JPH04197439A - Molded adsorbent and its manufacture - Google Patents
Molded adsorbent and its manufactureInfo
- Publication number
- JPH04197439A JPH04197439A JP33197290A JP33197290A JPH04197439A JP H04197439 A JPH04197439 A JP H04197439A JP 33197290 A JP33197290 A JP 33197290A JP 33197290 A JP33197290 A JP 33197290A JP H04197439 A JPH04197439 A JP H04197439A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- activated carbon
- heat
- parts
- adsorbent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003463 adsorbent Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000057 synthetic resin Substances 0.000 claims abstract description 35
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 40
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 11
- 230000035699 permeability Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 2
- 239000011347 resin Substances 0.000 abstract description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 abstract 1
- 239000005033 polyvinylidene chloride Substances 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011301 petroleum pitch Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、成形吸着材およびその製造方法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a shaped adsorbent and a method for manufacturing the same.
なお、本明細書において、“部”および“％”とあるの
は、それぞれ“重量部″および“重量％”を意味する。In this specification, "parts" and "%" mean "parts by weight" and "% by weight," respectively.
従来技術とその問題点
本発明者らは、先に成形吸着材として活性炭繊維と熱溶
融性合成樹脂とを均一なスラリーとし、脱水成形後加熱
することにより、活性炭繊維を熱溶融性合成樹脂により
ランダムに接合保持した抄紙構造の成形吸着材を得た（
特開昭６３−２８３７４９号公報参照二以下これを先願
吸着材ということがある）。この先願吸着材は、フェル
ト状乃至ペーパー状の吸着材に比較すれば、通気性、通
水性、品質安定性、強度などの点で著しく優れている。Prior Art and its Problems The present inventors first made a uniform slurry of activated carbon fibers and heat-melting synthetic resin as a shaped adsorbent, and by heating after dehydration molding, the activated carbon fibers were made into a heat-melting synthetic resin. A molded adsorbent with a papermaking structure that was randomly bonded and held was obtained (
(See Japanese Unexamined Patent Publication No. 63-283749 (hereinafter this may be referred to as the "first application adsorbent"). This prior application adsorbent is significantly superior in terms of air permeability, water permeability, quality stability, strength, etc. when compared to felt-like or paper-like adsorbents.
しかしながら、この様な成形吸着材においては、熱溶融
性合成樹脂の接着強度が低いため、樹脂の配合量を増大
させる必要がある。その結果、成形吸着材の比表面積が
減少したり、成形品中の活性炭素繊維の含有率が低下す
るという欠点があった。However, in such a shaped adsorbent, since the adhesive strength of the hot-melt synthetic resin is low, it is necessary to increase the amount of resin blended. As a result, there were drawbacks such as a decrease in the specific surface area of the shaped adsorbent and a decrease in the content of activated carbon fiber in the molded article.
問題点を解決するための手段
本発明者は、先願吸着材の性能をより一層向上させるべ
く、さらに種々研究を重ねた結果、吸着材を製造するに
際し使用する活性炭繊維と熱溶融性合成樹脂とを含む均
一なスラリーにおいて、融点１００℃未満の熱溶融性合
成樹脂を使用する場合には、熱溶融性合成樹脂の配合量
を減少させても、強度および吸着能のいずれにも優れた
成形吸着材が得られることを見出した。Means for Solving the Problems In order to further improve the performance of the adsorbent of the prior application, the inventor of the present invention has conducted various researches, and as a result, has developed activated carbon fibers and heat-melting synthetic resin used in manufacturing the adsorbent. When using a hot-melt synthetic resin with a melting point of less than 100°C in a homogeneous slurry containing It has been found that an adsorbent can be obtained.
即ち、本発明は、下記の成形吸着材およびその製造方法
を提供するものである：
■活性炭繊維１００部および軟化点１００℃未満の熱溶
融性合成樹脂１部以上５部未満からなり、活性炭繊維が
熱溶融性合成樹脂によりランダムに接合保持されている
ことを特徴とする抄紙構造の成形吸着材。That is, the present invention provides the following shaped adsorbent and method for producing the same: (1) consisting of 100 parts of activated carbon fibers and 1 part or more and less than 5 parts of a heat-melting synthetic resin with a softening point of less than 100°C; A molded adsorbent material with a paper-making structure characterized by being randomly bonded and held together by a heat-melting synthetic resin.
