Process for strengthening plywood
OwnerJeffrey Madridinventor
Life of this patent
Estimating the term…
Abstract
A process for increasing the strength of plywood. The process includes pressing the piece of plywood between two hard faces which have parallel ridges contacting the two outer sides of the plywood to be strengthened. The plywood is subjected to pressure which permanently impresses a series of parallel grooves in the two outer faces of the piece of plywood. This strengthens the piece of plywood so that it takes more force to break it than the same piece of plywood without such parallel grooves.
Claims10
A process for increasing a load support weight before breakage of a piece of plywood, said piece of plywood having an upper ply and a lower ply having a grain in a first direction and a plurality of inner plies, said process comprising:
- placing a plurality of plies between an upper platen having an upper platen hard face and a lower platen having a lower platen hard face, said plurality of plies having an adhesive in intersections between faces of adjacent plies;
- contacting said upper ply with an upper platen hard face having a plurality of spaced, parallel pointed ridges parallel to said first direction;
- contacting said lower ply with a lower platen hard face also having a plurality of spaced, parallel pointed ridges parallel to said first direction;
- subjecting said plurality of plies to sufficient pressure to cause said adhesive to bond said adjacent plies at said intersections and to impress permanent parallel grooves in an outer surface of said upper ply and an outer surface of said lower ply thereby increasing said load support weight before breakage.
A process for increasing a load support weight before breakage of a piece of plywood, said piece of plywood having an upper ply and a lower ply each having a grain in a first direction and a plurality of inner plies, said process comprising:
- placing a plurality of plies between a generally planar upper platen and a generally planar lower platen, said plurality of plies having an adhesive in intersections between faces of adjacent plies;
- contacting said upper ply with an upper platen hard face having a plurality of spaced, parallel pointed ridges parallel to said first direction and said parallel pointed ridges extending outwardly a distance of about one-eighth of an inch from a generally planar face and said ridges being separated a distance of about one-half of an inch;
- contacting said lower ply with a lower platen hard face also having a plurality of spaced, parallel pointed ridges parallel to said first direction and said parallel pointed ridges extending outwardly a distance of about one-eighth of an inch from a generally planar face and said ridges being separated a distance of about one half of an inch;
- subjecting said plurality of plies to sufficient pressure to cause said adhesive to bond said adjacent plies at said intersections and to impress permanent parallel grooves in an outer surface of said upper ply and an outer surface of said lower ply thereby increasing said load support weight before breakage.
Dependencies are inferred from the claim text.