JP3384415B2 - Needle punching felt for clarification filtration - Google Patents

Needle punching felt for clarification filtration

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Publication number
JP3384415B2
JP3384415B2 JP27631693A JP27631693A JP3384415B2 JP 3384415 B2 JP3384415 B2 JP 3384415B2 JP 27631693 A JP27631693 A JP 27631693A JP 27631693 A JP27631693 A JP 27631693A JP 3384415 B2 JP3384415 B2 JP 3384415B2
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JP
Japan
Prior art keywords
needle punching
fiber
filtration
felt
webs
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 - Fee Related
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JP27631693A
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Japanese (ja)
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JPH07124427A (en
Inventor
二平 馬場
純一 白居
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Shikibo Ltd
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Shikibo Ltd
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Filing date
Publication date
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Priority to JP27631693A priority Critical patent/JP3384415B2/en
Publication of JPH07124427A publication Critical patent/JPH07124427A/en
Application granted granted Critical
Publication of JP3384415B2 publication Critical patent/JP3384415B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 【0001】 【産業上の利用分野】本発明は、微細粒子、特に粒径
0.05〜5μmの微細粒子を含有するスラリーから微
細粒子を分離するために使用される清澄ろ過用ニードル
パンチングフェルトに関するものである。 【0002】 【従来の技術】ニードルパンチングフェルトは、スラリ
ーから微細粒子を分離する固液分離用ろ材に適用されて
久しく、その多孔性による処理能力の高さは、経緯糸を
交絡させて製織した織クロスの及ばない場合もある。 【0003】通常、ニードルパンチングフェルトは、図
3に示すように、織布よりからなる補強用基布(1)の
上下両面に、それぞれカーディングによって単位面積当
り重量や繊維配列を整えられた繊維層よりからなるウェ
ッブ(2a)(2b)を配し、その上下からトゲの付い
た多数の針で突き刺してニードルパンチング処理を施す
ことにより、基布(1)とウェッブ(2a)(2b)の
繊維を交絡させて一体化した後、上ウェッブ(2a)の
表面(2a’)の毛羽を溶融プレスして毛焼きし、更に
カレンダー加工で鏡面処理してなるものである。この具
体例として例えば実開昭54−29475号公報、特開
昭59−166225号公報、実公平5−5926号公
報に記載のものが挙げられる。 【0004】この種のニードルパンチングフェルトを緻
密化して清澄ろ過に適用可能なものを得ようとすれば、
ポリエステルを素材とした場合、基布(1)およびウェ
ッブ(2a)(2b)の構成の1例は下記の表1の通り
である。 【0005】 【表1】 上記構成の基布(1)およびウェッブ(2a)(2b)
よりからなる繊維集合体に、その上下から#35〜#4
0のレギュラーバーブニードルで700回/cm2のニ
ードルパンチング処理を施し、その上ウェッブ(2a)
の表面(2a’)の毛羽を毛焼き後、カレンダー仕上げ
を施すことにより目的のニードルパンチングフェルトが
でき上がる。この場合、ニードルパンチングフェルトの
緻密度はウェッブ(2a)(2b)の繊維と基布(1)
の交絡によっていて、ろ過孔径は最大で50μm程度と
なり、平均では30μm程度となる。 【0006】 【発明が解決しようとする課題】ところで、清澄ろ過用
ろ材では、最大のろ過孔径を小さくしなければ初期ろ過
の段階から長時間に亘り清澄なろ液を得ないままになっ
て作業能率が著しく低下する。 【0007】ところが、前述の清澄ろ過用と称された従
来のニードルパンチングフェルトでは、ろ過孔径の最大
が50μm程度であるため、とても上記問題を解決し得
るものではなかった。 【0008】従って、前述の清澄ろ過用と称された従来
のニードルパンチングフェルトでは、ろ過孔径の最大径
が50μm程度で微細な通液孔ができないため、とても
上記問題を解決し得るものではなかった。 【0009】一方、ウレタンフォームの孔径を微細にし
たろ材で最大孔径を1μm以下のものも実用化されてい
るが、これは耐熱、耐酸、耐アルカリ等で限界があり、
広い範囲で対応できるものではない。 【0010】本発明は、従来のニードルパンチングフェ
ルトでは達成できなかった微細粒子を含有するスラリー
の清澄ろ過を酸性領域およびアルカリ領域に亘って可能
にする新規な構造のニードルパンチングフェルトを提供
するものである。 【0011】 【課題を解決するための手段】上記課題の解決手段とし
て本発明は、補強用基布の上下両面に、それぞれメルト
ブローン不織布を配し、更にその両面に通常の繊維およ
び低融点繊維を含む複合繊維を混用させた混合繊維層を
配し、それをニードルパンチング処理後、一対の加熱ロ
ーラでニップ鏡面化処理を施したものである。 【0012】 【作用】本発明によれば、補強用基布と低融点繊維を含
む複合繊維を混用させた混合繊維層との間にメルトブロ
ーン不織布を配したから、熱処理後は混合繊維層に混用
された複合繊維の低融点繊維とメルトブローン不織布と
の相互作用で非常に微細な通液孔が形成され、この微細
な通液孔によりろ過初期の段階から清澄なろ過が可能で
ある。 【0013】 【実施例】以下、本発明の図面に示す実施例に基づいて
説明する。 【0014】図1は本発明の清澄ろ過用ニードルパンチ
ングフェルトの一実施例を示す断面図であり、(11)は
