Preform for producing plastic containers in a two-stage stretch blow-moulding process
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United States of America Patent
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Dec 31, 2013
Grant Date -
Sep 13, 2012
app pub date -
May 23, 2012
filing date -
Dec 23, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A preform is disclosed for producing plastic flasks in a two-stage stretch blow-molding process, including a preform base, an elongated preform body, including one longitudinal end sealed to the preform base and another longitudinal end sealed to the neck portion a neck portion with threaded sections or positive protrusions, wherein the preform is manufactured from a plastic that is suitable for the stretch blow-molding process, which has a refractive index of 1.3 to 1.6 at a temperature of 10° C. to 120° C., and in that an outside wall and an inside wall of the preform base bound a flat divergent lens, and in each case have radii of curvature (c, b) that are larger by at least a factor 1.4 than a related radius of curvature (s) of an outside wall or a radius of curvature (R) of an inside wall of the preform in the area of the preform body.
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