| 摘要 |
Improved pre-forms for Flair and Flair-type applications are presented. In exemplary embodiments of the present invention, if two different materials which do not bond together are used to make a pre-form, then such a pre-form can be made by a bi- injection process, using the same mold. In such exemplary embodiments, first the outer pre-form can be fashioned, and then the inner pre-form can be molded through a center hole provided at the bottom of the outer pre-form. The two pre-forms are then connected to each other. The two materials can be different, such as PET and a polyolefin or polyamide, or for example, they can even be the same, such as PET/PET, if steps are taken to prevent their bonding during the molding of the second pre-form layer. In such a process, a non-stick coating can be sprayed on the surface that will be between the pre-forms, where the second perform will touch the first one, and after such application, the second container can be molded, also in a 2C process. The order of manufacture can be either outer then inner, or inner then outer, in various exemplary embodiments. If outer then inner, the non-stick coating can be sprayed on the inside of the first molded outer perform, followed by molding of the inner prefrom. If the reverse, the non-stick coating is sprayed on the outside of the first molded inner perform, then followed by the molding of the outer perform. The material from which the inner container is made, the degree of shrinkage it will experience relative to the outer container, and the concomitant maximum hot fill temperature it can thus support, can all be designed for a given application, use or range of uses. |
