JPH0726450A - Activated carbon fiber sheet and method for producing the same - Google Patents

Abstract

PURPOSE:To provide an uniform active carbon fiber sheet improved in its strength and breaking elongation without deteriorating the various characteristics of the active carbon fibers, free from the falling of the active carbon fibers, and having a high adsorptivity, and a method for producing the same. CONSTITUTION:An active carbon fiber sheet is characterized by comprising a composite web having an active carbon fiber layer comprising 1090wt.% of active carbon fibers and 90-10wt.% of organic fibers having an aspect ratio of 1000-2500 and an organic fiber layer comprising organic fibers having an aspect ratio of 1000-2500 and formed by a wet paper-making method, the active carbon fibers being three-dimensionally interlaced in the organic fibers of both the layers by a water jet interlacing method, and a method for producing the same. It is preferable that the diameters of the organic fibers in the organic fiber layer are <=94mu and that the cross-sectional shapes of the organic fibers in both the layers are modified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification filter for adsorbing or separating offensive odors, organic substances or dissolved substances in fluids, sanitary products such as masks, sanitary products and sheets,
The present invention relates to an activated carbon fiber sheet used for deodorizing articles such as shoes and refrigerators, and particularly to both sheet strength and elongation at break without impairing various properties of the activated carbon fiber. The present invention relates to a uniform activated carbon fiber sheet which is excellent and does not drop out of activated carbon fiber and has a high adsorption ability, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, toxic gases such as odors and organic solvents have been closed up due to environmental problems, and adsorptive substances, especially activated carbon, have been conventionally used as a means for preventing them. Recently, activated carbon fibers, in particular, have a very large specific surface area, and have a high adsorption capacity and a large speed of adsorption / desorption, so that their presence has been particularly noted.

When the activated carbon fiber is made into a sheet, some kind of binder is required because the activated carbon fiber does not have self-adhesiveness. As the binder of the activated carbon fiber, various solution type or emulsion type liquid binders and fibrous binders are generally used. The use of a liquid binder is not preferable because it blocks the pores of the activated carbon fiber and deteriorates its various properties. Further, regarding a fibrous binder made of a fibrous or pulp-like organic resin,
A large amount of fiber is required to give the alloy sufficient strength, and not only does the content of the activated carbon fiber decrease, but when a molten binder is used, the activated carbon fiber is melted when the binder is melted. However, it has the drawback of blocking the pores of. Cellulosic pulp fibers are often used as a binder to reduce the amount of binder used, but it is inevitable that the sheet density increases and the air permeability required for the filter deteriorates. .

On the other hand, in Japanese Unexamined Patent Publication (Kokai) No. 4-363107, an activated carbon fiber layer is sandwiched between two chemical fibers or wool fibers, and a needle having a plurality of prickle protrusions is penetrated through these laminated materials. By repeating the process of pulling out and pulling out a large number of times, a part of the upper and lower chemical fibers or wool fibers are entangled three-dimensionally through the activated carbon fiber layer,
A method of expressing sheet strength is disclosed.
However, in this method, while repeating the process of penetrating and withdrawing the needle with a plurality of prickly protrusions many times,
The needle may damage the activated carbon fiber, break it finely, or
Since a large number of needle hole traces are left on the surface of the sheet, there is a problem that the finely divided activated carbon fibers may fall off when the sheet is used.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art, and is excellent in sheet strength and elongation at break without impairing various characteristics of activated carbon fiber, It is an object of the present invention to provide a uniform activated carbon fiber sheet having a high adsorption ability without the activated carbon fibers falling off, and a method for producing the same.

[0006]

The present inventor has conducted extensive studies to achieve the above object, and as a result, activated carbon fiber sheet
The present invention has led to the invention of a sheet and its manufacturing method. That is, the activated carbon fiber sheet of the present invention comprises an activated carbon fiber layer comprising 10 to 90% by weight of activated carbon fibers and 90 to 10% by weight of organic fibers having an aspect ratio of 1000 to 2500, and one side of the activated carbon fiber layer. Or both sides have an aspect ratio of 10
An organic fiber layer composed of an organic fiber of 0 to 2500, and the organic fibers constituting both layers of the organic fiber layer and the activated carbon fiber layer are three-dimensionally entangled with the activated carbon fiber interposed. It is characterized in that the activated carbon fiber layer and the organic fiber layer are integrated.

