JP4573321B2 - Clean booth sterilization structure of aseptic filling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the aseptic filling system for cans, the can lid winding machine is accommodated by reliably sterilizing the winding work area of the can lid winding machine covered with the clean booth with superheated steam (super steam). The present invention relates to a clean booth sterilization structure of an aseptic filling system that maintains the inside of a clean booth in a substantially sterile state.
[0002]
[Prior art]
In the production of canned beverages, sterilized beverages that have been sterilized in a short time at high temperatures and rapidly cooled to reduce the heat history and preserve the beverage's original taste, fragrance, and color as much as possible within an almost aseptic atmosphere Various so-called aseptic filling systems in which a sterilized empty can is filled and sealed with a sterilized can lid have been conventionally studied. In such an aseptic filling system, since there is no process of heat sterilization after canning, it is necessary to ensure sterilization in the filling / sealing (clamping) process, and therefore the air cleanliness Of the space in a clean room, the beverage filling area and the can lid winding area are further covered with a clean booth, and the clean booth is maintained at a higher class (substantially aseptic) air cleanliness than the clean room. This has been done conventionally.
[0003]
And for the can lid clamping machine (seamer) installed in the clean booth, the surface of the can lid clamping machine should be sterilized and washed with chemicals, steam, hot water, etc. before and after its operation. For example, in Japanese Patent Application Laid-Open No. 10-220700, prior to the start of tightening, a portion through which a seamer can and lid pass or a portion where dirt easily accumulates is mainly concentrated with hot water. It is disclosed that sterilization and sterilization are performed by washing, and the scattered internal solution and grease are always washed away.
[0004]
In addition, in Japanese Patent Application Laid-Open No. 2000-219216 filed by the present applicant, a chemical solution, hot water, hot water, etc. are applied to the clean booth inner wall and the surface of the can lid clamping machine before and after the start of daily production. The cleaning liquid is sequentially sprayed and cleaned and sterilized, while the steam heated to 350 ° C by the super steam device is sprayed into the clean booth through the super steam pipe, so that the inner surface of the clean booth and the surface of the can lid winding machine It is disclosed that initial sterilization is performed by maintaining the state for about 10 minutes after the temperature reaches 150 ° C., and such sterilization is performed in a timely manner thereafter.
[0005]
[Problems to be solved by the invention]
By the way, according to the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 10-220700, sterilization and washing of the can lid winding machine installed in the clean booth, the content liquid and grease scattered and adhered Is cleaned with hot water before starting tightening, but with a seaming head that rotates within the tightening work area, multiple tightening tools such as multiple seaming rolls and chucks that rotate at high speed Therefore, when the lubricating oil leaks from the seal portion due to excessive supply of the lubricating oil and enters the complicated portion of the seaming head, it cannot be easily washed away with the cleaning liquid.
[0006]
In addition, the lubricating oil such as oil and grease supplied to the can lid winding machine uses a lubricating oil that has been proven to be low in bacteria and has no danger to food, and is heated by steam or the like. If it is used in a sterilized state, but remains in a state where the lubricant remains attached and is not washed away, it will come into contact with the outside air during routine maintenance, and microorganisms (spores) present in the oil of the lubricant will be present. ) Among heat-resistant bacteria that are difficult to be killed by a washing solution such as hot water, such as Bacillus subtilis, Bacillus stearrothermophilus, Clostridium sporogenes ( Clostridium sporogenes), etc., and in the worst case, the contaminated lubrication adhered to the can lid winder during high speed sealing It is a chance falls mixed into the can may become a major Madai quality.
[0007]
On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 2000-219216, steam heated to 350 ° C. is sprayed into a clean booth, and the winding region portion of the can lid winding machine is set to 150 ° C. There are places where cleaning and sterilization with chemicals and hot water becomes insufficient by performing sterilization with superheated steam (super steam) in a regular cycle so that the state is maintained for about 10 minutes after reaching the temperature. Even so, the above-mentioned problem can be avoided because the portion is surely sterilized by high-temperature heating with superheated steam.
[0008]
However, in the clean booth that accommodates the can lid winding machine, in order to maintain the interior at a high level of air cleanliness, a fan / filter unit comprising a blower fan and a HEPA filter is provided on the upper side.・ Sterile air is supplied from the filter unit into the clean booth, so spraying superheated steam into the clean booth for sterilization as described above results in the fan and filter unit being affected by the high-temperature superheated steam. As a result, the filter may be damaged or the electrical components may be corroded, resulting in a problem of shortening the life of the fan / filter unit.
