JPS5982919A - Filter medium - Google Patents
Filter mediumInfo
- Publication number
- JPS5982919A JPS5982919A JP19507382A JP19507382A JPS5982919A JP S5982919 A JPS5982919 A JP S5982919A JP 19507382 A JP19507382 A JP 19507382A JP 19507382 A JP19507382 A JP 19507382A JP S5982919 A JPS5982919 A JP S5982919A
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- fiber density
- recess
- welded
- thickness
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
- B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
- B01D46/522—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with specific folds, e.g. having different lengths
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はエアフィルターエレメント用炉材、特に、繊維
密度勾配型不織布製フィルターエレメントを形成せしめ
るために特殊な構造特徴を具備せしめた炉材に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace material for an air filter element, and more particularly to a furnace material having special structural features for forming a filter element made of a gradient fiber density nonwoven fabric.
従来、繊維密度勾配型不織布のフィルターエレメントは
厚さ方向に繊維密度勾配を有する不ｍ 布ヲ７ イルタ
ーエレメントに収納される炉材の濾過面積を大きくし、
粉塵保持量を高めるために、ひだ折りして折畳むことに
より形成することが行なわれている。かかるひだ折り加
工の方法としては不織布に機械的な圧力ですしを付けそ
の部分を折り目とする方法や、不織布の厚さの半分程度
の幅の狭いすしを熱圧加工で付けその部分を折り目とす
る方法がとられているが、炉材の有効面積の確保という
点からすれば何れも満足すべき効果が得られていないの
が現状である。Conventionally, a filter element made of a fiber density gradient type nonwoven fabric has a fiber density gradient in the thickness direction.
In order to increase the amount of dust held, it has been formed by pleating and folding. Methods for such pleating include applying mechanical pressure to the nonwoven fabric and using that part as a crease, or applying heat and pressure to a narrow sushi that is about half the thickness of the nonwoven fabric, and using that part as a crease. However, the current situation is that none of these methods achieves satisfactory results from the viewpoint of securing the effective area of the furnace material.
即ち、第２図および第３図はかかる従来法により形成さ
れた不織布Ｐ拐の典型例の略断面図であるが、これらの
図より明らかな如く不織布１を折り曲げて形成した炉材
においていずれも山ひだの谷部２が詰った状態になった
り、山部３の周辺が圧縮変形を受けたりするのみならず
、ダーティサイド４やクリーンサイド５の空間の分配が
不適正で、クリーンサイド５が極端に狭くなるなど不織
布炉材の濾過面の有効な確保という点では決して十分な
ものではなく、ましてやエレメント当りの粉塵保持量は
満足のゆくものではなかった。このように不織布湿材の
ひだ折り形状が不十分である理由は不織布湿材の厚すカ
大きいことや繊、細密度勾配のためにフィルターエレメ
ントのクリーンサイドの層が高剛性でダーティサイドの
層が低剛性であるという繊維密度勾配型不織布湿材の本
来の性質によるためであった。That is, FIGS. 2 and 3 are schematic cross-sectional views of typical examples of nonwoven fabrics P formed by such conventional methods. Not only will the valleys 2 of the mountain folds become clogged and the periphery of the peaks 3 will be compressed and deformed, but the space on the dirty side 4 and clean side 5 will be improperly distributed, causing the clean side 5 to become clogged. The nonwoven fabric furnace material was not sufficient in terms of ensuring an effective filtration surface because it was extremely narrow, and even more so, the amount of dust retained per element was not satisfactory. The reason why the folded shape of the nonwoven dampening material is insufficient is that the thickness of the nonwoven dampening material is large, the fibers, and the fine density gradient make the layer on the clean side of the filter element highly rigid and the layer on the dirty side. This is due to the inherent property of fiber density gradient type nonwoven fabric damping material that it has low stiffness.
本発明は在来技術におけるこれらの欠点を解消すべくな
されたものであり、エレメントあたりの粉塵保持Ｂｌが
大きいびだ折り形状をもつ折畳み構造のフィルターエレ
メントの形成を可能ならしめる湿材を提供するものであ
る。The present invention has been made in order to eliminate these drawbacks in the conventional technology, and provides a moisture material that enables the formation of a filter element with a folded structure having a pleated shape with a large dust retention Bl per element. It is something.
