JPH031043B2 - - Google Patents
Info
- Publication number
- JPH031043B2 JPH031043B2 JP22878586A JP22878586A JPH031043B2 JP H031043 B2 JPH031043 B2 JP H031043B2 JP 22878586 A JP22878586 A JP 22878586A JP 22878586 A JP22878586 A JP 22878586A JP H031043 B2 JPH031043 B2 JP H031043B2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- filter
- porous base
- fluororesin
- holes
- 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 26
- 239000005871 repellent Substances 0.000 claims description 22
- 230000002940 repellent Effects 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000004604 Blowing Agent Substances 0.000 claims 2
- 239000002585 base Substances 0.000 description 22
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 239000000126 substance Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 229920002050 silicone resin Polymers 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000009629 microbiological culture Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Filtering Materials (AREA)
Description
［発明の目的］
（産業上の利用分野）
本発明は、気相、液相の界する２相状態で使用
されるフイルターに関するものである。本発明
は、ガスフイルター、耐熱、耐薬品性を生かしプ
ラント等の濾過フイルターなどに利用できる。
（従来の技術）
従来、かかるフイルターの製造において、製品
の品質を左右する撥水処理技術として、一般にシ
リコーン樹脂系撥水剤で処理する方法、フツ素樹
脂粉末を熱融着する方法、フツ素樹脂分散剤で処
理する方法等が知られている。また、例えば、特
開昭43−8510号明細書において、フツ素樹脂を含
む多孔性薄層（成膜）をフイルター端面に付与す
る技術が開示されている。
（発明が解決しようとする問題点）
従来技術のうち、シリコーン樹脂系撥水剤で処
理する方法は、シリコーン樹脂系撥水剤の劣化に
より、撥水性を失いやすく、耐久性に乏しいとい
う問題がある。またフツ素樹脂粉末を熱融着する
方法は多孔度が低く多孔質の細孔分布制御が困難
であるという難点がある。フツ素樹脂分散剤で処
理する方法は、多孔体の気孔にフツ素樹脂が入り
こむため多孔性を減じる結果になり、またこの方
法では多孔体内部まで均一な組織が形成されるよ
う処理することが非常に困難であるという欠点が
ある。更に、特開昭43−8510号明細書に開示され
た技術の場合には、組織の均一性がないことがト
リガーとなつて膜が剥離し易く、成膜層が外乱に
より破壊されれば撥水性が全くなくなつてしまう
という問題が生ずる。
本発明は、上記問題点のない耐寒、耐熱、耐薬
品性（耐酸性、耐アルカリ性など）、耐久性等に
優れ、均一な組織をもつたフイルターを提供する
ことを目的とするものである。
［発明の構成］
（問題点を解決するための手段）
本発明のフイルターは、セラミツク製の多数の
貫通孔を有する多孔基材と、
該多孔基材の該貫通孔を形成する多孔基材内表
面を覆う被覆部と該貫通孔を形成する少なくとも
一部の通路を貫通する多数の微細孔をもつ微小孔
質部とからなるフツ素樹脂製の撥水体とからなる
ことを特徴とするものである。
即ち、本発明のフイルターはセラミツク製の多
孔基材、多孔基材内表面を覆う被覆部、多数の貫
通する微細孔をもつ微小孔質部を基本構成とす
る。
本発明に於いて撥水処理は、フツ素樹脂とフツ
素樹脂の焼付温度以下で熱分解し気相となる有機
物を含む分散液を前記多孔基材に含浸させ、含浸
処理を施した後、加熱し焼付を行い被覆部を微小
孔質部をもつフツ素樹脂製の撥水体とすることを
特色とするものである。
（作用）
本発明によるフイルターでは、多孔基材中に形
成された多数の貫通孔にフツ素樹脂（特にポリ４
フツ化エチレン、PTFE）が網目状に三次元的に
はりめぐらされ、多数の貫通した微細孔を形成し
ているので、多孔の減少がなく、良好な通気性撥
水性が保たれる。またセラミツクを主原料として
得られた上記多孔基材にフツ素樹脂等の分散液を
含浸させる含浸処理を超音波槽又は真空中にて行
うとともに分散液のフツ素樹脂の濃度を所定範囲
に維持することにより組織の均一性が得られ、フ
イルター内部まで均一な撥水効果が保たれる。
（実施例）
本実施例によるフイルターは、セラミツク製の
多数の貫通孔を有する多孔基材と多孔基材内表面
を覆う被覆部と、前記貫通孔を形成する少なくと
も一部の通路を貫通する多数の微細孔をもつ微小
孔質部を基本構成とする。以下、フイルターの製
造工程における撥水処理を中心に説明する。
ポリ４フツ化エチレン（PTFE）分散液中に、
PTFE硬化、焼付温度（450℃）以下で熱分解し、
気相となる有機物溶液又は常温液状の物質を混合
し、この混合液を、セラミツクス粉末の基材粒子
にガラスフリツト組成物を添加し成形し、焼結し
た多孔基材に含浸させ、その後、熱処理により多
孔基材中に貫通孔をつぶすことなくPTFEを多孔
基材構成粒子表面に焼付け撥水処理を行つた。
PTFE分散液中のPTFE濃度を30％以上70％以
下とした。20％以下であれば分散が疎であり又80
％以上であれば分散が密となりPTFEの凝集が生
ずる。いずれにしても30％〜70％の範囲外では均
一な組織を生成するのが困難である。
又熱分解する有機物としては、アクリル系、ワ
ツクス系、パラフイン系、アミン類、フタレート
係、エステル系等種々可能であり、PTFE硬化・
焼付温度（450℃）以下で熱分解が終了する物質
であればよい。PTFE硬化・焼付は、室温より
徐々に昇温しても、所定温度の炉中に投入しても
よい。第１図は上記方法で撥水処理を行つたフイ
ルターの構造の一部拡大図であり、多孔基材１
と、その結合剤２とPTFE３からなつている。第
１図において多孔基材１上には、PTFE３が薄く
均一に覆つて被覆部Ａを構成し、多孔基材１中の
貫通孔４は多数の微細孔５に区分され微小孔質部
Ｂを形成し、基材粒子間にてPTFEが網目状に三
次元的に発達しているのが認められた。第２図は
撥水処理をしない場合のフイルターの構造の一部