[0009]
An object of the present invention is to eliminate the above-described problems. Specifically, in a canned aseptic filling system, the winding work area by the can lid winding machine in the clean booth is surely sterilized. In addition, it is an object to prevent the life of the fan filter unit attached to the clean booth from being shortened.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a clean booth for covering at least a tightening work area of a can lid tightening machine used in an aseptic filling system with a substantially aseptic atmosphere, A clean booth equipped with a fan and filter unit for supplying aseptic air into the clean booth. A clean steam booth is used to spray superheated steam on the winding area of the can lid winding machine. Piping inside Shi , If the fan / filter unit and the clean booth are connected with shutter means to open and close the space between the two In both cases, when superheated steam is sprayed from the super steam pipe and the fan / filter unit and clean booth are shut off by shutter means, the fan drive motor of the fan / filter unit is driven at a slow speed by inverter control. By rotating, the fan / filter unit is configured to have a positive pressure than the clean booth. It is characterized by this.
[0011]
According to the clean booth sterilization structure of the aseptic filling system as described above, it is possible to surely sterilize the winding work area by the can lid winding machine in the clean booth by spraying superheated steam. Can be maintained in a substantially sterile state, and at the time of sterilization with superheated steam, the connection part of the fan / filter unit and the clean booth is blocked by the shutter means, Since the inside of the fan / filter unit is more positive than the inside of the clean booth, it is possible to effectively prevent the superheated steam from entering the fan / filter unit even if the airtightness due to the shutter means is not perfect. As a result, It is possible to prevent the life of the fan / filter unit from being shortened due to the spraying of the superheated steam without affecting the filter and electrical components in the fan / filter unit by the superheated steam.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a clean booth sterilization structure of an aseptic filling system of the present invention will be described in detail based on the drawings. 1 shows the appearance of the clean booth according to an embodiment of the present invention, and FIG. 2 shows the piping state of the sterilization pipe (sanitary pipe and super steam pipe) in the clean booth. FIG. 4 shows a piping state of a super steam pipe with respect to a can lid winding machine in a clean booth, and FIG. 5 schematically shows an entire aseptic filling area in a beverage canning production line by an aseptic filling system. Shows the supply path of superheated steam to the super steam pipe in the clean booth.
[0013]
In the canned beverage production line using an aseptic filling system, although not shown, while transporting unprocessed empty cans continuously supplied by an empty can supply conveyor, first, in the chemical spraying device on the outer surface of the can, After spraying the chemical solution for sterilization treatment (aqueous solution of 5% by weight of hydrogen peroxide) on the outer peripheral surface and the outer surface of the can bottom, through the chemical solution spraying device on the inner surface of the can and further on the inner surface of the empty can After spraying 5 wt% aqueous solution of hydrogen oxide), the mixture is fed into a heat sterilization treatment oven.
[0014]
In the heat sterilization treatment oven, while transporting empty cans sprayed with chemicals on the inner and outer surfaces, they are heated with hot air (about 250 ° C) in a heating furnace to decompose and remove hydrogen peroxide from the attached chemicals. This completes the sterilization of the empty can. Then, while transporting the sterilized empty can carried out from the heat sterilization treatment oven, the surrounding air is cleaned by a clean air replacement device in a transport tunnel having a substantially aseptic atmosphere (air cleanliness is class 100). By spraying aseptic water with a sterilized empty can cooling device, the heated empty can is cooled to near the filling temperature of the contents.
[0015]
The sterilized empty can thus cooled to near the filling temperature of the contents is passed through a transfer tunnel having a substantially aseptic atmosphere (air cleanliness is class 100), and is cleaned in a substantially aseptic atmosphere (air cleanliness is class 100). Beverage is supplied to the beverage filling machine (filler) installed in the booth, while the sterilized beverage which has been sterilized by high temperature and short time in the beverage sterilization apparatus and then cooled to the filling temperature is supplied through the pre-sterilized supply pipe The beverage is supplied to the filling machine, and the beverage is filled with a predetermined amount of each empty can.
[0016]
And each can filled with beverages is installed in a clean booth with a substantially aseptic atmosphere (air cleanliness is class 100) through a can transport path in a transport tunnel with a substantially aseptic atmosphere (air cleanliness is class 100). Sterilized can lid supplied through a chute in a substantially aseptic atmosphere (air cleanliness is class 100) from the can lid sterilizer. After being placed on a beverage-filled can and then sealed by sealing, it is carried out as a sterilized product of canned beverage to a predetermined location outside the clean room by a conveyor.
