JP2009261785A - Absorptive can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive can capable of suppressing occurrence of a wall current. <P>SOLUTION: The absorptive can 31 has a front face section 21 into which outside air flows in and a rear face section 22 from which filtered outside air can flow out and which is attached to a surface body. A space between the front face section 21 and the rear face section 22 is filled with a sorbent 32. At the front face section 21 or/and the rear face section 22, an annular shielding section 22b with which the sorbent 32 is covered partially is formed. The annular shielding section 22b has an outer annular section 81 and an inner annular section 82 and in one of the following modes (a, b, c): (mode a) a level difference 53 is formed so that a first clearance C<SB>1</SB>between the outer annular section 81 and the sorbent 32 are smaller than a second clearance C<SB>2</SB>between the inner annular section 82 and the sorbent 32; (mode b) a first annular rib is formed between the outer annular section 81 and the inner annular section 82, and a third clearance is formed between the first annular rib and the sorbent 32; and (mode c) a second annular rib is formed between the outer annular section 81 and the inner annular section 82, and a slit is formed at the second annular rib. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an absorption can suitable for being attached to a face body such as a gas mask and used for filtering toxic gas.

2. Description of the Related Art Conventionally, a cylindrical absorbent can attached to a face mask inlet of a gas mask and used to filter toxic outside air is known or well known. In addition, in an absorbent can filled with an adsorbent, a gap may be formed between the inner surface of the peripheral wall of the absorbent can and the adsorbent, and in such an can, most of the outside air flowing from the front of the absorbent can has a low resistance. It becomes a wall flow through the gap and goes to the rear surface of the absorber. In such an absorption can, the breakthrough of the adsorbent rapidly proceeds in the vicinity of the inner surface of the peripheral wall portion, and the lifetime ends even though there is still an adsorption power in the radial center of the absorption can. is there. Under such circumstances, the absorbent can disclosed in Japanese Patent Application Laid-Open No. 2005-2378090 (Patent Document 1) is configured so that a narrow air-impermeable member is attached to the upstream side of the inner surface of the peripheral wall portion, thereby causing a wall flow and it. This prevents the breakthrough that occurs.
Japanese Patent Laying-Open No. 2005-2378090

  In the absorbent can disclosed in Patent Document 1, the non-breathable member attached to the inner surface of the peripheral wall covers the adsorbent near the inner surface from the front side of the absorbent can, thereby substantially reducing the opening area for taking in outside air. There is something to do. Also, the adsorbent behind the non-breathable member and covered with this member may not be useful for the filtration of outside air.

  Then, this invention makes it the subject to provide the novel absorption can which can eliminate such a problem in the conventional absorption can.

  In order to solve the above-described problems, the present invention is directed to a front surface portion into which outside air flows, a rear surface portion that flows out after the outside air is filtered, and an intervening space between the front surface portion and the rear surface portion. A cylindrical container portion is formed by the non-breathable peripheral wall portion, the front-rear direction in which the container portion intersects the front surface portion and the rear surface portion, the radial direction orthogonal to the front-rear direction, and the peripheral wall portion The container portion is filled with an adsorbent for filtering the outside air, and the rear surface portion is formed to be attachable to a face piece.

