JP2017226468A - Sterilization method and device of paper container - Google Patents

Abstract

Disclosed is a paper container sterilization method and apparatus capable of reliably sterilizing an end surface of paper in sterilization of a paper container.
The disinfectant leaked from the inner surface of the sprayed germicide gas is guided by a guide plate 15 provided so as to surround the spray hole of the nozzle 14 for spraying the germicide gas toward the inner surface of the paper container 11. The gas is guided to the end face of the paper container.
[Selection] Figure 1

Description

  The present invention relates to a paper container sterilization method and apparatus.

  2. Description of the Related Art Conventionally, in a paper container aseptic filling and packaging machine, a paper container sterilization method has been proposed in which a mist of hydrogen peroxide is sprayed on the inner and outer surfaces of a paper container to dry the mist adhering to the surface of the paper container. (Patent Document 1).

  In addition, a paper container sterilization method has been proposed in which hydrogen peroxide gas is jetted onto a paper container and the hydrogen peroxide condensed on the surface of the paper container is dried with hot air (Patent Document 2).

JP-A-9-240629 Japanese Patent Application Laid-Open No. 10-119934

  According to the method for sterilizing a paper container described in Patent Document 1, a mist of hydrogen peroxide solution is sprayed on a paper container after molding a sleeve and a bottom before being molded into a paper container. In order to sterilize, a large amount of hydrogen peroxide is used. Since the method for sterilizing a paper container described in Patent Document 2 uses a hydrogen peroxide gas, the amount of hydrogen peroxide used can be reduced. However, either method is insufficient to sterilize the bacteria present on the end face of the paper container.

  In the paper container, the number of bacteria present in the paper layer tends to be larger than the number of bacteria present on the inner and outer surfaces of the paper container. This is estimated to be caused by water repeatedly used in the paper making process. In addition, since polyethylene or the like is laminated on the surface of the paper that has been made, bacteria existing in the paper layer of the paper container do not come out of the surface.

  However, bacteria may be present on the end face of the paper constituting the paper container. If the bacteria are not sterilized, the bacteria remaining on the end surface after sterilization of the paper container may fall off from the end surface due to an air current or the like and adhere to the inner surface of the paper container. In that case, the contents of the product may be spoiled by the adhesion of bacteria. Moreover, if it falls in the filling process downstream from the sterilization process, the filling chamber to be maintained in a sterile atmosphere may be contaminated with bacteria, and an accident may be caused.

  In order to sterilize bacteria present in the paper layer, the sleeve before being formed into a paper container may be sterilized by ethylene oxide gas sterilization or radiation irradiation. However, both sterilization methods are cumbersome, the former may produce harmful compounds, and the latter may crosslink the polyethylene constituting the innermost layer to inhibit heat sealability, or decompose it to cause off-flavors. It had the problem that it might be the cause.

  The present invention has been made in order to solve the above-described problems, and a method and apparatus for sterilizing not only the inner and outer surfaces of the paper container but also the end surfaces with a relatively small amount of sterilizing agent in sterilization of the paper container. The purpose is to provide.

  In the paper container sterilization method according to the present invention, at least one surface of the open end of the sleeve, which is a cylindrical body having a wall surface formed by laminating paper, is closed to mold a bottomed cylindrical paper container, A method for sterilizing the paper container in an aseptic filling device for sterilizing, filling and sealing the paper container, wherein a gas of a sterilizing agent is blown from a nozzle toward an inner surface from an open end of the bottomed cylindrical paper container. The guide plate provided so as to surround the injection hole of the nozzle guides the bactericidal gas leaked from the inner surface out of the bactericidal gas injected to the inner surface to at least the end surface of the open end. And

  In the paper container sterilization method according to the present invention, it is preferable that the nozzle is inserted into the paper container and the sterilizing gas is sprayed.

  In the paper container sterilization method according to the present invention, it is preferable that the one surface of the sleeve is closed by heat-sealing the inner surfaces.

  In the paper container sterilization method according to the present invention, it is preferable that the one surface of the sleeve is closed by injection molding a thermoplastic resin at an end portion.

