JP2019176987A - Fluid sterilizing module - Google Patents

Abstract

To provide a fluid sterilizing module which is higher in workability, and is capable of reducing more weight and cost.SOLUTION: The fluid sterilizing module 1 includes: an ultraviolet-permeable housing 2 formed with a hollow part capable of introducing a body to be irradiated inside thereof; a light source 6 disposed on the housing 2, and emitting light toward the hollow part; and a covering part 5 covering a region of an outer periphery of the housing 2 where the light source 6 is not disposed, and formed by a sheet member composed of a thermoplastic resin fiber having an optical typical length of 10 nm or more and 500 nm or less, and having a porosity of 20% or more and 90% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid sterilization module.

  Since ultraviolet rays have a sterilizing ability, an apparatus for continuously sterilizing a fluid by irradiating the fluid such as water with ultraviolet rays has been proposed. As such an apparatus, an outer tube including a material that reflects ultraviolet light is disposed so as to surround the inner tube including a material that scatters and transmits ultraviolet light, and the outer tube that reflects ultraviolet light irradiated from the light source unit. A sterilizing apparatus is proposed that is reflected on the inner peripheral surface of the inner tube or the inner peripheral surface of the inner tube that scatters and transmits ultraviolet rays to propagate to the fluid inside the inner tube (for example, Patent Document 1). reference.).

JP 2013-158722 A

In the conventional sterilizer, a metal such as aluminum or stainless steel is used as the outer tube containing a material that reflects ultraviolet rays. Therefore, there exists a problem that workability is low. Also, from the viewpoint of weight reduction and cost, a fluid sterilization module that can achieve further weight reduction and cost reduction has been desired.
Accordingly, the present invention has been made by paying attention to the conventional unsolved problems, and provides a fluid sterilization module that is more workable and can be reduced in weight and cost. It is an object.

  A fluid sterilization module according to an embodiment of the present invention includes an ultraviolet light transmissive housing in which a hollow portion into which an irradiation target can be introduced is formed, and a light that is disposed in the housing and is directed toward the hollow portion. And a region of the outer periphery of the housing where the light source is not disposed, and is formed of thermoplastic resin fibers having an optical representative length of 10 nm or more and 500 nm or less, and a porosity of 20 % Or more and 90% or less of a sheet-like member.

  According to one embodiment of the present invention, it is possible to realize a fluid sterilization module that has higher workability and can achieve weight reduction and cost reduction.

It is a block diagram which shows an example of the fluid sterilization module which concerns on this invention. It is a block diagram which shows the other example of the fluid sterilization module which concerns on this invention. It is a block diagram which shows the other example of the fluid sterilization module which concerns on this invention. It is a block diagram which shows the other example of the fluid sterilization module which concerns on this invention. It is an example of the characteristic view which shows the relationship between ultraviolet irradiation time and a reflectance.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

FIG. 1 is an external view showing an example of a fluid sterilization module 1 according to the present invention, wherein (a) is a cross-sectional view taken along the line AA ′ of (b), (b) is a vertical cross-sectional view, and (c) is a cross-sectional view. It is BB 'sectional view taken on the line of (b).
As shown in FIG. 1, a fluid sterilization module 1 includes an inflow side wetted part 3 having a cylindrical case 2 having both ends opened and an inlet 2 in of, for example, a fluid case 2 as an irradiated body. And an outflow side wetted part 4 having a fluid outlet 2out from the casing 2, a covering part 5 disposed so as to cover the outer periphery of the casing 2, and a light source 6 for irradiating ultraviolet rays. In FIG. 1, the upper side is the inflow side and the lower side is the outflow side. However, the present invention is not limited to this, and the lower side may be the inflow side and the upper side may be the outflow side.

  The housing 2 is a cylindrical member formed of an ultraviolet light transmissive material, and a fluid is introduced as an irradiated body into a hollow portion inside the cylindrical shape. The term “ultraviolet light transmission” as used herein refers to a material having an ultraviolet transmittance of 200 nm or more and 300 nm or less of 50% or more, and preferably a material of 80% or more. The UV transmittance is defined not by the transmittance standardized at a certain thickness but by the transmittance when the transmittance of the wall material itself formed of a highly transmissive material is measured. The measurement is performed using, for example, an ultraviolet-visible absorption spectrophotometer. As the ultraviolet transmissive material, for example, an ultraviolet transmissive resin or quartz can be applied, and quartz is preferable, and the housing 2 is formed of, for example, a quartz tube. As quartz, fused quartz, synthetic quartz, or the like can be applied.