The fiber diameter of the organic fibers of the activated carbon fiber layer is preferably 9 μm or less, and the cross-sectional shape of the organic fibers constituting the activated carbon fiber layer and the organic fiber layer is preferably an atypical cross section.

Further, the method for producing an activated carbon fiber sheet of the present invention comprises 10 to 90% by weight of activated carbon fiber and at least 1.
A slurry in which 90 to 10% by weight of organic fibers having an aspect ratio of 1000 to 2,500 or more in water is dispersed in water and a slurry in which organic fibers having an aspect ratio of 1000 to 2500 are dispersed in water are prepared by a wet papermaking method. 2 layers or 3
Combined into layers, to form a composite web with an organic fiber layer on one or both sides of the activated carbon fiber layer, then,
Using a hydroentangling method for the composite web, a high-pressure columnar water stream is applied from the organic fiber layer side, and the organic fibers constituting both layers of the organic fiber layer and the activated carbon fiber layer are interposed with the activated carbon fiber, It is characterized in that the organic fiber layer and the activated carbon fiber layer are integrated together by three-dimensionally intertwining.

The present invention will be described in detail below. First,
The components used in the present invention will be described.

The activated carbon fiber used in the present invention is a carbon fiber having a particularly excellent adsorption ability, and generally 100 m ² /
It has a specific surface area of g or more. The preferred specific surface area is 700 m ² / g or more, but when the specific surface area of the activated carbon fiber is extremely large, the fiber strength becomes small, so the specific surface area is preferably 2500 m ² / g or less.

As such activated carbon fiber, cotton,
Hemp, recycled cellulose fiber, polyvinyl alcohol fiber,
A raw material fiber such as an acrylic fiber, an aromatic polyamide fiber, a crosslinked formaldehyde fiber, a lignin fiber, a phenol fiber, a petroleum pitch fiber, or a coal pitch fiber can be carbonized and surface-activated at a high temperature according to a conventional method.

The shape, fiber diameter, and fiber length of the activated carbon fibers are not particularly limited, but the activated carbon fibers are prevented from falling off when a high-pressure columnar water stream is applied to the fiber web, and the formation is good. In order to obtain the activated carbon fiber sheet, the average fiber diameter is preferably 5 to 30 μm, more preferably 10 μm to 25 μm. The average fiber length is preferably 3 mm to 15 mm, more preferably 5 mm to 10 mm.

In the present invention, the above activated carbon fibers may be used alone, or a plurality of activated carbon fibers may be mixed depending on the use.

The types of organic fibers used in the present invention include:
There is no particular limitation, and depending on the application, polyester fiber, polyolefin fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, nylon fiber, urethane fiber may be used alone or any combination of these fibers may be used. You can In addition, a fiber in which two or more kinds of components having a small compatibility with each other are joined, and easily split by a mechanical action or an action of a swelling agent,
Peelable split conjugate fibers that generate ultrafine fibers can be used.

The organic fiber of the activated carbon fiber layer and the organic fiber layer used in the present invention must have an aspect ratio of at least one type of 1000 to 2500. Further, the fiber diameter of the organic fiber of the activated carbon fiber layer is preferably 9 μm or less. Below this fiber diameter, the number of organic fibers in the activated carbon fiber layer is increased, and the fibers themselves are easily bent, and the high pressure columnar water flow surrounds the activated carbon fibers, and the fibers can be entangled with each other. Therefore, the activated carbon fibers are less likely to fall off.

