本发明系关于一种聚酯容器，该聚酯容器从聚酯预型物制造而成，该等预型物较佳地在预型物外部表面至少一部份上具有一热塑包复成型层。该预型物的制造系将该热塑层以一个或多个包复成型进程包复成型在预型物表面上。在一单一包复成型具体实施例当中，该预型物具有一属于第一颜色的体层和一属于第二颜色的包复成型层。该包复成型层可具有一厚度梯度，亦即从预型物一末端到预型物相邻另一末端变化厚度。这将给予吹塑容器一独特的外表，使得该容器系实质上透明或属于一第一颜色，而该等包复成型层具有不同的颜色。该等包复成型层可具有一厚度和颜色梯度。一第三颜色会由于第一颜色和该等包复成型层不同颜色相混合而得到，使得该第一颜色和该等不同颜色两者皆可被感知。所以导致一第一颜色在一末端，一第二颜色在另一末端，而在一末端和另一末端之间一第三颜色变化混合。当该容器系实质上透明时，被容纳之液体的颜色同样可增加颜色混合。

The invention is directed to polyester containers that are produced from polyester preforms, the preforms preferably having a thermoplastic over-mold layer on at least a part of the exterior surface of the preform. The preform is made by over-molding the thermoplastic layer onto the preform surface in one or more over-molding operations. In a single over-molding embodiment the preform has a body layer of a first color and the over-molded layer of a second color. The over-mold layer can have a thickness gradient varying in thickness from one end of the preform to adjacent another end of the preform. This will give the blow molded container a unique appearance there the container will be substantially transparent or of a first color and the over-mold layers of differing colors. The over-mold layers can have a thickness and color gradient. A third color will result from the blending of the first color and the differing colors of the over-molded layers where the first color and the differing colors can both be perceived. There can result only a first color at one end and a second color at another end with a third color varying blend intermediate between the one end and the another end. The color of the contained liquid can also add to the color mixing when the container is substantially transparent.