JP2007007566A - Biodegradable filter medium - Google Patents
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本発明は、濾材に関するものであり、さらに詳しくはクリーンルーム用エアフィルター、ビル空調用エアフィルターなどの用途として、フィルター加工性に優れ、今後ますます問題視されつつある不燃ゴミ対策、並びに酸性雨等による土壌の酸性化防止に配慮した濾材に関するものである。 The present invention relates to a filter medium, and more specifically, as an application such as an air filter for a clean room and an air filter for a building air conditioner. This is related to filter media in consideration of the prevention of soil acidification due to slag.
フィルターの環境負荷で大きな問題となっているのは使用済みのフィルターの廃棄である。ビル空調、産業空調のエアフィルターの廃棄量は年間３０００〜４０００トンといわれており、これらの使用済みフィルターは産業廃棄物として焼却処理、埋め立て処理されている。フィルターを使用しているユーザーにとって廃棄物の発生とその処理は深刻な問題であり、このためフィルターの環境対策は廃棄量の減少や環境に負荷を与えない処理法の適用に集中している。この問題を解決するために、使用後の廃棄の問題を考慮して生分解性繊維からなる不織布にて構成されるエアフィルター基材が出願されている（特許文献１参照）。
エアフィルターは、その集塵効率によって、粗塵フィルター、中性能フィルター、高性能フィルター、ＨＥＰＡフィルター、ＵＬＰＡフィルターに分類される。上記生分解性繊維からなる不織布にて構成されるエアフィルター基材は、使用する繊維の繊維径が０．５〜１００デシテックスであり、捕集効率は低く、台所用換気扇やレンジ用、空気清浄機用の粗塵フィルターに限定され、ビル空調用やクリーンルーム用の中・高性能フィルターには適さないものであった。
また、酸性雨等による土壌の酸性化防止を考慮した生分解性濾材はなかった。
Air filters are classified into coarse dust filters, medium performance filters, high performance filters, HEPA filters, and ULPA filters according to their dust collection efficiency. The air filter substrate composed of the nonwoven fabric composed of the above biodegradable fibers has a fiber diameter of 0.5 to 100 dtex, and has a low collection efficiency. It was limited to coarse filter for machine and was not suitable for medium / high performance filter for building air conditioning and clean room.
Moreover, there was no biodegradable filter medium in consideration of acidification prevention of soil due to acid rain.
本発明の課題は、ビル空調用やクリーンルーム用に使用可能であり、生分解性を有し、濾材の均一性、固体粒子の捕集効率、圧力損失といった性能をバランス良く発現し、酸性雨等による土壌の酸性化防止を考慮した生分解性濾材を提供することにある。 The problem of the present invention is that it can be used for building air conditioning and clean rooms, has biodegradability, expresses performance such as uniformity of filter media, solid particle collection efficiency, pressure loss, acid rain, etc. The purpose of the present invention is to provide a biodegradable filter medium that takes into account the prevention of soil acidification caused by aging.
本発明者らは、上記課題を解決するために鋭意検討した結果、
（１）ガラス繊維と、生分解性繊維とを主成分として含有することを特徴とする生分解性濾材、
（２）生分解性繊維の一部が再生繊維または半合成繊維であることを特徴とする請求項１に記載の生分解性濾材、
（３）ガラス繊維の繊維径が３μｍ以下であることを特徴とする請求項１または２に記載の生分解性濾材、
（４）濾材に対するガラス繊維の含有量が１〜５０質量％、濾材に対する生分解性繊維の含有量が５０〜９９質量％である請求項１〜３のいずれかに記載の生分解性濾材、
（５）濾材が湿式抄紙法で製造されることを特徴とする請求項１〜４のいずれかに記載の生分解性濾材、
を見いだした。
As a result of intensive studies to solve the above problems, the present inventors have
(1) A biodegradable filter medium comprising glass fiber and biodegradable fiber as main components,
(2) The biodegradable filter medium according to claim 1, wherein a part of the biodegradable fiber is a regenerated fiber or a semi-synthetic fiber.
(3) The biodegradable filter medium according to claim 1 or 2, wherein the fiber diameter of the glass fiber is 3 µm or less.
(4) The biodegradable filter medium according to any one of claims 1 to 3, wherein the glass fiber content relative to the filter medium is 1 to 50 mass%, and the biodegradable fiber content relative to the filter medium is 50 to 99 mass%.
(5) The biodegradable filter medium according to any one of claims 1 to 4, wherein the filter medium is produced by a wet papermaking method,
I found.
