CN112188982A - Method for maintaining positive pressure in tank and device for maintaining positive pressure in tank - Google Patents
Method for maintaining positive pressure in tank and device for maintaining positive pressure in tank Download PDFInfo
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- CN112188982A CN112188982A CN201980035024.1A CN201980035024A CN112188982A CN 112188982 A CN112188982 A CN 112188982A CN 201980035024 A CN201980035024 A CN 201980035024A CN 112188982 A CN112188982 A CN 112188982A
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- tank
- pressure
- product liquid
- air
- positive pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/04—Heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
- B65B55/02—Sterilising, e.g. of complete packages
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- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
- Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
In a sterilizing filter provided in an air supply device for supplying air to a tank for storing a product liquid and a flow path for connecting the tank and the air supply device to maintain a positive pressure, the smell of the product liquid is prevented from remaining, and the smell of the product liquid filled before is prevented from entering the product liquid filled next. The apparatus is provided with an air discharge device for discharging air in the headspace when the pressure of air in the headspace of at least one of a pressure regulating tank for storing a product liquid, a carbonated pressure regulating tank for storing the product liquid to which carbon dioxide gas has been added, and a pressure tank provided in the vicinity of a filling device for filling the product liquid into the container increases.
Description
Technical Field
The present invention relates to a method and apparatus for maintaining a positive pressure in a tank, in which air is supplied to a head space in the tank to maintain a positive pressure in the tank in which a product liquid is retained, and the air in the head space is exhausted when the pressure in the head space exceeds a pressure to be maintained due to a rise in the liquid level in the head space.
Background
A container such as a bottle is filled with a beverage such as a carbonated beverage, a fruit juice beverage, tea, a coffee beverage, or a sports drink by a liquid filling machine. The product liquid such as beverage includes non-carbonated sterilized product liquid such as carbonated beverage without fruit juice, carbonated sterilized product liquid such as carbonated beverage with fruit juice, and non-carbonated sterilized product liquid such as tea, coffee beverage, fruit juice beverage. In order to fill containers with the carbonated and non-carbonated sterilized product liquids, an aseptic filling machine is used in which a sterilized product liquid is filled into a sterilized container in an aseptic atmosphere and the filled container is sealed with a sterilized lid member. In the aseptic filling machine, the container can also be filled with a non-sterile product liquid. Therefore, the non-carbonated and non-carbonated sterilized product liquids, the carbonated sterilized product liquids, and the non-carbonated sterilized product liquids are filled by the aseptic filling machine.
A variety of products are filled in aseptic filling machines. A product liquid such as a beverage contains various flavors corresponding to contents, and it is necessary to prevent the flavor of the flavor from entering other products. Therefore, before filling of the product liquid and starting filling of a different product liquid, CIP (Cleaning in Place) for Cleaning the inside of the product liquid supply system pipe is performed. The CIP of circulating the cleaning liquid in the product liquid supply system piping and spraying the cleaning liquid into the tank enables replacement of the product liquid filled by the aseptic filling machine without disassembling the product liquid supply system piping.
However, the odor of the product liquid remains in the piping, and it is necessary to perform CIP for a long time or use a cleaning agent effective for removing the odor in the cleaning liquid. Long CIP runs can reduce the productivity of the aseptic filling machine. Further, although the use of a cleaning agent is effective for removing odor, there is a possibility that the member such as a gasket may be deteriorated.
In order to prevent a smell from remaining in a member such as a gasket used in a product liquid supply system pipe and to prevent a smell of a product liquid produced before from entering a product liquid to be filled next, a detergent composition effective for removing the remaining smell has been proposed (patent documents 1 and 2). Further, a method of adding ozone to a cleaning liquid in CIP has been proposed (patent document 3).
The product liquid is prepared by mixing a plurality of raw materials in a preparation device and is stored in a storage tank for a long time. Therefore, even if a smell remains in the gas phase, the inner wall, the liner, and other members inside the storage tank, it is proposed to remove the remaining smell by supplying steam to the storage tank (patent document 4). The product liquid remaining in the storage tank is conveyed to the balance tank, heat sterilization is performed after the product liquid is stored in the balance tank, the sterilized product liquid is stored in the pressure regulating tank, the product liquid is conveyed from the pressure regulating tank to the pressure tank of the filling device, and the filling device is used for filling the sterilized container in the sterile atmosphere. The filling valve provided in the filling device has a narrow flow path through which the product liquid flows, and the flow path has a valve mechanism and a packing. When the aseptic filling machine is stopped, the product liquid stays in the filling valve for a long time. As a result, the smell remains in the flow path, the valve mechanism, the gasket, and the like. A method of removing odor remaining in a flow path of a filling valve, a valve mechanism, a gasket, and the like by steam has also been proposed (patent document 5).
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent application publication No. 2005-206794
Patent document 2: japanese unexamined patent publication No. 2013-18862
Patent document 3: japanese unexamined patent publication No. 2007-236706
Patent document 4: japanese unexamined patent publication No. 2017-71441
Patent document 5: international publication No. 2017/135449
Disclosure of Invention
Technical problem to be solved by the invention
After sterilizing a product liquid such as a beverage, the product liquid is filled in a sterilized container in an aseptic atmosphere, and the filled container is sealed with a sterilized lid member, and then the flavor contained in the product liquid such as a beverage remains in various tanks, flow paths, valve mechanisms, and pads of the aseptic filling machine. CIP is performed to remove the residual taste. However, even when CIP is performed, the taste of the product liquid filled before remains in the product liquid filled next. After studying the cause, it was found that there were portions where the odor remained in addition to various tanks, flow paths, valve mechanisms, gaskets, and the like of the aseptic filling machine. The apparatus is provided with a pressure-regulating tank for storing a product liquid after sterilization, a carbonated pressure-regulating tank for storing a carbonated product liquid obtained by adding carbon dioxide gas to the sterilized product liquid, a pressure tank provided in a filling device, and a sterilizing filter provided in an air supply device for supplying air while maintaining a flow path connecting the pressure tank and the pressure tank at a positive pressure. The sterilizing filter has a smell remaining therein, and the smell of the previous product liquid remaining in the sterilizing filter is mixed into the air supplied when the next product liquid is filled, and the smell of the previous product liquid enters the next product liquid to be filled.
