JPH0824638A - Molded adsorbing element - Google Patents

Abstract

PURPOSE:To enhance the strength of both inner and outer peripheral corners and to make it hard to receive a damage such as breakage as compared with a conventional molded adsorbing element, in a molded adsorbing element of which the outer and inner peripheral surfaces are respectively coated with a coating film having filter function, by coating at least the outer peripheral edge corners of the end surfaces thereof with the coating film. CONSTITUTION:A main body 1 is arranged in parallel to the almost central part of the edge of the longitudinal side 8 of an outer peripheral surface coating film 7 wherein a generatrix is developed and both side edges of the coating film 7 are set to a state almost equally protruding toward both end surfaces 5, 5 of the main body 1. The coating film 7 is wound around the outer peripheral surface 4 of the main body 1 by flat winding while tensile force is slightly applied to the coating film in the peripheral direction thereof a region 8a where both edges of the coating film are almost parallelly overlapped slightly along the longitudinal sides 9 of thermally fused. When the regions near the lateral sides 9 the coating film 7 protruding toward both end surfaces 5 of the main body 1 are inwardly bent to be pressed and fused to the end surfaces 5 by a hot iron, the coating film 7 partially overlaps one another in a pleated state to be fused to the end surfaces 5 to cover them. By this constitution, the outer peripheral surface of the main body 1 and the outer peripheral edge corners 6 of the end surfaces 5 are covered with one coating film 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded adsorbent used for adsorbing and removing a coloring substance, an odorous component, and other harmful substances contained in a liquid phase or a gas phase, and more particularly to purified water. The present invention relates to a molded adsorbent used as a filter (activated carbon element) or the like in a vessel or a solvent recovery device.

[0002]

2. Description of the Related Art As a typical example of this type of molded adsorbent, there is a cylindrical adsorbent having a predetermined wall thickness as shown in FIG. This one is loaded (installed) in a water purifier, for example.
Then, water is passed from the outer peripheral surface to the inner peripheral surface (in the radial direction) to adsorb harmful substances with activated carbon, etc., and the water after removal is supplied to the secondary side through the hollow inside. . The arrows in the figure indicate the flow of water. At this time, it is necessary to prevent fine powder such as activated carbon separated from the inner peripheral surface from mixing (flowing out) into the water supplied to the secondary side, and as a pre-filter, relatively coarse foreign matter In order to prevent this from happening in advance and to maintain the external appearance, in this type of cylindrical molded adsorbent, the inner and outer peripheral surfaces 52, 54 of the main body 51 have a predetermined filterability such as a filter cloth. The covering films 53 and 57 are attached so as to be in close contact with each other,
The inner and outer peripheral surfaces are covered.

And, in such a shaped adsorbent,
It is possible to prevent a situation in which the fluid (water) that has entered from the outer peripheral surface 54 near the end surface 55 of the main body 51 does not pass in the radial direction (thickness direction) but flows out from the end surface 55 as it is and is not sufficiently filtered. It is necessary to secure the flow (passage) of the fluid from the outer peripheral surface 54 to the inner peripheral surface 52. Therefore, in general, as shown in FIG.
2, 54 and 54 are covered with the coating films 53 and 57, the end face 55
Further, a cap Ca made of synthetic rubber or synthetic resin having an L-shaped (or U-shaped) cross section on one side was attached without a gap, and the end face 55 was closed.

[0004]

In the molded adsorbent having the above-mentioned conventional activated carbon as a component, the outer peripheral edge of the end face 55 (intersection between the end face 55 and the outer peripheral face 54) is handled during the handling in the manufacturing process and the like. Since the ridges 56 and the like project outward, it is easy to hit an object and receive an external force. For this reason, since the end surface 55 is not covered before the cap is attached, there is a problem that the outer peripheral edge corner 56 is likely to be chipped or cracked.

Further, the end surface 55 of the coating film 57 on the outer peripheral surface 54.
The part (edge) closer to the main body 51 is rarely completely adhered to the main body 51.
When the cap Ca is pushed in as shown by the arrow in FIG. 13 when the cap Ca is fitted (installed) after the covering of 54, the inner surface angle Ck of the cap Ca having the L-shaped cross section covers the outer peripheral surface 54. There is a problem that it is difficult to fit because the edge of the film 57 near the end surface 55 and the outer peripheral edge corner 56 of the end surface 55 are hit or caught, and the outer peripheral edge corner 56 is likely to be chipped or cracked. Further, in the case where the cap has a U-shaped cross section (not shown), the inner peripheral edge corner 66 of the end surface 55 of the molded adsorbent will also be hit in the same manner.