本発明者らは、ガラス繊維が酸性溶液に晒された時に徐々にリーチングされることに着目し、酸性雨により酸性域となった土壌のｐＨを中性領域に近づける作用を活用し、土壌の酸性化を防止出来ると共に、良好な生分解性を有する濾材を見いだした。すなわち、ガラス繊維は鉱物原料で無害であるばかりでなく、大気中の二酸化炭素・亜硫酸ガス・窒素酸化物などの酸化物を取り込んだ酸性雨を中和しようとしてガラス繊維自身のアルカリ性の成分とが中和反応をおこすことにより、土壌のｐＨを酸性から中性に近づける役割を果たす。使用後に埋め立てられた生分解性濾材は、土中のバクテリアによって分解される。土壌のｐＨが中性域付近である場合、バクテリアの代謝活動が活発であり、生分解性濾材は容易に分解される。一方、酸性雨に晒されて土壌のｐＨが酸性域に傾いた場合、バクテリアは、酸性下ではその代謝活動が弱いため、有機物の分解が抑制され、生分解性が阻害される。本発明の生分解性濾材は、土中のｐＨを中性に近づけることによりバクテリアの代謝活動を活性化させる事が出来る。
また、ガラス繊維、特に繊維径３μｍ以下のマイクロガラス繊維は、圧力損失が低く、高い捕集効率が得られる事からエアフィルター用濾材、液体濾過用フィルター濾材に好適に使用され、生分解性繊維と最適に配合する事により、濾材の均一性、固体粒子の捕捉能、圧力損失といった性能をバランス良く発現し、強度の高い濾材と成りうる。また、再生繊維または半合成繊維を配合することにより濾材製造時の湿式抄紙性が高まり、ビル空調用やクリーンルームの中性能エアフィルター用として好適である。また、濾材に配合される生分解性繊維は、使用後のコンポスト処理や埋めたてにより最終的には炭酸ガスと水まで分解できる。
The present inventors pay attention to the fact that glass fibers are gradually leached when exposed to an acidic solution, utilizing the effect of bringing the pH of the soil that has become acidic due to acid rain closer to the neutral region, The present inventors have found a filter medium that can prevent acidification and has good biodegradability. In other words, glass fiber is not only harmless with mineral raw materials, but also has an alkaline component of glass fiber itself in an attempt to neutralize acid rain incorporating oxides such as carbon dioxide, sulfite gas, and nitrogen oxides in the atmosphere. By performing a neutralization reaction, it plays the role of bringing the pH of the soil closer to neutral from acidic. Biodegradable filter media landed after use is decomposed by bacteria in the soil. When the pH of the soil is near the neutral range, the bacterial metabolic activity is active, and the biodegradable filter medium is easily degraded. On the other hand, when the soil is exposed to acid rain and the pH of the soil is inclined to the acidic range, bacteria are weakly metabolized under acidity, so that decomposition of organic substances is suppressed and biodegradability is inhibited. The biodegradable filter medium of the present invention can activate bacterial metabolic activity by bringing the pH in the soil close to neutral.
In addition, glass fibers, particularly micro glass fibers having a fiber diameter of 3 μm or less, are suitable for air filter media and liquid filter media because of their low pressure loss and high collection efficiency. When optimally blended, performance such as uniformity of filter media, ability to trap solid particles, and pressure loss can be expressed in a well-balanced manner, and a high-strength filter media can be obtained. In addition, blending recycled fiber or semi-synthetic fiber improves wet papermaking properties during the production of filter media, and is suitable for use in building air conditioning and medium-performance air filters in clean rooms. In addition, the biodegradable fiber blended in the filter medium can be finally decomposed into carbon dioxide and water by composting after use or fresh filling.
以下、本発明を詳説する。本発明においてガラス繊維とは、ＳｉＯ2を主体としてＡｌ2Ｏ3、Ｎａ2Ｏ、ＣａＯ、Ｋ2Ｏ、Ｂ2Ｏ3等を含むものである。これら組成に関して特に制限はないが、クリーンルーム等に使用する場合、Ｂ2Ｏ3を極力少なくしたり、もしくはなくする事が好ましい。また、埋め立て後に樹木を植樹することを考慮すると、酸性雨で溶出し樹木の害となるＡｌ3+を含むＡｌ2Ｏ3を極力少なくしたり、もしくはなくす事が好ましい。ガラス繊維の繊維径は、濾材の捕集効率を高める働きをする事から細い事が重要であり、通常２０μｍ以下であり、好ましくは３μｍ以下、より好ましくは１μｍ以下である。 The present invention is described in detail below. The glass fiber in the present invention is intended to include SiO 2 mainly Al 2 O 3, Na 2 O , CaO, K 2 O, a B 2 O 3 and the like. There is no particular limitation with respect to these compositions, but when used in a clean room or the like, or minimize a B 2 O 3, or it is preferable to eliminate. In consideration of planting trees after reclamation, it is preferable to reduce or eliminate Al 2 O 3 containing Al 3+ that is eluted by acid rain and harms trees. The fiber diameter of the glass fiber is important because it functions to increase the collection efficiency of the filter medium, and is usually 20 μm or less, preferably 3 μm or less, more preferably 1 μm or less.
本発明の濾材において、ガラス繊維のみで構成する事は生分解性の観点から好ましくなく、１種以上の生分解性繊維を併用することにより均一なネットワークを形成して、圧力損失を低く抑え、均一性を高める事により捕集効率を高めることが出来る。さらに生分解性繊維として、再生繊維または半合成繊維を使用することにより、湿式抄紙機で製造する際に湿紙状態での保水率が高まり、フェルトからの剥離性が向上する。 In the filter medium of the present invention, comprising only glass fibers is not preferable from the viewpoint of biodegradability, forming a uniform network by using one or more types of biodegradable fibers in combination, keeping pressure loss low, The collection efficiency can be increased by increasing the uniformity. Further, by using regenerated fibers or semi-synthetic fibers as biodegradable fibers, the water retention rate in the wet paper state is increased and the releasability from the felt is improved when manufacturing with a wet paper machine.
本発明の濾材において、ガラス繊維の配合比率は特に限定しないが、濾材に対する含有量が、１〜５０質量％、好ましくは、１〜３０質量％である。ガラス繊維の配合比率が５０質量％を超えた場合、埋め立て後の生分解性成分が少なくなるばかりでなく、捕集効率は十分得られるものの圧力損失、通気抵抗、通液抵抗が高くなりすぎる場合があり、濾材の寿命が短くなる傾向がある。一方、１質量％未満では、満足な捕集効率が得られない。 In the filter medium of the present invention, the mixing ratio of the glass fibers is not particularly limited, but the content with respect to the filter medium is 1 to 50% by mass, preferably 1 to 30% by mass. When the mixing ratio of the glass fiber exceeds 50% by mass, not only the biodegradable components after landfill are reduced, but also the collection efficiency is sufficient, but the pressure loss, ventilation resistance, and liquid resistance are too high. There is a tendency that the life of the filter medium is shortened. On the other hand, if it is less than 1% by mass, satisfactory collection efficiency cannot be obtained.
