Cap, mold and manufacturing method of cap

A mold comprising:

• a lower mold including a recess formed in a same shape as an outer shape of a top plate portion of a molded product constituting a cap body formed with the top plate portion and a skirt portion integrally provided with the top plate portion through a curved corner portion having an annular shape and an outer shape of at least a part of the corner portion;
• a first upper mold which has an outer diameter equal to an inner diameter of the skirt portion or capable of preventing inflow of a resin material, includes a flat chamfered portion at a ridge portion between an end surface and an outer peripheral surface, and molds 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;
• a second upper mold which has an outer diameter equal to the inner diameter of the skirt portion or capable of preventing inflow of a resin material, includes an end surface facing the lower mold, and molds a sealing layer of the sealing member 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.

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.