織布よりからなる補強用基布、(12a)(12b)はメル
トブローン方式で製作された超ファインマイクロファイ
バーの不織布よりからなる不織布層、(13a)(13b)
はカーディングによって単位面積当り重量や繊維配列が
整えられた通常の繊維および低融点繊維を含む複合繊維
とを混用している混合繊維層よりからなるウェッブであ
る。 【0015】本発明のニードルパンチングフェルトは、
補強用基布(11)の上下両面に不織布層(12a)(12
b)を配し、更にその両面にウェッブ(13a)(13b)
を配してその上下からニードルパンチング処理を施すこ
とにより、基布(11)とウェッブ(13a)(13b)の繊
維を交絡させて一体化すると同時に、基布(11)とウェ
ッブ(13a)(13b)の繊維の交絡を介して不織布層
(12a)(12b)を固定し、次いでこれをウェッブ(13
a)(13b)に混用された低融点繊維の軟化点より高温
で、かつ、通常の繊維の軟化点近辺の温度に設定された
一対の加熱ローラの間に導入してニップ鏡面化処理を施
すことにより、ウェッブ(13a)(13b)の低融点繊維
を溶融軟化させて基布(11)とウェッブ(13a)(13
b)の繊維の交絡を更に強固にし、かつ、上ウェッブ
(12a)の表面(12a’)の毛羽を溶融させながら当該
表面(12a’)を平滑化するとともに厚さ方向に圧密し
てなるものである。尚、一対の加熱ローラの間への導入
に先立ち、必要に応じて熱風または加熱ローラ等で予熱
あるいはプリセットを施して予め熱処理効果を高めてお
くと、ニップ鏡面化処理に有効である。 【0016】本発明のニードルパンチングフェルトによ
れば、基布(11)と低融点繊維を含む複合繊維が混用さ
れたウェッブ(12a)(12b)との間に、それぞれメル
トブローン方式で製作された超ファインマイクロファイ
バーの不織布よりからなる不織布層(12a)(12b)を
配しているから、不織布層(12a)(12b)とウェッブ
(13a)(13b)に混用された複合繊維の低融点繊維と
の相互作用によって熱処理後に非常に微細な通液孔が形
成され、この微細な通液孔により微細粒子を含有するス
ラリーでも初期ろ過の段階から清澄なろ液を得ることが
できる。 【0017】また、繊維は耐酸性、耐アルカリ性に優れ
ているので、酸性領域およびアルカリ領域の略全般に亘
って微細粒子を含有するスラリーの清澄ろ過を可能にす
ることができる。 【0018】次に、本出願人は従来例、比較例およびこ
の発明の実施例のニードルパンチングフェルトについて
特性比較を行なった。 【0019】尚、ここで従来例のニードルパンチングフ
ェルトとは、図3に示す構造のものであり、基布(1)
およびウェッブ(2a)(2b)の構成は上記表1の通
りである。 【0020】また、比較例のニードルパンチングフェル
トとは、図2に示すように、補強用基布(21)の上下両
面にカーディングによって単位面積当り重量や繊維配列
が整えられた通常の繊維および低融点繊維を含む複合繊
維とを混用している混合繊維層よりからなるウェッブ
(22a)(22b)を配し、その上下からニードルパンチ
ング処理を施すことにより基布(21)とウェッブ(22
a)(22b)の繊維を交絡させて一体化し、次いでこれ
をウェッブ(22a)(22b)に混用された低融点繊維の
軟化点より高温で、かつ、通常の繊維の軟化点近辺の温
度に設定された一対の加熱ローラの間に導入してニップ
鏡面化処理を施すことにより、ウェッブ(22a)(22
b)の低融点繊維を溶融軟化させて基布(21)とウェッ
ブ(22a)(22b)の繊維の交絡を更に強固にし、か
つ、上ウェッブ(22a)の表面(22a’)の毛羽を溶融
させながら当該表面(22a’)を平滑化するとともに厚
さ方向に圧密してなるものであり、基布(21)およびウ
ェッブ(22a)(22b)の構成は下記表2の通りであ
る。尚、比較例のニードルパンチフェルトの具体例とし
て例えば実公平1−43135号公報、特公平2−48
286号公報のものが挙げられる。 【0021】 【表2】 更に、この発明の実施例のニードルパンチングフェルト
とは、図1に示す構造のものであり、基布(11)、不織
布層(12a)(12b)およびウェッブ(13a)(13b)
の構成は下記表3の通りである。 【0022】 【表3】 従来例、比較例およびこの発明の実施例のニードルパン
チングフェルトについて特性比較を行なった結果は、下
記表4の通りである。 【0023】 【表4】 この処でろ過時間とは、0.05μm×1.5μmの針
状フェライト粒子を5%濃度に分散したスラリー100
ccを3kg/cm2の圧力でろ過面積20cm2のろ材
でろ過した時の脱水終了までの時間である。 【0024】上記表4から判るように、本発明の実施例
のニードルパンチングフェルトは、濾過孔径の最大およ
び平均が小さくなって極めて良好な清澄ろ過を可能に
し、しかも、従来例のものと比較して処理能力に差がな
い。 【0025】 【発明の効果】以上説明したように、本発明によれば、
補強用基布と低融点繊維を含む複合繊維を混用させた混
合繊維層との間にメルトブローン不織布を配するととも
に、熱処理により混合繊維層に混用された複合繊維の低
融点繊維を溶融させるから、低融点繊維の溶融とメルト
ブローン不織布との相互作用で非常に微細な通液孔が形
成でき、この微細な通液孔によって微細粒子を含有する
スラリーでもろ過初期の段階から清澄なろ液を得ること
ができて生産性の向上が図れる。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for separating fine particles from a slurry containing fine particles, particularly fine particles having a particle size of 0.05 to 5 μm. It relates to a needle punching felt for clarification filtration. 2. Description of the Related Art Needle punching felt has long been used as a filter medium for solid-liquid separation for separating fine particles from slurry, and has a high processing ability due to its porosity. In some cases, the woven cloth does not reach. Usually, as shown in FIG. 3, a needle punching felt is a fiber whose weight per unit area and fiber arrangement are adjusted on both upper and lower surfaces of a reinforcing base fabric (1) made of a woven fabric by carding. The webs (2a) and (2b) composed of layers are arranged, and pierced from above and below with a large number of