本発明の生分解性濾材（以下濾材と称す）において、生分解性繊維とは、生分解性能を有するものであれば特に限定されるものではないが、ポリ乳酸系樹脂、ポリブチレンサクシネート樹脂、ポリカプロラクトン樹脂、ポリエチレンサクシネート樹脂、ポリグリコール酸樹脂、ポリブチレンテレフタレート系樹脂、ポリヒドロキシブチレート系樹脂等の脂肪族ポリエステルからなる繊維が好適に使用できる。脂肪族ポリエステルとしては、ポリグリコール酸やポリ乳酸のようなポリ（α−ヒドロキシ酸）、またはこれらを主たる繰り返し単位とする共重合体が挙げられる。また、ポリ（ε−カプロラクトン）、ポリ（β−プロピオラクトン）のようなポリ（ω−ヒドロキシアルカノエート）や、ポリ−３−ヒドロキシプロピオネート、ポリ−３−ヒドロキシブチレート、ポリ−３−ヒドロキシカプロネート、ポリ−３−ヒドロキシヘプタノエート、ポリ−３−ヒドロキシオクタノエートのようなポリ（β−ヒドロキシアルカノエート）や、これらの繰り返し単位とポリ−３−ヒドロキシバリレートまたはポリ−４−ヒドロキシブチレートの繰り返し単位との共重合体などが挙げられる。 In the biodegradable filter medium of the present invention (hereinafter referred to as filter medium), the biodegradable fiber is not particularly limited as long as it has biodegradability, but it is a polylactic acid resin or polybutylene succinate resin. Fibers made of aliphatic polyester such as polycaprolactone resin, polyethylene succinate resin, polyglycolic acid resin, polybutylene terephthalate resin, polyhydroxybutyrate resin can be suitably used. Examples of the aliphatic polyester include poly (α-hydroxy acid) such as polyglycolic acid and polylactic acid, and copolymers having these as main repeating units. Further, poly (ω-hydroxyalkanoate) such as poly (ε-caprolactone) and poly (β-propiolactone), poly-3-hydroxypropionate, poly-3-hydroxybutyrate, poly-3 -Poly (β-hydroxyalkanoates) such as hydroxycapronate, poly-3-hydroxyheptanoate, poly-3-hydroxyoctanoate, and their repeating units and poly-3-hydroxyvalerate or poly And a copolymer with a repeating unit of -4-hydroxybutyrate.
また、グリコールとジカルボン酸の縮重合体からなるポリアルキレンアルカノエートの例として、ポリエチレンオキサレート、ポリエチレンサクシネート、ポリエチレンアジペート、ポリエチレンアゼレート、ポリブチレンオキサレート、ポリブチレンサクシネート、ポリブチレンアジペート、ポリブチレンセバケート、ポリヘキサメチレンセバケート、ポリネオペンチルオキサレートまたはこれらを主繰り返し単位とするポリアルキレンアルカノエート共重合体が挙げられる。 Examples of polyalkylene alkanoates comprising a condensation polymer of glycol and dicarboxylic acid include polyethylene oxalate, polyethylene succinate, polyethylene adipate, polyethylene azelate, polybutylene oxalate, polybutylene succinate, polybutylene adipate, poly Examples include butylene sebacate, polyhexamethylene sebacate, polyneopentyl oxalate, or a polyalkylene alkanoate copolymer having these as main repeating units.
これらの中でもポリ乳酸系重合体は、機械的特性や剛性に優れるだけでなく難燃性をも有するものである。具体的には、４５°ミクロバーナ法による区分３程度の難燃性を有するため、リン系難燃剤を使用することなくエアフィルター基材にリン系難燃剤が配合された従来品と同等の難燃性を付与できる。 Among these, the polylactic acid-based polymer has not only excellent mechanical properties and rigidity but also flame retardancy. Specifically, since it has a flame resistance of about Category 3 by the 45 ° micro burner method, it is as difficult as a conventional product in which a phosphorus flame retardant is blended in an air filter base material without using a phosphorus flame retardant. Can impart flammability.
また、ポリ乳酸系重合体は、芳香族ポリエステル繊維に比べて発熱量が低いため焼却炉を傷める恐れが少なく、また、有害ガスを発生することもないため、埋め立て処理だけでなく焼却処理も好適に行える。さらに、ポリ乳酸系重合体は、他の脂肪族ポリエステルと比較して剛性が高く、使用時の変形量を少なくできるためより好ましい。 In addition, polylactic acid-based polymers have a lower calorific value than aromatic polyester fibers, so there is little risk of damaging the incinerator, and no harmful gas is generated, so not only landfilling but also incineration is suitable. Can be done. Furthermore, a polylactic acid polymer is more preferable because it has higher rigidity than other aliphatic polyesters and can reduce the amount of deformation during use.
