JP2001120235A - Ultraviolet sterilization method in dried laver production process and external irradiation-type ultraviolet sterilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject method giving no influence on the taste and quality of a product, to provide an ultraviolet sterilizer suitable for a thick liquid, and to efficiently sterilize different kinds of liquid with a single ultraviolet sterilizer. SOLUTION: This sterilization method comprises sterilizing a raw laver-mixed liquid by ultraviolet irradiation prior to a straining process in dried laver production processes; wherein a stirring in the raw laver-mixed liquid is caused during the ultraviolet irradiation process so as to increase sterilization efficiency, and the water (recycling water) separated from the raw laver is sterilized in the ultraviolet sterilization process identical as that for the raw laver-mixed liquid. The other objective sterilizer has such a scheme that the flow paths of plural optically transparent pipes placed in juxtaposition close to ultraviolet lamps are connected to one another so as to be in series, and a fluid flowing through the pipes in series is repeatedly sterilized by the ultraviolet lamps so as to increase external irradiation-type sterilization ability; wherein a first and second fluids are each sterilized by ultraviolet rays through the first and second flow paths different from each other, and at least one ultraviolet lamp is shared in the first and second low paths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sterilizing ultraviolet light in a dry laver manufacturing process, and more particularly to an external irradiation type ultraviolet sterilizer usable for a dry laver manufacturing process and other uses.

[0002]

2. Description of the Related Art In a dry laver production process or a dry laver production apparatus, it is required to take sufficient sterilization measures due to problems in food hygiene management. There are various conventional technologies in the technical field of dry laver production (for example, Patent No. 2).
920506), but there is much room for improvement in terms of sterilization measures. The dry laver production process generally involves mincing (cutting) the raw laver and mixing it with fresh water to produce a raw laver mixture, and discharging the raw laver mixture onto a pond and sheeting the raw laver on the pond. A paper-making process, a dehydration process of dehydrating the raw nori, which has been formed on the cage, a drying process of drying the raw nori on the dehydrated cage, and drying the dried nori from the cage. It consists of a stripping process. As a conventional sterilization method, in a step of providing a raw laver mixture, an appropriate disinfectant (for example, sodium hypochlorite) is injected into the raw laver mixture, or sterilization is performed using ozone. I was

[0003]

However, the method of sterilization using sodium hypochlorite is not preferable because it affects the taste of the dried seaweed. Also, in the method of sterilizing using ozone, the dried seaweed produced by the bleaching action of ozone is decolorized, and the quality is reduced.
There is a disadvantage that. Therefore, establishment of an effective sterilization technique has been desired.

[0004] In addition, a large amount of fresh water is used in producing the raw nori mixed liquid (there is also a cost for water supply, etc.), and this large amount of water is used in the process of making and dehydrating the raw nori mixed liquid. Separated from It is economical to reuse the separated water for some purpose as reused water. For example, if it can be reused for the purpose of cleaning the cage after removing the dried seaweed, the cost of water for cleaning the cage can be saved. Also, if possible, the cost can be further reduced if it can be recycled and reused for producing the raw laver mixture. However, it is necessary to sufficiently sterilize the separated water so that it can be reused as recycled water. The water separated from the raw seaweed mixture (hereinafter referred to as “recycled water”) is easily sterilized by ultraviolet light because there is no or little mixture such as raw seaweed residue. It is considered to be sterilized.

However, since the raw seaweed mixture is a dense mixture of black raw seaweed mince, ultraviolet sterilization has not been considered at all. On the other hand, even when considering sterilization techniques for concentrated beverage liquids, because of its richness,
Ultraviolet sterilization was not considered at all. Accordingly, heat sterilization and the like have been the mainstream in sterilizing beverage liquids. However, heat sterilization has the problem of affecting the quality and taste of the beverage.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide an effective ultraviolet sterilization method which does not have the above-mentioned disadvantages in a dry laver production process. Another object of the present invention is to provide an external irradiation type ultraviolet sterilizer suitable for sterilizing other concentrated liquids such as a raw seaweed mixture. Another object of the present invention is to provide an external irradiation type ultraviolet sterilizer suitable for efficiently sterilizing different kinds of liquids such as a raw seaweed mixed liquid and reused water.

