JPH08164378A - Harmful substance removing sheet and container type filter using the same - Google Patents

Abstract

PURPOSE: To improve water permeability (gas permeability) of the sheet by using pulp and specified amounts of fibrous activated carbon and inorganic particles as the components of a material for forming a harmful substance removing sheet which is appropriately used for a simple throwaway container type filter for purifying water such as tap water, etc. CONSTITUTION: This container type filter 1 consists of a combination of a cylindrical body made of paper and the harmful substance removing sheet 2 and preferably, the sheet 2 is fitted to the bottom of the filter 1 and more desirably, all or a part of one side of the peripheral wall in the axial direction of the cylindrical body is formed from the sheet 2 in place of paper. At this time, the harmful substance removing sheet 2 used comprises pulp, 10 to 60wt.% of fibrous activated carbon and 1 to 30wt.% of inorganic particles and preferably, also contains 5 to 35wt.% of heat-fusible fiber and/or <=20wt.% of a reducing substance. Thus, the objective sheet 2 having good water permeability (gas permeability) and sufficient strength can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmful substance removing sheet utilizing the ability of activated carbon to remove harmful substances, and in particular the sheet forming ability of fibrous activated carbon, and using the harmful substance removing sheet. The present invention relates to a simple disposable type container-type filter that purifies various liquids or gases (hereinafter sometimes simply referred to as a medium), for example, water such as tap water.

[0002]

2. Description of the Related Art It is well known that activated carbon has a property of adsorbing or reducing harmful substances, and is therefore used for purification of various media.

In recent years, tap water, etc., has been further purified as drinking water, resulting in residual chlorine (challenge smell), musty smell, trihalomethane, etc.
It has been widely desired to reduce harmful substances such as suspended substances, and water purifiers using the activated carbon are widely used.

As a method for purifying tap water in general households, water purifiers of direct connection to the water supply are widely used. The water purifier is filled with a filtering material such as activated carbon or ion exchange resin, and tap water is passed through the water purifier to be discharged to the outside of the water purifier through a hollow fiber membrane or the like. (Hereinafter, this is referred to as a conventional example).

Further, a cartridge-type tabletop water purifier (hereinafter referred to as a conventional example) has been commercially available. In the conventional example, a cartridge made of a filter material such as activated carbon is attached to a resin container, tap water is passed through the cartridge to purify it, and the purified water is stored in a separate container for use. When the cleaning power becomes poor, the cartridge is appropriately removed and replaced.

Further, Japanese Utility Model Laid-Open No. 1-167386 (hereinafter referred to as a conventional example) describes a funnel type simple drinking water purifying device. In the conventional example, a bag-shaped filter containing activated carbon inside is provided inside a funnel-shaped member, and tap water is poured into the funnel-shaped device, and purified water is collected in a separate container for use.

[0007]

Conventionally, there has been an idea of forming activated carbon into a sheet-shaped filter. However, in the case of simply molding by mixing fibrous activated carbon and pulp, if the emphasis is placed on the paper strength required for the molding process, the water permeability (breathability) will be very poor and filtration will take a long time. There is a problem that the paper strength becomes insufficient when the emphasis is placed on breathability.
After all, there was a problem that it could not be used.

The present invention has been made to solve such a problem, and it is an object of the present invention to provide a harmful substance removing sheet having good water permeability (breathability) utilizing the harmful substance removing ability of activated carbon. The first purpose.

On the other hand, as a problem of the conventional water purifier,
In the above conventional example, the device is large and lacks in simplicity,
It is expensive, and in addition, the container is made of plastic, which causes a problem of dust when it is thrown away. Furthermore, in the above-mentioned conventional example, there was a concern that residual water would be retained around the filter material contained in the container, and miscellaneous bacteria would propagate.
Especially in the conventional example, when reusing after leaving for a while,
There is a waste of discharging it as it is for the purpose of replacing and discharging residual water in the container with fresh water immediately after opening the faucet.

