EFFECTS OF THERMAL PRE-TREATMENT AND VARIABLES OF PRODUCTION ON PROPERTIES OF OSB PANELS OF Pinus taeda
نویسندگان
چکیده
The main objective of this study was to compare the effect of thermal pre-treatment in particles of strand type with the effect of variables of production on physical-mechanical properties of OSB panels, aiming to improve their dimensional stability. The experimental design consisted on five treatments with the assessment of two temperatures of thermal treatment on particles (200 and 240°C) during 60 minutes; the increase of adhesive content, the application of paraffin in different treatments and a control treatment. For each treatment three panels with Phenol-Formaldehyde adhesive were produced. The cycle of pressing panels was: pressure of 3.5 MPa and temperature 160°C during 8 minutes. Analyzing the results of tests it was possible to conclude that: the thermal treatment of particles at 200°C promoted a negative effect on physical and mechanical properties, while thermal treatment of particles at 240°C promoted a significant improvement on physical properties and reduction of mechanical properties. The increase on adhesive content resulted in a significant improvement of WA24h, and the application of paraffin improved the WA2h and TS2h of panels, however such treatments were not so efficient on keeping the dimensional stability of OSB panels as a thermal treatment applied on particles at 240°C.
منابع مشابه
Interactive effects of fertilization and throughfall exclusion on the physiological responses and whole-tree carbon uptake of mature loblolly pine
Few studies have examined the combined effects of nutrition and water exclusion on the canopy physiology of mature loblolly pine (Pinus taeda L.). Understanding the impacts of forest management on plantation productivity requires extensive research on the relationship between silvicultural treatments and environmental constraints to growth. We studied the physiological responses of 18-year-old ...
متن کاملEffects of a Commercial Chitosan Formulation on Bark Beetle (Coleoptera: Curculionidae} Resistance Parameters in Loblolly Pine1
J. Entomol. Sci. 46(2): 124-134 (April2011) Abstract A commercially available chitosan product, BeyondTM, was evaluated for its effects on loblolly pine, Pinus taeda L., responses believed related to bark beetle resistance. Treatments were applied 4 times at approx. 6-wk intervals between May and November 2008. Five treatments were evaluated: ground application (soil drench), foliar application...
متن کاملThe Use of an Artificial Neural Network for Modeling the Moisture Absorption and Thickness Swelling of Oriented Strand Board
In this study, an artificial neural network (ANN) approach was employed for modeling the moisture absorption (MA) and thickness swelling (TS) properties of oriented strand board (OSB) in various applications. A series of ANN models were developed for the analysis and prediction of correlations between processing parameters and MA and TS of OSB. An ANN model was found for modeling the effects of...
متن کاملThe Influence of Affective Variables on the Complexity, Accuracy, and Fluency in L2 Oral Production: The Contribution of Task Repetition
The main purpose of the study reported in this paper was to examine the interrelationships between L2 risk-taking, English learning motivation, L2 speaking anxiety, linguistic confidence, and low-proficiency English as a foreign language (EFL) learners’ speaking complexity, accuracy, and fluency (CAF). A secondary purpose was to test whether task repetition can influence the level of the mentio...
متن کاملEvaluation of intercropped switchgrass establishment under a range of experimental site preparation treatments in a forested setting on the Lower Coastal Plain of NorthCarolina, U.S.A
There is growing interest in using switchgrass (Panicum virgatum L.) as a biofuel crop and for its potential to sequester carbon. However, there are limited data on the establishment success of this species when grown as a forest intercrop in coastal plain settings of the U.S. Southeast. Therefore, we studied establishment success of switchgrass within experimental intercropped plots and in pur...
متن کامل