Manufacturing method and manufacturing apparatus of screw-threaded bottle-can
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United States of America Patent
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May 17, 2016
Grant Date -
Jan 15, 2015
app pub date -
Mar 19, 2013
filing date -
Mar 27, 2012
priority date (Note) -
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Abstract
A manufacturing method for a screw-threaded bottle-can including the steps of: forming a shoulder part, a pipe part, a tapered part and an aperture-end part above a trunk part; and forming a screw-thread part by an inner mold and an outer mold in which the pipe part is sandwiched therebetween. An outer diameter of the pipe part is formed to an intermediate diameter between a ridge diameter and a bottom diameter of the screw-thread part. The screw-thread part is formed from the tapered part to the pipe part so as to form a screw-starting part at an intermediate position of the tapered part. A height of a first step of a right-hand screw-type protrusion of the inner mold is formed to be lower than a height of a second and subsequent steps in an angle range of 90° circumferentially continuing from the screw-starting part.
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