ポリ乳酸系重合体としては、ポリ（Ｄ−乳酸）、ポリ（Ｌ−乳酸）、Ｄ−乳酸とＬ−乳酸との共重合体、Ｄ−乳酸とヒドロキシカルボン酸との共重合体、Ｌ−乳酸とヒドロキシカルボン酸との共重合体、Ｄ−乳酸とＬ−乳酸とヒドロキシカルボン酸との共重合体とから選ばれるいずれかの重合体、あるいはこれらのブレンド体が挙げられる。ポリ乳酸のホモポリマーであるポリ（Ｌ−乳酸）やポリ（Ｄ−乳酸）の融点は約１８０℃であるが、ポリ乳酸系重合体として前記コポリマーを用いる場合には、実用性と融点等を考慮してポリマー成分の共重合量比を決定することが好ましく、Ｌ−乳酸とＤ−乳酸との共重合比が、モル比で、（Ｌ−乳酸）／（Ｄ−乳酸）＝１００／０〜９０／１０、あるいは（Ｌ−乳酸）／（Ｄ−乳酸）＝１０／９０〜１００／０であることが好ましい。 Examples of the polylactic acid-based polymer include poly (D-lactic acid), poly (L-lactic acid), a copolymer of D-lactic acid and L-lactic acid, a copolymer of D-lactic acid and hydroxycarboxylic acid, L- Examples thereof include a copolymer of lactic acid and hydroxycarboxylic acid, any polymer selected from a copolymer of D-lactic acid, L-lactic acid, and hydroxycarboxylic acid, or a blend thereof. Poly (L-lactic acid) and poly (D-lactic acid), which are homopolymers of polylactic acid, have a melting point of about 180 ° C. However, when the copolymer is used as a polylactic acid polymer, practicality and melting point are It is preferable to determine the copolymerization amount ratio of the polymer component in consideration of the copolymerization ratio of L-lactic acid and D-lactic acid in terms of molar ratio (L-lactic acid) / (D-lactic acid) = 100/0. It is preferable that it is -90/10 or (L-lactic acid) / (D-lactic acid) = 10 / 90-100 / 0.
乳酸とヒドロキシカルボン酸との共重合体である場合におけるヒドロキシカルボン酸としては、グリコール酸、ヒドロキシ酪酸、ヒドロキシ吉草酸、ヒドロキシペンタン酸、ヒドロキシカプロン酸、ヒドロキシヘプタン酸、ヒドロキシオクタン酸等が挙げられ、中でも特に、ヒドロキシカプロン酸またはグリコール酸を用いることが生分解性および低コストの点から好ましい。 Examples of the hydroxycarboxylic acid in the case of a copolymer of lactic acid and hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxypentanoic acid, hydroxycaproic acid, hydroxyheptanoic acid, hydroxyoctanoic acid, and the like. Of these, hydroxycaproic acid or glycolic acid is particularly preferred from the viewpoint of biodegradability and low cost.
具体的には、ポリ乳酸からなる生分解性繊維（ラクトロン カネボウ社製）、ポリヒドロキシブチレートとバリレートの共重合体組成からなる生分解性繊維（バイオポール 米国モンサント社製）、ポリカプロラクトンからなる生分解性繊維（セルグリーン ダイセル化学工業社製）、脂肪族ポリエステルからなる生分解性繊維（ビオノーレ 昭和高分子社製）、でんぷんと変性ポリビニルアルコール組成からなる生分解性繊維（マタービー イタリア国ノバモント社製）等が挙げられる。また、これら生分解性繊維は１種類の使用に限られず、それぞれ分解挙動に特徴を持った生分解性繊維を２種類以上混合して用いてもよい。 Specifically, biodegradable fiber made of polylactic acid (Lactron Kanebo Co., Ltd.), biodegradable fiber made of a copolymer composition of polyhydroxybutyrate and valerate (Biopol USA Monsanto Co., Ltd.), and polycaprolactone Biodegradable fiber (manufactured by Cellgreen Daicel Chemical Industries), biodegradable fiber composed of aliphatic polyester (manufactured by Bionore Showa Polymer Co., Ltd.), biodegradable fiber composed of starch and modified polyvinyl alcohol composition (Matterby Novamont, Italy) Manufactured) and the like. In addition, these biodegradable fibers are not limited to one type of use, and two or more types of biodegradable fibers each having a characteristic in degradation behavior may be mixed and used.
本発明において生分解性繊維として、再生繊維または半合成繊維が含まれる。具体的には、生分解性を有するレーヨン繊維、リヨセル繊維、キュプラ、アセテート等が挙げられる。その繊維径は、特に限定されないが３０μｍ以下が好ましく、より好ましくは２０μｍ以下である。好ましくは、再生繊維または半合成繊維が繊維径の異なる２種類以上の繊維等を含んだ場合、ネットワークにさらなる空間が生まれ通気性、通液性が向上する。 In the present invention, the biodegradable fiber includes regenerated fiber or semi-synthetic fiber. Specific examples include biodegradable rayon fiber, lyocell fiber, cupra, and acetate. The fiber diameter is not particularly limited, but is preferably 30 μm or less, more preferably 20 μm or less. Preferably, when the regenerated fiber or the semi-synthetic fiber includes two or more kinds of fibers having different fiber diameters, an additional space is created in the network, and air permeability and liquid permeability are improved.
また、繊維径１μｍ以下の生分解性を有するフィブリル化リヨセル繊維を併用することにより、更なるネットワークが確保され、捕集効率を高める事が可能となる。 Further, by using a fibrillated lyocell fiber having a biodegradability with a fiber diameter of 1 μm or less, a further network is secured and the collection efficiency can be increased.