即、ち、本発明は繊維密度が表面から裏面へ漸次増ＩＪ
ＩＩ Ｌ、ている繊維密度勾配型不織布の表面側に、該
不織布の長さ方向と直交する方向に該不織布の厚みの１
．５〜３．０倍の幅を有する融着凹部Ａおよび該不織布
の厚みの少なくとも０゜３倍の幅を有する融着凹部Ｂを
交互に一定の間隔をおいて形成ぜしめ、該融着部Δ、Ｂ
を折り目にして１）〒畳み可能になした湿材に関するも
のである。That is, according to the present invention, the fiber density gradually increases from the front surface to the back surface.
II L, on the surface side of the fiber density gradient nonwoven fabric, 1 of the thickness of the nonwoven fabric is
．． Welding recesses A having a width of 5 to 3.0 times and welding recesses B having a width of at least 0.3 times the thickness of the nonwoven fabric are formed alternately at regular intervals, Δ,B
1) This relates to a damp material that can be folded.
以下本発明と図面を参照して更に詳細に説明するに本発
明にかかる湿材１は繊維密度が表面（ダーティ→）・イ
ドの而）から裏面（クリーンサイドの而）へ漸次増加し
ている繊維密度勾配型の縦長の不織布をもって（１冑成
される。この不織布は熱可塑性合成樹脂繊維またはそれ
を含有する繊維材料からなるものである。また繊維密度
勾配は表面（流入側、即ちダーティサイドの面）の層で
繊維密度が小さく裏面（流出側、ｆｆ１ｌちクリーンサ
イドの面）の層で繊維密度が大きいことを意味し、この
勾配は段階的変化、連続的変化の何れであってもよい。The present invention will be explained in more detail below with reference to the drawings. In the wet material 1 according to the present invention, the fiber density gradually increases from the front surface (dirty →) to the back surface (clean side). This nonwoven fabric is made of a vertically elongated nonwoven fabric with a fiber density gradient type. This nonwoven fabric is made of thermoplastic synthetic resin fibers or a fiber material containing them. This means that the fiber density is low in the layer on the back side (outflow side, ff1l, clean side) layer, and the fiber density is high in the layer on the back side (outflow side, ff1l, clean side), and this gradient can be either a stepwise change or a continuous change. good.
この不織布の厚さは少なくとも１朧、好ましくは２乃至
５ｒＮｎである。The thickness of this nonwoven fabric is at least 1 mm, preferably 2 to 5 rNn.
涙紙などの均質な繊維密度の′Ｐ利の場合、機械的な圧
力によりすしを付け、後にその部分を折り目にしてひだ
折り加工すると山ひだは湾曲することなく直線的にジグ
ザグ形に折り畳みができるのに対し、繊維密度勾配型不
織布Ｐ利では、繊維密度の大きいクリーンサイドの層を
内側にして折畳む場合繊維密度の大きい層は鋭角に折れ
、繊維密度の小さいダーティサイドの層は第２図に示ｌ
〜だ如く変形を受けＰ利本来の繊。In the case of homogeneous fiber density, such as tear paper, if the sushi is attached using mechanical pressure and then the folded part is folded and folded, the folds will be folded straight into a zigzag shape without curving. On the other hand, when folding the fiber density gradient type nonwoven fabric with the clean side layer with a high fiber density inside, the layer with a high fiber density will fold at an acute angle, and the dirty side layer with a low fiber density will fold into the second layer. As shown in the figure
The original fibers of Puri have undergone deformation.
細密度が損われ、また、繊維密度の小さいダーティサイ
ドの１曽を内側にして折畳む場合繊維密度の大きい層は
折れることなく繊維密度の小さい層を包み込むようにＵ
字形に曲がることになり、山ひだは湾曲した形状を呈す
る。かかる形状の折畳み構造の場合には湿材の濾過面が
有効に働かないためにエレメント当りの粉塵保持爪は小
さくなってしまう。The fine density is lost, and when folded with the dirty side layer with a low fiber density inside, the layer with a high fiber density will wrap around the layer with a low fiber density without folding.
It bends into a letter shape, and the mountain folds take on a curved shape. In the case of a folding structure having such a shape, the filtration surface of the damping material does not work effectively, so the dust holding claws per element become small.