In such an absorption can, the present invention is characterized as follows. The adsorbent has a front surface facing the inner surface of the front surface portion and a rear surface facing the inner surface of the rear surface portion. In the container portion, at least one of the front surface portion and the rear surface portion extends annularly in the circumferential direction in a state of being integrated with the peripheral wall portion, and any one of the front surface and the rear surface of the adsorbent. And an annular shielding portion that partially covers the adsorbent and a ventilation portion that is positioned inside the annular shielding portion in the radial direction. The annular shielding part in either the front part or the rear part has an outer annular part connected to the peripheral wall part and an inner annular part located inside the outer annular part in the radial direction, In the front-rear direction, there is a clearance between the adsorbent and the outer annular portion and the inner annular portion are in any of the following a, b, and c modes:
a. The outer annular portion has a first clearance that is part of the clearance with the adsorbent, while the inner annular portion has a second clearance that is part of the clearance with the adsorbent; A mode in which a step is formed between the outer annular portion and the inner annular portion so that the first clearance is smaller than the second clearance in the front-rear direction,
b. A first annular rib is formed between the outer annular portion and the inner annular portion so as to rise from the inner surface of the annular shielding portion toward the adsorbent and extend in the circumferential direction. A third clearance that is a part of the clearance that allows ventilation in the radial direction is formed between the adsorbent and the adsorbent;
c. Between the outer annular portion and the inner annular portion, a second annular rib is formed extending from the inner surface of the annular shielding portion toward the adsorbent and extending in the circumferential direction. A mode in which a slit that allows ventilation in the radial direction between the outer annular portion and the inner annular portion is intermittently formed in the circumferential direction as a part of the clearance.

  In one embodiment of the present invention, the container portion is formed by a front member including the front surface portion and the adsorbent, and a rear member including the rear surface portion to which the front member is detachably attached. The front member is formed with a support portion that contacts the rear surface of the adsorbent and supports the adsorbent from the rear of the front member so as to allow ventilation.

  In another embodiment of the present invention, the annular shielding portion formed on the rear surface portion of the rear member faces the rear surface of the adsorbent via the support portion.

  In the absorption can according to the present invention, the annular shielding portion formed on at least one of the front surface portion and the rear surface portion of the container portion has an outer annular portion and an inner annular portion, and the annular shielding portion is an outer annular shape. A mode (mode a) in which a step is formed so that the first clearance between the portion and the adsorbent is smaller than the second clearance between the inner annular portion and the adsorbent, the outer annular portion and the inner annular portion A first annular rib is formed between the first annular rib and the adsorbent, and a third clearance is formed between the first annular rib and the adsorbent, and a first annular rib is formed between the outer annular portion and the inner annular portion. Two annular ribs are formed, and slits are intermittently formed in the second annular rib in the circumferential direction (aspect c). When the annular shielding part in any of these aspects a, b, and c is formed on the front part of the container part, the outside air entering the front part has a first clearance and a third flow path toward the peripheral wall part. Since it is narrowed by either the clearance or the slit, the generation of wall flow in the absorber can be suppressed. When the annular shielding part in any one of these modes a, b, and c is formed on the rear surface part of the container part, the outside air that has entered the front part of the absorber can flow toward the rear surface part as a wall flow. Since the outside air is narrowed by any of the first clearance, the third clearance, and the slit, the flow from the peripheral wall portion of the absorption can to the central portion of the absorption can is suppressed. it can.

  The details of the absorbent can according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view of the face piece 1 showing an example of a usage pattern of the absorption can 20. The face body 1 has a face opening member 3 and a lace 4 that cover the face of a wearer (not shown), and the face opening member 3 includes a shield 6 formed of a transparent plastic material. An absorption can 20 is attached to an intake port 19 formed in the front portion of the face opening member 3 in a separable state. When the wearer of the face body 1 breathes, the outside air enters from the front surface portion 21 of the absorption can 20 and is absorbed and removed from the toxic components contained in the outside air to become filtered outside air. It flows out toward the inside of the member 3 and reaches the wearer's mouth.

  FIG. 2 is a perspective view of the absorption can 20. The illustrated can 20 has a cylindrical shape, and includes a front portion 21 into which outside air flows, a rear portion 22 (see FIG. 3) that flows out after the flowing outside air is filtered, a front portion 21 and a rear portion 22. And a non-breathable peripheral wall portion 23 interposed therebetween. The front surface portion 21 includes a front annular shielding portion 27a partially covering the adsorbent 32 (see FIG. 3) of the absorbent can 20 from the front, and a ventilation portion 27b defined on the inside by the front annular shielding portion 27a. And are included. The ventilation portion 27b has an air permeable grid structure 28 formed by intersecting a plurality of front ribs 26 inside thereof. Reference numeral J in the figure indicates the diameter of the ventilation portion 27b, and double-headed arrows L, M, and N indicate the front-rear direction, radial direction, and circumferential direction of the container portion 31 (see FIG. 3).