また、併用出来るその他の繊維としては、皮膜の少ない麻パルプ、コットンリンター、リント、針葉樹パルプ、広葉樹パルプなどの木材パルプや藁パルプ、竹パルプ、ケナフパルプなどの木本類、草本類を含む。これらの繊維はフィブリル化されていても通液性、通気性を阻害しない範囲であればなんら差し支えない。さらに、古紙、損紙などから得られるパルプ繊維等も含まれる。 Other fibers that can be used in combination include hemp pulp, cotton linter, lint, softwood pulp, hardwood pulp, and other wood pulp, straw pulp, bamboo pulp, kenaf pulp, and other herbs. Even if these fibers are fibrillated, there is no problem as long as they do not impair liquid permeability and air permeability. Furthermore, pulp fibers obtained from waste paper, waste paper, and the like are also included.
本発明の濾材において、生分解性繊維は、生分解性熱融着繊維であっても良い。生分解性熱融着繊維を含有させて、該熱融着繊維の溶融温度以上に濾材の温度を上げる工程を濾材の製造工程に組み入れることで、濾材の機械的強度が向上する。例えば、濾材を湿式抄造法で製造し、その後の乾燥工程で、該熱融着繊維を溶融させることができる。 In the filter medium of the present invention, the biodegradable fiber may be a biodegradable heat-sealing fiber. By incorporating the biodegradable heat-fusible fiber and increasing the temperature of the filter medium above the melting temperature of the heat-fusible fiber, the mechanical strength of the filter medium is improved. For example, a filter medium can be produced by a wet papermaking method, and the heat-sealing fiber can be melted in a subsequent drying step.
本発明の濾材に係わる生分解性熱融着繊維としては、単繊維のほか、芯鞘繊維（コアシェルタイプ）、並列繊維（サイドバイサイドタイプ）、放射状分割繊維などの複合繊維が挙げられる。複合繊維は、皮膜を形成しにくいので、濾材の空間を保持したまま、機械的強度を向上させることができる。 Examples of the biodegradable heat-fusible fiber related to the filter medium of the present invention include single fibers, and composite fibers such as core-sheath fibers (core-shell type), parallel fibers (side-by-side type), and radially divided fibers. Since the composite fiber hardly forms a film, the mechanical strength can be improved while maintaining the space of the filter medium.
本発明の濾材において、生分解性熱融着繊維の繊維径は特に限定されないが、３〜３０μｍであることが好ましく、より好ましくは５〜２０μｍである。 In the filter medium of the present invention, the fiber diameter of the biodegradable heat-fusible fiber is not particularly limited, but is preferably 3 to 30 μm, more preferably 5 to 20 μm.
本発明の濾材の坪量は特に限定しないが、フィルターに加工する際の強度や必要濾材面積を考慮すると、１０〜１５０ｇ／ｍ2が好ましく、より好ましくは、５０〜１００ｇ／ｍ2である。 Although the basic weight of the filter medium of the present invention is not particularly limited, it is preferably 10 to 150 g / m 2 , more preferably 50 to 100 g / m 2 in consideration of the strength when processing into a filter and the required filter medium area.
本発明の濾材は、単層構造に限定されず、粗密構造の２層以上で構成されても良い。２層以上の構造にする場合には、密層を湿式抄紙法で作製し、粗層を一般的な乾式不織布の製法で作製した後にそれらを一体化させることも可能であり、粗層と密層とを湿式抄紙法で作製しても良い。２層以上の構成の場合で、用途がエアフィルター用の濾材の場合、上流側が粗層になる様に使用する事により寿命の長い濾材となる。一方、液体濾過用フィルターに使用する場合、密層を上流側にして使用した方が寿命が長い場合がある。 The filter medium of the present invention is not limited to a single layer structure, and may be composed of two or more layers having a dense structure. In the case of a structure having two or more layers, it is possible to produce a dense layer by a wet papermaking method and to integrate the coarse layer after producing it by a general dry nonwoven fabric manufacturing method. The layer may be produced by a wet papermaking method. In the case of two or more layers, when the application is a filter medium for an air filter, a filter medium with a long life is obtained by using the filter medium so that the upstream side is a coarse layer. On the other hand, when it is used for a filter for liquid filtration, the life may be longer when the dense layer is used on the upstream side.
本発明の濾材には、必要に応じて濾材の特性を阻害しない範囲で、バインダー、架橋剤、撥水剤、分散剤、歩留り向上剤、紙力剤、染料などの添加剤を適宜配合することができる。その場合、生分解性であることが好ましい。 In the filter medium of the present invention, additives such as a binder, a cross-linking agent, a water repellent, a dispersant, a yield improver, a paper strength agent, and a dye are appropriately blended as necessary as long as the characteristics of the filter medium are not impaired. Can do. In that case, it is preferably biodegradable.
本発明の濾材は、一般紙や湿式不織布を製造するための抄紙機、例えば、長網抄紙機、円網抄紙機、傾斜ワイヤー式抄紙機が単独、またはこれらの抄紙機が同種または異種の２機以上がオンラインで設置されているコンビネーション抄紙機などにより製造される。抄紙機で製造された湿紙は、ドライヤーで乾燥させる。乾燥させた後、熱可塑性樹脂を含有させ、エアードライヤー、シリンダードライヤー、サクションドラム式ドライヤー、赤外方式ドライヤー等で乾燥する。熱可塑性樹脂は、生分解性であることが好ましい。 The filter medium of the present invention is a paper machine for producing general paper or wet nonwoven fabric, for example, a long net paper machine, a circular net paper machine, or an inclined wire type paper machine, or these paper machines are the same or different. Manufactured on a combination paper machine installed on-line or more. The wet paper produced by the paper machine is dried with a dryer. After drying, a thermoplastic resin is contained and dried with an air dryer, a cylinder dryer, a suction drum dryer, an infrared dryer or the like. The thermoplastic resin is preferably biodegradable.