■活性炭繊維１００部および軟化点１００℃未満の熱溶
融性合成樹脂１部以上５部未満を含む均一“なスラリー
を脱水成形した後、加熱して活性炭繊維を熱溶融性合成
樹脂によりランダムに接合保持させることを特徴とする
抄紙構造の成形吸着材の製造方法。 本発明において、
抄紙構造の成形吸着材とは、吸着材を構成する活性炭素
繊維が厚手の和紙の様にランダム且つ緻密に配置された
構造を有する材料を意味する。そして、この様な構造体
においては、活性炭素繊維は、熱溶融性合成樹脂により
接合保持されている。■ After dehydrating and molding a homogeneous slurry containing 100 parts of activated carbon fibers and 1 part or more and less than 5 parts of a heat-melt synthetic resin with a softening point of less than 100°C, the activated carbon fibers are randomly joined with the heat-melt synthetic resin by heating. A method for producing a molded adsorbent having a papermaking structure characterized by retaining the adsorbent.In the present invention,
A shaped adsorbent having a paper-making structure means a material having a structure in which activated carbon fibers constituting the adsorbent are randomly and densely arranged like thick Japanese paper. In such a structure, the activated carbon fibers are bonded and held together by a heat-melting synthetic resin.
本発明において使用す・る活性炭素繊維としては、特に
限定されず、吸着材の使用分野などに応じて適宜選択す
れば良い。活性炭素繊維としては、通常繊維径２〜３０
μｍ程度、繊維長さ０．５〜１０ｍｍ程度、微細孔径８
〜２０人程度、比表面積５００〜２５００ｒｒｒ／ｇ程
度のものを使用する。The activated carbon fiber used in the present invention is not particularly limited, and may be appropriately selected depending on the field of use of the adsorbent. Activated carbon fibers usually have a fiber diameter of 2 to 30
Approximately μm, fiber length approximately 0.5 to 10 mm, micropore diameter 8
About 20 people use one with a specific surface area of about 500 to 2,500 rrr/g.
また、活性炭素繊維の原料も特に限定されず、レーヨン
系、ＰＡＮ系、フェノール樹脂系、石炭ピッチ系、石油
ピッチ系などのいずれであっても良い。Furthermore, the raw material for the activated carbon fiber is not particularly limited, and may be any one of rayon-based, PAN-based, phenol resin-based, coal pitch-based, petroleum pitch-based, and the like.
活性炭素繊維を接合一体化させる熱溶融性合成樹脂とし
ては、軟化点が１００℃未満、より好ましくは５０〜８
０℃程度のものを使用する。軟化点が１００℃以上の熱
溶融性合成樹脂を使用する場合には、湿潤成形体の乾燥
時に熱溶融性合成樹脂が溶融する以前に水分が蒸発して
しまうので、多量の熱溶融性合成樹脂を使用しなければ
、成形吸着材を製造することができなくなる。この様な
熱溶融性合成樹脂としては、塩化ビニリデン、ポリビニ
ルアルコールなどが例示され、特にポリビニルアルコー
ルがより好ましい。熱溶融性合成樹脂としては、糸状の
ものを使用すると、活性炭繊維の細孔を塞ぐことが少な
いので、より好ましい。The heat-melting synthetic resin for bonding and integrating the activated carbon fibers has a softening point of less than 100°C, more preferably 50 to 8°C.
Use one with a temperature of about 0°C. When using a thermofusible synthetic resin with a softening point of 100°C or higher, water evaporates before the thermofusible synthetic resin melts when the wet molded product dries, so a large amount of the thermofusible synthetic resin is used. If this is not used, it will not be possible to produce shaped adsorbents. Examples of such heat-melting synthetic resins include vinylidene chloride and polyvinyl alcohol, with polyvinyl alcohol being particularly preferred. As the heat-melting synthetic resin, it is more preferable to use a filamentous one because it less likely blocks the pores of the activated carbon fibers.
熱溶融性合成樹脂糸としては、成形吸着材製造時の加熱
温度では溶融若しくは変質しない高軟化点の繊維糸の表
面に成形吸着材製造時の加熱温度で軟化する合成樹脂を
被覆したものを使用しても良い。The heat-melting synthetic resin thread is made of fiber yarn with a high softening point that does not melt or change in quality at the heating temperature used to produce the molded adsorbent, and whose surface is coated with a synthetic resin that softens at the heating temperature used to produce the molded adsorbent. You may do so.
活性炭素繊維１００部に対する熱溶融性合成樹脂の配合
量は、１部以上５部未満程度（より好ましくは１．４〜
４．５部程度、さらに好ましくは２〜３部程度）とする
。熱溶融性合成樹脂の配合量が少なすぎる場合には、成
形吸着材の強度が低くなり、一方配合量が多すぎる場合
には、活性炭繊維の細孔が塞がれて、気孔率が低下する
。The blending amount of the heat-melting synthetic resin with respect to 100 parts of activated carbon fiber is about 1 part or more and less than 5 parts (more preferably 1.4 to 5 parts).
(about 4.5 parts, more preferably about 2 to 3 parts). If the amount of heat-melting synthetic resin is too small, the strength of the molded adsorbent will be low, while if it is too large, the pores of the activated carbon fibers will be blocked and the porosity will decrease. .