The residual taste in the sterilizing filter is due to the air in the headspace containing the taste of the canister flowing back to the sterilizing filter. By supplying the sterile air having passed through the sterilizing filter to the head space of the tank, the invasion of bacteria from the outside into the tank is prevented, and the escape of the added carbon dioxide gas is prevented. The product liquid is also pumped by the pressure of the sterile air that has passed through the sterilizing filter. The amount of product liquid supplied to the tank and the amount of product liquid transferred downstream are balanced, but the liquid level in the head space moves up and down. In the case where the liquid level falls and the pressure of the headspace decreases, the pressure of the headspace is kept constant by the supply of sterile air. As the liquid level rises, the pressure in the headspace rises due to the reduction in the volume of the headspace. As the pressure in the headspace increases, the air in the headspace flows in reverse to reach the sterilizing filter. The air that reaches the head space of the sterilizing filter contains droplets and the taste of the product liquid, and the taste of the product liquid is adsorbed to the sterilizing filter. Since the aseptic filling machine is filled with the carbonated non-sterile product liquid, the carbonated sterile product liquid, and the non-carbonated sterile product liquid, in the case of the carbonated non-sterile product liquid, the sterile air having passed through the sterilizing filter is supplied to prevent the escape of carbon dioxide gas in the carbonated pressure-regulating tank common to the carbonated sterile liquid. The product liquid in the tank is pumped downstream from the tank by the air passing through the sterilizing filter. Therefore, in the case of a carbonated non-sterile product liquid, the taste is also adsorbed to the sterilizing filter.
For the above reasons, there has been demanded a method and an apparatus for preventing the taste of a product liquid from remaining in a sterilizing filter provided in a pressure regulating tank for storing the product liquid, a carbonated pressure regulating tank for storing the product liquid to which carbon dioxide gas is added, a pressure tank provided in a filling apparatus, and an air supply apparatus for supplying air while maintaining a positive pressure in a flow path connecting the pressure tank and the pressure tank, and preventing the taste of the product liquid filled before from entering the product liquid filled next. Although there is a method of replacing the sterilizing filter according to the type of the product liquid, the replacement work is complicated, and the storage and management of the removed sterilizing filter are also troublesome.
The present invention aims to provide an in-tank positive pressure holding method and an in-tank positive pressure holding apparatus that can solve such problems. That is, the present invention provides a pressure regulating tank for storing a product liquid after sterilization, a carbonated pressure regulating tank for storing a product liquid to which carbon dioxide gas is added, and a method for maintaining a positive pressure in a tank and a device for maintaining a positive pressure in a tank, which are provided in a pressure tank provided in a filling device, for preventing air containing a smell in a headspace from flowing backward and adsorbing the smell to a sterilizing filter.
Technical solution for solving technical problem
The method for maintaining a positive pressure in a tank according to the present invention is characterized by comprising: an air supply step of supplying air having passed through a sterilizing filter to a head space of a tank in which a product liquid is stored, thereby setting a pressure of the head space in the tank to a predetermined positive pressure; and an air discharge step of stopping the air supply step and discharging the air in the head space through a path different from a path through which the air is supplied to the tank, when the pressure in the head space exceeds a predetermined positive pressure or may exceed the predetermined positive pressure.
In the method for maintaining a positive pressure in a tank of the present invention, the tank is preferably at least one of a pressure regulating tank that stores the product liquid upstream of a filling device, a carbonated pressure regulating tank that stores the product liquid to which carbon dioxide gas is added, and a pressure tank that is provided near the filling device that fills the product liquid into a container and stores the product liquid.
In the method for maintaining a positive pressure in a tank of the present invention, the predetermined positive pressure is preferably 0.001 to 0.8 MPa.
In the method for maintaining a positive pressure in a tank of the present invention, it is preferable that the product liquid is left in the tank after being sterilized.
The in-tank positive pressure holding device of the present invention is characterized by comprising: a tank to hold a product liquid;
an air supply device for supplying air having passed through the sterilizing filter to a head space of the tank so that the pressure of the head space in the tank becomes a predetermined positive pressure; and an air discharge device that stops supply of the air and discharges the air in the headspace through a path different from a path through which the air is supplied to the tank, when the pressure in the headspace exceeds a predetermined positive pressure or when the pressure in the headspace may exceed the predetermined positive pressure.
In the in-tank positive pressure holding device of the present invention, the tank may be at least one of a pressure regulating tank that stores the product liquid upstream of a filling device, a carbonated pressure regulating tank that stores the product liquid to which carbon dioxide gas is added, and a pressure tank that is provided near the filling device that fills the product liquid into a container and stores the product liquid.
In the positive pressure holding device in a tank according to the present invention, it is preferable that a sterilizing device for sterilizing the product liquid is provided upstream of the tank.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, when the pressure in the head space of the tank in which the filled product liquid is retained rises, the air in the head space can be discharged without allowing the air in the head space to reach the sterilizing filter. As a result, the taste of the product liquid is not adsorbed to the sterilizing filter, and the taste of the product liquid filled before can be prevented from entering the product liquid filled next.
