JP2006009187A - Method for producing inorganic fiber paper - Google Patents
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本発明は、ガラス繊維、セラミック繊維等の微細径の無機繊維を主体とし、湿式抄造によって得られる低坪量の無機繊維ペーパーを安定した品質で連続製造するための製造方法に関する。 The present invention relates to a production method for continuously producing low-basis-weight inorganic fiber paper obtained mainly by wet papermaking with stable quality, mainly composed of inorganic fibers such as glass fibers and ceramic fibers.
従来、ガラス繊維、セラミック繊維等の微細径の無機繊維を主体とし、湿式抄造によって得られる無機繊維ペーパーが知られている。
このような無機繊維ペーパーは、通常、無機繊維等の原料を水中に分散・混合して得た原料液を通常の円網抄紙機、短網抄紙機等を用いて湿式抄造し、乾燥することによって連続的に製造され、連続した無機繊維ペーパーとして生産されている。
Conventionally, inorganic fiber papers mainly made of fine inorganic fibers such as glass fibers and ceramic fibers and obtained by wet papermaking are known.
Such inorganic fiber paper is usually made by wet-making a raw material liquid obtained by dispersing and mixing raw materials such as inorganic fibers in water using a normal circular net paper machine, a short net paper machine, and the like, and then drying. Produced continuously as a continuous inorganic fiber paper.
このような無機繊維ペーパーは、耐熱性、耐腐食性、耐薬品性を有し、高空隙率であることから、近年、様々な用途での使用が検討され始めている。このような状況下、例えば、軽量化や小型化が求められる用途では、より低坪量、すなわち、より薄型の無機繊維ペーパーが求められるようになってきている。
ところが、上記したような湿式抄造法によって、１４ｇ／ｍ2以下の非常に低坪量の無機繊維ペーパーを製造しようとすると、ペーパーの地合（厚さ、坪量、密度の均質性）が不均質となり、適正な品質の無機繊維ペーパーを安定的に歩留り良く生産することができなくなるという問題があった。
そこで、本発明は、このような従来の問題点に鑑み、ガラス繊維、セラミック繊維等の微細径の無機繊維を主体とし、湿式抄造によって得られる低坪量の無機繊維ペーパーを安定した品質で連続製造することが可能な無機繊維ペーパーの製造方法を提供することを目的とする。
Since such inorganic fiber paper has heat resistance, corrosion resistance, chemical resistance, and high porosity, in recent years, use in various applications has begun to be examined. Under such circumstances, for example, in applications that require weight reduction and downsizing, a lower basis weight, that is, a thinner inorganic fiber paper has been required.
However, when an inorganic fiber paper having a very low basis weight of 14 g / m 2 or less is produced by the wet papermaking method as described above, the formation of the paper (thickness, basis weight, uniformity of density) is not good. There has been a problem that the inorganic fiber paper of uniform quality cannot be produced stably and with a good yield.
Therefore, in view of such conventional problems, the present invention is mainly composed of inorganic fibers having a small diameter such as glass fibers and ceramic fibers, and low-basis weight inorganic fiber paper obtained by wet papermaking is continuously produced with stable quality. It aims at providing the manufacturing method of the inorganic fiber paper which can be manufactured.
本発明者等は、前記目的を達成するべく、鋭意検討を重ねた結果、１４ｇ／ｍ2以下の非常に低坪量の無機繊維ペーパーを製造する場合に、ペーパーの地合（厚さ、坪量、密度の均質性）が不均質となる現象の原因として、原料液中での無機繊維等の原料の分散不具合が主な原因であることを突き止めた。更に、この分散不具合は、原料を水中で分散させて原料液を得る際に繊維材料等が分散し切らずに当初の塊（結束状態等）のまま残ったり、一旦分散した繊維材料等が分子間引力によって再凝集することによって引き起こされていることが分かった。
本発明の無機繊維ペーパーの製造方法は、かかる知見に基づきなされた発明であって、請求項１に記載の通り、平均繊維径が５μｍ以下の無機繊維が５０質量％以上で構成され、坪量が１４ｇ／ｍ2以下である湿式抄造によって得られる無機繊維ペーパーの製造方法において、湿式抄造時の原料液濃度（原料液の原料濃度）Ｄと前記ペーパーの坪量Ｗの関係Ｄ／Ｗが０．００５以下となるようにしたことを特徴とする。
また、請求項２記載の無機繊維ペーパーの製造方法は、請求項１記載の無機繊維ペーパーの製造方法において、前記無機繊維ペーパーは、前記無機繊維が８０質量％以上で構成されることを特徴とする。
また、請求項３記載の無機繊維ペーパーの製造方法は、請求項１又は２記載の無機繊維ペーパーの製造方法において、前記無機繊維が平均繊維径１．５μｍ以下であることを特徴とする。
また、請求項４記載の無機繊維ペーパーの製造方法は、請求項１乃至３の何れかに記載の無機繊維ペーパーの製造方法において、前記無機繊維が無機質短繊維であることを特徴とする。
また、請求項５記載の無機繊維ペーパーの製造方法は、請求項１乃至４の何れかに記載の無機繊維ペーパーの製造方法において、前記無機繊維がガラス繊維であることを特徴とする。
As a result of intensive investigations to achieve the above object, the present inventors have found that when producing an inorganic fiber paper having a very low basis weight of 14 g / m 2 or less, the formation of the paper (thickness, As a cause of the phenomenon that the homogeneity of quantity and density) is a non-homogeneous phenomenon, it has been found that the main cause is a dispersion failure of raw materials such as inorganic fibers in the raw material liquid. Furthermore, this dispersion failure is caused when the raw material is dispersed in water to obtain the raw material liquid, and the fiber material or the like does not completely disperse but remains in the original lump (bonded state, etc.) It was found that it was caused by reaggregation due to the attractive force.
