Koninklijke Emballage Industrie Van Leer B.v.

Gerleen H Braakman

Method of manufacturing a seam connection between body flanges (9) and end wall flanges (5) of a drum (11) by means of a seaming roller (14) which folds the flanges about eaach other, the essential difference with respect to prior art seaming operations being that the precurl (6) of the end wall flange (5), known in itself, is guided into the lower portion of the groove (15) of the seaming roller so that during the radial movement inwardly of the seaming roller (14) the flanges (5,9) may bulge outwardly in axial direction and form a so called cat's back by means of which the flanges and accordingly end wall (2) and body (1) are centered upon each other, whilst further a distance is provided between the upstanding edge (3) of the end wall (2) and the curvature (10) between body (1) and body flange (9) which distance during the seaming operation may be reduced. It moreover is possible by using a support (13) for the end wall which is smaller in diameter than the diameter of the body (1), to perform the seaming operation inwardly to a degree such that the final seam has an outer diameter which is substantially equal to the diameter of the body (1).

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Soest, Netherlands

Gerleen H Braakman