Drawings
Fig. 1 shows a flow from preparation of a product liquid to filling in a liquid filling machine including an in-tank positive pressure holding device according to an embodiment of the present invention.
Fig. 2 shows an in-tank positive pressure holding apparatus according to an embodiment of the present invention.
Fig. 3 shows a conventional in-tank positive pressure holding device.
Fig. 4 shows a flow path of a cleaning liquid in the case of performing CIP on the in-tank positive pressure holding apparatus according to the embodiment of the present invention.
Fig. 5 shows a flow path of vapor in the case where SIP is performed for the in-tank positive pressure holding device according to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In an aseptic filling machine for beverages and the like, a product liquid such as a beverage is prepared and filled into a container according to the flow shown in fig. 1. Carbonic acid-free sterilization product liquid is joined in marriage through blending device 1, and the product liquid after the blending is stayed in balance tank 2, disinfects through sterilizing equipment 3 to the product liquid that stays, and the product liquid that has carried out the sterilization stays in pressure regulating tank 4, and the product liquid that stays is carried and is being filled the product liquid to pressure tank 7 that the near filling device that the container was filled near, and the filling valve 10 that sets up at filling device 8 is filled container 9 to the follow.
Utilize blending device 1 allotment carbonic acid sterilization product liquid, the product liquid after the allotment is stayed in balance tank 2, utilize sterilizing equipment 3 to disinfect to the product liquid that stays, utilize carbon dioxide gas adding device 5 to add carbon dioxide gas to the product liquid that has carried out the sterilization, the carbonic acid product liquid that has added carbon dioxide gas stays in carbonic acid pressure regulating tank 6, and the product liquid that stays carries to overhead tank 7, fills to container 9 from setting up in filling valve 10 of filling device 8.
The carbonated non-sterile product liquid is prepared by the preparing device 1, the prepared product liquid is stored in the balance tank 2, the carbon dioxide gas is added to the stored product liquid by the carbon dioxide gas adding device 5, the carbonated product liquid added with the carbon dioxide gas is stored in the carbonated pressure regulating tank 6, the stored product liquid is conveyed to the pressure tank 7, and the container 9 is filled from the filling valve 10 arranged on the filling device 8.
The product liquid is prepared by using the preparation device 1. Water, fruit juice, coffee, tea, dairy products, sugars, sweeteners, stabilizers, emulsifiers, caffeine, vitamin C, flavors, and the like, which are raw materials, are quantitatively fed in a desired amount into the mixing device 1, and the product liquid is mixed. The flavor sources are flavors contained in juice, coffee, tea, etc. and flavors directly inputted. The flavors contained in the natural product and the flavors extracted from the natural product or artificially produced flavors added at the time of blending remain in the route from the blending device 1 to the filling valve 10, whereby the flavors of the previously filled product liquid in the aseptic filling machine are introduced into the product liquid to be filled next.
The blended product liquid is retained in the balancing tank 2. The product liquid stored in a predetermined amount is sterilized by the sterilizer 3 while being transferred by a liquid transfer device such as a pump. The carbonic acid non-sterilized product liquid which does not require sterilization is not sterilized by the sterilization device 3 but carbon dioxide gas is added by the carbon dioxide gas adding device 5, and the carbonic acid product liquid to which carbon dioxide gas is added is stored in the carbonic acid pressure regulating tank 6.
The sterilizing apparatus 3 includes a first-stage heating unit, a second-stage heating unit, a heat-insulating pipe, a first-stage cooling unit, a second-stage cooling unit, and the like in its interior, and gradually heats the product liquid supplied from the equilibrium tank 2 while conveying the product liquid from the first-stage heating unit to the second-stage heating unit, reaches a target temperature at an outlet of the second-stage heating unit, maintains a sterilizing temperature in the heat-insulating pipe for a certain period of time, and then conveys the product liquid to the first-stage cooling unit and the second-stage cooling unit to gradually cool the product liquid. The number of stages of the heating unit and the cooling unit can be increased or decreased as necessary. The sterilization apparatus 3 may be configured to be provided with a homogenizer capable of automatic cleaning. The installation part can be between a first stage heating part with the temperature of the product liquid of about 50-70 ℃ and a second stage heating part with the temperature of the product liquid of about 60-150 ℃ or between the first stage cooling part and the second stage cooling part. In the former case, a general homogenizer may be sufficient, but in the latter case, a homogenizer of aseptic specification needs to be provided. The sterilization device 3 may be in any form of shell and tube heat exchanger, plate heat exchanger, etc. Further, the indirect heating method is not limited to these, and a direct heating method may be applied.
The carbonic acid-free sterilized product liquid is supplied to the pressure-regulating tank 4 by the pressure of a liquid-supplying device such as a pump for supplying the product liquid to the sterilizing device 3. When a predetermined amount of the product liquid sterilized is stored in the pressure-regulating tank 4, the product liquid is transferred from the pressure-regulating tank 4 to the pressure tank 7. The pressure-regulating tank 4 and the piping for supplying the product liquid from the pressure-regulating tank 4 to the downstream filling device 8 are internally sterilized after Cleaning (CIP) (SIP in Place sterilization), and then maintained at a positive pressure by the sterile air supplied from the air supply device 11.
