Thermoplastically moldable fiber reinforced planar semifinished products having a composite structure (A-B-A′) or (A-B) are produced by a method of applying to one or both sides of a flat, porous reinforcing-fiber thermoplastic material core layer precursor having an areal weight of 300 to 3,000 g/m.sup.2, a fiber content of 20 to 60 wt.-% and an air void content of 20 to 80 vol.-%, at least one woven or nonwoven reinforcing fiber fabric having an areal weight of 100 to 1,000 g/m.sup.2 and a thermoplastic layer having a low viscosity compared with the thermoplastic material of the core layer precursor and having an areal weight of 50 to 1,000 g/m.sup.2, and heating and pressing the layer structure formed such that the low viscosity thermoplastic layer is melted and penetrates into the applied woven or nonwoven reinforcing fiber fabric and into the core layer and, after cooling, forms an integral bond with the core layer and cover layer.

Thermoplastically moldable fiber reinforced planar semifinished products having a composite structure (A-B-A′) or (A-B) are produced by a method of applying to one or both sides of a flat, porous reinforcing-fiber thermoplastic material core layer precursor having an areal weight of 300 to 3,000 g/m.sup.2, a fiber content of 20 to 60 wt.-% and an air void content of 20 to 80 vol.-%, at least one woven or nonwoven reinforcing fiber fabric having an areal weight of 100 to 1,000 g/m.sup.2 and a thermoplastic layer having a low viscosity compared with the thermoplastic material of the core layer precursor and having an areal weight of 50 to 1,000 g/m.sup.2, and heating and pressing the layer structure formed such that the low viscosity thermoplastic layer is melted and penetrates into the applied woven or nonwoven reinforcing fiber fabric and into the core layer and, after cooling, forms an integral bond with the core layer and cover layer.

A high-temperature insulation for thermally insulating pipes includes a carrier layer, wound helically to form a tubular main body and has four or more windings, and has three or more different insulating layers. The inner winding circumferentially surrounds the inner cavity of the tubular main body. The circumference of the inner cavity is at least 50 mm. The insulating layers are arranged in the gaps between the windings of the carrier layer and contact the carrier layer both radially inwardly and radially outwardly. The insulating layers are arranged in the carrier layer have, along the circular path specified by the winding, a length that corresponds to at least 80% of the circumference of the inner cavity of the tubular main body. The carrier layer, the first insulating layer, the second insulating layer, and the third insulating layer each consist of different materials and/or thermal conductivities and/or temperature resistances.

A laminated door core for use in fire rated doors includes a center layer having a first side and an opposing second side, where the center layer comprises fire rated particleboard. The laminated door core also includes a first layer comprising calcium silicate adhered to the first side of the center layer, a second layer comprising calcium silicate adhered to the second side of the center layer, a first layer of high-density fiberboard adhered over the first layer of calcium silicate, and a second layer of high-density fiberboard adhered over the second layer of calcium silicate. A vertical stile may be positioned along each opposing longitudinal edge of the laminated door core, and a horizontal rail may be positioned along each of a top end and a bottom end of the laminated door core.

This insulating panel for an insulated air-flow casing comprises an inner sheet forming an inner wall, an outer sheet fastened to the inner sheet and forming an outer wall, a layer of insulating material placed between the inner and outer sheets, and a peripheral edge extending transversally between the inner wall and the outer wall. The peripheral edge comprises at least a first and a second rows of perforations, and the perforations of the second row are placed with respect to the first row of perforations in a staggered manner.

Structurally enhanced preformed layers of multiple rigid unidirectional rods are constructed and arranged for use in fabricating load-bearing support structures and reinforcements in a variety of composite components, e.g. wind turbine blades. Individual preform layers include multiple elongate unidirectional strength elements or rods arranged in a single layer along a longitudinal axis of the preform layer. Individual rods include aligned unidirectional structural fibers embedded within a matrix resin such that the rods have a substantially uniform distribution of fibers and high degree of fiber collimation. The relative straightness of the fibers and fiber collimation provide rods and the preform layers with high rigidity and significant compression strength. A plurality of rods are loosely attached, e.g. knitted, together with a coupling that allows for each rod to be axially displaced, e.g. slideable, relative to another rod.

A process for fabricating a unitized structure comprises creating a multilayer structure by applying a flame-retardant resin to a first layer and stacking, on the first layer, an intermediate layer comprising a honeycomb structure. Further, a second layer is stacked on the intermediate layer and the flame-retardant resin is applied to the second layer. The multilayer structure is then heated to a desired temperature and a pressure is applied about the multilayer structure for a predetermined process time. Moreover, the flame-retardant resin is prevented from entering spaces of the honeycomb structure. After elapse of the predetermined process time, the pressure is released, creating the unitized structure.

Fire-retardant panels that include: a frame with multiple holes that reduce heat conduction through the panel; or a frame that includes two portions separated by a layer of fire-resistant material (e.g., gypsum, calcium silicate, or gypsum board). Some embodiments include skins (e.g., sheet metal) or insulation (e.g., between skin and fire-resistant material, for instance, within the frame). In particular embodiments, the fire-resistant material is (e.g., midway) between: two skins, two layers of insulation, two portions of the frame, or a combination thereof. The portions of the frame can be: sheet metal, attached (e.g., screwed) to the skin(s) or to each other, or extend around the perimeter. The frame can include: various elongated members, (e.g., parallel) bends, or holes that are: in at least one row, elongated, or slots (e.g., parallel to each other or to the skin).

The embodiments of the present invention generally relate to i) paper and paperboard or molded products with improved abrasion resistance and/or taber stiffness, ii) methods for making paper and paperboard or molded products with improved abrasion resistance and/or taber stiffness, and iii) methods for improving abrasion resistance and/or taber stiffness paper and paperboard or molded products, by using a metal chelate, such as, Ammonium Zirconium Carbonate (AZC) or Potassium Zirconium Carbonate (PZC). Further advantages of the embodiments of the present invention will be readily apparent to the reader from this disclosure.

A fluid-filled chamber is provided and includes a first barrier layer, a second barrier layer attached to the first barrier layer and cooperating with the first barrier layer to define an interior void, and a third layer attached to one of the first barrier layer and the second barrier layer including mineral mica that provides the one of the first barrier layer and the second barrier layer with an iridescent appearance caused by differential refraction of light waves.