The manufacturing method of the inorganic fiber paper of the present invention is an invention made based on such knowledge, and as described in claim 1, the inorganic fiber having an average fiber diameter of 5 μm or less is composed of 50% by mass or more, and has a basis weight. In the method for producing an inorganic fiber paper obtained by wet papermaking having a weight of 14 g / m 2 or less, the relationship D / W between the raw material liquid concentration (raw material concentration) D during wet papermaking and the basis weight W of the paper is 0. .005 or less.
Moreover, the manufacturing method of the inorganic fiber paper of Claim 2 is a manufacturing method of the inorganic fiber paper of Claim 1, The said inorganic fiber paper is comprised with the said inorganic fiber being 80 mass% or more, It is characterized by the above-mentioned. To do.
The method for producing an inorganic fiber paper according to claim 3 is the method for producing an inorganic fiber paper according to claim 1 or 2, wherein the inorganic fibers have an average fiber diameter of 1.5 μm or less.
The method for producing an inorganic fiber paper according to claim 4 is the method for producing an inorganic fiber paper according to any one of claims 1 to 3, wherein the inorganic fiber is an inorganic short fiber.
The method for producing an inorganic fiber paper according to claim 5 is the method for producing an inorganic fiber paper according to any one of claims 1 to 4, wherein the inorganic fiber is a glass fiber.
本発明によれば、ガラス繊維、セラミック繊維等の微細径の無機繊維を主体とし、湿式抄造によって得られる無機繊維ペーパーの製造方法において、湿式抄造時の原料液濃度Ｄと無機繊維ペーパーの坪量Ｗの関係Ｄ／Ｗが０．００５以下となるようにして、得ようとする無機繊維ペーパーの坪量に応じた原料液濃度としたことにより、原料液中での原料の分散が良好となり、特に分子間引力による再凝集に起因した原料の分散不具合の発生を極力排除できることから、平均繊維径が５μｍ以下、より好ましくは１．５μｍ以下の微細径の無機繊維が５０質量％以上、より好ましくは８０質量％以上で構成され、１４ｇ／ｍ2以下の非常に低坪量、すなわち、非常に薄型の無機繊維ペーパーを、良好な地合及び適正な品質で歩留り良く安定的に連続生産することができるようになり、工業的に利用価値が高い。 According to the present invention, in the method for producing inorganic fiber paper mainly composed of fine fibers such as glass fiber and ceramic fiber, and obtained by wet papermaking, the raw material liquid concentration D and the basis weight of the inorganic fiber paper at the time of wet papermaking. By making the raw material liquid concentration according to the basis weight of the inorganic fiber paper to be obtained so that the relationship D / W of W is 0.005 or less, the dispersion of the raw material in the raw material liquid becomes good, In particular, since it is possible to eliminate as much as possible the occurrence of raw material dispersion due to reaggregation due to intermolecular attraction, the average fiber diameter is 5 μm or less, more preferably 1.5 μm or less of fine fiber is more preferably 50% by mass or more. is composed of 80 mass% or more, 14 g / m 2 or less very low basis weight, i.e., a very thin inorganic fiber paper, high yield stably with good texture and adequate quality communication It will be able to produce, industrially high utility value.