The product liquid, which is the carbonated sterilization product liquid, is supplied to the pressure-regulating tank 4 by the pressure of a liquid supply device such as a pump that supplies the product liquid to the sterilization device 3. When a predetermined amount of the sterilized product liquid is stored in the pressure-regulating tank 4, the product liquid is fed from the pressure-regulating tank 4 by a liquid feeding device such as a pump, and carbon dioxide gas is added by the carbon dioxide gas adding device 5. The carbonated sterilizing product liquid added with carbon dioxide gas is conveyed to and stored in the carbonated pressure regulating tank 6. The carbonated sterilizing product liquid remaining in the carbonation pressure-regulating tank 6 is sent to the pressure tank 7. The pressure regulating tank 4, the carbonated pressure regulating tank 6, the pressure tank 7, and the piping for supplying the product liquid from the pressure regulating tank 4 to the downstream filling device 8 are Sterilized (SIP) after Cleaning (CIP), and then maintained at a positive pressure by the sterile air supplied from the air supply device 11.
The sterilized product liquid stored in the pressure-regulating tank 4 is transferred to the pressure tank 7 by the pressure of the sterile air supplied from the air supply device 11. The product liquid stored in the pressure tank 7 is transferred to the filling device 8 by the pressure of the sterile air, and is filled into the container 9 through the filling valve 10. The sterilized product liquid is transported by the pressure of sterile air without using a liquid transport device such as a pump having a vapor seal in a drive section, and thereby the sterilization of the liquid transport mechanism after the sterilization can be facilitated. Further, the tank and the pipe are maintained at a positive pressure by sterile air, whereby invasion of bacteria from the outside can be prevented.
Fig. 2 shows an in-tank positive pressure maintaining device for maintaining a positive pressure in a head space in the pressure-regulating tank 4. The in-tank positive pressure holding device includes an air supply device 11. The air supply device 11 includes an air pressurizing device 13 and a sterilizing filter 12. The air pressurized by the air pressurizing device 13 is sent to the sterilizing filter 12. The air sterilized by the sterilizing filter 12 is supplied to the pressure regulating tank 4, and the inside of the pressure regulating tank 4 is maintained at a positive pressure. The pressure of the sterile air to be a positive pressure is preferably 0.001MPa to 0.8 MPa. If the pressure is less than 0.001MPa, bacteria and the like may enter from the outside, and the pressure is insufficient for pressure-feeding the product liquid. Further, when the pressure exceeding 0.8MPa is used to fill the container 9 with the product liquid, the filling speed is high, and the product liquid may be ejected from the container.
Although fig. 2 shows the in-tank positive pressure holding device of the pressure regulating tank 4, the carbonation pressure regulating tank 6 and the pressure tank 7 have the same in-tank positive pressure holding device even if the pressure regulating tank 4 is the carbonation pressure regulating tank 6 and the pressure tank 7. The pressure tank 7 may not include an in-tank positive pressure holding means. This is because, in the case of a carbonated non-sterile beverage, it is not necessary to supply sterile air to the pressure tank 7. In the case of carbonated sterilized beverages, the pressure in the pressure tank 7 can be controlled by a gas supply control valve and a gas discharge control valve provided in the filling device 8. In the case of a carbonated sterilized beverage, the pressure is unstable by PID control because of slight pressurization, and can be maintained at a constant pressure by a precision controller.
The air pressurizing device 13 is, for example, an air compressor, and supplies air by continuously or intermittently operating a motor. The motor rotates to supply the atmosphere into the tank of the air compressor, and the pressure in the tank rises. A pressure detection sensor is provided in the tank, and when the pressure reaches an upper limit set value, the rotation of the motor is stopped. When the pressure sensor detects a pressure equal to or lower than the lower limit set pressure, the operation of the motor is restarted, and the pressure in the tank is increased. In the embodiment, the pressure of the air supplied is 0.001MPa to 0.8 MPa. The air pressure generated by the air compressor may also be a pressure exceeding 0.8 MPa. If the pressure can be appropriately set by the pressure reducing valve and air can be supplied to the sterilizing filter 12, the original pressure is not problematic even if it is too high. The air pressurizing device 13 may use a blower instead of the air compressor.
The air supplied from the air pressurizing device 13 contains dust, moisture, oil, organic chemical substances, and the like. It is preferable to provide a filter for removing the air pressurizing means 13 and the opening/closing valve 17. By providing a filter having pores exceeding 0.5 μm, dust and oil can be removed. Further, a filter made of fibrous or granular activated carbon may be provided to adsorb the organic chemical substance to the activated carbon, thereby removing the organic chemical substance. It is preferable to remove impurities such as dust, moisture, oil, and organic chemical substances from the air before the air is sent to the sterilizing filter 12. An air dryer is provided to cool the air supplied from the air pressurizing device 13 and condense moisture in the air. The condensed moisture is discharged through an automatic drain discharge valve provided at a lower portion of the air dryer. If these impurities reach the sterilizing filter 12, there is a possibility that the durability of the sterilizing filter 12 is shortened.
The sterilizing filter 12 is a hollow cylindrical filter, and the hollow cylindrical filter is housed in a case detachably attached to the case and is detachably attached to the case. An inlet port for air is formed in the case so that air can be supplied from the outside to the hollow cylindrical filter, and an outlet port for discharging the air having passed through the hollow cylindrical filter through the hollow portion is formed in the case. A drain reservoir is formed in the lower portion of the housing, and an automatic drain trap is attached to the housing so as to communicate with the drain reservoir.
The sterilizing filter 12 has a filter capable of removing bacteria, mold, spores, etc., has pores of about 0.1 to 0.5 μm, and is formed of regenerated cellulose, nitrocellulose, polytetrafluoroethylene, etc. The sterilizing filter 12 is formed by sandwiching a filter having such fine pores between support members, which are nonwoven fabrics made of polypropylene or cellulose, folding the obtained laminate into a hollow shape, fixing the inside and outside of the folded hollow with a support core made of stainless steel mesh, and closing the ends with end caps made of heat-resistant plastic such as polystyrene. An outlet port for discharging air from the hollow portion is formed in one end cap, and the outlet port is fixed to the housing using an O-ring such as silicone rubber.