拡大図で基材６、結合剤７、気孔８からなつてい
る。
（試験）
＃40のアルミナビーズ、ムライトビーズ、ガラ
スビーズにガラス粉末を重量比で15.0％添加し混
合し、プレス成形後各々1400℃、1250℃、1050℃
にて焼成した多孔基材を、シリコーン樹脂系、
ポリ３フツ化塩化エチレン分散液、PTFE分
散液で200℃〜450℃焼付させ撥水処理したフイル
ターを比較例として作成した。
一方、上記方法で焼成した多孔基材を本発明に
従い、PTFE分散液＋有機物の混合液で比較例
と同様200℃〜450℃で焼付せさせ撥水処理してフ
イルターを作製した。こうして作製したフイルタ
ーを、20mmAqでの通気量：撥水耐圧（mmAq）：
耐酸試験後の20mmAqでの通気量：耐酸試験後の
撥水耐圧（mmAq）の各項目についてテストした。
テスト項目中、撥水耐圧（mmAq）は第３図に
示すようにフイルター９上にガラス管１０を立
て、蒸溜水をガラス管中に入れ、フイルター下部
より蒸溜水が析出する瞬間の水圧を意味する。な
お１１はシール材である。
又、耐酸試験は80℃の温度で37％のH2SO4に
720時間フイルターを浸漬し、乾燥後測定した。
以上のテスト結果を第１表に示す。
[Object of the Invention] (Industrial Application Field) The present invention relates to a filter used in a two-phase state where a gas phase and a liquid phase interface. The present invention can be used for gas filters, filtration filters for plants, etc. by taking advantage of their heat resistance and chemical resistance. (Prior art) Conventionally, in the manufacture of such filters, the water repellent treatment techniques that affect the quality of the product are generally a method of treatment with a silicone resin water repellent, a method of heat-sealing fluororesin powder, and a method of heat-sealing fluororesin powder. A method of treating with a resin dispersant is known. Furthermore, for example, Japanese Patent Application Laid-open No. 43-8510 discloses a technique of applying a porous thin layer (film formation) containing a fluororesin to the end face of a filter. (Problems to be Solved by the Invention) Among the conventional techniques, the method of treating with a silicone resin water repellent has the problem that it easily loses water repellency due to deterioration of the silicone resin water repellent and is poor in durability. be. Furthermore, the method of heat-sealing fluororesin powder has a drawback in that the porosity is low and it is difficult to control the pore distribution. The method of treating with a fluororesin dispersant reduces porosity because the fluororesin enters the pores of the porous body, and this method also makes it impossible to treat the porous body so that a uniform structure is formed inside it. The disadvantage is that it is very difficult. Furthermore, in the case of the technique disclosed in JP-A No. 43-8510, the film tends to peel off due to the lack of uniformity of the structure, and if the film layer is destroyed by external disturbances, the film becomes repellent. A problem arises in that there is no aqueous content at all. The object of the present invention is to provide a filter that does not have the above-mentioned problems and has excellent cold resistance, heat resistance, chemical resistance (acid resistance, alkali resistance, etc.), durability, etc., and has a uniform structure. [Structure of the Invention] (Means for Solving the Problems) The filter of the present invention includes a porous base material made of ceramic having a large number of through holes, and a porous base material in which the through holes are formed. A water repellent body made of fluororesin, comprising a coating part that covers the surface and a microporous part having a large number of micropores passing through