  FIG. 3 is a partial view taken along the line III-III in FIG. The absorption can 20 includes a container part 31 formed by a front part 21, a rear part 22 and a peripheral wall part 23, and an adsorbent 32 filled in the container part 31. The rear surface portion 22 has a tubular mounting portion 34 that protrudes rearward from the container portion 31 and has a thread 33 formed on the peripheral surface thereof. The outside air that has entered the front surface portion 21 and has been filtered passes through the mounting portion 34. It is possible to proceed to the face opening member 3 through. The adsorbent 32 is for adsorbing toxic components in the outside air, and is formed of an aggregate of activated carbon particles or the like formed so as to be suitable for filling the container portion 31. The adsorbent 32 includes a front surface 36 that faces the inner surface 21a of the front surface portion 21 in the container portion 31, a rear surface 37 that faces the inner surface 22a of the rear surface portion 22 in the container portion 31, and a peripheral surface 38 that is in close contact with the inner surface 23a of the peripheral wall portion. Have. The front surface 36 of the adsorbent 32 is in close contact with the inner surface 21a through a breathable nonwoven fabric 39a, and the rear surface 37 is in close contact with the inner surface 22a through a breathable nonwoven fabric 39b. However, as will be described later, the inner surface 21a and the inner surface 22a are in close contact with the adsorbent 32 only at the rib portions formed on the inner surface 21a and the inner surface 22a. ing. The nonwoven fabrics 39a and 39b prevent activated carbon particles from falling off and can be regarded as a part of the adsorbent 32. It can be said that such an adsorbent 32 is in close contact with the inner surfaces 21a and 22a of the container portion 31 in a substantial sense. The adsorbent 32 is also considered to have broken through when the adsorbing capacity reaches a predetermined threshold by adsorbing toxic components or the like, and the absorbent can 20 including such adsorbent 32 must be replaced with a new one.

FIG. 4 is a view taken along the line IV-IV in FIG. 3, and shows the inside of the rear surface portion 22 and the peripheral wall portion 23 of the container portion 31 without the illustration of the adsorbent 32. The rear surface portion 22 has a circular planar shape, and has a rear annular shielding portion 22b that partially covers the adsorbent 32 from the rear, and an opening 46 defined inside by the rear annular shielding portion 22b. A mounting portion 34 is formed in the opening 46. The opening 46 is formed at the center P in the radial direction M. The rear annular shielding portion 22b includes an outer annular portion 81 that is connected to the peripheral wall portion 23 and forms a ring so as to travel in the circumferential direction N, and an inner portion that is spaced apart from the peripheral wall portion 23 and forms the ring inside the outer annular portion 81 An annular portion 82 is included, and a step 53 (see FIG. 5) is formed between the two portions 81 and 82. The rear surface portion 22 is also formed with a plurality of first ribs 41, a plurality of second ribs 42, and a plurality of annular third ribs 43 that stand up toward the rear surface 37 of the adsorbent 32. Has been. The first rib 41 extends in the radial direction M in the outer annular portion 81, has an outer end portion 48 a connected to the inner surface 23 a of the peripheral wall portion, and an inner end portion 48 b that is the opposite end portion, and is intermittent in the circumferential direction N. Is formed. The top surface 41d of the first rib 41 is in close contact with the rear surface 37 of the adsorbent 32 through the nonwoven fabric 39b (see FIG. 3), and the adjacent first rib 41 is centered from the inner surface 23a of the peripheral wall portion 23. A first air passage portion 51 extending in the radial direction M toward P is formed. The first air passage portion 51 is connected to the rear surface 37 of the adsorbent 32 so as to be able to vent (see FIG. 5), and a tip portion extending in the radial direction M from the peripheral wall portion 23 has a dimension F in the circumferential direction N. The second rib 42 extends in the radial direction M in the inner annular portion 82 and is intermittently formed in the circumferential direction N. The illustrated second rib 42 includes a second rib 42a having a short length in the vicinity of the first rib 41, a second rib 42b having a long length, and a second rib 42c having an intermediate length. It is included. A second air passage portion 52 extending toward the center P is formed between adjacent ones of the second ribs 42. The dimension G in the circumferential direction N between the second ribs 42 is shown in FIG. As shown, dimensions G ₁ , G ₂ and G ₃ are included. The annular third rib 43 intersects with the second rib 42 b to give rigidity to the second rib 42 b and forms a plurality of small openings 47. Between the 2nd ventilation path part 52 and the 1st ventilation path part 51 and between the 2nd ventilation path part 52 and the opening 46, it exists in the state which can ventilate. In the illustrated example, the container portion 31 the inner diameter has a _{S 1,} step 53 of the rear surface portion 22 has an inner diameter _{S 2,} the opening 46 has an inner diameter _{S 3.}