[0007]

According to the present invention, there is provided a method for sterilizing ultraviolet light in a process for producing dry laver, which comprises at least a paper-making step of discharging a raw laver mixture onto a cage to form the raw laver into a sheet. The process is characterized by including a sterilization step of sterilizing the raw laver mixture by irradiation with ultraviolet light before the paper-making step. Sterilization by ultraviolet irradiation is advantageous in that it does not affect the taste and quality of the finished dried seaweed product, unlike sterilization with a disinfectant or ozone. The present inventor has conducted various studies and conducted experiments on the stage of the dry laver production process in which sterilization by ultraviolet irradiation should be carried out. In the method performed, it was found that the sterilization of the surface was sufficient, but the sterilization of the inner layer of the laver sheet was completely insufficient. In that regard, it is advantageous to irradiate the raw seaweed mixed liquid with ultraviolet rays at an arbitrary stage before the paper making step, because the liquidity of the mixed liquid hardly causes sterilization unevenness.

[0008] In a preferred embodiment, the sterilization step is characterized in that the raw laver mixture is agitated in the course of ultraviolet irradiation. For example, when irradiating a raw laver mixture flowing in a certain pipeline with ultraviolet light,
If the pipeline is bent or inverted in the course of the ultraviolet irradiation, the flow of the raw laver mixture is disturbed at the bent portion, and stirring occurs naturally. Therefore, it is possible to sterilize the raw seaweed mixture liquid as evenly as possible.
Of course, the present embodiment is not limited to such natural stirring along the flow of the pipe, but also includes a form in which the stirring is positively caused (for example, the pipe is shaken or mechanically stirred). .

As a preferred embodiment, in the sterilization step, water (recycled water) separated from the raw seaweed mixed liquid in the course of the sheeting step or the dehydration step is also subjected to ultraviolet sterilization, and the separated water ( (Reused water) can be reused. Thereby, the raw seaweed mixture and the reused water can be sterilized together by the same sterilization method, so that it is extremely efficient and economical. As a specific embodiment in this case, the raw seaweed mixture and the separated water (reused water) are introduced into one ultraviolet sterilizer by different paths, and the one ultraviolet sterilizer is used. There is a form in which the raw seaweed mixture and the separated water (reused water) are sterilized. The sterilization of the raw seaweed mixture and the reused water can be sterilized by one ultraviolet sterilizer, which is extremely economical and requires no space. In this case, as a specific embodiment, at least one ultraviolet lamp in one ultraviolet sterilizer may be used in common to sterilize the raw seaweed mixture and the separated water (reused water). The use of the ultraviolet lamp is extremely economical and contributes to the downsizing of the entire apparatus. In another embodiment, the same ultraviolet lamp does not have to be shared for sterilizing the raw seaweed mixture and the separated water (reused water).

As a preferred embodiment, in the sterilization step, at least the raw seaweed mixture is sterilized using an external irradiation type ultraviolet sterilizer. According to the basic idea of the present invention, the ultraviolet sterilization of the raw seaweed mixture may be performed using either an internal irradiation type ultraviolet sterilization device or an external irradiation type ultraviolet sterilization device. The internal irradiation type ultraviolet sterilizer has a form in which an ultraviolet lamp is immersed in the liquid to be sterilized, and the external irradiation type ultraviolet sterilizer irradiates ultraviolet rays to the liquid to be sterilized by an external ultraviolet lamp. It is of the form. As a typical example of an external irradiation type ultraviolet sterilizer, a liquid is flowed through a light-transmitting pipe (not only a light-transmitting pipe, but also a light-transmitting pipe), and is disposed outside the pipe. There is an apparatus that sterilizes a liquid in a light-transmitting pipe by irradiating ultraviolet rays from an ultraviolet lamp. The use of this type of external irradiation type ultraviolet sterilizer is suitable for sterilizing a liquid containing a mince-like substance such as a raw seaweed mixture. That is, in the internal irradiation type ultraviolet sterilizer, the internal structure tends to be complicated by installing a plurality of rectifying plates in the interior so that a flow can be forcedly brought into contact with the built-in lamp. The mince-like substance inside is more likely to accumulate in specific places, and it is required to perform proper cleaning, which is troublesome.
Lamp replacement is also troublesome. In that respect, the use of an external irradiation type ultraviolet sterilizer is advantageous because such a trouble is not required.