本発明による抄紙構造の成形吸着材は、以下の様にして
製造される。まず、所定の割合で活性炭素繊維および熱
溶融性合成樹脂を含有する均一な水性スラリーを調製す
る。水性スラリー中の固形分濃度は、特に限定されるも
のではないが、取扱いの容易さ、成形の容易さなどの観
点から、０．１〜２部程度とすることが好ましい。スラ
リーの調製に際しては、機械的な撹拌を行なっても良く
、また、成形吸着材の性能を阻害しない限り、分散剤、
安定剤、粘度調整剤、歩留向上剤などの公知の製紙用添
加剤を配合しても良い。かくして得られた均一な水性ス
ラリーを成形する。成形は、例えば、吸引成形の様に、
減圧下に予備脱水しつつ行なうことが好ましい。次いで
、使用する熱溶融性合成樹脂に応じた温度で成形体を加
熱し、合成樹脂の溶融による成形体の一体化および乾燥
を行なって、本発明の成形吸着材を得る。The shaped adsorbent having a papermaking structure according to the present invention is manufactured as follows. First, a uniform aqueous slurry containing activated carbon fibers and a heat-melting synthetic resin in a predetermined ratio is prepared. The solid content concentration in the aqueous slurry is not particularly limited, but from the viewpoint of ease of handling, ease of molding, etc., it is preferably about 0.1 to 2 parts. When preparing the slurry, mechanical stirring may be used, and dispersants and
Known papermaking additives such as stabilizers, viscosity modifiers, and retention aids may also be blended. The homogeneous aqueous slurry thus obtained is shaped. Molding, for example, suction molding,
It is preferable to carry out preliminary dehydration under reduced pressure. Next, the molded body is heated at a temperature depending on the heat-melting synthetic resin used, and the molded body is integrated by melting the synthetic resin and dried to obtain the molded adsorbent of the present invention.
なお、成形体の強度をより一層改善するためには、非熱
溶融性繊維を補強材として使用することができる。In addition, in order to further improve the strength of the molded body, non-thermofusible fibers can be used as a reinforcing material.
本発明による成形吸着材は、液相および気相における固
形分の濾過、微量不純物および有害成分の吸着除去、有
用成分の吸脱着による濃縮などに有用である。The shaped adsorbent according to the present invention is useful for filtration of solids in liquid and gas phases, adsorption removal of trace impurities and harmful components, concentration of useful components by adsorption and desorption, and the like.
より具体的には、本発明による成形吸着材は、浄水器に
おけるフィルターとして、水道水からの鉄錆、悪臭物質
、遊離塩素などの除去；空気清浄器およびニアコンディ
ショナーにおけるフィルターとして、煙、悪臭物質の除
去および調質；化学工場、クリーニング工場などにおけ
るフロン類などの溶剤回収；鉱物油および植物油中の固
形分の除去などの広範な分野で使用される。More specifically, the shaped adsorbent according to the present invention can be used as a filter in water purifiers to remove iron rust, malodorous substances, free chlorine, etc. from tap water; as a filter in air purifiers and near conditioners to remove smoke, malodorous substances, etc. It is used in a wide range of fields, including the removal and refining of fluorocarbons; the recovery of fluorocarbons and other solvents in chemical plants and cleaning plants; and the removal of solids in mineral oils and vegetable oils.
発明の効果 本発明によれば、下記の様な顕著な効果が達成される。Effect of the invention According to the present invention, the following remarkable effects are achieved.
（１）得られる成形吸着材は、活性炭素繊維および熱溶
融性合成樹脂を均一に分散させた特定濾水度の水性スラ
リーから製造されるので、これらの各成分が均一に分散
した構造となっている。従って、本発明による成形吸着
材は、通気性および通水性に優れ、品質が安定している
。(1) The resulting shaped adsorbent is manufactured from an aqueous slurry with a specific freeness in which activated carbon fibers and heat-melting synthetic resin are uniformly dispersed, so it has a structure in which each of these components is uniformly dispersed. ing. Therefore, the shaped adsorbent according to the present invention has excellent air permeability and water permeability, and is stable in quality.
（２）先願吸着材に比して、熱溶融性合成繊維の配合量
が減少しているにも拘らず、その強度は、同等もしくは
それ以上である。(2) Compared to the adsorbent of the prior application, although the blended amount of heat-fusible synthetic fiber is reduced, its strength is the same or higher.
（３）また、先願吸着材に比して、熱溶融性合成樹脂の
含有量が減少しているので、通気性および通水性も改善
されている。(3) Furthermore, since the content of heat-melting synthetic resin is reduced compared to the adsorbent of the prior application, air permeability and water permeability are also improved.
（４）適量の非熱溶融性繊維を補強材として配合する場
合には、成形吸着材の強度がより一層改善される。(4) When a suitable amount of non-thermofusible fiber is blended as a reinforcing material, the strength of the shaped adsorbent is further improved.