FIG. 5 is a view showing the VV line cut surface in FIG. 4 together with the adsorbent 32, and the VV line is between the first ribs 41 adjacent to each other as shown in FIG. It is between the adjacent second ribs 42. 2 is on the first rib 41 and the second rib 42 aligned in the radial direction in FIG. 4, and these first and second ribs 41, 42 in FIG. The cut surface is shown in FIG. As apparent from FIGS. 3 and 5, in the rear annular shielding portion 22 b in the rear surface portion 22, the space between the outer annular portion 81 including the first air passage portion 51 and the nonwoven fabric 39 b in close contact with the rear surface 37 of the adsorbent 32. in is formed first clearance C ₁ is, between the inner annular portion 82 and the nonwoven fabric 39b including a second air passage portion 52 is formed a second clearance C ₂ is the first clearance C ₁ between the second clearance C ₂ is formed with a step 53 having a dimension D _1. Accordingly, the first clearance _{C 1} is smaller by a dimension _{D 1} than the second clearance _{C 2.} As shown in FIG. 3, the top surface 41d of the first rib 41 and the top surface 42d of the second rib 42 have the same height and support the adsorbent 32 through the nonwoven fabric 39b. The annular rib 43 has a top surface 43d that is the same as or lower than the top surface 42d (see FIG. 3) of the second rib 42. In FIG. 5, the top surface is at the same height as the top surface 42d. 43d supports the adsorbent 32 through the nonwoven fabric 39b.

In canister 20 container portion 31 is formed in this way, by the difference in dimension D ₁ between the first clearance C ₁ and the second clearance C ₂ is provided, along the inner surface 22a of the rear surface portion 22 Thus, the flow path of the outside air toward the center P in the radial direction M is narrowed by the outer annular portion 81 in the longitudinal direction L as compared with the inner annular portion 82. Therefore, outside air that enters from the front surface portion 21 of the absorbent can 20 quickly flows toward the inner annular portion 82 while contacting the adsorbent 32 in the vicinity of the center P of the absorbent can 20, while the inner surface 23 a of the peripheral wall portion 23. In the portion along, the flow velocity is suppressed and the head slowly moves toward the outer annular portion 81 while contacting the adsorbent 32. The filtered outside air that has entered the outer annular portion 81 and the inner annular portion 82 travels toward the center P in the radial direction M and proceeds to the face opening member 3 through the attachment portion 34. As described above, in the outside air passing through the adsorbent 32, the wall flow that flows along the peripheral wall inner surface 23 a has a smaller flow rate per unit time than that flowing near the center P of the absorbent can 20. Become. As a result, the breakthrough of the absorber can progress locally due to the wall flow, and the problem of the prior art that the life of the absorber can be exhausted despite the adsorption capacity at the center of the absorber can be solved. . The absorbent can 20 can also use the entire adsorbent 32 filled therein, and at the same time, use almost the entire front surface 36 and rear surface 37 of the adsorbent 32 as a ventable surface. Therefore, the life until breakthrough time is long, and the ventilation resistance during intake is low.