As a specific embodiment in this case, in the external irradiation type ultraviolet sterilizer, a plurality of translucent pipes which are juxtaposed close to the ultraviolet lamp are connected in series. It is characterized by. This means that a plurality of translucent pipes arranged side by side are sequentially connected via a bent portion, and a series flow path is formed as a whole. Thereby, the direction of the flow of the mixed liquid in the plurality of translucent pipes arranged side by side becomes such that the liquid crystal is sequentially turned upside down as viewed from the external ultraviolet lamp. That is, at the bent portion, the flow direction of the mixed solution is reversed from upward to downward or from downward to upward, and accordingly, the mixed solution is disturbed. The seaweed mixture is naturally agitated, so that the ultraviolet light can be sterilized as uniformly as possible.

An external irradiation type ultraviolet sterilizer according to the present invention includes an ultraviolet lamp and a plurality of translucent pipes juxtaposed close to the ultraviolet lamp. The channels are connected in series, and the liquid passing through the pipes in series is sterilized repeatedly by the ultraviolet lamp. As before, this means that a plurality of translucent pipes juxtaposed are sequentially connected via a bend to form a series flow path as a whole, and the liquid passing through the pipes is naturally spontaneously formed. By causing the stirring, the ultraviolet sterilization can be performed as evenly as possible. Further, since the liquid passing through the pipes connected in series is repeatedly sterilized by the ultraviolet lamp, sufficient sterilization can be performed in a compact apparatus configuration as a whole and using a small number of ultraviolet lamps. Therefore, it is possible to provide a novel external irradiation type ultraviolet sterilizer suitable for sterilizing other concentrated liquids (for example, beverage liquids such as milk and coffee) such as a raw laver mixture.

An external irradiation type ultraviolet sterilizer according to another aspect of the present invention is a light emitting source including at least one ultraviolet lamp, and a first flow path for flowing a first liquid, wherein the light emitting source is And at least one ultraviolet ray in said light source, comprising at least one translucent pipe disposed in proximity to said at least one ultraviolet lamp, and a second flow path for flowing a second liquid. Having at least one translucent pipe disposed in proximity to the lamp, wherein at least one ultraviolet lamp in the light emitting source is shared by the first flow path and the second flow path It is characterized by. According to this, two different types of liquids can be sterilized by one ultraviolet sterilizer, so that it is extremely economical and requires no space. In addition, since at least one ultraviolet lamp is commonly used to sterilize two different types of liquids, sharing the ultraviolet lamp is extremely economical.
This contributes to downsizing of the entire device. Therefore, it is possible to provide an external irradiation type ultraviolet sterilizer suitable for efficiently sterilizing different kinds of liquids such as a raw seaweed mixed solution and reused water.

