Contents filling system and processing method

Abstract

The present invention provides a content filling system and a cleaning method that can improve the cleanability during the cleaning process of the content filling system. [Solution] The contents filling system 10 comprises a contents sterilization device 40, a filling device 20, and a control unit 60. The contents sterilization device 40 has a heat exchange unit 50 including heat exchangers 51a to 51c and a heating unit 52. The heat exchange unit 50 has a first inlet 50a, a first outlet 50b, a second inlet 50c, and a second outlet 50d, and the first outlet 50b and the second inlet 50c are connected via the heating unit 52. The control unit 60 performs a forward flow process in which the processed fluid passes through the first inlet 50a, the first outlet 50b, the heating unit 52, the second inlet 50c, and the second outlet 50d in that order, and a reverse flow process in which the processed fluid passes through the second outlet 50d, the second inlet 50c, the heating unit 52, the first outlet 50b, and the first inlet 50a in that order.

Description

Technical Field

[0001] The present disclosure relates to a content filling system and a processing method.

Background Art

[0002] Conventionally, using a filling machine provided in a content filling system, a content such as a beverage has been continuously and aseptically filled into a large number of plastic bottles being conveyed at high speed. In such a content filling system, a filling nozzle for filling the content into a plastic bottle is disposed rotatably within a sterile chamber. (See, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, the flow channels through which the contents pass in a content filling system are cleaned periodically or when switching between types of products being manufactured using a Cleaning in Place (CIP) process. Furthermore, a Sterilizing in Place (SIP) process is performed to sterilize the flow channels. The CIP process is carried out by flowing a cleaning solution, for example, water with an alkaline agent added, through the flow channels from the beverage supply piping to the filling nozzle of the filling machine, either before or after this cleaning solution. Examples of alkaline agents include caustic soda (sodium hydroxide), potassium hydroxide, sodium carbonate, sodium silicate, sodium phosphate, or sodium hypochlorite. Examples of acidic agents include nitric acid, phosphoric acid, or organic acids. Surfactants and defoamers may also be added to the cleaning solution. The SIP process is a process to sterilize the flow channels before the product filling operation begins. For example, high-temperature sterilization is performed by flowing heated steam or hot water through the flow channels that have been cleaned using the CIP process. Patent Document 3 discloses a plate-type heat exchanger for sterilization in which the processing liquid is flowed in the opposite direction to the product flow direction.

[0005] This disclosure provides a content filling system and a processing method that can improve the cleanability during the cleaning process of the content filling system. [Means for solving the problem]

[0006] Embodiments of this disclosure relate to the following [1] to

[14] .

[0007] [1] A contents filling system for filling contents, comprising: a contents sterilization device for sterilizing the contents; a filling device for filling the contents sterilized by the contents sterilization device; and a control unit for controlling the contents filling system, wherein the contents sterilization device comprises a heat exchange unit including at least one heat exchanger and a heating unit connected to the heat exchange unit, the heat exchange unit having a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet, the first outlet and the second inlet being connected via the heating unit, and the control unit performing a forward flow process in which a processing fluid passes through the first inlet, the first outlet, the heating unit, the second inlet and the second outlet in that order, and a reverse flow process in which the processing fluid passes through the second outlet, the second inlet, the heating unit, the first outlet and the first inlet in that order.

[0008] [2] The contents sterilization device is the contents filling system according to [1], having a holding tube.

[0009] [3] The contents filling system according to [1] or [2], further comprising a temperature adjustment unit for adjusting the temperature of the contents sterilized in the contents sterilization device to the filling temperature.

[0010] [4] The control unit performs the cleaning process in the order of forward flow processing, backflow processing, and forward flow processing, the contents filling system according to any one of [1] to [3].

[0011] [5] The contents filling system according to any one of [1] to [4], wherein the processing fluid is heated by the heating unit in the forward flow processing and the reverse flow processing.

[0012] [6] The contents filling system according to any one of [1] to [5], further comprising a first tank connected to the contents sterilization device.

[0013] [7] The contents filling system according to [6], further comprising a circulation pipe connecting the position between the contents sterilization device and the filling device and the first tank.

[0014] [8] The contents filling system according to [7], wherein an additional heat exchanger is provided in the circulation piping, the first tank is connected to the contents sterilization device via contents supply piping, and the additional heat exchanger performs heat exchange between the processed fluid flowing through the contents supply piping and the processed fluid flowing through the circulation piping.

[0015] [9] The contents filling system according to [2], wherein the pressure of the processing fluid passing after the holding tube in the heat exchange unit is higher than the pressure of the processing fluid passing before the holding tube.

[0016]

[10] A processing method for cleaning or sterilizing a contents filling system for filling contents, wherein the contents filling system comprises a contents sterilization device for sterilizing the contents, and a filling device for filling the contents sterilized in the contents sterilization device, the contents sterilization device having a heat exchange unit including at least one heat exchanger, and a heating unit connected to the heat exchange unit, the heat exchange unit having a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet, and the processing method comprising a forward flow processing step of passing a processing fluid in the order of the first inlet, the first outlet, the heating unit, the second inlet and the second outlet, and a reverse flow processing step of passing the processing fluid in the order of the second outlet, the second inlet, the heating unit, the first outlet and the first inlet.

[0017]

[11] The processing method according to

[10] , wherein the washing process is performed in the order of the forward flow processing step, the reverse flow processing step, and the forward flow processing step.

[0018]

[12] The processing method according to

[10] or

[11] , wherein the final step of the processing method is the forward flow processing step.

[0019]

[13] An alkaline cleaning treatment step, which is the forward flow treatment step or the reverse flow treatment step, and an acidic cleaning treatment step, which is the forward flow treatment step or the reverse flow treatment step, are included. The alkaline cleaning treatment step is performed before or after the acidic cleaning treatment step, and no rinsing treatment is performed between the alkaline cleaning treatment step and the acidic cleaning treatment step. The treatment method according to any one of

[10] to

[12] .

[0020]

[14] The alkaline cleaning treatment step is performed immediately after the acidic cleaning treatment step, or the acidic cleaning treatment step is performed immediately after the alkaline cleaning treatment step, and the difference between the pH of the treatment fluid used in the alkaline cleaning treatment step and the pH of the treatment fluid used in the acidic cleaning treatment step is 8 or more and 12 or less. The treatment method according to

[13] . [Effect of the Invention]

[0021] According to the present disclosure, the cleaning property during the cleaning treatment of the content filling system can be enhanced. [Brief Description of the Drawings]

[0022] [Figure 1] FIG. 1 is a schematic plan view showing a content filling system according to an embodiment. [Figure 2] FIG. 2 is a schematic view showing a content sterilizer of a content filling system and the flow path around it according to an embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view showing a heat exchanger of a heat exchange unit. [Figure 4] FIG. 4 is a schematic view showing the flow of the treatment fluid during forward flow treatment. [Figure 5] FIG. 5 is a schematic view showing the flow of the treatment fluid during reverse flow treatment. [Figure 6] FIGS. 6(a)-(e) are tables showing the treatment patterns of the cleaning treatment and the sterilization treatment. [Figure 7] FIGS. 7(a)-(c) are tables showing the treatment patterns of the cleaning treatment and the sterilization treatment. [Modes for carrying out the invention]

[0023] Hereinafter, one embodiment will be described with reference to Figures 1 to 7. Figures 1 to 7 are diagrams illustrating one embodiment. In the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations may be omitted.

[0024] (Contents filling system) First, the overall configuration of the contents filling system (aseptic filling system) according to this embodiment will be explained with reference to Figures 1 and 2.

[0025] The contents filling system 10 shown in Figure 1 is a system for filling a bottle (container) 90 with contents such as a beverage. The bottle 90 can be manufactured by biaxial stretch blow molding a preform 91 made by injection molding of a synthetic resin material. The bottle 90 may also be manufactured by direct blow molding. As the material for the bottle 90, it is preferable to use a thermoplastic resin, especially PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate). In addition, the container may be glass, a can, paper, a pouch, a cup, or a composite container thereof. In this embodiment, the case in which a synthetic resin bottle is used as the container will be described as an example.

[0026] As shown in Figure 1, the contents filling system 10 comprises a contents sterilization device 40, a filling device 20, and a control unit 60. The contents sterilization device 40 pre-sterilizes the contents to be filled into the bottle 90. The filling device 20 fills the contents that have been sterilized in the contents sterilization device 40. The control unit 60 controls the contents filling system 10.

[0027] The contents filling system 10 further comprises a bottle forming unit 30, a container sterilization device 11, an air rinsing device 14, the aforementioned filling device 20, a capping device (capper, crimping and sealing machine) 16, and a product bottle discharge unit 19. These bottle forming unit 30, container sterilization device 11, air rinsing device 14, filling device 20, capping device 16, and product bottle discharge unit 19 are arranged in this order from upstream to downstream along the direction of transport of the bottles 90. In addition, multiple transport wheels 12 are provided between the air rinsing device 14, filling device 20, and capping device 16, etc., to transport the bottles 90 between these devices. Here, the bottle forming unit 30, container sterilization device 11, air rinsing device 14, filling device 20, capping device 16, and product bottle discharge unit 19 will be described.

[0028] The bottle molding unit 30 receives the preform 91 from the outside and molds the bottle 90. The bottle molding unit 30 then transports the molded bottle 90 toward the container sterilization device 11. This allows the contents filling system 10 to continuously perform the processes from supplying the preform 91 to molding the bottle 90, filling the bottle 90 with contents, and sealing it. In this case, the preform 91, which has a smaller volume, is transported to the contents filling system 10 from the outside, rather than the larger volume bottle 90. Therefore, transportation costs can be reduced. Alternatively, the bottle molding unit 30 may be connected to an injection molding machine (not shown), and the preform 91 may be manufactured from resin pellets. In this case, transportation costs can be further reduced compared to transporting the preform 91 from the outside.

