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Quantitative sizing effect shavings Characterization and mechanical properties of particleboard Relations

Author: ZuoXiaoMeng
Tutor: YuZhiMing
School: Beijing Forestry University
Course: Wood Science and Technology
Keywords: Shaving board Sizing process Sizing effect Mechanical properties
CLC: TS653.5
Type: Master's thesis
Year: 2009
Downloads: 118
Quote: 1
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Abstract


Sizing is particleboard production process is one important process, wood shavings sizing effect evaluation system and testing can effectively reflect the utilization of adhesives, which determines the quality of particleboard, performance and cost. Therefore, the study evaluated the effect of wood shavings sizing system and its detection technology has important significance. Establishment of a new paper shavings sizing effect quantitative characterization parameter system, and scanning system using GluScan adhesive sizing effect on wood shavings were detected and analyzed. Experiment by changing the pressure sizing, sizing parameters such blockbusters on poplar wood shavings and pressed for sizing the distribution of different adhesive chipboard, wood shavings sizing effect of the measured values ​​of the quantization parameter and the mechanical properties of the board explore the impact of the sizing effect shavings major factor in sizing process, wood shavings and sizing effect relationship between the mechanical properties of particleboard, the results showed that: (1) adhesive coverage, glue droplet size and uniformity can be scientifically accurate sizing evaluate shavings sizing effect. Gluscan adhesive scan test system can quickly and accurately measure the parameters of the distribution of the adhesive surface characterization of wood shavings, with a strong practical. (2) determined by the distribution of wood shavings adhesive surface sizing process. When other factors constant, sizing pressure increases, the adhesive tends to increase coverage, gel droplet size decreases, the surface of the adhesive shavings more evenly distributed; when other factors constant, sizing increases, adhesive coverage increased dramatically evident. (3) the desired distribution of the adhesive surface shavings: 30% adhesive coverage; the timber is not less than the cross section of a catheter or tracheid case, the smaller the droplet size adhesive, the greater the number, the adhesive more uniform distribution of the more, the lower limit of optimum droplet size plastic 0.0019mm ~ 2; shavings sizing uniformity on quantitative indicators, the coefficient of variation of the adhesive coverage ideal value of 2; adhesive coverage standard deviation following changes in 10, the best value 0.5, shavings sides adhesive coverage standard deviation varies between 5 and 20, the optimum value of 7.8; shavings adhesive on both sides of the following changes in coverage ratio of 10, the best is 1. (4) sizing effect determines the mechanical properties of particleboard. Sizing sizing increasing amount of pressure and helps improve the mechanical properties of particleboard. Close to the ideal state in the distribution of adhesives, particleboard internal bond strength, bending strength, elastic modulus increases. MOR values ​​of maximum 32.6MPa; elastic modulus maximum of 4700MPa; internal bond strength maximum 0.60MPa.

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CLC: > Industrial Technology > Light industry,handicrafts > Wood processing industry,furniture manufacturing industry > Processing > Wood-based panel production > Waste material system board
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