a method for adding intact fiber reinforcing material into thermoplastic resin compositions for toughening purposes without breakage of the fibers , including blending a polymeric solution and chopped fibers in a mixture at low to medium shear , injecting the resulting mixture into an extruder with a resin to be reinforced at an entry point positioned very near a vacuum point , and then removing the solvent for recycle while the reinforcing glass fiber and polymer blend is extruded .