  The inflow side liquid contact part 3 has a cylindrical part 3a that forms a hole to be an inflow port 2in, and a flange part 3b is formed on the outer peripheral surface on the upper end side of the cylindrical part 3a. The outer diameter of the flange portion 3 b is the same as the outer diameter of the covering portion 5. The outer diameter of the cylindrical portion 3 a is the same as the inner diameter of the housing 2. The cylindrical portion 3a is inserted into the housing 2, and the inside of the housing 2 is kept watertight by bringing the flange portion 3b and the ends of the housing 2 and the covering portion 5 into close contact with, for example, an adhesive resin.

The outflow side liquid contact part 4 includes a cylindrical part 4a and a columnar part 4b having an outer diameter smaller than that of the cylindrical part 4a. A flange portion 4 a ′ is formed on the outer peripheral surface on the lower end side of the cylindrical portion 4 a, and the outer diameter of the flange portion 4 a ′ is the same as the outer diameter of the covering portion 5. The outer diameter of the cylindrical portion 4 a is the same as the inner diameter of the housing 2. In the cylindrical part 4b, a space for installing the light source 6 is formed in the center part of the surface facing the hollow part of the housing 2. The inner peripheral side portion of the cylindrical portion 4a and the outer peripheral side portion of the columnar portion 4b are integrally connected to each other by being connected by a plate-like member 4c facing in the radial direction at two locations separated by, for example, 180 ° in the circumferential direction. It has become. And the cylindrical part 4a is inserted in the housing | casing 2, The flange part 4a 'and the edge part of the housing | casing 2 and the coating | coated part 5 are closely_contact | adhered with adhesive resin, for example, and the inside of the housing | casing 2 is kept watertight. ing.
And the annular space part formed between the inner peripheral side part of the cylindrical part 4a of the outflow side liquid-contact part 4 and the outer peripheral side part of the cylindrical part 4b forms the outflow port 2out.

  The inflow side liquid contact part 3 and the outflow side liquid contact part 4 are made of, for example, stainless steel (SUS). In addition, the material of the inflow side liquid-contact part 3 and the outflow side liquid-contact part 4 is not limited, For example, it can select according to the property of a to-be-irradiated body. For example, when handling fluids related to food production, chemical production, etc., specifically, for example, pure water, sanitary stainless steel may be used. If the inflow side wetted part 3 and the outflow side wetted part 4 are made of resin, it can be realized at low cost, and if a highly reflective resin or metal is used, the light from the light source can be reflected efficiently. Yes, it is possible to irradiate the internal fluid with light efficiently. Moreover, if it forms with metals with high heat conductivity, such as aluminum, heat dissipation can be improved. The inflow side liquid contact part 3 and the outflow side liquid contact part 4 may be entirely composed of one material, or a plurality of materials may be used in combination. For example, a resin, preferably a highly reflective resin, is used for the inflow side wetted part 3 where the light source 6 is not provided, and aluminum or stainless steel is used for the outflow side wetted part 4 where the light source 6 is provided. May be used.

Furthermore, the adhesive used for bonding is not limited to the adhesive resin, and may be wetted with a pipe sealing material or the like, and it is preferable to use an adhesive that does not impair the watertightness inside.
The coating | coated part 5 is formed with the sheet-like member formed with the fiber made from a thermoplastic resin. The fiber made of a thermoplastic resin preferably has an optical representative length of 10 nm to 1000 nm in order to cause Mie scattering. The optical representative length is more preferably 50 nm or more and 500 nm or less, and further preferably 100 nm or more and 400 nm or less.
In addition, the sheet-like member preferably has a porosity of 20% or more and 90% or less from the viewpoint of a balance between ultraviolet transmittance and handleability. The porosity is more preferably 70% or more and 90% or less, and further preferably 80% or more and 90% or less. The higher the porosity, the more the fiber boundary surface that reflects the light by utilizing the three-dimensional structure of the sheet-like member, so that the reflectance is improved.