本発明は繊維密度勾配型不織布を用い７了がら上記の欠
点のない折畳み形状を可能ならしめるため不織布の表面
側に特定の凹部を形成ぜ１７めたものである。即ち第４
図に示す如く本発明の湿材１には繊維密度勾配型の縦長
の不織布の表面側（繊維密度の小さい側）に該不織布の
長さ方向と直交する方向に該不織布の厚みの１．５〜３
．０倍の幅を有する融着凹部Ａおよび該不織布の厚みの
少なくとも０．３倍（好ましくは０．５〜２．０倍）の
幅を有する融着凹部Ｂが交互に一定の間隔をおいて形成
されている。本発明においてはこれら四部の幅は重要な
要件となるものであり、これによってとのＰ ｋＡを折
畳んでフィルターエレメントとした場合、エレメント容
積あたりの粉塵保持量が最大限に発揮できるようになる
のである。なお、この２湿材を折畳んでフィルターエレ
メントとした場合四部Ａは山ひだの谷部に対応し、凹部
Ｂは山ひだの山部に対応するようになる。The present invention uses a fiber density gradient type nonwoven fabric and forms specific recesses on the surface side of the nonwoven fabric in order to enable a folded shape without the above-mentioned drawbacks. That is, the fourth
As shown in the figure, the wet material 1 of the present invention has a fiber density gradient type vertically elongated nonwoven fabric with a thickness of 1.5 mm on the surface side (lower fiber density side) in a direction perpendicular to the length direction of the nonwoven fabric. ~3
．． Welding recesses A having a width of 0 times and welding recesses B having a width of at least 0.3 times (preferably 0.5 to 2.0 times) the thickness of the nonwoven fabric are alternately spaced at regular intervals. It is formed. In the present invention, the width of these four parts is an important requirement, so that when the P kA is folded to form a filter element, the amount of dust held per element volume can be maximized. It is. Note that when these two wet materials are folded to form a filter element, the four parts A correspond to the valleys of the mountain folds, and the recesses B correspond to the peaks of the mountain folds.
かかる融着凹部の深ざは不織布の厚みの４０％以下、好
ましくは１０乃至３０％とする。The depth of such a welding recess is 40% or less, preferably 10 to 30%, of the thickness of the nonwoven fabric.
このような融着凹部は不織布の表面（ダーティ−サイド
の面）に対し熱圧加工、超音波ウェルダー加工、高周波
ウエルダー加工などの熱圧融着加工を施すことにより形
成させることができる。Such welding recesses can be formed by subjecting the surface (dirty side surface) of the nonwoven fabric to thermopressure welding processing such as thermopressure processing, ultrasonic welding processing, and high frequency welding processing.
また、これらの融着凹部の各々は第４図および第５図（
ａ）に示す如く一本の溝の形になるように形成せしめる
のが普通であるが、場合によっては第５図（ｂ） Ｉ
（Ｑ） ｌ （ｄ）に示す如く融着加工部６と非融着加
工部７が混在するパターンにすることも可能である。Moreover, each of these fusion recesses is shown in FIGS. 4 and 5 (
Usually, it is formed in the shape of a single groove as shown in a), but in some cases, it is formed in the form of a single groove as shown in Fig. 5(b) I
(Q) It is also possible to form a pattern in which the fused portions 6 and the non-fused portions 7 coexist as shown in (d).
」−記のような融着加工によって四部の底部およびそれ
に隣接する繊維密度の小さい繊維層部が繊維密度の大き
い繊維層部の側にフィルム状に固着されるようになる。By the fusion process as described above, the bottom of the four parts and the adjacent fibrous layer portion with a low fiber density are fixed to the side of the fibrous layer portion with a high fiber density in the form of a film.
この現象と前述の凹ｉ￥呪の特定の幅とが相まって、本
発明のン炉材を凹部Ａ、Ｅに沿って交互にひた折りする
と第１図に示す如く谷部および山部が湾曲することなく
直線的にジグザグ形に折畳むことができるようになり、
かくして理想的な形態のフィルターエレメントかえられ
るのである。This phenomenon is combined with the specific width of the concave portions described above, so that when the furnace material of the present invention is folded alternately along the concave portions A and E, the valley portions and peak portions are curved as shown in Fig. 1. Now you can fold it straight into a zigzag shape without having to
In this way, the ideal form of filter element can be changed.
