Back to results
US 4,734,231 AGranted
Process for the preparation of fiberboards
AssigneeGunei Kagaku Kogyo Kabushiki Kaisha
InventorsKiyozi Morita, Masami Ando, Mitito Yamasaki
Life of this patent
Estimating the term…
Abstract
A process for the preparation of a fiberboard, including the steps of: providing a fiber layer or mat; forming at least one layer of expandable phenol resin particles over and/or under the surfaces of the fiber layer; and hot pressing the resulting superimposed layers to allow the expandable phenol resin particles to expand and to fill the void space within the fiber layer and to consolidate the fiber layer.
Claims6
A process for the preparation of a fiberboard, consisting essentially of the steps of:
- providing a layer of loose fibers;
- forming at least one layer of expandable phenol resin particles adjacent to at least one of the upper and lower surfaces of said fiber layer, the amount of said particles being 10-150 parts by weight per 100 parts by weight of said loose fiber;
- and
- heating said layer of loose fibers and said at least one layer of expandable phenol resin particles under 0.5-30 Kgf/cm.sup.2 pressure at 120.degree.-200.degree. C. for 0.5-30 minutes to cause said expandable phenol resin particles to expand and to fill the void space within said fiber layer, thereby consolidating said layer of loose fibers.
1 more element
Dependencies are inferred from the claim text.