JPH04210203A - Filter cloth - Google Patents
Filter clothInfo
- Publication number
- JPH04210203A JPH04210203A JP40633090A JP40633090A JPH04210203A JP H04210203 A JPH04210203 A JP H04210203A JP 40633090 A JP40633090 A JP 40633090A JP 40633090 A JP40633090 A JP 40633090A JP H04210203 A JPH04210203 A JP H04210203A
- Authority
- JP
- Japan
- Prior art keywords
- melting point
- filter cloth
- point component
- fiber
- component
- 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
- 239000004744 fabric Substances 0.000 title claims abstract description 58
- 239000000835 fiber Substances 0.000 claims abstract description 48
- 238000002844 melting Methods 0.000 claims abstract description 39
- 230000008018 melting Effects 0.000 claims abstract description 35
- 239000000428 dust Substances 0.000 claims abstract description 22
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000003490 calendering Methods 0.000 claims abstract description 16
- 239000010802 sludge Substances 0.000 claims abstract description 5
- 229920001410 Microfiber Polymers 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 abstract description 24
- 229920000728 polyester Polymers 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 235000012970 cakes Nutrition 0.000 description 9
- -1 polyethylene Polymers 0.000 description 8
- 230000035699 permeability Effects 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 235000021463 dry cake Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- CXOFVDLJLONNDW-UHFFFAOYSA-N Phenytoin Chemical group N1C(=O)NC(=O)C1(C=1C=CC=CC=1)C1=CC=CC=C1 CXOFVDLJLONNDW-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010035 extrusion spinning Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007378 ring spinning Methods 0.000 description 1
Landscapes
- Filtering Materials (AREA)
Abstract
Description
［０００１］ [0001]
【産業上の利用分野】本発明は、特にフィルタープレス
用やバグフィルタ−用に好適な濾過布に関するものであ
る。
［０００２］BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth particularly suitable for filter presses and bag filters. [0002]
【従来の技術】従来の織物による濾過布、例えばフィル
タープレス用やバグフィルタ−用の濾過布としては、経
糸および緯糸にマルチフィラメントを用いたもの、経糸
および緯糸に紡績糸の撚糸を用いたものが汎用され、通
常濾過布の汚泥あるいはダストの供給側（以下表面側と
いう）の大部分が経糸によって覆われるように織成され
ている。とりわけ紡績糸の撚糸で織成された濾過布は、
比較的廉価であり柔軟性に富みかつ濾過精度に優れてい
ることからフィルタープレス用として好んで使用されて
いる。
［０００３］[Prior Art] Conventional woven filter cloths, such as filter cloths for filter presses and bag filters, use multifilament yarns for the warp and weft, and fabrics that use twisted spun yarn for the warp and weft yarns. is commonly used, and is usually woven so that most of the sludge or dust supply side (hereinafter referred to as the surface side) of the filter cloth is covered by warp threads. In particular, filter cloths woven from twisted spun yarns are
It is preferred for use in filter presses because it is relatively inexpensive, highly flexible, and has excellent filtration accuracy. [0003]
【発明が解決しようとする課題】ところが紡績糸の撚糸
によって構成された濾過布あるいは基布の表面に不織布
を積層してなる濾過布は、濾過精度に優れているがマル
チフィラメント糸による濾過布に比べてケーキの剥離性
が悪く、使用中に濾過速度が早期に低下するという不都
合を有している。
［０００４］またケーキの剥離性については例えば実開
昭６０−１７２２３号公報に記載されているように、不
織布の表層に鎖成分が低融点の芯−鞘型複合繊維の不織
布を重ね合わせ、表面側を加熱押圧して低融点成分を溶
融せしめて平滑化することによって改善することができ
