木制品坯料出材率的影响因素分析

中国木材供应长期存在较大缺口，为缓解木材供需矛盾，提升木制品坯料出材率，以松木锯材为研究对象，现场测定其尺寸规格及缺陷状况，建立锯材登记表。根据实测数据，设计回归试验方案，完成锯材的模拟下锯实验。对模拟下锯实验结果进行回归试验，建立各影响因素对基本坯料体积出材率系数和短坯料体积出材率系数的回归方程，分析并确定各影响因素对各输出指标的影响规律。结果表明，锯材质量和对坯料质量的要求是影响木制品坯料出材率的最主要因素，随着锯材质量的提高和对坯料质量的要求降低，总的坯料体积出材率提升超过12%。提出了利用锯材表面缺陷的相对面积来划分锯材等级的新思路，并建立了锯材等级与优质坯料生产工艺之间的对应关系，为优化下锯关键设备研发提供了基础理论支撑。

Analysis on influencing factors of wood products blank outturn rate

For a long time, there has been a significant vacuum in the supply of lumber in China. In order to alleviate the contradiction between wood supply and demand and to increase the outturn rate of wood products blank. This study employs pine sawn timber as the research object and uses the dimensional specifications and defect conditions measured in the field to construct a sawn timber register. According to the measured data, the experimental scheme of regression analysis was designed and the simulated sawing experiment of pine sawn timber was completed. The regression equation of the outturn rate about basic blank and short blank was established by regression analysis for experiment results and the law of the impact of the factors on output indicators was determined. The results showed that the quality of sawn timber and the requirement for the quality of blank were the most important factors affecting the outturn rate of wood products blank. With the improvement of the quality of sawn timber and the decrease of the quality requirement for the quality of blank, the outturn rate of total blank will increase by more than 12%. A new idea of using the relative area of sawing surface defects to divide the sawn timber grades was proposed, and the corresponding relationship between the sawn timber grades and the production process of high-quality blanks was established, which provided basic theoretical support for optimizing the development of sawing equipment.