Method of joining bodies of green lumber by finger joints
AssigneeCanadian Patents and Development Limited
InventorSuezone Chow
Life of this patent
Estimating the term…
Abstract
Green lumber bodies are finger jointed together, using a heat curable adhesive for wood, by forming fingers on the lumber bodies, heating and drying the lumber bodies until the fingers only are dried to a moisture content of less than 50 percent (oven dry basis), cooling the fingers to which the adhesive is to be applied to prevent precure thereof, and applying the adhesive to these fingers, and then pressing the bodies together at a pressure greater that 150 p.s.i. to interlock the fingers until the adhesive is cured. Heat stored in the lumber bodies is transferred therefrom to the fingers to cure the adhesive. The adhesive may be a phenol resorcinol resin glue.
Claims6
A method of joining bodies of green lumber by finger joints, comprising:
- a. forming a plurality of correspondingly interfitting jointing fingers on the lumber bodies,
- b. heating and drying the lumber bodies at a temperature greater than 59.degree. C until the jointing fingers only are dried to a moisture content of less than 50 percent oven dry basis.
- c. lowering the temperature of the interfitting jointing fingers to which a heat-curable adhesive is to be applied for jointing, to avoid precure of the adhesive while the lumber bodies are separated, while maintaining all of the jointing fingers in the dried condition,
- d. coating the dried jointing fingers which are at the lower temperature, with a heat-curable adhesive for wood,
- e. pressing the jointing fingers of the lumber bodies together in interfitting relationship with an end loading pressure greater than 150 psi on the cross-sectional area of the lumber bodies and,
- f. maintaining the jointing fingers pressed together for a sufficient time for heat stored in the lumber bodies, from the heating and drying, to be transferred to the fingers and set and harden the heat-curable adhesive and bond the interfitting fingers to one another.
Dependencies are inferred from the claim text.