Preform with a concave bottom and an evolving thickness
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United States of America Patent
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Jan 5, 2021
Grant Date -
Dec 20, 2018
app pub date -
Nov 17, 2016
filing date -
Dec 16, 2015
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Abstract
Disclosed is a preform for a plastics container, which includes: a rotationally symmetrical body about a central axis; an open neck which extends in continuation of the body from an upper end of the latter; a bottom which closes the body starting from a lower end of the latter, the bottom being rotationally symmetrical about the central axis and having a central concavity and a protruding bulge around this concavity, the bottom having a thickness E, measured from an external face, that is variable in accordance with three different criteria respectively applied to three sections of the bottom, namely a central section [0; S1], an intermediate section [S1; S2] and a peripheral section [S2; L].
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