Under-utilized Canadian wood species for strand based products

加拿大拥有非常丰富的树木资源，如苦杨（Populus balsamifera），黑棉（Populus trichocarpa）， Jack Pine (Pinus banksiana)，由于各种原因，这些树木在基于股的产品工业中只被最低限度地使用。这些其他木材资源中有许多可能适合并靠近某些生产设施，但目前没有或没有充分利用来生产复合板。由于它们不像白杨（P. tremuloides）那样普遍存在，而且工业上关于这种物种如何转化为股，如何通过混合和垫成型过程流动，以及如何转化为板的物理和机械性能的经验和信息较少。在某些情况下，例如Balsam Poplar，在OSB的转换和利用方面存在众所周知的问题。这个项目的目标是，从一些现成但未充分利用的硬木和软木中获取搁浅和OSB生产的数据。这些信息将用于制定一套关于最佳搁浅参数的指导方针，以及关于这些物种与白杨之间的压榨时间表差异的指导方针，以生产具有最佳密度剖面和机械性能的OSB。关键项目组成部分包括：(a)材料特性-密度，木材结构和水分含量，因为它会影响绞线装置和绞线质量结果；(b)转换成股-目标厚度0.5至0.7毫米，宽度18至25毫米，长度60至120毫米。可调绞线机参数包括运行速度、刀突（与进给量耦合）和反刀角；(c) OSB关键加工阶段的钢绞线行为：与树脂共混、垫成型、热压；(d)不同树脂种类和数量的性能。在OSB制造中使用的两种主要树脂系统，无论是单独使用还是组合使用，都是酚醛（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。

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).