[0029] The bottle molding unit 30 includes a preform transport unit 31, a blow molding unit (container molding device) 32, and a bottle transport unit 33. The preform transport unit 31 transports the preform 91. The blow molding unit 32 blows the preform 91 that has been sent from the preform transport unit 31 to form a bottle 90 from the preform 91. The bottle transport unit 33 transports the bottle 90 formed in the blow molding unit 32.

[0030] The preform transport section 31 includes a preform receiving section 34, a preform heating section 35, and a preform transfer section 36. Of these, the preform receiving section 34 receives the preform 91 supplied from the preform supply device 37 via the preform supply conveyor 37a. The preform receiving section 34 is equipped with a preform sterilization device 34a for sterilizing the preform 91 and a preform air rinsing device 34b for air rinsing the preform 91.

[0031] In the preform receiving section 34, the preform sterilization device 34a sprays hydrogen peroxide aqueous solution gas or mist onto the preform 91, thereby sterilizing the preform 91 (preliminary sterilization). The disinfectant used to sterilize the preform 91 can be any disinfectant that has the property of inactivating microorganisms. For example, in addition to hydrogen peroxide, peracetic acid, acetic acid, pernitrate, nitric acid, chlorine-based agents, sodium hydroxide, potassium hydroxide, alcohols such as ethyl alcohol and isopropyl alcohol, chlorine dioxide, ozonated water, acidic water, and surfactants may be used individually or in combination of two or more of these.

[0032] In this way, by pre-sterilizing the preform 91 with the preform sterilization device 34a (pre-sterilization), the number of bacteria adhering to the bottle 90 produced from the preform 91 can be reduced. Therefore, the amount of hydrogen peroxide used in the container sterilization device 11 for sterilizing the bottle 90 can be reduced, and the sterilization time can be shortened. Generally, the amount of disinfectant used to sterilize the small volume preform 91 is less than the amount of disinfectant used to sterilize the bottle 90. Therefore, by pre-sterilizing the preform 91, the total amount of disinfectant used can be reduced.

[0033] Furthermore, the amount of hydrogen peroxide used in the container sterilization device 11 can be reduced, and the sterilization time can be shortened, allowing the container sterilization device 11 to be made smaller. In addition, since the sterilization time for sterilizing the bottles 90 can be shortened, the heat load on the bottles 90 can be reduced. As a result, even with lightweight bottles 90 or bottles 90 made from recycled PET, deformation of the bottles 90 due to the heat of the disinfectant can be suppressed.

[0034] Furthermore, this sterilization process may be performed not only in the preform receiving section 34, but also in the preform heating section 35 or the preform transfer section 36. Additionally, the sterilization process may be performed after the bottle 90 has been formed, between the bottle transport section 33 and the filling device 20. Moreover, the sterilization process may be performed at multiple locations. In addition, instead of using a disinfectant, bacteria may be inactivated by ultraviolet irradiation or electron beam irradiation.

[0035] Downstream of the preform sterilization device 34a, the preform air rinsing device 34b described above is provided. The preform 91, to which the disinfectant has been sprayed, is dried with hot air in the preform air rinsing device 34b. At this time, it is preferable that the hot air is supplied to the preform 91 with its opening facing downwards. This effectively removes foreign matter from inside the preform 91. Therefore, the step of washing the preform 91 with sterile water can be omitted, and the amount of carbon dioxide emitted by the contents filling system 10 can be reduced. Note that the preform air rinsing device 34b is not required to be provided in the preform receiving section 34. In addition, a foreign matter removal device (not shown) for removing foreign matter adhering to the preform 91 may be provided upstream of the preform sterilization device 34a in the preform receiving section 34.

[0036] The preform heating unit 35 is configured to receive the preform 91 from the preform receiving unit 34 and heat the preform 91 while transporting it. The preform heating unit 35 is equipped with a heater 35a for heating the preform 91. This heater 35a may be, for example, an infrared heater. The heater 35a heats the preform 91 to, for example, 90°C to 130°C. The temperature of the opening of the preform 91 is kept below 70°C to prevent deformation.

[0037] The preform transfer unit 36 ​​is configured to receive the preform 91 heated by the preform heating unit 35 and transfer it to the blow molding unit 32.

[0038] The blow molding section 32 includes a mold (not shown). By blow molding the preform 91 using this mold, a bottle 90 is formed. The formed bottle 90 is then transported downstream by the bottle transport section 33.

[0039] Here, between the bottle molding unit 30 and the container sterilization device 11, there is an adjustment and conveying unit 38 that receives bottles 90 from the bottle conveying unit 33 and delivers the bottles 90 to the container sterilization device 11. At least a portion of this adjustment and conveying unit 38 is housed inside an atmosphere isolation chamber 70c (described later) located upstream of the disinfectant spray chamber 70d (described later). In the illustrated example, the adjustment and conveying unit 38 is positioned to straddle the molding unit chamber 70b (described later) that houses the bottle molding unit 30 and the atmosphere isolation chamber 70c. In this way, at least a portion of the adjustment and conveying unit 38 is housed inside the atmosphere isolation chamber 70c, which prevents disinfectant gas or mist, or mixtures thereof, generated in the disinfectant spray chamber 70d from flowing into the molding unit chamber 70b.

[0040] In the illustrated example, a single transport wheel 12 is provided between the adjustment transport unit 38 and the bottle transport unit 33. That is, the bottle transport unit 33 of the bottle molding unit 30, a single transport wheel 12, and the adjustment transport unit 38 are provided between the blow molding unit 32 of the bottle molding unit 30 and the container sterilization device 11. This makes the contents filling system 10 more compact compared to the case where multiple transport wheels 12 are provided between the adjustment transport unit 38 and the bottle transport unit 33 of the bottle molding unit 30. Although not shown in the illustration, the contents filling system 10 may also be provided only between the blow molding unit 32 of the bottle molding unit 30 and the container sterilization device 11. In this case, the contents filling system 10 can be made even more compact. Furthermore, if the contents are filled while molding is performed in the blow molding unit 32, the contents filling system 10 can be made even more compact.

[0041] The container sterilization device 11 is a device that sterilizes bottles 90 by spraying a disinfectant onto them. This sterilizes the bottles 90 with the disinfectant before they are filled with contents. For example, an aqueous hydrogen peroxide solution is used as the disinfectant. In the container sterilization device 11, a gas or mist of the aqueous hydrogen peroxide solution is generated and sprayed onto the inner and outer surfaces of the bottles 90. In this way, the bottles 90 are sterilized with the gas or mist of the aqueous hydrogen peroxide solution, ensuring that the inner and outer surfaces of the bottles 90 are sterilized evenly.

[0042] The air rinsing device 14 is a device that removes foreign matter and hydrogen peroxide from inside the bottle 90 while activating hydrogen peroxide by supplying sterile heated air or sterile room temperature air to the bottle 90. In this case, it is preferable that sterile air is supplied to the bottle 90 with the mouth of the bottle 90 facing downwards. This allows for effective removal of foreign matter from inside the bottle 90. As a result, the step of washing the bottle 90 with sterile water can be omitted, saving water. The amount of carbon dioxide emitted by the contents filling system 10 can also be reduced. If necessary, a low-concentration hydrogen peroxide condensation mist may be mixed with sterile room temperature air to gasify the hydrogen peroxide and supply it to the bottle 90.

[0043] The filling device 20 is a device that fills bottles 90 with the contents of a beverage or the like. That is, the filling device 20 fills the contents into the bottle 90 from the mouth of the bottle 90. In this way, the filling device 20 fills empty bottles 90 with contents. In this filling device 20, multiple bottles 90 are rotated and conveyed while the contents are filled into the inside of the bottles 90. The filling device 20 is located inside the sterile chamber 70f, which will be described later. The filling device 20 may be a so-called rotary filler having multiple rotatable filling nozzles 22, or it may be a filler that conveys bottles 90 in a linear manner. Further details of the filling device 20 will be described later.

[0044] The capping device 16 is a device that seals a bottle 90 by attaching a cap 92 to it. In the capping device 16, the bottle 90 filled with contents is closed with the cap 92. This seals the bottle 90 so that outside air and microorganisms do not enter it. In the capping device 16, while holding multiple bottles 90 filled with contents, the cap 92 is rotated (revolved) and attached to the mouth of each bottle. By attaching the cap 92 to the bottle 90 in this way, a product bottle 95 is obtained.

[0045] The caps 92 are sterilized in advance by a cap sterilization device 18. The cap sterilization device 18 is located, for example, outside the sterile chamber 70f and near the cap mounting device 16. In the cap sterilization device 18, the caps 92 brought in from outside the contents filling system 10 are collected in advance and transported in a line toward the cap mounting device 16. On their way toward the cap mounting device 16, hydrogen peroxide gas or mist is sprayed onto the inner and outer surfaces of the caps 92, and then they are dried with hot air and sterilized.

[0046] The product bottle discharge unit 19 continuously discharges product bottles 95, which have been fitted with caps 92 by the cap attachment device 16, toward the outside of the contents filling system 10.

[0047] The contents filling system 10 includes a preform sterilization chamber 70a, a molding chamber 70b, an atmosphere isolation chamber 70c, a disinfectant spray chamber 70d, an air rinse chamber 70e, a sterile chamber 70f, and an outlet chamber 70g. The preform sterilization chamber 70a, molding chamber 70b, atmosphere isolation chamber 70c, disinfectant spray chamber 70d, air rinse chamber 70e, sterile chamber 70f, and outlet chamber 70g are arranged in this order from upstream to downstream along the transport direction of the preform 91 and bottle 90.

