JP2006061830A - Air filter medium for domestic electric appliance - Google Patents

Air filter medium for domestic electric appliance Download PDF

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JP2006061830A
JP2006061830A JP2004247381A JP2004247381A JP2006061830A JP 2006061830 A JP2006061830 A JP 2006061830A JP 2004247381 A JP2004247381 A JP 2004247381A JP 2004247381 A JP2004247381 A JP 2004247381A JP 2006061830 A JP2006061830 A JP 2006061830A
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air filter
filter medium
air
collection efficiency
pressure loss
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Yuri Kawamoto
百合 川本
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Nitto Denko Corp
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Nitto Denko Corp
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<P>PROBLEM TO BE SOLVED: To provide an air filter medium with a low-pressure loss (high ventilation capacity), a high collection efficiency, and free from considerable power decrease after washing for a domestic electric appliance. <P>SOLUTION: In the air filter medium 10 for a domestic electric appliance, the pressure loss at a air blow speed of 5.3 cm/second is adjusted to be 120 Pa or lower, a collection efficiency of particles with a particle diameter of 0.3-0.5 μm is adjusted to be 95% or higher, and the structure is made to be a multilayer structure of which at least one is a polytetrafluoroethylene porous film 11. It is preferable for the polyethylene porous film 11 to laminate and unit a supporting layer 12 of a nonwoven fabric or the like. Since the PTFE porous film excellent in the pressure loss and collection efficiency is used, the air filter medium is reusable even after water washing with a scarce decrease of the power by water washing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、家電製品用エアフィルタ濾材に関する。   The present invention relates to an air filter medium for home appliances.

従来から、家庭用掃除機、家庭用空気清浄機、家庭用空調機等の家電製品には、空気清浄を目的に、エアフィルタ濾材が用いられている。前記エアフィルタ濾材は、圧力損失が低く(高通気量で)、且つ安価であることが重要視され、粒子径0.3〜0.5μm粒子の捕集効率が数十%程度の不織布や発泡体等が用いられてきた。しかしながら、近年、花粉やハウスダスト等に対するアレルギーに悩まされる人が急増傾向にあり、それに伴い一般消費者の空気清浄に対する意識も向上し、家電製品からの排気に関してもよりクリーンであることが求められるようになってきている。   2. Description of the Related Art Conventionally, air filter media have been used for household appliances such as household vacuum cleaners, household air cleaners, and home air conditioners for the purpose of air cleaning. It is important that the air filter medium has a low pressure loss (high air flow rate) and is inexpensive, and a non-woven fabric or foam having a particle size of 0.3 to 0.5 μm and a collection efficiency of about several tens of percent. The body has been used. However, in recent years, the number of people suffering from allergies to pollen, house dust, etc. has been increasing rapidly, and as a result, the general consumer's awareness of air purification has improved, and the exhaust from home appliances is also required to be cleaner. It has become like this.

そこで、近年は、高通気と高捕集効率を両立したエレクトレットフィルタが用いられるようになってきている(特許文献1参照。)。このフィルタは、帯電した不織布からなるフィルタであり、静電気力を利用して捕塵するために一般のフィルタに比べて通気と捕集効率のバランスがよい。エレクトレットフィルタにおいて、その帯電層には、通常、繊維径1〜20μm程度のポリプロピレン製メルトブロー不織布が用いられる。しかしながら、このエレクトレットフィルタは、時間の経過と共にフィルタの捕集効率が減衰し、また、捕集機構上、水洗いすると電荷が失われて捕集性能が著しく低下する問題があった。
特開昭54−53365号公報
Therefore, in recent years, electret filters that achieve both high ventilation and high collection efficiency have been used (see Patent Document 1). This filter is a filter made of a charged non-woven fabric, and has a good balance between ventilation and collection efficiency compared to a general filter because dust is collected using electrostatic force. In the electret filter, a polypropylene melt-blown nonwoven fabric having a fiber diameter of about 1 to 20 μm is usually used for the charging layer. However, this electret filter has a problem that the collection efficiency of the filter is attenuated with the passage of time, and there is a problem that the collection performance is remarkably deteriorated due to loss of electric charge when washed with water.
JP 54-53365 A

そこで、本発明の目的は、圧力損失が低く(高通気量で)、且つ捕集効率が高く、洗浄した後の性能の著しい低下がない家電製品用エアフィルタ濾材を提供することである。   Accordingly, an object of the present invention is to provide an air filter medium for home appliances that has a low pressure loss (with a high air flow rate), a high collection efficiency, and no significant deterioration in performance after washing.

前記目的を達成するために、本発明の家電製品用エアフィルタ濾材は、風速5.3cm/秒での圧力損失が120Pa(12.24mmH2O)以下であり、粒子径0.3〜0.5μm粒子の捕集効率が95%以上であり、多層構造であり、そのうちの少なくとも一層はポリテトラフルオロエチレン多孔質膜から形成されているエアフィルタ濾材である。 In order to achieve the object, the air filter medium for home appliances of the present invention has a pressure loss of 120 Pa (12.24 mmH 2 O) or less at a wind speed of 5.3 cm / sec and a particle size of 0.3 to 0.00. The collection efficiency of 5 μm particles is 95% or more and has a multilayer structure, at least one of which is an air filter medium formed from a polytetrafluoroethylene porous membrane.

本発明によれば、PTFE多孔質膜を捕集のために用いるから、圧力損失が低く、且つ捕集効率が高く、洗浄した後の性能の著しい低下がない家電製品用エアフィルタ濾材が得られる。   According to the present invention, since the PTFE porous membrane is used for collection, it is possible to obtain an air filter medium for home appliances that has low pressure loss, high collection efficiency, and no significant deterioration in performance after washing. .

以下に、本発明の家電製品用エアフィルタ濾材を詳しく説明する。   Below, the air filter medium for household appliances of this invention is demonstrated in detail.

本発明の家電製品用エアフィルタ濾材は、例えば図1および図2に示すように、多層構造であり、そのうちの少なくとも一層はPTFE多孔質膜から形成されている。   The air filter medium for home appliances of the present invention has a multilayer structure as shown in FIGS. 1 and 2, for example, and at least one of them is formed of a PTFE porous membrane.

本発明の家電製品用エアフィルタ濾材の圧力損失は、低ければ低いほどよいが、好ましくは100Pa(10.2mmH2O)以下かつ0Pa(0mmH2O)を超える範囲であり、より好ましくは80Pa(8.1mmH2O)以下かつ0Pa(0mmH2O)を超える範囲である。また、前記捕集効率は、高ければ高いほどよく、好ましくは99〜100%の範囲であり、より好ましくは99.5〜100%の範囲である。なお、圧力損失および捕集効率の測定は、後述の方法による。 Pressure loss of household appliances air filter medium of the present invention, be as low as possible; in the range preferably of greater than 100Pa (10.2mmH 2 O) or less and 0Pa (0mmH 2 O), more preferably 80 Pa ( 8.1 mmH 2 O) or less and exceeding 0 Pa (0 mmH 2 O). Moreover, the said collection efficiency is so good that it is high, Preferably it is the range of 99-100%, More preferably, it is the range of 99.5-100%. In addition, the measurement of a pressure loss and collection efficiency is based on the below-mentioned method.

