Plastic preform and process for the manufacturing thereof to a polychromatic container

Abstract

Preform for the blow moulding of a container comprising a neck section () including a pouring opening (), an adjacent wall section () and a bottom section (). It consists of a primary plastic raw material in a primary area (A, A, A) and at least one secondary material in at least a secondary area (B, B, B) both having a mutually different coloration. Said preform is remarkable in that said bottom section () is composed of a multi-layer structure with primary layers composed of said primary plastic material, and additional secondary layers (). The latter are composed of said secondary material, two surface secondary layers the one of which () is directed outwardly respective the preform, whereas the other one () is directed inwardly, and an intermediate secondary layer between them (), which constitutes a core layer, which is located between two said primary layers. Said preform is in one single piece, the transition (Z, Z) from said primary to said secondary material being seamless and uninterrupted. The invention further relates to a manufacturing method of said preform.