This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.

A filament is fed to an extrusion head. The filament has a semi-crystalline polymeric reinforcement portion and a polymeric matrix portion. The reinforcement and matrix portions run continuously along a length of the filament. The reinforcement portion has a higher melting point and a higher crystallinity than the matrix portion. The temperature of the filament is raised in the extrusion head above the melting point of the matrix portion but below the melting point of the reinforcement portion so that the matrix portion of the filament melts within the extrusion head, thereby forming a partially molten filament within the extrusion head. The partially molten filament is extruded from the extrusion head onto a substrate, the reinforcement portion of the partially molten filament remaining in a semi-crystalline state as it is extruded from the extrusion head. Relative movement is generated between the extrusion head and the substrate as the partially molten filament is extruded onto the substrate in order to form an extruded line on the substrate. The matrix portion of the extruded line solidifies after the extruded line has been formed on the substrate.

A hand-held three-dimensional drawing device can include an anti-rotation mechanism that can restrict rotation of a filament moving through the device. The anti-rotation mechanism can have a filament-engaging component in a passage of the anti-rotation mechanism and positioned to engage and restrict rotation a filament extending through the passage. The drawing device can also include a moveable member to control an operation of the drawing device. The moveable member can include a rotatable control mechanism including a portion of an outer profile of a housing of the device. Finally, the drawing device can also include a cover member comprising a portion of an outer profile of housing of the device and positioned adjacent to an actuator to control an operation of the device.

An extruder and a long fiber thermoplastic (LFT) extrusion member manufactured thereby, and the extruder uses the LFT as a raw material to produce LFT extrusion members such as LFT sheets, pipes and profiles by a continuous extrusion molding process. The structural improvement of the extruder screw, including the screw body having three different thread groove deep sections, in sequence, a feed section, a compression section and a metering section, so that the LFT extrusion member produced by the extruder has high strength, high stiffness, high dimensional stability, low warpage and resistance to creep.

A system for producing a homogenous extrudate powder coating composition having predetermined properties, the system comprising a color library database that is configured to store one or more input formulation data objects capable of use in controlling the inputs and operation of an electronically controlled homogenous extrudate mixer.

An article includes a body, which includes a thermoplastic or thermoset material and a plurality of metallic fibers distributed throughout the thermoplastic or thermoset material and has a first subset of the plurality of metallic fibers extending onto a first surface of the body. The manufactured article includes a metallic coating metallically bonded to the first subset of the plurality of metallic fibers. The metal fibers extending onto the first surface are configured to bond with the metallic coating.

A manufacturing method of a halogen-free flame-retardant thermoplastic braided fiber reinforced polymer composite board, comprising steps of: preparing a recycled material containing a halogen-free flame-retardant thermoplastic braided fiber reinforced polymer composite; adding a polymer base material to the recycled material to form a core layer material and extruding the core layer material with a low shear extruder; hot pressing the core layer material by rollers to obtain a recycled fiber core layer; preparing a reinforcement layer containing a fiber material or a fabric with pores; and stacking and hot pressing the recycled fiber core layer and the reinforcement layer.

An advanced siding panel that combines a traditional siding appearance with improved insulation, structural integrity, and improved thermal characteristics.

A composition that includes: (a) from 65 to 85% by weight of polypropylene homopolymer in powder form, the average particle size of which is micrometric, (b) from 14 to 30% by weight, preferably 14 to 25% by weight, of natural fibers less than or equal to 2 mm in length, and (c) from 1 to 3% by weight of compatibilizer, its uses for the preparation of a composite material by extrusion, wherein this composite material is useful for preparing a part by injection, in particular a vehicle part whose rigidity is improved.

A method for forming a graphene-reinforced polymer matrix composite is disclosed. The method includes distributing graphite microparticles into a molten thermoplastic polymer phase; and applying a succession of shear strain events to the molten polymer phase so that the molten polymer phase exfoliates the graphite successively with each event until at least 50% of the graphite is exfoliated to form a distribution in the molten polymer phase of single- and multi-layer graphene nanoparticles less than 50 nanometers thick along the c-axis direction.