6 and 7 are views similar to FIGS. 4 and 5 showing an example of the embodiment of the present invention. In the container part 31 illustrated in FIGS. 6 and 7, the first air passage part 51 has a plurality of first ribs 41 and an annular fourth rib that intersects the first ribs 41 and extends in the circumferential direction N of the container part 31. 44. The first ribs 41 include long ones 41 a and short ones 41 b in the radial direction M, and these ribs 41 a and 41 b are alternately formed in the circumferential direction N. In the longitudinal direction L, the first air passage portion 51, the inner surface 22a and the first has a clearance _{C 1} between the nonwoven fabric 39b, third clearance _{C 3} between the top 44d and nonwoven 39b of the fourth rib 44 Have Second air path portion 52 includes a third second clearance _{C 2} is greater than the clearance _{C 3} between the inner surface 22a and the nonwoven fabric 39 b. The first air passage portion 51 including the fourth rib 44 is narrower in the front-rear direction L in the fourth rib 44 than the second air passage portion 52. In the container portion 31 of FIGS. 6 and 7, the fourth rib 44 and the portion outside the fourth rib 44 in the rear surface portion 22 form the outer annular portion 81 in the rear annular shielding portion 22 b, and the fourth rib 44. The inner part forms an inner annular part 82.

Also in the absorption can 20 using this container portion 31, the outside air flowing along the peripheral wall portion inner surface 23a flows from the first air passage portion 51 to the second air passage portion 52, in other words, from the outer annular portion 81 to the inner annular portion. the flow rate towards the 82 is suppressed by the third clearance C _3, rate of progress breakthrough of the adsorbent 32 in the portion along the peripheral wall inner surface 23a, rather than the rate of progress breakthrough of the adsorbent 32 in the central portion There is no particular speed. This absorbent can 20 also has a long life until breakthrough and low ventilation resistance during intake.

FIG. 8 is also a view similar to FIG. 6 showing an example of the embodiment. However, the annular fifth rib 45 formed in the container portion 31 in FIG. 8 has a slit between the adjacent first ribs 41, and the slit forms a fourth clearance C ₄ in the circumferential direction N. a first air passage portion 51 and the second air passage portion 52 are connected via a fourth clearance C _4. The fifth rib 45, the protruding portion 45a which in the vicinity of the first rib 41 respectively of the inner end portion 48b extending in the circumferential direction N, also one can be said that are formed by 45b, a fourth clearance C ₄ is an outer annular It can also be said to be a part of the clearance between the part 81 and the nonwoven fabric 39b.

9 and 10 are views showing the IX-IX line cut surface and the XX line cut surface in FIG. IX-IX line intersects the protruding portion 45a, X-X-rays passes through the fourth clearance _{C 4.} The protrusions 45 a and 45 b are preferably in contact with the nonwoven fabric 39 b (see FIG. 9), and the fourth clearance C ₄ defined by these protrusions 45 a and 45 b is the circumference of the first air passage portion 51. By narrowing the dimension in the direction locally, the flow rate of the outside air from the first ventilation path portion 51 to the second ventilation path portion 52 is reduced, and the flow rate of the wall flow generated along the peripheral wall inner surface 23a is suppressed. ing. In the container portion 31 of FIGS. 8 to 10, the annular fifth rib 45 and the portion outside the fifth rib 45 in the rear annular shielding portion 22 b in the rear surface portion 22 form an outer annular portion 81. A portion inside the rib 45 forms an inner annular portion 82.