[0048] Each chamber 70a to 70g is separated by a partition wall. The partition wall prevents the disinfectant or other substances from flowing in unintended directions between each chamber 70a to 70g and stabilizes the pressure within each chamber 70a to 70g. A gap is formed in each partition wall that is large enough for a preform 91 or bottle 90 to pass through. This gap is formed to a minimum size, for example, about the size of one preform 91 or bottle 90, so as not to change the pressure within each chamber 70a to 70g. Furthermore, a shutter may be provided in the partition wall to close the aforementioned gap. This shutter may be configured to open and close automatically, for example, by a signal from the control unit 60.

[0049] Of the chambers 70a to 70g, the preform sterilization chamber 70a houses the preform sterilization device 34a, etc. The molding chamber 70b houses the blow molding section 32 of the bottle molding section 30, etc. At least a part of the adjustment and conveying section 38 is housed inside the atmosphere isolation chamber 70c. The disinfectant spray chamber 70d houses the container sterilization device 11. The air rinsing chamber 70e houses the air rinsing device 14. The sterile chamber 70f houses the filling device 20, the conveying wheel 12, and the capping device 16. Furthermore, the product bottle discharge section 19 is housed inside the outlet chamber 70g.

[0050] As described above, the contents filling system 10 includes a control unit 60 that controls the contents filling system 10. This control unit 60 is electrically connected to the bottle molding unit 30, the container sterilization device 11, the air rinsing device 14, the filling device 20, the cap attachment device 16, the product bottle discharge unit 19, and the cap sterilization device 18, and may control these devices. This control unit 60 may also clean and sterilize the inside of each chamber. In this embodiment, the control unit 60 cleans the inside of the sterile chamber 70f (cleaning the inside of each chamber is also called COP).

[0051] Such a contents filling system 10 may consist of, for example, a sterile filling system. In this case, the insides of the disinfectant spray chamber 70d, the air rinse chamber 70e, the sterile chamber 70f, and the outlet chamber 70g are kept sterile. A chamber (not shown) connecting a sterile zone and a non-sterile zone may be provided downstream of the outlet chamber 70g.

[0052] Next, the configuration of the contents sterilization device 40 and the filling device 20 of the contents filling system 10 will be explained using Figure 2. Figure 2 is a configuration diagram showing the contents sterilization device 40, the filling device 20 and their surroundings, as part of the contents filling system 10 described above.

[0053] As shown in Figure 2, the contents filling system 10 includes a contents sterilization device 40 and a filling device 20. The contents filling system 10 further includes a contents mixing unit 41, a first tank 42, a temperature control unit 43, and a second tank 44.

[0054] The contents mixing unit 41, the first tank 42, the contents sterilization device 40, the temperature control unit 43, and the second tank 44 are connected by contents supply system piping 45a to 45d. During filling, the contents, such as beverages, pass sequentially through the contents supply system piping 45a to 45d. During the cleaning process (CIP process), a processing fluid such as a rinse solution, alkaline cleaning solution, or acidic cleaning solution is flowed through the contents supply system piping 45a to 45d. During the sterilization process (SIP process), for example, a processing fluid such as heated steam or hot water is flowed through the contents supply system piping 45a to 45d that has been cleaned by the CIP process, thereby performing sterilization at high temperatures. In this specification, the processing fluid may be any of the following: rinse solution, alkaline cleaning solution, acidic cleaning solution, heated steam, or hot water.

[0055] The contents blending unit 41 blends the contents from beverage ingredients. Beverage ingredients include sweeteners, fruit juices, plant extracts, dairy products, flavorings, acidity adjusters, vitamins, etc. The contents may also be prepared by mixing one or more of the above beverage ingredients with drinking water in a predetermined ratio. The contents may be beverages such as soda, cola, and other carbonated drinks, beer and other alcoholic beverages, tea, functional beverages, juices, coffee, milk, and milk-based beverages. The contents may also be food seasonings such as soy sauce. Alternatively, the contents may be water, purified water, deionized water, purified water, ultrapure water, or non-drinking liquids.

[0056] The contents mixing unit 41 is connected to the first tank 42 via the contents supply system piping 45a. The contents from the contents mixing unit 41 are supplied to this first tank 42.

[0057] The first tank 42 is connected to the contents sterilization device 40 via contents supply piping 45b. A pump 46 is provided in the middle of the contents supply piping 45b to send the contents from the first tank 42 to the contents sterilization device 40. The first tank 42 is connected to a processing fluid input section 47 into which the processing fluid described above is introduced.

[0058] The contents sterilization device 40 sterilizes the contents of a beverage, for example. The contents sterilization device 40 has a heat exchange unit 50 and a heating unit 52. The heat exchange unit 50 includes heat exchangers 51a to 51c. The heating unit 52 is connected to the heat exchange unit 50. The contents sterilization device 40 further has a holding tube 53 connected to the heat exchange unit 50 and the heating unit 52.

[0059] In this case, the heat exchange unit 50 includes multiple (three in Figure 2) heat exchangers 51a to 51c. That is, the heat exchange unit 50 includes a first heat exchanger 51a, a second heat exchanger 51b, and a third heat exchanger 51c. The heat exchangers 51a to 51c are connected in series within the heat exchange unit 50. The heat exchangers 51a to 51c are shell-and-tube heat exchangers, but are not limited to this type; plate heat exchangers may also be used. Note that the heat exchange unit 50 only needs to include at least one heat exchanger.

[0060] The heat exchange unit 50 has a first inlet 50a, a first outlet 50b, a second inlet 50c, and a second outlet 50d. The first inlet 50a is connected to the contents supply system piping 45b. During filling, contents sent from the contents supply system piping 45b flow into the first inlet 50a. The contents that flow in from the first inlet 50a pass through each heat exchanger 51a to 51c and are sent to the first outlet 50b. During this time, the contents undergo heat exchange inside each heat exchanger 51a to 51c and flow out from the first outlet 50b. The contents that flow out from the first outlet 50b are sent to the heating section 52.

[0061] The second inlet 50c is connected to the heating section 52. That is, the first outlet 50b and the second inlet 50c are connected via the heating section 52. During filling, the contents sent from the heating section 52 flow into the second inlet 50c. The contents that flow in from the second inlet 50c pass through each heat exchanger 51c to 51a and are sent to the second outlet 50d. The contents that flow in from the second inlet 50c undergo heat exchange inside each heat exchanger 51c to 51a and flow out from the second outlet 50d. The second outlet 50d is connected to the contents supply system piping 45c. The contents that flow out from the second outlet 50d are sent to the temperature control section 43 via the contents supply system piping 45c.

[0062] Each heat exchanger 51a to 51c has a tube-side inlet 54a, a tube-side outlet 54b, a shell-side inlet 54c, and a shell-side outlet 54d. The tube-side inlet 54a is located at one end of each heat exchanger 51a to 51c in the longitudinal direction. The tube-side outlet 54b is located at the other end of each heat exchanger 51a to 51c in the longitudinal direction. In each heat exchanger 51a to 51c, the tube-side inlet 54a and the tube-side outlet 54b are positioned opposite each other in the longitudinal direction of each heat exchanger 51a to 51c. The shell-side inlet 54c is located in the shell near the other end of each heat exchanger 51a to 51c in the longitudinal direction. The shell-side outlet 54d is located in the shell near one end of each heat exchanger 51a to 51c in the longitudinal direction. In each heat exchanger 51a to 51c, the shell-side inlet 54c and shell-side outlet 54d are oriented perpendicular to the longitudinal direction of the heat exchangers 51a to 51c, but are not limited to this. The shell-side inlet 54c and shell-side outlet 54d may be oriented at an angle to the longitudinal direction of the heat exchangers 51a to 51c.

[0063] During the filling of the contents, the contents supplied from the contents supply system piping 45b flow into the pipe-side inlet 54a. The pipe-side inlet 54a communicates with the pipe-side outlet 54b inside each heat exchanger 51a to 51c. The contents flowing in from the pipe-side inlet 54a undergo heat exchange inside each heat exchanger 51a to 51c and flow out from the pipe-side outlet 54b. The contents flowing out from the pipe-side outlet 54b are sent to the heating section 52. Also, during the filling of the contents, the contents supplied from the heating section 52 flow into the shell-side inlet 54c. The shell-side inlet 54c communicates with the shell-side outlet 54d inside each heat exchanger 51a to 51c. The contents flowing in from the shell-side inlet 54c undergo heat exchange inside each heat exchanger 51a to 51c and flow out from the shell-side outlet 54d.

[0064] Within the contents sterilization device 40, the contents supply system piping 45b is connected to the pipe-side inlet 54a of the first heat exchanger 51a. The pipe-side outlet 54b of the first heat exchanger 51a and the pipe-side inlet 54a of the second heat exchanger 51b are connected by connecting piping 55a. The pipe-side outlet 54b of the second heat exchanger 51b and the pipe-side inlet 54a of the third heat exchanger 51c are connected by connecting piping 55b. Furthermore, the circulation system piping 56 is connected to the pipe-side outlet 54b of the third heat exchanger 51c. The circulation system piping 56 is connected to the shell-side inlet 54c of the third heat exchanger 51c. The circulation system piping 56 is provided with the aforementioned heating section 52 and holding tube 53. Furthermore, the shell-side outlet 54d of the third heat exchanger 51c and the shell-side inlet 54c of the second heat exchanger 51b are connected by a connecting pipe 55c. In addition, the shell-side outlet 54d of the second heat exchanger 51b and the shell-side inlet 54c of the first heat exchanger 51a are connected by a connecting pipe 55d.

[0065] The heating unit 52 heats the contents flowing through the circulation system piping 56 to the final sterilization temperature. The heating unit 52 may also be a heater. For example, a heat exchanger may be used as this heater.