また、本発明の家電製品用エアフィルタ濾材において、下記式のPF値が25以上であることが好ましい。前記PF値が25以上であれば、圧力損失と捕集効率のバランスが良いからである。前記PF値は、より好ましくは25〜100の範囲であり、さらに好ましくは、35〜80の範囲である。
PF値=[−log(透過率/100)/圧力損失]×100
透過率=100−捕集効率
Moreover, in the air filter medium for household appliances of this invention, it is preferable that PF value of a following formula is 25 or more. This is because if the PF value is 25 or more, the balance between pressure loss and collection efficiency is good. The PF value is more preferably in the range of 25 to 100, and still more preferably in the range of 35 to 80.
PF value = [− log (transmittance / 100) / pressure loss] × 100
Transmittance = 100-collection efficiency

前記PTFE多孔質膜において、その厚さは、例えば2〜100μmの範囲内であり、その平均孔径は、例えば、0.5〜5μmの範囲内であり、その空孔率は、例えば、85〜95%の範囲内である。   In the PTFE porous membrane, the thickness is, for example, in the range of 2 to 100 μm, the average pore diameter is, for example, in the range of 0.5 to 5 μm, and the porosity is, for example, 85 to It is in the range of 95%.

本発明の家電製品用エアフィルタ濾材は、多層構造の少なくとも一層が支持層であるのが好ましい。支持層の積層数や積層部材の種類等は特に制限されないが、前記で規定した圧力損失および捕集効率の範囲内で、PTFE多孔質膜の補強を目的に、支持層を積層することが好ましい。支持層があれば、強度が高くなるからである。   In the air filter medium for home appliances of the present invention, at least one of the multilayer structures is preferably a support layer. The number of support layers to be laminated and the type of laminated member are not particularly limited, but it is preferable to laminate the support layers for the purpose of reinforcing the porous PTFE membrane within the range of pressure loss and collection efficiency defined above. . This is because the strength of the support layer increases.

また、前記支持層の材質は、特に制限されず、例えば、織布、不織布、金属ないしプラスチックのメッシュ、金属ないしプラスチックのネット、プラスチック発泡体などが使用できる。特に限定するものではないが、風圧に対する強度の点から、前記支持層の単位面積当たりの重量は、好ましくは10〜200g/m2、より好ましくは30〜150g/m2、さらに好ましくは70〜150g/m2の範囲にあるのがよい。 The material of the support layer is not particularly limited, and for example, woven fabric, non-woven fabric, metal or plastic mesh, metal or plastic net, plastic foam and the like can be used. Although not particularly limited, in terms of strength against wind pressure, the weight per unit area of the support layer is preferably 10 to 200 g / m 2 , more preferably 30 to 150 g / m 2 , and still more preferably 70 to It should be in the range of 150 g / m 2 .

本発明のエアフィルタ濾材の曲げ剛性は、取り扱い性を考慮すると、例えば0.001〜5gf・cm2/cm(9.8×10-6〜4.9×10-2N・cm2/cm)の範囲内であり、好ましくは0.01〜4gf・cm2/cm(9.8×10-5〜3.9×10-2N・cm2/cm)であり、より好ましくは0.1〜3gf・cm2/cm(9.8×10-4〜3.9×10-2N・cm2/cm)の範囲である。前記曲げ剛性は、例えば、測定機KES−FB2(商品名)(カトーテック株式会社製)を用いた曲げ試験において、最大曲率±2.5cm-1で測定することができる。 The bending rigidity of the air filter medium of the present invention is, for example, 0.001 to 5 gf · cm 2 / cm (9.8 × 10 −6 to 4.9 × 10 −2 N · cm 2 / cm in consideration of handleability. ), Preferably 0.01 to 4 gf · cm 2 / cm (9.8 × 10 −5 to 3.9 × 10 −2 N · cm 2 / cm), more preferably 0.8. It is in the range of 1 to 3 gf · cm 2 / cm (9.8 × 10 −4 to 3.9 × 10 −2 N · cm 2 / cm). The bending rigidity can be measured with a maximum curvature of ± 2.5 cm −1 in a bending test using, for example, a measuring machine KES-FB2 (trade name) (manufactured by Kato Tech Co., Ltd.).

前記PTFE多孔質膜と支持層は、接着して一体化されることが好ましい。その接着方法は、特に制限されないが、両者の通気性を維持するため接着面積を少なくすることが好ましい。前記接着方法としては、例えば、熱溶融性のネットないしメッシュを間に挟んでラミネートする方法、微細な点状ないし線状に接着剤を塗布し接着する方法等が挙げられる。接着剤としては、2液混合型や熱による自己架橋型の接着剤などを用いることができる。2液混合型としてはエポキシ樹脂、熱による自己架橋型としては酢酸ビニル−エチレン共重合体やエチレン−塩化ビニル共重合体等が好適である。   The porous PTFE membrane and the support layer are preferably bonded and integrated. The bonding method is not particularly limited, but it is preferable to reduce the bonding area in order to maintain the air permeability of both. Examples of the bonding method include a method of laminating with a heat-meltable net or mesh sandwiched therebetween, a method of applying and bonding an adhesive in fine dots or lines. As the adhesive, a two-component mixed type or a self-crosslinking type adhesive by heat can be used. As the two-component mixed type, an epoxy resin is suitable, and as the self-crosslinking type by heat, a vinyl acetate-ethylene copolymer or an ethylene-vinyl chloride copolymer is suitable.

コスト的見地から、前記接着方法としては、予め熱接着性をもった不織布をPTFE多孔質膜にラミネートする方法が好ましい。例えば、素材の一部ないし全部が、ポリエチレンのような熱可塑性樹脂でできている不織布を、PTFE多孔質膜と適切な熱、圧力でラミネートすると、繊維の一部が溶融してPTFE多孔質膜と接着する。この接着は、不織布の繊維上に限定されるため、繊維のない部分では通気性が確保される。   From the viewpoint of cost, the bonding method is preferably a method of laminating a non-woven fabric having thermal adhesion in advance to the porous PTFE membrane. For example, when a non-woven fabric made of a thermoplastic resin such as polyethylene is partially or entirely laminated with a PTFE porous membrane with appropriate heat and pressure, a part of the fiber melts and the PTFE porous membrane Adhere with. Since this adhesion is limited to the non-woven fiber, air permeability is ensured in the part without fiber.

つぎに、本発明の家電製品用エアフィルタ濾材の積層形態は、PTFE多孔質膜を少なくとも一層は含む以外は特に制限されない。例えば、図1に示すように、PTFE多孔質膜11と支持層12とが一層ずつ積層されており、PTFE多孔質膜11が表面に露出したタイプのエアフィルタ濾材10でもよいし、図2に示すように、2つの支持層22で、PTFE多孔質膜21をサンドイッチした形態のエアフィルタ濾材20であってもよい。なお、前記両図において、矢印は空気の流れる方向を示す。   Next, the lamination | stacking form of the air filter medium for household appliances of this invention is not restrict | limited especially except including a PTFE porous membrane at least one layer. For example, as shown in FIG. 1, the PTFE porous membrane 11 and the support layer 12 are laminated one by one, and the air filter medium 10 in which the PTFE porous membrane 11 is exposed on the surface may be used. As shown, the air filter medium 20 may have a form in which a PTFE porous membrane 21 is sandwiched between two support layers 22. In both figures, the arrow indicates the direction of air flow.

