Patent ID: 8617676
Filing Date: 2013-12-31
Classification: B29B,B29C,B29K,B29L,Y10T

Abstract:
1. A preform for producing plastic flasks in a two-stage stretch blow-molding process, comprising: a preform base; a neck portion with threaded sections or positive protrusions; an elongated preform body, including one longitudinal end sealed to the preform base and another longitudinal end sealed to the neck portion, wherein the preform is manufactured from a plastic that is suitable for a 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 an outside wall and an inside wall of the preform base delimit a flat divergent lens shape, and in each case have radii of curvature (c, b) that is 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 an area of the preform body.