杨木单板连续式热压干燥的研究  

STUDY ON CONTINUOUS PLATEN DRYING OF COTTONWOOD VENEER

作　　者：顾炼百[1] 李大纲[1] 承国义[1] 陆肖宝[1] 

机构地区：[1]南京林业大学,南京210037

出　　处：《林业科学》2000年第5期78-84,共7页Scientia Silvae Sinicae

基　　金："九五"国家科技攻关专题 !( 96 0 11 0 2 0 6)

摘　　要：本文以生长在苏北地区的美洲黑杨单板 (名义厚度 1 7mm)为试材 ,在连续式热压干燥机上进行了生产型试验研究 ,采用高温导热油为载热体 ,热板温度 1 92℃ ,热板压力 0 0 9MPa(前段 )至 0 1 8MPa(后段 )。研究结果表明 :采用高温连续式热压干燥的方式辅以适当的“呼吸”周期 ,可在 2min内将生材单板 (初含水率 1 49%)干至 8%以下的终含水率。干单板基本平整、光滑 ,终含水率均匀 ,无撕裂。单板厚度干缩率平均 5 3 %,横纹干缩率 4 9%。胶合强度平均 0 81 2MPa略高于网带对流干燥的 0 779MPa,结果说明此法干燥人工林杨木单板是可行的。Commercial scale cottonwood veneer drying tests were conducted in continuous platen dryer with high\|temperature heat\|conducting oil as a heat\|carrier and hot platen temperature was 192℃, platen preasure was 0.09 MPa (front section) to 0.18MPa(rear section). The research results showed that high temperature continuous platen drying with certain breathing cycle can dry the veneer from green \[initial moisture content(MC) 149%\] to final MC below 8% in 2 minutes. The dry veneer was basically flat and smooth with even final MC and no check. The thickness shrinkage of the veneer was average 5.3%, and the cross\|grain shrinkage was 4.9%. The bonding strength was in 0 812MPa average,which slightly higher than that 0.779 MPa of convection drying with net conveyer. The results showed that drying of veneer of cottonwood, grown in plantation with the method stated above, is feasible.

关 键 词：杨木单板 连续式热压干燥 干缩 撕裂 

分 类 号：TS652[轻工技术与工程] TS653.2