In a preferred embodiment, at least one of the first flow path and the second flow path has a plurality of translucent pipes juxtaposed close to the ultraviolet lamp, and the plurality of translucent pipes are provided. It is characterized in that the flow path of the light pipe is connected in series. As a result, as described above, the liquid passing through the pipe is naturally agitated, so that the ultraviolet sterilization can be performed as uniformly as possible.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram (or flowchart) schematically showing a dry laver production process to which a sterilization method according to one embodiment of the present invention is applied. The dry laver production process generally includes a step 1 of mincing (cutting) the raw laver and mixing it with fresh water to produce a raw laver mixture, and discharging the raw laver mixture onto a pond to produce the raw laver on the pond. A sheet forming step 2 for forming a sheet, a dehydrating step 3 for dehydrating the raw laver sheet while pressing the raw laver sheet formed on the cage with a sponge or the like to form a mold, The drying process includes a drying step 4 for drying the raw nori on the preserved cage, and a process 5 for removing the dried dry laver from the cage. As the basic configuration of the dry laver production process including these steps 1 to 5, a known fully automatic or semi-automatic dry laver production apparatus or system may be appropriately used. In the present invention, a sterilizing step 6 in which the raw seaweed mixture is sterilized by ultraviolet irradiation before the sheeting step 2 is performed.
Is provided. Further, the water separated from the raw seaweed mixture in the course of the sheeting step 2 and / or the dehydration step 3 is collected, and in the sterilization step 6, the separated water and the raw seaweed mixture are subjected to ultraviolet sterilization in combination. And make the separated water reusable as reusable water. Of course, in the sterilization step 6, the flow path of the raw seaweed mixed solution and the separated water are different, and the two are not mixed but subjected to ultraviolet sterilization at almost the same place.

FIG. 2 is a view showing an example of the configuration of one ultraviolet sterilizer used in the sterilization process 6, wherein (a) is a schematic plan view,
(B) is a schematic side view. In this example, in the ultraviolet sterilizer, three ultraviolet lamps 11, 12, and 13 are vertically arranged in parallel, respectively. In order to pass the raw seaweed mixed solution, the three ultraviolet lamps 11, 12, and 13 are close to the ultraviolet lamps 11, 12, and 13. Six translucent pipes 21, 22, 23, 24, 25, and 26 are vertically arranged in parallel. Each translucent pipe 2
The length direction of the lamps 1 to 26 is along the length direction of the ultraviolet lamps 11 to 13, so that the ultraviolet rays emitted from the lamps are radiated to the inside of the light transmitting pipe as efficiently as possible. These six translucent pipes 21, 22, 23, 2
4, 25, 26 are connected so as to form a serial flow path between the inlet 30 and the outlet 31. That is, entrance 3
0, the lower end of the light-transmitting pipe 21 is connected, the upper ends of the light-transmitting pipe 21 and the light-transmitting pipe 22 are connected by a curved pipe 41, and the lower ends of the light-transmitting pipe 22 and the light-transmitting pipe 23 are connected. Are connected by a curved pipe 42. Similarly, the upper ends of the pipes 23 and 24 are curved pipes 43, and the lower ends of the pipes 24 and 25 are similarly curved pipes 4.
4, the upper ends of the pipes 25 and 26 are connected to each other by a curved pipe 45, and the lower end of the last translucent pipe 26 is connected to the outlet 31.
It is connected to the.

The arrangement of the translucent pipes as viewed in a plane has a square shape like a grid, and one ultraviolet lamp 11
(Or 12) are four light-transmitting pipes 21, 22, 2
5, 26 (or 23, 24, 25, 26). With this configuration, the liquid in the four translucent pipes can be sterilized at a time with one ultraviolet lamp, so that sterilization can be performed very efficiently using a small number of ultraviolet lamps. .
Further, the translucent pipes 23 and 24 are also arranged in proximity to another ultraviolet lamp 13, and this ultraviolet lamp 13 is also used for sterilizing reuse water as described later.

From the inlet 30, a raw seaweed mixed solution pumped by a suitable pump or the like from a mixing tank (not shown) flows in, and each translucent pipe sequentially connected in series through each of the curved pipes 41 to 45. 21 to 26, and in the process, the ultraviolet lamps 11 to 1
Sterilized by UV irradiation from 3. At this time, the direction of the raw seaweed mixture flowing through the pipes is
Because the fluid is turbulent because the fluid is reversed in the vertical direction at the position of 5, the raw seaweed mixture is naturally stirred, and ultraviolet light irradiation is performed repeatedly each time the light-transmitting pipes 21 to 26 pass.
And since the direction with respect to an ultraviolet lamp changes for every translucent pipe 21-26, as a result, it can be expected to perform even and sufficient ultraviolet irradiation of a raw seaweed mixed solution, and to expect a necessary sterilization effect. Can be. The sterilized raw laver mixture flows out of the outlet 31 and is led to the sheeting step 2 via a pipe (not shown).