As described above, in the above-mentioned conventional molded adsorbent, the peripheral edge angle of the end face 55, especially the outer peripheral edge angle 56 is apt to be chipped during the handling process of the manufacturing process thereof, which leads to deterioration of quality and yield. There was a problem. The present invention aims to solve such a problem.

[0007]

In order to achieve the above object, the first means of the present invention is a shaped adsorbent which is formed into a tubular shape containing activated carbon as a component, and the outer peripheral surface thereof. The inner peripheral surface and the inner peripheral surface are each coated with a coating film having filterability, and at least the outer peripheral edge angle of the end face is coated with the coating film. In this case, it is preferable that the coating film that covers the outer peripheral edge corner be integrally formed with the coating film that covers the outer peripheral surface.

The second means according to the present invention is a shaped adsorbent formed by including activated carbon as a component into a cylindrical shape, and the outer peripheral surface and the inner peripheral surface of the adsorbent have a filterability. What is covered with a covering film is that the outer peripheral edge angle and the inner peripheral edge corner of the end face are covered with a covering film. In this case, it is preferable that the coating film that covers the outer peripheral edge corner and the inner peripheral edge corner is integral with the coating film that covers the outer peripheral surface.

In any of these means, it is preferable that the molded adsorbent body is chamfered at the outer peripheral edge corner of its end face.

[0010]

In the first means, since the outer peripheral edge corner of the end face is covered with the coating film, the strength of the outer peripheral edge corner is higher than that of the conventional molded adsorbent in which this portion is not covered. Is improved and is less susceptible to damage such as chipping. Further, since the outer peripheral edge corners are covered with the coating film, the cap can be easily fitted to that extent, and moreover, it is effective in preventing the occurrence of chips and the like. In this case, the number of parts (coating film) is not increased in the case where the coating film that covers the outer peripheral edge corner is formed integrally with the coating film that covers the outer peripheral surface.

Further, in the second means, since both the inner and outer peripheral edge corners of the end face are covered, the strength of both the inner and outer peripheral edge corners is improved as compared with the conventional molded adsorbent body in which both end portions are not covered. However, it is less susceptible to damage such as chipping. Further, since both the inner and outer peripheral corners are covered, it is easy to fit even a cap of a U-shaped cross section that covers both corners, and it is effective in preventing the occurrence of chipping at both corners. Also in this case, if the coating film that covers the inner and outer peripheral edge corners is integral with the coating film that covers the outer peripheral surface, the number of parts (coating film) does not increase. .

[0012] In these techniques, such an effect is more significant in the case where the outer peripheral edge corner of the end face is chamfered.

As described above, the molded adsorbent according to the present invention is effective in preventing damage to the outer peripheral edge corners or the inner and outer peripheral edge corners of the end surface of the molded adsorbent during the handling in the manufacturing process thereof, and its quality. At the same time, yield improvement is expected.

[0014]

Next, some embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 are molded adsorbents for water purifiers embodying the first means of the present invention. In FIG. 1, reference numeral 1 is a cylinder made of activated carbon, a predetermined binder and the like by a wet suction method described later. Shaped adsorbent body (hereinafter also referred to as body)
The inner peripheral surface 2 is covered with a cylindrical coating film (also referred to as an inner peripheral surface coating film or simply a coating film) 3 on its entire surface. However, in this example, the inner peripheral surface coating film 3 is made of a non-woven fabric made of polyethylene fiber having filterability. Then, a coating film 7 made of a non-woven fabric of the same material is adhered to a portion of the outer peripheral surface 4 and both end surfaces 5 and 5 including the outer peripheral edge corner 6 (a portion near the outer peripheral edge corner of the end surface 5). The outer peripheral portion of No. 5 is covered. However, a coating film (also referred to as an outer peripheral surface coating film or simply a coating film) 7 that covers the outer peripheral surface 4 and the end surface 5 has a rectangular sheet shape, and the vertical side 8 is a bus bar of the main body 1. It is slightly longer (about 10 mm in this example) than the length, and the lateral side 9 is slightly longer than the circumferential length (circumferential length) of the outer peripheral surface 4, and is covered with the following.