  In the paper container sterilization method according to the present invention, it is preferable that the sterilizer contains at least hydrogen peroxide.

  Further, in the paper container sterilization method according to the present invention, the gas of the sterilizing agent is gasified by spraying the sterilizing agent into the vaporizing unit, and the gas of the sterilizing agent is emitted from the vaporizing unit nozzle of the vaporizing unit. It is preferable to spray toward the paper container.

  In the paper container sterilization method according to the present invention, it is preferable that the gas of the sterilizing agent is sprayed on the paper container after being diluted with hot air.

  In the paper container sterilization method according to the present invention, after the gas of the sterilizing agent is sprayed from the nozzle to the paper container, hot air is sprayed from the hot air nozzle toward the inner surface of the paper container. It is preferable that hot air leaked from the inner surface of the hot air sprayed to the inner surface is guided to at least the end surface of the open end by a guide plate provided so as to surround the injection hole of the air nozzle.

  The paper container sterilization apparatus according to the present invention has a wall surface formed by laminating at least paper and closes one surface of an open end of a sleeve which is a cylindrical body having a substantially rectangular cross section, and has a bottomed cylindrical shape. In an aseptic filling apparatus that molds a paper container and performs sterilization, filling, and sealing of the paper container, while blowing a germicide gas from a nozzle toward the inner surface from the open end of the bottomed cylindrical paper container, The guide plate provided so as to surround the injection hole of the nozzle guides the bactericide gas leaked from the inner surface out of the bactericide gas injected to the inner surface to at least the end surface of the open end. .

  In the paper container sterilization apparatus according to the present invention, it is preferable that the nozzle is provided so as to be inserted into the paper container.

  The paper container sterilization apparatus according to the present invention is preferably provided with a device for heat-sealing the inner surfaces to close one surface of the sleeve.

  In the paper container sterilization apparatus according to the present invention, it is preferable that a device for injection-molding a thermoplastic resin is provided at an end in order to close one surface of the sleeve.

  In the paper container sterilizing apparatus according to the present invention, it is preferable that the nozzle is disposed at a tip portion of a vaporizing portion that is gasified by spraying the sterilizing agent.

  The paper container sterilizing apparatus according to the present invention is preferably provided with an apparatus for diluting the gas of the sterilizing agent with hot air.

  The paper container sterilization apparatus according to the present invention, after the gas of the sterilizing agent is sprayed from the nozzle to the paper container, blows hot air from the hot air nozzle toward the inner surface of the paper container, It is preferable that the hot air leaked from the inner surface of the hot air injected to the inner surface is guided to at least the end surface of the open end by a guide plate provided so as to surround the injection hole.

  According to the present invention, the disinfectant gas discharged from the inner surface of the paper container is guided to the guide plate by the guide plate provided so as to surround the nozzle injection hole for spraying the disinfectant gas on the inner surface of the paper container. Since it contacts the end surface of the paper container, the end surface of the paper container can be reliably sterilized.

It is a side view which shows the outline of the aseptic filling apparatus incorporating the sterilization apparatus of the paper container which concerns on this invention. The sleeve before shape | molding to the paper container based on embodiment of this invention is shown. 1 shows an aseptic filling product according to an embodiment of the present invention. The gas spraying process of the bactericidal agent to the paper container based on Embodiment of this invention is shown. 1 shows a bactericide gas generator incorporated in a paper container sterilizer according to the present invention. The hot air spraying process to the paper container based on embodiment of this invention is shown. The gas spraying process of the bactericide to the modification of a paper container based on embodiment of this invention is shown.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings.

(Outline of method and apparatus)
As shown in FIG. 1, an aseptic filling device 16 incorporating a paper container sterilization apparatus according to the present embodiment receives a sleeve supply device 2 and a sleeve 1 supplied from the sleeve supply device 2, and receives a paper container 11. A bottom assembly apparatus 7 for forming the paper container, a conveyor 12 for transporting the formed paper container 11, a filling apparatus 20, and a head seal device 23 for sealing the paper container after filling. These devices are in the sterile chamber 3.