以下、本発明を実施例を挙げて本発明を具体的に説明するが、本発明は本実施例に限定されるものではない。 EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the examples.
ガラス繊維（Ｂ−２６−Ｒ、繊維径約２．６μｍ、ラウシャ製）を２質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を４８質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例１の濾材を作製した。 2% by mass of glass fiber (B-26-R, fiber diameter of about 2.6 μm, manufactured by Lauscha), 48% by mass of rayon fiber (fiber diameter of about 8 μm, fiber length of 5 mm manufactured by Daiwabo Rayon Co., Ltd.), biodegradable heat Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a fusion fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-) 50 core-sheath-type heat-sealing short fibers having a fiber diameter of about 15 μm and a fiber length of 5 mm, which are combined in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Dispersed in water at a ratio of mass% and collected a dispersion liquid having a dry weight of 60 g / m 2 , paper-making using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. Thus, the filter medium of Example 1 was produced.
ガラス繊維（Ｂ−０６−Ｆ、繊維径約０．６μｍ、ラウシャ製）を５質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を４５質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例２の濾材を作製した。 5% by mass of glass fiber (B-06-F, fiber diameter of about 0.6 μm, manufactured by Lauscha), 45% by mass of rayon fiber (fiber diameter of about 8 μm, fiber length of 5 mm, manufactured by Daiwabo Rayon), biodegradable heat Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a fusion fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-) 50 core-sheath-type heat-sealing short fibers having a fiber diameter of about 15 μm and a fiber length of 5 mm, which are combined in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Dispersed in water at a ratio of mass% and collected a dispersion liquid having a dry weight of 60 g / m 2 , paper-making using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. Thus, a filter medium of Example 2 was produced.
ガラス繊維（Ｂ−１０−Ｆ、繊維径約１．０μｍ、ラウシャ製）を２０質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を３０質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例３の濾材を作製した。 20% by mass of glass fiber (B-10-F, fiber diameter: about 1.0 μm, manufactured by Lauscha), 30% by mass of rayon fiber (fiber diameter: about 8 μm, fiber length: 5 mm, manufactured by Daiwabo Rayon Co., Ltd.), biodegradable heat Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a fusion fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-) 50 core-sheath-type heat-sealing short fibers having a fiber diameter of about 15 μm and a fiber length of 5 mm, which are combined in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Dispersed in water at a ratio of mass% and collected a dispersion liquid having a dry weight of 60 g / m 2 , paper-making using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. Thus, a filter medium of Example 3 was produced.
ガラス繊維（Ｂ−１０−Ｆ、繊維径約１．０μｍ、ラウシャ製）を４０質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を１０質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例４の濾材を作製した。 40% by mass of glass fiber (B-10-F, fiber diameter: about 1.0 μm, manufactured by Lauscha), 10% by mass of rayon fiber (fiber diameter: about 8 μm, fiber length: 5 mm, manufactured by Daiwabo Rayon), biodegradable heat Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a fusion fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-) 50 core-sheath-type heat-sealing short fibers having a fiber diameter of about 15 μm and a fiber length of 5 mm, which are combined in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Dispersed in water at a ratio of mass% and collected a dispersion liquid having a dry weight of 60 g / m 2 , paper-making using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. Thus, a filter medium of Example 4 was produced.
ガラス繊維（Ｂ−１５−Ｆ、繊維径約１．５μｍ、ラウシャ製）を６０質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を１０質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を３０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例６の濾材を作製した。 60% by mass of glass fiber (B-15-F, fiber diameter: about 1.5 μm, manufactured by Lauscha), 10% by mass of rayon fiber (fiber diameter: about 8 μm, fiber length: 5 mm, manufactured by Daiwabo Rayon), biodegradable heat Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) as a fusion fiber and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D-) 30 core-sheath-type heat-sealing short fibers having a fiber diameter of about 15 μm and a fiber length of 5 mm, which are combined in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Dispersed in water at a ratio of mass% and collected a dispersion liquid having a dry weight of 60 g / m 2 , paper-making using a standard square hand-made paper machine, and then dried with a cylinder dryer having a surface temperature of 140 ° C. Thus, a filter medium of Example 6 was produced.
粗密構造の２層構造の濾材を作製するために、粗層用としてレーヨン繊維（繊維径約２５μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を質量５０％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量４０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した、別途密層用として、ガラス繊維（Ｂ−０６−Ｆ、繊維径約０．６μｍ、ラウシャ製）を２０質量％、レーヨン繊維（繊維径約８μｍ、繊維長が５ｍｍ ダイワボウレーヨン社製）を３０質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量２０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、湿紙の状態で粗層と密層を重ね合わせて、表面温度１４０℃のシリンダードライヤーで乾燥して、実施例６の粗密構造の濾材を作製した。 In order to produce a two-layer filter medium having a dense structure, a rayon fiber (fiber diameter: about 25 μm, fiber length: 5 mm, manufactured by Daiwabo Rayon Co., Ltd.) is 50% in mass for the coarse layer, and has a melting point as a biodegradable heat-fusible fiber. Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) at 170 ° C. is the core, and polylactic acid (melting molar ratio: D-lactic acid / L-lactic acid = 130 ° C.) = 130 ° C. 8/92) is a core-sheath short fiber having a fiber diameter of about 15 μm and a fiber length of 5 mm, which is combined in a core-sheath type so that the sheath part is a mass ratio of 1: 1. A dispersion liquid was collected in an amount of 40 g / m 2 and dried using a standard square hand-made paper machine. Glass fibers (B-06-F, fiber diameter) were separately used for dense layers. About 0.6 μm, 20% by mass of Rauscha, rayon fiber (fiber diameter of about 8 μm, fiber length of 5 mm) Polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) having a melting point of 170 ° C. as a biodegradable heat-fusible fiber is 30% by mass of Iwabo Rayon Co., Ltd. A fiber diameter of about 15 μm combined in a core-sheath type with a mass ratio of 1: 1 so that polylactic acid (copolymerization molar ratio: D-lactic acid / L-lactic acid = 8/92) having a melting point of 130 ° C. becomes a sheath part, A core-sheath-type heat-sealing short fiber having a fiber length of 5 mm is dispersed in water at a ratio of 50% by mass, and a dispersion liquid having a dry weight of 20 g / m 2 is collected and used with a standard square hand-made paper machine. After the paper making, the coarse layer and the dense layer were overlapped in a wet paper state and dried with a cylinder dryer having a surface temperature of 140 ° C. to prepare a filter material with a coarse and dense structure of Example 6.