In order to pass water (reused water) separated from the raw seaweed in the course of the making step 2 and / or the dehydrating step 3, two light-transmitting pipes 27, 2 are provided near the ultraviolet lamp 13.
8 are vertically arranged in parallel. These two translucent pipes 27 and 28 are also connected between the inlet 32 and the outlet 33 so as to form a serial flow path. That is, the lower end of the light-transmitting pipe 27 is connected to the inlet 32,
The upper ends of the light transmitting pipe 27 and the light transmitting pipe 28 are curved pipes 4.
The lower end of the light-transmitting pipe 28 is connected to the outlet 33. These translucent pipes 27 and 28 are adjacent to the translucent pipes 23 and 24 for the raw seaweed mixed liquid, and are arranged in a grid pattern formed by the translucent pipes 21 to 26 described above. As an extension of, it is part of a similar grid-like arrangement. Thus, the four translucent pipes 23, 24, 27, 28 located at each vertex of the square of the grid
The ultraviolet lamp 13 is disposed so as to be located substantially at the center of the liquid crystal display, and one ultraviolet lamp 13 can sterilize the liquid in the four light-transmitting pipes 23, 24, 27, 28 at a time. . In addition, since the common ultraviolet lamp 13 is used for both functions of ultraviolet irradiation for sterilizing raw laver mixture and ultraviolet irradiation for sterilizing separated water (reused water), a small number of ultraviolet lamps are used. Can be used to sterilize different types of liquids very efficiently.

The water separated from the raw seaweed in the process of the sheeting step 2 and / or the dehydration step 3 is collected via a suitable piping means or the like, and is appropriately pumped by a pump or the like to be used as the reused water to be sterilized. , Into the inlet 32. The reused water is supplied to each of the translucent pipes 27,
28, and is sterilized by ultraviolet irradiation from the ultraviolet lamp 13 in the process. Therefore, also in this case, for the same reason as described above, efficient ultraviolet irradiation and the disinfection effect thereby can be obtained. Sterilized reused water exit 33
And is supplied for reuse for any purpose through piping not shown. For example, sterilized reused water can be used as washing water for washing used cages. In addition, if various restrictions such as food safety standards can be removed, there is a possibility that, if necessary, it can be circulated and reused as part of fresh water used for preparing a raw laver mixture. In addition, since the reused water has higher transparency than the raw seaweed mixture, the amount of ultraviolet irradiation for sterilization of the reused water can be smaller than that of the raw seaweed mixture. Therefore, as in the example of FIG. 2, the number of ultraviolet lamps and the number of light-transmitting pipes used for sterilization of reused water can be smaller than in the case of the raw seaweed mixture. Further, in the present invention, since the reused water is subjected to ultraviolet sterilization in two stages, ie, a raw seaweed mixed solution and a separated water, a considerable sterilizing effect can be expected. Reusability and efficiency can be increased.

It should be noted that the number and / or arrangement of the ultraviolet rays and the number and / or arrangement of the light-transmitting pipes in FIG. 2 are merely examples, and the design may be changed as appropriate. In addition, a novel and useful ultraviolet sterilizer according to the present invention as shown in FIG.
33, 27, 28, 13), the means (30, 31, 21, 26, 11, 1, 1) for sterilizing raw laver mixture
Needless to say, the apparatus may be constituted only by 2), that is, as one kind of liquid sterilizer. In this case, for example, an external irradiation type ultraviolet sterilizer as in the above example may be used for the raw seaweed mixed solution, and an internal irradiation type ultraviolet sterilizer may be used for the ultraviolet sterilization of the reused water.