[0017]
The canned beverage production line using the aseptic filling system as described above is installed in a clean room with a low level of air cleanliness (class 100,000) provided in the factory building as shown in FIG. In addition, each clean booth that houses beverage filling machines (fillers) and can lid wrapping machines (seamers) used in the filling and sealing process of the production line, and a transport tunnel (cans not shown) connected to each clean booth As for the aseptic filling area, air cleanliness is maintained at a high level (class 100), and the air cleanliness is at a medium level so as to surround the entire aseptic filling area. A (class 1,000) clean room is further defined in a clean room with a low level of air cleanliness (class 100,000).
[0018]
And the air pressure in the aseptic filling area with high air cleanliness (each clean booth and the transport tunnel connected to it) is maintained at a pressure slightly higher than the air pressure in the clean room with medium air cleanliness. The air pressure in a clean room with a medium level of air cleanliness is maintained at a pressure slightly higher than the pressure in a clean room with a low level of air cleanliness. The atmospheric pressure in the factory building is slightly higher than or equal to the atmospheric pressure.
[0019]
The air cleanliness class is based on the NASA standard, and a predetermined space (ft ^Three ) The degree of cleanliness of air is indicated by the number of reference particles (particle diameter of 0.5 microns or more) present per unit, and class 100 has 11 to 100 reference particles / ft. ^Three Class 1000 is 101-1000 pieces / ft ^Three , Class 100,000 is 10,000 to 100,000 pieces / ft ^Three It is. (Class 1 has 0 to 1 reference particles / ft ^Three Class 10 is 2-10 pieces / ft ^Three It is. )
[0020]
By the way, about the clean booth provided in the aseptic filling area of the beverage canning production line by the aseptic filling system as described above, as shown in FIG. A transport tunnel 4 for covering the transport conveyor 3 to the can lid winding machine and a transport tunnel 6 for covering the chute 5 for supplying the sterilized can lid are connected. A fan / filter unit 7 comprising a blower fan 8 and a filter 9 (ULPA filter, HEPA filter, etc.) is attached, and in the lower part of the clean booth 1, there are a plurality of dampers 10 that are opened and closed by their own weight by a slight differential pressure. Is provided.
[0021]
As a result, aseptic air (substantially aseptic air with an air cleanliness class of about 100) is supplied to the clean booth 1 through the filter 9 by the rotation of the fan 8 of the fan / filter unit 7, and the air pressure in the clean booth 1 When the air pressure exceeds a predetermined value, the damper 10 is automatically opened by the atmospheric pressure to release the sterile air in the clean booth 1 to the outside, so that the sterile air is always replaced and the atmospheric pressure in the clean booth 1 is The inside of the clean booth 1 is maintained at a high level (class 100) air cleanliness.
[0022]
Further, inside the clean booth 1, as shown in FIG. 2, a sanitary pipe 11 (for spraying a chemical solution or washing water from the spray nozzle on the surface of the can lid winding machine 2 or the inner surface of the clean booth 1) (Not shown in FIG. 1), and a super steam pipe for spraying superheated steam (super steam) with a spray nozzle from around the main body of the can lid winder 2 toward the winding work area 12 is piped, and during daily work operation, it is only sterilized and washed by spraying chemicals and washing water from the sanitary pipe 11, and at the start-up of the line, after overhaul, and for daily maintenance When complicated parts are replaced, sterilization is also performed by spraying superheated steam from the super steam pipe 12.
[0023]
As shown in FIGS. 3 and 4, the super steam pipe 12 piped in the clean booth 1 can spray superheated steam toward the tightening work area and does not obstruct the tightening work. Are provided so as to surround the lower part of the winding region portion 2a of the can lid winding machine 2, and are provided so as to spray the superheated steam upward. It sprays upwards from the spray nozzle provided in large numbers by the predetermined pitch (pitch of about 10 cm) on the upper surface of this.
[0024]
In addition, about the installation state of the super steam pipe | tube 12, it is not restricted to what was fixed to the position as shown in FIG.3 and FIG.4, You may make it move to a winding work area | region only at the time of spraying of superheated steam ( Then, it is not particularly affected by the piping layout), and it may be directly connected to the main body side of the can lid winding machine 2 and connected to the winding work area through the inside of the main body, The temperature near the spray nozzle of the super steam pipe 12 becomes higher, so in order to increase the temperature rising effect of the winding region 2a of the can lid winding machine 2 and to shorten the time required for the heating, it is an obstacle to the winding operation. It is effective to bring the super steam pipe 12 as close as possible to the winding region portion 2a of the can lid winding machine 2 in a region where it does not become necessary.
