The present invention relates to methods of producing polymer fibers and polymer fiber products and materials recovery from these processes. It is an object of this invention to produce polymer fibers and products that include these fibers using selective dissolution of multicomponent fiber and to recover the dissolved polymer and solvent for subsequent use.

An integrated and improved process for the production of acrylic fibers is described, specifically a process that starts from the comonomers and reaches the spinning step obtaining the final fiber.

The present invention relates to methods of producing polymer fibers and polymer fiber products and materials recovery from these processes. It is an object of this invention to produce polymer fibers and products that include these fibers using selective dissolution of multicomponent fiber and to recover the dissolved polymer and solvent for subsequent use.

The present invention relates to methods of producing polymer fibers and polymer fiber products and materials recovery from these processes. It is an object of this invention to produce polymer fibers and products that include these fibers using selective dissolution of multicomponent fiber and to recover the dissolved polymer and solvent for subsequent use.

A filament fibre production method including the process steps of: filtration of and/or applying evaporation process to wastewater containing Polyvinyl alcohol polymer from sizing process and/or painting process in a manner to contain Polyvinyl alcohol polymer at rate of 20-30% by mass, adding Carbonyl di-imidazole and Ethylenediamine or 4-chloro-Propionyl chloride and Etylendiamine into wastewater having Polyvinyl alcohol polymer in 20-30% rate as a result of filtration and/or evaporation process and obtaining PVA-Etylendiamine hydrogel solvent, adding dimethyl sulfoxide, Boric Acid, Acetic Acid and surface active agent into solvent bath containing PVA-Ethylendiamine hydrogel solvent at 20-30% rate, applying coagulation process to obtained PVA-Ethylendiamine hydrogel solvent with acetone of critic fluid phase, stretching Polyvinyl alcohol polymer passing through coagulation bath at 200 C.°-250 C.° temperature range when wet, and subjecting to fixing process.

A filament fibre production method including the process steps of: filtration of and/or applying evaporation process to wastewater containing Polyvinyl alcohol polymer from sizing process and/or painting process in a manner to contain Polyvinyl alcohol polymer at rate of 20-30% by mass, adding Carbonyl di-imidazole and Ethylenediamine or 4-chloro-Propionyl chloride and Etylendiamine into wastewater having Polyvinyl alcohol polymer in 20-30% rate as a result of filtration and/or evaporation process and obtaining PVA-Etylendiamine hydrogel solvent, adding dimethyl sulfoxide, Boric Acid, Acetic Acid and surface active agent into solvent bath containing PVA-Ethylendiamine hydrogel solvent at 20-30% rate, applying coagulation process to obtained PVA-Ethylendiamine hydrogel solvent with acetone of critic fluid phase, stretching Polyvinyl alcohol polymer passing through coagulation bath at 200 C.°-250 C.° temperature range when wet, and subjecting to fixing process.

An embodiment is a method of recycling carbon fibers that includes: preparing a carbon fiber reinforced plastic formed product that includes a carbon fiber reinforced plastic containing a carbon fiber and a resin; thermally decomposing or dissolving the resin in the carbon fiber reinforced plastic formed product by a first heating process or a first dissolving process; and winding while drawing the carbon fiber from the carbon fiber reinforced plastic formed product after the first heating process or the first dissolving process. The winding further includes thermally decomposing or dissolving a residue of the resin attached to the carbon fiber by a second heating process or a second dissolving process and adding a sizing agent to the carbon fiber after the second heating process or the second dissolving process.

An embodiment is a method of recycling carbon fibers that includes: preparing a carbon fiber reinforced plastic formed product that includes a carbon fiber reinforced plastic containing a carbon fiber and a resin; thermally decomposing or dissolving the resin in the carbon fiber reinforced plastic formed product by a first heating process or a first dissolving process; and winding while drawing the carbon fiber from the carbon fiber reinforced plastic formed product after the first heating process or the first dissolving process. The winding further includes thermally decomposing or dissolving a residue of the resin attached to the carbon fiber by a second heating process or a second dissolving process and adding a sizing agent to the carbon fiber after the second heating process or the second dissolving process.

The disclosed method relates to a method of recycling high relative viscosity nylon. The process involves melting a base polyamide with a dry blended mixture of dicarboxylic acid and a second polyamide. The disclosed method provides a process of controlling the relative viscosity of the combined polyamides and, in various aspects, the second polyamide may be nylon plop or other polyamide having high relative viscosity.

The disclosed method relates to a method of recycling high relative viscosity nylon. The process involves melting a base polyamide with a dry blended mixture of dicarboxylic acid and a second polyamide. The disclosed method provides a process of controlling the relative viscosity of the combined polyamides and, in various aspects, the second polyamide may be nylon plop or other polyamide having high relative viscosity.