[0066] The holding tube 53 is located downstream of the heating section 52 in the circulation system piping 56. The holding tube 53 includes coiled curved tubes, straight tubes, or spiral tubes, and undergoes heat treatment or sterilization treatment as it flows through it. The contents are set to pass through the holding tube 53 for a predetermined residence time or longer. In this way, the contents or fluid such as the processing fluid remain in the holding tube 53 while maintaining a certain residence time (holding time) and sterilization temperature, thereby ensuring the sterility of the fluid.

[0067] The contents sterilization device 40 is connected to the temperature control unit 43 via the contents supply system piping 45c. The temperature control unit 43 is a device for adjusting the temperature of the contents sterilized in the contents sterilization device 40 to the filling temperature. The temperature control unit 43 may also be a cooling device that lowers the temperature of the contents. The temperature control unit 43 may also be a heat exchanger. The temperature control unit 43 has a third inlet 43a, a third outlet 43b, a fourth inlet 43c, and a fourth outlet 43d. The contents from the contents supply system piping 45c flow into the third inlet 43a. The contents that flowed in from the third inlet 43a flow out of the third outlet 43b. A temperature-controlled liquid such as cooling water flows into the fourth inlet 43c. The temperature-controlled liquid that flowed in from the fourth inlet 43c flows out of the fourth outlet 43d. In the temperature control section 43, heat exchange takes place between the contents flowing in from the third inlet 43a and the temperature-controlled liquid flowing in from the fourth inlet 43c, thereby adjusting the temperature of the contents flowing out from the third outlet 43b. However, if the allowable temperature range of the contents to be filled by the filling device 20 is wide (for example, 30°C ± 20°C), the temperature control section 43 does not need to be provided. In this case, the flow path of the contents from the fifth branch section 62e may be switched to the circulation piping 63c side. After that, the temperature of the contents may be adjusted while circulating the contents until the temperature of the contents at the second outlet 50d reaches the allowable temperature range of the manufacturing temperature. Also, if the filling temperature of the contents is medium to high temperature (for example, 50°C to 100°C), the contents may be directly supplied to the filling device 20 from a point in the heat exchanger (for example, the third heat exchanger 51c or the second heat exchanger 51b).

[0068] The temperature control unit 43 is connected to the second tank 44 via the contents supply system piping 45d. The contents from the contents supply system piping 45d are stored in the second tank 44. The second tank 44 temporarily stores the contents whose temperature has been controlled by the temperature control unit 43. The second tank 44 may also be called a filling head tank or a buffer tank. The second tank 44 may be located in the upper part of the filling device 20.

[0069] In the filling device 20, the contents stored in the second tank 44 are filled into empty bottles 90. The filling device 20 has a rotating wheel 21. Multiple bottles 90 are rotated (revolved) by this rotating wheel 21 as the contents are filled into the inside of the bottles 90. Multiple filling nozzles 22 are arranged along the outer circumference of the rotating wheel 21. One bottle 90 is attached to each filling nozzle 22, and the contents are injected into the inside of the bottles 90 from the filling nozzle 22. A contents supply line 23 is connected to the filling nozzles 22. One end of the contents supply line 23 is connected to the second tank 44 which has been filled with contents, and the other end communicates with the inside of the bottles 90. The contents supplied from the second tank 44 pass through the contents supply line 23 and are injected into the inside of the bottles 90.

[0070] The rotating wheel 21 and the filling nozzle 22 are covered by a chamber 24 made of, for example, stainless steel plate. A rotary joint 25 is attached to the top of the chamber 24. This rotary joint 25 seals the rotating parts (rotating wheel 21 and filling nozzle 22, etc.) and the non-rotating parts (chamber 24, etc.) in a sterile manner.

[0071] Furthermore, a first branch section 62a and a second branch section 62b are provided in the middle of the contents supply system piping 45b. The first circulation pipe 63a is connected to the first branch section 62a. The first circulation pipe 63a is connected to the third circulation pipe 63c, which will be described later, at the third branch section 62c. The second circulation pipe 63b is connected to the second branch section 62b. The second circulation pipe 63b is connected to the third circulation pipe 63c, which will be described later, at the fourth branch section 62d. Furthermore, a fifth branch section 62e is provided in the middle of the contents supply system piping 45d. The third circulation pipe 63c is connected to the fifth branch section 62e. The third circulation pipe 63c is connected to the first tank 42.

[0072] A fourth heat exchanger 66 (an additional heat exchanger) is provided in the middle of the third circulation pipe 63c. The fourth heat exchanger 66 performs heat exchange between the processing fluid flowing through the contents supply pipe 45b and the processing fluid flowing through the third circulation pipe 63c. During the cleaning process (CIP process), the fourth heat exchanger 66 uses the temperature of the processing fluid discharged from the contents sterilization device 40 to raise the temperature of the processing fluid flowing into the contents sterilization device 40.

[0073] The fourth heat exchanger 66 has a fifth inlet 66a, a fifth outlet 66b, a sixth inlet 66c, and a sixth outlet 66d. Contents from the contents supply system piping 45b flow into the fifth inlet 66a. Alternatively, the fifth inlet 66a allows the processed fluid to flow in or out. Contents that flowed in from the fifth inlet 66a flow out from the fifth outlet 66b. Alternatively, the fifth outlet 66b allows the processed fluid to flow out or in. Processed fluid passing through the third circulation piping 63c flows into or out of the sixth inlet 66c. Processed fluid passing through the sixth inlet 66c flows into or out of the sixth outlet 66d. In the fourth heat exchanger 66, heat exchange takes place between the processed fluid flowing in from the fifth inlet 66a and the processed fluid flowing in from the sixth inlet 66c, and the temperature of the processed fluid flowing out from the fifth outlet 66b is adjusted. Alternatively, in the fourth heat exchanger 66, heat exchange takes place between the processed fluid flowing in from the sixth outlet 66d and the processed fluid flowing in from the fifth outlet 66b, thereby adjusting the temperature of the processed fluid flowing out from the sixth inlet 66c.

[0074] A first valve 64a is provided in the contents supply piping 45b between the first branch 62a and the second branch 62b. A second valve 64b is provided in the first circulation piping 63a. A third valve 64c is provided in the second circulation piping 63b. A fourth valve 64d is provided in the contents supply piping 45d between the fifth branch 62e and the filling device 20. Furthermore, a fifth valve 64e is provided in the third circulation piping 63c between the third branch 62c and the fourth branch 62d. The opening and closing of these first valves 64a to the fifth valves 64e are controlled by the control unit 60.

[0075] A back pressure valve 48 is provided in the contents supply piping 45d, between the temperature control section 43 and the fifth branch section 62e. The back pressure valve 48 allows for adjustment of the flow rate and internal pressure of the contents supply piping 45d. This ensures that, in forward flow, the fluid supply pressure of the processed fluid passing after the holding tube 53 in the heat exchange unit 50 is higher than the fluid supply pressure of the processed fluid passing before the holding tube 53. Specifically, in forward flow, the fluid pressure at the shell-side outlet 54d in each of the heat exchangers 51c to 51a is made higher than the fluid pressure at the pipe-side outlet 54b. When back pressure is applied when the maximum temperature of the processed fluid passing through the contents sterilization device 40 is 100°C or higher, the pressure in the piping of the contents sterilization device 40 increases. In this state, it is advisable to install one or more booster pumps (not shown) between the pump 46 and the holding tube 53 to control the fluid supply pressure to maintain the above pressure balance. More preferably, the booster pump is installed between the heating unit 52 and the third heat exchanger 51c, or between the third heat exchanger 51c and the second heat exchanger 51b. That is, by installing one or more back pressure valves 48 and booster pumps, the above pressure balance can be created while maintaining the flow rate necessary for cleaning and the temperature necessary for sterilization.

[0076] For convenience, the thermometer, concentration meter, pressure gauge, and flow meter are omitted from the diagrams. These thermometers, concentration meters, pressure gauges, and flow meters are installed at various locations and may be used for control by the control unit 60.

[0077] Next, the internal structure of each heat exchanger 51a to 51c will be described with reference to Figure 3. Figure 3 is a cross-sectional view of each heat exchanger 51a to 51c. Note that each heat exchanger 51a to 51c may have the same structure.

[0078] As shown in Figure 3, each heat exchanger 51a to 51c has a shell 71, a pair of tube sheets 72a and 72b provided at both longitudinal ends of the shell 71, and a plurality of tubes 73 extending into the shell 71.

[0079] The shell 71 is cylindrical or tubular in shape. Inside the shell 71, a space S is formed around the multiple tubes 73 through which a fluid, such as the contents, passes. The body of the shell 71 is provided with a body-side inlet 54c and a body-side outlet 54d. The body-side inlet 54c is at the longitudinal end of the shell 71 and is located near the tube-side outlet 54b. The body-side outlet 54d is at the longitudinal end of the shell 71 and is located near the tube-side inlet 54a.

[0080] A pair of tube sheets 72a and 72b are each disc-shaped and close both longitudinal ends of the shell 71. Openings are formed in each of the tube sheets 72a and 72b, and the ends of the tubes 73 are fixed to each opening. A tube-side inlet 54a is formed on one tube sheet 72a side, and a tube-side outlet 54b is formed on the other tube sheet 72b side.

[0081] Multiple tubes 73 each extend from one tube sheet 72a to the other tube sheet 72b. The multiple tubes 73 are arranged radially apart from each other. Fluid such as contents flowing in from the tube-side inlet 54a passes through the multiple tubes 73 and flows out from the tube-side outlet 54b. On the other hand, fluid such as contents flowing in from the shell-side inlet 54c passes through the space S inside the shell 71 and flows out from the shell-side outlet 54d. Inside each heat exchanger 51a to 51c, the space S and the tubes 73 do not communicate with each other. Heat exchange takes place inside each heat exchanger 51a to 51c between the fluid passing through the tubes 73 and the fluid passing through the space S. As a result, the temperature of the fluid passing through the tubes 73 rises (falls) and the temperature of the fluid passing through the space S falls (rises).