本発明の家電製品用エアフィルタ濾材は、その一部または全部に抗菌処理が施されているのが好ましい。抗菌処理されていないエアフィルタ濾材よりも、菌、カビ等の繁殖を抑えられるからである。   The air filter medium for home appliances of the present invention is preferably subjected to antibacterial treatment on a part or all of it. This is because the growth of fungi, molds, etc. can be suppressed as compared with air filter media not subjected to antibacterial treatment.

この抗菌処理は、処理後のエアフィルタ濾材に抗菌性能が認められれば、抗菌剤の種類、処理方法、塗布量等は特に制限されず、抗菌性能、安全性、使用環境、価格等に応じて適宜選択する。抗菌剤の種類としては、例えば、無機系、有機系、天然性の抗菌剤を濾材の用途や目的に応じて、単独であるいは複合して使用することができるが、無機系抗菌剤であれば、銀イオン、銅イオン、亜鉛イオンを含有するものが、有機系であれば第4級アンモニウムイオンを含有するものが、天然系であればキトサンを含有するものが好ましい。処理方法としては、例えば、エアフィルタ濾材の構成素材の製造時に抗菌性物質を混入する方法、ディッピングによってエアフィルタ濾材全部またはエアフィルタ濾材を構成する層全部に処理を施す方法、あるいは塗布によりある面だけを処理する方法等が考えられる。エアフィルタ濾材の一部のみを処理する場合には、例えば、図1に示すように、気体の流れの上流側の面にあたるPTFE多孔質膜11の表面を処理してもよいし、気体の流れの下流側の面にあたる支持層12の表面を処理してもよいが、より雑菌等が繁殖しやすい、気体の流れの上流側の面を処理するのが好ましい。   As long as antibacterial performance is recognized in the air filter medium after the treatment, the type of antibacterial agent, treatment method, application amount, etc. are not particularly limited, depending on the antibacterial performance, safety, use environment, price, etc. Select as appropriate. As the types of antibacterial agents, for example, inorganic, organic and natural antibacterial agents can be used alone or in combination depending on the purpose and purpose of the filter medium. Those containing silver ions, copper ions and zinc ions are preferably organic compounds containing quaternary ammonium ions, and those containing natural ions are preferably containing chitosan. Examples of the treatment method include a method of mixing an antibacterial substance at the time of manufacturing the constituent material of the air filter medium, a method of treating the entire air filter medium or all the layers constituting the air filter medium by dipping, or a certain surface by coating. A method of processing only the above is conceivable. In the case of processing only a part of the air filter medium, for example, as shown in FIG. 1, the surface of the porous PTFE membrane 11 corresponding to the upstream surface of the gas flow may be processed, or the gas flow The surface of the support layer 12 corresponding to the downstream surface of the gas may be treated, but it is preferable to treat the surface on the upstream side of the gas flow where germs and the like can easily propagate.

本発明の家電製品用エアフィルタ濾材の色は、特に制限されず、必要に応じて、その一部または全部に着色処理を施してもよい。着色処理を施すことにより、エアフィルタ濾材に積層された塵埃が目立たなくなる等、外観上の利点が得られる場合があるからである。   The color of the air filter medium for home appliances of the present invention is not particularly limited, and a part or all of the color may be subjected to a coloring treatment as necessary. This is because by applying the coloring treatment, there may be an advantage in appearance such that the dust stacked on the air filter medium becomes inconspicuous.

着色方法は、特に制限されず、例えば、エアフィルタ濾材の構成素材の製造時に着色剤(染料・顔料等)を混入する方法、ディッピングによってエアフィルタ濾材全部またはエアフィルタ濾材を構成する層全部に処理を施す方法、あるいは塗布によりある面だけを処理する方法等が考えられる。着色剤の種類としては、例えば、フタロシアニン系顔料、アゾ系顔料、複合酸化物系顔料、分散染料、カチオン染料が挙げられる。エアフィルタ濾材の一部のみを処理する場合には、例えば、図1に示すように、気体の流れ(矢印)の上流側の面にあたるPTFE多孔質膜11の表面を処理してもよいし、気体の流れ(矢印)の下流側の面にあたる支持層12の表面を処理してもよい。この着色処理を施すことによって、エアフィルタ濾材に積層された塵が目立たなくなる等、外観上の利点が得られることがある。   The coloring method is not particularly limited, for example, a method of mixing a colorant (dye, pigment, etc.) at the time of manufacturing the constituent material of the air filter medium, or processing to all the air filter medium or all the layers constituting the air filter medium by dipping A method of applying a surface or a method of processing only a certain surface by coating is conceivable. Examples of the colorant include phthalocyanine pigments, azo pigments, complex oxide pigments, disperse dyes, and cationic dyes. When processing only a part of the air filter medium, for example, as shown in FIG. 1, the surface of the PTFE porous membrane 11 corresponding to the upstream surface of the gas flow (arrow) may be processed, The surface of the support layer 12 corresponding to the downstream surface of the gas flow (arrow) may be treated. By applying this coloring treatment, there are cases in which an advantage in appearance is obtained, for example, dust deposited on the air filter medium becomes inconspicuous.

また、前記抗菌処理と着色処理は、どちらか一方だけを施してもよいし、両方を施してもよい。   Further, either one or both of the antibacterial treatment and the coloring treatment may be performed.

前記PTFE多孔質膜は、市販品を使用してもよく、また、次に示す製造方法で製造してもよい。PTFE多孔質膜の製造方法の一例を以下に示す。   The PTFE porous membrane may be a commercially available product or may be manufactured by the following manufacturing method. An example of a method for producing a PTFE porous membrane is shown below.

まず、未焼成のPTFE微粉末に液状潤滑剤を加えて均一に混和する。前記PTFE微粉末としては、特に制限されず、市販のものが使用できる。前記液状潤滑剤としては、前記PTFE粉末を濡らすことができ、後に除去できるものであれば特に制限されず、例えば、ナフサ、ホワイトオイル、流動パラフィン、トルエン、キシレン等の炭化水素油や、アルコール類、ケトン類およびエステル類の溶媒等が使用できる。また、これらは、単独で使用しても良く、若しくは二種類以上併用してもよい。   First, a liquid lubricant is added to the unfired PTFE fine powder and mixed uniformly. The PTFE fine powder is not particularly limited, and a commercially available product can be used. The liquid lubricant is not particularly limited as long as it can wet the PTFE powder and can be removed later. For example, hydrocarbon oil such as naphtha, white oil, liquid paraffin, toluene, xylene, alcohols , Solvents of ketones and esters, and the like can be used. These may be used singly or in combination of two or more.

前記PTFE微粉末に対する液状潤滑剤の添加割合は、前記PTFE微粉末の種類、液状潤滑油の種類および後述するシート成形の条件等により適宜決定されるが、例えば、PTFE微粉末100重量部に対して、液状潤滑剤15〜35重量部の範囲である。   The addition ratio of the liquid lubricant to the PTFE fine powder is appropriately determined depending on the type of the PTFE fine powder, the type of the liquid lubricant, and the conditions of sheet molding described later. For example, for 100 parts by weight of the PTFE fine powder The liquid lubricant is in the range of 15 to 35 parts by weight.