[0025]
As for the sterilization in the clean booth using the sanitary pipe and super steam pipe as described above, before the start of daily production and after the end of production, the spray nozzle of the sanitary pipe is applied to the surface of the can lid winding machine and the inside of the clean booth. The surface of the can lid winding machine and the inner wall of the clean booth are sterilized and cleaned by sequentially spraying chemicals, hot water and hot water. Specifically, for example, oxonia ( (Product name: Ecolab Co., Ltd.) 4-5% x 70 ° C x 5 minutes of chemical sterilization, aseptic hot water 70 ° C x 5 minutes water washing, sterile hot water 90 ° C x 5 minutes hot water washing, After the daily production is completed, washing with sterile hot water 70 ° C. × 2 minutes, Topacs (product name: Ecolab Co., Ltd.) 2-5% × 70 ° C. × 5 minutes of chemical solution washing, sterile hot water 70 ° C. × 5 minutes Rinse with water sequentially.
[0026]
Also, sanitary pipes are sterilized and washed at the time of start-up and after overhaul when the line is installed. (For sanitary pipes, sterilization and washing are performed on a regular basis and at startup and after overhaul. In addition, there is a slight difference in the process), and further, steam (super steam) heated to 160 ° C. or higher (preferably 350 ° C. or higher) is sprayed from the spray nozzle of the super steam pipe into the clean booth, At least the tightening region of the can lid winding machine, that is, the surface and the inside of the seaming head, etc. are maintained for about 10 minutes after reaching 150 ° C. Not only after overhaul and maintenance, but also regularly every few weeks to once a month.
[0027]
The super steam device for supplying superheated steam (super steam) to the super steam pipe in the clean booth, as shown in FIG. 6, is a super for heating up the saturated steam supplied from the source of saturated steam. A steam heater is installed outside the clean booth 1, and this super steam heater burns propane gas in the middle of the steam supply pipe connected to the super steam pipe 12 to heat up the saturated steam passing through the pipe. Thus, the saturated steam is changed to superheated steam at 160 ° C. or higher (preferably 350 ° C. or higher).
[0028]
The superheated steam heated to 160 ° C. or higher (preferably 350 ° C. or higher) by the super steam heater is supplied to the super steam pipe 12 in the clean booth 1, and the spray nozzle of the super steam pipe 12 is used in the clean booth 1. The temperature of the winding region 2a itself of the can lid winding machine 2 is raised to 150 ° C. or higher by spraying onto the can lid winding machine 2 including the lubricating oil in the seaming roll. The winding region 2a can be reliably heat sterilized.
[0029]
As for the temperature of superheated steam by the super steam heater, for example, a temperature check means is provided so that a thermocouple can be installed at a predetermined location of the winding region 2a of the can lid winding machine 2 and the temperature history of these locations can be measured and displayed. To control the temperature of the winding region 2a of the can lid winding machine 2 while observing the temperature reached, and the time for the temperature of the winding region 2a of the can lid winding machine 2 to reach 150 ° C. In order to shorten the temperature, it is only necessary to increase the heat amount of the super steam heater to increase the temperature of the superheated steam.
[0030]
In this embodiment, the winding region 2a of the can lid winding machine 2 is held for 10 minutes after the temperature reaches 150 ° C. However, after the temperature reaches 150 ° C., the supply of superheated steam is stopped. However, there is no particular problem in practical use. In addition, the practical heat-killing condition of bacteria may be 140 ° C. or higher, and the safety factor is 150 ° C.
[0031]
As described above, high-temperature superheated steam is sprayed from the super steam pipe 12 in the clean booth 1 as described above. In this embodiment, the sprayed superheated steam enters the fan / filter unit 7. In order to prevent damage to the filter 9 and electrical components, a shutter means 13 such as a slide shutter is provided at a connecting portion between the fan / filter unit 7 and the clean booth 1 so as to be able to open and close between the two. The shutter means 13 is not particularly limited in structure, and may be manually opened / closed or automatically opened / closed.
[0032]
Further, by using an electric motor by inverter control as a motor (not shown) for driving the fan 8 of the fan filter unit 7, the fan filter can be used when the superheated steam is sprayed from the super steam pipe 12. When the unit 7 and the clean booth 1 are interrupted by the shutter means 13, the fan drive motor of the fan / filter unit 7 is configured to rotate at a slow speed by decreasing the frequency by inverter control.
