Injection mold for producing spool
AssigneeFuji Photo Film Co., Ltd.
InventorTakashi Suzuki
Life of this patent
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Abstract
An injection mold for molding a spool with flanges at both ends of a shaft such that the inner wall surfaces of the flanges are not flawed, and the dimension between the flange inner wall surfaces is uniform and thus the flange inner wall surfaces are free from distortion, and further the cooling time is short and hence the molding cycle can be shortened. Two mold members for molding the outer periphery of the shaft of the spool and the inner wall surfaces of the flanges are formed of a material having relatively low thermal conductivity. A pair of mold members for molding the outer wall surfaces of the flanges are formed of a material having relatively high thermal conductivity at least at portions thereof that mold the outer wall surfaces of the flanges.
Claims7
An injection mold for molding a spool having flanges at both ends of a shaft, said flanges each having an inner wall surface with a groove therein, said groove being concentric with said shaft, said injection mold comprising:
- two mold members for molding an outer periphery of the shaft of said spool, said inner wall surfaces of said flanges, and said grooves;
- and
- a pair of mold members for molding outer wall surfaces of said flanges;
- wherein said two mold members for molding the outer periphery of the shaft of said spool, the inner wall surfaces of said flanges and the grooves are formed of a material having relatively low thermal conductivity, and said pair of mold members for molding the outer wall surfaces of said flanges are formed of a material having relatively high thermal conductivity at least at portions thereof that mold the outer wall surfaces of said flanges.
Dependencies are inferred from the claim text.