（比較例１）
生分解性繊維としてポリ乳酸（融点１７０℃、共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）からなる繊維径約１１μｍ、繊維長が５ｍｍの繊維を５０質量％、生分解性熱融着繊維として融点が１７０℃であるポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）が芯部に、融点が１３０℃のポリ乳酸（共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝８／９２）が鞘部となるように質量比１：１で芯鞘型に複合された繊維径約１５μｍ、繊維長が５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、比較例１の濾材を作製した。
(Comparative Example 1)
Biodegradable fiber: polylactic acid (melting point 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) fiber diameter of about 11 μm, fiber length of 5 mm, 50% by mass, biodegradable Polylactic acid having a melting point of 170 ° C. (copolymerization molar ratio: D-lactic acid / L-lactic acid = 2/98) is used as the heat-bonding fiber, and polylactic acid having a melting point of 130 ° C. (copolymerization molar ratio: D). A core-sheath type heat-sealing short fiber having a fiber diameter of about 15 μm and a fiber length of 5 mm, which is composited in a core-sheath type at a mass ratio of 1: 1 so that lactic acid / L-lactic acid = 8/92) becomes a sheath part. Disperse in water at a ratio of 50% by mass and collect a dispersion in a dry weight of 60 g / m 2 , make a paper using a standard square hand-made paper machine, and then dry with a cylinder dryer with a surface temperature of 140 ° C. Thus, a filter medium of Comparative Example 1 was produced.
（比較例２）
ガラス繊維（Ｂ−２６−Ｒ、繊維径約２．６μｍ、ラウシャ製）を２質量％、生分解性繊維としてポリ乳酸（融点１７０℃、共重合モル比：Ｄ−乳酸／Ｌ−乳酸＝２／９８）からなる繊維径約１１μｍ、繊維長が５ｍｍの繊維を４８質量％、ユニチカファイバー社製のポリエステルバインダー繊維「メルティ４０８０」繊維径約１５μｍ繊維長５ｍｍの芯鞘型熱融着短繊維を５０質量％の比率で水に分散し、乾燥重量６０ｇ／ｍ2になる量の分散液を採取し、標準角形手抄き抄紙機を用いて抄紙した後、表面温度１４０℃のシリンダードライヤーで乾燥して、比較例２の濾材を作製した。
(Comparative Example 2)
2% by mass of glass fiber (B-26-R, fiber diameter: 2.6 μm, manufactured by Lauscha), polylactic acid (melting point: 170 ° C., copolymerization molar ratio: D-lactic acid / L-lactic acid = 2) as biodegradable fiber / 98) a fiber having a fiber diameter of about 11 μm, a fiber length of 5 mm, 48% by mass, a polyester binder fiber “Melty 4080” manufactured by Unitika Fiber Co., Ltd., and a core-sheath type heat-sealing short fiber having a fiber diameter of about 15 μm and a fiber length of 5 mm. Disperse in water at a ratio of 50% by mass and collect a dispersion in a dry weight of 60 g / m 2 , make a paper using a standard square hand-made paper machine, and then dry with a cylinder dryer with a surface temperature of 140 ° C. Thus, a filter medium of Comparative Example 2 was produced.
＜濾材の評価＞
上記実施例１〜３及び比較例１〜２で作製した濾材について、坪量、圧力損失、粒子捕集効率、引張強度、生分解性、プリーツ加工性を以下の方法で評価した（表１）。
<Evaluation of filter media>
About the filter medium produced in the said Examples 1-3 and Comparative Examples 1-2, basic weight, pressure loss, particle collection efficiency, tensile strength, biodegradability, and pleat workability were evaluated by the following methods (Table 1). .
＜圧力損失（単位：Ｐａ）＞
ＪＩＳ Ｂ９９０８に準じて、面風速５．３ｃｍ／秒の条件で測定した。
<Pressure loss (unit: Pa)>
According to JIS B9908, it measured on the conditions of the surface wind speed of 5.3 cm / sec.
＜粒子捕集効率（単位：％）＞
ＪＩＳ Ｂ９９０８に準じて面風速５．３ｃｍ／秒の条件で測定した。測定対象粒子は、大気塵を使用して、粒子径０．３〜０．５μｍの粒子についての捕集効率をパーティクルカウンター（商品名「ＫＣ−１１」、リオン社製）を使用して測定した。
捕集効率が１５％以上であれば、ビル空調用エアフィルターやクリーンルーム用中・高性能エアフィルターに使用可能となる。
<Particle collection efficiency (unit:%)>
The surface wind speed was measured at 5.3 cm / sec in accordance with JIS B9908. The particles to be measured were measured using a particle counter (trade name “KC-11”, manufactured by Rion Co., Ltd.) for the collection efficiency of particles having a particle diameter of 0.3 to 0.5 μm using atmospheric dust. .