The fiber length of the organic fiber used in the present invention is from 5 to 5.
It is preferably 25 mm. If the fiber length is longer than 25 mm, the dispersion process in water is difficult, and it is necessary to select an appropriate amount of dispersant and use it in an appropriate amount. Also, once disperse it, it will aggregate again to cause twisting, entanglement, and deception. The problem arises that it will be easier to do. Also, the dispersion concentration must be lowered, resulting in poor productivity.

On the other hand, when the fiber length is shorter than 5 mm, the dispersion process is easy, but it is easy to move due to the high pressure columnar water flow.
It is difficult to bend and entangle fibers and it has a high strength.
In addition to being difficult to obtain, the active carbon fiber cannot be sufficiently captured because it surrounds the activated carbon fiber, which causes the activated carbon fiber to fall off. Further, since the fibers move as a whole, the fibers are displaced from each other, causing strain inside the sheet, and causing a lot of wrinkles in the sheet after the high-pressure columnar water stream is jetted.

The cross-sectional shape of the organic fiber used in the present invention is not limited to a circular shape, but may be an elliptical shape, more preferably a so-called atypical cross section such as a triangular shape, a Y-shape, a T-shape, a U-shape, a star shape, and a dog-bone shape. It is better to have a shape. When the cross-sectional area of the organic fiber is the same between the perfect circle and the atypical cross section, the behavior against bending is different, and the organic fiber having the atypical cross section has anisotropy in bending rigidity, and the rigidity in the minor axis direction Is extremely small, so that it easily bends in the minor axis direction and is easily entangled.
Therefore, in the organic fiber having the atypical cross section, the fibers are easily entangled while surrounding the activated carbon fiber during the hydroentangling. Further, since the modified cross section has corners and is better caught on the activated carbon fiber, there is an effect that the activated carbon fiber is less likely to fall off than a perfect circle.

Further, the activated carbon fibers may be removed by deciding the content of the activated carbon fibers in the activated carbon fiber layer, providing the organic fiber layer only on one side of the activated carbon fiber layer, or on both sides of the activated carbon fiber layer. And the selection of the fiber diameter of the organic fiber used for the organic fiber layer and the basis weight ratio of the activated carbon fiber layer and the organic fiber layer.
The activated carbon fibers in the activated carbon fiber layer are surrounded by and trapped with organic fibers having a small fiber diameter, or even if the activated carbon fiber content is high, the fiber diameter of the organic fibers in the organic fiber layer is reduced to reduce the activated carbon fiber layer. By sandwiching between the both sides, the activated carbon fibers are less likely to fall off. Therefore, the fall of the activated carbon fiber can be eliminated by combining many of the above methods depending on the application.

Next, a method for producing the activated carbon fiber sheet will be described. First, there are a dry method and a wet method for producing a web of activated carbon fiber. The sheet obtained by using the dry method has good breathability, but the texture of the sheet is poor, and The fiber breaks in the process of opening the activated carbon fiber, resulting in a poor yield of activated carbon fiber, which is uneconomical. The sheet produced by the wet method has a uniform sheet and good texture. In addition, the yield of activated carbon fibers is good.

In the method for producing an activated carbon fiber sheet of the present invention, the activated carbon fiber and the organic fiber, or only the organic fiber is disaggregated by adding a surfactant with a pulper or a mixer, and then agitated. Disperse in water under gentle agitation such as
Form a uniform slurry. This slurry is made into a paper by using a paper machine having one or more wires such as a cylinder, a Fourdrin, or a slanted wire to produce a composite web having an activated carbon fiber layer and an organic fiber layer which are well formed. .

After pressing the paper-made wet paper web,
Opening rate 40% or less, the size of one opening is 0.07mm
^It is loaded on a porous support of ² or less, a high-pressure columnar water stream is jetted from above the organic fiber layer side, the high-pressure columnar water stream and the web are relatively moved, and both inside the activated carbon fiber layer and the organic fiber layer. The organic fibers constituting the above are three-dimensionally intertwined with the activated carbon fibers interposed therebetween to integrate the activated carbon fiber layer and the organic fiber layer. As a method for relatively moving the high-pressure columnar water flow and the web, a method of rotating a conveyor type support or a drum type support is convenient. At this time, the transport speed of the support can be 3 to 100 m / min or less.