Further, an ultraviolet irradiation means (30, 31, 21 to 2) for sterilizing a raw seaweed mixture as shown in FIG.
In 6, 11, 12), not all the light-transmitting pipes need to be connected completely in series. If at least some of the light-transmitting pipes are connected in series, the light-transmitting pipes may be connected in that part. The effects according to the invention can be achieved. That is, the present invention naturally includes, in its scope, a configuration in which a translucent pipe that is partially branched in parallel exists. FIG. 3 is a schematic plan view showing an example of the configuration in that case, in which a large circle indicates the arrangement of the translucent pipe, and a small circle indicates the arrangement of the ultraviolet lamp. In the figure, a first ultraviolet irradiation unit 50 for ultraviolet sterilizing a raw seaweed mixed liquid (first liquid) is arranged in parallel corresponding to four ultraviolet lamps (five including a common lamp). A path formed by connecting ten translucent pipes in series is provided in two lines in parallel. That is, the raw seaweed mixed liquid (first liquid) flowing from the inlet 30 is immediately branched into two systems of paths 51 and 52, and the ten translucent pipes connected in series in the respective paths 51 and 52. Finally, the sterilized raw seaweed mixture (first liquid) of each system merges and reaches the outlet 31. In this way, when two systems (and may be two or more systems) are used in parallel, the diameter of one translucent pipe can be reduced, so that the ultraviolet irradiation efficiency is increased and the sterilization effect is improved. Can be achieved. In the example of FIG. 3, the second ultraviolet irradiation unit 60 for sterilizing the reused water (second liquid) with ultraviolet light is provided by two ultraviolet lamps (this lamp is also used by the first ultraviolet irradiation unit 50). ) And only one system path formed by connecting four light-transmitting pipes arranged in parallel corresponding to each other in series. However, this may also be a parallel sterilization treatment of two or more systems.
In FIG. 3, the flow path of the liquid to be processed is indicated by a line, and the path drawn by a line so as to sequentially move up and down is sequentially moved through each light transmitting pipe as shown in FIG. This schematically shows that the liquid to be processed flows while reversing the direction.

The sterilization step 6 in the embodiment of FIG. 1 is not limited to an external irradiation type ultraviolet sterilization apparatus capable of simultaneously sterilizing two kinds of liquids as shown in FIG. It is also possible to use a device (for example, an internal irradiation type ultraviolet sterilizer or an ultraviolet sterilizer that sterilizes only one type of liquid). Further, a conventionally known ultraviolet sterilizer may be used. In this case, in order to enhance the sterilizing effect, the raw seaweed mixed solution is sterilized by the first ultraviolet sterilizer according to the idea of the embodiment of the present invention. Sterilized by a second UV sterilizer with natural or mechanical stirring,
Such a sterilization process may be performed.

The novel and useful external irradiation type ultraviolet sterilizer according to the present invention can be used not only in the dry laver production process but also in other fields. For example, when applied to sterilization of beverage liquids such as milk and coffee and other relatively thick liquids, an unprecedented sterilization effect can be obtained. In addition, an external irradiation type ultraviolet sterilizer that can simultaneously sterilize two types of liquids as shown in FIG. 2 may be used for sterilizing two types of liquids that are completely unrelated.

Finally, experimental data obtained by the ultraviolet sterilization method or apparatus according to the present invention will be described. In a test apparatus in which four translucent pipes are connected in series, the flow rate is 1.64 m ³ /
When the raw nori mixture of hr was irradiated with ultraviolet light at a power consumption of 0.4 kW, when the number of general bacteria per gram of the raw nori mixture flowing into the inlet was about 10 ⁴ , it flowed out of the outlet. It was confirmed that the number of general bacteria per gram of the sterilized raw laver mixture decreased to several hundreds corresponding to about 1/30 of that.

[0026]

As described above, according to the present invention, the raw seaweed mixed solution is sterilized by ultraviolet irradiation at a stage prior to the sheeting step in the dry seaweed production process, so that sterilization unevenness does not occur. It has an excellent effect that sterilization can be performed efficiently. In addition, sterilization by ultraviolet irradiation, unlike sterilization with a disinfectant or ozone, does not affect the taste and quality of the finished dried seaweed product,
It is advantageous. In addition, when the raw laver mixture is agitated in the course of ultraviolet irradiation, an excellent effect is obtained in that the raw laver mixture can be sterilized as evenly as possible.