[0082] (Content filling method) Next, a method for filling contents using the contents filling system 10 described above will be explained. In the following, the method for filling contents under normal circumstances, that is, a method for filling contents into bottle 90 to produce product bottle 95, will be described.

[0083] First, the preform supply device 37 sequentially supplies multiple preforms 91 to the preform receiving section 34 of the preform transport section 31 via the preform supply conveyor 37a (preform supply process). At this time, the preforms 91 are sterilized by the preform sterilization device 34a by spraying hydrogen peroxide gas or mist onto them, and then dried with hot air.

[0084] Next, the preform 91 is sent to the preform heating section 35, where it is heated by the heater 35a to, for example, between 90°C and 130°C. Then, the preform 91 heated by the preform heating section 35 is sent to the preform transfer section 36. Finally, the preform 91 is sent from the preform transfer section 36 to the blow molding section 32.

[0085] Next, the preform 91 sent to the blow molding section 32 is blow-molded using a mold (not shown) to form a bottle 90 (bottle molding process). The blow-molded bottle 90 is then sent to the bottle transport section 33.

[0086] Next, in the container sterilization device 11, the bottle 90 is sterilized using an aqueous hydrogen peroxide solution, which is a disinfectant (container sterilization process). At this time, the disinfectant may be a gas or mist obtained by vaporizing the aqueous hydrogen peroxide solution above its boiling point. The gas or mist of the aqueous hydrogen peroxide solution adheres to the inner and outer surfaces of the bottle 90, sterilizing the inner and outer surfaces of the bottle 90.

[0087] Next, bottle 90 is sent to the air rinsing device 14. In the air rinsing device 14, sterile heated air or sterile room-temperature air is supplied to bottle 90 to activate the hydrogen peroxide and remove foreign matter and hydrogen peroxide from bottle 90 (air rinsing process). In the air rinsing process, if necessary, a low-concentration hydrogen peroxide condensation mist may be mixed with the sterile heated air or sterile room-temperature air. In this case, the hydrogen peroxide is gasified by the sterile air. Then, in the air rinsing process, the gasified hydrogen peroxide may be supplied to bottle 90.

[0088] Next, bottle 90 is transported to filling device 20.

[0089] During this time, the contents are prepared from the beverage raw materials in the contents mixing unit 41 (contents preparation process). These contents are sent to the first tank 42 via the contents supply system piping 45a and stored there. Subsequently, the contents are sent by the pump 46 to the contents sterilization device 40 via the contents supply system piping 45b and the fourth heat exchanger 66. In the contents sterilization device 40, the contents flow in from the first inlet 50a of the heat exchange unit 50, undergo heat exchange in each heat exchanger 51a to 51c, and after the temperature rises, flow out from the first outlet 50b. The contents that have flowed out from the first outlet 50b are further heated in the heating unit 52 and sent to the holding tube 53. The contents require a certain amount of time (residence time) or more to pass through the holding tube 53, during which time they maintain a temperature above a predetermined level. Subsequently, the contents flow in from the second inlet 50c of the heat exchange unit 50, undergo heat exchange in each heat exchanger 51a to 51c, and after a temperature drop, flow out from the second outlet 50d. In this way, sterilization of the contents is completed. When filling with contents, the first valve 64a and the fourth valve 64d are open, and the second valve 64b, the third valve 64c, and the fifth valve 64e are closed. Also, the first circulation pipe 63a, the second circulation pipe 63b, and the third circulation pipe 63c are not used.

[0090] The sterilized contents are sent to the temperature control unit 43 via the contents supply piping 45c. In the temperature control unit 43, the temperature of the contents is final-adjusted. Specifically, the temperature of the contents is lowered to the filling temperature of the filling device 20. The filling temperature may be, for example, 1°C to 40°C, preferably 5°C to 30°C. The contents from the temperature control unit 43 are sent to the second tank 44 and stored there.

[0091] In the filling device 20, the bottle 90 is rotated (revolved) while the contents are filled into the bottle 90 from its opening. In the filling device 20, the contents sent from the second tank 44 are filled into the sterilized bottle 90 at a filling temperature of 1°C to 40°C, preferably 5°C to 30°C.

[0092] Afterward, the bottles 90, which have been filled with their contents by the filling device 20, are transported to the capping device 16 by the transport wheels 12.

[0093] Meanwhile, the cap 92 is sterilized in advance by the cap sterilization device 18 (cap sterilization process). During this time, the cap 92 is first brought into the cap sterilization device 18 from outside the contents filling system 10. Subsequently, in the cap sterilization device 18, the cap 92 is sterilized on its inner and outer surfaces by being sprayed with hydrogen peroxide gas or mist, then dried with hot air, and sent to the cap mounting device 16.

[0094] Next, in the capping device 16, a sterilized cap 92 is attached to the mouth of the bottle 90 that has been transported from the filling device 20, thereby closing the bottle 90 and obtaining a product bottle 95 (capping process).

[0095] Subsequently, the product bottle 95 is transported from the capping device 16 to the product bottle discharge section 19 and discharged to the outside of the contents filling system 10 (bottle discharge process). Then, the product bottle 95 is transported to a packaging line (not shown) and packaged.

[0096] Furthermore, the production (conveying) speed of the bottles 90 in the contents filling system 10 is preferably 100 bpm or more and 1500 bpm or less. Here, bpm (bottles per minute) refers to the conveying speed of bottles 90 per minute.

[0097] (Washing and sterilization methods) Next, the operation of the contents filling system 10 when cleaning (CIP) and sterilization (SIP) processes are performed, for example, periodically or when switching between types of beverages, will be explained. The control of the cleaning process described below is performed by the control unit 60.

[0098] In the following, the processing fluid may be any of the following: rinse water, alkaline cleaning solution, acidic cleaning solution, heated steam, or hot water. The cleaning process (CIP process) includes rinse water, alkaline cleaning, and acidic cleaning. Of these, the rinse water process is a process of rinsing the flow path in the contents filling system 10 with rinse water. The alkaline cleaning process is a process of flowing an alkaline cleaning solution, for example, by adding an alkaline agent such as caustic soda to water, through the flow path in the contents filling system 10. The acidic cleaning process is a process of flowing an acidic cleaning solution, for example, by adding an acidic agent to water, through the flow path in the contents filling system 10. The sterilization process (SIP process) is a process of performing high-temperature sterilization by flowing heated steam or hot water through the flow path through which the contents will pass before the contents filling operation begins. In this embodiment, the sterilization process (SIP process) may be performed after the cleaning process (CIP process). Alternatively, a cleaning and sterilization treatment (CSIP treatment) may be performed, which combines cleaning and sterilization without requiring a separate sterilization treatment (SIP treatment).

[0099] (Forward flow treatment) First, let's explain the forward flow process. In the forward flow process, the processed fluid either passes through in the forward flow direction (the same direction as the flow direction when the contents are filled) or is circulated in the forward flow direction.

[0100] In this case, the first valve 64a and the fifth valve 64e are opened in advance, and the second valve 64b, the third valve 64c, and the fourth valve 64d are closed. In the forward flow treatment, the third circulation pipe 63c is used, and the first circulation pipe 63a and the second circulation pipe 63b are not used.

[0101] Next, the processed fluid is sent from the processed fluid input section 47 to the piping system formed by the contents supply system piping 45a to 45d and the third circulation piping 63c. As this processed fluid passes through or circulates, the piping system, the first tank 42, the contents sterilization device 40, and the temperature control section 43 are each purified.

[0102] As shown in Figure 4, for example, a processing fluid is sent to the first tank 42, and as this processing fluid passes through or circulates, the piping system, the first tank 42, the contents sterilization device 40, and the temperature control unit 43 are purified. In Figure 4, the flow path through which the processing fluid passes is indicated by a thick line.

[0103] During this time, the processing fluid is sent to the contents sterilization device 40 via the fourth heat exchanger 66 by a pump 46 located in the contents supply system piping 45b. The processing fluid exchanges heat with the high-temperature processing fluid flowing in from the sixth inlet 66c within the fourth heat exchanger 66, causing its temperature to rise. This processing fluid flows into the contents sterilization device 40 from the first inlet 50a of the heat exchange unit 50. The processing fluid flowing in from the first inlet 50a passes sequentially through the first heat exchanger 51a, the second heat exchanger 51b, and the third heat exchanger 51c. The processing fluid exchanges heat with the high-temperature processing fluid flowing in from the second inlet 50c within the first heat exchanger 51a, the second heat exchanger 51b, and the third heat exchanger 51c, causing its temperature to rise. The heated processing fluid flows out from the first outlet 50b.

[0104] The heated processing fluid flows through the circulation system piping 56 and is further heated in the heating section 52. This heated processing fluid then reaches the holding tube 53. The processing fluid requires a certain amount of time (residence time) or more to pass through the holding tube 53, during which time it maintains a temperature above a predetermined level. After that, the processing fluid flows from the circulation system piping 56 into the second inlet 50c of the heat exchange unit 50.

[0105] The processed fluid flowing in from the second inlet 50c passes sequentially through the third heat exchanger 51c, the second heat exchanger 51b, and the first heat exchanger 51a. The processed fluid exchanges heat with the low-temperature processed fluid flowing in from the first inlet 50a within the third heat exchanger 51c, the second heat exchanger 51b, and the first heat exchanger 51a, causing its temperature to decrease. The cooled processed fluid then flows out from the second outlet 50d.

[0106] The processed fluid that flows out from the second outlet 50d of the heat exchange unit 50 reaches the temperature control unit 43 via the contents supply system piping 45c. Next, the processed fluid reaches the third circulation piping 63c via the contents supply system piping 45d and the fifth branch section 62e in sequence. In the third circulation piping 63c, the processed fluid passes through the fourth heat exchanger 66. At this time, the processed fluid exchanges heat with the low-temperature processed fluid flowing in from the fifth inlet 66a within the fourth heat exchanger 66, and its temperature decreases.