If the porosity of the support is greater than 40%, the sheet obtained will have porosity. Conversely, the smaller the porosity, the better the surface quality of the obtained sheet, but even if the porosity is 40% or less, the size of one open hole is 0.005.
^On a porous support of mm ² or less, the water required for the entanglement does not escape from the support to the bottom, and after hitting the support, it bounces back to the web again, and the bounced water pushes up the web and breaks the web. A phenomenon occurs, which is not preferable. Examples of such a porous support include a wire such as a plain weave or a twill weave, a metal such as stainless steel or bronze, or a material such as plastic such as reinforced polyester or polyamide.

Next, the activated carbon fiber sheet thus obtained
The sheet can be dried by using a cylinder dryer, an air dryer, or the like, and then subjected to hot pressure processing such as thermal calendar roll treatment to adjust the thickness to an appropriate value.

[0025]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, all parts and% are by weight. The following test methods were used to evaluate the tensile strength, the elongation at break, the specific surface area, and the loss of activated carbon fibers in the examples and comparative examples.

Tensile strength (kg / 2 cm width): According to JIS-P8113, the tensile strength was measured by cutting the activated carbon fiber sheet in the longitudinal and transverse directions into a width of 2 cm and a length of 20 cm. Made, HTM-
100) was used to measure the load at break 10 times, and the average value was taken as the tensile strength.

Elongation at break (%): Elongation at break is JIS-P8
According to No. 132, the maximum tensile strain rate shown until the test piece broke was measured 10 times in the above-mentioned tensile strength test, and the average value was expressed as a percentage, which was taken as the breaking elongation.

Specific surface area (m ² / g): The specific surface area was measured by a nitrogen adsorption method using a specific surface area pore distribution analyzer (manufactured by Shimadzu Corporation, Accusorb 2100-02).

Loss of activated carbon fiber: The loss of activated carbon fiber was evaluated when the activated carbon fiber sheet was strongly shaken or touched with a hand, and the activated carbon fiber did not drop at all and could not be attached to the hand. ◎, the activated carbon fiber did not drop, but ○ when it was slightly attached to the hand, Δ when the activated carbon fiber dropped and was considerably attached to the hand, Δ, the activated carbon fiber was severely dropped, and the hand was stained black The case was marked as x.

Examples 1 and 2 As the activated carbon fiber layer, activated carbon fibers (average fiber diameter 15
μm, fiber length 8 mm, specific surface area 1000 m ² / g) and organic fiber (polyethylene terephthalate fiber having a fineness of 0.15 denier and fiber length of 7.5 mm) of 40/6
0 (Example 1), 60/40 (Example 2), and a slurry prepared from polyethylene terephthalate fibers having a fineness of 1.5 denier and a fiber length of 20 mm as the organic fiber layer. total dry weight preparative, and the combined paper making with two cylinder paper machine by a wet sheeting method, dry weight dry weight and the activated carbon fiber layer of 35 g / m ² is composed of an organic fiber layer of 15 g / m ² A wet paper web having a width of 50 g / m ² and a width of 50 cm was produced. The wet paper web was placed on a 100 mesh stainless wire porous support,
At a conveying speed of 7 m / min, high-pressure columnar water was first applied from the organic fiber layer side by a hydroentangling method, and the organic fibers constituting both layers of the activated carbon fiber layer and the organic fiber layer were intercalated with the activated carbon fiber, The activated carbon fiber layer and the organic fiber layer were integrated by three-dimensionally intertwining. Two nozzle heads are used,
The nozzle of the first head has a nozzle diameter of 120 μm, the nozzle spacing is 0.6 mm, the water pressure is 100 kg / cm ^{2 in} two rows, and the nozzle of the second head has a nozzle diameter of 100 μm and a nozzle spacing of 0.3.
mm, water pressure is 125 kg / cm ² in one row. The hydroentanglement was performed on one side first, and then on the back side under the same conditions. The confounding sheet obtained in this way is aired at 100 degrees.
It was dried with a dryer to obtain an activated carbon fiber sheet. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 1.