るが、反面において表面側に樹脂膜のようなものが形成
されて濾過速度が大幅に低下するという問題点が生じる
。
［０００５１本発明は上記不都合や問題点が改善された
濾過布を提供するものである。
［０００６］[Problems to be Solved by the Invention] However, a filter fabric made of twisted spun yarn or a filter fabric made by laminating a nonwoven fabric on the surface of a base fabric has excellent filtration accuracy, but a filter fabric made of multifilament yarn has In comparison, it has the disadvantage that the cake peelability is poor and the filtration rate decreases early during use. [0004] Regarding the releasability of the cake, for example, as described in Japanese Utility Model Application Publication No. 60-17223, a nonwoven fabric of core-sheath type composite fibers whose chain component has a low melting point is superimposed on the surface layer of the nonwoven fabric, and the surface This can be improved by heating and pressing the side to melt the low melting point components and smooth it, but on the other hand, the problem is that a resin film is formed on the surface side, which significantly reduces the filtration rate. occurs. [00051] The present invention provides a filter cloth in which the above-mentioned disadvantages and problems are improved. [0006]
【課題を解決するための手段】本発明は、濾過布の少な
くとも表面側に低融点成分と高融点成分とからなる分割
型複合繊維が分割された極細繊維が存在し、その表面側
から熱カレンダーでもって押圧加熱処理されてなる。即
ち、本発明における濾過布は、低融点成分と高融点成分
とからなる分割型複合繊維が分割された０、５デニール
以下の極細繊維が少なくとも汚泥あるいはダストの供給
側の面の一部に存在し、その面に熱カレンダー加工が施
されて上記低融点成分が斑点状に溶融樹脂化されている
ことを特徴としている。
［０００７］上記した特徴を具備した濾過布は、低融点
成分と高融点成分とからり、分割後の太さが０．５デニ
ル以下の分割型複合繊維でもって糸条となしてその糸条
を少なくとも表面経糸に配して織成し、その織物を高圧
水流処理して該分割型複合繊維を分割し、乾燥後該織物
の表面に熱カレンダー加工を施して上記低融点成分を溶
融樹脂化することによって得ることができる。
［０００８］また他の手段として、上記分割型複合繊維
からなる低融点成分と高融点成分とからなる分割型複合
繊維のカードウェブを形成し、このウェブを高圧水流処
理して極細繊維に分割するとともに交絡させて不織布と
なし、次いでこの不織布を任意の濾過重用織物基布の表
面に重ね合わせてニードリングして一体化し、しかるの
ちその不織布面に熱カレンダー加工を施して上記分割繊
維の低融点成分を溶融樹脂化することによって得ること
ができる。
［０００９１本発明に適用される分割型複合繊維として
は、融点の異なる２成分からなる剥離型複合繊維が好ま
しい。そしてその構成成分としては、溶融紡糸可能な重
合体もしくは共重合体、例えばポリエチレン、ポリプロ
ピレン、ポリメチルペンテン、エチレン−ビニルアルコ
ール共重合体、エチレン−酢酸ビニル共重合体等のポリ
オレフィン系やポリエチレンテレフタレート、ポリブチ
レンテレフタレート等のポリエステル系、ナイロン６、
ナイロン６６、ナイロン１２等のポリアミド系、ポリ塩
化ビニル等の重合体もしくは共重合体の中から、融点の
異なる２成分以上を適宜選択するとよいが、とりわけ２
０℃以上の融点差を有する２成分で形成するとよい。
［００１０１分割型複合繊維の断面形状は種々なものが
考えられ特に限定を要するものではないが、中でも放射
繊状型が好ましく、かかる繊維を分割することによって
太さが０．５デニール以下の熱融着性の極細繊維を含む
糸条や不織布を得ることができる。そして０．５デニー
ル以下の低融点成分の極細繊維を含む糸条や不織布を表
面側に配し、熱カレンダー加工を施すことによって本発
明の濾過布が得られる。
［００１１１カレンダー加工の条件としては、低融点成
分の極細繊維の融点をｔ℃とすると、ロール温度Ｔ℃が
ｔ−１０≦Ｔ≦ｔ＋２０の範囲にある熱ロールと常温の
ロールとの２本のカレンダーロールを用い、濾過布の表
面側を熱ロール側となして線圧５０〜１００ ｋｇ／’
ｃｍ 、速度３〜７１でもって処理するとよい。
［００１２］ このような条件でカレンダー加工処理を
行うと濾過布の表面側の表層部の極細繊維の低融点成分
のみが溶融し＄を脂化して平滑性が良好となるとともに
高融点成分の極細繊維が溶融せずに残留しているため、
濾過速度に大きな影響を与えることなくケーキ剥離性を
向上させることができる。
［００１３］[Means for Solving the Problems] The present invention provides ultrafine fibers in which splittable conjugate fibers consisting of a low melting point component and a high melting point component are split at least on the surface side of a filter cloth, and thermal calendering is carried out from the surface side. It is then subjected to pressure and heat treatment. That is, in the filter cloth of the present invention, ultrafine fibers of 0.5 deniers or less, which are split split composite fibers consisting of a low melting point