The sterile air supplied from the air supply device 11 keeps the pressure in the pressure regulating tank 4, the carbonated pressure regulating tank 6, the pressure tank 7, and the piping from the sterilizer 3 to the filling valve 10 at a positive pressure. The pressure-regulating tank 4 is maintained at a predetermined positive pressure by sterile air after SIP is performed. The product liquid is sterilized by the sterilizer 3, and the sterilized product liquid is supplied to the pressure-regulating tank 4, whereby the volume of the head space in the pressure-regulating tank 4, which is maintained at a predetermined pressure, is reduced. The pressure in the headspace increases with the decrease in volume.
When the pressure in the head space rises, in the conventional in-tank positive pressure holding device shown in fig. 3, the air in the head space flows backward in the air supply device 11, the on-off valve 17 is closed, the on-off valve 19 is opened, and the air is discharged to the outside of the piping system in the vicinity of the on-off valve 17. The air in the headspace contains the flavor and spray of the product liquid, which is adsorbed to the sterilizing filter 12. The sterilizing filter 12 uses a filter having fine pores, a nonwoven fabric supporting the filter, an O-ring, a plastic member such as an end cap, and absorbs the taste of the product liquid. The droplets of the product liquid adhere to metal components other than plastic components such as plastic components and support cores.
The air in the headspace in the pressure-regulating tank 4 flows backward through the air supply device 11, passes through the sterilizing filter 12, and is discharged to the outside of the piping system at the position just before the on-off valve 17, whereby the pressure in the headspace in the pressure-regulating tank 4 is reduced to a predetermined pressure, and the discharge of the air is completed. Then, sterile air is supplied to the head space of the pressure-regulating tank 4 by the air supply device 11, and the pressure inside the pressure-regulating tank 4 is maintained at a predetermined pressure by the pressure of the supplied sterile air. When a predetermined amount of the product liquid is stored in the pressure regulating tank 4, the product liquid stored in the pressure regulating tank 4 is pressure-fed to the pressure tank 7 by the pressure of the supplied sterile air. As the volume of the head space in the pressure-regulating tank 4 changes, air in the head space is discharged, and droplets of the product liquid adhere to the sterilizing filter 12, and the odor is adsorbed to the sterilizing filter 12.
In the carbonation pressure-regulating tank 6, the adsorption of the taste to the sterilizing filter 12 occurs in the same manner as in the pressure-regulating tank 4. The sterilized product liquid delivered from the pressure regulating tank 4 is added with carbon dioxide gas by the carbon dioxide gas adding device 5, flows into the carbonation pressure regulating tank 6, and the volume of the headspace in the carbonation pressure regulating tank 6, which is maintained at a predetermined pressure, is reduced. The pressure in the headspace increases with the decrease in volume. When the pressure in the head space rises, in the conventional in-tank positive pressure holding apparatus similar to the in-tank positive pressure holding apparatus shown in fig. 3, the air in the head space passes through the sterilizing filter 12, flows backward in the air supply device 11, and is discharged to the outside of the piping system at a position near the opening/closing valve 17. The air in the head space contains the taste and droplets of the product liquid, and the taste of the product liquid is adsorbed to the sterilizing filter 12.
In the pressure tank 7, the adsorption of the odor to the sterilizing filter 12 occurs in the same manner as in the pressure-regulating tank 4. When the product liquid flows into the pressure tank 7 from the pressure regulating tank 4 or the carbonation pressure regulating tank 6, the volume of the head space in the pressure tank 7, which is maintained at a predetermined pressure, decreases. The pressure in the headspace increases with the decrease in volume. When the pressure in the head space rises, in the conventional in-tank positive pressure holding apparatus similar to the in-tank positive pressure holding apparatus shown in fig. 3, the air in the head space flows back through the air supply device 11, passes through the sterilizing filter 12, and is discharged to the outside of the piping system at a position just before the opening/closing valve 17. The air in the head space contains the taste and droplets of the product liquid, and the taste of the product liquid is adsorbed to the sterilizing filter 12.
When the product liquid to be filled is changed, the air having passed through the sterilizing filter 12 is supplied into the pressure-regulating tank 4. The taste of the product liquid before the change adsorbed to the sterilizing filter 12 is mixed into the product liquid after the change. The sterilizing filter 12 has pores, and it is difficult to circulate the cleaning liquid and perform CIP. Moreover, it is complicated to replace the sterilizing filter 12 with a product liquid. Further, there is a possibility that another sterilizing filter 12 is erroneously attached at the time of replacement, and it is not suitable as a method for preventing the smell of the sterilizing filter 12 from being mixed.
The in-tank positive pressure holding device shown in fig. 2 is provided to prevent the odor adsorption of the sterilizing filter 12 caused by the air in the head space discharged by the pressure increase in the head space in the pressure-regulating tank 4 as described above. That is, in the in-tank positive pressure holding apparatus of the present invention, the air supply device 11 is the same as the conventional one, but the air discharge device 14 for discharging the air in the head space of the pressure regulating tank 4 is provided.
The carbonic acid pressure regulating tank 6 is also provided with an in-tank positive pressure holding device similar to the pressure regulating tank 4. That is, the in-tank positive pressure holding device shown in fig. 2 is provided in order to prevent odor adsorption of the sterilizing filter 12 caused by the air in the head space discharged due to the pressure increase in the head space in the carbonation pressure regulating tank 6.
When the pressure tank 7 for storing the product liquid is provided in the vicinity of the filling device 8, the pressure tank 7 is also provided with an in-tank positive pressure holding device similar to the pressure regulating tank 4. That is, the in-tank positive pressure holding device shown in fig. 2 is provided in order to prevent odor adsorption of the sterilizing filter 12 caused by the air in the head space discharged due to the pressure increase in the head space in the pressure tank 7.
