| 摘要 |
<p>This invention improves heat resistance of the neck of a thin synthetic resin container which is utilized as a packing container of a liquid such as a fruit juice, edible oil, etc., requiring heat-packing, through a multi-layered structure. In the neck structure having a multi-layered structure wherein a thermoplastic resin having higher heat resistance than that of a resin forming the neck is disposed as a heat-resistant layer inside the thermoplastic resin forming the neck of the container, part of the resin forming the heat-resistant layer is exposed outside the neck forming resin at the open end of the neck portion, and the open end or the outside of the neck portion including the open end is formed by the same heat-resistant resin as that of the heat-resistant layer. Furthermore, the heat-resistant layer described above is further extended to the inside of a support ring so as to improve heat resistance.</p> |