かくしてえられるフィルターエレメントはひた折り形状
をもつ折畳み構造を有するので従来の１１１畳み１”１
１Ｉ″Ｉ造のフィルターエレメントと比較して、同じ不
織布を用いても、エレメント当りの粉（小保持（Ｕは格
段に大きくなる。このようにエレメント当りの粉塵保持
量が大きくなる理由はン炉材の山ひだの全面積に比べて
わずかな面積（融着加工された山ひだの谷部と山部のみ
）だけがＰ材として有効に働かなシー）だけでそれ以外
の部分は繊維密度勾配型不織布のもつ本来の濾過性能を
発揮することができるからであり、従来のこの種炉材に
みられるような山ひだの谷部と山部の周辺の濾過性能の
低下や、山ひだが重なったりするようなことが起らない
からである。The filter element obtained in this way has a folding structure with a folded shape, so it is different from the conventional 111 fold 1"1.
Compared to a filter element made of 1I''I, even if the same nonwoven fabric is used, the amount of dust retained per element (U) is significantly larger.The reason why the amount of dust retained per element is large is that Compared to the total area of the mountain folds of the material, only a small area (only the valleys and peaks of the fused mountain folds) is effective as a P material, and the rest has a fiber density gradient. This is because the original filtration performance of the molded nonwoven fabric can be demonstrated, and the filtration performance does not deteriorate around the valleys and peaks of the mountain folds, which is seen in conventional furnace materials of this kind, and the mountain folds overlap. This is because nothing like that will happen.
以下、本発明を実施例により、具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.
目付が３００ ？ ／ ｎｒで厚さが３．０叫のポリエ
ステルとレーヨンの繊維からなる三層積層の繊維型密度
勾配型不織布の表面部（繊維密度の小さい側）に表１に
示す如く融着凹部Ａ（Ｐ材の山ひだの谷部に相当する）
および融着凹部Ｂ（炉材の山ひだの山部に相当する）を
幅を種々変えて３５ ｍｍの一定間囚で超音波ウエルダ
ーによる融着加工により形成せしめた。なお何れの場合
も四部の深さは０．５ ｉｎとした。かくして得られた
ｐ材を四部に沿って折畳み幅１７０簡、奥行４０叫、高
さ５０ＷＩ！ｎの枠に収納し周囲を接着剤で固着しくな
お山数は表１に示すとおりであった）、実施例１，２お
よび比較例１ 、２．３゜４のフィルターエレメントを
作成した。これらのフィルターエレメントを用い試験風
量１ｃＪ／分、粉塵Ｌ′ｄ度Ｉ Ｙ ／ ｔｒｉ （ｙ
工５−Ｚ−８９０１による８種試験用ダストを使用）、
増加抵抗３００ｍｍ１（２ｏを寿命として粉塵試験を行
なった。結果を表１に示した。この結果から明らかなよ
うに清浄効率は実施例、比較例ともほとんど差がないが
、粉塵保持量は本発明の実施例１，２はいずれの比較例
よりも格段に大きかった。The weight is 300? As shown in Table 1, a fusion recess A (P (corresponds to the valleys of the mountain folds of the timber)
And welding recesses B (corresponding to the ridges of the ridges of the furnace material) were formed by fusion processing using an ultrasonic welder with various widths and a fixed length of 35 mm. In both cases, the depth of the four parts was 0.5 inch. Fold the thus obtained P material along the four parts to obtain a width of 170cm, a depth of 40cm, and a height of 50cm! Filter elements of Examples 1 and 2 and Comparative Example 1, each having a diameter of 2.3°4, were prepared. Using these filter elements, test air flow rate 1 cJ/min, dust L'd degree I Y / tri (y
(using type 8 test dust according to Engineering 5-Z-8901),
A dust test was conducted with an increased resistance of 300mm1 (2o) as the lifespan.The results are shown in Table 1.As is clear from the results, there is almost no difference in cleaning efficiency between the example and the comparative example, but the amount of dust retained is higher than that of the present invention. Examples 1 and 2 were significantly larger than any of the comparative examples.
