Importance

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Abstract

In a method of producing a container having a bellows bottom (2) and a protection lid (3), sleeve (1) is maintained in one axial position while a bellows bottom blank (27) is pressed into sleeve (1) to a position whereat it is welded in place by heating the thermoplastic, whereupon sleeve (1) is axially moved to and maintained in another position and lid blank (3) is pressed into sleeve (1) to position whereat lid blank (3) is similarly welded in place. The apparatus comprises a carrier (9) having an opening for supporting sleeve (1) in each of two (raised and lowered) positions, a welding ring (10) around the opening for melting the adhesive, and a plunger (11) for successively pressing the two blanks (27, 3) into sleeve (1), while at the same time shaping them and forming a folded rim or flange on each. Plunger (11) comprises a lower plunger part (17) which shapes bellows bottom (2) and which is movable relative to an upper plunger part (18), to cause expansion of a rubber ring (19) located between the plunger parts (17, 18), to force the bellows bottom rim against sleeve (1) and the latter against the welding ring (10) during welding. Welding of protection lid (3) is effected while interaction of lower plunger part (17) and carrier (9) causes lid rim and sleeve (1) to bulge outwardly, with the latter against heated welding ring (10).

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First Claim