Example 3 As the activated carbon fiber layer, 60 parts of the activated carbon fiber used in Example 1 and a fineness of 0.5 denier (fiber diameter 7.2 μm) were used.
m), 40 parts of polyethylene terephthalate fiber having a fiber length of 10 mm is blended to form an organic fiber layer having a fineness of 0.15.
An activated carbon fiber sheet was obtained in the same manner as in Example 1 except that polyethylene terephthalate fiber having a denier (fiber diameter of 3.9 μm) and a fiber length of 7.5 mm was used. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 1.

Example 4 As an activated carbon fiber layer, 80 parts of the activated carbon fiber used in Example 1 and a fineness of 0.15 denier (fiber diameter 3.9 μm) were used.
m), polyethylene terephthalate fibers having a fiber length of 7.5 mm were mixed in 20 parts, and the fineness of 0.1 was obtained as an organic fiber layer.
An activated carbon fiber sheet was obtained in the same manner as in Example 1 except that polyethylene terephthalate fiber having 5 denier (fiber diameter of 3.9 μm) and fiber length of 7.5 mm was used. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 1.

Example 5 As an activated carbon fiber layer, 80 parts of the activated carbon fiber used in Example 1, polyethylene terephthalate having a fineness of 3 denier and a fiber length of 10 mm and polypropylene were used as components.
When 6 parts are divided, 20 parts of the peelable split conjugate fiber that generates an ultrafine fiber on average of 0.2 denier is blended, and the above-mentioned peelable split conjugate fiber is used as the organic fiber layer.
An activated carbon fiber sheet was obtained in the same manner as in Example 1. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 1.

Example 6 As an activated carbon fiber layer, 90 parts of the activated carbon fiber used in Example 1 and 10 parts of the peelable split conjugate fiber used in Example 5 were blended, and as an organic fiber layer, Example 5 was used. The activated carbon was prepared in the same manner as in Example 1 except that the release-type split conjugate fiber used in Example 3 was used, and three cylinder paper machines were used so that organic fiber layers could be provided on both sides of the activated carbon fiber layer. Fiber sheet
Got Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 1.

Comparative Example 1 The same as Example 6 except that 95 parts of the activated carbon fiber used in Example 1 and 5 parts of the peelable split conjugate fiber used in Example 5 were blended as the activated carbon fiber layer. The activated carbon fiber sheet having organic fiber layers provided on both sides of the activated carbon fiber layer by the method of
Got Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 2.

Comparative Example 2 As the activated carbon fiber layer, 60 parts of the activated carbon fiber used in Example 1 and a fineness of 0.15 denier (fiber diameter 3.9 μm) were used.
m) and 40 parts of polyethylene terephthalate fiber having a fiber length of 3 mm, and as an organic fiber layer, a polyethylene terephthalate fiber having a fineness of 0.15 denier (fiber diameter of 3.9 μm) and a fiber length of 3 mm. An activated carbon fiber sheet was obtained in the same manner as in Example 1 except that was used. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 2.

Comparative Example 3 As the activated carbon fiber layer, 60 parts of the activated carbon fiber used in Example 1 and a fineness of 0.15 denier (fiber diameter 3.9 μm) were used.
m), and 40 parts of polyethylene terephthalate fiber having a fiber length of 3 mm, and as an organic fiber layer, a polyethylene terephthalate having a fineness of 0.15 denier (fiber diameter of 3.9 μm) and a fiber length of 7.5 mm. An activated carbon fiber sheet was obtained in the same manner as in Example 1 except that the tow fiber was used. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 2.