Therefore, there is a demand for a disposable type water purifier which is easy and easy to use, and which is inexpensive and does not worry about the propagation of germs without using hollow fiber membranes or antibacterial fibers. The above-mentioned conventional example is a simple purifying device consisting of a bag-shaped filter member, but in the present invention, the harmful substance removing sheet in the form of a sheet that is easy to dry is used, and there is no fear of bacterial propagation, and it is easy, simple, and inexpensive. A second object is to provide a container type filter which is a disposable type and has a good usability.

[0011]

SUMMARY OF THE INVENTION A harmful substance removing sheet according to the present invention is a sheet containing pulp, 10 to 60% by weight of fibrous activated carbon, and 1 to 30% by weight of inorganic particles. To do. Further, the harmful substance removing sheet is 5
It preferably contains 35% by weight of heat fusible fibers and / or 20% by weight or less of reducing substances.

The gist of the container-type filter according to the present invention is that it is constituted by combining the harmful substance removing sheet with a tubular member made of paper. Further, it is preferable that the container type filter has the harmful substance removing sheet attached to one end of the tubular body. Further, it is preferable that all or part of the peripheral wall on one side in the axial direction of the tubular body is made of a harmful substance removing sheet instead of paper. In addition, it is more preferable that the inner peripheral surface of the tubular body is lined with a harmful substance removing sheet.

[0013]

In the harmful substance removing sheet of the present invention, the contained inorganic particles are entangled with the fibers to widen the openings, act to increase the water (aeration) speed, and impart strength to the sheet. It is possible to improve the sheet shape retention. Next, each component of the harmful substance removing sheet will be described.

Fibrous activated carbon: 10 to 60% by weight The contact of the medium with the fibrous activated carbon removes the harmful substances in the medium. The content of the fibrous activated carbon in the harmful substance removing sheet is 10% by weight. If it is less than%, the removal of harmful substances becomes insufficient, so the lower limit was made 10% by weight. On the other hand, if it exceeds 60% by weight, the workability and handleability of the harmful substance removing sheet deteriorate. That is, for example, when the harmful substance removing sheet is bent, the activated carbon component falls off, and the ease of punching into a mold becomes poor. Therefore, the upper limit is 60% by weight.
And A more preferable range is 15 to 50% by weight,
A more preferable range is 20 to 40% by weight.

Pulp: 5 to 89% by weight Pulp is added as an inexpensive reinforcing member for forming a sheet, and examples thereof include natural pulp and synthetic fiber pulp. When the content of pulp is less than 5% by weight, the harmful substance removing sheet has no reinforcing effect, while when it exceeds 89% by weight, the amount of fibrous activated carbon is relatively small and the removal rate of harmful substances becomes poor. did. A preferred range is 10 to 50% by weight, and a more preferred range is 30 to 40% by weight.

Reducing substance: 0 to 20% by weight The reducing substance mainly effectively reduces and removes HClO in the liquid to be treated (gas to be treated). When the harmful substance removing sheet is used in a water purifier, calcium sulfite or sodium L-ascorbate, which is not a problem in food hygiene, is recommended as a reducing substance. When the content of the reducing substance is more than 20% by weight, the rate of water flow (aeration) at the time of filtration becomes too slow, so the content was made 20% by weight or less. A more preferable range is 3 to 10% by weight.

Inorganic particles: 1 to 30% by weight As the content of the inorganic particles increases, the water flow (aeration) speed may increase, but if the content exceeds 30% by weight, the same as in the case of the above fibrous activated carbon. The workability and handleability such as bending of the harmful substance removing sheet and easiness of punching into a mold are deteriorated. On the other hand, if it is less than 1% by weight, the water (aeration) speed becomes too slow, so the above range was set. A more preferable range is 3 to 20% by weight.