at least some of the passages forming the through holes. be. That is, the filter of the present invention has a basic structure including a porous base material made of ceramic, a covering portion covering the inner surface of the porous base material, and a microporous portion having a large number of penetrating micropores. In the present invention, the water repellent treatment is performed by impregnating the porous base material with a dispersion containing an organic substance that thermally decomposes and becomes a gas phase at a temperature below the baking temperature of the fluororesin, and then performing an impregnation treatment. It is characterized by heating and baking to make the covering part a water-repellent body made of fluororesin having microporous parts. (Function) In the filter according to the present invention, a large number of through holes formed in a porous base material are filled with a fluorocarbon resin (especially polyurethane resin)
Fluorinated ethylene (PTFE) is three-dimensionally arranged in a mesh pattern, forming a large number of penetrating micropores, so there is no reduction in porosity and good air permeability and water repellency are maintained. In addition, an impregnation treatment is performed in which the porous base material obtained using ceramic as the main raw material is impregnated with a dispersion of fluororesin in an ultrasonic bath or in a vacuum, and the concentration of fluororesin in the dispersion is maintained within a predetermined range. By doing so, a uniform structure can be obtained, and a uniform water repellent effect can be maintained even inside the filter. (Example) A filter according to this example includes a porous base material having a large number of through holes made of ceramic, a coating portion that covers the inner surface of the porous base material, and a large number of holes that pass through at least some of the passages forming the through holes. The basic structure is a microporous part with micropores. The following will mainly explain the water repellent treatment in the filter manufacturing process. In polytetrafluoroethylene (PTFE) dispersion,
PTFE hardens and thermally decomposes below the baking temperature (450℃),
An organic solution that becomes a gas phase or a substance that is liquid at room temperature is mixed, and this mixture is added to ceramic powder base material particles with a glass frit composition, molded, impregnated into a sintered porous base material, and then heat-treated. Water repellent treatment was performed by baking PTFE onto the surface of the particles constituting the porous base material without destroying the through holes in the porous base material. The PTFE concentration in the PTFE dispersion was set to 30% or more and 70% or less. If it is less than 20%, the variance is sparse and 80
% or more, the dispersion becomes dense and PTFE agglomerates. In any case, it is difficult to generate a uniform structure outside the range of 30% to 70%. Various types of organic substances that can be thermally decomposed include acrylic, wax, paraffin, amine, phthalate, and ester.