つぎに、前記混和物を未焼成状態でシート状に成形する。前記成形方法としては、例えば、前記混和物をロッド状に押し出した後、対になったロールにより圧延する圧延法や、板状に押し出してシート状にする押し出し法があげられる。また、両方法を組み合わせてもよい。このシート状成形体の厚みは、後に行なう延伸の条件等により適宜決定されるが、例えば、0.1〜0.5mmの範囲である。   Next, the mixture is formed into a sheet in an unfired state. Examples of the forming method include a rolling method in which the mixture is extruded into a rod shape and then rolled with a pair of rolls, and an extrusion method in which the mixture is extruded into a plate shape to form a sheet. Moreover, you may combine both methods. Although the thickness of this sheet-like molded object is suitably determined by the conditions of the extending | stretching performed later, etc., it is the range of 0.1-0.5 mm, for example.

なお、得られたシート状成形体に含まれる前記液状潤滑剤は、続いて行なう延伸工程前に、加熱法または抽出法等により除去しておくことが好ましい。前記抽出法に使用する溶媒は、特に制限されないが、例えば、ノルマルデカン、ドデカン、ナフサ、ケロシン、スモイル、トリクレン等があげられる。   The liquid lubricant contained in the obtained sheet-like molded body is preferably removed by a heating method, an extraction method, or the like before the subsequent stretching step. The solvent used in the extraction method is not particularly limited, and examples thereof include normal decane, dodecane, naphtha, kerosene, sumoyl, trichlene and the like.

つぎに、前記シート状成形体に対して延伸を行なう。前記シート状成形体をPTFEの融点(327℃)以下の温度で、一軸延伸または二軸延伸で延伸し多孔化する。例えば、前記シート状成形体の長手方向において、温度150〜327℃で500〜4000%延伸し、続いて、前記シート状成形体の幅方向において、温度40〜250℃で1000〜8000%延伸する。前記延伸後、その延伸状態を保持して、PTFEの融点(327℃)以上の温度に加熱して焼成することにより、機械的強度の向上と寸法安定性の増加を図ることができる。なお、この焼成工程は任意である。以上のようにして、PTFE多孔質膜が製造できる。   Next, it extends | stretches with respect to the said sheet-like molded object. The sheet-like molded body is made porous by uniaxial stretching or biaxial stretching at a temperature not higher than the melting point (327 ° C.) of PTFE. For example, in the longitudinal direction of the sheet-shaped molded body, it is stretched by 500 to 4000% at a temperature of 150 to 327 ° C., and subsequently, is stretched by 1000 to 8000% at a temperature of 40 to 250 ° C. in the width direction of the sheet-shaped molded body. . After the stretching, the stretched state is maintained and heated to a temperature equal to or higher than the melting point (327 ° C.) of PTFE and baked to improve the mechanical strength and increase the dimensional stability. In addition, this baking process is arbitrary. Thus, a PTFE porous membrane can be produced.

なお、PTFE多孔質膜の製造方法は特に制限されず、前述の方法以外の方法で製造してもよい。   In addition, the manufacturing method in particular of a PTFE porous membrane is not restrict | limited, You may manufacture by methods other than the above-mentioned method.

前述のようにして製造された本発明の家電製品用エアフィルタ濾材は、家庭用掃除機、家庭用空気清浄機、家庭用空調機等、各種家電製品用のエアフィルタ濾材として用いることができ、各種家電製品に常法で取り付けられ使用される。前記エアフィルタ濾材は、洗浄しても性能の著しい低下がないため、定期的に洗浄することで繰り返し使用することができる。この洗浄は、水に浸漬して行なってもよいし、洗剤を水に溶かしたものを使用してもよい。使用する洗剤の種類は、特に制限されない。ただし、固形または粉状の石鹸を使用する場合は、エアフィルタ濾材が目詰まりを起こさぬよう、十分に溶かしてから使用するのが好ましい。また、超音波を使用して洗浄したり、柔らかいブラシ等でエアフィルタ濾材を軽くこする等してもよい。   The air filter medium for home appliances of the present invention produced as described above can be used as an air filter medium for various home appliances such as household vacuum cleaners, home air cleaners, home air conditioners, etc. It is installed and used in a variety of home appliances in the usual way. Since the air filter medium does not have a significant decrease in performance even when washed, it can be used repeatedly by washing regularly. This washing may be performed by immersing in water, or a detergent dissolved in water may be used. The type of detergent used is not particularly limited. However, when using solid or powdered soap, it is preferable to use it after sufficiently dissolving the air filter medium so as not to cause clogging. Moreover, you may wash | clean using an ultrasonic wave, or may lightly rub an air filter medium with a soft brush etc.

また、本発明の家電製品用エアフィルタ濾材は、特に電気掃除機用フィルタバックに好ましく用いることができる。本発明の家電製品用エアフィルタ濾材を含む電気掃除機用フィルタバックは、低圧力損失(高通気性)と高捕集効率を両立し、さらに、水分存在下にも捕集効率が低下しない。つまり、本発明の電気掃除機用フィルタバックは、低圧力損失であるので、掃除機性能の指標となる仕事率を大きくできる。また、本発明の電気掃除機用フィルタバックは、高捕集効率であるので、アトピー、喘息、アレルギーの原因物質であるダニの卵、分、抜け殻および死骸、花粉等を充分捕集できる。さらに、水分存在下にも捕集効率が低下しないので、本発明の電気掃除機用フィルタバックは、水分を含んだ塵を捕集したり、湿気が高い場所で使用することもできる。そこで、以下に本発明の家電製品用エアフィルタ濾材を含む電気掃除機用フィルタバックについて詳しく説明する。   Moreover, the air filter medium for household appliances of this invention can be preferably used especially for the filter back | bag for vacuum cleaners. The filter bag for a vacuum cleaner including the air filter medium for home appliances of the present invention achieves both low pressure loss (high air permeability) and high collection efficiency, and further does not lower the collection efficiency even in the presence of moisture. That is, the filter back for a vacuum cleaner of the present invention has a low pressure loss, so that the work rate that is an index of the vacuum cleaner performance can be increased. Further, the filter bag for a vacuum cleaner according to the present invention has a high collection efficiency, and therefore can sufficiently collect eggs, minutes, shells and dead bodies, pollen, and the like which are causative substances of atopy, asthma and allergy. Furthermore, since the collection efficiency does not decrease even in the presence of moisture, the vacuum cleaner filter bag of the present invention can collect moisture-containing dust or can be used in places with high humidity. Then, the filter back | bag for vacuum cleaners containing the air filter medium for household appliances of this invention is demonstrated in detail below.