Coral sand, which is a powder of coral, is recommended as the inorganic particles, and when the coral sand is used as a water purifier, minerals are supplemented to the purified water to produce particularly healthy water. The particle size of coral sand is preferably 20 to 60 μm. Besides, silica sand or glass can be used as the inorganic particles.

Heat fusible fiber: 5 to 35% by weight If the heat fusible fiber is added to the harmful substance removing sheet,
When the harmful substance removing sheet is attached to the paper tubular body, they can be joined by heat fusion, and an adhesive is not required. When an adhesive is used, a new problem of mixing the adhesive into purified water may occur, but in the case of containing a heat-fusible fiber, there is no such concern, and a container type filter can be easily manufactured. be able to. As the heat-fusible fiber, copolyester, polyethylene, polypropylene, etc. are recommended from the viewpoint of safety and hygiene.

If the content of the heat-fusible fiber is less than 5% by weight, the adhesion to the tubular body will be insufficient, while the content of 35% by weight will be sufficient.
Since it becomes difficult to make a harmful substance removing sheet,
The above range was set. More preferable range is 10 to 30.
% By weight.

Next, the container type filter of the present invention will be described. The container type filter of the present invention utilizes the harmful substance removing ability of the harmful substance removing sheet and is combined with a tubular body made of paper. Both the harmful substance removing sheet and the tubular body are discarded. In this case, the problem of dust is mild and inexpensive. Furthermore, since it is a container type, it is possible to stack multiple containers as needed, and when the user desires water with a higher degree of purification,
Thus, by using the containers of the present invention in a stacked manner, desired purified water can be obtained.

In the conventional water purifier, during use,
Since the filter medium is immersed in water, various bacteria are likely to propagate, which is unsanitary, and there is a risk of clogging due to the proliferation of various bacteria. However, in the case of the container type filter of the present invention, it is easy to leave it to naturally dry after making the required amount of purified water, and this drying does not cause any germs to propagate, and is therefore hygienic. Moreover, there is no concern about clogging due to various bacteria.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a perspective view of a container type filter according to an embodiment of the present invention which is looked up from an oblique bottom direction.
(B) is a sectional view taken along the line AA. The container type filter 1 is a cup type, a cylindrical body 3 having a slightly wide cone shape on the upper side is made of waterproof paper, and a bottom portion 2 is made of a harmful substance removing sheet.

Sheets for removing harmful substances of Examples and Comparative Examples having the sheet compositions shown in Table 1 below were produced, and using this as the bottom portion 2, the cup type container type filter 1 shown in FIG. 1 was produced. Incidentally, as the heat-fusible fiber, a copolyester,
Calcium sulfite was used as the reducing substance, and coral sand (particle size around 40 μm) was used as the inorganic particles.
The performances of the harmful substance removing sheets (container type filter) of these Examples and Comparative Examples were evaluated by the following test methods.

<HClO removal rate> 200 ml of water containing 1 ppm of residual chlorine was passed through the harmful substance removing sheet once, and the residual chlorine of the passed water was measured to obtain the HClO removal rate (%). . <Water permeability> The water permeability was measured by measuring the time (seconds) required to pass 100 ml of water through a harmful substance removing sheet having an area of 19.6 cm ² (50 mmφ).

<Lifespan> The total amount (l) of the water to be treated until the removal rate of residual chlorine was 60% or less was measured, and the lifespan was evaluated. <Cup workability> Ease of punching into the shape of the bottom portion 2 when manufacturing the container type filter 1 using the harmful substance removing sheet, and easy integration of the harmful substance removing sheet and the tubular body 3. Was evaluated by the tester's observation. The results are shown in Table 1 below.

[0027]

[Table 1] As can be seen from Table 1 above, in this example, the HClO removal rate,
Both water permeability and life are good, and cup workability is good in the examples in which a copolyester is added. Next, a method of using the container type filter 1 shown in FIG. 1 as a water purifier will be described.