[0107] When a rinse solution is used as the processing fluid (rinse treatment), the processing fluid is discharged to the outside from the third circulation pipe 63c. When an alkaline cleaning solution, an acidic cleaning solution, or hot water is used as the processing fluid (alkaline cleaning treatment, acidic cleaning treatment, SIP treatment), the processing fluid is circulated. Therefore, the processing fluid reaches the first tank 42 from the third circulation pipe 63c. After that, the processing fluid is sent again from the first tank 42 to the heat exchange unit 50 by the pump 46. In this way, the alkaline cleaning solution, acidic cleaning solution, or hot water circulates for a predetermined time through the piping system formed by the contents supply system pipes 45a to 45d and the third circulation pipe 63c, the first tank 42, the contents sterilization device 40, and the temperature control unit 43. After circulating for the predetermined time, the alkaline cleaning solution, acidic cleaning solution, or hot water is discharged to the outside.

[0108] If the processing fluid is an alkaline or acidic cleaning solution, the processing fluid is heated by the heat exchange unit 50. The heated processing fluid is supplied to the piping system, the first tank 42, the contents sterilization device 40, and the temperature control unit 43, respectively. When this circulation is performed for, for example, 5 to 60 minutes, the piping system, the first tank 42, the contents sterilization device 40, and the temperature control unit 43 are properly purified. At the same time, the piping system, the first tank 42, the contents sterilization device 40, and the temperature control unit 43 are sterilized, and SIP is performed simultaneously without the need for a separate SIP treatment (CSIP treatment). In this way, by cleaning the various components of the contents filling system 10 with CIP treatment and simultaneously performing sterilization treatment, the time required for SIP treatment can be shortened or SIP treatment itself can be eliminated. This shortens the product changeover time of the contents filling system 10 and improves production capacity. Furthermore, during CSIP processing, the processing fluid flowing through the first tank 42, pump 46, and fourth heat exchanger 66 is at a lower temperature than the processing fluid flowing through the contents sterilization device 40 and temperature control unit 43. For this reason, the first tank 42, pump 46, and fourth heat exchanger 66 may be excluded from the SIP processing.

[0109] (Backflow treatment) Next, we will explain the backflow treatment. In backflow treatment, the treatment fluid either passes in the reverse direction (opposite to the flow direction during content filling) or is circulated in the reverse direction.

[0110] In this case, the second valve 64b and the third valve 64c are opened in advance, and the first valve 64a, the fourth valve 64d, and the fifth valve 64e are closed. For backflow treatment, the first circulation pipe 63a, the second circulation pipe 63b, and the third circulation pipe 63c are used.

[0111] At this time, as shown in Figure 5, the processed fluid is sent from the processed fluid input section 47 to the piping system formed by the contents supply pipes 45a to 45d and the circulation pipes 63a to 63c. In the backflow treatment, the processed fluid circulates in the opposite direction to the forward flow treatment. As a result, the piping system formed by the contents supply pipes 45a to 45d and the circulation pipes 63a to 63c, the temperature control section 43, the contents sterilization device 40, and the first tank 42 are purified. Note that in Figure 5, the flow path through which the processed fluid passes is shown by a thick line.

[0112] During this time, the processing fluid is sent to the first circulation pipe 63a via the first branch 62a by a pump 46 located in the contents supply pipe 45b. Subsequently, the processing fluid flows into the temperature control unit 43 sequentially through the third branch 62c, the third circulation pipe 63c, the fifth branch 62e, and the contents supply pipe 45d. During this time, the processing fluid passes through the fourth heat exchanger 66 located in the third circulation pipe 63c. The processing fluid exchanges heat with the high-temperature processing fluid flowing in from the fifth outlet 66b within the fourth heat exchanger 66, causing its temperature to rise.

[0113] Next, the processing fluid flows into the heat exchange unit 50 from the second outlet 50d via the contents supply system piping 45c. The processing fluid flowing in from the second outlet 50d passes sequentially through the first heat exchanger 51a, the second heat exchanger 51b, and the third heat exchanger 51c. The processing fluid exchanges heat with the high-temperature processing fluid flowing in from the first outlet 50b within the first heat exchanger 51a, the second heat exchanger 51b, and the third heat exchanger 51c, causing its temperature to rise. The processing fluid, now at a higher temperature, flows out from the second inlet 50c.

[0114] The heated processing fluid reaches the holding tube 53 via the circulation piping 56. The processing fluid requires a certain amount of time (residence time) or more to pass through the holding tube 53, during which time it maintains a temperature above a predetermined level. Subsequently, the processing fluid is further heated in the heating section 52. After that, the processing fluid flows from the circulation piping 56 to the first outlet 50b of the heat exchange unit 50.

[0115] The processed fluid flowing in from the first outlet 50b passes sequentially through the third heat exchanger 51c, the second heat exchanger 51b, and the first heat exchanger 51a. The processed fluid exchanges heat with the low-temperature processed fluid flowing in from the second outlet 50d within the third heat exchanger 51c, the second heat exchanger 51b, and the first heat exchanger 51a, causing its temperature to decrease. The cooled processed fluid then flows out from the first inlet 50a.

[0116] The processed fluid flowing out from the first inlet 50a of the heat exchange unit 50 reaches the second circulation pipe 63b via the contents supply system piping 45b and the second branch section 62b in sequence. During this time, the processed fluid passes through the fourth heat exchanger 66 located in the contents supply system piping 45b. The processed fluid exchanges heat with the low-temperature processed fluid flowing in from the sixth outlet 66d within the fourth heat exchanger 66, causing its temperature to decrease.

[0117] When a rinse solution is used as the processing fluid (rinse treatment), the processing fluid is discharged to the outside from the second circulation pipe 63b. When an alkaline cleaning solution, an acidic cleaning solution, or hot water is used as the processing fluid (alkaline cleaning treatment, acidic cleaning treatment, SIP treatment), the processing fluid is circulated. Therefore, the processing fluid reaches the first tank 42 sequentially via the second circulation pipe 63b and the fourth branch section 62d. After that, the processing fluid is sent again from the first tank 42 to the temperature control section 43 by the pump 46. In this way, the alkaline cleaning solution, acidic cleaning solution, or hot water circulates and cleans the piping system formed by the contents supply system pipes 45a to 45d and the circulation pipes 63a to 63c, the temperature control section 43, the contents sterilization device 40, and the first tank 42 for a predetermined time. After circulating for the predetermined time, the alkaline cleaning solution, acidic cleaning solution, or hot water is discharged to the outside.

[0118] In the backflow treatment process, the piping system, the first tank 42, the contents sterilization device 40, and the temperature control unit 43 may each be properly purified and sterilized (CSIP treatment).

[0119] In the above procedure, a reverse flow treatment is performed after a forward flow treatment. However, it is not limited to this procedure; a reverse flow treatment may be performed first, followed by a forward flow treatment. This allows for a reduction in cleaning time depending on the nature of the fouling adhering to the heat exchangers 51a to 51c, contributing to energy savings. Alternatively, a reverse flow treatment may be performed after a forward flow treatment, followed by another forward flow treatment. This makes it possible to effectively clean poorly cleaned areas within the heat exchangers 51a to 51c, resulting in reduced cleaning time, reduced steam consumption, reduced carbon dioxide emissions, reduced cleaning solution, water conservation, and reduced wastewater.

[0120] Incidentally, when performing the forward flow treatment described above, it was found that there are areas inside the heat exchangers 51a to 51c where the treatment fluid does not sufficiently reach, resulting in insufficient cleaning. In particular, as shown in Figure 3, the treatment fluid that flows into the space S from the shell-side inlet 54c flows toward the shell-side outlet 54d and toward one of the tube sheets 72a (solid arrow F1 in Figure 3). Also, generally, in heat exchangers 51a to 51c, the shell-side inlet 54c is located at a position slightly separated from the other tube sheet 72b. Therefore, the treatment fluid does not sufficiently enter the area inside the shell 71 between the other tube sheet 72b and the shell-side inlet 54c (the area indicated by the symbol R in Figure 3), which can lead to uneven cleaning and insufficient cleaning of this area R. However, the area on the side of one of the tube sheets 72a is thoroughly cleaned because the treatment fluid flows into it.

[0121] In contrast, according to this embodiment, as described above, in addition to forward flow treatment, backflow treatment is performed. In backflow treatment, the treatment fluid is flowed in the opposite direction to the forward flow treatment. In this case, as shown in Figure 3, the treatment fluid that flows into the space S from the shell-side outlet 54d flows toward the shell-side inlet 54c and the other tube sheet 72b (dashed arrow F2 in Figure 3). As a result, the treatment fluid flows sufficiently into the region R inside the shell 71 between the other tube sheet 72b and the shell-side inlet 54c, and this region R can be thoroughly cleaned.

[0122] In addition, the contents mixing unit 41, the filling device 20, and the second tank 44 are also separately cleaned and sterilized using an alkaline cleaning solution and an acidic cleaning solution.

[0123] After the washing and sterilization processes are completed, the contents are stored in the first tank 42, and then the contents pass through the contents sterilization device 40 to the filling device 20, initiating a manufacturing process in which the contents are filled into the bottles 90.

[0124] (Processing patterns for cleaning and sterilization) Next, we will explain examples of the treatment patterns for the CIP (cleaning), SIP (sterilization), and CSIP (cleaning and sterilization) treatments described above. In CIP, SIP, and CSIP treatments, some or all of the following are performed: rinsing with a water rinse solution, alkaline cleaning with an alkaline cleaning solution, acidic cleaning with an acidic cleaning solution, or sterilization with hot water.