If the collection efficiency is 15% or more, it can be used for air filters for building air conditioning and medium / high performance air filters for clean rooms.
＜引張強度（単位：ｋＮ／ｍ）＞
ＪＩＳ Ｐ８１１３に則り、濾材を幅１５ｍｍ、長さ２００ｍｍに裁断し、テンシロン測定機（オリエンテック社製、ＨＴＭ−１００）を用いて、フルスケール４ｋｇで、破断時の荷重を各々１０回測定し、その平均値を示した。
<Tensile strength (unit: kN / m)>
In accordance with JIS P8113, the filter medium is cut into a width of 15 mm and a length of 200 mm, and using a Tensilon measuring machine (Orientec Co., Ltd., HTM-100), the load at break is measured 10 times with a full scale of 4 kg. The average value was shown.
＜生分解性＞
濾材を６ヶ月間土中に埋設し、その後フィルターの形状が維持されているか観察した。そして、６ヶ月経過後に原型をとどめていないか、強度維持していないものを○、ほぼそのままの形状で、ほぼ強度を維持していたものを×で表した。
<Biodegradability>
The filter medium was embedded in the soil for 6 months, and then it was observed whether the shape of the filter was maintained. Then, after 6 months, the prototype was not retained or the strength was not maintained, and the shape was maintained as it was and the strength was maintained as x.
＜土壌のｐＨ＞
濾材を６ヶ月間、茨城県つくば市の屋外の土中に埋設し、その後に濾材の真下の土壌を採取した。採取した土壌１０ｇに蒸留水を２５ｇ加えて良く撹拌し、上澄み液のｐＨを測定した。
<Soil pH>
The filter media was embedded in the soil outside Tsukuba City, Ibaraki Prefecture for 6 months, and then the soil just below the filter media was collected. 25 g of distilled water was added to 10 g of the collected soil and stirred well, and the pH of the supernatant was measured.
＜プリーツ（ひだ折り）加工性試験＞
サンプルをひだ状に加工し、加工性の良いものを○、悪いものを×で評価した。
<Pleated (folding) processability test>
Samples were processed into pleats, and those with good workability were evaluated as “good” and those with poor work as “poor”.
表１の結果より、ガラス繊維を使用した実施例１〜５の濾材は、圧力損失、捕集効率のバランスが良く、エアフィルターの濾材に適していることが分かる。実施例６の濾材は粗密の２層構造である事から、圧力損失と捕集効率のバランスが良く、粗層を上流にして使用した際の粉塵保持量が多く、ライフが長いフィルターとなった。
また、土壌のｐＨが中性領域に近づいていることにより、比較例１の濾材より生分解の進行が早かった。
From the results of Table 1, it can be seen that the filter media of Examples 1 to 5 using glass fibers have a good balance of pressure loss and collection efficiency, and are suitable as filter media for air filters. Since the filter medium of Example 6 has a dense two-layer structure, it has a good balance between pressure loss and collection efficiency, has a large amount of dust when used with the coarse layer upstream, and has a long life. .
In addition, biodegradation progressed faster than the filter medium of Comparative Example 1 because the soil pH was close to the neutral region.
比較例１の濾材はガラス繊維を使用していないため、捕集効率が極めて低く、ビル空調やクリーンルームの中性能エアフィルターには適さない。
比較例２の濾材は、生分解性ではないポリエステル繊維を使用したため、生分解性が悪かった。
Since the filter medium of Comparative Example 1 does not use glass fiber, the collection efficiency is extremely low, and it is not suitable for a medium-performance air filter for a building air conditioner or a clean room.
The filter medium of Comparative Example 2 was poor in biodegradability because it used polyester fibers that were not biodegradable.
本発明の濾材は、エアフィルター等に有効に用いる事が出来る。 The filter medium of the present invention can be effectively used for an air filter or the like.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497180A (en) * | 2017-10-10 | 2017-12-22 | 郭舒洋 | A kind of preparation method of biodegradation type High dust holding amount air filting material |
| KR102380847B1 (en) * | 2021-09-13 | 2022-04-01 | 주식회사 엔바이오니아 | Air Filter Media With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof |
| KR102380855B1 (en) * | 2021-09-13 | 2022-04-01 | 주식회사 엔바이오니아 | Support For an Air Filter With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof |
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| US10189335B2 (en) | 2015-10-01 | 2019-01-29 | Caterpillar Inc. | Filter |
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| JPH0970512A (en) * | 1995-09-05 | 1997-03-18 | Hokuetsu Paper Mills Ltd | Filter material for air filter and air filter |
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| JPS58205520A (en) * | 1982-05-27 | 1983-11-30 | Teijin Ltd | Filter medium |
| JPH0970512A (en) * | 1995-09-05 | 1997-03-18 | Hokuetsu Paper Mills Ltd | Filter material for air filter and air filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497180A (en) * | 2017-10-10 | 2017-12-22 | 郭舒洋 | A kind of preparation method of biodegradation type High dust holding amount air filting material |
| CN107497180B (en) * | 2017-10-10 | 2019-11-12 | 南京南欣医药技术研究院有限公司 | A kind of preparation method of biodegradation type High dust holding amount air filting material |
| KR102380847B1 (en) * | 2021-09-13 | 2022-04-01 | 주식회사 엔바이오니아 | Air Filter Media With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof |
| KR102380855B1 (en) * | 2021-09-13 | 2022-04-01 | 주식회사 엔바이오니아 | Support For an Air Filter With Antibiosis, Biodegradability and Water Repellency, and Manufacturing Method Thereof |
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