WO2019188627A1

WO2019188627A1 - Molded activated-carbon cartridge and manufacturing method therefor

Info

Publication number: WO2019188627A1
Application number: PCT/JP2019/011615
Authority: WO
Inventors: 小澤　稔; 寛和弘瀬; 馬場　玲子
Original assignee: 東レ株式会社
Priority date: 2018-03-28
Filing date: 2019-03-19
Publication date: 2019-10-03
Also published as: TW201941920A; JPWO2019188627A1; CN111902367A

Abstract

The purpose of the present invention is to provide a molded activated carbon cartridge that is not damaged by water pressure even if water passes through the molded activated carbon cartridge from the inner circumferential side to the outer circumferential side thereof. This molded activated carbon cartridge includes a cylindrical molded activated carbon containing an activated carbon and a fibrous binder, and a packaging material that is wrapped around the outer circumference of the molded activated carbon, wherein the pressure resistance when water passes through the molded activated carbon and the packaging material toward the outside of the molded activated carbon cartridge from a space inside the molded activated carbon cartridge is equal to or greater than 0.1 MPa.

Description

Molded activated carbon cartridge and manufacturing method thereof

The present invention relates to a molded activated carbon cartridge used for a filter for water treatment and a method for producing the same.

A technique for forming a molded body using activated carbon and a fibrous binder as a filter medium for water treatment is known. For example, Patent Document 1 discloses a method of manufacturing a cylindrical shaped adsorbent by sucking a slurry containing a fibrous binder and activated carbon. Patent Document 2 discloses a method of suppressing the pressure loss of the molded adsorbent by adjusting the degree of fibrillation of the fibrous binder. Patent Document 3 discloses an adsorption filter having a specific particle size distribution of activated carbon, which is less likely to clog and has a low resistance.

Molded activated carbon is known to have a cylindrical shape because it can be produced by using a mold as a core, sucking a liquid containing activated carbon and a fibrous binder, and depositing activated carbon on the mold. By passing water from the outer circumference side to the inner circumference side of the cylindrical shaped activated carbon, or by passing water in the opposite direction, water is passed in the radial direction of the activated carbon, which has the advantage of suppressing pressure loss. .

Japanese Unexamined Patent Publication No. 2011-255310 Japanese Unexamined Patent Publication No. 2015-112518 International Publication No. 2016/080240

When flowing water through a cylindrical shaped activated carbon, a load may be applied to the shaped activated carbon due to the resistance to water flow in the radial direction, and cracking or crushing may occur. In that case, water drifts at the cracked or crushed portions of the molded activated carbon, and the desired filtration performance cannot be obtained.

When water is passed from the outer peripheral side to the inner peripheral side of the molded activated carbon, the pressure resistance can be imparted relatively easily by increasing the strength of the molding die as the core. On the other hand, because of the design of the flow path of the container containing the molded activated carbon, water may be passed from the inner circumference side to the outer circumference of the molded activated carbon. In that case, there is no supporting member, so a load due to water pressure is applied. In some cases, cracking of the formed activated carbon is difficult to avoid.

Patent Document 2 discloses that the outer peripheral surface of molded activated carbon is covered with a nonwoven fabric, but there is no disclosure regarding the conditions and pressure resistance. Moreover, only water passing from the outer peripheral side toward the inner peripheral side is disclosed.

Patent Document 3 discloses an adsorbent molded body having excellent crushing strength by removing fine powder of activated carbon, but the disclosed crushing strength is only pressure resistance when pressure is applied from the outside of the filter medium. .

Thus, even when water is passed from the inside to the outside, a cylindrical shaped activated carbon having sufficient pressure resistance that does not break has not been found.

(1) The molded activated carbon cartridge of the present invention that solves the above problems is
A cylindrical shaped activated carbon containing activated carbon and a fibrous binder;
A molded activated carbon cartridge comprising a packaging material wound around the outer periphery of the molded activated carbon,
The pressure resistance when water is passed from the space inside the molded activated carbon cartridge to the outside of the molded activated carbon cartridge through the molded activated carbon and the packaging material is 0.1 MPa or more.

The molded activated carbon cartridge of the present invention preferably satisfies at least one of the following (2) to (4).
(2) The elastic modulus of the packaging material is 0.8 MPa or more.
(3) The packaging material is a nonwoven fabric.
(4) The fiber which comprises the said nonwoven fabric is a core-sheath-type composite fiber.

