초록 ▼

A method for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a polyisocyanate binder is applied to the hot and wet fibrous material in the blow line out of the refiner of the board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4

A method for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a polyisocyanate binder is applied to the hot and wet fibrous material in the blow line out of the refiner of the board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4′-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.

대표청구항 ▼

In a process of producing a synthetic board from cellulosic material and a binder wherein (a) said cellulosic material is subjected to the action of steam under pressure and refined to hot and wet fibers, (b) said hot and wet fibers are partially dewatered, (c) said partially dewatered fibers are fo

In a process of producing a synthetic board from cellulosic material and a binder wherein (a) said cellulosic material is subjected to the action of steam under pressure and refined to hot and wet fibers, (b) said hot and wet fibers are partially dewatered, (c) said partially dewatered fibers are formed into a mat, and (d) said mat is subjected to heat and pressure to form said synthetic board, the improvement comprising applying an organic polyisocyanate binder to said hot and wet fibers from said refining step (a).