Method, metering device and metering valve for the aseptic measured delivery of a liquid additive into a forced flow of a base product
A method for the aseptic measured delivery of a liquid additive (Z) into a forced flow of a base product (P), wherein the additive (Z) is removed from a storage container ( 18 ) under aseptic conditions by means of a removal conduit ( 18 a ) and is fed via an end section (E) of the removal conduit ( 18 a ) to the base product (P), which flows through a product chamber (RP) and a metering device and valve.
1. A method for the aseptic measured delivery of a liquid additive (Z) into a forced flow of a base product (P), wherein the additive (Z) is removed from a storage container ( 18 ) under aseptic conditions by means of a removal conduit ( 18 a ) and is fed via an end section (E) of the removal conduit ( 18 a ) to the base product (P), which flows through a product chamber (RP), the method including
the following treatment steps for the end section (E), before the latter feeds the additive (Z) to the base product (P):
(a) the end section (E) is temporarily introduced a certain distance into an initial chamber (R) from one side or is permanently positioned therein and is sealed at the penetration point to this initial chamber (R), wherein the latter can optionally be opened towards the product chamber (RP);
(b) a terminal part (E 1 ) of the end section (E) that projects into the initial chamber (R) in a sealed manner is at least sterilized, wherein all regions of the initial chamber (R) are also included in this treatment;
(c) the terminal part (El) of the end section (E) is slid a certain distance into a partial chamber (R 1 ) that can optionally be sealably divided from the initial chamber (R), the terminal part (E 1 ) being sealed at the end of the sliding action at the penetration point to the partial chamber (R 1 ) by means of a sealing means treated as per treatment step (b); and
(d) the partial chamber (R 1 ) is opened towards the product chamber (RP).
2. The method according to claim 1 , wherein:
a cooling under sterile conditions follows the sterilization according to treatment step (b).
3. The method according to claim 2 , wherein:
the sterilization takes place with sterile steam (D) and the cooling with sterile air (L).
4. The method according to claim 2 , wherein
the sterilization and the cooling take place in a temperature-monitored manner respectively downstream of the terminal part (E 1 ) to be treated.
5. The method according to claim 2 , wherein:
the sterilization is performed at a temperature above 125° C. and the cooling takes place to a temperature below 50° C.
6. The method according to claim 1 wherein:
the removal conduit ( 18 a ) remains free of the additive (Z) up to completion of the treatment step (b) or (c) and that the additive (Z) is then applied up to the discharge point of the terminal part (E 1 ).
7. The method according to claim 6 , wherein:
a flushing of the initial chamber (R) with sterile condensate (K) is optionally performed below a temperature of 50° C.
8. The method according to claim 7 , wherein:
it is blown out by means of sterile air (L) after the flushing of the initial chamber (R).
9. The method according to claim 1 , wherein:
the transport of the additive (Z) takes place in a forced manner in the removal conduit ( 18 a ).
10. The method according to claim 1 , wherein:
the additive (Z) is delivered in a measured manner to the base product (P) flow-proportional to the quantity.