Here, among the members forming the sheet-like member, that is, the microstructure of the fibers made of thermoplastic resin, the number average length of the shortest distance of the continuum is defined as the optical representative length.
The optical representative length is, for example, the number average diameter of the sphere when the continuum is formed of a sphere, and the number average diameter of the fiber when the continuum is formed of a fiber. In the case of being formed of an object, the number average of the minor axis is the optical representative length.
Moreover, it is preferable that the number average fiber diameter of the fiber made from a thermoplastic resin is 10 nm or more and 1000 nm or less. The number average fiber diameter is more preferably 50 nm or more and 500 nm or less, and further preferably 100 nm or more and 400 nm or less.

The sheet-like member preferably has a basis weight of 10 g / m ² or more and 50 g / m ² or less, a thickness of 50 μm or more and 150 μm or less, and a maximum pore diameter of 3 μm or less.
If the basis weight is 10 g / m ² or more, the fiber is not broken when the fluid sterilization module is manufactured, and if it is 50 g / m ² or less, the optical characteristics are higher.
When the basis weight is light or there is no thickness, there is a possibility that the ultraviolet rays pass through the covering portion 5, that is, the sheet-like member, and deteriorate the members provided on the outer periphery of the covering portion 5. Further, if the basis weight is too heavy or the thickness is too large, a manufacturing load is imposed. Therefore, transmission of ultraviolet rays is prevented by adjusting the number of sheets wound around the outer periphery of the housing 2 by using a sheet-like member formed of thermoplastic resin fibers having a certain basis weight and thickness. If the number of sheet-like members wound around the housing 2 is small, the manufacturing is simple, and if the number is large, the distribution of through-holes and unevenness of the through-holes of the covering portion 5 formed of fibers made of thermoplastic resin are reduced. be able to.

A number average fiber diameter is calculated | required using a scanning electron microscope (SEM) (for example, JEOL Co., Ltd. make, apparatus model: JSM-6510).
For example, a sheet-like non-woven fabric formed of fibers made of thermoplastic resin is cut into a size of 10 cm × 10 cm, and the surface facing the non-woven fabric is sandwiched between two iron plates at 60 ° C. After pressing for 90 seconds at a pressure of platinum, platinum is deposited on the nonwoven fabric.
And using SEM, it image | photographs on the conditions of acceleration voltage 15kV and working distance 21mm. The photographing magnification is, for example, 10,000 times for yarns having an average fiber diameter of less than 0.5 μm and 6000 times for yarns having an average fiber diameter of 0.5 μm or more and less than 1.5 μm. The field of view at each magnification is, for example, 12.7 μm × 9.3 μm at 10,000 ×, 21.1 μm × 15.9 μm at 6000 ×, and 31.7 μm × 23.9 μm at 4000 ×. 100 or more fibers are randomly photographed, all fiber diameters are measured, and the average fiber diameter is obtained based on this. At this time, the fibers fused in the yarn length direction are omitted from the measurement target.

When Ni fibers having a fiber diameter Di are present, the number average fiber diameter Dn is obtained from the following equation (1). Xi represents the abundance ratio of the fiber diameter Di, and is represented by Xi = Ni / ΣNi.
Dn = (ΣXi) × Di = Σ (Ni × Di) / Σ (Ni) (1)
For the maximum pore size of the sheet-like member formed of thermoplastic resin fibers, a porous material automatic pore size distribution measurement system (for example, Porous Materials, Inc., device type: Automated Perm Porometer) is used. A sample of a sheet-like member such as a nonwoven fabric is cut to a diameter of 25 mm with a punching blade, immersed in a GALWICK reagent solution, and deaerated for 1 hour. Thereafter, the sample is cut and air pressure is applied. Since the GALWICK reagent overcomes the liquid surface tension in the capillary and is pushed out, the pore diameter is obtained by the Washburn equation derived from the capillary equation by measuring the pressure at that time, and the maximum pore diameter is determined by the bubble point (kPa). Ask.

The basis weight of the sheet-like member formed of thermoplastic resin fibers is measured according to JIS-L-1906.
For example, when using a nonwoven fabric as a sheet-like member, except for 10 cm at both ends of the nonwoven fabric, three samples having a length of 20 cm and a width of 20 cm are cut out, the mass is measured, and the average value is converted into a mass per unit area. Is calculated.
The thickness of the sheet-like member formed of thermoplastic resin fibers is a nonwoven fabric as a sheet-like member under a load of 40 g under a measurement area of 4 cm ² using a compression elasticity tester (for example, E-2 type). The thickness (mm) is measured.
The porosity of the sheet-like member formed of thermoplastic resin fibers is determined by the volume of only the material constituting the sample, that is, the density of the thermoplastic resin fibers and the material constituting the sample calculated from the basis weight (see FIG. The apparent volume (B) obtained by multiplying A) and the thickness of the sheet-like member by the area of the sample is determined. Then, the porosity is calculated from the following equation (2) based on the volumes (A) and (B).
Porosity (%) = {1- (A / B)} × 100 (2)

