Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: Disclosed are a multilayer prepreg structure and a method of manufacturing the same. The multilayer prepreg structure includes a prepreg layer formed by impregnating a carbon fiber fabric with a first resin, and a fixed layer formed of a second resin having a higher curing rate than the first resin and provided on one surface of the prepreg layer.

Abstract: Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Abstract: Disclosed herein is a composite piston pin including a pipe-shaped outer layer made of reinforced fibers; an inner layer coupled to the outer layer along an inner surface of the outer layer, and made of reinforced fibers having lower elasticity than the outer layer; and a resin material including an epoxy resin composition and cyanate ester, and impregnated into the reinforced fibers of the outer layer and the inner layer.

Abstract: Disclosed is a method of recovering reinforcement fibers from a fiber-reinforced part that includes the reinforcement fibers and is impregnated with resin. The method includes unwinding the reinforcement fibers from the fiber-reinforced part, dissolving the resin impregnated in the fiber-reinforced part, coating the resin-free reinforcement fiber with a sizing agent, and winding the sizing agent-coated reinforcement fibers around a mandrel.

Abstract: Disclosed is a method for manufacturing a composite reinforcement member, comprising: an impregnation step of impregnating a resin into reinforcement fibers withdrawn from a plurality of creels; a non-uniform distribution step of passing the resin-impregnated reinforcement fibers through a guide to adjust spaces among the reinforcement fibers in such a manner that the reinforcement fibers are distributed at different densities per area according to regions of the cross section of the composite reinforcement member; a forming step of directing the reinforcement fibers into a mold from the guide; and a curing step of curing the resin impregnated into the reinforcement fibers emerging from the mold.

Abstract: Disclosed is a method for manufacturing a soundproofing material by finely crushing a discarded car seat, mixing the crushed car seat with polyester fiber, low-melting polyester fiber such as LM PET, polypropylene fiber and hemp, and carding the resulting mixture, and a soundproofing material composition prepared thereby. The disclosed method allows recycling of polyurethane foam of the discarded car seat into a soundproofing material composition having superior appearance quality and soundproofing performance. The disclosed method also prevents generation of excessive static electricity and allows preparation of a soundproofing material with smooth surface.

Abstract: The present invention provides an apparatus for selectively separating polyurethane foam and fiber from Automobile Shredder Residue (ASR). The apparatus includes a first separator, a second separator, and a third separator. The first separator primarily separates fine particles, such as dirt or glass pieces, from the ASR at a front portion thereof and separates large-sized polyurethane foam and fiber from the ASR at a rear portion thereof. The second separator grinds remaining materials after the primary separation of the first separator. The third separator separates medium-sized polyurethane foam and fiber from the remaining materials after the separation of the first separator and secondarily separates plastics, rubber, and other materials.

Abstract: Disclosed is a soundproof material fabricated using recycled polyurethane foam from waste seats and a process of fabricating the same, and more particularly, a soundproof material fabricated by stacking a thermoplastic polymer on a sound absorbing material including recycled polyurethane foam from seats from end-of-life vehicles and a process of fabricating the same. Use of recycled resources provides an eco-friendly impact, reduces manufacturing costs for parts, and allows for improved mechanical rigidity and sound insulating properties. The soundproof material may be applied to various automobile parts such as package trays, luggage coverings, covering shelves, and isolation pads.

Abstract: The present invention provides an apparatus for selectively separating polyurethane foam and fiber from Automobile Shredder Residue (ASR). The apparatus includes a first separator, a second separator, and a third separator. The first separator primarily separates fine particles, such as dirt or glass pieces, from the ASR at a front portion thereof and separates large-sized polyurethane foam and fiber from the ASR at a rear portion thereof. The second separator grinds remaining materials after the primary separation of the first separator. The third separator separates medium-sized polyurethane foam and fiber from the remaining materials after the separation of the first separator and secondarily separates plastics, rubber, and other materials.

Abstract: Disclosed is a method for manufacturing a soundproofing material by finely crushing a discarded car seat, mixing the crushed car seat with polyester fiber, low-melting polyester fiber such as LM PET, polypropylene fiber and hemp, and carding the resulting mixture, and a soundproofing material composition prepared thereby. The disclosed method allows recycling of polyurethane foam of the discarded car seat into a soundproofing material composition having superior appearance quality and soundproofing performance. The disclosed method also prevents generation of excessive static electricity and allows preparation of a soundproofing material with smooth surface.