component and a high melting point component, are present at least in a part of the surface on the sludge or dust supply side. It is characterized in that its surface is thermally calendered to turn the low melting point component into a molten resin in spots. [0007] The filter cloth having the above-mentioned characteristics is made of splittable conjugate fibers that are composed of a low-melting point component and a high-melting point component, and whose thickness after splitting is 0.5 denyl or less. is arranged in at least the surface warp, the woven fabric is treated with high-pressure water to separate the splittable composite fibers, and after drying, the surface of the woven fabric is thermally calendered to convert the low melting point component into a molten resin. can be obtained by [0008] As another method, a carded web of splittable conjugate fibers consisting of a low melting point component and a high melting point component made of the above splittable conjugate fibers is formed, and this web is subjected to high pressure water jet treatment to split it into ultrafine fibers. Then, this nonwoven fabric is overlaid on the surface of an arbitrary filtration-heavy fabric base fabric and integrated by needling.Then, the surface of the nonwoven fabric is thermally calendered to reduce the low melting point of the split fibers. It can be obtained by melting the components into a resin. [00091 As the splittable conjugate fiber applied to the present invention, a peelable conjugate fiber consisting of two components having different melting points is preferable. Its constituent components include melt-spun polymers or copolymers, such as polyolefins such as polyethylene, polypropylene, polymethylpentene, ethylene-vinyl alcohol copolymers, ethylene-vinyl acetate copolymers, and polyethylene terephthalate; Polyesters such as polybutylene terephthalate, nylon 6,
Two or more components having different melting points may be appropriately selected from among polyamides such as nylon 66 and nylon 12, and polymers or copolymers such as polyvinyl chloride.
It is preferable to use two components having a difference in melting point of 0° C. or more. [00101 The cross-sectional shape of the splittable conjugate fiber can be various and does not need to be particularly limited, but among them, a radial fibrous type is preferable, and by splitting such a fiber, the fiber can be heated to a thickness of 0.5 denier or less. Yarns and nonwoven fabrics containing fusible ultrafine fibers can be obtained. Then, the filter cloth of the present invention is obtained by disposing threads or nonwoven fabric containing ultrafine fibers having a low melting point component of 0.5 denier or less on the surface side and subjecting the cloth to thermal calendering. [00111 The conditions for calendering are two rolls, a heated roll and a roll at room temperature, where the roll temperature T°C is in the range of t-10≦T≦t+20, assuming that the melting point of the ultrafine fiber as a low-melting point component is t°C. Using a calender roll, apply a linear pressure of 50 to 100 kg/' with the surface side of the filter cloth as the hot roll side.