11 and 12, FIG. 11 is a perspective view of a container portion 31 showing an example of the embodiment, and FIG. 12 is a view showing a cross section taken along line XII-XII in FIG. 11. 11 and 12 is formed of a front member 31a and a rear member 31b that are detachably connected in the front-rear direction L. The front member 31 a has a cylindrical shape, and the adsorbent 32 is filled between the front surface portion 61 and the rear surface portion 62. The front part 61 has a grid structure 63 as a whole and is breathable, and the rear part 62 also has a grid structure (not shown) similar to the grid structure 63 as a whole and is breathable. These two grid structures are in close contact with the non-woven fabrics 39a and 39b covering the adsorbent 32, and serve as a support portion that supports the adsorbent 32 from the front and rear. A first connecting portion 66 having a male screw (not shown) is formed on the peripheral surface portion 64 of the front member 31a. The rear member 31b has a tray shape and includes a peripheral wall portion 67 and a rear surface portion 68. The peripheral wall portion 67 is formed with a second connecting portion 69 having a female screw (not shown) that can be attached to and detached from the connecting portion 66. Has been. A mounting portion 34 for the face opening member 3 is formed on the rear surface portion 68. Also the rear surface portion 68, the first rib 41 and the fifth rib 45 formed on the container portion 31 in FIGS. 8 and 9, the same ribs and a clearance between the fourth clearance C ₄ etc. have been formed, FIG. 12 Of these, only a portion of the fifth rib 45 is indicated by reference numeral 45a. The rib 45a is in contact with the rear surface portion 62 of the front member 31a. In the container portion 31 of FIGS. 11 and 12, the front surface portion 61 of the front member 31a and the rear surface portion 68 of the rear member 31b are portions corresponding to the front surface portion 21 and the rear surface portion 22 in FIGS. The front part 61 is different from the front part 21 in that the front annular shielding part 27a is not formed thereon. However, a rear annular shielding portion 22b is formed on the rear surface portion 68. 11 and 12 as well as the same effect as the container portion 31 of FIGS. 8 and 9 can be obtained, and only the front member 31a is replaced when the adsorbent 32 reaches the breakthrough time. The rear member 31b can also be used continuously.

FIG. 13 is a diagram similar to FIG. 5 showing an example of the embodiment. In FIG. Container portion 31 in 13, forward annular shielding portion 27a of the front portion 21, outer annular having a fifth clearance C ₅ between the nonwoven fabric 39a have Egai a ring along the inner surface 23a of the peripheral wall portion 23 a portion 83 has an inner annular portion 84 having a sixth clearance C ₆ between the non-woven fabric 39a have Egai the ring in radially inward M than the outer annular portion 83. Since between the outer annular portion 83 and an inner annular portion 84 is formed with a step 73 having a dimension D _2, in the longitudinal direction L, and fifth clearance C ₅ is smaller than the sixth clearance C ₆ . In the container portion 31, the outside air that is about to enter from the ventilation portion 27 b flows outward in the radial direction M along the nonwoven fabric 39 a and travels toward the inner surface 23 a of the peripheral wall portion 23. Since it is narrowed, generation | occurrence | production of the wall flow along the inner surface 23a can be suppressed. The container portion 31 has the rear annular shielding portion 22b on the rear surface portion 22, and the rear annular shielding portion 22b also has the step 53, so that the action of suppressing the generation of wall flow is strengthened. However, in the case where such an action is not required, the step 53 in the rear surface portion 22 can be omitted from the container portion 31 in FIG. In face 22 after omitting the step 53, it is possible to make the first clearance C ₁ to the same value as the second clearance C _2. Further, ribs extending in the radial direction L illustrated as the first rib 41 or the second rib 42 in FIG. 4 may be formed on the inner surface of the front annular shielding portion 27a in FIG. Furthermore, the the inner surface of the forward annular shield portion 27a, instead of the step 73, or to form a the fourth rib 44 of the exemplary annular Figure 6 a third clearance C _3, the exemplary ring 8 5 ribs 45 or by forming the fourth clearance C _4, making the outer annular portion 83 to these annular rib and its outer, suppressing generation of wall flow creating an inner annular portion 84 on its inner side You can also.

