木材胶合原理讲座

1、木材纤维素OH基与水分子结合1第一部分要点木材的三个切面及性能木材的微观构造木材的实积比重(1.5kg/cm3)木材的水分(自由水和结合水)木材的纤维饱含点(30%)木材各部位的变形情况木材的吸湿滞后现象(2.5%)2第二部分 杨木的胶合性能3第二部分要点一 杨木的边材均呈酸性,大多数杨木的心 材呈碱性;PH变化范围较大.二 杨木心材对PF树脂固化无影响,杨木心材的PH对UF树脂的胶合强度影响很大,PH増高胶合强度下降,增加固化剂填加剂可以提高强度.4第三部分 环境控制56干湿球温度差与木材含水率的关系干球温度干湿球温度差010203035404550212.215.517.017.918.0

2、18.118.218.139.012.014.215.415.816.015.915.846.610.412.213.413.914.014.214.153.88.510.611.812.112.412.612.767.09.210.611.011.211.411.575.38.29.610.010.310.610.783.67.28.89.29.59.79.891.76.18.08.48.89.09.2105.07.27.78.28.58.6114.06.57.27.68.08.0122.95.86.57.07.47.5131.75.05.96.46.87.0144.35.35.96.36.

3、6153.64.75.35.96.2162.94.14.95.45.7181.13.03.94.54.97各种温度和湿度条件下,木材平衡含水率表室内温度相对湿度(%)0510152025303540455004.584.354.123.893.663.443.212.892.752.522.2955.014.774.524.264.033.973.553.303.062.812.57105.505.244.984.724.464.203.933.673.413.152.89156.005.735.455.184.904.634.354.083.803.533.25206.516.235.995

4、.705.415.114.824.534.243.953.66257.206.896.586.275.975.665.355.044.734.424.12307.877.557.226.906.576.255.935.605.284.954.63358.628.287.947.607.266.926.576.235.895.555.21409.439.078.728.368.017.657.296.946.586.235.874510.49.969.599.228.848.478.107.737.366.996.625011.310.910.510.29.769.388.998.618.227

5、.847.455512.512.111.711.311.310.410.09.639.238.828.426013.513.212.712.312.311.511.110.710.39.889.486514.814.414.013.613.612.812.311.911.511.110.77016.315.915.515.115.114.213.813.412.912.512.17517.717.316.916.516.515.715.314.914.414.013.68019.419.018.618.218.217.417.016.616.215.815.48521.320.920.520.

6、120.119.318.918.518.117.717.39023.322.922.622.222.221.421.120.720.320.019.69525.525.224.824.524.523.823.523.122.822.522.110027.927.627.327.027.026.526.225.925.625.325.08 第三部分要点空气的相对湿度相对湿度与干湿球温度计差的关系干湿球温度计差与木材含水率的关系相对湿度和温度与木材含水率的关系我国各地全年平均平衡含水率9 LVL局部开胶的因素1 涂胶不均;2 杨木PH高,心材与心材胶合;3 热压温度和热压时间不足或胶层老化;4 单板