Method and apparatus for making rolled containers

摘要

A conical mandrel rotatable at a first station for rolling a precut paper-like container blank into a conical shape and having two separate, angularly spaced and axially extending rows of vacuum retention ports timely connected to a low pressure source via an axially shiftable control valve within the mandrel for vacuum retention of the leading and trailing edges of the rolled container blank as it is rolled and while the mandrel is indexed to a sealing station where overlapping leading and trailing edge portions of the rolled container blank are sealed together.