Method of providing a structural shape
AssigneesKing W. Evers, George H. Larsen
InventorsKing W. Evers, George H. Larsen
Life of this patent
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Abstract
A method of providing a structural shape includes starting with waste paper and treating the waste paper in a hammer mill to produce paper fibers. The fibers are put through a screen. The screened fibers are mixed with a binder such as a thermosetting epoxy foaming resin or with a phenolic resin in water in preferred proportions. The water or other solvent is kept to a very small value to provide a relatively dry process. The mixture is then pressed in a geometrical shape under substantial pressure (3 to 600 psi). The pressed mixture is then baked or cured at an elevated temperature (175.degree.F to 375.degree.F) for a predetermined time (three minutes to three hours).
Claims4
A method of providing a structural shape comprising:
- a. introducing dry waste paper into an operating hammer mill to make dry paper fibers;
- b. withdrawing said dry paper fibers from said mill;
- c. passing said dry paper fibers through a screen;
- d. mixing said dry paper fibers with a thermosetting resin binder in water in the proportion by weight of paper fibers of from about 3-35% water and from 3-35% binder;
- e. pressing the mixture at a pressure of from 3-600 psi while permitting said water to escape, and;
- f. heating said mixture while under said pressure to a temperature of 250.degree.-375.degree.F. for from three to thirty minutes to cure said resin binder and thereby form said structural shape.
A method of providing a structural shape comprising:
- a. introducing dry waste paper into an operating hammer mill to make dry paper fibers;
- b. withdrawing said dry paper fibers from said mill;
- c. passing said dry paper fibers through a screen;
- d. mixing said dry paper fibers with a thermosetting resin foaming binder in dry form in the proportions by weight of about 400 grams of paper fiber and 50 grams of binder;
- e. pressing the dry mixture at a pressure of 5-400 psi;
- and,
- f. heating said mixture while under said pressure to a temperature of about 350.degree.F. for three minutes to three hours to cure said resin binder and thereby form said structural shape.
Dependencies are inferred from the claim text.