A door includes a sandwich panel having first and second panels, and a honey comb core. The first and second panels have edge tabs foldable toward one another. There are inner frame sections disposed at edge sections of the sandwich panel and adjacent to the honey comb core and inwardly of the edge tabs. The edge tabs are folded toward one another over the inner frame sections.

A composite product includes gypsum in an amount of 70 to 90% by weight, fibers in an amount of 1.5 to 26% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight. The composite is caused or allowed to cure to form a cured composite. The cured composite is a fire resistant component used in a fire-rated door core, a fire-rated door or a fire-rated building panel. The fire resistant component may include a building panel, a door panel, a door core, a door rail, a door stile, a door lock block, a door border, or a door insert.

The present invention relates to a double backbone core for automated hollow door manufacture and a door comprising same. The double backbone core comprises an expandable core component comprising two backbones with relatively smaller cells running parallel to one another along the length dimension of the door, wherein the core is formed from a plurality of interconnected strips.

Doors, systems and methods of making the same are described, including use of an adhesive that is capable of achieving green strength in a predetermined time, including for exemplary automated embodiments, to prevent movement of the components relative to each other.

Half doors, doors, systems and methods of making the same are described, including use of an adhesive that is capable of achieving green strength in a predetermined time, including for exemplary automated embodiments, to prevent movement of the components relative to each other.

Barriers may utilize cores that may be pre-assembled and dropped into a barrier or may be formed within the barriers. The cores may include traditional core materials, biomass materials, graphite polystyrene (GPS) material, or other types of materials. The core may be formed from one or more layers, such as one or more stiffener layers (e.g., stiffener panel, stiffener rods, or the like), one or more matrix layers (e.g., with apertures extending therein), one or more solid layers (e.g., wood, plastic, composite, foam, fiber, or the like), one or more fluid sealed layers (e.g., air, argon, nitrogen, or other like), and/or other types of layers. The barrier edge members, the faces, and/or the core layers described herein may be assembled to each other in traditional ways, such as welding, and/or may be assembled to each other in a way that reduces the amount of welding and/or use of steel.

The present invention relates to a double backbone core for automated hollow door manufacture and a door comprising same. The double backbone core comprises an expandable core component comprising two backbones with relatively smaller cells running parallel to one another along the length dimension of the door, wherein the core is formed from a plurality of interconnected strips.

A fire rated door includes a core, a first decorative panel and a second decorative panel. The core includes: (a) a fire resistant center panel having a bottom, a top, a first side, a second side, a first end and a second end, wherein the fire resistant center panel is made of a first fire resistant material, and (b) an extruded fire resistant border attached to the first side, the second side, the first end and the second end of the fire resistant center panel, wherein the extruded fire resistant border is made of a second fire resistant material having a higher density than the first fire resistant material. The first decorative panel is attached to the top of the fire resistant center panel and the extruded fire resistant border. The second decorative panel is attached to the bottom of the fire resistant center panel and the extruded fire resistant border.

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.

A door includes a sandwich panel having first and second panels, and a honey comb core. The first and second panels have edge tabs foldable toward one another. There are inner frame sections disposed at edge sections of the sandwich panel and adjacent to the honey comb core and inwardly of the edge tabs. The edge tabs are folded toward one another over the inner frame sections.