Properties Comparison of North American Particleboard

Transcription

1 Properties Comparison of North American Particleboard Jörn Dettmer, University of British Columbia E: T: 1.(604) Greg Smith, University British Columbia E: T: 1.(604) Wood-Based Composites Center 1 of 23

2 - Outline Outline Rationale Background Industry Survey Methods Results Properties Comparison Materials and Methods Results Summary Wood-Based Composites Center 2 of 23

3 - Rationale Rationale Advancements in production technology of PB suggest change in board properties Key objectives of this study: Industry Survey Identify panel characteristics, furnish compositions, resin delivery systems, and mechanical and physical board properties Panel Properties Evaluation Identify Industry Collaborators to provide board samples Obtain physical and mechanical board properties Compare participating mills with one another and with previous studies Wood-Based Composites Center 3 of 23

4 - Background Background Comparative studies of particleboard Temple-Inland Panel Products (Bautista 1994, Zhang 1994) Particleboard from 25 mills in the United States Cassens et al. (1994) Seven different U.S. mills with 3/8-inch M2 grade particleboard Semple et al. (2005a) Six Canadian plants producing 5/8 M2 grade particleboard Semple et al. (2005b) Comparison study of MS and M2 grade PB from two Canadian manufacturers Wood-Based Composites Center 4 of 23

5 - Industry Survey - Methods Industry Survey Methods Development of online questionnaire with 25 questions 63 MDF and PB plants were contacted 19 plants completed the survey between June 29th and August 12th, 2011 (adjusted response rate of 32.7%) Wood-Based Composites Center 5 of 23

6 - Industry Survey - Results Industry Survey Results Resin costs - Please check one option: 10 7 Resin costs are a major (>50%) part of raw material costs Resin costs are a major (>50%) part of raw material costs Resin costs are a major (>50%) part of raw material costs Wood-Based Composites Center 6 of 23

7 - Industry Survey - Results What types of resin do you use and which one is most commonly used? UF, 1 MUF (1) pmdi (1) PF (1) NAUF/UF (1) MUF/UF, 5 MUF UF MUF/UF NAUF/MUF PF pmdi Wood-Based Composites Center 7 of 23

8 - Industry Survey - Results Are you considering other resination systems? 16 3 Wood-Based Composites Center 8 of 23

9 - Industry Survey - Results Do you verify the efficiency of the resination (particle/fibre coverage)? 6 13 Wood-Based Composites Center 9 of 23

10 - Industry Survey - Results 16 Do you think the resination process can be improved? 3 Wood-Based Composites Center 10 of 23

11 - Properties Comparison - Materials Properties Comparison Materials - Gathering Sample Panels PB manufacturers were asked during the survey to further participate in the study Request for five 4 by 8 boards: 5/8 thick M2 grade Three PB manufacturers from the survey provided sample sets One set of PB was obtained from a local building supplies store One with the support of the technical industry advisors Total of 5 PB sets Wood-Based Composites Center 11 of 23

12 - Properties Comparison - Methods Methods - Properties of Interest Property Specimen Number of samples per ID Manufacturer Panel Sub-panel IB & VDP Thickness Swelling MOE/MOR MOE/MOR fswr eswr eswr Linear Expansion Linear Expansion Wood-Based Composites Center 12 of 23

13 - Properties Comparison - Methods Methods Sample Preparation Each panel was cut into 8 sub-panels Eight different cutting patterns were designed One of eight cutting patterns was randomly assigned to each sub-panel Wood-Based Composites Center 13 of 23

14 - Properties Comparison - Methods Methods Sample Preparation 3D model of the sub-panel Spoil board with drill pattern for vacuum Labeling the sub-panel before cutting Processed board after CNC cutting process Wood-Based Composites Center 14 of 23

15 - Properties Comparison - Methods Methods Testing Conditioning According to ASTM D a: 20 ± 1 C and 65 ± 5% relative humidity Testing According to ASTM D a Wood-Based Composites Center 15 of 23

16 density (kg/m 3 ) density (kg/m 3 ) Properties Comparison of North American PB - Properties Comparison - Results Results VDP - Manufacturer A VDP - Manufacturer C thickness (mm) thickness (mm) Wood-Based Composites Center 16 of 23

17 density (kg/m 3 ) internal bond (MPa) Properties Comparison of North American PB - Properties Comparison - Results Results Vertical Density Profile Internal Bond LSD (S) = LSD (C) = ANSI A (M2) LSD = S1 S2 S1 S1 S2 S1 S2 S1 S S2 C C C C C A C D E F manufacturers A C D E F manufacturers Wood-Based Composites Center 17 of 23

18 thickness swell (%) water absorption by weight (%) Properties Comparison of North American PB - Properties Comparison - Results Results Thickness Swell (2/24 hr) Water Absorption (2/24 hr) A C D E F manufacturers 0 A C D E F manufacturers Wood-Based Composites Center 18 of 23

19 fswr (N) eswr (N) Properties Comparison of North American PB - Properties Comparison - Results Screw Withdrawal Resistance (face) Screw Withdrawal Resistance (edge) ANSI A (M2) LSD = 51.8 a b b d c a b ANSI A (M2) a a b A C D E F manufacturers 0 A C D E F manufacturers Wood-Based Composites Center 19 of 23

20 f SWR (N) f SWR (N) Properties Comparison of North American PB - Properties Comparison - Results fswr Peak Face Density fswr Core Density y = 2.12x R² = y = 1.84x R² = peak face density core density Wood-Based Composites Center 20 of 23

21 MOR (MPa) MOE (GPa) Properties Comparison of North American PB - Properties Comparison - Results Modulus of Rupture Modulus of Elasticity ANSI A (M2) b b c d e e a LSD = 0.58 a d d ANSI A (M2) b b c d d e f a LSD = 0.1 b e d e A C D E F manufacturers A C D E F manufacturers Wood-Based Composites Center 21 of 23

22 - Properties Comparison - Summary Summary One manufacturer had consistently lower properties than the other manufacturers None of the evaluated manufacturers met the voluntary ANSI standard for eswr The best correlation was found between fswr and peak density None of the evaluated manufacturers met the voluntary ANSI standard for MOR Wood-Based Composites Center 22 of 23

23 Thank you! Wood-Based Composites Center 23 of 23