过热蒸汽压力对表层微压缩桦木地板坯料尺寸稳定性影响

Study on the Effect of Steam Pressure on the Dimensional Stability of the Light Surface Compression Birch Flooring Blank

为研究过热蒸汽压力对表层微压缩桦木地板坯料尺寸稳定性的影响,以桦木地板坯料为研究对象,采用水热控制的方法对其进行表层微压缩处理。压缩后以过热蒸汽为介质进行热处理,过热蒸汽压力分别为常压、0.20、0.25、0.30、0.35 MPa,温度为180℃,时间为3 h,制得实验样品。对样品的尺寸稳定性进行检测,分析比较蒸汽压力对尺寸稳定性的影响。结果表明,与对照组相比,当压力达到0.3 MPa时,宽度方向上收缩率降低58.56%,膨胀率降低60%;长度方向上收缩率与膨胀率均降低50%;厚度方向回弹率降低了76.12%,说明增加过热蒸汽热处理压力能够显著提高表层微压缩桦木地板坯料尺寸稳定性。

For exploring the influence of superheated steam pressure on the dimensional stability of the light surface compression birch flooring blank,experimental group take the birch flooring blank as the object to research.In the experiment the light surface compression treatment is carried out to it for compressing the flooring blank by hydrothermal control technology.After the birch flooring is compressed,each sample is separately be heat disposed with the superheated steam pressure of atmospheric pressure,0.20,0.25,0.30 and 0.35 MPa,the temperature is 180°C and the time is 3 h.Testing and analyzing the dimensional stability of the birch flooring blank,the effect of pressure conditions on the dimensional stability of flooring blank is analyzed and confirmed.Compared with the control group,the experimental results(0.3 MPa)in this study show that the contraction rate in the width direction is reduced by 58.56%,and the expansion rate is reduced by 60%;while the contraction rate in the length direction is reduced by 50%,and the expansion rate is reduced by 50%;the spring-back rate in thickness direction is reduced by 76.12%.The results show that:after the superheated steam heat treatment,the dimensional stability of the light surface compression birch flooring blank.