[0125] As shown in Figures 6(a)-(e), for example, after the content filling process (manufacturing process), the processes may be carried out in the order of CIP treatment and SIP treatment, and then the next content filling process (manufacturing process) may be carried out. Note that the order of alkaline cleaning treatment and acidic cleaning treatment shown in Figures 6(a)-(e) is just an example, and it may be changed as appropriate according to the cleaning properties of the target dirt.

[0126] (Pattern 1) As shown in Figure 6(a), in the CIP treatment, (1) water rinsing, (2) alkaline cleaning, (3) water rinsing, (4) acidic cleaning, (5) water rinsing may be performed, followed by (6) SIP treatment with hot water. Of these, (1) water rinsing, (2) alkaline cleaning, (3) water rinsing, and (6) SIP treatment correspond to forward flow treatment. (4) acidic cleaning and (5) water rinsing correspond to backflow treatment.

[0127] (Pattern 2) As shown in Figure 6(b), in the CIP treatment, (1) water rinsing, (2) alkaline cleaning, (3) water rinsing, (4) acidic cleaning, (5) water rinsing may be performed, followed by (6) SIP treatment with hot water. Of these, (1) water rinsing, (4) acidic cleaning, (5) water rinsing, and (6) SIP treatment correspond to forward flow treatment. (2) alkaline cleaning and (3) water rinsing correspond to backflow treatment.

[0128] (Pattern 3) As shown in Figure 6(c), in the CIP treatment, (1) water rinsing, (2) acidic cleaning, (3) water rinsing, (4) alkaline cleaning, and (5) water rinsing may be performed, followed by (6) a SIP treatment with hot water. Of these, (1) water rinsing, (3) water rinsing, (5) water rinsing, and (6) SIP treatment correspond to forward flow treatment. (2) acidic cleaning and (4) alkaline cleaning correspond to backflow treatment.

[0129] (Pattern 4) As shown in Figure 6(d), in the CIP treatment, (1) water rinsing, (2) first acidic washing, (3) second acidic washing, (4) water rinsing, (5) first alkaline washing, (6) second alkaline washing may be performed, followed by (7) SIP treatment with hot water. Of these, (1) water rinsing, (2) first acidic washing, (5) first alkaline washing, and (7) SIP treatment correspond to forward flow treatment. (3) second acidic washing, (4) water rinsing, and (6) second alkaline washing correspond to backflow treatment.

[0130] (Pattern 5) As shown in Figure 6(e), in the CIP treatment, (1) water rinsing, (2) first acidic washing, (3) second acidic washing, (4) first alkaline washing, (5) second alkaline washing may be performed, followed by (6) SIP treatment with hot water. Of these, (1) water rinsing, (2) first acidic washing, (4) first alkaline washing, and (6) SIP treatment correspond to forward flow treatment. (3) second acidic washing and (5) second alkaline washing correspond to backflow treatment.

[0131] As shown in Figures 7(a)-(c), for example, after the content filling process (manufacturing process), the processes may be carried out in the order of CIP treatment and CSIP treatment, and then the next content filling process (manufacturing process) may be carried out. Note that the order of acidic cleaning treatment and alkaline cleaning treatment shown in Figures 7(a)-(c) is just an example, and it may be changed as appropriate according to the cleaning properties of the target dirt.

[0132] (Pattern 6) As shown in Figure 7(a), in the CIP treatment, (1) water rinsing, (2) acidic cleaning, and (3) water rinsing may be performed, and then in the CSIP treatment, (4) alkaline cleaning and (5) water rinsing may be performed. Of these, (1) water rinsing, (4) alkaline cleaning, and (5) water rinsing correspond to forward flow treatment. (2) acidic cleaning and (3) water rinsing correspond to backflow treatment.

[0133] (Pattern 7) As shown in Figure 7(b), in the CIP treatment, (1) water rinsing, (2) first acidic cleaning, (3) second acidic cleaning, and (4) first alkaline cleaning may be performed, and then in the CSIP treatment, (5) second alkaline cleaning and (6) water rinsing may be performed. Of these, (1) water rinsing, (2) first acidic cleaning, (5) second alkaline cleaning, and (6) water rinsing correspond to forward flow treatment. (3) second acidic cleaning and (4) first alkaline cleaning correspond to backflow treatment.

[0134] (Pattern 8) As shown in Figure 7(c), in the CIP treatment, (1) water rinsing, (2) first acidic washing, (3) second acidic washing, (4) first alkaline washing, and (5) second alkaline washing may be performed, and then in the CSIP treatment, (6) water rinsing may be performed. Of these, (1) water rinsing, (2) first acidic washing, (5) second alkaline washing, and (6) water rinsing correspond to forward flow treatment. (3) second acidic washing and (4) first alkaline washing correspond to backflow treatment.

[0135] As illustrated in patterns 1 to 8 above, the final step of the washing and sterilization methods is preferably a forward flow treatment step. This allows the process to transition to the production state while maintaining a sterile condition from the heating section 52 to the holding tube 53, and while the fluid pressure of the processing fluid passing through the heat exchangers 51a to 51c after the holding tube 53 remains higher than the fluid pressure of the processing fluid passing before the holding tube 53 (without reversing the safety back pressure).

[0136] As illustrated in patterns 5, 7, and 8 above, a rinsing step is not required between the acidic and alkaline cleaning treatments. In this case, the alkaline cleaning treatment may be performed immediately after the acidic cleaning treatment, or vice versa. This shortens the cleaning time, saves water, and contributes to energy conservation. In some cases, a cleaning effect can be obtained through a pH attack (a localized and rapid pH change). The pH of the acidic cleaning solution is, for example, between 1 and 3, and the pH of the alkaline cleaning solution is, for example, between 11 and 13. That is, the pH range for the pH attack is, for example, between 8 and 12. The pH range for the pH attack refers to the difference between the pH of the alkaline cleaning solution and the pH of the acidic cleaning solution.

[0137] The table below shows the temperature of the processing fluid flowing through each part of the contents filling system 10 during the CIP (cleaning), SIP (sterilization), and CSIP (cleaning and sterilization) processes described above. Specifically, it shows the temperature in the first tank 42, contents supply system piping 45b, first circulation piping 63a, first inlet 50a, first outlet 50b, second inlet 50c, second outlet 50d, contents supply system piping 45c, contents supply system piping 45d, sixth inlet 66c, sixth outlet 66d, and second circulation piping 63b of the contents filling system 10.

[0138] [Table 1]

[0139] (Method for heating the processing fluid) Next, we will explain the method for heating the treatment fluid during the cleaning and sterilization treatment (CSIP treatment) described above.

[0140] During the cleaning and sterilization process (CSIP process), the processing fluid is sent to the contents sterilization device 40 and heated in the heating section 52 of the contents sterilization device 40. This heated processing fluid passes through the holding tube 53 and is supplied to the heat exchange unit 50. The processing fluid requires a certain amount of time (residence time) or more to pass through the holding tube 53, during which time it maintains a temperature above a predetermined level.

[0141] The degree of sterilization of the processing fluid passing through the holding tube 53 may be controlled by the F value. For example, the temperature at the outlet side of the holding tube 53 may be measured while the processing fluid is flowing through the holding tube 53. In this case, the temperature information at the outlet side is sent to the control unit 60 at regular time intervals. The control unit 60 calculates the F value at that time based on this temperature information. Here, the F value is the heating time required to kill all bacteria when they are heated for a certain period of time, and is expressed as the lethal time of bacteria at a reference temperature, and is calculated by the following formula.

[0142]

number

[0143] In the above formula, T is the temperature (°C) measured at the outlet side of the holding tube 53, 10^{(T-Tr) / Z} is the lethality at the sterilization temperature T, Tr is the reference temperature (°C), and Z is the Z value (°C). Also, t1 (minutes) is the (minimum) residence time required for the processing fluid to pass through the holding tube 53, and is predetermined as a specific value. Alternatively, t1 (minutes) may be the value obtained by measuring in real time the time the processing fluid actually passes through the holding tube 53 based on the flow rate of the processing fluid in the holding tube 53 and the volume of the holding tube 53. The F value during washing and sterilization should be set to be equal to or greater than the sterilization conditions for the next type of product to be manufactured, or to F03 or higher (Z=10°C).

[0144] The control unit 60 monitors the F value calculated based on the temperature at the outlet, and continues the cleaning process if this value remains above a predetermined value. Specifically, the control unit 60 accumulates the value of 10^{(T-Tr) / Z} based on temperature information sent at regular time intervals. The accumulated value from the current time to the immediately preceding t1 (minutes) is then taken as the F value at that time. If this F value remains above a predetermined value, the control unit 60 assumes that the sterility of the processing fluid passing through the holding tube 53 is ensured and continues the cleaning process. On the other hand, if the F value falls below a predetermined value, the control unit 60 may determine that some kind of trouble has occurred and the sterility of the processing fluid can no longer be ensured, and may stop the cleaning process.

[0145] Furthermore, the sterilization method is not limited to the method of calculating the F value and sterilizing based on that value, as described above. For example, a sterilization method using temperature and time, as has been known conventionally, may also be employed.

[0146] As described above, according to this embodiment, the control unit 60 performs forward flow processing and reverse flow processing. Forward flow processing involves passing the processing fluid through the first inlet 50a, the first outlet 50b, the heating unit 52, the second inlet 50c, and the second outlet 50d in that order. Reverse flow processing involves passing the processing fluid through the second outlet 50d, the second inlet 50c, the heating unit 52, the first outlet 50b, and the first inlet 50a in that order. This allows areas inside the heat exchangers 51a to 51c that are difficult to clean with forward flow processing to be cleaned with reverse flow processing. For example, reverse flow processing can clean the region R (see Figure 3) between the other tube sheet 72b and the shell side inlet 54c of the heat exchangers 51a to 51c. Conversely, areas inside the heat exchangers 51a to 51c that are difficult to clean with reverse flow processing can be cleaned with forward flow processing. This improves the cleanability during the cleaning process of the contents filling system 10.