The headspace air discharged as a result of the pressure increase in the headspace in the pressure-regulating tank 4 is discharged not from the piping of the air supply device 11 to the sterilizing filter 12 but from the air discharge device 14. The air discharge device 14 includes a pipe for discharging the air in the head space of the pressure-regulating tank 4 to the outside of the aseptic filling machine, and preferably includes a sterilizing filter 15. The sterilizing filter 15 adsorbs the taste of the product liquid by exhausting the air in the head space. However, since air of a predetermined pressure is supplied to the pressure-regulating tank 4 by the air supply device 11, the air passing through the sterilizing filter 15 does not reach the pressure-regulating tank 4. The sterilizing filter 15 is used to prevent bacteria and the like from entering the inside of the pipe of the air outlet device 14 from the outside. The sterilizing filters 12 and 15 may be of the first order as in fig. 2. Further, two or more stages may be provided.
The in-tank positive pressure maintaining device is provided in at least one of the pressure regulating tank 4, the carbonic acid pressure regulating tank 6, and the pressure tank 7. The pressure regulating tank 4 and the carbonic acid pressure regulating tank 6 may be provided, or the pressure regulating tank 4, the carbonic acid pressure regulating tank 6, and the pressure tank 7 may be provided in their entirety. The tank internal positive pressure holding devices are provided individually so as to hold the pressure in each tank at a predetermined value.
When air is supplied from the air supply device 11 to the head space of the surge tank 4, the on-off valves 16 and 17 of the air supply device 11 become open. Then, the opening/closing valve 18 of the air discharge device 14 is closed. When the pressure in the head space exceeds a predetermined pressure or may exceed the predetermined pressure due to the rise of the liquid level of the product liquid in the pressure regulating tank 4, the on-off valve 16 of the air supply device 11 is closed, the on-off valve 18 of the air discharge device 14 is opened, and the air in the head space of the pressure regulating tank 4 is discharged to the outside of the pressure regulating tank 4. The air in the headspace does not flow back through the piping of the air supply device 11 to reach the sterilizing filter 12 as in the conventional case.
Here, the case where the pressure of the head space exceeds the prescribed pressure or the case where there is a possibility of exceeding is a case where the pressure of the air of the head space exceeds 95% of the prescribed pressure. At 95% or less, the air in the head space does not flow back through the piping of the air supply device 11. If it exceeds 95%, there is a possibility that the pressure of the air in the head space exceeds a prescribed pressure. Since there is a time lag before the signal is sent to the control device to open and close the valve, the control signal can be issued when there is a possibility of an excess. If the ratio exceeds 100%, the air in the headspace may flow backward through the piping of the air supply device 11 and reach the sterilizing filter 12.
When the pressure in the head space exceeds a predetermined pressure or may exceed the predetermined pressure due to the rise of the liquid level of the product liquid in the pressure-regulating tank 4, the air in the head space of the pressure-regulating tank 4 is discharged to the outside of the pressure-regulating tank 4 by the air discharge device 14. The pressure in the surge tank 4 drops due to the discharge of the air from the head space. When the reduced pressure is lower than the predetermined pressure, the on-off valve 16 of the air supply device 11 is opened, and sterile air is supplied to the head space of the pressure-regulating tank 4 through the air supply device 11, so that the pressure in the head space of the pressure-regulating tank 4 becomes the predetermined pressure, and the pressure inside the pressure-regulating tank 4 is maintained at a positive pressure. Then, the opening/closing valve 18 of the air discharger 14 is closed, and the discharge of the air from the head space of the pressure regulating tank 4 is stopped.
The carbonated pressure-regulating tank 6 and the pressure tank 7 for storing the product liquid provided in the vicinity of the filling device 8 are also controlled in the same manner as the pressure-regulating tank 4, whereby the adsorption of the taste of the product liquid to the sterilizing filter 12 can be prevented.
When the pressure in the head space of the pressure-regulating tank 4 rises, the supply of sterile air by the air supply device 11 is stopped, and the air in the head space is discharged to the outside of the sterile filling machine by the air discharge device 14. When the pressure in the head space decreases, the discharge of the air from the head space by the air discharge device 14 is stopped, and the supply of the sterile air by the air supply device 11 is restarted. By repeating this process, the air in the head space can be prevented from reaching the sterilizing filter 12, and the adsorption of the taste of the product liquid to the sterilizing filter 12 can be prevented.
The product liquid is filled by an aseptic filling machine, and before filling the next product liquid, it is preferable to Clean (CIP) the inside of the piping of the air supply device 11 and the air discharge device 14 constituting the positive pressure holding device in the tank. Although the product liquid does not reach the sterilizing filter 12 of the air supply device 11, droplets and smell of the product liquid may adhere to a part of the piping. In addition, the pipe of the air discharge device 14 passes through the air in the head space, and therefore droplets and the smell of the product liquid adhere thereto.
CIP in the pipes of the air supply device 11 and the air discharge device 14 is performed as shown in fig. 4. The cleaning liquid is supplied to the pressure-regulating tank 4. The cleaning liquid supplied to the pressure-regulating tank 4 is discharged from the lower portion of the pressure-regulating tank 4, and is supplied into the piping of the air supply device 11 and the air discharge device 14 by the cleaning liquid circulation pump 22. The cleaning liquid is supplied downstream of the closed on-off valve 16 provided downstream of the sterilizing filter 12 in the air supply device 11 by the cleaning liquid circulation pump 22, and the supplied cleaning liquid reaches the pressure regulating tank 4 and circulates. The cleaning liquid is also supplied into the piping of the air outlet device 14 by the cleaning liquid circulation pump 22. The cleaning liquid is supplied upstream near the open/close valve 18 in the closed state, reaches the pressure regulating tank 4, and circulates.