本発明の無機繊維ペーパーの製造方法によって得ようとする無機繊維ペーパーは、平均繊維径が５μｍ以下、より好ましくは１．５μｍ以下である微細径の無機繊維が５０質量％以上、より好ましくは８０質量％で構成され、１４ｇ／ｍ2以下の非常に低坪量の湿式抄造によって得られる無機繊維ペーパーである。
本発明の無機繊維ペーパーの製造方法は、このような無機繊維ペーパーを従来の一般的な円網抄紙機や短網抄紙機等による湿式抄造法を用いて適正な品質で歩留り良く安定的に連続製造するため、湿式抄造時の原料液濃度（原料液の原料濃度）Ｄ（質量％）と無機繊維ペーパーの坪量Ｗ（ｇ／ｍ2）の関係Ｄ／Ｗが０．００５以下となるようにしたものである。
つまり、前述したように、従来の問題点であった１４ｇ／ｍ2以下の非常に低坪量の無機繊維ペーパーを製造する場合にペーパーの地合が不均質となる現象は、通常一般的に起こり得る（完全には避けられない）原料液中での原料の分散不具合が、ペーパーの低坪量化、すなわち、ペーパーの薄型化によって、地合悪化という形で顕在化された現象であると分析できるが、この原料液中での原料の分散不具合という現象、特に、前述したように一旦分散した原料が再凝集することで引き起こされる現象については、これを完全に防ぐことは不可能であり、問題解決の考え方としては、前記分散不具合現象をペーパーの地合品質上問題のないレベルにまで落とすということしか方法がないと考えられた。このため、液中で原料が分散し易く、また、再凝集しにくくするため、原料液濃度を、従来よりも低いレベルに、得ようとする無機繊維ペーパーの坪量に応じて制御する方法が考えられた。検討を重ねた結果、湿式抄造時の原料液濃度Ｄ（質量％）と無機繊維ペーパーの坪量Ｗ（ｇ／ｍ2）の関係Ｄ／Ｗが０．００５以下となるような条件に前記原料液濃度を設定することで、ペーパーの地合が不均質となる前記問題をほぼ解消でき、前記したような本発明の非常に低坪量の無機繊維ペーパーを適正な品質で歩留り良く安定的に連続生産できるようになることが分かった。
The inorganic fiber paper to be obtained by the method for producing the inorganic fiber paper of the present invention has an average fiber diameter of 5 μm or less, more preferably 1.5 μm or less, and 50 μ% or more, more preferably 80% by weight of fine inorganic fibers. It is an inorganic fiber paper composed of mass% and obtained by wet papermaking with a very low basis weight of 14 g / m 2 or less.
The method for producing the inorganic fiber paper of the present invention is such that the inorganic fiber paper is continuously produced with a good quality and a good yield by using a wet papermaking method using a conventional general paper machine or short paper machine. In order to manufacture, the relationship D / W between the raw material liquid concentration (raw material concentration of raw material liquid) D (mass%) and the basis weight W (g / m 2 ) of the inorganic fiber paper is 0.005 or less. It is a thing.
That is, as described above, when producing an inorganic fiber paper having a very low basis weight of 14 g / m 2 or less, which is a conventional problem, the phenomenon that the formation of the paper is inhomogeneous is generally common. Analyzes that the failure to disperse the raw material in the raw material liquid (which is completely unavoidable) is a phenomenon manifested in the form of worsening formation due to the lower basis weight of the paper, that is, the thinner paper. However, it is impossible to completely prevent the phenomenon of the dispersion failure of the raw material in the raw material liquid, especially the phenomenon caused by the re-aggregation of the raw material once dispersed as described above. The only way to solve the problem was to reduce the phenomenon of dispersion failure to a level where there was no problem in the quality of the paper. For this reason, in order to make a raw material disperse | distribute easily in a liquid and to make it difficult to re-aggregate, the method of controlling a raw material liquid density | concentration according to the basic weight of the inorganic fiber paper to obtain at a level lower than before. it was thought. As a result of repeated studies, the above-mentioned raw material was subjected to a condition such that the relationship D / W between the raw material liquid concentration D (mass%) during wet papermaking and the basis weight W (g / m 2 ) of the inorganic fiber paper was 0.005 or less. By setting the liquid concentration, the above-mentioned problem that the texture of the paper is inhomogeneous can be almost solved, and the very low basis weight inorganic fiber paper of the present invention as described above can be stably produced with a proper quality and a good yield. It turned out that it became possible to produce continuously.