  The thermoplastic resin forming the sheet-like member is preferably a resin in which 99% or more in terms of molecular weight is formed with a single bond main chain. When the thermoplastic resin is formed of a resin with multiple bonds, a resin formed of a single bond main chain is preferable in order to absorb ultraviolet light. Further, the thermoplastic resin may contain an organic compound having no multiple bond of 1% or more in terms of molecular weight as an additive. Because most of the bonds that form thermoplastic resins are single bonds, they can exhibit low deep UV absorption ability, and deep UV reflection ability that cannot be achieved with sheet-like members made of ordinary polymers And deep UV durability. In addition, it is possible to extend the life of the fluid sterilization module by using a thermoplastic resin containing an additive that absorbs deep ultraviolet rays and generates radicals and contains only a trace amount of carbon-based multiple bonds. it can.

Furthermore, it is preferable that the hole diameter distribution of the sheet-like member formed of fibers made of thermoplastic resin satisfies the following expressions (3) and (4).
Dmax / Dave <2.00 (3)
Dmax / Dmin <3.50 (4)
In formulas (3) and (4), Dmax represents the maximum pore size (μm), Dave represents the average pore size (μm), and Dmin represents the minimum pore size (μm).
The pore size distribution is preferably Dmax / Dave <2.00, more preferably Dmax / Dave <1.75, and further preferably Dmax / Dave <1.50. Here, Dmax / Dave = 1 is a pore size distribution in an ideal state where the pore sizes composed of fibers constituting the nonwoven fabric are theoretically the same. By setting Dmax / Dave <2.00, the reflection performance can be made uniform.

As the thermoplastic resin, polyolefin, polycycloolefin, fluorine-based resin, and chlorine-based resin can be applied, and these can be applied singly or in a mixture or a copolymer containing them. Is preferred.
Examples of the polyolefin-based resin include a high-pressure low-density polyethylene which is a homopolymer or copolymer of an α-olefin such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene. , Linear low density polyethylene (LLDPE), high density polyethylene, polypropylene (propylene homopolymer), polypropylene random copolymer, poly 1-butene, poly 4-methyl-1-pentene, ethylene / propylene random copolymer, Examples thereof include ethylene-1-butene random copolymers and propylene-1-butene random copolymers.

Examples of the fluorine-based resin include polytetrafluoroethylene, perfluoroalkoxyalkane, polyvinyl fluoride, and polyvinylidene fluoride.
Examples of the chlorine-based resin include polyvinyl chloride, polyvinylidene chloride, and polychlorotrifluoroethylene.
The sheet-like member may be any of a woven fabric, a knitted fabric, and a non-woven fabric, but a non-woven fabric is preferred from the viewpoint of easy fulfillment of optical length and porosity.
As the nonwoven fabric, nonwoven fabrics produced in various shapes and various production methods can be used, but the pore diameter is dense and uniform formed by ultrafine fibers, which is higher than nonwoven fabrics used for other purposes. A non-woven fabric having a specific surface area is preferred. A melt-blown nonwoven fabric is mentioned as a nonwoven fabric formed of ultrafine fibers.

  By using the meltblown nonwoven fabric, the pore diameter formed by the continuous long fibers becomes dense and uniform, and furthermore, a sheet-like member formed of ultrafine fibers can be obtained while having a high porosity unique to the meltblown nonwoven fabric. When a non-woven fabric having a predetermined optical length is produced by the melt blown method, a sheet-like member containing a structure having a size capable of Mie scattering of light in the ultraviolet region can be obtained. For this reason, even in the near-ultraviolet region that easily absorbs general organic matter and causes material deterioration, it has a very high reflectivity of 90% or more, and most of the organic matter absorbs deep UV light that causes material deterioration. Even in the region, high deep ultraviolet reflectivity due to Mie scattering can be exhibited.