When the carbonation pressure regulating tank 6 and the pressure tank 7 are provided with in-tank positive pressure holding devices, CIP similar to that of the pressure regulating tank 4 is also performed.
In the case of the pressure tank 7, the cleaning liquid reaches the filling valve 10, a cap is provided to close the filling nozzle at the tip of the filling valve 10, and the cleaning liquid can be circulated by closing the tip of the filling nozzle with the cap. The inside of the pipe of the positive pressure holding device in the tank is cleaned by CIP in the pipes of the air supply device 11 and the air discharge device 14. The pressure regulating tank 4, the carbonic acid pressure regulating tank 6, and the pressure tank 7 may be subjected to CIP through communicating piping lines. Also, CIP may be performed using another piping path.
The cleaning solution is an alkaline cleaning solution prepared by adding an alkaline agent to water or an acidic cleaning solution prepared by adding a nitric acid-based or phosphoric acid-based acidic agent to water, and the alkaline agent is a mixture of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium phosphate, sodium hypochlorite, a surfactant, and a chelating agent (metal-blocking agent) such as sodium gluconate or ethylenediaminetetraacetic acid (EDTA). CIP may also be performed using an alkaline cleaning solution and an acidic cleaning solution in this order. Further, the cleaning liquid is preferably heated because the cleaning effect is improved by heating.
After CIP of the cleaning solution, the cleaning solution may be rinsed away with water or sterile water. The water or sterile water may be heated.
After CIP in the piping of the air supply device 11 and the air discharge device 14 is completed, SIP is performed in the piping of the air supply device 11 and the air discharge device 14 constituting the in-tank positive pressure holding device. The SIP in the piping of the air supply device 11 and the air discharge device 14 is performed as shown in fig. 5.
Heated water vapor is supplied to the pipe of the air supply device 11. The heating water vapor supplied between the air pressurizing device 13 and the sterilizing filter 12 reaches the pressure-regulating tank 4 through the sterilizing filter 12 because the opening/ closing valves 17 and 19 are closed and the opening/closing valve 16 is open. The inside of the pipe of the air supply device 11 and the sterilizing filter 12 are sterilized by the heat of the supplied heating steam.
The heating water vapor is directly supplied to the pressure-regulating tank 4. The supplied heating water vapor joins the heating water vapor supplied from the air supply device 11, and is discharged through the sterilizing filter 15 via the on-off valve 18 that opens the inside of the pipe of the air discharge device 14. The inside of the pipe of the air outlet device 14 and the sterilizing filter 15 are sterilized by the heat of the supplied heating steam.
The sterilizing device may be configured such that a temperature sensor S is provided at a position downstream of the sterilizing filter 12 where the heating water vapor passes, the temperature sensor S measures the temperature of the passing heating water vapor at predetermined intervals when the heating water vapor is supplied to the sterilizing filter 12, the measured temperature information is transmitted to the controller, the F value is calculated by the controller provided with an arithmetic device for calculating the F value, and the supply of the heating water vapor is stopped based on a signal from the controller when the F value reaches a target value, thereby completing the sterilization of the sterilizing filter 12.
Further, a temperature sensor S may be provided downstream of the sterilizing filter 15 through which the heating water vapor passes, and when the heating water vapor is supplied to the sterilizing filter 15, the temperature of the discharged heating water vapor may be measured at predetermined intervals by the temperature sensor S, the measured temperature information may be transmitted to the controller, the F value may be calculated by the controller provided with an arithmetic device for calculating the F value, and when the F value reaches a target value, the supply of the heating water vapor may be stopped in accordance with a signal from the controller, and the sterilization of the sterilizing filter 15 may be completed.
If the F value of the sterilizing filters 12 and 15 reaches the target value, it can be determined that sterilization is completed also in the flow paths of the sterilizing filters 12 and 15.
The F value is obtained by the following arithmetic expression based on the temperature measured by the temperature sensor S and sent to the controller.
[ formula 1]
Wherein T represents an arbitrary sterilization temperature (. degree. C.), 10(T-Tr)/ZThe lethality at an arbitrary temperature T is shown, Tr is a reference temperature (. degree. C.), and Z is a Z value (. degree. C.).
If Tr of the operation formula is 121.1 ℃, when the temperature measured by the temperature sensor S reaches 121.1 ℃, the operation device of the controller starts the operation of the F value. The Z value of sporophytes to be sterilized is 7 to 11 ℃ and can be calculated, for example, by setting the Z value to 10. The Z value and the target F value may be arbitrarily matched with the sterilization intensity required for the contents filled in the aseptic filling machine.
When the pH of the product liquid is less than 4 to 4.6, the reference temperature Tr may be set to 85 ℃ and the Z value may be set to 7.8 ℃, and when the pH of the product liquid is less than 4, the reference temperature Tr may be set to 65 ℃ and the Z value may be set to 5 ℃, and the pH may be changed as appropriate. When the pH is 4.6 or more, the pH can be calculated by setting the reference temperature Tr to 121.1 ℃ and the Z value to 10 ℃.
As described above, by calculating the F value based on the temperature measured by the temperature sensor S, not only the time required to sterilize the sterilization filters 12 and 15 and the flow paths of the air supply device 11 and the air discharge device 14, but also the time required to expose the sterilization filters 12 and 15 to the heating water vapor can be shortened, and the temperature required to expose the sterilization filters 12 and 15 to the heating water vapor can be reduced. As a result, deterioration of the support material, the filter material, the O-ring, the end cap, and the like of the filter material constituting the sterilizing filters 12 and 15 is reduced, whereby the durability of the sterilizing filters 12 and 15 can be extended.