That is, the main body 1 is arranged so that its generatrix is parallel to approximately the center of the vertical edges 8 of the expanded outer peripheral surface coating film 7, and both lateral edges of the coating film 7 are arranged. It is assumed that the main body 1 is projected (stretched) almost uniformly on both end surfaces 5, 5 side.
However, the inner peripheral surface 2 is coated with a coating film 3 formed in a tubular shape on the entire surface in advance. Next, the coating film 7 is wound around the outer peripheral surface 4 of the main body 1 by so-called flat winding while applying a slight tensile force in the circumferential direction, and both edges along the vertical sides 8 and 8 are substantially parallel and slightly overlap each other. The portion 8a is bonded by heat fusion at about 130 ° C. After that, the portion of the coating film 7 projecting to the both end surfaces 5 and 5 side of the main body 1 close to the lateral side 9 (each end surface side about 5 mm) is bent inward so as to follow the end surface 5, and the end surface is heated with a heat iron. When pressing against 5 and heat fusion,
As shown in FIG. 2, the end face 5 is covered with the coating film 7 which is partially folded in a pleat shape and fused. Thus,
The outer peripheral surface 4 and the end surface 5 have an outer peripheral edge angle 6 formed by a single coating film 7.
Are coated.

On the inner peripheral surface 2 of the molded adsorbent body 1,
Although it is assumed that the entire surface thereof is coated with the coating film 3 formed in a tubular shape in advance, such a main body 1 is manufactured as follows by a wet suction method, for example. That is, first,
Predetermined activated carbon such as fibrous activated carbon and a binding material (binder)
And the like are mixed to prepare a uniform aqueous slurry.
On the other hand, the inner peripheral surface 2 of the molded adsorbent body 1 to be manufactured and a cylindrical molding die having the same outer diameter and a large number of water passage holes on the surface are immersed in this liquid. However, the above-mentioned tubular coating film 3 made of non-woven fabric is previously fitted and inserted on the outer peripheral surface of the molding die. Then, a predetermined amount of solid content is laminated on the outer peripheral mold surface by a suction method, taken out from the liquid, dehydrated to form a wet (wet) shaped body, taken out from the molding die, and dried ( The activated carbon is bonded and dried by heating it to a predetermined temperature in a state of being loaded in a mold and melting the binder by heat. Thus, the main body 1 in which the inner peripheral surface 2 is coated (adhered) with the coating film 3 is obtained.

In the molded adsorbent of the present example obtained as described above, since the outer peripheral edge corners 6 of both end surfaces 5 and 5 are covered with the coating film 7, an impact load is applied to the corners. Even so, since it is covered, the strength is high and chipping or cracking is unlikely to occur. Further, even if a chip or the like is caused, since it is covered with the coating film 7, it does not flow out of the coating film 7 as it is. Further, as shown in FIG. 3, the molded adsorbent has a cap C having an L-shaped cross section on one side.
When the outer peripheral edge corner 6 is covered with a, since the outer peripheral edge corner 6 is covered, there is little catching, the fitting is easy, and chipping at that time is unlikely to occur. In this example, the outer peripheral surface 4 and the end surface 5 are one (integrated) coating film 7
Since the coating is performed with this, the number of parts does not increase. Incidentally, in this example, the end surface 5 is coated inward (center direction) from the outer edge corner 6 by about 5 mm, but this size, that is, the size of the coating film 7 may be set appropriately.

FIG. 4 is an embodiment in which the outer peripheral edge corner 6 of the end surface 5 of the molded adsorbent body 1 in the embodiment shown in FIG. 1 is chamfered (45 ° chamfer in the figure). If you do this,
The strength of the outer edge corner 6 is further improved. Further, the chamfer serves as a guide when the above L-shaped cap Ca is attached, so that it is easy to fit. Of course, chamfering may be round chamfering instead of inclined chamfering. In addition,
The chamfer size (45 ° chamfer, arc radius, etc.) may be set according to the size of the molded adsorbent.

