Disclosed herein are drum shells and methods of forming drum shells with plies that are individually scarfed, or with combinations of plies that are scarfed separately from one or more other plies. In some embodiments, the radial location of the joints of the plies can be varied around the drum shell, resulting in the removal of an inherent weak point in traditionally formed drum shells where all plies have a joint at approximately the same radial position.

Systems and methods for manufacturing plywood are provided. Aspects include receiving a face sheet, the face sheet having a grain oriented in a first direction and applying a first layer of adhesive to the face sheet. Aspects also include placing one or more pieces of stitched core material on the first layer of adhesive, the one or more pieces of stitched core material having a grain oriented in a direction offset from the first direction. Aspects further include applying a second layer of adhesive to the one or more pieces of stitched core material and placing a back sheet on the second layer of adhesive. Aspects also include pressing the face sheet, the one or more pieces of stitched core material, and the back sheet in a heated press.

Systems and methods for manufacturing plywood are provided. Aspects include receiving a face sheet, the face sheet having a grain oriented in a first direction and applying a first layer of adhesive to the face sheet. Aspects also include placing one or more pieces of stitched core material on the first layer of adhesive, the one or more pieces of stitched core material having a grain oriented in a direction offset from the first direction. Aspects further include applying a second layer of adhesive to the one or more pieces of stitched core material and placing a back sheet on the second layer of adhesive. Aspects also include pressing the face sheet, the one or more pieces of stitched core material, and the back sheet in a heated press.

A method for manufacturing a three-dimensionally deformed plate made of a wood fiber material comprises providing a prefabricated, flat wood fiber material plate as the original plate, preheating the original plate in sections, wetting the preheated section of the original plate with an atomized liquid mixture of water and a separating agent, introducing a section of the original plate that is preheated and wetted with a liquid mixture of water and a separating agent between two rollers of a molding station, wherein the rollers respectively provide a corrugated profile in the peripheral direction of the external surface, such that the original plate is being deformed in sections into a plate with a wave shape, wherein rollers are being used, the respective profiling of which has half-waves which follow one another in the peripheral direction and which at least partially have a different extension in the peripheral direction.

A core layer suitable for a multilayer composite including at least one surface layer and one core layer, the surface layer arranged to at least partially cover the core layer and be fixedly connected thereto, wherein the core layer has elements composed of wood, which elements have plate-like regions arranged in zig-zag-shaped fashion, wherein a plate-like zig region of an element with an adjoining plate-like zag region of the element form a common edge between them, in such a way that the wood element of zig-zag-shaped form is formed, wherein elements of zig-zag-shaped form are arranged in the core layer such that two such edges of two different elements cross one another at a non-zero angle, and wherein the two elements are fixedly connected to one another at the crossing point. In one embodiment, a wood element of zig-zag-shaped form may be adhesively bonded to a planar wood element.

This disclosure provides a plywood article that is pre-cured or cured. The plywood includes a first wood veneer, a second wood veneer disposed opposite the first wood veneer and an adhesive composition disposed between the first wood veneer and the second wood veneer. The adhesive composition is either cured or not cured. Prior to cure, the adhesive composition consists essentially of an isocyanate component and Kaolin. After cure, the cured adhesive composition consists essentially of a self-polymerization product of the isocyanate component and the Kaolin. The Kaolin is present in an amount of from greater than 10 to 50 weight percent based on a total weight of the adhesive composition. Moreover, each of the first and second wood veneers independently has a moisture content of from 0 to 45 weight percent.

This disclosure provides a plywood article that is pre-cured or cured. The plywood includes a first wood veneer, a second wood veneer disposed opposite the first wood veneer and an adhesive composition disposed between the first wood veneer and the second wood veneer. The adhesive composition is either cured or not cured. Prior to cure, the adhesive composition consists essentially of an isocyanate component and Kaolin. After cure, the cured adhesive composition consists essentially of a self-polymerization product of the isocyanate component and the Kaolin. The Kaolin is present in an amount of from greater than 10 to 50 weight percent based on a total weight of the adhesive composition. Moreover, each of the first and second wood veneers independently has a moisture content of from 0 to 45 weight percent.

A method of producing a semi-product for a building panel, wherein the method includes the step of: arranging at least two distance strips, on a first sawn timber board; arranging a second saw timber board to the distance strips; applying a glue; positioning of the first and the second sawn timber board and the distance strips by applying a pressure; and applying a pressure on the first and the second sawn timber board by a third and a fourth element, in a direction perpendicular to a top surface of the second sawn timber board, until the distance strips is bonded by the glue to the first and the second sawn timber board and thereby obtaining a solid batch; and cutting of said solid batch in the length direction of the first and the second timber boards.

A method of producing a semi-product for a building panel, wherein the method includes the step of: arranging at least two distance strips, on a first sawn timber board; arranging a second saw timber board to the distance strips; applying a glue; positioning of the first and the second sawn timber board and the distance strips by applying a pressure; and applying a pressure on the first and the second sawn timber board by a third and a fourth element, in a direction perpendicular to a top surface of the second sawn timber board, until the distance strips is bonded by the glue to the first and the second sawn timber board and thereby obtaining a solid batch; and cutting of said solid batch in the length direction of the first and the second timber boards.

A system for manufacturing a three-dimensionally deformed plate made of a wood fiber material comprises a preheating station, a wetting device, and a molding station including two rollers spaced apart for receipt of a preheated and wetted flat wood fiber material plate therebetween. The rollers respectively include an external surface including a wave-shaped profiling in the peripheral direction, wherein the respective profiling has half-waves which follow one another in the peripheral direction, and which have a different extension in the peripheral direction