It is preferable to process at a speed of 3 to 71 cm. [0012] When calendering is carried out under these conditions, only the low melting point components of the ultrafine fibers in the surface layer on the surface side of the filter cloth melt and become fat, resulting in good smoothness and the ultrafine fibers of the high melting point components. Because the fibers remain unmelted,
Cake removability can be improved without significantly affecting filtration speed. [0013]
【作用】濾過布の表面側の表層部に現れている低融点成
分の極細繊維のみが樹脂化されているため所定の濾過速
度を維持するとともに濾過作用時に付着したケーキを従
来よりも円滑に剥離できて濾過効率を向上させ、さらに
極細繊維の存在によって濾過精度を高める。
［００１４］[Action] Only the ultrafine fibers of the low-melting point components that appear on the surface layer of the filter cloth are made into resin, so the prescribed filtration speed can be maintained and the cake that adheres during filtration can be peeled off more smoothly than before. This improves filtration efficiency, and the presence of ultrafine fibers also increases filtration accuracy. [0014]
【実施例】実施例１・低融点成分（Ａ）としてポリプロ
ピレン、高融点成分（Ｂ）としてポリエステルを用い、
両成分の複合比Ａ：Ｂ＝１１とし、図３（イ）に示すよ
うな１６分割の放射線型の分割型複合繊維を紡糸温度２
９５℃で溶融押出紡糸を行い、８０℃の温水中で３倍延
伸をし、カッターで切断して太さ３デニール、長さ５１
１１１ｍの分割型複合繊維（１）を得た。
［００１５］次いでこの分割型複合繊維（１）を１００
重量％用いて目付が約１５０ｇ／１ＩＩ２のカードウェ
ブとし、吐水水圧１５０ｋｇ／ｃｍ”、速度３ｍ／ｍｉ
ｎで表裏かく２回水流処理を行い、乾燥して不織布シー
ト（２）となした。この処理により複合繊維（１）はＡ
成分繊維とＢ成分繊維とに分割され１両者共に太さ０．
１９デニールの極細繊維となっていた。
（００１６］上記不織布（２）を基布（３）の上に重ね
てニードルパンチングを行い、両者を一体化したのち不
織布シート（２）側を温度１７０℃の熱ローラ、裏面（
基布側）が常温のローラとなして線圧６０ｋｇ／ｃｍ
、速度５ｍ／ｍｉｎでもってカレンダー加工を行い、表
層の低融点成分繊維を溶融樹脂化（４）シて濾過布とな
した。なお基布（３）には太さ２デニール、長さ５１ｍ
ｍのポリプロピレン繊維の２４番手紡績糸（撚数５Ｔ／
１ｎｃｈ）による経糸密度５０本／１ｎｃｈ、緯糸密度
４１本／１ｎｃｈの綾織物を使用した。
［００１７］実施例２・実施例１の分割型複合繊維１０
０重量％を用いてリング紡績機により綿番手２４５の紡
績糸となし、この紡績系５本を撚加工機により合撚して
撚数０、５Ｔ、； １ｎｃｈの撚糸とした。そしてこの
撚糸を経糸（５）および緯糸（６）に用い経糸密度３３
本／１ｎｃｈ 、緯糸密度３３本／１ｎｃｈの図２に示
したような表裏が経綾織の織物を織成した。
［００１８］この織物の表面を占める経糸（３）の割合
は約７５％であった。次いでこの織物を吐出水圧１５０
ｋｇ’ｃＩｎ２、速度３ ｍ［＋１ ｉ ｎで表裏各２
回水流処理を行い分割型複合繊維を分割した。該繊維の
Ａ成分およびＢ成分は分割されてそれぞれ太さ０．１９
デニールの極細繊維となっていた。 しかるのちこの
表面側を上記熱ロール側として、ロール温度１７０℃、
線圧１００ｋｇ／ｃｍ、速度’Ｄ ｍｙ’ｍ Ｉ Ｈの
条件でカレンダー加工を施し、該撚糸経糸（５）の表層
部分を溶融樹脂化（４）シて濾過布となした。
［００１９”］実施例３・ 実施例１の分割型複合繊維
（１）を５０重量％と太さ２デニール、繊維長５１ｍｍ
のポリプロピレンの繊維５０重量％との混紡糸（綿番手
２４Ｓ）を紡績し、この混紡糸を５本撚合わせて経糸と
緯糸に用い、実施例２と同様に綾織物を織成しのち水流
処理を行い、その表面側に熱カレンダー加工を施して濾
過布となした。
［００２０１実施例４・実施例１の分割型複合繊維（１
）１００重量％のカードウェブをプレパンチングにより
目付１３０ｇ／ｍ２の不織布を作り、これを太さ２デニ
一ル繊維長５１ｍｍ、目付４００ｇ／ｍ２のポリエステ
ル二−ドル不織布の上に重ね合わせてニードルパンチン
グにより仮接合し、次いで分割型複合繊維不織布側から
、吐出水圧１８０ｋｇ／ｃｍ２にて２回水流処理して分
割型複合繊維を分割処理し、しかるのち上記同様に分割
繊維不織布側に熱カレンダー加工をおこなって濾過布と
なした。この濾過布の通気度は５ｍｌ／ｃｍ２／ｓｅｅ
であった。
［００２１１比較例１・実施例３における混紡糸の混紡
比を分割型複合繊維（１）を２０重量％、ポリプロピレ
ン繊維を８０重量％となし、この混紡糸を５本撚り合わ
せて経糸および緯糸に用いて実施例３と同じ綾織物を織
成し、同様に水流処理および熱カレンダー加工を施して
濾過布となした。
［００２２］比較例２・太さ２デニール、長さ４１ｍｍ
のポリエステル繊維用いて目付が約５００ｇ／１ｌ１２
の二−ドルパンチング不織布を作り、表面側ロール温度
２７０℃、線圧６０ｋｇ／ｃｍ、速度５ ｍ／ｍｉｎの
条件でカレンダー加工を施して濾過布となした。この濾
過布の通気度は１０ｍ１／ｃｍ２／ｓｅｅであった。
［００２３］上記実施例１〜３および比較例１の濾過布
をフィルタープレス用に用いて湿式濾過性能と湿式ケー
キ剥離性のテストを行った際の評価結果を[Example] Example 1 Using polypropylene as the low melting point component (A) and polyester as the high melting point component (B),
The composite ratio of both components A:B = 11, and the 16-split radiation-type split composite fiber as shown in Figure 3(a) was spun at a temperature of 2.
