PURPOSE: To enhance the fluidity of molten resin and prevent the resin from stagnating and sticking by burning by a method wherein the surface of the flow passage of the molten resin is formed by polishing the inner peripheral surface of a die through the running of free abrasive grains and, in addition, the unevenness of the surface after the polishing is directed to the flowing direction of the resin by bringing the running direction of the abrasive grains in line with the flowing direction of the resin.
CONSTITUTION: In a die main body stock, a hole corresponding to the flow passage 4 of molten resin is formed by machining. Next, by employing high hardness abrasive grain-containing vitrified grinding wheel or the like, the portion forming the surface 5 of the flow passage in the hole is rough-polished so as to have the surface roughness of about Rmax 1 to 1.5 S. After that, high hardness abrasive grains held in free state by compound water solution or proper organic medium are moved under pressure toward the flowing direction of molten resin along the surface 5 of the flow passage so as to finishpolish the surface 5. By polishing the surface 5 as mentioned above, the polished texture can be put in line with the flowing direction of the resin, resulting in allowing to remarkably reduce the fluid frictional resistance of the molten resin to the surface of the flow passage.
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UMEDA KOICHI
KUSABE ICHIRO
MINAMIDE TOSHIYUKI
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