The melt blown nonwoven fabric is produced by the following procedure.
First, ultrafine yarn obtained by pulling a thermoplastic resin having spinnability with a high-temperature and high-speed gas is randomly accumulated on a conveyor to form a nonwoven fabric. Unprecedented high filter whose pore diameter is extremely dense and uniform by making the suction net speed on the collection net uniform by densifying the collection net on the conveyor and suppressing local entanglement and overlap between fibers. A nonwoven fabric having performance can be obtained.
When the sheet-like member is formed of a nonwoven fabric, the formation index is preferably 125 or less when the basis weight of the nonwoven fabric is 10 g / m ² or more and 50 g / m ² or less. More preferably, it is 100 or less, More preferably, it is 75 or less. The smaller the formation index, the finer the pore size distribution and the smaller the maximum pore size, and the reflectance is improved.

The formation index is measured using a transmission type ground total (for example, device type: FMT-MIII, manufactured by Nomura Corporation). First, with the sample not set, the amount of transmitted light when the light source is turned on / off is measured with a CCD camera. Then, the amount of transmitted light is measured in the same manner with a non-woven fabric cut into A4 size, and the average transmitted light is measured. The rate, average absorbance, and standard deviation (absorbance variation) are determined. The formation index can be obtained by standard deviation ÷ average absorbance × 10. The formation index is smaller when the formation is better, and is larger when the formation is worse.
In addition, the coating | coated part 5 may be provided in the outer peripheral whole surface of the housing | casing 2, as shown in FIG. 1, and may be provided partially. It is preferable that the covering portion 5 is provided at a position where at least ultraviolet rays emitted from the light source 6 are directly irradiated.

Although not shown in FIG. 1, the outer periphery of the covering portion 5 is fixed with a material having low ultraviolet transmittance for fixing after winding a sheet-like member formed of thermoplastic resin fibers. May be. It is possible to prevent slight ultraviolet rays that pass through the sheet-like member from leaking to the outer periphery of the covering portion 5. For example, the covering 5 may be fixed with a heat shrinkable tube.
The light source 6 is disposed in a space for the light source 6 in the outflow side liquid contact part 4. Specifically, the light source 6 is arranged in the space of the outflow side liquid contact part 4 so that the irradiation surface faces the hollow part of the housing 2. In the space for the light source 6, for example, a window portion made of a light transmissive member is formed. Thereby, light is irradiated toward the hollow part of the housing 2. The light source 6 has an emission wavelength peak of 200 nm or more and 300 nm or less, and is formed of, for example, a light emitting diode (LED).

  In addition, although the case where a fluid is applied as an irradiated object is described here, it is only necessary to have fluidity, and a powder composed of a large number of fine particles or particles such as liquid, ice and sand. It may be a body. Specific examples of liquids include fluids such as water, aqueous solutions, and emulsions, and include liquids used for food and drink or non-beverages. Examples of the liquid for eating and drinking include water, soft drinks, dairy drinks, milk, and edible oils. Also included are sorbets, jellies, soft creams, smoothies, cocoa or chocolate drinks. Non-food liquids include, for example, ultrapure water, washing water, weakly acidic water, weakly alkaline water and the like, and industrial products such as aqueous solutions of industrial raw materials and water-based paints.

  As described above, the fluid sterilization module 1 according to an embodiment of the present invention is a thermoplastic resin in which the casing 2 is formed of a material having high permeability to ultraviolet rays and the covering portion 5 can cause Mie scattering. Since it is made of a fiber made of fiber and has a high reflectance in the near ultraviolet region and the deep ultraviolet region, it is possible to avoid leakage of ultraviolet rays to the outside of the covering portion 5. The fiber made of thermoplastic resin is cheaper and lighter than metal, so it is low in comparison with the case where a metal such as aluminum or stainless steel is provided as a member for avoiding leakage of ultraviolet rays to the outside. Cost reduction and weight reduction can be achieved. Moreover, since the coating | coated part 5 should just be formed by winding a sheet-like member around the outer periphery of the housing | casing 2, a simpler fluid sterilization module can be provided.

In the above embodiment, the case where one light source 6 is provided has been described. However, the number of light sources 6 is not limited to one, and the number is not limited as long as the irradiated object can be sterilized. As the number of the light sources 6 is increased, the sterilization efficiency is improved. However, if the number is too large, it is necessary to consider heat dissipation, and much power is consumed. Moreover, it is preferable to arrange | position the light source 6 in the position which can irradiate with respect to the housing | casing 2 symmetrically.
For example, when four light sources 6 are provided, as shown in FIG. 2, in the fluid sterilization module 1 shown in FIG. 1, in place of the outflow side wetted part 4, the outflow side wetted liquid having an outlet 2out at the center. Part 11 is used.