needles with barbs to perform a needle punching process, whereby the base fabric (1) and the webs (2a) and (2b) are cut. After the fibers are entangled and integrated, the fluff on the surface (2a ') of the upper web (2a) is melt-pressed, fuzzed, and mirror-finished by calendering. Specific examples thereof include those described in Japanese Utility Model Application Laid-Open No. 54-29475, Japanese Patent Application Laid-Open No. Sho 59-166225, and Japanese Utility Model Application Laid-Open No. 5-5926. In order to obtain a needle-punching felt of this type that is suitable for clarification and filtration,
When polyester is used as a material, an example of the configuration of the base fabric (1) and the webs (2a) (2b) is as shown in Table 1 below. [Table 1] Base fabric (1) and webs (2a) (2b) having the above configuration
# 35 to # 4 from above and below
The needle punching process is performed 700 times / cm 2 with a regular barb needle of 0, and the web (2a)
After fuzzing the fluff on the surface (2a '), the target needle punching felt is completed by calendering. In this case, the densities of the needle punching felt are the fibers of the webs (2a) and (2b) and the base fabric (1).
And the filtration pore diameter is about 50 μm at the maximum, and is about 30 μm on average. [0006] By the way, in the case of a filter medium for clarifying filtration, unless the maximum filtration pore diameter is reduced, a clear filtrate cannot be obtained for a long period of time from the initial filtration stage. Is significantly reduced. However, in the conventional needle punching felt referred to for clarifying filtration, the above problem cannot be solved very much because the maximum filtration hole diameter is about 50 μm. Therefore, in the conventional needle punching felt referred to for clarifying filtration, the above problem cannot be solved very much because the maximum diameter of the filtration hole is about 50 μm and a fine liquid passage hole cannot be formed. . On the other hand, a filter medium having a maximum pore diameter of 1 μm or less has been put to practical use, which has a limit in heat resistance, acid resistance, alkali resistance, and the like.
It is not something that can be handled in a wide range. The present invention provides a needle punching felt having a novel structure that enables clarification and filtration of a slurry containing fine particles over an acidic region and an alkaline region, which cannot be achieved by a conventional needle punching felt. is there. [0011] As a means for solving the above-mentioned problems, the present invention provides a melt-blown nonwoven fabric on both upper and lower surfaces of a reinforcing base fabric, and furthermore, a normal fiber and a low-melting fiber on both surfaces. A mixed fiber layer in which mixed conjugate fibers are mixed is disposed, and after a needle punching treatment, a nip mirror surface treatment is performed with a pair of heating rollers. According to the present invention, the melt blown nonwoven fabric is disposed between the reinforcing base fabric and the mixed fiber layer in which the composite fiber containing the low melting point fiber is mixed. Interaction between the low-melting fiber of the conjugated fiber and the melt-blown nonwoven fabric forms very fine liquid-passing holes, and the fine liquid-passing holes enable clear filtration from the initial stage of filtration. