Under-utilized Canadian wood species for strand based products

加拿大拥有非常大量的树木资源，如苦瓜杨树(杨树)、黑色棉(三果杨)、杰克松(班克松)，由于各种原因，这些树木只在以纤维为基础的产品行业中使用得很少。许多其他木材资源可能是潜在的合适的，并且靠近一些生产设施，但目前没有或没有被充分利用来生产复合板。因为它们不像Aspen(P.tremuloides)那样无处不在，而且对于工业来说，关于该物种如何转化为股，通过混合和席子形成过程，并转化为板的物理和机械性能，有较少的经验和信息可用。在某些情况下，如苦瓜杨，在转化和利用OSB方面遇到了众所周知的问题。该项目的目标是从选定的容易获得但未得到充分利用的硬木和软木中产生关于搁浅和OSB生产的数据。这些信息将被用来制定一套关于最佳绞合参数的指南，以及关于这些物种和Aspen之间为生产具有最佳密度分布和机械性能的OSB的压制计划差异的指南。项目的主要组成部分包括：(A)材料特性--密度、木材结构和含水率，因为它影响绞股机的设置和绞股质量结果；(B)转股--目标厚度为0.5至0.7毫米，宽度为18-25毫米，长度为60至120毫米。可调整的绞线机参数包括：(A)操作速度、刀片突出(与进给速度相结合)和反刀角度；(C)OSB关键加工阶段的绞线行为：与树脂混合、垫成型、热压；(D)不同树脂类型和数量下的性能。在OSB生产中使用的两种主要树脂体系，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芯材)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).