Patent ID: 11905073
Assignee: DAIWA CAN COMPANY
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 6:
7. A manufacturing method of a cap, comprising:
arranging a molded product in a recess of a lower mold, the molded product constituting a cap body formed with a top plate portion and a skirt portion integrally provided with the top plate portion through a curved corner portion having an annular shape, and the recess formed in a same shape as an outer shape of the top plate portion of the molded product and an outer shape of at least a part of the corner portion;
supplying a first resin material to the top plate portion;
molding the first resin material by a first upper mold having an outer diameter equal to an inner diameter of the skirt portion and including a flat chamfered portion at a ridge portion between an end surface and an outer peripheral surface to form a sliding layer of a sealing member provided separately from the cap body, the flat chamfered portion forming a protrusion portion, the protrusion portion being an annular protruding shape inclined with respect to an axial direction of the sliding layer;
supplying a second resin material to the sliding layer;
molding the second resin material by a second upper mold having an outer diameter equal to the inner diameter of the skirt portion and including an end surface facing the lower mold to form a sealing layer onto and covering at least a portion of the protrusion portion of the sliding layer; and
wherein an outer diameter of the sealing member is either the same as an outer diameter of the sliding layer or larger than an outer diameter of the sliding layer.