FIG. 5 shows an embodiment which should be referred to as a modification of the above-mentioned first means, in which the coating film for coating the outer peripheral surface 4 and the end surface 5 of the main body 1 is provided separately. Since they are basically the same as those described above, only the differences will be described and the same portions will be denoted by the same reference numerals. The same applies to the following examples. That is, in the structure shown in FIG. 5, the outer peripheral surface 4 of the main body 1 is covered with the coating film 17 which covers only the outer peripheral surface 4, and the end surface 5 is formed separately from the coating film 17 in a L-shaped cross section on one side. By coating with 10, the outer edge corner 6 of the end face 5 is coated. In this case, the attachment may be performed by heat fusion or an adhesive agent at a portion of the coating film 17 covering the outer peripheral surface 4 of the main body 1 near the end surface 5 of the main body 1. In this case, the other coating film 10 may be made of a material having no filterability, unlike the coating film 17 covering the outer peripheral surface 4, although the filtration area is slightly reduced. As shown in FIG. 6, it is assumed that the outer peripheral edge angle 6 of the end face 5 of the main body 1 is chamfered such as a 45 degree chamfer, and the end face 5 is covered with another coating film 11 that is in close contact with it. May be. By doing so, the strength is improved due to the chamfering at the outer peripheral corner 6.

FIGS. 7 and 8 show a shaped adsorbent which embodies the second means of the present invention. In FIG. 1, reference numeral 1 denotes activated carbon and a predetermined binder as components, in the same manner as described above. It is a molded adsorbent body formed in a cylindrical shape, and the inner peripheral surface 2, the outer peripheral surface 4, and the outer peripheral edge angles 6 and 16 of the both end surfaces 5, 5 are covered with the same non-woven fabric as described above. It is a thing. However, the outer peripheral edge 6 and the inner peripheral edge 16 of the outer peripheral surface 4 and the both end surfaces 5 and 5 are covered as follows.

A coating film (also referred to as an outer peripheral surface coating film or simply a coating film) 27 for coating the outer peripheral surface 4, the outer peripheral edge corners 6 and the inner peripheral edge corners 16 of both end surfaces 5, 5 is a rectangular sheet. The vertical side 28 has the length of the bus bar of the main body 1 and the thickness t
Slightly smaller than the one with twice the size (10 mm in this example)
The length of the lateral side 29 is slightly longer than the circumferential length (circumferential length) of the outer peripheral surface 4 and is covered with the following.

That is, the main body 1 is arranged so that its generatrix is parallel to the substantially center of the vertical side 28 of the expanded coating film 27, and both lateral sides 29 of the coating film 27 are arranged on the main body 1. Both ends 5 and 5 are projected (protruded) almost evenly.
However, in the same manner as above, the inner peripheral surface 2 is coated with the coating film 3 formed in a tubular shape on the entire surface in advance. Next, while applying a slight tensile force to the coating film 27 in the circumferential direction,
The outer peripheral surface 4 of the main body 1 is wound by so-called flat winding, and both edges along the vertical sides 28, 28 are made substantially parallel to each other and the slightly overlapped portion 28a is bonded by heat fusion at about 130 ° C.
After that, the portion of the coating film 27 projecting to the both end surfaces 5 and 5 side of the main body 1 is bent inward so as to follow the end surface 5 in the same manner as described above, and the end surface is bent with a heat iron. It is pressed against 5 and heat-sealed. And, the side 29
The bent portion (about 5 mm on each end surface side) is bent so as to be pressed against the end surface 5 of the inner peripheral surface 2 and is pressed against the coating film 3 on the inner peripheral surface 2 by a thermal iron in the same manner to be heat-sealed. Thus,
The outer peripheral surface corner 4 and the inner peripheral surface corner 16 of the outer peripheral surface 4 and the end surface 5 are covered with one (integrated) coating film 27.

The molded adsorbent obtained as described above is
Since the outer peripheral edge corners 6 and the inner peripheral edge corners 16 of the both end surfaces 5 and 5 are covered with the coating film 27, even if an impact load is applied to the both corners, the strength is high because they are covered together. , Chipping and cracking are less likely to occur. Further, even if a chip or the like is caused, since it is covered with the coating film 27, it does not flow out of the coating film 27.

When the inner and outer peripheral edge corners are covered with a cap Cb having a U-shaped cross section on one side as shown in FIG. 8, not only the outer peripheral edge corner 6 but also the inner peripheral edge corner 16 are covered. Fitting is easy, and chipping at that time is unlikely to occur. In this case, the length L of the outer peripheral surface coating film 27 covering the inner peripheral edge corner 16 along the generatrix (axis) direction on the inner peripheral surface 2 side is set to be slightly smaller than the length covered by the U-shaped cap Cb. It is good to put it. If you do this,
This is because the edge of the coating film 27 that covers the inner peripheral edge corner 16 is covered with the cap. Also in this example, since the outer peripheral surface 4 and the end surface 5 are covered with the single (integrated) coating film 27, the number of parts is not increased.

