速生樹種木材製造粒片板之研究（IV-1）粒片板密度對聚異氰酸鹽系膠及尿素膠粒片板性質之影響

Studies on the Manufacturing of Particleboard from Fast-Growing Tree Species (IV-1)-Effect of Particleboard Density on the Properties of the PMDI and UF Glue Bonded Particleboard

陳載永(Tsai-Yung Chen) ； 吳俊萍(Jiunn-Pyng Wu)

《林產工業》 12卷1期 (1993/03) Pp. 72-88

https://doi.org/10.6561/FPI.1993.12(1).5

摘要

以柳杉及泡桐之人工林疏伐之中小徑木為原料，並以異氰酸鹽系膠與尿素膠為膠合劑，用膠量10%，製造三種低密度（0.35、0.45及0.55 g/cm^3）粒片板。綜合其結果如下：1. 靜曲破壞強度、內聚強度與木螺絲釘保持力均隨粒片板密度之增加而增強。以異氰酸鹽膠為膠合劑之粒片板比尿素膠膠合者呈現較大之機械強度。泡桐粒片板之機械強度高於柳杉粒片板。2. 厚度膨脹率隨粒片板密度之增加而增大，吸水率則反之。相同木材原料者，異氰酸鹽膠粒片板之厚度膨脹率小於尿素膠粒片板，膠合劑相同時，柳杉粒片板之厚度膨脹率較小。3. 大體而言，粒片板線性收縮膨脹之總量隨密度之增加而增大，異氰酸鹽膠粒片板之線性總變化率比尿素膠者為小，泡桐粒片板者亦小於柳杉粒片板。在厚度收縮膨脹總變化率上，除泡桐粒片板大於柳杉外，其餘特性與線性變化趨勢相似。

關鍵字

粒片板 ； 聚異氰酸鹽系膠 ； 尿素膠 ； 尺寸安定性

並列摘要

Using the wood thinnings of Japanese fir and Taiwan paulownia tree as raw materials; PMDI and UF glue as adhesive (10% glue level). Manufacturing three kinds of low-density paritcleboard (0.35, 0.45 and 0.55 g/cm^3). The experimental results of this study were summarized as follows: 1. MOR, IB and screw holding strength increased with the density of the particleboards. PMDI particleboards showed the better mechanical properties than UF particleboards. Taiwan paulownia particleboards showed the better mechanical properties than Japanese fir particleboards. 2. The dimensional stability of particleboards was increased with their density; the water absorption is reverse. The dimensional stability of PMDI particleboards were lower than that of UF particleboards (with the same wood species); the dimensional stability of Japanese fir particleboard will be lower than that from Taiwan Paulownia, when the adhesive were the same. 3. Generally speaking, the amount of linear swelling-shrinkage was increased by density. The total linear change of PMDI particleboards were lower than that of UF particleboards; and the total change of particleboards from Taiwan paulownia were lower than that from Japanese fir. In the thickness swelling-shinkage total change rate, except Taiwan paulowina particleboards were larger than Japanese fir; the another properties were the same with linear change tendency.

並列關鍵字

Particleboard ； Polymeric diphengmethane diisocyanate (PMDI) adhesive ； Urea-Formaldehyde Resin (UF) ； Dimensional stability