Under-utilized Canadian wood species for strand based products

用于线材产品的加拿大木材品种未得到充分利用

• 批准号: 476414-2014
• 负责人: Smith, Gregory
• 金额: $ 1.46万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618417
• 关键词: Under; utilized; Canadian; wood; species

Canada has very large resources of trees such as Balsam Poplar (Populus balsamifera), Black Cottonwood (Populus trichocarpa), Jack Pine (Pinus banksiana), that are only minimally used in the strand-based product industry for a variety of reasons. Many of these other wood resources may be potentially suitable and close to some production facilities but are currently not or underutilized for composite board production. Since they are not as ubiquitous as Aspen (P. tremuloides), and there is less experience and information available to industry as to how this species converts to strands, flows through the blending and mat forming processes, and translates into board physical and mechanical properties. In some cases, such as Balsam Poplar, there are well-known problems experienced in conversion and utilization for OSB. The goal of this project is to generate data on stranding and OSB production from selected readily available but underutilized hardwoods and softwoods. This information will be used to produce a set of guidelines as to optimal stranding parameters as well as guidelines on differences in the pressing schedules between these species and Aspen for producing OSB with the optimum density profile and mechanical properties. Key project components include: (a) Material characterization - density, wood structure and moisture content, as it affects strander set up and strand quality outcomes; (b) Conversion to strands - target thickness 0.5 to 0.7 mm, width 18-25 mm, and length between 60 and 120 mm. Adjustable strander parameters include operating speed, knife protrusion (coupled with feed rate) and counter knife angle; (c) Strand behavior in key OSB processing stages: blending with resin, mat-forming, hot pressing; (d) Performance with different resin types and quantities. The two major resin systems used in OSB manufacture, either singly or in combination are Phenol Formaldehyde (PF), and Polymeric Methylene Di-Isocyanate (pMDI). OSB boards will be fabricated using both these resins, either singly, or in tandem (PF surfaces, pMDI core).

加拿大有大量的树木资源，如香脂白杨（Populus balsamifera）、黑棉白杨（Populus crucarpa）、短叶松（Pinus banksiana），但由于各种原因，这些树木在基于木材的产品工业中的使用很少。许多这些其他木材资源可能是潜在的合适的，并接近一些生产设施，但目前没有或利用不足的复合板生产。由于它们不像白杨（P. tremuloides）那样普遍存在，并且对于该物种如何转化为股线、流过共混和垫形成过程以及转化为板的物理和机械性能，工业上可用的经验和信息较少。在某些情况下，如香脂白杨，在转化和利用定向刨花板方面存在众所周知的问题。该项目的目标是从选定的现成但未充分利用的硬木和软木中产生关于搁浅和定向结构刨花板生产的数据。这些信息将被用来产生一套准则，以最佳的绞线参数，以及在这些物种和白杨之间的挤压时间表的差异，生产定向结构刨花板的最佳密度分布和机械性能的指导方针。项目的主要组成部分包括：（a）材料特性-密度、木材结构和含水量，因为它影响绞线机设置和绞线质量结果;（B）转换为绞线-目标厚度0.5至0.7 mm，宽度18-25 mm，长度60至120 mm。（c）在关键OSB加工阶段中的原丝行为：与树脂共混、垫成型、热压;（d）不同树脂类型和数量的性能。OSB生产中使用的两种主要树脂体系（单独或组合）是酚醛（PF）和聚亚甲基二异氰酸酯（pMDI）。OSB板将使用这两种树脂单独或串联（PF表面，pMDI芯）制造。