[0033]
The panel wall of the clean booth 1 is made of a double-structured stainless steel plate having an air insulation layer in the middle (for example, a stainless steel plate having a thickness of 2 mm is provided twice at an interval of about 40 mm in width, The panel wall has a structure with an air insulation layer sandwiched between steel plates. The inner surface of the panel wall is smooth enough to be easily washed away even when chemicals, hot water, or oil stains adhere to it. As shown in FIG. 1, an aseptic heat-resistant glove (not shown) for performing manual operation in the clean booth 1 from the outside is provided on the panel wall that is a side wall portion of the clean booth 1. A glove hole 14 to be attached is formed.
[0034]
Further, as shown in FIG. 2 (not shown in FIG. 1), it is surrounded by a panel wall so as to substantially correspond to the winding region portion 2a and the drive portion 2b (gear box, etc.) of the can lid winding machine 2. The space is divided into an upper area 1a surrounding the winding region portion 2a as a clean booth 1 and a lower area 1b surrounding the drive portion 2b, and the super steam pipe 12 is an upper area forming the clean booth 1. It is piped in 1a.
[0035]
As shown in FIG. 4, the partition wall 15 for separating the upper area 1a and the lower area 1b is formed with a recess 16 for drainage and exhaustion at an appropriate position, as shown in FIG. The interior of 16 communicates with the damper 10 on the side, and a drain pipe 17 is connected to the bottom of the recess 16, and the damper 10 is opened by a slight pressure difference, so that the clean booth 1 (upper area 1 a) is opened. Aseptic air flows, and the waste liquid after sterilization / washing is collected in the recess 16 without being collected in the clean booth 1 (upper area 1a) and discharged from the drain pipe 17 to the outside.
[0036]
In the present embodiment, the upper area 1a and the lower area 1b of the can lid winding machine 2 are cleaned by separating the upper area 1a and the lower area 1b by the partition wall 15 in the space surrounded by the panel wall. By using the booth, the sanitary pipe 11 and the super steam pipe 12 can be sterilized in the clean booth efficiently in a narrow range. However, in some cases, the partition wall 15 is not provided (the partition wall in FIG. 1). As a clean booth, the entire space surrounded by the panel walls is used as a clean booth, and the sanitary pipe 11 and super steam are placed in the upper part (near the winding area 2a of the can lid winding machine 2). While the pipe 12 is piped, the damper 10 and the drain pipe 17 may be provided at the lower end portion thereof.
[0037]
According to the clean booth sterilization structure of the aseptic filling system of the present embodiment using the clean booth 1 as described above, the superheated steam is sprayed by the super steam pipe 12 in the clean booth 1, thereby The winding region of the can lid winding machine 2 can be used for the complicated intricate portions that are difficult to sterilize and clean with chemicals and hot water in the winding region portion 2a, and also for the lubricating oil itself accumulated in such portions. The temperature of the portion 2a itself can be heated and sterilized quickly under the heat-killing bacteria heat-killing conditions, and the sterility (substantially aseptic) in the clean booth 1 can be reliably maintained. it can.
[0038]
In addition, although the high-temperature superheated steam is sprayed by the super steam pipe 12 in the clean booth 1, when the superheated steam is sprayed, the connecting portion between the fan / filter unit 7 and the clean booth 1 is blocked by the shutter means 13. Therefore, it is possible to prevent the superheated steam from entering the fan / filter unit 7 or directly affecting the heat of the superheated steam, and the filters and electrical components in the fan / filter unit 7 are affected by the superheated steam. Corrosion and damage can be prevented, and shortening of the life of the fan / filter unit 7 due to overheated steam can be prevented.
[0039]
In particular, in the present embodiment, when the fan / filter unit 7 and the clean booth 1 are blocked by the shutter means 13 during spraying of superheated steam, the fan drive motor of the fan / filter unit 7 controls the frequency by inverter control. By being configured to rotate and rotate at a slow speed, the seal portion of the shutter means 13 is not required to have high airtightness, and even if it has a simple packing structure and is not completely blocked by the shutter means 13, the fan It is possible to effectively prevent the superheated steam from entering the fan / filter unit 7 because the pressure in the filter unit 7 is higher than that in the clean booth 1.
