三种速生建筑材树种制造中纤板的制浆工艺和磨片选型

Defibering Processes and Determination of\=Refining Plate Pattern for 3 Plantation Building Use Species\=Used for Manufacturing Medium Density Fiberboard

研究了供制造中密度纤维板用的三种速生建筑材的制浆工艺和磨片齿形。试材树种为杉木、火炬松及湿地松；磨片齿形有中细齿、粗齿及中齿三种；木片蒸煮汽压固定为０４～０６５ＭＰａ，蒸煮时间分别为３，６，９及１２ｍｉｎ，磨盘间隙０１ｍｍ。研究结果表明，三种齿形制浆所得中长纤维（留于３２～１１５目）占总纤维量的５０％～７０％，尤以中齿形磨片制浆，效果更好；在３～１２ｍｉｎ的蒸煮时间内，纤维分离效果及制板后板的平面抗拉强度无明显差异，因此以采用３ｍｉｎ的蒸煮时间较为合理。

Defibering processes of 3 plantation building use species used for manufacturing medium density fiberboard(MDF) were investigated and appropriate refining plate pattern was determined. Experimental conditions were as follows: 1)species were Chinese fir(Cunninghamia lanceolata),loblolly pine(Pinus teada)and slash pine(Pinus elliottii); 2)3 refining plate patterns were classified as mediumfine,medium and coarse; 3)chips were steamed under fixed pressure of 0.40.65MPa for 3,6,9 and 12 min respectively; 4)refining plate gap was adjusted to about 0.1mm.Experiment results showed: mediumlong fibers(retained on 32115 mesh) content was 50%70%,but medium plate pattern produced better fiber, cooking time had no significant effect on fiber quality and internal bond so that 3 min was enough for cooking.