Melt extrusion spinning was performed at 95°C, stretched 3 times in warm water at 80°C, and cut with a cutter to a thickness of 3 denier and a length of 51 mm.
A 111 m long splittable composite fiber (1) was obtained. [0015] Next, this splittable composite fiber (1) was
A card web with a weight percent of approximately 150 g/1II2 was used, water pressure was 150 kg/cm, and speed was 3 m/mi.
Water treatment was carried out twice on the front and back sides using n, and the sheet was dried to obtain a nonwoven fabric sheet (2). Through this treatment, the composite fiber (1) becomes A
It is divided into component fiber and B component fiber, both of which have a thickness of 0.
It was made of 19 denier ultra-fine fiber. (0016) The nonwoven fabric (2) is layered on the base fabric (3) and needle punched to integrate the two, and then the nonwoven fabric sheet (2) side is heated with a heat roller at a temperature of 170°C, and the back side (
Linear pressure 60kg/cm when the base fabric side) is a roller at room temperature.
Calender processing was performed at a speed of 5 m/min to convert the low melting point component fibers in the surface layer into a molten resin (4) to obtain a filter cloth. The base fabric (3) has a thickness of 2 denier and a length of 51 m.
24 count spun yarn of polypropylene fiber (twist number 5T/
A twill fabric with a warp density of 50 threads/1 nch and a weft thread density of 41 threads/1 nch was used. [0017] Example 2/Splitable composite fiber 10 of Example 1
Using 0% by weight, a spun yarn with a cotton count of 245 was made using a ring spinning machine, and five of these spun yarns were combined and twisted using a twisting machine to obtain twisted yarns with a twist number of 0, 5T, and 1 nch. Then, this twisted yarn was used for the warp (5) and weft (6), and the warp density was 33.
A fabric with a warp twill weave on the front and back sides as shown in FIG. 2 with a weft density of 33 threads/1 nch and a weft density of 33 threads/1 nch was woven. [0018] The proportion of the warp (3) occupying the surface of this fabric was about 75%. This fabric was then discharged under a water pressure of 150
kg'cIn2, speed 3 m [+1 i n, front and back 2 each
The splittable conjugate fibers were split by water flow treatment. The A component and B component of the fiber are divided and each has a thickness of 0.19
It was made of ultra-fine denier fiber. Then, with this surface side as the hot roll side, the roll temperature was set to 170°C.
Calender processing was performed under the conditions of a linear pressure of 100 kg/cm and a speed of 'D my' m I H, and the surface layer portion of the twisted warp (5) was converted into a molten resin (4) to obtain a filter cloth. [0019''] Example 3 - 50% by weight of the splittable composite fiber (1) of Example 1, a thickness of 2 denier, and a fiber length of 51 mm.
A blended yarn (cotton count 24S) with 50% by weight of polypropylene fibers was spun, and five of these blended yarns were twisted together and used for the warp and weft, and a twill fabric was woven in the same manner as in Example 2, followed by water treatment. The surface side of the cloth was thermally calendered to obtain a filter cloth. [00201 Example 4/Splitable composite fiber of Example 1 (1
) A nonwoven fabric with a basis weight of 130 g/m2 was made by pre-punching a 100% carded web, and this was overlaid on a polyester needle nonwoven fabric with a thickness of 2 denier fibers of 51 mm and a basis weight of 400 g/m2, and then needle punched. The splittable conjugate fiber nonwoven fabric side was then subjected to water jet treatment twice at a discharge water pressure of 180 kg/cm2 to split the splittable conjugate fiber, and then the splittable conjugate fiber nonwoven fabric side was thermally calendered in the same manner as above. This was done to make a filter cloth. The air permeability of this filter cloth is 5ml/cm2/see
Met. [00211 The blending ratio of the blended yarns in Comparative Example 1 and Example 3 was 20% by weight of the splittable composite fiber (1) and 80% by weight of the polypropylene fiber, and five of these blended yarns were twisted to form warps and wefts. The same twill fabric as in Example 3 was woven using the same method as in Example 3, and the same water treatment and heat calendering were performed to obtain a filter cloth. [0022] Comparative Example 2 Thickness 2 denier, length 41 mm
The fabric weight is approximately 500g/1l12 using polyester fiber.