Any substance that completes thermal decomposition at a temperature below the baking temperature (450°C) may be used. The PTFE may be hardened and baked by gradually increasing the temperature from room temperature or by placing it in a furnace at a predetermined temperature. Figure 1 is a partially enlarged view of the structure of a filter treated with water repellency using the above method.
It consists of the binder 2 and PTFE3. In FIG. 1, a porous base material 1 is thinly and uniformly covered with PTFE 3 to form a coating part A, and a through hole 4 in the porous base material 1 is divided into a large number of micropores 5 to form a microporous part B. It was observed that PTFE was formed in a three-dimensional network between the base material particles. FIG. 2 is a partially enlarged view of the structure of the filter without water repellent treatment, which is composed of a base material 6, a binder 7, and pores 8. (Test) Glass powder was added to #40 alumina beads, mullite beads, and glass beads at a weight ratio of 15.0%, and the mixture was press-molded at 1400℃, 1250℃, and 1050℃, respectively.
The porous base material fired in
As a comparative example, a filter was prepared by baking a polytrifluorochloroethylene dispersion liquid or a PTFE dispersion liquid at 200°C to 450°C to make it water repellent. On the other hand, according to the present invention, the porous base material fired by the above method was baked at 200°C to 450°C with a mixture of PTFE dispersion and organic matter at 200°C to 450°C to make it water repellent, thereby producing a filter. Air flow rate at 20mmAq: Water repellency pressure (mmAq):
Air flow rate at 20 mmAq after acid resistance test: Each item of water repellency pressure (mmAq) after acid resistance test was tested. Among the test items, water repellency pressure (mmAq) means the water pressure at the moment when the glass tube 10 is placed on the filter 9 and distilled water is poured into the glass tube as shown in Figure 3, and the distilled water precipitates from the bottom of the filter. do. Note that 11 is a sealing material. Also, the acid resistance test is 37% H2SO4 at a temperature of 80℃ .
The filter was soaked for 720 hours and measured after drying. The above test results are shown in Table 1.
【表】
（評価）
第１表に示されるように本発明による撥水処理
を行つたフイルターは耐酸試験後の通気量、撥水
耐圧ともに劣化なく、本発明が従来技術よりも優
れたものであることが証明された。
［発明の効果］
本発明のフイルターは、フイルターを構成する
多孔基材粒子をフツ素樹脂（PTF）が覆つて被
覆部を構成しているので、−100℃〜300℃の耐寒、
耐熱性があり、このように使用可能な温度範囲が
広いので単にガスフイルターとしてだけでなく例
えば寒冷地での液体濾過フイルターや工場プラン
ト等のフイルター微生物培養担体としても優れた
特性をもつ。
また、フイルターの性質上耐アルカリ、耐酸性
に優れ、薬品に対する耐久性は従来のシリコーン
樹脂、ポリ３フツ化塩化エチレン等を唆ぐもので
ある。
フイルター強度はPTFEの結合でなく、ガラス
フリツトによる結合が支配的であるため、フツ素
樹脂粒子の熱融着に比べ高強度、高剛性を有す
る。更に多孔基材の貫通孔を形成する少なくとも
一部の通路を貫通する多数の微細孔をもつ微小孔
質部が上記被覆部とともに、撥水処理を経て形成
されるため充分な通気性が確保できる。[Table] (Evaluation) As shown in Table 1, the filter treated with the water repellent treatment according to the present invention showed no deterioration in air flow rate or water repellent pressure after the acid resistance test, indicating that the present invention is superior to the conventional technology. It has been proven that there is. [Effects of the Invention] The filter of the present invention has a covering portion formed by covering the porous base material particles constituting the filter with fluororesin (PTF), so that it has cold resistance from -100°C to 300°C.
