FIELD: packaging industry.
SUBSTANCE: plunger (6) is taken from partially hardened glass, leaving the print corresponding to the inlet hole of the bottle. The plunger has, at least, one screw groove (15) on external surface. During extraction the plunger rotates around the longitudinal axis (X-X), performing progressive rotation for unscrewing of the plunger of partially hardened glass, leaving female thread in the inlet hole (M) of the bottle. The progressive rotation for extraction of the plunger is provided with the linear executive mechanism (30), the guiding element (14) and the screw guide (16, 17), concentric with the longitudinal axis (X-X) and provided between the named guiding element (14) and the named plunger (6).
EFFECT: higher tightness of bottle sealing.
23 cl, 11 dwg
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