Abstract
The dimensions of raw wood fibers used in papermaking vary considerably. In the process, fiber dimensions can be changed by various treatments and their size distribution can be altered. Fiber dimensions play a crucial roles in the development of many paper properties, particularly its strength, and contribute to the optical and surface properties of paper.Fiber properties can be classified into morphological, structural and chemical properties. For softwood kraft, the most important by far is cell wall thickness. Fiber length and coarseness can be measured reliably with currently available fiber analyzers.No automatic instrument had exited as yet for cell wall thickness ; and the resolution of currently available analyzers was still very coarse even for fiber width measurement ; however, with the aid of latest optical technology, Valmet Automation Kajaani Ltd. has developed FiberLab with which now can offer 1 urn resolution.The followings are the characteristics of FiberLab.1. paper properties can be predicted with superior accuracy with the new measurements.2. Fiber length, width and call wall thickness from single fibers in the sample.3. Fiber length measurements according to TAPPI standard T 271. -Able to determine the ratio of three different wood species in a blend.4. Fiber width and cell wall thickness measurement with 1 um resolution.5. Measure thousands of fibers in only 8 minutes.Together with those characteristics of FiberLab, we'd like to mention the effect of dimensions, especially wall thickness, of fibers on paper properties such as tensile strength, tear strength and tear strength etc. This report summarizes the effects of various fiber dimensions of paper properties and outlines the required measuring accuracy.
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