METHOD OF MANUFACTURING GLASS VESSEL, AND APPARATUS FOR MANUFACTURING GLASS VESSEL
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United States of America Patent
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Issued Date -
Dec 6, 2018
app pub date -
May 30, 2018
filing date -
May 30, 2018
priority date (Note) -
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Abstract
A method of producing a glass vessel includes holding a borosilicate glass tube with a first holding device, and holding an open end portion of the glass tube with a second holding device such that the second holding device is spaced apart from the first holding device. Heat is applied to the glass tube by a burner to separate the open end portion and form a bottom portion on the open end portion. Fire-blast treatment of an inner surface of the open end portion with a flame from a point burner is performed during at least a part of (i) applying heat to the borosilicate glass tube for separation, (ii) applying heat to the separated open end portion for bottom portion formation, and/or (iii) a period applying heat to the separated open end portion and prior to releasing the glass vessel from the second holding device.
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