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

Preform for the blow moulding of a container comprising a pouring opening, a neck section, an adjacent wall section, and a bottom section opposite to the neck section as supporting base of the produced container, wherein the preform is composed of a primary area, and at least one secondary area, wherein said primary area consists of a primary plastic material, said at least one secondary area consisting of at least one secondary material, wherein said primary and secondary areas have a mutually different coloration, wherein at least a part of said bottom section is composed of a multi-layer structure having primary layers composed of said primary plastic material, and additional secondary layers composed of the said at least one secondary material, which include two surface layers the one of which is directed outwardly respective the preform, whereas the other one is directed inwardly, with an intermediate secondary layer located in between, thereby constituting a core layer, which is further located between two said primary layers, and wherein said preform consists in one single piece, the transition from said primary to said secondary area or areas being seamless, and wherein the primary material constitutes the complete volume of the wall and neck section.

A method comprising forming a preform for blow moulding of a container, further comprising forming a pouring opening, a neck section, an adjacent wall section and a bottom section opposite to the neck section as supporting base of the container, forming the adjacent wall section of the preform with a primary area, and forming the bottom section with at least one secondary area, said primary area having a primary plastic material, and the at least one secondary area having at least one secondary material, the primary and secondary areas having a mutually different coloration, wherein at least a part of said bottom section is formed of a multi-layer structure having primary layers composed of said primary plastic material which is colored, and secondary layers composed of the said at least one secondary material, which is colored differently than the primary layers, wherein the bottom section multi-layer structure has two surface layers, one of the two surface layers is directed outwardly respective the preform, whereas the other one of the surface layers is directed inwardly, with the secondary layers located in between, thereby constituting core layers, which are located between two said primary layers, and in that said preform consists in one single piece, thereby producing special color effects in the container and contents of the container blow molded from the preform.