In the sterilization step of the raw seaweed mixture,
If the water (recycled water) separated from the raw laver in the process of the paper making process or the dehydration process is also subjected to ultraviolet sterilization,
Since the raw seaweed mixture and the reused water can be sterilized together by the same sterilization technique, an excellent effect is obtained that is extremely efficient and economical. Further, since the used separated water is sterilized and can be reused as reused water, it is economical. In addition, the raw seaweed mixture and the separated water (recycled water) are introduced into one ultraviolet sterilizer by different routes, and the raw seaweed mixture and the separated water (recycled water) are introduced by the single ultraviolet sterilizer. The sterilization of water is extremely economical and has an excellent effect of taking up little space. Furthermore, in this case, if at least one ultraviolet lamp in one ultraviolet sterilizer is used in common to sterilize the raw laver mixture and the separated water (reused water), the use of the ultraviolet lamp is extremely economical. And an excellent effect of contributing to downsizing of the entire device.

Further, if at least the raw seaweed mixture is sterilized using an external irradiation type ultraviolet sterilizer, there is no obstacle in the flow path of the mixture, and the minced substance in the mixture is removed. There is an advantage that no clogging or pooling occurs, no troublesome cleaning or the like occurs, and the method is suitable for sterilizing a liquid containing a mince-like substance such as a raw seaweed mixture.
In addition, the external irradiation type ultraviolet sterilizer has a structure in which the flow paths of a plurality of translucent pipes juxtaposed close to the ultraviolet lamp are connected in series, so that the raw seaweed mixed solution is transparent. Each time it sequentially passes through the light pipe, its direction is turned upside down, and the mixture is disturbed, and the raw seaweed mixture is naturally agitated in the process of UV irradiation as described above. It has an excellent effect that ultraviolet sterilization can be performed as uniformly as possible.

Further, an external irradiation type ultraviolet sterilizer according to the present invention includes an ultraviolet lamp and a plurality of light transmitting pipes juxtaposed in juxtaposition to the ultraviolet lamp. Are connected so as to form a series, and the liquid passing through the pipe in series is characterized by being repeatedly sterilized by the ultraviolet lamp. The excellent effect that the ultraviolet sterilization can be performed as evenly as possible due to the agitation being caused. Further, since the liquid passing through the pipes connected in series is repeatedly sterilized by the ultraviolet lamp, sufficient sterilization can be performed in a compact apparatus configuration as a whole and using a small number of ultraviolet lamps. Therefore, an excellent effect of providing a new and useful external irradiation type ultraviolet sterilizer suitable for sterilizing other concentrated liquids such as a raw seaweed mixed liquid (for example, beverage liquids such as milk and coffee) can be provided. .

Further, an external irradiation type ultraviolet sterilizer according to another aspect of the present invention includes a light emitting source including at least one ultraviolet lamp and a first flow path for flowing a first liquid, A light source having at least one translucent pipe disposed proximate to at least one ultraviolet lamp, and a second flow path for flowing a second liquid, wherein at least one light source in the light source is provided. Having at least one translucent pipe disposed proximate to two ultraviolet lamps, wherein at least one ultraviolet lamp in the light emitting source is connected to the first flow path and the second flow path.
It is characterized by the fact that it is shared by the same flow path, so that two different types of liquids can be sterilized by one ultraviolet sterilizer, which is extremely economical and requires no space. To play. In addition, since at least one ultraviolet lamp is used in common to sterilize two different types of liquids, sharing the ultraviolet lamp is extremely economical and contributes to downsizing of the entire apparatus. To play. Therefore, it is possible to provide a novel and useful external irradiation type ultraviolet sterilizer suitable for efficiently sterilizing different kinds of liquids such as a raw seaweed mixed solution and reused water. To play. In this case, at least one of the first flow path and the second flow path has a plurality of translucent pipes juxtaposed close to the ultraviolet lamp, and the flow paths of the plurality of translucent pipes are connected in series. In the same manner as described above, the liquid passing through the pipe is naturally agitated, so that the ultraviolet sterilization can be performed as evenly as possible, as described above. To play.

