The Celotex Corporation

William E Betzner

Richard K Holtman

Allen Ray Hill

Fred L Migliorini

A process of producing an asphalt-impregnated fiberboard comprises the steps of forming an aqueous slurry of a fibrous material and asphalt, the solids content of the slurry being less than about 8 weight percent, mixing the slurry to uniformly distribute its components, dewatering the slurry to form a wet mat, pressing the wet mat to consolidate it, and drying the consolidated wet mat. Fiberboards made by the process can be employed as durable resilient expansion joints between various types of structural members.

Process for making expansion joint material

A method of making an embossed gypsum panel including an embossing device mounted on a moveable support and positioning the device so that it is located at the point of 'set' of the gypsum slurry from which the board is made.

Method for producing an embossed gypsum panel

An apparatus for making an embossed gypsum panel on a conveyor including an embossing device mounted on a movable device such that the embossing device can be moved to the optimum location for embossing.

Apparatus for making an embossed gypsum panel

A method and apparatus for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a thermosettable binder, preferably a polyisocyanate binder, is applied through a cooled nozzle to the hot and wet fibrous material in the blow line out of the refiner of a board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.

Apparatus for blow line addition of thermosettable binder in fiberboard

A method for producing a synthetic board from cellulosic and/or lignocellulosic materials wherein a polyisocyanate binder is applied to the hot and wet fibrous material in the blow line out of the refiner of the board forming process. Polyphenylpolyisocyanates, such as a mixture of diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanates, are a particularly suitable binder.

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St. Petersburg, FL, United States of America

William E Betzner