(5) One of the methods for producing the molded activated carbon cartridge of the present invention that solves the above problem is that the outer periphery of the cylindrical molded activated carbon containing the activated carbon and the fibrous binder has a packaging material of 2.0 gf / mm in the circumferential direction. This is a manufacturing method of winding while applying the above tension.

(1) According to the present invention, it is possible to provide a molded activated carbon cartridge that is not damaged by water pressure even when water is passed from the inner circumference side to the outer circumference side of the molded activated carbon cartridge.
(2) Further, when the elastic modulus of the packaging material wound around the molded activated carbon is 0.8 MPa or more, sufficient pressure resistance can be provided by packaging the packaging material once around the cylindrical molded activated carbon.
(3) Moreover, when the packaging material wound around the molded activated carbon is a non-woven fabric, water resistance is suppressed, and a compact and inexpensive molded activated carbon cartridge can be obtained.
(4) Moreover, when the fiber which comprises a nonwoven fabric is a core-sheath-type composite fiber, when a nonwoven fabric is packaged around a shaping | molding activated carbon, a nonwoven fabric will be easily adhere | attached and fixed by heat.
(5) A molded activated carbon cartridge having sufficient pressure resistance can be stably manufactured by winding the packaging material wound around the molded activated carbon while applying a tension of 2.0 gf / mm or more.

Embodiments of the present invention will be described with specific examples. In addition, this invention is not limited to embodiment shown below, You may change within the range which can achieve the objective of the said invention.

The molded activated carbon cartridge of the present invention includes a molded activated carbon containing activated carbon and a fibrous binder, and a packaging material for packaging the outer periphery of the molded activated carbon. From the viewpoint of filtration performance, the mass ratio of the activated carbon in the molded activated carbon is preferably 80% by mass or more, and more preferably 90% by mass or more and 98% by mass or less. If the proportion of the activated carbon is reduced and the proportion of the fibrous binder described later is 20% by mass or more, the strength of the molded activated carbon increases. However, the proportion of the activated carbon decreases accordingly, and the filtration performance may deteriorate.

As the activated carbon, fibrous activated carbon, granular activated carbon, and powdered activated carbon can be used. Among these, activated carbon may be used alone, or two or more kinds of activated carbon may be mixed at an arbitrary ratio. The fibrous activated carbon can be selected from those based on phenol, pitch, PAN (Polyacrylonitrile), or cellulose. Fibrous activated carbon having a specific surface area of 1000 to 2500 m ² / g can be used, and has a feature that its adsorption rate is faster than that of granular activated carbon and powdered activated carbon, and pressure loss when water is passed is low. In the case of granular activated carbon and powdered activated carbon, those using coconut shell, wood, coal, synthetic resin, etc. as raw materials can be used, and the volume-based center particle size is preferably 30 μm or more and 200 μm or less. The smaller the central particle size, the higher the efficiency of contact with water, and the filtration performance improves. However, the smaller the particle size, the smaller the voids, and thus the pressure loss during water passage increases. Antibacterial properties can be imparted to the molded activated carbon cartridge by using activated carbon to which metal having antibacterial properties such as silver, copper and zinc is attached.
The volume-based center particle diameter is a particle diameter obtained by using a laser diffraction / scattering particle size distribution measuring apparatus and having a particle diameter of 50% in the volume-based cumulative particle size distribution.

The mass ratio of the fibrous binder in the molded activated carbon is preferably less than 20 mass%, more preferably 2 mass% or more and 10 mass% or less. As the fibrous binder, if it is a fibrillated fiber, it is entangled with activated carbon and bonded to form a molded body, and examples thereof include acrylic fiber, cellulose fiber, aramid fiber, and nylon fiber. Or it can be used by mixing.

In addition to the activated carbon and the fibrous binder, the molded activated carbon can contain a metal ion removing material. By including aluminosilicate, titanium silicate, titanium oxide, ion exchange fiber, etc. as the removal material, a molded activated carbon cartridge having the ability to remove harmful metal ions such as lead ions can be obtained. In order not to reduce the ratio of the activated carbon in the molded activated carbon, the mass ratio of the removing material in the molded activated carbon is preferably less than 20 mass%, more preferably 10 mass% or less.