FIG. 2 is a perspective view showing the container type filter 1 in use. In use, the container type filter 1 is supported by a supporting member 5 having a circular hole having a diameter of a middle section in the height direction, while supporting the container type filter 1 in a suspended manner.
Is placed on the upper part of the storage container 4, and water from the water tap 7 is poured into the container type filter 1. Water is purified by the harmful substance removing sheet on the bottom 2 of the container type filter 1, and the purified water 6 purified and discharged from the bottom 2 is stored in the storage container 4 and used as drinking water or the like.

FIG. 3 is a sectional view of a container type filter 1 according to another embodiment of the present invention. The filtering unit 8 is composed of the same harmful substance removing sheet as above, and extends from the bottom of the container-type filter 1 to below the tubular body. Note that the harmful substance removing sheet is not limited to the entire circumference below and may be a part thereof. The tubular body 9 is made of paper as described above. In the case of this embodiment, as compared with the embodiment shown in FIG. 1, since the area of the harmful substance removing sheet used for discharging water is large, the time required for water purification is shorter.

FIG. 4 is a sectional view showing a container type filter 1 according to another embodiment of the present invention. In this embodiment, the lining member 10 made of the harmful substance removing sheet is provided not only on the bottom portion 2 but also on the inner peripheral surface of the tubular body 3. In this embodiment, water comes into contact with the lining member 10 at the time of purification and undergoes some purification action there, so that more purified water can be obtained.

In the embodiment of the container type filter shown in FIGS. 1, 3 and 4, the supporting member 5 is separately required at the time of use. Alternatively, the lower edge may be provided with a collar, and the upper edge of the storage container 4 may be supported by the collar.

In the embodiment of the container type filter described above, the cylindrical body and the bottom portion composed of the harmful substance removing sheet are joined together. However, a support member having water permeability to the bottom portion of the cylindrical body, such as mesh or A crosspiece may be provided and a harmful substance removing sheet may be placed on the supporting member for use. In addition, although the round cup type is shown in the embodiment of the container type filter, it is not limited to the round type and may be a square type container type filter.

[0033]

Industrial Applicability The harmful substance removing sheet according to the present invention is a sheet using activated carbon for removing harmful substances, has good water permeability (breathability), and has sufficient strength. Further, the container-type filter according to the present invention is free from propagation of various bacteria, is easy and easy to use, and is inexpensive, and can be used as a disposable type filter. Therefore, not only can it be used permanently in the home, but it can also be carried outside and used outdoors.

[Brief description of drawings]

FIG. 1 is a view showing a container type filter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a usage state of the container type filter according to the present invention.

FIG. 3 is a sectional view of a container type filter according to another embodiment of the present invention.

FIG. 4 is a sectional view of a container type filter according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container type filter 2 Bottom part 3,9 Cylindrical body 4 Storage container 5 Supporting member 6 Clean water 7 Water faucet 8 Filtration part 10 Lining member

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location C02F 1/68 530 F 540 A H Z 1/70 Z

Claims (7)

[Claims] 1. Removal of harmful substances, characterized in that it contains at least fibrous activated carbon and pulp as a sheet forming material, and contains 10 to 60% by weight of the above fibrous activated carbon and 1 to 30% by weight of inorganic particles, respectively. Sheet. 2. The harmful substance removing sheet according to claim 1, wherein the harmful substance removing sheet contains 5 to 35% by weight of a heat-fusible fiber. 3. The harmful substance removing sheet according to claim 1, wherein the harmful substance removing sheet contains 20% by weight or less of a reducing substance. 4. The container type filter according to claim 1, wherein the harmful substance removing sheet is combined with a paper cylindrical body. 5. The container-type filter according to claim 4, wherein the harmful substance removing sheet is attached to one end of the tubular body. 6. The container type filter according to claim 4, wherein all or part of the peripheral wall on one axial side of the tubular body is formed of a harmful substance removing sheet instead of paper. 7. The container type filter according to claim 4, wherein an inner peripheral surface of the tubular body is lined with a harmful substance removing sheet.