Optimisation du procédé d'aboutage par entures multiples du bois d'épinette noire
|Advisor:||Hernández, Roger; Beauregard, Robert; Mohammad, Mohammad|
|Abstract:||In Eastern Canada, black spruce (Picea mariana (Mill.) B.S.P.) has recently been introduced to finger-joined wood products. While there is a growing economic importance of the species in such applications, little information is available on the manufacturing parameters that influence the finger-jointing process for this species. The purpose of this work was to optimize the finger-jointing process of black spruce wood. Various parameters associated with the finger-jointing process were evaluated. Those included the following: finger-joint configurations, curing time and end-pressure, wood temperature and moisture content and wood machining parameters. Isocyanate adhesive was used for all types of evaluations. Results from configurations evaluation indicated that the feather configuration performs better than male-female and reverse profiles, especially for horizontal structural joints. The effect of moisture content on the mechanical performance of joined black spruce wood was not very conclusive. However, the experiment on wood temperature showed the lowest tensile strength at -5°C. Results on the effect of pressure and curing time showed that curing time and end-pressure have a statistically significant influence on the performance of structural finger-joints. Analysis indicated that finger-joined black spruce has the best performance at an end-pressure of 3.43 MPa (498 psi). For wood machining parameters, results indicated that suitable finger-jointing in black spruce could be achieved within a range of 1676 m/min (5498 feet/min) and 2932 m/min (9621 feet/min) of cutting speed and between 0.86 mm and 1.14 mm of chip-load. The microscopical analysis of damaged cells confirmed the effect of cutting speed on the finger-jointing process. In general, depth of damage was more severe as cutting speed increased. Results obtained in this research could help mills to optimize the process and improve the mechanical performance of finger-joined black spruce product.|
|Document Type:||Thèse de doctorat|
|Open Access Date:||11 April 2018|
|Collection:||Thèses et mémoires|
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