Macmillan Bloedel Limited

Trus Joist Macmillan a Limited Partnership

Douglas Elliot Rogerson

Marek Jan Gnatowski

Robert L Pike

Kenneth K Lau

Ronald M Stout

A fiber-cement trim board is formed by a fiber-cement core layer faced with a pair of fiber-cement surface layers of substantially equal thickness in the core layer and have a cement-to-wood ratio by weight of between 2 and 3.5 and at least 70% of the wood strands have a length longer than 10 min. Each of the surface layers is formed of a fiber-cement mixture containing wood strands, at least 80% of which have a length of less than 4 mm and a cement-to-wood ratio by weight of between 2 and 3.5. The board is covered at least on the two main faces by a water barrier coating.

Trim board

A composite wood product made from discrete wood particles secured together by a cured bisphenol A formaldehyde resin cured from an A-stage bisphenol A formaldehyde resin having an A-stage bisphenol A to formaldehyde mole ratio of 1 to between 2.5 and 4 and between 3 and 11% of caustic measured as sodium hydroxide based on the weight of resin solids. Preferably the resin will include 2 to 10% urea based on the resin solids. The cured bisphenol A formaldehyde resin secures the wood particles together to form a composite wood product having light colored glue lines that substantially corresponds in color with the wood so that the glue lines tend to be unnoticeable.

Wood composites with light colored glue lines

An extender for synthetic resin glues made up of wood particles comminuted to the point where substantially no whole structure is left, and preferably most of the wood particles having hardened resin thereon to aid in the comminution thereof.

Growing community of inventors

Richmond, Canada

Douglas Elliot Rogerson