林地残材丸太から切削式チッパにより作られたチップの寸法分布と樹種および丸太形状との関係  [in Japanese] Relationship between Chip Size Distribution and Tree Species, Log Diameter and Length: On Wood Chips Processed from Logging Residue Stems with a Cutter-type Chipper.  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

木質チップボイラで使用するために林地残材丸太を切削式チッパで粉砕したチップの寸法を計測し,寸法分布および樹種・丸太形状との関係を分析した。篩い分けと層別サンプリングにより求めた長辺・短辺・厚さの分布は対数正規分布でよく表現できた。樹種・丸太形状との関係では,長辺と短辺ではスギより比重の大きなヒノキで有意に大きい寸法となっていた。短辺については径の大きな丸太の方が寸法の大きいチップの割合が有意に多かった。厚さと長短比は樹種・丸太形状と有意な関係は認められなかった。丸太の長さはチップ寸法に有意な影響を与えていなかった。チップのスクリーニングでは,篩の呼び寸法以上のサイズのチップが篩を通過する場合があるが,寸法分布を考慮し篩寸法を適切に選択すれば長辺寸法の管理は可能であることが示唆された。

Dimensions of wood chips from logging residue stems and comminuted with a cutter-type chipper were measured to examine size distributions and analyze the relationship between tree species and shape of the logs. Size distributions of the chips (destined for burning in a wood chip boiler), <i>i.e.</i> length, width, and thickness were obtained through sieving and a stratified sampling method and expressed with log-normal distributions. Chip length and width of <i>Chamaecyparis obtusa</i> were significantly larger than those of <i>Cryptomeria japonica</i> which has a smaller specific gravity. The proportion of chips with greater width was significantly greater for larger diameter logs than for smaller diameter logs. There was no significant relationship between chip thickness and length-width ratio with the factor of tree species and log shape. Chips larger than a nominal sieve size often go through the sieve; however the results suggest that the actual length of sieved chips can be controlled by appropriate selection of sieve size as related to chip size distribution.

Journal

  • Journal of the Japanese Forest Society

    Journal of the Japanese Forest Society 89(2), 92-101, 2007

    Japanese Forestry Society

Cited by:  1

Codes

  • NII Article ID (NAID)
    110006882859
  • NII NACSIS-CAT ID (NCID)
    AA12003078
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1349-8509
  • NDL Article ID
    8853720
  • NDL Source Classification
    ZR21(科学技術--農林水産--林産)
  • NDL Call No.
    Z18-340
  • Data Source
    CJPref  NDL  NII-ELS  IR  J-STAGE 
Page Top