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the needle punching felt for clarification filtration of the present invention. (11) is a reinforcing base cloth made of woven cloth, and (12a) and (12b) are melt blown types. Non-woven fabric layer made of non-woven fabric of manufactured ultra-fine microfiber,
Is a web composed of a mixed fiber layer in which normal fibers whose weight per unit area and fiber arrangement are adjusted by carding and composite fibers including low-melting fibers are mixed. [0015] The needle punching felt of the present invention comprises:
The nonwoven fabric layers (12a) (12
b) and webs (13a) (13b) on both sides
And by performing needle punching from above and below, the fibers of the base fabric (11) and the webs (13a) and (13b) are entangled and integrated, and at the same time, the base fabric (11) and the web (13a) ( The non-woven fabric layers (12a) and (12b) are fixed through the entanglement of the fibers of 13b), and then the webs (13
a) A nip mirror surface treatment is performed by introducing the material between a pair of heating rollers set at a temperature higher than the softening point of the low melting point fiber mixed in (13b) and at a temperature near the normal softening point of the fiber. As a result, the low-melting fibers of the webs (13a) and (13b) are melt-softened to form the base fabric (11) and the webs (13a) (13).
b) the fiber entanglement is further strengthened, and the surface (12a ') of the upper web (12a) is smoothed while the fuzz on the surface (12a') is melted, and the fiber is compacted in the thickness direction. It is. Prior to the introduction between the pair of heating rollers, preheating or presetting with hot air or a heating roller as necessary to enhance the heat treatment effect in advance is effective for the nip mirror surface treatment. According to the needle-punching felt of the present invention, the melt-blown ultra-fine fabric is used between the base cloth (11) and the webs (12a) and (12b) in which the composite fibers containing the low melting point fibers are mixed. Since the nonwoven fabric layers (12a) and (12b) made of fine microfiber nonwoven fabric are provided, the low melting point fibers of the composite fibers mixed in the nonwoven fabric layers (12a) and (12b) and the webs (13a) and (13b) can be used. After the heat treatment, very fine liquid-passing holes are formed by the interaction between the particles, and a fine filtrate can be obtained from the initial filtration stage even in a slurry containing fine particles by the fine liquid-passing holes. Further, since the fiber is excellent in acid resistance and alkali resistance, it is possible to clarify and filter a slurry containing fine particles over substantially the entire acidic region and alkaline region. Next, the applicant has compared the characteristics of the needle punching felts of the conventional example, the comparative example and the example of the present invention. Here, the conventional needle punching felt has the structure shown in FIG.
