| 摘要 |
An apparatus is provided for forming an outwardly-rolled lip on an open end of a deformable cylindrical container body. The apparatus may include a mandrel having a generally cylindrical-shaped portion for movably supporting at least a porti on of an interior surface of the container body. The apparatus further includes a lip - forming die assembly forming a part of the mandrel and having an annular cavity defining an open mouth portion and a closed bottom portion which defines a surface area extending generally radially outwardly of the mandrel outer surface and which is oriented with the open mouth portion generally transverse to an outer periphery of the contain er body and which faces the open end of the container body around the periphery. An axia l forcing member contacts the other end of the container body for axially moving the container body along the outer surface of the mandrel and the container open end into and through the die assembly. The cavity bottom portion surface area of the lip-forming die assembly has a generally C-shaped cross-sectional contour in the direction of its outward extension which includes a combination of curved and straight sections positioned at predetermined radii and angles to a longitudinal axis of the container body, so that, when the outer periphery of the open end of the container body is forced into and through t he die assembly to form the outwardly-rolled lip, the end of the container body wil l contact only a part of the bottom portion surface area of the die cavity to reduce frictional engagement and to minimize the force necessary to move the end of the container body through the die. |