本発明の電気掃除機用フィルタバックの一例を図3及び図4に示す。図3は、前記電気掃除機用フィルタバックの断面図であり、図4は、前記電気掃除機用フィルタバックの正面図である。この電気掃除機用フィルタバック30は、本発明の家電製品用エアフィルタ濾材10を袋状に形成し、その開口部分に支持板32を配置したものである。前記支持板32の長手方向の一端には、U字型の切欠32aが形成され、別の一端に孔32bが形成され、これらにより、電気掃除機用フィルタバック30が電気掃除機に容易に装着できるようになっている。このフィルタバック30において、家電製品用エアフィルタ濾材10のPTFE多孔質膜11は内面に位置しており、家電製品用エアフィルタ濾材10の支持層12は外面に位置している。   An example of the filter bag for a vacuum cleaner of the present invention is shown in FIGS. FIG. 3 is a cross-sectional view of the vacuum cleaner filter back, and FIG. 4 is a front view of the vacuum cleaner filter back. This vacuum cleaner filter back 30 is formed by forming the air filter medium 10 for home appliances of the present invention into a bag shape, and arranging a support plate 32 at the opening. A U-shaped notch 32a is formed at one end in the longitudinal direction of the support plate 32, and a hole 32b is formed at the other end, so that the vacuum cleaner filter back 30 can be easily attached to the vacuum cleaner. It can be done. In this filter bag 30, the PTFE porous membrane 11 of the air filter medium 10 for home appliances is located on the inner surface, and the support layer 12 of the air filter medium 10 for home appliances is located on the outer surface.

電気掃除機用フィルタバックに用いられる本発明の家電製品用エアフィルタ濾材においては、圧力損失が、好ましくは80Pa(8.1mmH2O)以下かつ0Pa(0mmH2O)を超える範囲であり、より好ましくは60Pa(6mmH2O)以下かつ0Pa(0mmH2O)を超える範囲である。また、前記捕集効率は、高ければ高いほどよく、好ましくは97%以上かつ100%以下、より好ましくは99%以上かつ100%以下の範囲である。なお、圧力損失および捕集効率の測定は、後述の方法による。 In household appliances air filter medium of the present invention used in the filter back vacuum cleaner, the pressure loss is in the range preferably of greater than 80Pa (8.1mmH 2 O) or less and 0Pa (0mmH 2 O), more preferably in the range of greater than 60Pa (6mmH 2 O) or less and 0Pa (0mmH 2 O). Moreover, the said collection efficiency is so high that it is high, Preferably it is 97% or more and 100% or less, More preferably, it is the range of 99% or more and 100% or less. In addition, the measurement of a pressure loss and collection efficiency is based on the below-mentioned method.

また、電気掃除機用フィルタバックに用いられる本発明の家電製品用エアフィルタ濾材においては、前記PF値が40以上であるのが好ましい。前記PF値が40以上であれば、圧力損失と捕集効率のバランスが良いからである。前記PF値は、より好ましくは50〜100の範囲であり、さらに好ましくは60〜100の範囲である。   Moreover, in the air filter medium for household appliances of this invention used for the filter back | bag for vacuum cleaners, it is preferable that the said PF value is 40 or more. This is because if the PF value is 40 or more, the balance between pressure loss and collection efficiency is good. The PF value is more preferably in the range of 50 to 100, still more preferably in the range of 60 to 100.

本発明の家電製品用エアフィルタ濾材を電気掃除機用フィルタバッグに使用する場合には、前記支持層の単位面積当たりの重量は、取り扱い性を考慮して、10〜100g/m2の範囲内であることが好ましく、15〜60g/m2の範囲内にあるのがより好ましい。また、本発明の家電製品用エアフィルタ濾材を電気掃除機用フィルタバッグに使用する場合には、本発明のエアフィルタ濾材の曲げ剛性は、取り扱い性を考慮して、0.001〜1gf・cm2/cm(9.8×10-6〜9.8×10-3N・cm2/cm)の範囲内であることが好ましい。これは例えば、電気掃除機用フィルタバックを廃棄する際に、塵を含んで膨らんだ前記フィルタバックが、前記支持層の復元力により前記フィルタバック内の塵を圧迫して、内部の塵が散乱するのを防止することができる等、取り扱いが容易になるからである。なお、前記曲げ剛性は、例えば、測定機KES−FB2(商品名)(カトーテック株式会社製)を用いた曲げ試験において、最大曲率±2.5cm-1で測定することができる。 When the air filter medium for home appliances of the present invention is used in a filter bag for a vacuum cleaner, the weight per unit area of the support layer is in the range of 10 to 100 g / m 2 in consideration of handling. It is preferable that it is in the range of 15-60 g / m < 2 >. In addition, when the air filter medium for home appliances of the present invention is used for a filter bag for a vacuum cleaner, the bending rigidity of the air filter medium of the present invention is 0.001 to 1 gf · cm in consideration of handleability. 2 /cm(9.8×10 -6 is preferably to 9.8 × the range of 10 -3 N · cm 2 / cm ). This is because, for example, when the filter bag for a vacuum cleaner is discarded, the filter bag swelled with dust presses the dust in the filter bag by the restoring force of the support layer, and the dust inside is scattered. This is because it is easy to handle, such as being able to prevent it. In addition, the said bending rigidity can be measured by the maximum curvature +/- 2.5cm < -1 > in the bending test using measuring machine KES-FB2 (brand name) (made by Kato Tech Co., Ltd.), for example.

電気掃除機用フィルタバックに用いられる場合にも、本発明のエアフィルタ濾材の厚さは、例えば2〜100μmの範囲内であり、その平均孔径は、例えば0.2〜50μmの範囲内であり、その空孔率は、85〜95%の範囲内である。   Also when used for a filter back for a vacuum cleaner, the thickness of the air filter medium of the present invention is in the range of 2 to 100 μm, for example, and the average pore diameter is in the range of 0.2 to 50 μm, for example. The porosity is in the range of 85 to 95%.

つぎに、本発明の実施例について、比較例と併せて説明する。なお、以下に示す実施例1および2の各エアフィルタ濾材は、例えば、風圧に耐えるだけの剛性が必要な用途(家庭用空気清浄機および家庭用空調機など)に使用することを目的とするものであり、いずれの実施例においても支持層としてポリエチレン/ポリエステル複合型不織布を用いて、各エアフィルタ濾材の曲げ剛性を強化したものである。また、実施例3のエアフィルタ濾材は、実施例1および2とは逆に、剛性があまり必要でない電気掃除機用フィルタバックに使用することを目的とするものである。実施例および比較例におけるPTFE多孔質膜、エアフィルタ濾材、エレクトレットフィルタ、紙製フィルタバックの濾材および不織布の各特性の測定方法は、以下に示すとおりである。   Next, examples of the present invention will be described together with comparative examples. In addition, each air filter medium of Example 1 and 2 shown below aims at using it for the use (home air cleaner, domestic air conditioner, etc.) which needs rigidity sufficient to endure wind pressure, for example. In any of the examples, a polyethylene / polyester composite nonwoven fabric is used as a support layer, and the bending rigidity of each air filter medium is reinforced. Moreover, the air filter medium of Example 3 is intended to be used for a filter back for a vacuum cleaner that does not require much rigidity, contrary to Examples 1 and 2. The measuring method of each characteristic of the PTFE porous membrane, the air filter medium, the electret filter, the filter medium of the paper filter back and the nonwoven fabric in Examples and Comparative Examples is as follows.