[Brief description of the drawings]

FIG. 1 is a block diagram (or flowchart) schematically showing a dry laver production process to which a sterilization method according to one embodiment of the present invention is applied.

FIG. 2 is a view showing one embodiment of an ultraviolet sterilizer according to the present invention, showing an example of the configuration of one ultraviolet sterilizer that can be used in the sterilization step of FIG. 1, wherein (a) is a schematic plan view, b) is a schematic side view.

FIG. 3 is a schematic plan view showing another embodiment of the ultraviolet sterilizer according to the present invention, showing an example of a planar arrangement of an ultraviolet lamp and a translucent pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 The process of producing a raw seaweed mixed liquid 2 The drawing process 3 The dehydration process 4 The drying process 5 The stripping process 6 The sterilization process by ultraviolet irradiation 11,12,13 Ultraviolet lamp 21-28 Translucent pipe 30,32 Inlet 31,33 Outlet 41 to 46 Curved tube 50 First ultraviolet irradiation unit 60 Second ultraviolet irradiation unit

Claims (10)

[Claims] 1. A dry laver production process comprising at least a paper-making step of discharging a raw laver mixture onto a pond to form the raw laver into a sheet, wherein the raw laver mixture is irradiated with ultraviolet light before the laminating step. An ultraviolet sterilization method in a dry laver production process, comprising a sterilization step of sterilizing by irradiation. 2. The ultraviolet sterilization method according to claim 1, wherein in the sterilization step, the raw seaweed mixture is agitated in the course of ultraviolet irradiation. 3. The dry laver production process includes a dehydration step of dehydrating the raw laver sheeted on the pond. In the sterilization step, the raw laver is in the course of the sheeting step or the dehydration step. The ultraviolet sterilization method according to claim 1 or 2, wherein the water separated from the mixed solution is subjected to ultraviolet sterilization, and the separated water can be reused. 4. The sterilizing step, wherein the raw nori mixed solution and the separated water are separately introduced into one ultraviolet sterilizing device, and the raw nori mixed solution is introduced by the one ultraviolet sterilizing device. The method of claim 3, wherein sterilization is performed on the separated water. 5. The ultraviolet sterilization method according to claim 4, wherein at least one ultraviolet lamp in the one ultraviolet sterilizer is used to sterilize the raw seaweed mixture and the separated water, respectively. . 6. The ultraviolet sterilization method according to claim 1, wherein in the sterilization step, at least the raw seaweed mixture is sterilized using an external irradiation type ultraviolet sterilizer. 7. The external irradiation type ultraviolet sterilizer according to claim 1, wherein a plurality of translucent pipes arranged adjacent to the ultraviolet lamp are connected in series. 7. The ultraviolet sterilization method according to 6. 8. An ultraviolet lamp, comprising: a plurality of light-transmitting pipes juxtaposed in juxtaposition to the ultraviolet lamp; wherein the plurality of light-transmitting pipes are connected so as to be in series with each other;
An external irradiation type ultraviolet sterilizer, wherein a liquid passing through the pipes in series is sterilized repeatedly by the ultraviolet lamp. 9. A light emitting source including at least one ultraviolet lamp, and a first flow path for flowing a first liquid, wherein at least one light source is disposed adjacent to at least one ultraviolet lamp in the light emitting source. A light-transmitting pipe having at least one light-transmitting pipe, and a second flow path for flowing a second liquid, wherein at least one light-transmitting pipe is disposed adjacent to at least one ultraviolet lamp in the light-emitting source. An external irradiation type ultraviolet sterilizer, comprising: a device having a pipe, wherein at least one ultraviolet lamp in the light emitting source is shared by the first flow path and the second flow path. 10. A method according to claim 1, wherein at least one of said first flow path and said second flow path has a plurality of light-transmitting pipes juxtaposed in proximity to said ultraviolet lamp. The ultraviolet sterilizer according to claim 9, wherein the flow paths are connected in series.