Comparative Example 4 As an activated carbon fiber layer, 60 parts of the activated carbon fiber used in Example 1 was used, and as an organic fiber, a polyethylene terefin having a fineness of 0.15 denier (fiber diameter 3.9 μm) and a fiber length of 10 mm. The same as in Example 1, except that 40 parts of the tareta fiber was blended and polyethylene terephthalate fiber having a fineness of 0.15 denier (fiber diameter of 3.9 μm) and a fiber length of 10 mm was used as the organic fiber layer. An activated carbon fiber sheet was obtained by the method of. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 2.

Comparative Example 5 As the activated carbon fiber layer, 60 parts of the activated carbon fiber used in Example 1 was used as the fibrous binder, and the fusion temperature was 110.
40 parts of a core-sheath type polyester binder fiber (Melty-4080, 2 denier x 5 mm, manufactured by Unitika Ltd.) is blended, and as a organic fiber layer, the core is polypropylene and the sheath is ethylene vinyl alcohol. Heat-fusible composite fiber (NBF fiber, E type, 2 denier x) which is a copolymer
5 mm, manufactured by Daiwa Boshoku Co., Ltd.
Drying weight is 35g /
dry weight and the activated carbon fiber layer of m ² was produced the wet paper composite web width 50cm consisting of organic fiber layer of 15 g / m ^2.
After pressing the composite web of wet paper, a cylinder of 120 degrees
It was dried using a dryer to obtain an activated carbon fiber sheet. Various tests were conducted on this activated carbon fiber sheet. The results are shown in Table 2.

[0040]

[Table 1]

[0041]

[Table 2]

As shown in Table 1, the activated carbon fiber sheet of the present invention has the fibrous binder shown in Comparative Example 5 of Table 2.
Compared to the sheet made of sheet, the activated carbon fiber is contained up to 90% by weight, and the organic fibers constituting both the organic fiber layer and the activated carbon fiber layer surround the activated carbon fiber. , Intervening, three-dimensionally intertwined,
Almost no drop of activated carbon fiber occurs, and tensile strength and elongation at break are very large. Further, the specific surface area of the sheet shows a value almost close to a value theoretically obtained from the specific surface area of the activated carbon fiber, which shows that the characteristics of the activated carbon fiber are not impaired.

Comparing Examples 4 and 5 in Table 1, when the cross-sectional shape of the organic fiber is a fan-shaped modified cross-sectional shape rather than a circular shape, the fiber has corners, so that the activated carbon fiber is caught. And the activated carbon fiber did not drop off easily.

From Example 6 in Table 1, even if 90% by weight of the activated carbon fiber of the activated carbon fiber layer is blended, by providing the organic fiber layer using the peelable split fibers on both sides of the activated carbon fiber layer, It was possible to prevent the activated carbon fibers from falling off.

On the other hand, as shown in Comparative Example 1 in Table 2, when the blending amount of the activated carbon fibers in the activated carbon fiber layer exceeds 90% by weight, the peelable split fibers are used on both sides of the activated carbon fiber layer. Even if an organic fiber layer is provided, during the first hydroentanglement,
The organic fibers in both layers cannot fully surround and capture the activated carbon fibers, and the activated carbon fibers are washed away by the high-pressure pouring water flow, the basis weight is reduced, and the activated carbon fibers are reduced by the reduced amount of the activated carbon fibers. The specific surface area of the sheet became smaller.

As shown in Comparative Example 2 in Table 2, even when the content of the activated carbon fiber is 90% by weight or less, when the aspect ratio of the organic fiber is smaller than 1000, the organic matter of the activated carbon fiber layer and the organic fiber layer is Since the fiber surrounds the activated carbon fiber and can hardly be trapped, the activated carbon fiber is more likely to fall off, and since the organic fibers in both layers are hardly entangled with each other, the tensile strength and the breaking elongation are significantly weakened. It was Similarly, as shown in Comparative Example 3 in Table 2, the aspect ratio of the organic fibers constituting the activated carbon fiber layer is 100.
When it is less than 0, the aspect ratio of the organic fiber layer is 100.
Even if an organic fiber having a small fiber diameter of 0 to 2500 is used, the organic fiber of the organic fiber layer cannot sufficiently surround and capture the activated carbon fiber during the first hydroentanglement,
Activated carbon fibers run off. Further, in the activated carbon fiber sheet, since the activated carbon fiber layer and the organic fibers constituting the organic fiber layer are not well entangled with each other, the tensile strength and the elongation at break are small, and strain occurs inside the sheet, -There was waviness on the toe.