(1)圧力損失
圧力損失は、JIS K 0901の気体中のダスト試料捕集用ろ過材の試験方法に準じて測定した。サンプル(PTFE多孔質膜、エアフィルタ濾材またはエレクトレットフィルタ、以下同じ)に対する風速を5.3cm/秒に調製して、圧力損失(単位:PaおよびmmH2O)を圧力計(マノメーター)で測定した。なお、サンプルに対する風速を5.3cm/秒としたのは、一般に高性能エアフィルタの通気抵抗は、米軍軍事規格(MILITARY STANDARD)MF−F−51079Dに基づいて測定するので、この基準に従ったものである。
(1) Pressure loss The pressure loss was measured according to the test method for the filter material for collecting dust samples in the gas of JIS K 0901. The wind speed for the sample (PTFE porous membrane, air filter medium or electret filter, the same applies hereinafter) was adjusted to 5.3 cm / sec, and the pressure loss (unit: Pa and mmH 2 O) was measured with a pressure gauge (manometer). . Note that the wind speed for the sample was set to 5.3 cm / second because, in general, the airflow resistance of a high-performance air filter is measured based on the MIL-TRY STANDARD MF-F-51079D. It is a thing.

(2)捕集効率
捕集効率は、JIS K 3803の除菌用空気ろ過デプスフィルタのエアロゾル捕集性能試験方法により、粒子系0.3〜0.5μmのジオクチルフタレート(DOP)の粒子を用いて測定した。捕集効率は、下記(数1)による。
(2) Collection efficiency The collection efficiency was measured using particles of 0.3 to 0.5 μm dioctyl phthalate (DOP) according to the aerosol collection performance test method of the air filter depth filter for sterilization of JIS K 3803. Measured. The collection efficiency is based on the following (Equation 1).

捕集効率(%)=(1−下流側の粒子数/上流側の粒子数)×100         Collection efficiency (%) = (1−number of downstream particles / number of upstream particles) × 100

下流側の粒子数の単位:個/リットル
上流側の粒子数の単位:個/リットル
Unit of the number of particles on the downstream side: pieces / liter Unit of the number of particles on the upstream side: pieces / liter

(3)目付け量
目付け量は、ポリオレフィン系不織布を100cm2にサンプリングし、その重さを電子天秤により測定して1m2当たりの重量を求めた。
(3) Weight per unit area The amount per unit area of the polyolefin nonwoven fabric was sampled to 100 cm 2 and the weight was measured with an electronic balance to determine the weight per 1 m 2 .

(4)空孔率
空孔率は、PTFE多孔質膜の片面の面積S(cm2)、厚みd(cm)、重量m(g)および比重r(g/cm3)とから、下記の式により求めた。
(4) Porosity The porosity is calculated from the area S (cm 2 ), the thickness d (cm), the weight m (g), and the specific gravity r (g / cm 3 ) on one side of the PTFE porous membrane as follows: Obtained by the formula.

空孔率(体積%)=[1−(m/(S×d×r))]×100   Porosity (volume%) = [1- (m / (S × d × r))] × 100

(実施例1)
まず、PTFEファインパウダー100重量部に対して流動パラフィン(液状潤滑剤)を20重量部加えたペースト状の混和物を予備成形した。ついで、予備成形物をペースト押し出しにより丸棒状に成形し、この丸棒状物を圧延し、厚さ0.2mmのシート状PTFE成形体を得た。前記シート状PTFE成形体から前記液状潤滑剤をトリクレンによる抽出により除去した後、その長さが長手方向に20倍になるように、300℃で延伸を行なった。続いて、このシート状PTFE成形体を、その長さが幅方向に50倍になるように150℃で延伸して、厚さ4μm、空孔率95%のPTFE多孔質膜21を得た。得られたPTFE多孔質膜21の風速5.3cm/秒での圧力損失は49Pa(5.0mmH2O)、粒子径0.3〜0.5μm粒子の捕集効率は99.97%、PF値は70であった。
Example 1
First, a paste-like mixture in which 20 parts by weight of liquid paraffin (liquid lubricant) was added to 100 parts by weight of PTFE fine powder was preformed. Next, the preform was formed into a round bar by paste extrusion, and the round bar was rolled to obtain a sheet-like PTFE molded body having a thickness of 0.2 mm. The liquid lubricant was removed from the sheet-like PTFE molded product by extraction with trichlene, and then stretched at 300 ° C. so that the length thereof was 20 times in the longitudinal direction. Subsequently, this sheet-like PTFE molded body was stretched at 150 ° C. so that the length thereof was 50 times in the width direction to obtain a PTFE porous membrane 21 having a thickness of 4 μm and a porosity of 95%. The obtained PTFE porous membrane 21 has a pressure loss of 49 Pa (5.0 mmH 2 O) at a wind speed of 5.3 cm / sec, a collection efficiency of 99.97% for particles having a particle size of 0.3 to 0.5 μm, PF The value was 70.

次に、それぞれ目付け量70g/m2および30g/m2のポリエチレン/ポリエステル複合型不織布を用意し、表面に顔料(フタロシアニンブルー)と抗菌剤(銀系抗菌剤)とを混入したコーティング液を塗布した後、風乾して、抗菌・着色処理を施した。ついで、前記PTFE多孔質膜の上流側および下流側に、支持層として、前記ポリエチレン/ポリエステル複合型不織布を重ねた後、熱ラミネートにより一体化して、図2に示す構造の家電製品用エアフィルタ濾材20を作製した。この家電製品用エアフィルタ濾材20の風速5.3cm/秒での圧力損失は73.5Pa(7.5mmH2O)であり、粒子径0.3〜0.5μm粒子対象の捕集効率は99.98%、PF値は49であった。 Next, each providing a polyethylene / polyester composite nonwoven basis weight 70 g / m 2 and 30 g / m 2, the surface of the pigment (phthalocyanine blue) and antimicrobial agent (silver antibacterial agent) contaminating the coating liquid and coating Then, it was air-dried and subjected to antibacterial / coloring treatment. Subsequently, the polyethylene / polyester composite nonwoven fabric is laminated as a support layer on the upstream side and downstream side of the PTFE porous membrane, and then integrated by thermal lamination, and the air filter medium for home appliances having the structure shown in FIG. 20 was produced. The pressure loss of the air filter medium 20 for home appliances at a wind speed of 5.3 cm / sec is 73.5 Pa (7.5 mmH 2 O), and the collection efficiency for particles having a particle diameter of 0.3 to 0.5 μm is 99. .98%, PF value was 49.

実施例1の家電製品用エアフィルタ濾材20を水道水に浸し、歯ブラシを使用し表面を軽くこすって約5分間洗浄した後、約2日間自然乾燥させた。乾燥後の前記家電製品用エアフィルタ濾材20の風速5.3cm/秒での圧力損失は74Pa(7.5mmH2O)であり、粒子径0.3〜0.5μm粒子対象の捕集効率は99.98%であり、洗浄前の性能を示した。 The air filter medium 20 for household appliances of Example 1 was immersed in tap water, and the surface was lightly rubbed with a toothbrush for about 5 minutes, and then naturally dried for about 2 days. The pressure loss at a wind speed of 5.3 cm / sec of the air filter medium 20 for home appliances after drying is 74 Pa (7.5 mmH 2 O), and the collection efficiency of particles having a particle size of 0.3 to 0.5 μm is as follows. 99.98%, indicating the performance before washing.