FIG. 9 shows an outer peripheral edge corner 6 and an inner peripheral edge corner 16 of the end surface 5 of the molded adsorbent body 1 in the embodiment shown in FIG.
Is an example in which a chamfer (45 ° chamfer is shown) is attached. By doing so, the strength of the outer peripheral edge corner 6 and the inner peripheral edge corner 16 is improved. Further, the chamfer serves as a guide when the above-mentioned U-shaped cap Cb is attached, so that it is easy to fit.
Of course, chamfering may be round chamfering instead of inclined chamfering. The size of the chamfer (4
5 degree chamfering, arc radius, etc.) may be set according to the size of the molded adsorbent. In FIG. 9, the inner and outer peripheral edge corners are chamfered, but only the outer peripheral edge corner 6 that is easily damaged may be chamfered.

Incidentally, FIG. 10 shows an embodiment which should be called a modification of the above-mentioned second means, and the outer peripheral surface 4 and the end surface 5 of the main body 1 are shown.
This is an example in which the coating films for coating are different from each other, but since they are basically the same as those described above, only the differences will be described and the same portions will be denoted by the same reference numerals. That is, FIG.
In No. 0, the outer peripheral surface 4 of the main body 1 is coated with a coating film 37 that covers only the outer peripheral surface 4, and the end surface 5 is separately coated with another coating film 30 formed in a U-shaped cross section on one side. By doing so, the outer peripheral edge corner 6 and the inner peripheral edge corner 16 of the end face 5 are covered. In this case, the attachment is carried out by heat fusion or by using the coating films 37, 3 covering the outer peripheral surface 4 and the inner peripheral surface 2 of the main body 1 or a part of the coating film near the end surface 5 of the main body 1. It may be adhered by an appropriate means such as an adhesive. In this case, the other coating film 30 reduces the filtration area to some extent, but unlike the coating film 37 that coats the outer peripheral surface 4,
It is also possible to use a material having no filterability. Also in this case, as shown in FIG. 11, the outer peripheral edge angle 6 and the inner peripheral edge angle 16 of the end surface 5 of the main body 1 are assumed to be chamfered such as a 45 degree chamfer, and the shape to be in close contact therewith You may coat with another coating film 31 of. Note that chamfering may be applied only to the outer peripheral corners 6 that are easily damaged.

In the above description, the coating method for the coating film on the outer peripheral surface is flat winding, but the coating means is not limited in the present invention. The coating film in the form of a band with a predetermined width is spirally wound while slightly overlapping the part on that side, and the overlapping part is bonded, and then the outer peripheral edge corner of the end surface of the main body is adhered in the same manner as described above. Alternatively, the outer edge corner and the inner edge corner may be covered. Further, it may be a multi-layer winding having two or more layers regardless of the flat winding or the spiral winding. By doing so, the strength of the outer peripheral edge corner or the inner peripheral edge corner can be further increased accordingly. In the above, the inner peripheral surface is formed by a coating film formed in a cylindrical shape in advance,
Although the coating was performed simultaneously during the molding process of the main body by the wet suction method, the present invention is not limited to this.

When the coating film is wound and the overlapping portions thereof are adhered, an adhesive may be used instead of heat fusion. The same applies to the overlapping portion when covering the outer peripheral edge corner and the inner peripheral edge corner of the end face. Further, when covering the outer peripheral edge corner (and inner peripheral corner) of the end surface, in the above, it was bent and pressed against the end surface (and inner peripheral surface), and the coating film was heat-sealed, but room temperature bonding may also be used, Fine powder (adhesive) such as polyethylene may be interposed and heat-melted to adhere. And in these, you may adhere | attach spotwise, without adhering the whole surface of overlap. In addition, the coating of the outer peripheral edge (and the inner peripheral edge) may be in a state in which the coating film is pressed against the end surface without being adhered to the end surface.

The coating film for coating the inner peripheral surface and the outer peripheral surface of the molded adsorbent body may be any material and composition having a predetermined filterability, and in addition to the non-woven fabric made of polyethylene fiber in the above embodiment, polypropylene fiber. A non-woven fabric made of, a non-woven fabric made of polyester fibers, a non-woven fabric made of rayon fibers, a non-woven fabric made of aramid fibers, a non-woven fabric made of acrylic fibers, a non-woven fabric made of polyphenylene sulfide fibers, a non-woven fabric made of inorganic fibers such as glass fibers and alumina fibers, further A non-woven fabric made of a mixture of two or more kinds of these fibers or a paper non-woven fabric such as synthetic paper can be exemplified, but the non-woven fabric may be a non-woven fabric, and a woven fabric (or knitted fabric) of each of these fibers or two or more types A mixed woven fabric (knitting) may be used.

