The optimization of the pressing parameters for producing oriented strandboard (OSB) panels with a uniform vertical density profile (VDP)
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Dai, Hengliang
issued: 2023-08-14T21:50:16Z
issued: 2023
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: This thesis studied the optimization of the pressing parameters for producing oriented strandboard (OSB) panels with a uniform vertical density profile (VDP) for furniture purpose. In order to identify the key parameters and press cycle that produces a uniform VDP, four experiments were developed by two hot pressing methods were considered (conventional hot pressing and steam injection hot pressing). Two main variables (strand thickness and closing position) were considered. The performed tests included internal bond (IB), bending and elastic moduli (MOR/MOE), vertical density profile (VDP), and face and edge screw withdrawal resistance (SWR). Results suggested the optimization of pressing parameters for conventional hot pressing to achieve a uniform VDP is creep closing schedule, which is the press platens stopped at 19.8 mm in 5s during closing segment and then continued closing with a slower rate to target thickness 18 mm in 10s. The total cooking time was 235s, ended with two degas segments (20s respectively) and a 20s opening segment. Compared to traditional hot pressing, the optimized pressing schedule can achieve a more uniform VDP panel. This means it can achieve a higher edge SWR strength which is the key to OSB suitability for upholstered furniture. In addition, examination of the SWR results showed that both face SWR and edge SWR are not affected by the strand thickness.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/85461
note: THE OPTIMIZATION OF THE PRESSING PARAMETERS FOR PRODUCING ORIENTED STRANDBOARD (OSB) PANELS WITH A UNIFORM VERTICAL DENSITY PROFILE (VDP) by Hengliang Dai MSc., Nanjing Forestry University, 2016 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) August 2023 © Hengliang Dai, 2023 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: The optimization of the pressing parameters for producing Oriented strandboard (OSB) panels with a uniform vertical density profile (VDP) submitted by Hengliang Dai in partial fulfilment of the requirements for the degree of Master of Science in Forestry Examining Committee: Dr. Gregory D. Smith, Professor, Department of Wood Science, UBC Supervisor Dr. Scott Renneckar, Professor, Department of Wood Science, UBC Supervisory Committee Member Dr. Gregory Paradis, Assistant Professor, Department of Resources Management, UBC Additional Examiner Additional Supervisory Committee Members: Dr. Philip Evans, Professor, Department of Wood Science, UBC Supervisory Committee Member iii Abstract This thesis studied the optimization of the pressing parameters for producing oriented strandboard (OSB) panels with a uniform vertical density profile (VDP) for furniture purpose. In order to identify the key parameters and press cycle that produces a uniform VDP, four experiments were developed by two hot pressing methods were considered (conventional hot pressing and steam injection hot pressing). Two main variables (strand thickness and closing position) were considered. The performed tests included internal bond (IB), bending and elastic moduli (MOR/MOE), vertical density profile (VDP), and face and edge screw withdrawal resistance (SWR). Results suggested the optimization of pressing parameters …
has type: Thesis/Dissertation
date issued: 2023-11
is shown at: 10.14288/1.0435195
language: eng
degree discipline: Forestry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Smith, G. D., 1970-
type: Text
identifier URI: http://hdl.handle.net/2429/85461