  As shown in FIG. 2, the outflow side wetted part 11 has a cylindrical structure with a hole serving as the outflow port 2out at the center, as in the inflow side wetted part 3, and the lower end of the cylindrical part 11a. A flange portion 11b is formed on the side outer peripheral surface. The outer diameter of the flange portion 11 b is the same as the outer diameter of the covering portion 5. The outer diameter of the cylindrical portion 11 a is the same as the inner diameter of the housing 2. And the cylindrical part 11a is inserted in the housing | casing 2, and the inside of the housing | casing 2 is kept watertight by closely_contact | adhering the flange part 11b and the edge part of the housing | casing 2 and the coating | coated part 5 with adhesive resin, for example. . The four light sources 6 are arranged on the end surface on the upper end side of the outflow side wetted part 11 so as to face the hollow part of the housing 2 so as to be pointed.

Further, for example, when two light sources 6 are provided on the side surface of the fluid sterilization module 1, as shown in FIG. 3, in the fluid sterilization module 1 shown in FIG. The two light sources 6 are arranged so as to face each other in the vicinity of the central portion of the casing 2 in the longitudinal direction. At this time, the covering portion 5 is not provided at the arrangement position of the light source 6, and the irradiation surface of the light source 6 and the outer peripheral surface of the housing 2 are arranged to face each other. As a result, it is possible to irradiate the irradiated object flowing inside the housing 2 without the irradiation light of the light source 6 being blocked by the covering portion 5.
Moreover, as shown in FIGS. 1-3, the fluid sterilization module 1 which concerns on one Embodiment of this invention inserts the inflow side liquid-contact part 3 and the outflow side liquid-contact part 4 in the edge part of the housing | casing 2, respectively. The case of bonding using an adhesive has been described, but the present invention is not limited to this.

  For example, instead of the inflow side wetted part 3, as shown in FIG. 4, a disc-shaped inflow side in which the outer diameter is larger than the outer diameter of the covering part 5 and a hole serving as an inflow port 2 in is formed in the central part. A liquid contact portion 21 is provided. Similarly, instead of the outflow side liquid contact part 4, a disc-shaped outflow side liquid contact part 22 having an outer diameter larger than the outer diameter of the covering part 5 and having an annular outflow port 2out is provided. In the state where the casing 2 and the covering portion 5 are sandwiched between the inflow side wetted part 21 and the outflow side wetted part 22, in the vicinity of the edge of the inflow side wetted part 21 and the outflow side wetted part 22. 4 to 8 places that are spaced apart at equal intervals in the circumferential direction are sandwiched by bolt screws 23, and at this time, the end of the housing 2 is tightened with packing or the like, so that the inflow side wetted part 21 and the outflow side The liquid contact part 22, the housing 2 and the covering part 5 may be fixed.

In addition, the outflow side liquid contact part 22 is a disk-shaped member, and the remaining cylindrical columnar diameter part 22a and annular large diameter part 22b are removed from the outflow in FIG. Similarly to the side liquid contact part 4, the two parts are formed integrally with each other by being connected by a plate-like member 22 c facing in the radial direction at two places, for example, 180 ° apart in the circumferential direction.
2 to 4, (a) is a sectional view taken along line AA ′ of (b), (b) is a longitudinal sectional view, and (c) is a sectional view taken along line BB ′ of (b). It is. 2 to 4, the upper side is the inflow side and the lower side is the outflow side. However, the present invention is not limited to this, and the lower side may be the inflow side and the upper side may be the outflow side.

Moreover, in the said embodiment, you may provide the light source 6 in the inflow side liquid-contact part 3, Outflow side liquid-contact part 3 or 21, Outflow side liquid-contact part 4 or 11 or 22, Out of the outer periphery of the coating | coated part 5 At least one of them may be provided.
The fluid sterilization module 1 shown in FIGS. 1 to 4 includes, for example, a melt-blown nonwoven fabric 3 as a covering portion 5 formed on a casing 2 formed of a quartz tube having an inner diameter φ of 50 mm, an outer diameter φ of 54 mm, and a length of 100 mm. It is formed by wrapping around. In addition, the fluid sterilization module 1 having one light source 6 shown in FIGS. 1 and 4 has, for example, a diameter φ of the inlet 2 in of 10 mm, an outer diameter φ of the outlet 2 out of 34 mm, and an inner diameter φ of the outlet 2 out of 26 mm. Set to In the fluid sterilization module 1 including the plurality of light sources 6 shown in FIGS. 2 and 3, for example, the diameter φ of the inlet 2in and the outlet 2out is set to 10 mm.