In the present invention, the molded adsorbent body may be produced by any method such as the one produced as follows instead of the above-mentioned wet suction method. That is, a sheet formed by laminating activated carbon, a heat-meltable synthetic resin (binder), etc. on the surface of a non-woven fabric having a predetermined width (strip) and having filterability is used as a core rod (cylinder) having a predetermined outer diameter. Shape) is wound into a cylindrical body while heating at a predetermined temperature so that the non-woven fabric side is in contact, and a cylindrical body is cut into an appropriate length, and the inner peripheral surface is coated with a coating film. It can also be a molded adsorbent body. After that, the outer peripheral surface and the end surface may be coated with the coating film in the same manner as described above. In the present invention, the outer peripheral edge corner and the inner peripheral edge corner are preferably coated on both end faces, but may be embodied only on one end face.

[Brief description of drawings]

FIG. 1 is an enlarged cutaway front view of an essential part of an embodiment embodying a first means of a molded adsorbent according to the present invention.

FIG. 2 is an enlarged view illustrating an end surface (flat surface) of the embodiment of FIG.

FIG. 3 is a cross-sectional view of a main part in which a cap having an L-shaped cross section on one side is attached to an end surface of the embodiment of FIG.

FIG. 4 is a cross-sectional view of an essential part of the molded adsorbent body with chamfered outer peripheral edge corners in the embodiment of FIG.

5 is a cross-sectional view of a main part of the embodiment of FIG. 1 in which the end surface is covered with a coating film which is separate from the coating film which covers the outer peripheral surface.

FIG. 6 is a cross-sectional view of a main part of the molded adsorbent body with chamfered outer peripheral edge corners in the embodiment of FIG. 5;

FIG. 7 is a cutaway front view showing an enlarged main part of an embodiment embodying the second means of the molded adsorbent according to the present invention.

8 is a cross-sectional view of a main part in which a cap having a U-shaped cross section on one side is attached to an end surface of the embodiment of FIG.

9 is a cross-sectional view of a main part of the molded adsorbent body with chamfered outer peripheral edge corners and inner peripheral edge corners in the embodiment of FIG.

10 is a cross-sectional view of a main part of the embodiment of FIG. 7 in which the end surface is covered with a coating film that is separate from the coating film that covers the outer peripheral surface.

11 is a cross-sectional view of a main part of the embodiment of FIG. 10, in which the outer peripheral edge corner and the inner peripheral edge corner of the end surface of the molded adsorbent body are chamfered.

FIG. 12 is a partially enlarged cutaway front view illustrating a conventional cylindrical shaped adsorbent.

FIG. 13 is a partial cross-sectional view in which a cap having a U-shaped cross section on one side is attached to an end surface of the molded adsorption body of FIG.

[Explanation of symbols]

 1 Molded Adsorbent Body 2 Inner Surface 3 Inner Surface Covering Film 4 Outer Surface 5 End Face 6 Outer Edge Corner 7, 17, 27, 37 Outer Surface Covering Film 16 Inner Edge Corner

Claims (5)

[Claims] 1. A molded adsorbent formed by including activated carbon as a component into a cylindrical shape, the outer peripheral surface and the inner peripheral surface of which are each covered with a filterable coating film, A molded adsorbent characterized in that at least an outer peripheral edge corner of its end face is covered with a coating film. 2. The molded adsorbent according to claim 1, wherein the coating film that covers the outer peripheral corners is integral with the coating film that covers the outer peripheral surface. 3. A molded adsorbent formed by containing activated carbon as a component into a cylindrical shape, the outer peripheral surface and the inner peripheral surface of which are each coated with a filterable coating film, A molded adsorbent characterized in that the outer peripheral edge corner and the inner peripheral edge corner of the end face are covered with a coating film. 4. The molded adsorbent according to claim 3, wherein the coating film that covers the outer peripheral edge corner and the inner peripheral edge corner is integral with the coating film that covers the outer peripheral surface. 5. The molded adsorbent according to claim 1, wherein the outer peripheral edge is chamfered.