Patent ID: 9415531
Filing Date: 2016-08-16
CPC Classification: B29B,B29C,B29D,B29K,B29L

Claim Text:
1. A method for producing a preform with an optimized base geometry, comprising: producing a finished preform from at least one injection-molded thermoplastic material that has a substantially thinner wall thickness in a domed end region of the preform than in a preform shaft and the wall thickness of the preform gradually becoming equal in the progression from a gate to the preform shaft, the preform being intended for re-shaping into blow-molded containers; opening a mold after solidifying of an outer skin of the preform after first intensive cooling; taking up the preforms from the open mold by a removal arm and cooling sleeves of the removal arm, the cooling sleeves cooling the preform shaft, but not the domed region, by contact cooling before an embossing operation; correspondingly mechanically deforming, in dependence on cooling sleeve geometry, the still plastically deformable domed region reproducibly by an embossing body, a contour of the cooling sleeve and of the embossing body being designed so that these contours are to a greatest extent replicated reproducibly on the demolded preform after the deforming operation; and, after the mechanically deforming, cooling the domed end region by wall contact of the cooling sleeves, wherein a geometrically determined embossing mandrel of the embossing body; and with a vent in combination with a geometrically determined base contour of the cooling sleeve deforms the polymer in a plastic state of the domed end region by pulling, pressing and pushing of the thermoplastic compound until a volume between the two contours is at least substantially filled with polymer and thereby limits a embossing stroke.