(実施例2)
本実施例では、PTFE多孔質膜11を前記実施例1と全く同様にして得た。次に、目付け量100g/m2のポリエチレン/ポリエステル複合型不織布を用意し、表面に顔料(フタロシアニンブルー)と抗菌剤(銀系抗菌剤)を混入したコーティング液を塗布した後、風乾して、抗菌・着色処理を施した。続いて、前記PTFE多孔質膜の下流側に支持層として、前記ポリエチレン/ポリエステル複合型不織布を重ねた後、熱ラミネートにより一体化して、図1に示す構造の家電製品用エアフィルタ濾材を作製した。この家電製品用エアフィルタ濾材の風速5.3cm/秒での圧力損失は72.0Pa(7.3mmH2O)であり、粒子径0.3〜0.5μm粒子対象の捕集効率は99.98%、PF値は50であった。
(Example 2)
In this example, a PTFE porous membrane 11 was obtained in exactly the same manner as in Example 1. Next, a polyethylene / polyester composite nonwoven fabric with a basis weight of 100 g / m 2 was prepared, and a coating liquid containing a pigment (phthalocyanine blue) and an antibacterial agent (silver antibacterial agent) was applied to the surface, and then air-dried. Antibacterial and coloring treatment was applied. Subsequently, the polyethylene / polyester composite nonwoven fabric was stacked as a support layer on the downstream side of the porous PTFE membrane, and then integrated by heat lamination to produce an air filter medium for home appliances having the structure shown in FIG. . This air filter medium for home appliances has a pressure loss of 72.0 Pa (7.3 mmH 2 O) at a wind speed of 5.3 cm / sec, and a trapping efficiency of particles having a particle diameter of 0.3 to 0.5 μm is 99. 98% and the PF value was 50.

実施例2の家電製品用エアフィルタ濾材10を水道水に浸し、歯ブラシを使用し表面を軽くこすって約5分間洗浄した後、約2日間自然乾燥させた。乾燥後の前記家電製品用エアフィルタ濾材10の風速5.3cm/秒での圧力損失は74Pa(7.5mmH2O)であり、粒子径0.3〜0.5μm粒子対象の捕集効率は99.98%であり、洗浄前の性能を示した。 The air filter medium 10 for household appliances of Example 2 was immersed in tap water, and the surface was lightly rubbed with a toothbrush for about 5 minutes, and then naturally dried for about 2 days. The pressure loss at the wind speed of 5.3 cm / sec of the air filter medium 10 for household appliances after drying is 74 Pa (7.5 mmH 2 O), and the collection efficiency of particles having a particle size of 0.3 to 0.5 μm is as follows. 99.98%, indicating the performance before washing.

(比較例1)
家電製品用に広く販売されているポリプロピレン製メルトブロー不織布を用いたエレクトレットフィルタを比較例1とした。前記エレクトレットフィルタの風速5.3cm/秒での圧力損失は35.28Pa(3.6mmH2O)であり、粒子径0.3〜0.5μm粒子の捕集効率は99.7%、PF値は70であった。
(Comparative Example 1)
An electret filter using a polypropylene melt-blown nonwoven fabric widely sold for home appliances was designated as Comparative Example 1. The electret filter had a pressure loss of 35.28 Pa (3.6 mmH 2 O) at a wind speed of 5.3 cm / sec, a particle diameter of 0.3 to 0.5 μm, a particle collection efficiency of 99.7%, and a PF value. Was 70.

前記エレクトレットフィルタを水道水に約5分間浸した後、約2日間自然乾燥させた。乾燥後の前記エレクトレットフィルタの風速5.3cm/秒での圧力損失は36Pa(3.6mmH2O)であったが、粒子径0.3〜0.5μm粒子対象の捕集効率は80%となり、大きく低下した。 The electret filter was immersed in tap water for about 5 minutes, and then naturally dried for about 2 days. Although the pressure loss of the electret filter after drying at a wind speed of 5.3 cm / sec was 36 Pa (3.6 mmH 2 O), the collection efficiency for particles having a particle size of 0.3 to 0.5 μm was 80%. , Fell significantly.

前記実施例1、2および比較例1の結果から、実施例1、2および比較例1のエアフィルタ濾材は、いずれも圧力損失が低く、かつ捕集効率が高い。しかしながら、比較例1のエアフィルタ濾材は水洗によって、捕集効率が著しく低下することがわかる。   From the results of Examples 1 and 2 and Comparative Example 1, the air filter media of Examples 1, 2 and Comparative Example 1 all have low pressure loss and high collection efficiency. However, it can be seen that the air filter medium of Comparative Example 1 has a markedly reduced collection efficiency by washing with water.

(実施例3)
まず、PTFE微粉末100重量部に対して流動パラフィン(液状潤滑剤)20重量部を加えたペースト状の混合物を作製した。このペースト状混合物を押出し成形により丸棒状に成形し、さらにこの丸棒状成形体を圧延して、シート状PTFE成形体(厚み0.2mm)を得た。前記シート状PTFE成形体から前記液状潤滑剤をトリクレンによる抽出により除去した後、300℃の延伸温度で前記シート状PTFE成形体をシート長手方向に2000%延伸した。続いて、このシート状PTFE成形体を150℃の延伸温度でシート幅方向に5000%延伸して、PTFE多孔質膜(厚み4μm、空孔率95%、圧力損失49Pa(5.0mmH2O)、捕集効率99.97%)を得た。
(Example 3)
First, a paste-like mixture was prepared by adding 20 parts by weight of liquid paraffin (liquid lubricant) to 100 parts by weight of PTFE fine powder. This paste-like mixture was formed into a round bar shape by extrusion molding, and the round bar-like molded body was rolled to obtain a sheet-like PTFE molded body (thickness 0.2 mm). After the liquid lubricant was removed from the sheet-like PTFE compact by extraction with trichlene, the sheet-shaped PTFE compact was stretched 2000% in the longitudinal direction of the sheet at a stretching temperature of 300 ° C. Subsequently, this sheet-like PTFE molded body was stretched by 5000% in the sheet width direction at a stretching temperature of 150 ° C. to obtain a PTFE porous membrane (thickness 4 μm, porosity 95%, pressure loss 49 Pa (5.0 mmH 2 O)). And a collection efficiency of 99.97%).

前記PTFE多孔質膜の両面に、ポリエチレンテレフタレートを芯、ポリエチレン(融点約130℃)を鞘とする芯鞘繊維から形成される不織布(エルベス T0105WDO(商品名)、ユニチカ株式会社製、厚み100μm、目付量15g/m2、曲げ剛性5.0×10-6N・cm2/cm)を重ね、熱ラミネートにより一体化して、PTFE多孔質膜の両面に不織布が部分的に接合された3層構造のエアフィルタ濾材(厚み130μm、圧力損失58.8Pa(6mmH2O)、捕集効率99.97%、PF値59)を得た。 Non-woven fabric (Elves T0105WDO (trade name), manufactured by Unitika Ltd., thickness 100 μm, weight per unit area) formed from a core-sheath fiber having polyethylene terephthalate as a core and polyethylene (melting point: about 130 ° C.) as a sheath on both sides of the PTFE porous membrane A three-layer structure in which a nonwoven fabric is partially bonded to both sides of a PTFE porous membrane, with an amount of 15 g / m 2 and a bending rigidity of 5.0 × 10 −6 N · cm 2 / cm). Air filter medium (thickness 130 μm, pressure loss 58.8 Pa (6 mmH 2 O), collection efficiency 99.97%, PF value 59).