前記無機繊維としては、ガラス繊維や、シリカ−アルミナ繊維、シリカ繊維、アルミナ繊維等のセラミック繊維や、ロックウール、スラグウール等の人造非晶質系繊維、又は、チタン酸カリウムウィスカー、炭酸カルシウムウィスカー等の針状結晶質繊維、又は、アスベスト、セピオライト等の微細鉱物繊維等の中から１種あるいは２種以上を組み合わせて使用できる。実際には、無機繊維ペーパーの用途ごとに求められる機能や特性等に合わせて適宜適切な無機繊維を選択して使用することになる。 Examples of the inorganic fibers include glass fibers, ceramic fibers such as silica-alumina fibers, silica fibers, and alumina fibers, artificial amorphous fibers such as rock wool and slag wool, or potassium titanate whiskers and calcium carbonate whiskers. Can be used alone or in combination of two or more kinds of acicular crystalline fibers such as fine mineral fibers such as asbestos and sepiolite. Actually, appropriate inorganic fibers are appropriately selected and used in accordance with functions and characteristics required for each use of the inorganic fiber paper.
次に、本発明の実施例を比較例及び従来例と共に詳細に説明する。
（実施例１）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０１０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ５０μｍ、坪量６．７ｇ／ｍ2の無機繊維ペーパーを得た。
Next, examples of the present invention will be described in detail together with comparative examples and conventional examples.
Example 1
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.010% by mass. . This raw material liquid was wet-made using a conventional circular net paper machine to form a sheet, and dried to obtain an inorganic fiber paper having a thickness of 50 μm and a basis weight of 6.7 g / m 2 .
（実施例２）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０２０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ５１μｍ、坪量６．７ｇ／ｍ2の無機繊維ペーパーを得た。
(Example 2)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.020% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 51 μm and a basis weight of 6.7 g / m 2 .
（実施例３）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０３０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ５３μｍ、坪量６．７ｇ／ｍ2の無機繊維ペーパーを得た。
Example 3
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.030% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 53 μm and a basis weight of 6.7 g / m 2 .
（比較例１）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０４０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ５６μｍ、坪量６．７ｇ／ｍ2の無機繊維ペーパーを得た。
(Comparative Example 1)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.040% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 56 μm and a basis weight of 6.7 g / m 2 .
（従来例）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．２６０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ２００μｍ、坪量３０．６ｇ／ｍ2の無機繊維ペーパーを得た。
(Conventional example)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.260% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 200 μm and a basis weight of 30.6 g / m 2 .
（実施例４）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０１０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ９０μｍ、坪量１３．１ｇ／ｍ2の無機繊維ペーパーを得た。
Example 4
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.010% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 90 μm and a basis weight of 13.1 g / m 2 .
（実施例５）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０３０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ９２μｍ、坪量１３．１ｇ／ｍ2の無機繊維ペーパーを得た。
(Example 5)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.030% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 92 μm and a basis weight of 13.1 g / m 2 .
（実施例６）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０５０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ９５μｍ、坪量１３．１ｇ／ｍ2の無機繊維ペーパーを得た。
(Example 6)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.050% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 95 μm and a basis weight of 13.1 g / m 2 .
（比較例２）
無機繊維として平均繊維径０．６μｍのガラス短繊維９５質量％と、有機バインダとしてミクロフィブリル化セルロース５質量％を水中で分散・混合し、原料濃度が０．０８０質量％の原料液を得た。この原料液を通常の円網抄紙機を用いて湿式抄造してシート化し、乾燥して、厚さ９９μｍ、坪量１３．１ｇ／ｍ2の無機繊維ペーパーを得た。
(Comparative Example 2)
95% by mass of short glass fibers having an average fiber diameter of 0.6 μm as inorganic fibers and 5% by mass of microfibrillated cellulose as an organic binder were dispersed and mixed in water to obtain a raw material liquid having a raw material concentration of 0.080% by mass. . This raw material liquid was wet-made using a normal circular net paper machine to form a sheet and dried to obtain an inorganic fiber paper having a thickness of 99 μm and a basis weight of 13.1 g / m 2 .
