| 摘要 |
A method of providing a seal between the barrel portion and the end plate of a can including the steps of providing a metallic can plate having a circumferential peripheral portion of inverted U-shaped cross section, defining an annular groove, the peripheral portion including a free outer side wall, the can end plate being coated at its inner side with a first layer of heat-fusible plastic; providing a can barrel coated at its inner surface with a second layer of heat-fusible plastic; fitting the can end plate to the upper end of the can barrel such that the upper edge portion of the can barrel is tightly fitted in the annular groove and the can end plate; curling the free outer side wall at least one turn into the groove to form a curled and expanded portion protruding into the groove so that the groove has an upper portion and a lower portion narrower than the upper portion; pressing the curled and expanded portion against the upper edge portion of the can barrel so as to cause the upper edge portion of the can barrel to be compressed and expanded in the respective lower and upper portions of the groove; and applying heat to the junction between the upper end of the can barrel and the can end plate, thereby to fuse the first and second layers of plastic to form a tight seal between the can barrel and the can end plate. |