(Outline of aseptic filling equipment process)
As shown in FIG. 1, a sleeve 1 that is a cylindrical body having a wall surface formed by laminating at least paper and having a substantially rectangular cross section is introduced into an aseptic chamber 3 by a sleeve supply device 2. The sleeve 1 is inserted into a mandrel 4 provided in the turret 10 while leaving a portion necessary for closing. Further, the inner surface of the sleeve 1 on which the mandrel 4 is not inserted and the outer surface of the sleeve 1 are sterilized by the sterilizer 5. After the sterilization, the remaining sterilizing agent is removed by hot air blown by the drying device 6.

Further, as shown in FIG. 2, the sleeve 1 is folded at the bottom forming ruled line 25 b of the paper container 11 by the bottom folding device 8, and the portion heated by the drying device 6 is crimped by the bottom sealing device 9. In this way, the sleeve 1 is formed into a bottomed cylindrical paper container 11 by closing one surface of the open end.

  The molded paper container 11 is intermittently conveyed by the conveyor 12, and the bactericidal gas generated by the bactericide gas generator 13 is sprayed from the nozzle 14 onto the inner surface of the paper container 11. Here, as shown in FIG. 4, among the bactericide gas sprayed on the inner surface of the paper container 11 by the guide plate 15 provided so as to surround the injection hole 14 a of the nozzle 14, the inner surface of the paper container 11. The gas of the bactericide leaking from the air is guided to the end surface and the outer surface of the open end of the paper container 11.

  The disinfectant sprayed on the paper container 11 is removed by hot air sprayed from the hot air nozzle 18 onto the inner surface of the paper container 11. The hot air is supplied by a hot air supply device 17. Further, aseptic air may be blown from the sterile air nozzle 19 to the inner surface of the paper container 11.

  The sterilized paper container 11 is filled with the content sterilized by a separately provided device by the filling device 20. Further, the head forming ruled line 25 c of the paper container 11 is folded by the head folding device 21, the inner surface is heated by the head heating device 22, and is crimped and sealed by the head sealing device 23. The sealed paper container 11 becomes the aseptic filling product 24.

(Details of paper container sterilization method and apparatus)
The sleeve 1 in this embodiment is shown in FIG. The sleeve 1 is formed by laminating at least paper, and is provided with a cylinder pasting portion 26 so as to have a cylindrical shape. The body forming ruled line 25a, the bottom forming ruled line 25b for folding when being formed into the paper container 11, the head It has a forming ruled line 25c.

The sleeve 1 has a thermoplastic resin such as polyethylene or polypropylene which can be heat sealed as layers on both sides of the paper. Also, barriers such as aluminum foil, films deposited with metals or metal oxides such as aluminum, silica, and aluminum oxide, copolymers of ethylene-vinyl alcohol copolymer or aromatic diamine and dibasic acid, as required May be provided as a layer on the inside of the paper. Further, printing may be performed on the outer or outermost surface of the paper. Further, as the intermediate layer, one layer or two or more layers made of an adhesive or an adhesive thermoplastic resin may be provided. For example, the sleeve 1 is composed of polyethylene / printing / paper / polyethylene, polyethylene / printing / paper / polyethylene or ethylene-methacrylic acid copolymer / aluminum foil / polyethylene, printing / polyethylene / paper / polyethylene / ethylene-vinyl alcohol co-polymer. Polymer / polyethylene, printing / polyethylene / paper / ethylene-methacrylic acid copolymer / polyester film with silica deposition / adhesive / polyethylene and the like. The basis weight of the laminated paper is 80g / m ^{2 to} 500g
/ M ² is preferred. If it is less than 80 g / m ² , there is no shape retention as a paper container, and if it exceeds 500 g / m ² , processing is difficult. The heat sealable layer is preferably 15 μm to 150 μm. If it is less than 15 μm, sufficient heat seal strength cannot be obtained, and if it exceeds 150 μm, the heat seal strength is sufficient, which is excessive. The sleeve 1 is obtained by punching such a laminate and sticking the body part by heat sealing.