As shown in Comparative Example 4 of Table 2, when the aspect ratio of the organic fibers constituting the activated carbon fiber layer and the organic fiber layer exceeds 2500, it becomes very difficult to disperse the organic fibers in both layers. Since unevenness such as twisting and lumps occurs,
Although the activated carbon fibers did not drop off much, the formation of the sheet was very poor, and the tensile strength was weaker than that of Example 2.

[0048]

The activated carbon fiber sheet of the present invention has an aspect ratio of 1 to 10 to 90% by weight of activated carbon fiber.
An activated carbon fiber layer composed of 90 to 10% by weight of an organic fiber of 000 to 2500 and an aspect ratio of 1000 to 25
And an organic fiber layer made of an organic fiber of 00, the organic fibers constituting both layers of the activated carbon fiber layer and the organic fiber layer are entwined three-dimensionally with the activated carbon fiber interposed therebetween,
Since the activated carbon fiber layer and the organic fiber layer are integrated,
Excellent tensile strength and elongation at break. As a result, the sheet has excellent workability for various uses, and can be used particularly in a portion to which a large stress is applied, and the sheet has an extremely wide range of applications.

Further, the method for producing an activated carbon fiber sheet of the present invention comprises an activated carbon fiber layer comprising 10 to 90% by weight of activated carbon fibers and 90 to 10% by weight of organic fibers having an aspect ratio of 1000 to 2500. , Aspect ratio is 1000
A composite web having an organic fiber layer composed of organic fibers of about 2,500 is formed by a wet papermaking method, and the organic fibers constituting both the activated carbon fiber layer and the organic fiber layer are activated carbon by a hydroentangling method. The sheets are three-dimensionally intertwined with fibers interposing them to integrate both layers, so the sheet is uniform,
It is possible to obtain an activated carbon fiber sheet having a high degree of adsorption capacity with very little loss of the activated carbon fiber, without impairing various performances of the activated carbon fiber.

Claims (4)

[Claims] 1. The ratio (L / D, aspect ratio) of 10 to 90% by weight of activated carbon fiber, fiber length L and fiber diameter D is 1000.
An activated carbon fiber layer composed of 90 to 10% by weight of an organic fiber having an aspect ratio of 1000 to 2500 and an organic fiber layer having an aspect ratio of 1000 to 2500 on one or both sides of the activated carbon fiber layer. The organic fibers constituting the both layers of the organic fiber layer and the activated carbon fiber layer are three-dimensionally entangled by the hydroentanglement method with the activated carbon fibers interposed therebetween, and the activated carbon fiber layer and the organic fiber An activated carbon fiber sheet characterized in that a fiber layer is integrated. 2. The activated carbon fiber layer has an organic fiber diameter of 9 μm.
The activated carbon fiber sheet according to claim 1, which has a m or less. 3. The activated carbon fiber sheet according to claim 1, wherein the organic fiber has a modified cross-section. 4. Organic fibers 90 to 10 having 10 to 90% by weight of activated carbon fibers and an aspect ratio of 1000 to 2500.
A slurry having a weight% of water dispersed therein and an aspect ratio of 10
Slurry in which organic fiber of 0 to 2500 is dispersed in water
By a wet papermaking method to form a composite web in which an organic fiber layer is provided on one or both sides of an activated carbon fiber layer, and then the composite web is subjected to a hydroentangling method. Then, a high-pressure columnar water stream is applied from the organic fiber layer side, and the organic fibers constituting both layers of the organic fiber layer and the activated carbon fiber layer are three-dimensionally entangled with the activated carbon fiber interposed therebetween, A method for producing an activated carbon fiber sheet, characterized by integrating a fiber layer and the activated carbon fiber layer.