板坯密度对软木板热压过程中传热的影响

采用先进的温度在线测试方法,在不施加胶黏剂的情况下,研究热压板坯的密度对软木板热压过程中传热的影响。结果表明,软木板热压过程中芯层温度变化曲线可分为4段,即温度几乎不上升的短暂恒温段、水分汽化前的快速升温段、水分汽化时的恒温段、水分汽化后的慢速升温段;随着板材密度的增加恒温段持续时间延长;快速升温段表芯层中心点的温度随着密度的增加,升温速度变慢但程度不同;随着密度的增加板材芯层汽化温度升高,汽化段时间延长;芯层中心点达到100℃的时间也随密度的增加而增加。

Effects of Density on the Heat Transfer of Corkboard during Hot-pressing

Effects of density on the heat transfer of adhesive-free corkboard during hot-pressing were examined by the advanced method of online temperature measurement.Results showed the changes of temperature in the central layer were divided into 4 stages: the short constant temperature stage,in which the temperature was constant or increased very slowly;the fast temperature rising stage,in which the moisture in the mat was not vaporizing;the constant temperature stage,in which the moisture vaporized,and the slow temperature rising stage,in which the moisture vaporizing process was near to the end.Along with the increase of density,the constant temperature period extended.The temperature-increasing rate of the central location temperature of surface and central layers of corkboard mat decrease coupling with the density increases,but the extents are different.Along with the increase of density the core layer vaporization temperature became higher,vaporization period of time extended.And the time of the central location reaching 100℃ is enlarging with the higher density.