  The body pasting portion 26 of the sleeve 1 is formed by heat sealing the inner surface and the outer surface of the sleeve 1. Here, the end face of the inner laminated body of the trunk pasting portion 26 is formed so as not to be exposed. This is performed by hemming that folds the tip of the end portion that becomes the inside outward, skive hemming that cuts the inside of the tip and folds it outward, or by sticking a tape having heat sealability on both ends. Thereby, it can prevent that a microbe transfers to a content from the end surface of the paper of the laminated body inside the trunk | drum pasting part 26, and can prevent a content from osmose | permeating into paper.

Since the sleeve 1 is folded along the ruled line by the body forming ruled line 25a, it becomes a substantially rectangular cylindrical body. However, when the ruled line is shallow or the paper is thin, the side of the cross-sectional shape of the cylindrical body is In some cases, the shape of the sleeve 1 may be an arc shape, and when the ruled line is not partially provided, the cross section of the portion of the sleeve 1 may be substantially circular. Furthermore, there may be a polygonal portion such as a hexagon instead of a rectangle.

After the sleeve 1 is conveyed to the sterilization chamber 3, the bottom is formed by heat-sealing the inner surface, and the sleeve 1 is molded into a paper container 11. The heat seal heats the inner surface with hot air, folds the triangular portion of the bottom forming ruled line 25b inside, and even if the top of the triangle is abutted and crimped, the triangular portion is brought out to the outside, and after crimping, the triangular portion is put into a paper It may be folded to the side surface of the paper container and adhered to the outer surface of the paper container 11 or may be folded to the heat seal portion side to form the bottom. Further, the heat sealing may be performed by a heat sealing by heating from the outside with the triangular portion outside, an ultrasonic heat sealing, or a high frequency heat sealing when the sleeve 1 includes an aluminum foil as a layer.

  In this embodiment, the bottom portion is formed on the sleeve 1 and molded into the paper container 11. However, as shown in FIG. 7, an injection molding portion 30 is provided on one of the open ends of the sleeve 1 by injection molding. By closing the end, the paper container 31 can be formed by injection molding. This is done by inserting one of the open ends of the sleeve 1 into a mold and injection-molding a thermoplastic resin such as polyethylene or polypropylene into a shape that becomes the head of the paper container. Since the end portion is covered with the injected resin, even if the bacterium is present at the end portion, the bacterium does not fall off. A pull ring may be formed at the tip of the injection molding unit 30 and the injection molded part 30 may be opened by pulling off the injection molded film. The opening may be provided with a cap. When it becomes an aseptic filling product, the injection molding part 30 becomes a head, and one open end becomes a bottom.

  The molded paper container 11 is sprayed with bactericidal gas on the inner surface. The bactericidal agent in this embodiment preferably contains at least hydrogen peroxide. The content is suitably in the range of 0.5% to 65% by mass. If it is less than 0.5% by mass, the sterilizing power may be insufficient, and if it exceeds 65% by mass, it becomes difficult to handle for safety. Further, it is more preferably 0.5% by mass to 40% by mass. When the content is 40% by mass or less, the handling is easier, and since the concentration becomes low, the residual amount of the sterilizing agent after sterilization can be reduced.

  The bactericide contains water, but alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, normal propyl alcohol, and butyl alcohol, ketones such as acetone, methyl ethyl ketone, and acetylacetone, and one or two of glycol ether It may contain more than seeds.

  Furthermore, the bactericidal agent may contain additives such as peracetic acid, acetic acid, chlorine compounds, compounds having a bactericidal effect such as ozone, cationic surfactants, nonionic surfactants, and phosphoric acid compounds.

