SURFACE TREATING METHOD OF WOODY MATERIAL

PROBLEM TO BE SOLVED: To provide a surface treating method of a woody material where the surface grinding of the woody material A1 can be stably continued for a long time by preventing the wetting and freezing of the surface of the woody material A1 even if a minute amount of water is contained in an atmosphere and fine dry ice particles D, D, ... when performing blast treatment by spraying the fine dry ice particles D, D, ... on the surface of the woody material A1.SOLUTION: Fine dry ice particles D, D, ... are sprayed on the surface of a woody material A1 while the temperature of the surface of the woody material A1 or together with an atmospheric temperature is held to be 0°C or below or ice-containing fine dry ice particles D, D, ... generated by contacting the fine dry ice particles D, D, ... with steam-containing air are sprayed on the surface of the woody material A1. The wetting and freezing of the surface of the woody material A1 due to water in an atmosphere and a minute amount of water contained in the fine dry ice particles D, D, ... are prevented even if a minute amount of water is contained in an atmosphere and the fine dry ice particles D, D, ... 【課題】木質材Ａ１の表面にドライアイス微粒子Ｄ，Ｄ， を吹き付けてブラスト処理するとき、雰囲気中の水分やドライアイス微粒子Ｄ，Ｄ， に微量含まれる水があっても木質材Ａ１の表面が濡れて凍結することを防ぎ、木質材Ａ１の表面を長時間に亘り安定して研削を持続できるようにする。【解決手段】木質材Ａ１の表面の温度、又はそれと共に雰囲気温度を０℃以下に保持して、その木質材Ａ１の表面にドライアイス微粒子Ｄ，Ｄ， を吹き付けるか、或いは水蒸気を含む空気にドライアイス微粒子Ｄ，Ｄ， を接触させて氷を含んだドライアイス微粒子Ｄ，Ｄ， を生成し、その氷を含んだドライアイス微粒子Ｄ，Ｄ， を木質材Ａ１の表面に吹き付ける。雰囲気中の水分やドライアイス微粒子Ｄ，Ｄ， に微量含まれる水があっても、それらにより木質材Ａ１の表面が濡れて凍結をするのを防止する。【選択図】図１