次に、上記にて得られた実施例１〜６、比較例１〜２及び従来例の各無機繊維ペーパーについて、以下の方法により各種特性評価を行った。結果を表１及び表２に示す。また、実施例２及び比較例１の各無機繊維ペーパーの表面写真を図１に示す。
〈厚さ〉
ダイヤルシックネスゲージを用いて、加重１９．６ｋＰａにて測定した。
〈坪量〉
０．１ｍ2の質量を測定し、これを１０倍して坪量とした。
〈密度〉
坪量÷厚さの計算値。
〈地合（表面平滑度合い）〉
表面平滑度合いを目視にて判定した。判定は５段階で行い、表面平滑度合いの高いものから順に、５、４、３、２、１の評点を付けた。
〈地合（厚さ均一度合い）〉
厚さ均一度合いを目視にて判定した。判定は５段階で行い、厚さ均一度合いの高いものから順に、５、４、３、２、１の評点を付けた。
〈引張強度〉
等速度引張試験機にて測定した。測定条件は、引張速度２５ｍｍ／分、チャック間距離１００ｍｍとして行った。
〈空隙率〉
次式により算出した。尚、バインダは構成比率が低く影響が小さいため省略した。尚、ここでは、無機繊維、すなわちガラス繊維の密度を２．５４として計算した。
空隙率（％）＝｛（無機繊維の密度）−（無機繊維ペーパーの密度）｝÷（無機繊維の密度）×１００
Next, various characteristics evaluation was performed by the following method about each inorganic fiber paper of Examples 1-6 obtained above, Comparative Examples 1-2, and a prior art example. The results are shown in Tables 1 and 2. Moreover, the surface photograph of each inorganic fiber paper of Example 2 and Comparative Example 1 is shown in FIG.
<thickness>
Measurement was performed using a dial thickness gauge at a load of 19.6 kPa.
<Basis weight>
A mass of 0.1 m 2 was measured, and this was multiplied by 10 to obtain a basis weight.
<density>
Basis weight ÷ calculated thickness.
<Gene (surface smoothness)>
The degree of surface smoothness was determined visually. Judgment was made in five stages, and grades of 5, 4, 3, 2, 1 were assigned in order from the highest surface smoothness.
<Ground (thickness uniformity)>
The degree of thickness uniformity was determined visually. Judgment was made in five stages, and grades of 5, 4, 3, 2, 1 were assigned in order from the highest thickness uniformity.
<Tensile strength>
Measurements were made with a constant velocity tensile tester. The measurement conditions were a tensile speed of 25 mm / min and a distance between chucks of 100 mm.
<Porosity>
It was calculated by the following formula. The binder was omitted because the composition ratio was low and the influence was small. Here, the density of the inorganic fiber, that is, the glass fiber was calculated as 2.54.
Porosity (%) = {(density of inorganic fiber) − (density of inorganic fiber paper)} ÷ (density of inorganic fiber) × 100
表１及び表２に示す結果から以下のようなことが分かった。
（１）本発明の実施例１〜６の無機繊維ペーパーは、湿式抄造時の原料液濃度Ｄとペーパーの坪量Ｗの関係Ｄ／Ｗが０．００５以下となるように原料液濃度を設定して湿式抄造されたため、坪量が１４ｇ／ｍ2以下と非常に低坪量であるにも拘わらず、地合が良好で、引張強度が高く、良好な品質を有したペーパーとなった。
（２）これに対して、比較例１〜２の無機繊維ペーパーは、湿式抄造時の原料液濃度Ｄとペーパーの坪量Ｗの関係Ｄ／Ｗが０．００５を超えるような原料液濃度に設定されて湿式抄造されたため、目的とする坪量が１４ｇ／ｍ2以下のペーパーを得ることはできたものの、地合が悪く、引張強度が低く、良好な品質のペーパーとはならなかった。
（３）尚、従来例の無機繊維ペーパーは、地合が良好で、引張強度が高く、良好な品質のペーパーであるが、坪量が高い。
From the results shown in Tables 1 and 2, the following was found.
(1) In the inorganic fiber paper of Examples 1 to 6 of the present invention, the raw material liquid concentration is set so that the relationship D / W between the raw material liquid concentration D and the basis weight W of the papermaking is 0.005 or less. Since the paper was wet-made, the paper had good formation, high tensile strength, and good quality despite its very low basis weight of 14 g / m 2 or less.
(2) On the other hand, the inorganic fiber papers of Comparative Examples 1 and 2 have such a raw material liquid concentration that the relationship D / W between the raw material liquid concentration D and the basis weight W of the papermaking exceeds 0.005. Since it was set and wet papermaking, a paper having a target basis weight of 14 g / m 2 or less could be obtained, but the formation was poor, the tensile strength was low, and the paper did not have good quality.
(3) In addition, the inorganic fiber paper of the conventional example is a paper having good formation, high tensile strength, and good quality, but has a high basis weight.
Claims (5)
The method for producing an inorganic fiber paper according to any one of claims 1 to 4, wherein the inorganic fiber is a glass fiber.
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| US8641868B2 (en) | 2011-03-31 | 2014-02-04 | Nichias Corporation | Inorganic fiber paper and method of producing the same |
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| US8641868B2 (en) | 2011-03-31 | 2014-02-04 | Nichias Corporation | Inorganic fiber paper and method of producing the same |
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