INJECTION-STRETCH-BLOW-MOLDING (ISBM) MANUFACTURING METHOD OF A HOTFILL PLASTIC CONTAINER AND HOTFILLING PROCESS THEREOF

摘要

The invention intends to provide an improved Injection-Stretch-Blow-Molding (ISBM) manufacturing method of a hotfill plastic container which is not a heat set process. This method makes it possible to increase the crystallinity of the bottle without heating the blow-molding mold and/or without impairing or impacting the hot fill process cost effective and which is easy to manufacture at an industrial scale. The invention concerns an ISBM manufacturing method of a hotfill plastic container, made from a polymer material having a crystallization temperature Tc – preferably a PET-consisting essentially in heating and blow-molding a preform in a mold said container: i. Providing a plastic preform comprising a neck end, a neck support ring, and a closed tubular body portion which is defined by a wall with an external face and an internal face, having respectively an external Te and an internal Ti temperature; ii. Heating the preform in order that Ti > Tewhile entering the mold; Ti & Te ≥ Tg;and Tg < Ti < Tc; iii. Optionally letting the heat diffusing and stabilizing itself in the preform, the heating of said preform being stopped during this possible step iii; iv. Blow molding the preform in a cavity of a mold so as to form a container, at least a part of the said mold having a TM temperature