樹種之纖維型態與化學組成對應於特種紙應用性質需求之研究 Matching Fiber Morphology and Chemical Composition of Tree Species to the Applicative Quality Requirements of Specialty Papers

格拉辛紙 (glassine paper)是在高含水率下、以高壓壓製而成的具獨特光澤、亮度性質的高密度的紙張，較普通紙為薄且高透明性。本年度試驗即為以赤桉及山黃麻等二樹種，分別經由KP法製漿後，評估做為格拉辛紙之原料可行性。首先，於漿料收率方面，赤桉收率(38.4％)遠低於山黃麻漿料收率(53.9％)。於漿料之卡巴值方面，亦以山黃麻(22.3)較赤桉為低(26.9)。因本紙種須經高度打漿，纖維細胞壁不宜過厚；於纖維型態方面，二樹種漿料之纖維內腔徑與纖維徑（L/D）皆大於70，並與市售紙之間並沒有太大差異，故二樹種皆可製作出與市售格拉辛紙接近的紙張。於物理性質方面，二樹種之物理強度性質皆符合B glassine（40 g）的標準，但由於山黃麻有較高的收率、較佳的平滑度，可減少製漿成本，適合推廣利用。

Glassine paper is a kind of specialty paper formed from low consistency stock under high pressure pressing. It has high transparency, unique glossiness, and high density. The product is usually thinner and less permeable than typical grades of papers. We examined the effect of fiber morphological characteristics on the suitability of making such grade. Eucalyptus camaldulensis and Trema orientalis were used as raw materials. After kraft pulping and bleaching their suitability for making glassine paper was evaluated. With regard to pulp yields, E. camaldulensis gave yield of 38.4% while T. orientalis was a much higher 53.9%. As for the pulp kappa number, T. orientalis pulp was lower than E. camaldulensis pulp (22.3 vs. 26.9). Because this grade requires highly beaten pulp stock, fiber cell wall shall not be overly thick; the ratios of fiber lumen diameter to fiber diameter (L/D) for both species were greater than 70, similar to that of commercial product. Hence, both species are deemed adequate as raw materials for making glassine paper. The physical properties of papers formed from the 2 species all comply with the requirements of B glassine (40 gsm). Due to it much higher pulp yield, however, T. orientalis is more advantageous as a potential raw material source.