The water is heated by electricity or fuel to become water vapor, and the water used is purified by a reverse osmosis membrane. Can body cleaners, condensate water treatment agents, and the like can be used in the can body that turns water into steam, but food additive grades need to be used. Preferably, the tank and the transfer piping are made of stainless steel. The heated water vapor passes through a filter, activated carbon, or a filter membrane except for the limit in order to remove foreign matter, ions, chemicals, and the like. Preferably, the heated water vapor generation means is a reboiler that generates heated water vapor by exchanging heat with water having passed through the reverse osmosis membrane using the heated water vapor as a heat source.
The heating water vapor supplied to the sterilizing filters 12 and 15 is 121.1 to 150 ℃. If less than 121.1 ℃, the sterilization temperature is low, and if more than 150 ℃, there is a possibility of deteriorating the components of the sterilizing filters 12 and 15.
If the carbonation pressure regulating tank 6 and the pressure tank 7 are provided with in-tank positive pressure holding means, SIP similar to the pressure regulating tank 4 is performed.
The present invention is configured as described above, but is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. The pressure tank 7 is a buffer tank provided near the filling device 8, and may be provided not above the filling device 8 but below the filling device 8. Further, the liquid may be transferred from the pressure regulating tank 4, the carbonic acid pressure regulating tank 6 or the pressure tank 7 by a liquid transfer device such as a pump, instead of being transferred under pressure.
Description of the reference numerals
4 … pressure regulating tank;
6 … pressure regulating tank for carbonic acid;
7 … pressure tank;
11 … air supply means;
12 … sterilizing filter;
13 … air pressurization means;
14 … air exhaust means;
s … temperature sensor.
Claims (7)
1. A method for maintaining a positive pressure in a tank, comprising:
an air supply step of supplying air having passed through a sterilizing filter to a head space of a tank in which a product liquid is stored, thereby setting a pressure of the head space in the tank to a predetermined positive pressure; and
and an air discharge step of stopping the air supply step and discharging the air in the head space through a path different from a path through which the air is supplied to the tank, when the pressure in the head space exceeds a predetermined positive pressure or may exceed the predetermined positive pressure.
2. The method of maintaining a positive pressure in a tank according to claim 1,
the tank is at least one of a pressure-regulating tank that stores the product liquid upstream of a filling device, a carbonated pressure-regulating tank that stores the product liquid to which carbon dioxide gas is added, and a pressure tank that is provided near the filling device that fills the product liquid into a container and stores the product liquid.
3. The method of maintaining a positive pressure in a tank according to claim 1 or 2,
the specified positive pressure is 0.001MPa to 0.8 MPa.
4. The method of maintaining a positive pressure in a tank according to any one of claims 1 to 3,
the product liquid remains in the tank after being sterilized.
5. An in-tank positive pressure holding device is characterized by comprising:
a tank to hold a product liquid;
an air supply device for supplying air having passed through the sterilizing filter to a head space of the tank so that the pressure of the head space in the tank becomes a predetermined positive pressure; and
and an air discharge device that stops supply of the air and discharges the air in the headspace through a path different from a path through which the air is supplied to the tank, when the pressure in the headspace exceeds a predetermined positive pressure or when the pressure in the headspace may exceed the predetermined positive pressure.
6. The in-tank positive pressure retention apparatus according to claim 5,
the tank is at least one of a pressure regulating tank for storing the product liquid at an upstream side of a filling device, a carbonated pressure regulating tank for storing the product liquid to which carbon dioxide gas is added, and a pressure tank which is provided in the vicinity of the filling device for filling the product liquid into a container and stores the product liquid.
7. The in-tank positive pressure retention apparatus according to claim 5 or 6,
a sterilizing device for sterilizing the product liquid is provided upstream of the tank.
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| JP2018-102569 | 2018-05-29 | ||
| JP2018102569A JP6836548B2 (en) | 2018-05-29 | 2018-05-29 | Positive pressure holding method in tank and positive pressure holding device in tank |
| PCT/JP2019/020870 WO2019230642A1 (en) | 2018-05-29 | 2019-05-27 | Method for maintaining positive pressure inside tank and device for maintaining positive pressure inside tank |
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| CN112188982A true CN112188982A (en) | 2021-01-05 |
| CN112188982B CN112188982B (en) | 2022-10-21 |
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| CN201980035024.1A Active CN112188982B (en) | 2018-05-29 | 2019-05-27 | Method for maintaining positive pressure in tank and device for maintaining positive pressure in tank |
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| JP (1) | JP6836548B2 (en) |
| CN (1) | CN112188982B (en) |
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| JP7245453B1 (en) * | 2021-10-14 | 2023-03-24 | 大日本印刷株式会社 | Content filling system and sterilization method |
| JP7233505B1 (en) * | 2021-10-14 | 2023-03-06 | 大日本印刷株式会社 | Water sterilizer and contents filling system |
| JP7300116B2 (en) * | 2021-10-14 | 2023-06-29 | 大日本印刷株式会社 | Content filling system and sterilization method |
| JP7276732B2 (en) * | 2021-10-14 | 2023-05-18 | 大日本印刷株式会社 | Content filling system and sterilization method |
| EP4269256A1 (en) * | 2021-10-14 | 2023-11-01 | Dai Nippon Printing Co., Ltd. | Content filling system and sterilization method |
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| JP6836548B2 (en) | 2021-03-03 |
| JP2019206366A (en) | 2019-12-05 |
| WO2019230642A1 (en) | 2019-12-05 |
| CN112188982B (en) | 2022-10-21 |
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