GRADED CRYSTALLIZATION OF CONTAINER FINISHES

摘要

A container, a container preform and a method of making the container or preform in which the finish of the preform or container is at least partially of crystallizable polymer construction, and has an end portion remote from the body of the preform or container, a second end portion adjacent to the body of the preform or container, and a mid portion between the end portion The end portion of the finish forms an end surface, and the end and mid portions of the finish form continuous inner and outer surfaces. 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 essentia l absence of crystallization at a position within the finish spaced from the surface.