[Example 1]
A polypropylene resin having a melt flow rate of 1600 g / 10 min was used to prepare a melt blown nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 110 μm. The fiber diameter and the ultraviolet reflectance (240 nm or more and 350 nm or less) at this time are as shown in Table 1.

[Example 2]
A nylon 6 resin having a melt flow rate of 1600 g / 10 min was used to prepare a melt blown nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 102 μm. The fiber diameter and ultraviolet reflectance (240 nm or more and 350 nm or less) at this time are as shown in Table 2.

[Example 3]
FIG. 5 shows the relationship between the ultraviolet irradiation time and the reflectance of the melt blown nonwoven fabric using each resin having a fiber diameter of 0.4 μm in Example 1 and Example 2. In FIG. 5, the horizontal axis represents the ultraviolet irradiation time (min), and the vertical axis represents the reflectance (%). In FIG. 5, the symbol “◯” indicates a case where a melt blown nonwoven fabric is manufactured using polypropylene resin, and the symbol “×” indicates a case where a melt blown nonwoven fabric is manufactured using nylon 6 resin. In FIG. 5, the reflectance is 100% when the irradiation time is “0”.

Here, it can be seen from Tables 1 and 2 that a relatively high reflectance can be obtained when the fiber diameter is 0.1 μm or more and 1.0 μm or less. That is, it can be seen that the higher the reflectivity, the more efficiently the ultraviolet light can be used, so that high sterilization efficiency can be obtained. However, as shown in FIG. 5, the polypropylene resin having no multiple bond has a reflectance of about 100% even when irradiated with ultraviolet rays for a long time. On the other hand, the reflectivity of the nylon 6 resin having multiple bonds decreases as the ultraviolet irradiation time becomes longer.
Therefore, it is confirmed that a melt blown nonwoven fabric made of resin fibers having a fiber diameter of 0.1 μm or more and 1.0 μm or less, such as polypropylene resin, is suitable for a sheet-like member. It was done.

  As mentioned above, although embodiment of this invention was described, the said embodiment has illustrated the apparatus and method for materializing the technical idea of this invention, and the technical idea of this invention is a component. It does not specify the material, shape, structure, arrangement, etc. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

DESCRIPTION OF SYMBOLS 1 Fluid sterilization module 2 Case 2in Inlet 2out Outlet 3,21 Inflow side wetted part 4,11,22 Outflow side wetted part 5 Covering part 6 Light source

Claims (7)

A UV-transmitting casing in which a hollow part into which an irradiated body can be introduced is formed;
A light source disposed in the housing and irradiating light toward the hollow portion;
The outer periphery of the casing is covered with a region where the light source is not disposed, is formed of a thermoplastic resin fiber having an optical representative length of 10 nm or more and 1000 nm or less, and a porosity is 20% or more and 90% or less. A sheet-like member;
A fluid sterilization module comprising:   2. The fluid sterilization module according to claim 1, wherein a material of the casing is any one of quartz glass, an ultraviolet transmissive fluororesin, and an ultraviolet transmissive polycycloolefin.   The fluid sterilization module according to claim 1 or 2, wherein 99% or more of the thermoplastic resin is formed of a single bond main chain in terms of molecular weight.   The fluid sterilization module according to any one of claims 1 to 3, wherein the thermoplastic resin contains an organic compound having no multiple bond of 1% or more in terms of molecular weight as an additive. The thermoplastic resin fibers have a number average fiber diameter of 10 nm or more and 1000 nm or less, the sheet-like member has a basis weight of 10 g / m ² or more and 50 g / m ² or less, a thickness of 50 μm or more and 150 μm or less, and a maximum The fluid sterilization module according to any one of claims 1 to 4, wherein the pore diameter is 3 µm or less.   The thermoplastic resin is polyolefin, polycycloolefin, polytetrafluoroethylene, perfluoroalkoxyalkane, polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, polychlorotrifluoroethylene, and co-polymer containing these. The fluid sterilization module according to any one of claims 1 to 5, wherein the fluid sterilization module is any one of a combination.   The fluid sterilization module according to any one of claims 1 to 6, wherein the irradiated object is a fluid or liquid substance having fluidity.

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