Production method for glass fiber-reinforced polyamide resin composition

A method for producing a glass fiber-reinforced polyamide resin composition pellet comprising extruding a glass fiber-reinforced polyamide resin composition with a twin screw extruder,

• wherein the glass fiber-reinforced polyamide resin composition comprises, relative to 100 mass % of the glass fiber-reinforced polyamide resin composition:
• 20 to 70 mass % of a polyamide resin (A);
• 10 to 75 mass % of a glass fiber (B);
• optionally, up to 40 mass % of another reinforcement material (C);
• and
• optionally, up to 30 mass % of another polymer or additive (D), and
• wherein
• a shear viscosity of the glass fiber-reinforced polyamide resin composition at a temperature of 280° C. and a shear rate of 91/sec is 400 to 2000 Pa·s,
• when a strand of the glass fiber-reinforced polyamide resin composition is extruded from a horizontal flat die provided in a die holder at a front end of the twin screw extruder, a temperature of the strand extruded from a die hole in a center of the flat die is 310° C. to 360° C., and
• Condition (i), Condition (ii) or both is satisfied:
• (i) a temperature of the strand extruded from a die hole at an end of the flat die is 4° C. to 14° C. lower than the temperature of the strand extruded from the die hole in the center of the flat die,
• (ii) the strand is extruded such that a resin pressure in the die when the strand is extruded from the flat die is 2.0 to 8.5 MPa.