A needle-punched nonwoven fabric was prepared and calendered at a surface roll temperature of 270°C, a linear pressure of 60 kg/cm, and a speed of 5 m/min to obtain a filter cloth. The air permeability of this filter cloth was 10 m1/cm2/see. [0023] The evaluation results were obtained when the filter cloths of Examples 1 to 3 and Comparative Example 1 were tested for wet filtration performance and wet cake removability using filter presses.
【表１】
に示す。 また上記実施例４および比較例２の濾過布を
バグフィルタ−に用いて乾式濾過性能と乾式ケーキ隔離
性のテスト行った際の評価結果をIt is shown in [Table 1]. In addition, the evaluation results of dry filtration performance and dry cake isolation tests were conducted using the filter cloths of Example 4 and Comparative Example 2 as bag filters.
【表２】 に示す。 ｒｏ ０２４］[Table 2] Shown below. ro 024]
【表１】 ［００２５］[Table 1] [0025]
【表２】
［００２６］なお湿式濾過性能および湿式ケーキ剥離性
の評価は次のようにして行った。ダスト捕集率（％）：
関東ローム第７種を用いて２００■／Ｉ濃度（Ａ）の液
を作成し、濾過布９．６２ｃｍ２で濾過を行い、濾過後
の液濃度（Ｂ）を測定し、下記の式より算出した。
［００２７］ダスト捕集率（％） ＝ （Ａ−Ｂ） Ｘ
１００ ／、八
（００２８］濾過精度（μｍ）二上記で得られた濾液（
Ｂ）を超遠心式自動粒度分布装置（堀場製作所１製）で
狭雑粒子の径を測定し、その最大粒径とした。濾過速度
（１／ｍｉｎ ） ：濾過圧５ｋｇ／ｃｍ２とし、７
分間濾過液を通過させたときの総連過液量（Ｃ）を測定
し、下記の式より算出した。
［００２９］濾濾過塵（１／ｍ１ｎ） ＝Ｃ／７［０
０３０１ケーキ剥離性（級）：カリオン（関東化学■製
）の１０％水溶液を１１作成し、２０ｃｍ２で濾過を行
い乾燥後、剥離させ下記のように評価した。
１級：きれいに剥離する。
２級：剥離するが一部濾過布に残る。
３級：剥離できず殆どあるいは全て濾過布に残る。
［００３１１また乾式濾過性能および乾式ケーキ剥離性
の評価は次のようにして行った。ＪＩＳ試験試験用トス
８１０種用し、パルス型集塵試験機でテストした。該試
験機の条件は次の通り設定した。風量２．５ｍ２、濾過
面積０．６６ｍ、濾過速度３．８ ｍ／ｍｉｎ 、パル
ス間隔２分、０．１ｓｅｃ／１１１ルス、パルス圧３ｋ
ｇ／ｃｍ２、試験時間７ｈｒ、温度（室温）とし、加速
のためと一次付着層を形成するため、濾過布面圧力ΔＰ
が水柱１５０ｍｍに達するまでダストを払い落とさずに
行った。
（００３２］ダスト洩れ量（ｇ）：濾過布を通過したダ
ストを０．１μｍまで捕集可能な濾紙で捕集した重量。
３集塵効率（％）：ダスト供給機より入口ダスト濃度Ａ
（ｇ／ｍ３）を測定し、濾過布３を通過した風量と上
記タスト洩れ量により出口ダスト濃度Ｂ （ｖ’ｍ３）
を計算して下記の式により算出した。
［００３３］集塵効率（％）＝１−（Ｂ／Ａ）Ｘ１００
［００３４］通気性低下度（％）：上記試験前の通気度
Ｃ（ｍＬ’ｃｍ２／ｓｅｃ ）と試験後の通気度りとを
測定し、下記式により算出した。
［００３５１通気性低下度（％）＝１− （Ｄ／Ｃ）Ｘ
ｉ［００３６］圧力損失（水柱ｍｍ） ：上記試験で
ΔＰ＝１５０ｍｍ（水柱）後の最大値。
乾式ケーキ剥離性（ダスト付着量ｇ、ｍ’） ：上記
試験後の濾過布の重量を測定し、試験前の濾過布の重量
を差し引いたタスト重量。 （ダスト重量が少ない程剥
離性がよい。）
［００３７］[Table 2] [0026] Wet filtration performance and wet cake removability were evaluated as follows. Dust collection rate (%):
A solution with a concentration of 200 ■/I (A) was prepared using Kanto Rohm Type 7, filtered with a filter cloth of 9.62 cm2, and the concentration of the solution after filtration (B) was calculated using the following formula. . [0027] Dust collection rate (%) = (A-B) X
100/, 8 (0028) Filtration precision (μm) 2 Filtrate obtained above (
B) was measured for the diameter of narrow particles using an ultracentrifugal automatic particle size distribution device (manufactured by Horiba, Ltd. 1), and was taken as the maximum particle diameter. Filtration speed (1/min): Filtration pressure 5kg/cm2, 7
The total amount of continuous liquid (C) when the filtrate was passed for a minute was measured and calculated from the following formula. [0029] Filter filter dust (1/mln) = C/7[0