Because it is heat resistant and can be used over a wide temperature range, it has excellent properties not only as a gas filter, but also as a liquid filtration filter in cold regions, a filter microbial culture carrier for industrial plants, etc. Furthermore, due to the nature of the filter, it has excellent alkali resistance and acid resistance, and its durability against chemicals is comparable to conventional silicone resins, polytrifluorochloroethylene, and the like. Since the filter strength is dominated by bonding by glass frit rather than PTFE bonding, it has higher strength and rigidity compared to thermal fusion of fluororesin particles. Furthermore, a microporous part having a large number of micropores passing through at least some of the passages forming the through-holes of the porous base material is formed together with the covering part through a water repellent treatment, so that sufficient air permeability can be ensured. .
第１図は本発明による撥水処理を施したフイル
ター構造の一部拡大図であり、第２図は撥水処理
を行わない場合のフイルター構造の一部拡大図で
ある。第３図は撥水耐圧試験に使用した装置の説
明図である。
１……多孔基材粒子、２……結合剤、３……フ
ツ素樹脂、Ａ……被覆部、Ｂ……微小孔質部、４
……貫通孔、５……微細孔。
FIG. 1 is a partially enlarged view of a filter structure subjected to water repellent treatment according to the present invention, and FIG. 2 is a partially enlarged view of a filter structure without water repellent treatment. FIG. 3 is an explanatory diagram of the apparatus used for the water repellent pressure test. DESCRIPTION OF SYMBOLS 1... Porous base material particle, 2... Binder, 3... Fluororesin, A... Covering part, B... Microporous part, 4
...Through hole, 5...Minute hole.
Claims (1)
材と、 該多孔基材の該貫通孔を形成する多孔基材内表
面を覆う被覆部と該貫通孔を形成する少なくとも
一部の通路を貫通する多数の微細孔をもつ微小孔
質部とからなるフツ素樹脂製の撥水体とからなる
ことを特徴とするフイルター。 ２ 撥水体は、多孔基材の該貫通孔に導入された
フツ素樹脂と該フツ素樹脂の焼付温度以下で分解
し気相となる有機性発泡剤とを含む分散液を加熱
し焼付けるとともに該有機性発泡剤を気化させ被
覆部および微小孔質部としたものである特許請求
の範囲第１項記載のフイルター。[Scope of Claims] 1. A porous base material made of ceramic and having a large number of through holes, a covering portion that covers the inner surface of the porous base material forming the through holes, and at least one of the porous base materials forming the through holes. 1. A filter comprising a microporous part having a large number of micropores penetrating through passages of the part, and a water-repellent body made of fluororesin. 2. The water repellent body is produced by heating and baking a dispersion containing a fluororesin introduced into the through-holes of a porous base material and an organic blowing agent that decomposes and becomes a gas phase at a temperature below the baking temperature of the fluororesin. The filter according to claim 1, wherein the organic blowing agent is vaporized to form the coating portion and the microporous portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22878586A JPS6384614A (en) | 1986-09-26 | 1986-09-26 | Filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22878586A JPS6384614A (en) | 1986-09-26 | 1986-09-26 | Filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6384614A JPS6384614A (en) | 1988-04-15 |
| JPH031043B2 true JPH031043B2 (en) | 1991-01-09 |
Family
ID=16881808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22878586A Granted JPS6384614A (en) | 1986-09-26 | 1986-09-26 | Filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6384614A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE58909710D1 (en) * | 1988-06-04 | 1996-09-19 | Herding Entstaubung | Filters for separating solid particles from hot, gaseous or liquid media |
| JP2547252B2 (en) * | 1989-04-28 | 1996-10-23 | 日本碍子株式会社 | Chemically treated ceramic membrane |
| JP5008128B2 (en) * | 2006-03-03 | 2012-08-22 | シチズンファインテックミヨタ株式会社 | Porous cover and method for manufacturing the same |
-
1986
- 1986-09-26 JP JP22878586A patent/JPS6384614A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6384614A (en) | 1988-04-15 |
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