The packaging material wound around the outer periphery of the molded activated carbon supports the molded activated carbon when water flows from the inner periphery side to the outer periphery side, and plays a role of preventing breakage such as cracks. And the removal capability of the free residual chlorine etc. which are contained in a tap water can be maintained now by preventing damage, such as a crack of shaping | molding activated carbon. If the pressure resistance of the molded activated carbon cartridge is 0.1 MPa or more, the strength is sufficient when used at tap water pressure. The upper limit of pressure resistance is not particularly limited, but is preferably 1.0 MPa or less from the viewpoint of the cost of the packaging material and the simplicity of the packaging method.

The pressure-resistant performance pressure in the present invention does not indicate the pressure of water to be supplied, but indicates the difference in pressure between the raw water side and the filtrate water side of the cylindrical shaped activated carbon. That is, it is a numerical value corresponding to the pressure loss of the molded activated carbon cartridge during water flow. Further, in the present invention, it is determined that the pressure resistance performance equal to or higher than the set pressure is satisfied because the molded activated carbon portion of the molded activated carbon cartridge is not damaged in a pressure resistance test in which a set pressure is repeatedly applied 3650 times described later. 3650 times is a method simulating actual use in which filtration with a molded activated carbon cartridge 10 times a day is carried out for one year. That is, in the present invention, “pressure resistance is 0.1 MPa or more” means that the molded activated carbon portion of the molded activated carbon cartridge is not damaged in a pressure test in which a pressure of 0.1 MPa is applied 3650 times, which will be described later.

The packaging material is not particularly limited as long as it has water permeability and can physically support the molded activated carbon. Examples include a mesh cloth, a cylindrical resin having an opening, a porous film, and a nonwoven fabric. Among these, non-woven fabrics are preferable from the viewpoint of ease of packaging and cost.

The packaging material preferably has an elastic modulus in a tensile test of 0.8 MPa or more. If the elastic modulus is 0.8 MPa or more, desired pressure resistance can be obtained by wrapping the outer periphery of the formed activated carbon with a wrapping material. It is shown that the higher the elastic modulus is, the higher the rigidity is, and the ability to suppress deformation of the molded activated carbon due to the stress from the inner peripheral side to the outer peripheral side of the molded activated carbon is high. Since breakage such as cracking of the molded activated carbon cannot be withstood by stress and is considered to be caused by deformation, it is preferable to use the packaging material having the above elastic modulus. When a packaging material having an elastic modulus of less than 0.8 MPa is used, desired pressure resistance can be obtained by packaging two or more rounds on the outer periphery of the formed activated carbon.
The elastic modulus is obtained by the following formula 1 when a tensile test is performed at a speed of 50 mm / min in an atmosphere of 25 ° C. using a tensile tester. The elastic modulus of the packaging material in the present invention is the load It is an elastic modulus at the time of becoming 2 gf / mm.
Formula 1: E = σ / ε = {F / (S × G)} / (Δx / x)
E: Elastic modulus (MPa) σ: Stress (MPa) ε: Strain (-)
F: Load (gf) G: Gravitational acceleration (m / s ² ) S: Cross-sectional area (m ² )
Δx: Displacement (m) x: Initial effective length (m)

When a nonwoven fabric is used for the packaging material, examples of the component include polyester, polypropylene, polyethylene, polyacrylonitrile, polyvinyl alcohol, cellulose, nylon, polystyrene, and the like. The nonwoven fabric production method may be appropriately selected from known methods such as a spunbond method, a melt blow method, a thermal bond method, a chemical bond method, a needle punch method, and a spunlace method.

Further, as the nonwoven fabric of the packaging material, it is preferable to use a nonwoven fabric in which the constituent fibers are core-sheath type composite fibers. This is a non-woven fabric formed of a composite fiber composed of a first component as a core and a second component fiber in the sheath portion. If it is a core-sheath type composite fiber, the melting point of the sheath component can be made lower than that of the core component, and in that case, it can be easily welded without breaking by melting only the component of the sheath portion and packaged. Fixing is easy and preferable. As a core-sheath type composite fiber in which the melting point of the sheath component is lower than that of the core component, for example, a composite fiber using polyester, polypropylene, cellulose, nylon or the like as the core component and polyethylene, polystyrene or the like as the sheath component Is mentioned. In the composite fiber having the above-described configuration, the core component is preferably a component having a melting point higher by 20 ° C. than the melting point of the sheath component. By using such a composite fiber, only the sheath portion is melted and broken. We can weld without.

