| 摘要 |
Apparatus for making a frusto-conical container from a blank having a base panel and side panels which are folded relative to the base, clamped between tools of an injection moulding machine and seamed by injected material fed along one face of the blank, the other faces of the side panels spanning a circumferential channel into which they are forced by injected material to form a circumferential bead, at the axial seams the channel being reduced in depth to support the side panels against displacement of the edges by injected material such as will allow injected material to reach that face of the blank nearest the channel. |
