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公开(公告)号：US20210252847A1
公开(公告)日：2021-08-19
申请号：US17273595
申请日：2020-02-03
发明人： Takashi Kagawa , Akira Murayama
摘要： A manufacturing method comprises: a printing step printing on an outer peripheral surface of a cylinder part of a cylinder body; a necking step deforming the cylinder body after the printing step to form a tapered part in which a diameter is reduced upward from the cylinder part and a small-diameter part extending to an upper side of the tapered part; and a mouth part forming step deforming the small-diameter part to form the mouth part including a swelled part and a male thread part. In the printing step, ink is coated on a third coating region to be the cylinder part, a fourth coating region to be the tapered part, and a first coating region to be the swelled part. An apply amount of the ink per unit area on the first coating region is less than that of the ink per unit on the third coating region.
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