| 摘要 |
This invention relates to improved apparatus and method for forming the rim portion of frustoconically-shaped containers, preferably formed of paper or thermoplastic material. The invention is especially adapted to forming the helicoidal rim on the mouth of drinking cups as well as other types of frustoconical-shaped containers. The container sidewalls adjacent the open mouth are fully supported during rimming to provide stronger and more dimensionally accurate, uniform rims on such containers.
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