  The disinfectant is gasified by the disinfectant gas generator 13 as shown in FIG. The disinfectant gas generator 13 includes a disinfectant supply unit 27 that is a two-fluid spray nozzle that supplies disinfectant in the form of drops, and disinfects the disinfectant supplied from the disinfectant supply unit 27 below the decomposition temperature of hydrogen peroxide. And a vaporizing section 28 for vaporizing by heating. The disinfectant supply unit 27 introduces disinfectant and compressed air from the disinfectant supply path 27a and the compressed air supply path 27b, respectively, and sprays the disinfectant into the vaporization unit 28. The vaporizer 28 is a pipe having a heater 28a sandwiched between inner and outer walls, and heats and vaporizes the bactericide blown into the pipe. The vaporized bactericidal gas is ejected from the nozzle 14 to the outside of the vaporizing section 28. The vaporizer 28 may be heated by dielectric heating instead of the heater 28a.

As operating conditions of the sterilizing agent supply unit 27, for example, the pressure of the compressed air is adjusted in a range of 0.05 MPa to 0.6 MPa. Further, the bactericide may be dropped by gravity or may be pressurized, and the supply amount can be freely set, for example, 1 g / min. ~ 100g / min
. Supply in the range. Moreover, the sprayed germicide vaporizes by heating the inner surface of the vaporization part 28 from 140 degreeC to 450 degreeC.

  The germicide gas to be ejected is sprayed from the nozzle 14 to the inner surface of the paper container 11 as shown in FIG. A guide plate 15 provided so as to surround the injection hole 14 a of the nozzle 14 covers the entire open end of the paper container 11 from the periphery of the nozzle 14, collides with the bottom of the paper container 11, and What is necessary is just to guide | inject the gas of the disinfectant leaked from the inner surface to the edge part of the open end of the paper container 11 at least. For example, as shown in FIG. 4, it is preferable that the canopy 15a of the guide plate 15 is provided with an inclination from the nozzle 14 to the lower part and the end is a vertical surface 15b. However, any shape may be used as long as the disinfectant gas can contact the end face of the open end of the paper container 11. At this time, it is preferable to provide a gap between the guide plate and the carton so that the pressure inside the paper container is at least 5 Pa higher than the atmospheric pressure because the disinfectant can adhere to every corner of the carton.

  The nozzle 14 may spray a sterilizing gas from the upper part of the open end of the paper container 11 to the inner surface of the paper container 11, but is inserted into the paper container 11 in order to surely sterilize the inner surface of the paper container 11. It is preferable to spray the gas of the disinfectant.

  The amount of sterilizing gas sprayed is arbitrary, but the amount of spraying depends on the amount of sterilizing agent supplied to the sterilizing agent gas generator and the spraying time. A plurality of bactericidal gas generators may be provided. Although the spraying amount varies depending on the size of the paper container, the amount of hydrogen peroxide is suitably 10 μL / container to 200 μL / container in terms of 35% by mass. The range of is appropriate. If the amount is less than 10 μL / container, the sterilization becomes insufficient. If the amount exceeds 200 μL / container, the amount of hydrogen peroxide remaining in the paper container 11 increases.

  The gas of the sterilizing agent exits from the nozzle 14 and then flows into the inner surface of the paper container 11 in a gas state or as a condensed mist of the gas or as a mixture thereof. The liquid is leaked from the paper container 11 and guided to the end surface of the open end of the paper container 11.

  Note that aseptic air that has passed through a sterilization filter may be heated in the middle of the nozzle 14 and supplied as hot air. Thereby, the spraying pressure of the sterilizing agent gas from the nozzle 14 is increased, and the spraying pressure of the sterilizing agent gas to the open end of the paper container 11 is also increased. Moreover, by setting it as hot air, condensation of disinfectant gas can be suppressed and it can disinfect efficiently. The temperature of the hot air can be 50 ° C to 150 ° C. If the temperature is lower than 50 ° C, condensation is promoted. If the temperature exceeds 150 ° C, when the innermost layer of the paper container 11 is polyethylene, the heat-sealed polyethylene surfaces may be separated.

  Further, as shown in FIG. 7, even if the paper container is a paper container 31 by injection molding, it is injected to the inner surface of the paper container 31 by the guide plate 15 provided so as to surround the injection hole 14a of the nozzle 14. Among the sterilizing gas, the sterilizing gas leaked from the inner surface can be guided to at least the end face of the open end.