The manufacturing method of the molded activated carbon cartridge will be described by taking a wet molding method in which molding is performed by sucking slurry containing activated carbon as an example. The overall process outline is to produce a molded activated carbon by drying a cylindrical shaped activated carbon precursor on which activated carbon is deposited by sucking slurry and winding the packaging material around the molded activated carbon to obtain a molded activated carbon cartridge Is the method.

First, a fibrous binder, activated carbon and water are mixed to prepare a slurry. The fibrous binder may be adjusted in the degree of fibrillation by a beater before preparing the slurry. The concentration of the solid content in the slurry is preferably 1% by mass or more and 10% by mass or less. When the solid content concentration is less than 1% by mass, it takes time for molding, and the production efficiency deteriorates. When the solid content concentration is higher than 10% by mass, it becomes difficult to uniformly stir the slurry, and it becomes difficult to obtain uniform shaped activated carbon.

As for the method of sucking the slurry, the slurry is sucked through a cylindrical mold having a large number of small holes, or the slurry is poured into a double tube type container having an outer tube and an inner tube having a large number of small holes. And a suction method.

The drying temperature of the molded activated carbon precursor is preferably 90 ° C or higher and 140 ° C or lower. When the drying temperature is higher than 140 ° C., the fibrous binder may be modified. When the drying temperature is less than 90 ° C., the drying speed is lowered and the efficiency is deteriorated.

In the packaging step on the molded activated carbon, a method of winding the outer circumference of the molded activated carbon in the circumferential direction while applying a tension of 2 gf / mm or more to the packaging material is preferable. By winding the packaging material while applying a tension in the circumferential direction, a radial stress is generated from the outer peripheral side of the formed activated carbon by tightening. By this stress, the effect that the packaging material supports the molded activated carbon against the load generated from the inner peripheral side to the outer peripheral side when water is passed is obtained, and a pressure resistance performance of 0.1 MPa or more is exhibited.

As a method for applying tension, a dancer roll is provided between the unwinding part of the raw material roll wound with the packaging material and the molded body as the winding part, and a constant tension is applied by controlling the unwinding speed of the packaging material. Alternatively, there is a method of applying a constant tension by controlling the torque of the unwinding part. Although there is a method of winding the wrapping material around the molded activated carbon and then applying a tension in the opposite direction to the unwinding and squeezing with the torque of the winding part, the stress due to the tightening may vary in the circumferential direction of the molded activated carbon.

By bonding the packaging material around the molded activated carbon in a state where it is wound one or more times, the packaging material can be fixed to the outer periphery of the molded activated carbon in a state where there is a tightness due to tension. Examples of the bonding method include a method using an adhesive and hot melt, welding by heating and ultrasonic waves, and the like. When using the above-mentioned non-woven fabric as the packaging material, it is preferable to use a method using heating or ultrasonic waves from the viewpoints of handleability and production efficiency.

A cap member is bonded to the end of the molded activated carbon cartridge as necessary and accommodated in a water flow container so that water can flow from the inner peripheral side to the outer peripheral side of the molded activated carbon without leakage.

Each characteristic value was measured by the following method.

(1) Pressure resistance test Cap members were bonded to both ends of the molded activated carbon cartridge and accommodated in a water passage container. The passage through which water flows in the radial direction from the inner circumference side to the outer circumference side of the cylindrical molded activated carbon cartridge is defined as a filtration side path, and the difference in water pressure on the filtration side downstream from the upstream water pressure of the molded activated carbon cartridge at this time is The pressure was set to 0.1 MPa. By changing the flow path of the container for water flow, the path through which the inner peripheral side of the molded activated carbon cartridge was passed only in the full length direction and the filter medium part of the molded activated carbon cartridge was not passed was defined as the raw water side path. Switching between 1-second water flow through the raw water-side path and 1-second water flow through the filtration-side path was repeated 3650 times in a reciprocating manner, and the presence or absence of breakage of the formed activated carbon was confirmed. For confirmation of damage, peel off the packaging material of the molded activated carbon cartridge, visually observe the surface of the molded activated carbon, determine that there is no crack or chip on the surface of the molded activated carbon, determine that there is no damage, and the pressure resistance is 0.1 MPa The case where it was evaluated as above, and the case where cracking or chipping could be confirmed was judged as “breakage”, and the pressure resistance was evaluated to be lower than 0.1 MPa. In addition, when measuring the removal performance of free residual chlorine after this pressure | voltage test, it measured before peeling off a packaging material, and confirmation of damage was performed by peeling a packaging material after a measurement.

