Control samples of PSL were also fabricated using the same poplar and beech veneers bonded with phenol formaldehyde resins at 180&#xa0;°C for 10&#xa0;min under a pressure of 35&#xa0;kg/cm². The results indicated that the highest internal bond strength and screw holding capacity of the PSLPC were achieved with a 64:36 and 36:64 rPET/rPP ratio, respectively. Additionally, the PSLPC samples exhibited superior internal bond strength and screw-holding capacity compared to the control sample. Moreover, the thickness swelling, water absorption, modulus of rupture (MOR), and modulus of elasticity (MOE) of the PSLPC produced using recycled rPP and rPET bonding adhesive were lower than those of the control sample. There is a potential benefit in utilizing the polypropylene- polyethylene-terephthalate combination as an adhesive in the production of wood composites without compromising physical and mechanical properties.</p>

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Determining certain properties of parallel strand plastic composite (pslpc) obtained from waste rotary peeler and a mixture of recycled polypropylene and polyethylene terephthalate

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • Mohammad Shamsian,
  • Sedigheh Kamali Moghadam,
  • Mohammad Arabi

摘要

The use of formaldehyde-based adhesives in the production and utilization of wood products leads to the emission of formaldehyde, posing a hazardous risk to both human health and the environment. This study aimed to explore the feasibility of manufacturing Parallel Strand Lumber Polymer Composite (PSLPC) by incorporating waste beech and poplar veneers with a 50:50 weight ratio of thermoplastic adhesive. The thermoplastic adhesive was created by blending two types of recycled polymers—recycled polyethylene terephthalate (rPET) and recycled polypropylene (rPP)—in the ratios of 36:64, 50:50, and 64:36, respectively, along with Maleic anhydride (3 wt%) as a compatibilizing agent. The bonding process involved a laboratory hot pressing procedure at 210 °C and 35 kg/cm² pressure for 40 min to produce PSLPC with dimensions of 20 × 200 × 600 mm (thickness, width, and length, respectively). Control samples of PSL were also fabricated using the same poplar and beech veneers bonded with phenol formaldehyde resins at 180 °C for 10 min under a pressure of 35 kg/cm². The results indicated that the highest internal bond strength and screw holding capacity of the PSLPC were achieved with a 64:36 and 36:64 rPET/rPP ratio, respectively. Additionally, the PSLPC samples exhibited superior internal bond strength and screw-holding capacity compared to the control sample. Moreover, the thickness swelling, water absorption, modulus of rupture (MOR), and modulus of elasticity (MOE) of the PSLPC produced using recycled rPP and rPET bonding adhesive were lower than those of the control sample. There is a potential benefit in utilizing the polypropylene- polyethylene-terephthalate combination as an adhesive in the production of wood composites without compromising physical and mechanical properties.