English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Use of Amazonian wood residues from the mechanical processing in the high density particleboard production The purpose of this research was to evaluate the potential use of Amazonian wood residues from the mechanical processing of Caryocar villosum, Hymenolobium excelsum, Mezilaurus lindaviana, Erisma uncinatum, Tachigali myrmecophyla and Qualea paraensis in the high density particleboard production. The panels were produced with nominal density of 850 kg.m, nominal thickness of 15.7 mm and phenol formaldehyde adhesive. Sixteen treatments were analyzed by four consecutive experiments, which evaluated the physical and mechanical properties of the boards produced from the six species and an equal mix of all six, the effect of removing the fines in the production process, the influence of the change of 8% adhesive content to 11% on the properties of the panels and the use of the mixture proportion of 50% with veneers residues of Schizolobium amazonicum. Their performance was evaluated with respect to their physical (apparent density, moisture content, water absorption and thickness swelling) and mechanical (static bending – modulus of elasticity and modulus of rupture, internal bond, direct screw withdrawal and Janka hardness) properties, conducted according to ABNT NBR 14810-3 (2006b). The evaluation of the density profile of the panels was also performed by Xray attenuation methodology. It was observed that the particleboard manufactured with wood residues from Caryocar villosum, Hymenolobium excelsum and Tachigali myrmecophyla presented, in general, technological properties superior to other species, according one or more minimum requirements specified by ANSI A208.1 (2009) for high density panels (H-1 grade) and panels for the production of floors (PBU grade). The removal of the fine in the production of panels resulted in a tendency to increase the values of MoR, MoE, internal bond and Janka hardness and contributed to reduce the WA2h, WA24h and TS2h, besides formed more homogeneous density profiles. The increase from 8% adhesive content to 11% resulted in a tendency to reduce the values of WA2h, WA24h, TS2h and TS24h and increased Janka hardness values, as well as presented significant interactions for the MoE and internal bond, besides formed profiles with higher peak density in the faces and lowest density values in the core. The utilization of 50% mixture proportion with Schizolobium amazonicum particles resulted in a tendency to increase the values of MoE and direct screw withdrawal from the edge and reduced the values of Janka hardness. There were significant interactions between the factors for WA24h, TS2h, TS24h, MoR and internal bond properties, resulting in a tendency to increase the values. The mixture of 50% originated profiles with higher peak density in the faces. The particleboard manufactured with Amazonian wood residues showed potential use and viable alternative from a technological point of view for residues recovery.

Aproveitamento de resíduos do processamento mecânico de madeiras amazônicas para a produção de painéis aglomerados de alta densificação