(2) Measurement of elastic modulus of packaging material A dry packaging material having an effective length of 50 mm and a width of 50 mm was subjected to a tensile test at a speed of 50 mm / min. For the measurement, a tensile tester (STA-1150, manufactured by A & D Corp.) was used, and the ambient temperature was 25 ° C. From the strain with respect to the load applied to the sample and the thickness of the packaging material, the elastic modulus (MPa) was calculated by the following formula 1. The value of the elastic modulus at a load of 2 gf / mm, that is, 100 gf / 50 mm was taken as the elastic modulus of the sample. This operation was repeated for 10 samples of the packaging material, and the arithmetic average value was taken as the result.
Formula 1: E = σ / ε = {F / (S × G)} / (Δx / x)
E: Elastic modulus (MPa) σ: Stress (MPa) ε: Strain (-)
F: Load (gf) G: Gravitational acceleration (m / s ² ) S: Cross-sectional area (m ² )
Δx: Displacement (m) x: Initial effective length (m)

(3) Measurement of particle size distribution A 50% particle size (center particle size) in a volume-based cumulative particle size distribution was determined using a laser diffraction particle size distribution measuring device ("SALD-3100" manufactured by Shimadzu Corporation).

(4) Measurement of free residual chlorine removal performance The free residual chlorine removal performance of the molded activated carbon cartridge was measured at a flow rate of 3 L / min according to JIS S 3201: 2017.

[material]
Activated carbon A: Powder activated carbon fiber binder having a center particle size of 140 μm and iodine adsorption of 1500 mg / g: Acrylic fiber (“BiPUL” manufactured by Toyobo Co., Ltd.)
Non-woven fabric A: Non-woven fabric made of polyester with elastic modulus of 1.0 MPa and thickness of 0.2 mm B: Non-woven fabric made of core-sheath composite fiber made of polyethylene (sheath component) and polyester (core component) with elastic modulus of 0.9 MPa and thickness of 0.3 mm Non-woven fabric C: Non-woven fabric comprising a core-sheath composite fiber made of polyethylene (sheath component) and polyester (core component) having an elastic modulus of 0.4 MPa and a thickness of 0.3 mm

[Example 1]
Activated carbon A and fibrous binder were added to water at a ratio of 95: 5 on a mass basis and mixed to prepare a slurry. The solid concentration in the slurry is 3% by mass, and the slurry is sucked through a cylindrical mold having a large number of small holes to produce a cylindrical molded activated carbon precursor having an outer diameter of 30 mm, an inner diameter of 10 mm, and a total length of 120 m. did. The shaped activated carbon precursor was dried in a drying furnace at 120 ° C. for 5 hours to obtain shaped activated carbon. Nonwoven fabric C was used as a packaging material on the outer periphery of the molded activated carbon, and was wound twice while applying a tension of 2.0 gf / mm to obtain a molded activated carbon cartridge.
When the free residual chlorine removal performance was measured after performing the pressure resistance test, it was a good filtration performance with a removal rate of 99%. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, the molded activated carbon surface was not damaged.

[Example 2]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the nonwoven fabric A was used as a packaging material for the molded activated carbon and was wound once while applying a tension of 2.0 gf / mm. When a nonwoven fabric was wound around the outer periphery of the formed activated carbon and fixed by welding, it took a little time compared to Example 1.
When the free residual chlorine removal performance was measured after performing the pressure resistance test, it was a good filtration performance with a removal rate of 99%. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, the molded activated carbon surface was not damaged.

[Example 3]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the nonwoven fabric B was used as a packaging material for the molded activated carbon and was wound once while applying a tension of 2.0 gf / mm. Since the nonwoven fabric B was only wound once around the outer periphery of the molded activated carbon, it could be produced more efficiently than in Example 1.
When the free residual chlorine removal performance was measured after performing the pressure resistance test, it was a good filtration performance with a removal rate of 99%. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, the molded activated carbon surface was not damaged.

[Example 4]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the nonwoven fabric B was used as a packaging material for the molded activated carbon and was wound twice around while applying a tension of 0.5 gf / mm.
When the free residual chlorine removal performance was measured after performing the pressure resistance test, it was a good filtration performance with a removal rate of 99%. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, the molded activated carbon surface was not damaged.