0301 Cake peelability (grade): 11 10% aqueous solutions of Karion (manufactured by Kanto Kagaku ■) were prepared, filtered through 20 cm2, dried, peeled, and evaluated as follows. Grade 1: Removes cleanly. Grade 2: Peels off, but some remains on the filter cloth. Grade 3: Cannot be peeled off and most or all of it remains on the filter cloth. [00311 In addition, dry filtration performance and dry cake peelability were evaluated as follows. Tests were conducted using 810 types of JIS test toss using a pulse type dust collection tester. The conditions of the test machine were set as follows. Air volume 2.5 m2, filtration area 0.66 m, filtration speed 3.8 m/min, pulse interval 2 minutes, 0.1 sec/111 Lus, pulse pressure 3k
g/cm2, test time 7 hr, temperature (room temperature), filter cloth surface pressure ΔP for acceleration and to form a primary adhesion layer.
The dust was not brushed off until the water column reached 150 mm. (0032) Dust leakage amount (g): Weight of dust that has passed through the filter cloth collected by a filter paper that can collect down to 0.1 μm. 3 Dust collection efficiency (%): Dust concentration A at the inlet from the dust supply machine
(g/m3), and the outlet dust concentration B (v'm3) is determined by the air volume passing through the filter cloth 3 and the above-mentioned tast leakage amount.
was calculated using the following formula. [0033] Dust collection efficiency (%) = 1-(B/A)X100
[0034] Degree of decrease in air permeability (%): The air permeability C (mL'cm2/sec) before the above test and the air permeability C after the test were measured, and calculated by the following formula. [00351 Air permeability reduction degree (%) = 1- (D/C)X
i[0036] Pressure drop (water column mm): Maximum value after ΔP=150 mm (water column) in the above test. Dry cake removability (dust adhesion amount g, m'): The dust weight is obtained by measuring the weight of the filter cloth after the above test and subtracting the weight of the filter cloth before the test. (The lower the dust weight, the better the releasability.) [0037]
【発明の効果】このように本発明の濾過布は、低融点成
分と高融点成分とからなる分割型複合繊維が分割された
０、５デニール以下の極細繊維が少なくとも汚泥あるい
はダストの供給側の面に５０重量％以上存在し、その面
に熱カレンダー加工が施されて上記低融点成分が溶融樹
脂化されて、その樹脂化部分が梨地状となっているから
、濾過精度、濾過速度、ダスト捕集率等を低下させるこ
となくケーキ剥離性が良好となり、ケーキの剥離作業が
円滑となって濾過効率を向上させることができる。Effects of the Invention As described above, the filter cloth of the present invention has ultrafine fibers of 0.5 deniers or less, which are split composite fibers composed of a low melting point component and a high melting point component, at least on the sludge or dust supply side. 50% by weight or more exists on the surface, and the surface is thermally calendered to convert the low melting point component into a molten resin, and the resinized portion has a matte finish, which improves filtration accuracy, filtration speed, and dust. The cake peeling property is improved without reducing the collection rate, etc., and the cake peeling operation becomes smooth, thereby improving the filtration efficiency.
