Wisconsin Alumni Research Foundation

The United States of America As Represented by the Secretary of

United States of America, As Represented by the Secretary of Agriculture

Biopulping International Inc.

Jerrold E Winandy

Masood Akhtar

Eric G Horn

Ross E Swaney

William Robert Kenealy

Steven G Hankel

Kent A McDonald

The present invention provides a method for producing an MDF board from pulp from a fibrous lignocellulose material using a treatment or pretreatment step which exposes the material to oxalic acid or oxalic acid derivatives (particularly dialkyl ester derivatives, particularly in the vapor phase). The treated wood is then subjected to a sugar extraction wash and refined using any one of the several pulping methods to produce a final pulp product. Once this is done the pulp is used to make MDF boards having improved water repellency properties.

Method of making medium density fiberboard

Method and apparatus for nondestructively estimating density of contiguous segments along the length of a straight, elongated specimen which is uniform in cross-section and heterogeneous in density throughout its length comprising maintaining the specimen in a horizontal position by supporting it at two points near opposite ends of the specimen; measuring the downward force exerted by the specimen at one of the points while periodically moving the other support along the length of the specimen. The measurements are applied to a static equilibrium equation together with external dimensions to determine segment densities.

Method and apparatus for nondestructively determining the density of a

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Mazomanie, WI, United States of America

Jerrold E Winandy