実施例
以下に実施例および比較例を示し、本発明の特徴とする
ところをより一層明確にする。EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention.
なお、各実施例で得られた成形吸着材の吸着性能は、成
形しない活性炭素繊維のそれとほぼ同様であった。The adsorption performance of the shaped adsorbent obtained in each example was almost the same as that of the unmolded activated carbon fiber.
実施例１
活性炭素繊維９８部を水５０００部に分散させ、活性炭
素繊維の繊維長が０．１〜５ｍｍとなるまで叩解した後
、軟化点６０℃のポリビニルアルコールの０．５％水溶
液２部を加えて、均一なスラリーを得た。Example 1 98 parts of activated carbon fibers were dispersed in 5000 parts of water and beaten until the fiber length of the activated carbon fibers was 0.1 to 5 mm, and then 2 parts of a 0.5% aqueous solution of polyvinyl alcohol with a softening point of 60°C was added. was added to obtain a uniform slurry.
次いで、底面に多数の吸引用小孔を設けた円柱形の成形
用型（内径２９１ＩＩ１１長さ５０關）の底部から吸引
を行ないつつ、該成形用型の内部に上記の水性スラリー
を付着させた後、形成された湿潤状態の中空円筒体（外
径２９ｍｍ、高さ５０關）を上記型から取り外し、１２
０℃で１２０分間加熱乾燥した。Next, while suction was applied from the bottom of a cylindrical mold (inner diameter: 291 mm, 11 mm, length: 50 mm), the aqueous slurry was adhered to the inside of the mold. After that, the formed hollow cylindrical body (outer diameter 29 mm, height 50 mm) in a wet state was removed from the mold, and 12
It was dried by heating at 0° C. for 120 minutes.
かくして得られた抄紙構造の成形吸着材の寸法は、外径
２９ＩＩＩＩ＋、高さ５０ｍｍであり、その密度は、０
．１０ｇ／ｃｍ３であった。The dimensions of the thus obtained molded adsorbent having a papermaking structure are an outer diameter of 29III+ and a height of 50 mm, and its density is 0.
．． It was 10g/cm3.
比較例１
ポリビニルアルコールに代えてポリエステル繊維（軟化
点１４０℃）を使用する以外は実施例１の手法に準じて
水性スラリーを調製した後、実施例１と同様にして成形
および加熱乾燥を行なったところ、成形体の強度が不十
分で、わずかな力を加えただけで簡単に崩壊した。Comparative Example 1 An aqueous slurry was prepared according to the method of Example 1 except that polyester fibers (softening point 140°C) were used instead of polyvinyl alcohol, and then molded and heat-dried in the same manner as in Example 1. However, the strength of the molded body was insufficient, and it easily collapsed when only a slight force was applied.
（以 上）(that's all)
Claims (2)
熱溶融性合成樹脂１部以上５部未満からなり、活性炭繊
維が熱溶融性合成樹脂によりランダムに接合保持されて
いることを特徴とする抄紙構造の成形吸着材。(1) A paper made of 100 parts of activated carbon fibers and 1 part or more and less than 5 parts of a heat-melt synthetic resin with a softening point of less than 100°C, wherein the activated carbon fibers are randomly bonded and held by the heat-melt synthetic resin. Molded adsorbent structure.
熱溶融性合成樹脂１部以上５部未満を含む均一なスラリ
ーを脱水成形した後、加熱して活性炭繊維を熱溶融性合
成樹脂によりランダムに接合保持させることを特徴とす
る抄紙構造の成形吸着材の製造方法。(2) After dehydrating and molding a homogeneous slurry containing 100 parts of activated carbon fibers and 1 part or more and less than 5 parts of a heat-melt synthetic resin with a softening point of less than 100°C, it is heated to randomly form the activated carbon fibers with the heat-melt synthetic resin. A method for manufacturing a molded adsorbent having a papermaking structure characterized by bonding and holding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33197290A JPH04197439A (en) | 1990-11-28 | 1990-11-28 | Molded adsorbent and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33197290A JPH04197439A (en) | 1990-11-28 | 1990-11-28 | Molded adsorbent and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04197439A true JPH04197439A (en) | 1992-07-17 |
Family
ID=18249708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33197290A Pending JPH04197439A (en) | 1990-11-28 | 1990-11-28 | Molded adsorbent and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04197439A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08206497A (en) * | 1994-12-01 | 1996-08-13 | Carl Freudenberg:Fa | Adsorption-air filter and its production |
-
1990
- 1990-11-28 JP JP33197290A patent/JPH04197439A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08206497A (en) * | 1994-12-01 | 1996-08-13 | Carl Freudenberg:Fa | Adsorption-air filter and its production |
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