Abgestufte Kristallisation von Behälterabschlüssen

摘要

A container (20a), a container preform (20) and a method of making the container in which the finish of the preform or container is at least partially of crystallizable polymer construction, and has a first end portion (26) remote from the body of the preform or container, a second end portion (30) adjacent to the body of the preform or container, and amid portion (28) between the end portions. The first end portion of the finish forms an end surface (32), and the end and mid portions ofthe finish form continuous inner and outer surfaces (36,34) The polymer material in at least one of the end, inner and outer surfaces is crystallized, and crystallization in the finish in a direction perpendicular to such surface is graded from crystallization at the surface to an essential absence of crystallization at a position within the finish spaced from the surface.