表 １
実１血例１ ６ １．５ ２０ １３
０ ９９．２実施例２ ９’ １．５
１８ １２１ ９９．０比較例１ ３
１．５ ２０ ８８９９．１比較例２ １
２ １．５ ２０ ８９９８．９比較例３
９ ０．６ １８ ８５９９．０
比較例４ ３ ３．０ １８ ８０９
９．８次に上述の実施例１および比較例１における山数
のみを表２に示す如く変えて、実施例３４および比較例
５，６のフィルターエレメントを作成し、同一条件で粉
塵試験を行なった。参考のため融着凹部を形成せしめる
ことなく手作業でひだ析り加工したフィルターエレメン
トについても粉塵試験を行なった。これらの結果を表２
に示した。この結果から、山数を変えても本発明の優位
性は変わらず、また手作業で折り加工したフィルターエ
レメントである比較Ｖ／１１７も本発明実施例よりける
かに劣ることかＪＳｌめられ、ブこ。Table 1 Actual blood case 1 6 1.5 20 13
0 99.2 Example 2 9' 1.5
18 121 99.0 Comparative example 1 3
1.5 20 8899.1 Comparative Example 2 1
2 1.5 20 8998.9 Comparative Example 3
9 0.6 18 8599.0
Comparative example 4 3 3.0 18 809
9.8 Next, filter elements of Example 34 and Comparative Examples 5 and 6 were prepared by changing only the number of threads in Example 1 and Comparative Example 1 as shown in Table 2, and a dust test was conducted under the same conditions. Ta. For reference, a dust test was also conducted on a filter element that was manually pleated without forming any welded recesses. These results are shown in Table 2.
It was shown to. From this result, the superiority of the present invention does not change even if the number of threads is changed, and the comparison V/117, which is a manually folded filter element, is also much inferior to the example of the present invention. Buko.
表 ２
実施例３ ６ １．５ １８ １２７
９９．２実施例４ ６ １．５ ２
２ １２３ ９９．２比較例５ ３ １．
５ １６ ７０９９．０比較例６ ３
１．５ １８ ９３９９．．１比較例７
（手折り加工） １８ ７１９８．８Table 2 Example 3 6 1.5 18 127
99.2 Example 4 6 1.5 2
2 123 99.2 Comparative Example 5 3 1.
5 16 7099.0 Comparative example 6 3
1.5 18 9399. ．． 1 Comparative example 7
(Hand-folded) 18 7198.8
第１図は本発明の一実施態、（策の７戸材を用いてノ１
ｆ成したフィルターエレメントの斜視図、第２および３
図はそれぞれ従来の方法によりひた折り加工して形成し
たカゴ利の断面図１第４図は本発明の計４Ｊの一実施例
の斜視図、第５図（ａ） 、（ｂハ（ｃ）および（、ｊ
、）はそれぞ′れ本発明のン炉材における融着加工部の
パターンを示す１戸材の部分的路下面図である。
］ −−−ｔｐ利 ２−−一谷部３−−−山部
４−ｍ−ダーティサイドの空間７一−−
非融着加工ｔ％Ａ−−−融着凹部Ｂ −−−１，ｉ・１
：着口部
特許出願人 東洋紡績株式会社
同 日本電装株式会社
ｕ１Figure 1 shows one embodiment of the present invention, (1)
Perspective views of filter elements 2nd and 3rd
The figures are a cross-sectional view of a cage formed by folding by a conventional method. Fig. 4 is a perspective view of an embodiment of a total of 4J of the present invention, and Figs. ) and (,j
, ) are partial underside views of one housing material, each showing the pattern of the fused portion in the furnace material of the present invention. ] ---tpli 2--Ichiyabe 3---Yamabe 4-m-Dirty side space 71--
Non-fused processing t%A ---fused concave portion B ---1, i・1
: Initial patent applicant: Toyobo Co., Ltd. Nippondenso Co., Ltd. u1
Claims (1)
配型不織布の表面側に、該不織布の長さ方向と直交する
方向に該不織布の厚みの１．５〜３．０倍の幅を有する
融着凹部（Ａ）および該不織布の厚みの少なくとも０．
３倍の幅を有する融着凹部（Ｂ）を交互に一定の間隔を
おいて形成せしめ、該融着部（Ａ） 、 ＣＢ）を折り
目にして折畳み可能になした炉材。A fiber density gradient type nonwoven fabric in which the fiber density gradually increases from the front side to the back side has a width on the front side that is 1.5 to 3.0 times the thickness of the nonwoven fabric in a direction perpendicular to the length direction of the nonwoven fabric. The thickness of the fusion recess (A) and the nonwoven fabric is at least 0.