[0147] As an alternative, in the heat exchangers 51a to 51c shown in Figure 3, the processing fluid flowing from the pipe-side inlet 54a to the pipe-side outlet 54b and the flow processing fluid flowing from the shell-side inlet 54c to the shell-side outlet 54d may be supplied in opposite directions. This supply direction may be appropriately changed according to the degree of fouling inside the heat exchangers 51a to 51c.

[0148] Furthermore, as another variation, the backflow treatment may be performed only on the heat exchangers 51a to 51c that are heated to 60°C or higher, the temperature at which proteins denature. In this case, bypass channels (not shown) may be provided in the heat exchangers 51a to 51c. This allows, for example, the first heat exchanger 51a to perform only forward flow treatment, while the second heat exchanger 51b and the third heat exchanger 51c to perform both forward flow treatment and backflow treatment.

[0149] Furthermore, according to this embodiment, the first outlet 50b and the second inlet 50c of the heat exchange unit 50 are connected via a heating section 52. In this case, there is no need to prepare another medium for heating or cooling the fluid passing through the heat exchange unit 50. This reduces the installation area of ​​the heat exchange unit 50. It also increases the heat recovery rate of the heat exchange unit 50, leading to energy savings. Moreover, it reduces the maintenance costs of the heat exchange unit 50.

[0150] Furthermore, according to this embodiment, the contents sterilization device 40 has a holding tube 53. By having the contents or a fluid such as a processing fluid remain in the holding tube 53 for a certain residence time (holding time) and while maintaining a sterilization temperature, the sterility of the fluid can be ensured.

[0151] In this embodiment, the pressure of the processed fluid in the flow path (space S) of the heat exchangers 51a to 51c after the holding tube 53 may be maintained higher than the pressure of the processed fluid in the other flow path (tube 73) that is being heat exchanged. In particular, it is preferable to satisfy the above relationship with respect to the pressure of the processed fluid during the forward flow treatment immediately before the contents filling process (manufacturing). This ensures the sterility of the processed fluid, especially during the contents filling process.

[0152] Furthermore, according to this embodiment, the contents sterilization device 40 is further equipped with a temperature adjustment unit 43 that adjusts the temperature of the sterilized contents to the filling temperature. This allows for appropriate control of the filling temperature of the contents by the filling device 20.

[0153] Furthermore, according to this embodiment, the processing fluid is heated by the heating unit 52 during both forward flow and backflow processing. In this case, the flow path through which the contents pass can be cleaned by CIP processing and sterilized at the same time. This shortens the time required for SIP processing or eliminates SIP processing altogether. As a result, the product changeover time of the contents filling system 10 can be shortened and production capacity can be improved.

[0154] Furthermore, the contents filling system 10 is further equipped with a third circulation pipe 63c that connects the position between the contents sterilization device 40 and the filling device 20 to the first tank 42. This allows the processing fluid to be circulated between the first tank 42 and the contents sterilization device 40 during forward flow processing and backflow processing.

[0155] In the above description, a content filling system 10 using an aseptic filling method was used as an example, but it is not limited to this. The content filling system may also be a content filling system that uses a hot filling method in which the contents are filled at a high temperature of 55°C to 95°C. It may also be a content filling system that fills contents that undergo SIP (inactivation of microorganisms) after CIP (clean-in-place) treatment, such as chilled beverages or alcoholic beverages.

[0156] The multiple components disclosed in the above embodiments and variations can be combined as needed. Alternatively, some components may be removed from all the components shown in the above embodiments and variations. [Explanation of Symbols]

[0157] 10 Contents filling system 20 Filling equipment 40 Contents sterilizer 41 Contents mixing section 42 Tank No. 1 43 Temperature adjustment section 44 Tank No. 2 45a~45d Contents supply system piping 50 Heat exchange unit 50a First Inlet 50b 1st outlet 50c 2nd inlet 50d 2nd outlet 51a~51c Heat exchanger 52 Heating section 53 Holding Tube 60 Control Unit 90 bottles

Claims

1. A content filling system for filling with contents, A sterilization device for sterilizing the contents, A filling device for filling the contents that have been sterilized in the contents sterilization device, The system comprises a control unit for controlling the content filling system, The contents sterilization device comprises a heat exchange unit including at least one heat exchanger and a heating unit connected to the heat exchange unit. The heat exchange unit has a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The first outlet and the second inlet are connected via the heating section. The control unit, A forward flow process is performed by passing the processing fluid through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order. A backflow process is performed in which the processing fluid is passed through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order. The heat exchanger has a pipe-side inlet, a pipe-side outlet communicating with the pipe-side inlet, a shell-side inlet, and a shell-side outlet communicating with the shell-side inlet. A content filling system that allows the direction of fluid delivery between the processing fluid flowing from the pipe-side inlet to the pipe-side outlet and the processing fluid flowing from the shell-side inlet to the shell-side outlet to be changed.

2. The contents filling system according to claim 1, wherein the processing fluid flowing from the pipe-side inlet to the pipe-side outlet and the processing fluid flowing from the shell-side inlet to the shell-side outlet are supplied in opposite directions to each other.

3. A content filling system for filling with contents, A sterilization device for sterilizing the contents, A filling device for filling the contents that have been sterilized in the contents sterilization device, The system comprises a control unit for controlling the content filling system, The contents sterilization apparatus has a heat exchange unit including a plurality of heat exchangers and a heating unit connected to the heat exchange unit, The heat exchange unit has a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The first outlet and the second inlet are connected via the heating section. The control unit, A forward flow process is performed by passing the processing fluid through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order. A backflow process is performed in which the processing fluid is passed through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order. The contents filling system wherein the backflow treatment is performed only on some of the heat exchangers among the plurality of heat exchangers.

4. The contents filling system according to claim 3, wherein at least one heat exchanger performs only the forward flow treatment, and the other heat exchangers perform both the forward flow treatment and the reverse flow treatment.

5. The contents filling system according to claim 3, wherein the backflow treatment is performed only on the heat exchanger among the plurality of heat exchangers that is heated to 60°C or higher.

6. A content filling system for filling with contents, A sterilization device for sterilizing the contents, A filling device for filling the contents that have been sterilized in the contents sterilization device, A first pump that supplies the processing fluid to the contents sterilization device, The system comprises a control unit for controlling the content filling system, The contents sterilization apparatus comprises a heat exchange unit including at least one heat exchanger, a heating unit connected to the heat exchange unit, and a second pump that controls the liquid supply pressure of the processing fluid. The heat exchange unit has a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The first outlet and the second inlet are connected via the heating section. The control unit, A forward flow process is performed by passing the processing fluid through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order. A contents filling system that performs a backflow treatment in which the processing fluid is passed through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order.

7. The contents filling system according to claim 6, wherein the contents sterilization device has a holding tube, and the second pump is located between the first pump and the holding tube.

8. The contents filling system according to claim 6, wherein the contents sterilization device has a holding tube, and the second pump is located between the heating unit and the heat exchanger.

9. The contents filling system according to claim 6, wherein the heat exchange unit has a plurality of heat exchangers, and the second pump is located between the plurality of heat exchangers.

10. The contents filling system according to any one of claims 1 to 9, further comprising a second tank for storing the contents, wherein the second tank is located in the upper part of the filling device.

11. A method for cleaning or sterilizing a content filling system that is filled with contents, The contents filling system comprises a contents sterilization device for sterilizing the contents, and a filling device for filling the contents that have been sterilized by the contents sterilization device. The contents sterilization device comprises a heat exchange unit including at least one heat exchanger, and a heating unit connected to the heat exchange unit, the heat exchange unit having a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The aforementioned processing method is: A forward flow treatment step in which the treatment fluid is passed through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order, The system includes a backflow treatment step in which the processing fluid is passed through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order. The heat exchanger has a pipe-side inlet, a pipe-side outlet communicating with the pipe-side inlet, a shell-side inlet, and a shell-side outlet communicating with the shell-side inlet. A processing method that allows the direction of fluid delivery between the processing fluid flowing from the pipe-side inlet to the pipe-side outlet and the processing fluid flowing from the shell-side inlet to the shell-side outlet to be changed.

12. A method for cleaning or sterilizing a content filling system that is filled with contents, The contents filling system comprises a contents sterilization device for sterilizing the contents, and a filling device for filling the contents that have been sterilized by the contents sterilization device. The contents sterilization device comprises a heat exchange unit including a plurality of heat exchangers and a heating unit connected to the heat exchange unit, the heat exchange unit having a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The aforementioned processing method is: A forward flow treatment step in which the treatment fluid is passed through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order, The system includes a backflow treatment step in which the processing fluid is passed through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order. The backflow treatment step is performed on only some of the heat exchangers among the plurality of heat exchangers.

13. A method for cleaning or sterilizing a content filling system that is filled with contents, The contents filling system comprises a contents sterilization device for sterilizing the contents, a filling device for filling the contents sterilized in the contents sterilization device, and a first pump for supplying a processing fluid to the contents sterilization device. The contents sterilization apparatus comprises a heat exchange unit including at least one heat exchanger, a heating unit connected to the heat exchange unit, and a second pump for controlling the liquid supply pressure of the processing fluid, wherein the heat exchange unit has a first inlet, a first outlet communicating with the first inlet, a second inlet, and a second outlet communicating with the second inlet. The aforementioned processing method is: A forward flow treatment step in which the treatment fluid is passed through the first inlet, the first outlet, the heating section, the second inlet, and the second outlet in that order, A processing method comprising a backflow processing step of passing the processing fluid through the second outlet, the second inlet, the heating section, the first outlet, and the first inlet in that order.

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