[0040]
Moreover, in this embodiment, since the panel wall of the clean booth 1 is a double-structured stainless steel plate having an air insulation layer in the middle, even if high-temperature superheated steam is sprayed in the clean booth 1, The panel wall will not be deformed or distorted by the heat of the panel, and there will be a problem that it becomes impossible to maintain the cleanliness of the air in the clean booth due to a gap between the panel walls due to deformation or distortion of the panel wall. There is nothing that can happen. In addition, because the heat insulation of the panel wall of the clean booth 1 is high, the temperature of the can lid winder 2 can be quickly and efficiently raised in the clean booth 1 without releasing the heat of the superheated steam from the panel wall to the outside. Thus, sterilization can be performed effectively in a short time without using superheated steam more than necessary.
[0041]
Furthermore, in this embodiment, the space surrounded by the panel wall so as to substantially correspond to the winding region portion 2a and the drive portion 2b (gear box or the like) of the can lid winding machine 2 is used as the clean booth 1 as the winding region. The can lid winding machine 2 that is divided into an upper area 1a surrounding the portion 2a and a lower area 1b surrounding the drive portion 2b, and a super steam pipe 12 is piped in the upper area 1a. As a result, the superheated steam can be efficiently sprayed onto the winding region portion 2a of the can and the drive portion 2b of the can lid winding machine 2 can be prevented from being deteriorated due to high heat of the superheated steam.
[0042]
As mentioned above, although one embodiment of the clean booth sterilization structure of the aseptic filling system of the present invention has been described, the present invention is not limited only to the above-described embodiment, and its use is limited to the production of canned beverages. The present invention is not limited and can be applied to the production of cans of other contents. , If the super steam pipe is not fixedly installed and is moved to the winding work area only when superheated steam is sprayed, the temperature in the winding area of the can lid winder can be quickly increased. Since the temperature can be raised well, the space surrounded by the panel walls so as to cover the entire can lid winding machine is divided into an upper area (clean booth) and a lower area by a partition wall. It goes without saying that the design can be changed as appropriate, for example, the whole can be implemented as a clean booth.
[0043]
【The invention's effect】
According to the clean booth sterilization structure of the aseptic filling system of the present invention as described above, the winding work area by the can lid winding machine in the clean booth is surely sterilized by spraying superheated steam (super steam). It is possible to maintain the inside of the clean booth in a substantially aseptic state, and at the time of sterilization with superheated steam, the connection between the fan / filter unit and the clean booth is blocked by the shutter means, so that the inside of the fan / filter unit It is possible to prevent the filter and the electrical component from being corroded and damaged by the influence of the superheated steam, and it is possible to prevent the life of the fan / filter unit from being shortened due to the superheated steam.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of a clean booth (a clean booth that houses a can lid winding machine) according to an embodiment of the present invention.
FIG. 2 is a side view showing a piping state of a sterilizing pipe (sanitary pipe and super steam pipe) in a clean booth.
FIG. 3 is a side view showing a piping state of a super steam pipe with respect to a can lid winding machine in a clean booth.
FIG. 4 is a plan view showing a piping state of a super steam pipe with respect to a can lid winding machine in a clean booth.
FIG. 5 is a side explanatory view schematically showing the entire aseptic filling area in a canned beverage production line using an aseptic filling system.
FIG. 6 is an explanatory diagram showing a supply path of superheated steam (super steam) to a super steam pipe piped in a clean booth.
[Explanation of symbols]
1 Clean booth
2 Can lid winding machine
2a Winding area part (of can lid winding machine)
2b Drive part (of can lid winding machine)
7 Fan filter unit
12 Super Steam Tube
13 Shutter means

Claims (2)

A fan / filter unit for supplying aseptic air into a clean booth, which is a clean booth for covering at least a tightening work area of a can lid winding machine used in an aseptic filling system with a substantially aseptic atmosphere. In the clean booth, the super steam pipe for spraying superheated steam to the winding area of the can lid winding machine is installed in the clean booth, and the fan / filter unit, clean booth, Shutter means is provided at the connecting part to open and close between the two, and when the superheated steam is sprayed from the super steam pipe, there is a shutter means between the fan / filter unit and the clean booth. When shut off, the fan drive motor of the fan / filter unit is controlled by inverter control. By rotating at very low speed drop frequency, clean booth sterilized structure of aseptic filling system fan filter unit is characterized by being configured such that the positive pressure than the clean booth. The clean booth sterilization structure for an aseptic filling system according to claim 1 , wherein the panel wall of the clean booth is made of a stainless steel plate having a double structure having an air insulation layer in the middle.

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