【図１】表面側に不織布シートを配した濾過布の経糸方
向の断面図である。FIG. 1 is a cross-sectional view in the warp direction of a filter cloth with a nonwoven fabric sheet arranged on the front side.
【図２】織物濾過布の経糸方向の断面図である。FIG. 2 is a cross-sectional view of the woven filter cloth in the warp direction.
【図３】 （イ）図および（ロ）図は分割型複合繊維の
それぞれ拡大断面図である。FIG. 3 (A) and (B) are enlarged cross-sectional views of the splittable composite fiber.
１ 分割型複合繊維 ２ 不織布シート ３ 基布 ４ 溶融樹脂化 １０ 濾過布 1 Splitable composite fiber 2 Nonwoven fabric sheet 3 Base fabric 4. Molten resin conversion 10 Filter cloth
Claims (3)
複合繊維が分割された０．５デニール以下の極細繊維が
少なくとも汚泥あるいはダストの供給側の面に５０重量
％以上存在し、その面に熱カレンダー加工が施されて上
記低融点成分が溶融樹脂化されていることを特徴とする
濾過布。Claim 1: At least 50% by weight of ultrafine fibers of 0.5 denier or less, which are split split composite fibers consisting of a low melting point component and a high melting point component, are present on the supply side of the sludge or dust, and 1. A filter cloth, the surface of which is thermally calendered so that the low melting point component is converted into a molten resin.
複合繊維が分割された０．５デニール以下の極細繊維を
５０重量％以上含む糸条が少なくとも表面経糸に配して
織成され、その表面に熱カレンダー加工が施されて上記
低融点成分が溶融樹脂化されていることを特徴とする濾
過布。2. A yarn containing 50% by weight or more of ultrafine fibers of 0.5 denier or less, which are split split composite fibers consisting of a low melting point component and a high melting point component, is woven with at least the surface warp. A filter cloth, the surface of which is thermally calendered so that the low melting point component is converted into a molten resin.
分とからなる分割型複合繊維が分割された０．５デニー
ル以下の極細繊維を５０重量％以上含む不織布が積層さ
れ、その不織布面に熱カレンダー加工が施されて上記低
融点成分が溶融樹脂化されていることを特徴とする濾過
布。3. A nonwoven fabric containing 50% by weight or more of ultrafine fibers of 0.5 denier or less, which are split split composite fibers consisting of a low melting point component and a high melting point component, is laminated on the surface of the woven base fabric. A filter cloth characterized in that the nonwoven fabric surface is thermally calendered to convert the low melting point component into a molten resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40633090A JPH04210203A (en) | 1990-12-05 | 1990-12-05 | Filter cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40633090A JPH04210203A (en) | 1990-12-05 | 1990-12-05 | Filter cloth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04210203A true JPH04210203A (en) | 1992-07-31 |
Family
ID=18515939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40633090A Pending JPH04210203A (en) | 1990-12-05 | 1990-12-05 | Filter cloth |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04210203A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05192520A (en) * | 1992-01-22 | 1993-08-03 | Fujikoo:Kk | Filter cloth enhanced in collection efficiency and production thereof |
| KR100294437B1 (en) * | 1993-05-14 | 2001-10-24 | 고토 기치 | Cylindrical filter and its manufacturing method |
| DE102010025218A1 (en) * | 2010-06-23 | 2011-12-29 | Hydac Filtertechnik Gmbh | Filter material for fluids |
-
1990
- 1990-12-05 JP JP40633090A patent/JPH04210203A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05192520A (en) * | 1992-01-22 | 1993-08-03 | Fujikoo:Kk | Filter cloth enhanced in collection efficiency and production thereof |
| JPH0716570B2 (en) * | 1992-01-22 | 1995-03-01 | 株式会社フジコー | Filter cloth with high collection efficiency and method for producing the same |
| KR100294437B1 (en) * | 1993-05-14 | 2001-10-24 | 고토 기치 | Cylindrical filter and its manufacturing method |
| DE102010025218A1 (en) * | 2010-06-23 | 2011-12-29 | Hydac Filtertechnik Gmbh | Filter material for fluids |
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