  As described above, in the absorbent can 20 according to the present invention, it is possible to suppress the occurrence of wall flow in at least one of the front annular shielding portion 27a and the rear annular shielding portion 22b.

In Table 1, the can of the Example (type I) using the container part 31 illustrated in FIGS. 3-5, and the can of the Example using the container part 31 illustrated in FIGS. for preparative performance when changing the first value of the clearance C ₁ is canister of Comparative example (type III, IV, V) is shown in comparison with the performance of the. Performance evaluation items are ventilation resistance (Pa) and breakthrough time (minutes). The container portion 31 in the embodiment, the inner diameter _{S 1} is 95 mm, the longitudinal direction L of the dimensions (thickness of the adsorbent 32) is 20mm adsorbent 32, 60 mm opening diameter J of the front portion 21, the inner diameter of the mounting portion 34 Is 60 mm, the height of the first and second ribs 41 and 42 is 3 mm, the length of the first rib 41 is 7.5 mm, the length of the second rib 42 is 5 to 20 mm, and the dimension F between the first ribs 41 is F. 4 to 4.5 mm, and the dimension G between the second ribs 42 is 3 to 8 mm. The container part in the absorption can of the comparative example is as follows. Has the same dimensions as the container portion 31 of the first embodiment, a dimension of the first clearance C ₁ and the second clearance C ₂ is the same as the 3 mm (Type III), the container portion adsorbent 32 The inner surface of the portion filled with 95 mm is the rear surface portion 22 but the first rib 41 is not formed on the rear surface portion 22, and the rear surface portion 22 has an inner diameter of 80 mm (type IV). as a first rib 41 has a second rib 42 is formed a third clearance _{C 3} is 0mm to top 44d of the fourth rib 44 of annular in contact with the nonwoven fabric 39b inner diameter of the fourth rib 44 ( corresponds to the diameter _{S 2} in FIG. 4) was used as a 80 mm (type V). 70 g of activated carbon having a mesh of 10 to 20 mesh was filled in each of the container portions of Examples and Comparative Examples, and non-woven fabrics 39a and 39b having a thickness of 0.5 mm and good air permeability were used. Other conditions adopted in the performance evaluation are as follows.

Test gas (toxic gas): cyclohexane Test air flow rate: 30 L / min
Test gas concentration: 3000ppm
Maximum permeation concentration of test gas: 5ppm
Test temperature: 20 ° C
Test humidity: 50% RH

  14 and 15 are a system diagram showing a measurement process of ventilation resistance and a system diagram showing a measurement process of breakthrough time. In FIG. 15, the time from the start of the supply of air mixed with the test gas to the time when the test gas concentration in the mixed air that passed through the absorption can reach 5 ppm was measured, and this time was defined as the breakthrough time. .

  In Table 1, when the absorption can of the example is compared with the absorption can of the comparative example 1, the absorption can of the example tends to have a slight increase in ventilation resistance, but the tendency to increase the breakthrough time is remarkable. Moreover, in the absorption cans of Comparative Examples 2 and 3 in which the inner diameter of the absorption cans was substantially reduced instead of the ribs employed in the examples, the tendency for the breakthrough time to be longer is the same as in the examples, but the ventilation resistance The increase is large and favorable results cannot be obtained.

  According to the Example of Table 1, it turns out that the absorption can 20 which concerns on this invention has the effect which lengthens breakthrough time, suppressing the raise of ventilation resistance compared with the absorption can of a comparative example. .

