UBC Theses and Dissertations
The optimization of the pressing parameters for producing oriented strandboard (OSB) panels with a uniform vertical density profile (VDP) Dai, Hengliang
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.
Item Citations and Data
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