Automated sterilization process integrated with a blow fill seal machine
A process and system for sterilization of a product pathway of a blow-fill-seal machine. The process comprises steps of: (1) isolating a holding tank from the product pathway; (2) supplying a sterilizing agent to the product pathway of the BFS machine when the holding tank is isolated; (3) stopping the supply of sterilizing agent to the product pathway when a threshold is reached; and (4) supplying filtered compressed air to the product pathway when the supply of sterilizing agent is stopped. The process is preferably executed automatically without human intervention once initiated. Also described is a system for carrying out the process including a processor, valves and temperature and/or pressure sensors which provide information to the processor to determine when to open and close the valves to supply sterilizing agent and/or compressed air to the product pathway or holding tank.
1. A system for sterilizing a product pathway of a blow-fill-seal machine, comprising:
at least one processor;
a pressure sensor in a holding tank that is configured to be isolated from the product pathway during sterilization by closing all inlets to and outlets from the holding tank;
a pressure or temperature sensor in the product pathway;
a valve for controlling supply of sterilizing agent to the product pathway;
a valve for controlling supply of compressed air to the product pathway and/or the holding tank; and
a processor that issues one or more commands to ensure that all inlets to and outlets from the holding tank are closed during the sterilization,
wherein the pressure and temperature sensors communicate with the processor to provide pressure and/or temperature information to the processor and the processor determines when to open and close said valves based on said pressure and/or temperature information.
2. The system of claim 1 , wherein the valve for controlling supply of compressed air is adapted to continuously supply compressed air to the holding tank.
3. The system of claim 1 , wherein the sterilizing agent is selected from the group consisting of steam, ozone, hydrogen peroxide, hot water, and combinations thereof.
4. The system of claim 1 , wherein the sterilizing agent is steam.
5. The system of claim 4 , wherein the steam has a temperature in the range of from about 100° C. to about 150° C.
6. The system of claim 4 , wherein the steam has a pressure in the range of from about 20 psig to about 40 psig.
7. The system of claim 4 , wherein the valve for controlling the supply of sterilizing agent to the product pathway is adapted to stop supplying sterilizing agent to the product pathway when a threshold is reached.
8. The system of claim 7 , wherein the threshold is a temperature in the product pathway.
9. The system of claim 8 , wherein the threshold is a temperature in a range of from about 100° C. to about 150° C.
10. The system of claim 7 , wherein the threshold is a period of time supplying the sterilizing agent to the product pathway.
11. The system of claim 10 , wherein the period of time is in the range of from about 10 minutes to about 50 minutes.
12. The system of claim 7 , wherein the threshold is the calculated Fo value.
13. The system of claim 12 , wherein the Fo value is in the range of from about 50 minutes to about 70 minutes.
14. The system of claim 1 , wherein the holding tank is adapted to have pressure raised by having filtered compressed air supplied at or above a threshold pressure.
15. The system of claim 14 wherein the threshold pressure is in a range of from about 1 psig to about 10 psig.