  Note that the paper container 11 may be preheated by, for example, blowing hot air to the paper container 11 immediately before spraying the germicide gas to the paper container 11 shown in FIG. This preheating can further enhance the sterilizing effect of the paper container 11.

  Further, not only one nozzle 14 but also a plurality of nozzles 14 may be arranged along the traveling path of the paper container 11, and a bactericidal gas may be sprayed from the nozzle 14 toward the paper container 11 a plurality of times. .

  It is preferable that hot air is further blown onto the paper container 11 on which the bactericidal gas is blown. By spraying hot air, hydrogen peroxide adhering to the surface of the paper container 11 is activated. Further, the sterilizing agent attached to the paper container 11 by blowing hot air is quickly removed from the surface of the paper container 11.

  As shown in FIG. 6, a hot air nozzle guide plate 29 is provided so as to surround the hot air injection hole 18 a of the hot air nozzle 18 that blows hot air. It is preferable to guide the hot air at least to the end face of the open end of the paper container 11. Thereby, sterilization of the end face of the open end is promoted.

  The hot air nozzle guide plate 29 covers the entire surface of the open end of the paper container 11 from the periphery of the hot air nozzle 18 and collides with the bottom of the paper container 11 and leaks hot air leaked from the inner surface of the paper container 11 at least in the paper container. 11 may be used as long as it leads to the end face of the open end. For example, as shown in FIG. 6, it is preferable that the canopy 29a of the hot air nozzle guide plate 29 is provided with an inclination from the hot air nozzle 18 to the lower part and the end is a vertical surface 29b. However, any shape can be used as long as the hot air leaking from the inner surface of the paper container is guided to the open end face of the paper container 11.

  The temperature of the hot air can be 50 ° C to 150 ° C. If it is less than 50 ° C., it is insufficient for activating the bactericide, and if it exceeds 150 ° C., when the innermost layer of the paper container 11 is polyethylene, the heat-sealed polyethylene surfaces may peel off.

  Further, not only one hot air nozzle 18 but also a plurality of hot air nozzles 18 may be arranged along the traveling path of the paper container 11, and hot air may be blown from the hot air nozzle 18 toward the paper container 11 a plurality of times.

  Further, the hot air nozzle 18 may be sprayed from the upper part of the open end of the paper container 11 to the inner surface of the paper container 11, but in order to reliably remove the disinfectant adhering to the inner surface of the paper container 11, the paper container 11. It is also possible to insert hot air into the interior of the battery.

  Further, after spraying hot air to the paper container 11, aseptic air obtained by passing through a sterilization filter may be sprayed to the inner surface of the paper container 11 by the aseptic air nozzle 19. The sterilized air that is blown has the effect of removing the germicide remaining inside the paper container 11 and the off-flavor substance derived from polyethylene that constitutes the innermost surface of the paper container 11 generated by hot air.

  Here, a guide plate is provided so as to surround the injection hole of the sterilized air nozzle 19, and among the sterilized air injected to the inner surface of the paper container 11, aseptic air leaked from the inner surface of the paper container 11 is at least the open end of the paper container 11. You may lead to the end face. At this time, it is preferable to provide a gap between the guide plate and the carton so that the pressure inside the paper container is at least 5 Pa higher than the atmospheric pressure. This is because the disinfectant adhering to every corner of the carton can be reliably dried with hot air.

After the contents are filled in the paper container 11, the paper container 11 is sealed by heat-sealing the inner surface of the open end of the paper container 11, and an aseptic filling product 24 is obtained. The heat seal heats the inner surface with hot air, folds the triangular part of the head forming ruled line 25c inward, and puts the triangular apex to the outside even after crimping. Even if it folds to the side surface side of a container and sticks on the outer surface of the paper container 11, it does not matter even if it folds to the heat seal part side and makes it a bottom part. Further, the heat sealing may be performed by a heat sealing by heating from the outside with the triangular portion outside, an ultrasonic heat sealing, or a high frequency heat sealing when the sleeve 1 includes an aluminum foil as a layer.

