| 摘要 |
<p>A process for converting a lignocellulosic material into a reconstituted composite prod. comprises (a) treating the lignocellulosic material in divided form with steam to heat the material to a temp. high enough to release hemicellulose but not exceeding the temp. of carbonisation, for a time sufficient to decompose and hydrolyse hemicellulose into free sugars, sugar polymers, dehydrated carbohydrates, furfural prods. and other decompsn. prods.; (b) forming the treated lignocellulosic material into a mat and pressing the mat at a temp. not exceeding the temp. at which the mat would char, at a pressure and for a time sufficient to transform and thermoset the free sugars, sugar polymers, dehydrated carbohydrates, furfural prods. and other decompsn. prods. in the lignocellulose materials into a polymeric substance which adhesively bonds together the lignocellulosic material to yield the reconstituted composite prod.</p> |