The side view of the face body in which the absorption can is used. The perspective view of an absorption can. The figure which shows the III-III line | wire cut surface of FIG. The figure which shows the IV-IV line | wire cut surface of FIG. The figure which shows the VV line | wire cut surface of FIG. The figure similar to FIG. 3 which shows an example of embodiment. The figure which shows the VII-VII line cut surface of FIG. The figure similar to FIG. 3 which shows another example of embodiment. The figure which shows the IX-IX line | wire cut surface of FIG. The figure which shows the XX cut surface of FIG. The perspective view of the container part which shows another example of embodiment. The figure which shows the XII-XII line | wire cut surface of FIG. The figure similar to FIG. 5 which shows another example of embodiment. System diagram of ventilation resistance measurement. System diagram of breakthrough time measurement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Face body 20 Absorbing can 21 Front part 22 Rear surface part 22b Annular shielding part (rear annular shielding part)
23 peripheral wall part 23a inner surface 27a annular shielding part (front annular shielding part)
27b Ventilation portion 31 Container portion 31a Front member 31b Rear member 32 Adsorbent 36 Front surface 37 Rear surface 41 First rib 42 Second rib 44 First annular rib 45 Second annular rib 48a Outer end portion 48b Inner end portion 51 First air passage 52 2nd ventilation path 53 Level difference 62 Support part 73 Level difference 81 Outer annular part 82 Inner annular part 83 Outer annular part 84 Inner annular part C ₁ clearance (first clearance)
C ₂ clearance (second clearance)
C ₃ clearance (third clearance)
C ₄ slit (4th clearance)
L Longitudinal direction M Radial direction N Circumferential direction

Claims (3)

A cylindrical container portion is formed by a front surface portion into which outside air flows, a rear surface portion that flows out after the outside air has been filtered, and a non-breathable peripheral wall portion interposed between the front surface portion and the rear surface portion. The container part has a front-rear direction intersecting the front part and the rear part, a radial direction orthogonal to the front-rear direction, and a circumferential direction surrounding the peripheral wall part, and the container part includes In an absorption can which is filled with an adsorbent for filtering the outside air and the rear surface portion is formed to be attachable to a face body,
The adsorbent has a front surface facing the inner surface of the front surface portion and a rear surface facing the inner surface of the rear surface portion,
In the container portion, at least one of the front surface portion and the rear surface portion extends annularly in the circumferential direction in a state of being integrated with the peripheral wall portion, and any one of the front surface and the rear surface of the adsorbent. An annular shielding part that partially covers the adsorbent opposite to the cramp, and a ventilation part that is located inside the annular shielding part in the radial direction,
The annular shielding part in either the front part or the rear part has an outer annular part connected to the peripheral wall part and an inner annular part located inside the outer annular part in the radial direction, The absorbent can characterized by having a clearance between the adsorbent and the outer annular portion and the inner annular portion in any of the following a, b, and c in the front-rear direction;
a. The outer annular portion has a first clearance that is part of the clearance with the adsorbent, while the inner annular portion has a second clearance that is part of the clearance with the adsorbent; A mode in which a step is formed between the outer annular portion and the inner annular portion so that the first clearance is smaller than the second clearance in the front-rear direction,
b. A first annular rib is formed between the outer annular portion and the inner annular portion so as to rise from the inner surface of the annular shielding portion toward the adsorbent and extend in the circumferential direction. A third clearance that is a part of the clearance that allows ventilation in the radial direction is formed between the adsorbent and the adsorbent;
c. Between the outer annular portion and the inner annular portion, a second annular rib is formed extending from the inner surface of the annular shielding portion toward the adsorbent and extending in the circumferential direction. A mode in which a slit that allows ventilation in the radial direction between the outer annular portion and the inner annular portion is intermittently formed in the circumferential direction as a part of the clearance.   The container portion is formed by a front member including the front portion and the adsorbent, and a rear member including the rear portion and removably attached to the front member, and the adsorbent is disposed on the front member. The absorbent can according to claim 1, wherein a support portion is formed to support the adsorbent so as to allow ventilation from behind the front member.   The absorption can according to claim 2, wherein the annular shielding portion formed on the rear surface portion of the rear member faces the rear surface of the adsorbent via the support portion.

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