The configurations of the webs (2a) and (2b) are as shown in Table 1 above. As shown in FIG. 2, the needle-punched felt of the comparative example is composed of ordinary fibers whose weight per unit area and fiber arrangement are adjusted on both upper and lower surfaces of a reinforcing base cloth (21) by carding. A web (22a) (22b) composed of a mixed fiber layer mixed with a conjugate fiber including a low-melting fiber is arranged, and needle punching is performed from above and below the base fabric (21) and the web (22).
a) The fibers of (22b) are entangled and integrated, and then heated to a temperature higher than the softening point of the low-melting fiber mixed in the webs (22a) and (22b) and near the softening point of ordinary fibers. The web (22a) (22) is introduced between the set pair of heating rollers and subjected to a nip mirror surface treatment.
b) The low melting point fiber is melt-softened to further strengthen the entanglement of the fibers of the base cloth (21) and the webs (22a) and (22b), and the fuzz on the surface (22a ') of the upper web (22a) is melted. The surface (22a ') is smoothed while being compacted in the thickness direction, and the structures of the base cloth (21) and the webs (22a) (22b) are as shown in Table 2 below. In addition, as a specific example of the needle punch felt of the comparative example, for example, Japanese Utility Model Publication No.
No. 286. [Table 2] Further, the needle punching felt according to the embodiment of the present invention has the structure shown in FIG. 1, and includes a base cloth (11), nonwoven fabric layers (12a) (12b), and webs (13a) (13b).
Is as shown in Table 3 below. [Table 3] Table 4 below shows the results of a characteristic comparison of the needle punching felts of the conventional example, the comparative example, and the example of the present invention. [Table 4] Here, the filtration time refers to a slurry 100 in which needle-like ferrite particles of 0.05 μm × 1.5 μm are dispersed to a concentration of 5%.
This is the time until dehydration is completed when cc is filtered at a pressure of 3 kg / cm 2 through a filter medium having a filtration area of 20 cm 2 . As can be seen from Table 4 above, the needle punching felt according to the embodiment of the present invention has a reduced maximum and average filtration hole diameter, enables extremely good clarification filtration, and has a further advantage over the conventional one. No difference in processing capacity. As described above, according to the present invention,
While disposing the melt blown nonwoven fabric between the reinforcing base fabric and the mixed fiber layer in which the conjugate fiber containing the low-melting fiber is mixed, and melting the low-melting fiber of the conjugate fiber mixed in the mixed fiber layer by heat treatment, Due to the interaction between the melting of the low-melting fiber and the melt-blown nonwoven fabric, very fine liquid-passing holes can be formed, and the fine liquid-passing holes can provide a clear filtrate from the initial stage of filtration even in a slurry containing fine particles. It can improve productivity.