A furnace material in which fused concave portions (B) having three times the width are formed alternately at regular intervals, and the fused portions (A) and CB) are folded into folds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19507382A JPH0245485B2 (en) | 1982-11-05 | 1982-11-05 | ROZAI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19507382A JPH0245485B2 (en) | 1982-11-05 | 1982-11-05 | ROZAI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5982919A true JPS5982919A (en) | 1984-05-14 |
| JPH0245485B2 JPH0245485B2 (en) | 1990-10-09 |
Family
ID=16335099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19507382A Expired - Lifetime JPH0245485B2 (en) | 1982-11-05 | 1982-11-05 | ROZAI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0245485B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0214709A (en) * | 1988-04-18 | 1990-01-18 | Cambridge Filter Corp | Formation of air filter medium |
| WO1998017573A1 (en) * | 1996-10-18 | 1998-04-30 | Filterwerk Mann+Hummel Gmbh | Device for folding a web of material |
| EP1867377A1 (en) | 2006-06-12 | 2007-12-19 | helsa-automotive GmbH & Co. KG | Filter device and method for its manufacture |
| WO2009143674A1 (en) * | 2008-05-30 | 2009-12-03 | 诺维克贸易2008有限责任公司 | Mesh fabric and its manufacturing method |
| EP2332630A1 (en) | 2009-11-18 | 2011-06-15 | Covidien AG | Filter for a breathing circuit |
| US9808752B2 (en) | 2008-02-04 | 2017-11-07 | Donaldson Company, Inc. | Method and apparatus for forming fluted filtration media |
| US9855519B2 (en) | 2008-07-25 | 2018-01-02 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US10058812B2 (en) | 2010-01-25 | 2018-08-28 | Donaldson Company, Inc. | Pleated filtration media having tapered flutes |
| US10363513B2 (en) | 2009-08-03 | 2019-07-30 | Donaldson Company, Inc. | Method and apparatus for forming fluted filtration media having tapered flutes |
| US10525397B2 (en) | 2007-06-26 | 2020-01-07 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US10786774B2 (en) | 2007-02-02 | 2020-09-29 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
-
1982
- 1982-11-05 JP JP19507382A patent/JPH0245485B2/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0214709A (en) * | 1988-04-18 | 1990-01-18 | Cambridge Filter Corp | Formation of air filter medium |
| WO1998017573A1 (en) * | 1996-10-18 | 1998-04-30 | Filterwerk Mann+Hummel Gmbh | Device for folding a web of material |
| EP1867377A1 (en) | 2006-06-12 | 2007-12-19 | helsa-automotive GmbH & Co. KG | Filter device and method for its manufacture |
| US10786774B2 (en) | 2007-02-02 | 2020-09-29 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
| US10525397B2 (en) | 2007-06-26 | 2020-01-07 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US11298645B2 (en) | 2007-06-26 | 2022-04-12 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US9808752B2 (en) | 2008-02-04 | 2017-11-07 | Donaldson Company, Inc. | Method and apparatus for forming fluted filtration media |
| WO2009143674A1 (en) * | 2008-05-30 | 2009-12-03 | 诺维克贸易2008有限责任公司 | Mesh fabric and its manufacturing method |
| US9855519B2 (en) | 2008-07-25 | 2018-01-02 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US10946313B2 (en) | 2008-07-25 | 2021-03-16 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US10363513B2 (en) | 2009-08-03 | 2019-07-30 | Donaldson Company, Inc. | Method and apparatus for forming fluted filtration media having tapered flutes |
| EP2332630A1 (en) | 2009-11-18 | 2011-06-15 | Covidien AG | Filter for a breathing circuit |
| US10058812B2 (en) | 2010-01-25 | 2018-08-28 | Donaldson Company, Inc. | Pleated filtration media having tapered flutes |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0245485B2 (en) | 1990-10-09 |
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