  The aseptic filling product 24 shown in FIG. 3 has a gobbell top shape, but may have a brick shape with a flat head. In this case, an extraction port may be provided in the head. In addition, as shown in FIG. 7, the paper container by injection molding may have a shape in which an extraction port is provided in the head made of a thermoplastic resin.

  The aseptic filling device 16 is supplied with aseptic air into the aseptic chamber 3 and is always kept at a positive pressure, so that there is no contamination by bacteria from outside air. Further, the aseptic filling device 16 shields the bottom assembly device 7, the sterilization device including the nozzle 14 and the hot air nozzle 18, the sealing device including the filling device 20, the head seal device 23, and the like into zones and blocks each zone. Sterile air may be supplied, and the supply pressure of the sterilized air may be inclined from the zone of the filling device 20 to the outside.

  Hereinafter, the present invention will be described with reference to examples.

(Method of operation)
A sleeve 1 as shown in FIG. 2 was prepared to be a 1000 ml capacity paper container 11 having a square cross section and 75 mm on one side. The configuration of the sleeve 1 was polyethylene 25 μm / paper 300 g / m ² / ethylene-methacrylic acid copolymer 20 μm / silica vapor-deposited polyester film 12 μm / adhesive / polyethylene 55 μm. Hot air is blown onto the inner surface of the bottom surface portion of the sleeve 1, the triangular portion of the bottom forming ruled line 25b of the sleeve 1 is folded inward, the apexes of the triangle are butted, and one open end of the sleeve 1 is closed. Thus, a paper container 11 was obtained. 10 ⁴ , 10 ⁵ , 10 ^{6 on} the four sides of the open end of the paper container 11
B. Atophaeus ATCC9372 spores were attached and then air-dried to make a paper container 11 with bacteria.

  As a bactericidal agent, hydrogen peroxide containing 35% by mass of hydrogen peroxide is used, and 0.5 ml of compressed air and 10 ml of hydrogen peroxide as a bactericide are added to a bactericide gas generator 13 as shown in FIG. / Min. Or 30 ml / min. The gas of the bactericidal agent was produced by supplying and setting the surface temperature of the vaporizing section 28 to 300 ° C. This disinfectant gas was sprayed from the nozzle 14 for 1 second to the inner surface of the paper container 11 as shown in FIG. At this time, spraying was performed even when there was no guide plate.

  Further, as shown in FIG. 6, hot air at 120 ° C. was blown onto the paper container 11 at a hot air nozzle 18 at a flow rate of 300 L / min for 6 seconds by the hot air nozzle 18. At this time, spraying was also performed when no guide plate was provided.

(Measurement method of bactericidal effect)
The end surface part of the paper container to which the bacteria were adhered was wiped off, transplanted to an agar medium, cultured at 37 ° C. for 1 week, and the number of viable bacteria was measured. The results were expressed as bactericidal effect (LRV) = log (number of adherent bacteria) / (number of surviving bacteria).

(Examples, comparative examples and results)
Table 1 shows the supply amount of hydrogen peroxide water, which is a sterilizing agent, the presence / absence of a guide plate at the time of spraying the gas of the sterilizing agent and the hot air, and the sterilizing effect thereof.

  According to the above-described embodiment, regardless of the amount of hydrogen peroxide water supplied as a sterilizing agent, by providing the guide plate so as to surround the injection hole 14a of the nozzle 14 when spraying the sterilizing agent, a high sterilizing effect is achieved. was gotten. Moreover, the sterilizing effect could be enhanced by providing a guide plate so as to surround the hot air injection hole 18a of the hot air nozzle 18 when hot air is sprayed. On the other hand, as in the comparative example, when there was no guide plate at the time of spraying the gas of the bactericidal agent, a sufficient bactericidal effect could not be obtained even if the supply amount of the bactericidal agent was increased.