[Comparative Example 1]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the packaging material was not wound on the molded activated carbon.
Since the pressure resistance test was performed and no packaging material was wound, the surface of the molded activated carbon was observed as it was, and cracks were generated on the surface. Subsequently, when the free residual chlorine removal performance was measured, the removal rate of free residual chlorine was 45%, which was low. It was considered that the filtration performance deteriorated due to raw water leak because cracks were generated on the surface of the molded activated carbon.

[Comparative Example 2]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the nonwoven fabric B was used as a packaging material for the molded activated carbon and was wound once while applying a tension of 0.5 gf / mm.
When the free residual chlorine removal performance was measured after the pressure resistance test, the free residual chlorine removal rate was 51%, which was low. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, cracks occurred on the surface of the molded activated carbon. It was considered that the filtration performance deteriorated due to raw water leak because cracks were generated on the surface of the molded activated carbon.

[Comparative Example 3]
A molded activated carbon cartridge was obtained in the same manner as in Example 1 except that the nonwoven fabric C was used as a packaging material for the molded activated carbon and was wound once while applying a tension of 2.0 gf / mm.
When the free residual chlorine removal performance was measured after the pressure resistance test, the removal rate of free residual chlorine was 55%, which was low. After measuring the free residual chlorine removal performance, the packaging material of the molded activated carbon cartridge was peeled off, and the surface of the molded activated carbon was visually observed. As a result, cracks occurred on the surface of the molded activated carbon. It was considered that the filtration performance deteriorated due to raw water leak because cracks were generated on the surface of the molded activated carbon.

Table 1 summarizes the results of the above examples and comparative examples. In Examples 1 to 4 where there was no breakage such as cracking in the pressure test, excellent free residual chlorine removal performance was exhibited. Since Example 2 and Example 3 changed the type of packaging material from Example 1 to a nonwoven fabric having an elastic modulus of 0.8 MPa or more, the ability to suppress deformation from the inside to the outside of the molded activated carbon was high, As a result, it was possible to satisfy the pressure resistance with the number of turns of one turn. Moreover, since Example 2 changed the component of the nonwoven fabric from Example 1 to the fiber of only polyester instead of the core-sheath type composite fiber, the problem that the nonwoven fabric breaks easily under the condition that the polyester quickly melts. Therefore, in Example 2, it was necessary to melt and bond only the surface over time under the welding conditions in which the polyester gradually melted, and time was required for the packaging process. Example 4 has a smaller tension than that of Example 1 to wind the nonwoven fabric around the outer periphery of the charcoal, but the ability to suppress deformation of the molded activated carbon from the inside to the outside by winding the nonwoven fabric having an elastic modulus of 0.8 MPa or more twice. Was sufficient, so pressure resistance was exhibited.

Since Comparative Example 1 was not wrapped with a packaging material, there was no effect of suppressing deformation, and as a result, pressure resistance performance was not achieved. Since Comparative Example 2 had a low tension for winding the nonwoven fabric around the outer periphery of the forming charcoal and only a single wrapping, the ability to suppress deformation of the formed activated carbon was insufficient, and as a result, pressure resistance was not achieved. In Comparative Example 3, since the nonwoven fabric having an elastic modulus of less than 0.8 MPa was wrapped only once, the ability to suppress deformation of the molded activated carbon was insufficient, and as a result, pressure resistance performance was not achieved.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on a Japanese patent application filed on Mar. 28, 2018 (Japanese Patent Application No. 2018-061427), the contents of which are incorporated herein by reference.

The molded activated carbon cartridge of the present invention is suitably used as a filter for removing free residual chlorine and the like in tap water.

Claims

A molded activated carbon cartridge comprising a cylindrical molded activated carbon containing activated carbon and a fibrous binder, and a packaging material wound around the outer periphery of the molded activated carbon,
A molded activated carbon cartridge having a pressure resistance of 0.1 MPa or more when water is passed from the space inside the molded activated carbon cartridge to the outside of the molded activated carbon cartridge through the molded activated carbon and the packaging material.
The molded activated carbon cartridge according to claim 1, wherein the elastic modulus of the packaging material is 0.8 MPa or more.
The molded activated carbon cartridge according to claim 1 or 2, wherein the packaging material is a nonwoven fabric.
The molded activated carbon cartridge according to claim 3, wherein the fiber constituting the nonwoven fabric is a core-sheath type composite fiber.
A method for producing a molded activated carbon cartridge, in which a packaging material is wound around a cylindrical molded activated carbon containing activated carbon and a fibrous binder while applying a tension of 2.0 gf / mm or more in the circumferential direction.