【図面の簡単な説明】 【図1】本発明の清澄ろ過用ニードルパンチングフェル
トの実施例を示す断面図である。 【図2】比較例のニードルパンチングフェルトを示す断
面図である。 【図3】従来例のニードルパンチングフェルトを示す断
面図である。 【符号の説明】 11 補強用基布 12a 上不織布層 12b 下不織布層 13a 上ウェッブ 13b 下ウェッブ
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a needle punching felt for clarification filtration of the present invention. FIG. 2 is a sectional view showing a needle punching felt of a comparative example. FIG. 3 is a sectional view showing a conventional needle punching felt. [Description of Signs] 11 Reinforcement base cloth 12a Upper non-woven fabric layer 12b Lower non-woven fabric layer 13a Upper web 13b Lower web

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B01D 39/00 - 39/20 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B01D 39/00-39/20

Claims (1)

(57)【特許請求の範囲】 【請求項1】 補強用基布の上下両面にメルトブローン
不織布を配し、更にその両面に通常の繊維および低融点
繊維を含む複合繊維とを混用させた混合繊維層を配し、
それをニードルパンチング処理後、一対の加熱ローラで
ニップ鏡面化処理を施したことを特徴とする清澄ろ過用
ニードルパンチングフェルト。
(57) [Claim 1] A mixed fiber obtained by disposing a melt-blown nonwoven fabric on both upper and lower surfaces of a reinforcing base fabric, and further mixing a normal fiber and a composite fiber including a low melting point fiber on both surfaces. Arrange layers,
A needle punching felt for clarification filtration, which is subjected to a needle punching treatment and then subjected to a nip mirror surface treatment with a pair of heating rollers.
JP27631693A 1993-11-05 1993-11-05 Needle punching felt for clarification filtration Expired - Fee Related JP3384415B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27631693A JP3384415B2 (en) 1993-11-05 1993-11-05 Needle punching felt for clarification filtration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27631693A JP3384415B2 (en) 1993-11-05 1993-11-05 Needle punching felt for clarification filtration

Publications (2)

Publication Number Publication Date
JPH07124427A JPH07124427A (en) 1995-05-16
JP3384415B2 true JP3384415B2 (en) 2003-03-10

Family

ID=17567758

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27631693A Expired - Fee Related JP3384415B2 (en) 1993-11-05 1993-11-05 Needle punching felt for clarification filtration

Country Status (1)

Country Link
JP (1) JP3384415B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011012881A1 (en) * 2010-09-22 2012-03-22 Krüger Gmbh & Co. Kg Portion capsule and method of making a beverage with a portion capsule
JP6614919B2 (en) * 2015-10-30 2019-12-04 タイガースポリマー株式会社 Method for producing nonwoven filter material
CN105999855A (en) * 2016-07-11 2016-10-12 欧阳业东 Glue-free composite activated carbon filtration material and preparation method thereof
CN106139738A (en) * 2016-07-11 2016-11-23 欧阳业东 A kind of base material being applied to composite filter material and preparation method thereof
CN109482886B (en) * 2019-01-07 2021-02-26 吉林大学 Preparation method of 3D printing ceramic and fiber composite reinforced aluminum-based material

Also Published As

Publication number Publication date
JPH07124427A (en) 1995-05-16

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