実施例3で得たエアフィルタ濾材を、水道水中で3日間浸漬した。風乾した後のエアフィルタ濾材は、圧力損失55.0Pa(5.5mmH2O)、捕集効率99.97%およびPF値63であった。 The air filter medium obtained in Example 3 was immersed in tap water for 3 days. The air filter medium after air drying had a pressure loss of 55.0 Pa (5.5 mmH 2 O), a collection efficiency of 99.97%, and a PF value of 63.

(比較例2)
市販の一般的な電気掃除機用紙製フィルタバック(旭化成ライフ&リビング株式会社製、そうじ機紙パック(商品名))のエアフィルタ濾材を比較例2とした。このエアフィルタ濾材の厚みは195μm、圧力損失は50Pa(5.1mmH2O)、捕集効率は<10%、PF値は<1であった。
(Comparative Example 2)
The air filter medium of a commercially available general vacuum cleaner paper filter back (Asahi Kasei Life & Living Co., Ltd., Cleanser paper pack (trade name)) was used as Comparative Example 2. The air filter media had a thickness of 195 μm, a pressure loss of 50 Pa (5.1 mmH 2 O), a collection efficiency of <10%, and a PF value of <1.

前記実施例3および比較例2の結果から、実施例3のエアフィルタ濾材は、圧力損失が低く、かつ捕集効率が高く、PF値も高かった。一方、比較例2のエアフィルタ濾材は圧力損失が低いが、捕集効率も低く、PF値が低かった。従って、実施例3のエアフィルタ濾材は、低圧力損失と高捕集効率を両立する濾材を含むエアフィルタ濾材である。しかも、本発明のエアフィルタ濾材はPTFE多孔質膜を使用しているため、水分存在下にも捕集効率が低下しない。   From the results of Example 3 and Comparative Example 2, the air filter medium of Example 3 had low pressure loss, high collection efficiency, and high PF value. On the other hand, the air filter medium of Comparative Example 2 had a low pressure loss, but also had a low collection efficiency and a low PF value. Therefore, the air filter medium of Example 3 is an air filter medium including a filter medium that achieves both low pressure loss and high collection efficiency. Moreover, since the air filter medium of the present invention uses a PTFE porous membrane, the collection efficiency does not decrease even in the presence of moisture.

本発明の家電製品用エアフィルタ濾材は、家庭用掃除機、家庭用空気清浄機、家庭用空調機等、各種家電製品用のエアフィルタ濾材として利用可能である。   The air filter medium for home appliances of the present invention can be used as an air filter medium for various home appliances such as a home vacuum cleaner, a home air cleaner, and a home air conditioner.

本発明の家電製品用エアフィルタ濾材の一例の断面図である。It is sectional drawing of an example of the air filter medium for household appliances of this invention. 本発明の家電製品用エアフィルタ濾材のその他の例の断面図である。It is sectional drawing of the other example of the air filter medium for household appliances of this invention. 本発明の電気掃除機用フィルタバックの一例の断面図である。It is sectional drawing of an example of the filter bag for vacuum cleaners of this invention. 前記電気掃除機用フィルタバックの一例の正面図である。It is a front view of an example of the filter back for the vacuum cleaner.

符号の説明Explanation of symbols

10、20 家電製品用エアフィルタ濾材
11、21 PTFE多孔質膜
12、22、支持層
30 電気掃除機用フィルタバック
32 支持板
32a 切欠
32b 孔
33 吸引口
10, 20 Air filter medium for home appliances 11, 21 PTFE porous membrane 12, 22, support layer 30 Filter back for vacuum cleaner 32 Support plate 32a Notch 32b Hole 33 Suction port

Claims (13)

家電製品用エアフィルタ濾材であって、風速5.3cm/秒での圧力損失が120Pa以下であり、粒子径0.3〜0.5μm粒子の捕集効率が95%以上であり、多層構造であり、そのうちの少なくとも一層はポリテトラフルオロエチレン多孔質膜から形成されているエアフィルタ濾材。   An air filter medium for home appliances, having a pressure loss of 120 Pa or less at a wind speed of 5.3 cm / sec, a particle diameter of 0.3 to 0.5 μm, a collection efficiency of 95% or more, and a multilayer structure. An air filter medium in which at least one of them is formed of a polytetrafluoroethylene porous membrane. 下記式のPF値が25以上である請求項1記載のエアフィルタ濾材。
PF値={−log(透過率/100)/圧力損失}×100
透過率=100−捕集効率
The air filter medium according to claim 1, wherein the PF value of the following formula is 25 or more.
PF value = {− log (transmittance / 100) / pressure loss} × 100
Transmittance = 100-collection efficiency
多層構造の少なくとも一層が支持層である請求項1または2記載のエアフィルタ濾材。   The air filter medium according to claim 1 or 2, wherein at least one layer of the multilayer structure is a support layer. 前記支持層の単位面積当たりの重量が、10〜200g/m2の範囲にある請求項3記載のエアフィルタ濾材。 The air filter medium according to claim 3, wherein the weight per unit area of the support layer is in the range of 10 to 200 g / m2. その一部若しくは全部に抗菌処理が施されている請求項1〜4のいずれかに記載のエアフィルタ濾材。   The air filter medium according to any one of claims 1 to 4, wherein an antibacterial treatment is applied to part or all of the air filter medium. その一部若しくは全部に着色処理が施されている請求項1〜5のいずれかに記載のエアフィルタ濾材。   The air filter medium according to any one of claims 1 to 5, wherein a color treatment is applied to a part or all of the air filter medium. 適用対象の家電製品が、家庭用掃除機、家庭用空気清浄機および家庭用空調機の少なくとも一つである請求項1〜6のいずれかに記載のエアフィルタ濾材。   The air filter medium according to any one of claims 1 to 6, wherein the home appliance to be applied is at least one of a home vacuum cleaner, a home air cleaner, and a home air conditioner. 電気掃除機用フィルタバックに用いられる、請求項1〜7のいずれかに記載のエアフィルタ濾材。   The air filter medium according to any one of claims 1 to 7, which is used for a filter back for a vacuum cleaner. 請求項1〜7のいずれかに記載のエアフィルタ濾材を含む、電気掃除機用フィルタバック。   The filter bag for vacuum cleaners containing the air filter medium in any one of Claims 1-7. 請求項1〜7のいずれかに記載のエアフィルタ濾材を用いた家電製品。   Household appliances using the air filter medium according to any one of claims 1 to 7. 請求項1〜7のいずれかに記載のエアフィルタ濾材を用いた家庭用掃除機。   The household vacuum cleaner using the air filter material in any one of Claims 1-7. 請求項1〜7のいずれかに記載のエアフィルタ濾材を用いた家庭用空気清浄機。   A domestic air cleaner using the air filter medium according to claim 1. 請求項1〜7のいずれかに記載のエアフィルタ濾材を用いた家庭用空調機。   A domestic air conditioner using the air filter medium according to any one of claims 1 to 7.
JP2004247381A 2004-08-26 2004-08-26 Air filter medium for domestic electric appliance Pending JP2006061830A (en)

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