Method for dispensing liquid ingredients from a tubular bag in a metered manner, and means for carrying out the method

A method for dispensing viscous or pasty ingredients from a tubular bag by means of a rotary disposable pump (4) attached to the bag, wherein the ingredients are packaged in an aseptic manner, wherein the bag is closed prior to a first use, wherein the rotary disposable pump (4) includes an inlet (5) having a cutting element (6) connected to the rotary disposable pump in a rotationally fixed manner, wherein the inlet (5) has an external thread (7) which is connected in a nozzle (2) having a flange (3) that is attached to the tubular bag (1), and wherein an outlet of the rotary disposable pump (4) is an outlet tube (8) having a valve (9) which closes in a sealing manner, wherein the valve (90) includes a membrane (93) with a sliding ring (91), the method comprising:

• rotating the rotary disposable pump (4) including the cutting element (6) in a first step prior to an initial metering operation until the cutting element (6) has cut open the tubular bag (1),
• operating the rotary disposable pump (4) in a rotational direction until the ingredients (12) of a freely selectable volume have exited the valve (9) and the membrane (91) and sliding ring (91) have moved in a sealing and sliding manner to a first position, and
• subsequently operating the rotary disposable pump (4) in a direction opposite the rotational direction until at least the ingredients (12) present in a region of the valve (9) are suctioned back into the outlet tube (8) and the membrane (91) and sliding ring (93) have moved in a sealing and sliding manner to a second, different position, wherein the valve (9) reaches or remains in a closed valve state during the operating of the rotary disposable pump (4) in the direction opposite the rotational direction.