  Although the present invention is configured as described above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Sleeve 11 ... Paper container 13 ... Gas generator of disinfectant 14 ... Nozzle 15 ... Nozzle guide plate 18 ... Hot air nozzle 24 ... Aseptic filling product 29 ... Hot air nozzle guide plate

Claims (15)

Aseptically performing sterilization, filling and sealing of the bottomed cylindrical paper container by closing one side of the open end of the sleeve which is a cylindrical body having a wall surface formed by laminating paper at least A method for sterilizing the paper container in a filling device,
The sterilization sprayed on the inner surface by a guide plate provided so as to blow the gas of the sterilizing agent from the nozzle toward the inner surface from the open end of the bottomed cylindrical paper container, and to surround the injection hole of the nozzle A sterilizing method for a paper container, wherein a sterilizing agent gas leaked from the inner surface of the agent gas is guided to at least an end surface of the open end. In the paper container sterilization method according to claim 1,
A method for sterilizing a paper container, wherein the nozzle is inserted into the paper container and the sterilizing gas is sprayed. In the paper container sterilization method according to claim 1 or 2,
The paper container sterilization method is characterized in that the one surface of the sleeve is closed by heat-sealing the inner surfaces. In the paper container sterilization method according to claim 1 or 2,
The paper container sterilization method is characterized in that the one surface of the sleeve is closed by injection molding a thermoplastic resin at an end portion. The paper container sterilization method according to any one of claims 1 to 4,
A method for sterilizing a paper container, wherein the sterilizing agent contains at least hydrogen peroxide. The paper container sterilization method according to any one of claims 1 to 5,
The disinfectant gas is vaporized by spraying the disinfectant into a vaporizing section, and the disinfectant gas is sprayed from the vaporizing section nozzle of the vaporizing section toward the paper container. Sterilization method. The paper container sterilization method according to any one of claims 1 to 6,
A method for sterilizing a paper container, wherein the gas for the sterilizing agent is sprayed on the paper container after being diluted with hot air. In the paper container sterilization method according to claim 1 or 7,
A guide plate provided so as to blow hot air from a hot air nozzle toward the inner surface of the paper container and surround an injection hole of the hot air nozzle after the gas of the sterilizing agent is sprayed from the nozzle to the paper container. The hot air leaked from the inner surface out of the hot air jetted onto the inner surface is guided to at least the end surface of the open end. Aseptically performing sterilization, filling and sealing of the bottomed cylindrical paper container by closing one side of the open end of the sleeve which is a cylindrical body having a wall surface formed by laminating paper at least In the filling device,
The sterilization sprayed on the inner surface by a guide plate provided so as to blow the gas of the sterilizing agent from the nozzle toward the inner surface from the open end of the bottomed cylindrical paper container, and to surround the injection hole of the nozzle A sterilizing apparatus for paper containers, wherein a sterilizing agent gas leaked from the inner surface of the agent gas is guided to at least an end surface of the open end. The paper container sterilizer according to claim 9,
The paper container sterilization apparatus, wherein the nozzle is provided so as to be inserted into the paper container. The paper container sterilization apparatus according to claim 9 or 10,
An apparatus for sterilizing a paper container, wherein a device for heat-sealing the inner surfaces is provided to close one surface of the sleeve. The paper container sterilization apparatus according to claim 9 or 10,
An apparatus for sterilizing a paper container, wherein a device for injection-molding a thermoplastic resin is provided at an end to close one surface of the sleeve. The paper container sterilizer according to any one of claims 9 to 12,
The paper container sterilizing apparatus is characterized in that the nozzle is disposed at a front end portion of a vaporizing portion that is gasified by spraying the sterilizing agent. The paper container sterilizer according to any one of claims 9 to 13,
A paper container sterilization apparatus comprising a device for diluting the sterilizing gas with hot air. The paper container sterilizing apparatus according to claim 9 or 14,
A guide plate provided so as to blow hot air from a hot air nozzle toward the inner surface of the paper container and surround an injection hole of the hot air nozzle after the gas of the sterilizing agent is sprayed from the nozzle to the paper container. Thus, the hot air leaked from the inner surface out of the hot air sprayed onto the inner surface is guided to at least the end surface of the open end.

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