JP5306149B2 - Tray mat and method for producing dry nonwoven fabric for tray mat - Google Patents
Tray mat and method for producing dry nonwoven fabric for tray mat Download PDFInfo
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Abstract
Description
本発明は、主にセルロース繊維を素材とし、特にトレイマット用に好適な乾式不織布に関する。 The present invention relates to a dry nonwoven fabric mainly made of cellulose fibers and particularly suitable for tray mats.
スーパーマーケット等において、豚肉や牛肉などの各種精肉類や鮮魚及びその切り身等は、トレイに取り分けてさらに透明フィルムで包装した状態で商品として販売されることが一般的である。このような販売形態の場合、店頭に陳列されるうちに、時間の経過に伴って、上記精肉や鮮魚類からドリップ（食材内部からの滲出液）が出てトレイにたまる現象が起きる。これは見た目が悪いだけでなく、商品の傷みを早める原因ともなるので、上記トレイにはドリップを吸収させるためのトレイマットが敷かれている（特許文献１〜３参照）。
このようなトレイマットとしては、適当な大きさにカットされた不織布が用いられている。中でも、セルロース繊維を主材とするラテックスボンド法の乾式不織布は、他の不織布に比べ低密度であり、同一目付であれば単位面積あたりの吸液量が多いため、広く用いられている。
In supermarkets and the like, various meats such as pork and beef, fresh fish, and fillets thereof are generally sold as products in a state of being separated into trays and further wrapped with a transparent film. In the case of such a sales form, as the time elapses, a drip (exudate from the inside of the food material) comes out from the meat and fresh fish and accumulates in the tray as time passes. This not only looks bad, but also causes the product to be damaged earlier, and therefore, the tray is provided with a tray mat for absorbing drip (see Patent Documents 1 to 3).
As such a tray mat, a nonwoven fabric cut to an appropriate size is used. Among them, a latex bond method dry nonwoven fabric mainly composed of cellulose fibers is widely used because it has a lower density than other nonwoven fabrics and has a large liquid absorption per unit area if it has the same basis weight.
ところで、上記トレイマットをトレイに敷く作業は、主に手作業で行われている。その際、作業性の面から上記トレイマットの素材は剛性が高いことが要望されている。しかし、前述のラテックスボンド法の乾式不織布は、低密度であるため繊維交点数が少なく、水系接着剤の強度発現性が低く、結果として剛性の発現性も低い。
上記ラテックスボンド法の乾式不織布の剛性の向上対策としては、水系接着剤の塗工量増加、もしくはより高いガラス転移点を有する樹脂を水系接着剤として用いる等の方法が採用されている。しかし、同一目付における水系接着剤の塗布量の増加は、繊維ウェブ付け量の減少となり、不織布のスケ、ワレ等の欠点が増加して生産性が低下する。また、繊維量減少によって吸液量も低下する。
また、ガラス転移点の高い水系接着剤樹脂を用いた場合には、得られる乾式不織布の破断伸度が低下するため、加工適性が低下する。
By the way, the work of placing the tray mat on the tray is mainly performed manually. In that case, the tray mat material is required to have high rigidity in terms of workability. However, the above-mentioned latex bond method dry nonwoven fabric has a low density and therefore has a small number of fiber intersections, and the strength development of the water-based adhesive is low. As a result, the stiffness development is also low.
As measures for improving the rigidity of the dry nonwoven fabric of the latex bond method, a method of increasing the coating amount of the aqueous adhesive or using a resin having a higher glass transition point as the aqueous adhesive is employed. However, an increase in the application amount of the water-based adhesive with the same basis weight results in a decrease in the amount of fiber web application, which increases the disadvantages of the nonwoven fabric, such as scaling and cracking, and decreases the productivity. Moreover, the amount of liquid absorption also falls by fiber amount reduction.
In addition, when a water-based adhesive resin having a high glass transition point is used, the breakability of the resulting dry nonwoven fabric is lowered, so that the workability is lowered.
本発明の課題は、主としてセルロース繊維を素材とする乾式不織布において、ドリップの吸液量を保ちながら剛性が大きく、特にトレイマット用に好適な乾式不織布の提供である。 An object of the present invention is to provide a dry nonwoven fabric that is mainly made of cellulose fibers and has high rigidity while maintaining the drip liquid absorption, and is particularly suitable for a tray mat.
本発明者は、前記課題を解決するため、以下の手段をとる。
すなわち、本発明の第１は、セルロース繊維を水系接着剤で接着してなる乾式不織布からなるトレイマットであって、前記水系接着剤中に微細繊維状セルロースを含有する乾式不織布からなるトレイマットである。
In order to solve the above-mentioned problems, the present inventor takes the following means.
That is, the first present invention, the cellulose fibers a tray mat comprising a dry nonwoven fabric obtained by bonding with an aqueous adhesive, in a tray mat comprising a dry nonwoven fabric containing fine fibrous cellulose in the water-based adhesive is there.
本発明の第２は、前記微細繊維状セルロースが、繊維幅２〜１０００ｎｍである本発明の第１に記載の乾式不織布からなるトレイマットである。
A second aspect of the present invention is a tray mat comprising the dry nonwoven fabric according to the first aspect of the present invention, wherein the fine fibrous cellulose has a fiber width of 2 to 1000 nm.
本発明の第４は、サクションボックスを有するメッシュコンベヤ上に、乾式のウェブ形成装置でパルプ繊維を空気中で解繊してウェブを形成させ、この該ウェブ上に微細繊維状セルロースを混合した水系接着剤をスプレー塗工し、乾燥装置で乾燥させることによって成形するトレイマット用乾式不織布の製造方法である。
A fourth aspect of the present invention is an aqueous system in which a pulp fiber is defibrated in air with a dry web forming device on a mesh conveyor having a suction box to form a web, and fine fibrous cellulose is mixed on the web. This is a method for producing a dry non-woven fabric for tray mats, which is formed by spraying an adhesive and drying it with a drying device.
本発明により、主としてセルロース繊維を素材とする乾式不織布において、ドリップの吸液量を保ちながら剛性が大きく、特にトレイマット用に好適な乾式不織布の提供が可能となる。 According to the present invention, in a dry nonwoven fabric mainly made of cellulose fibers, it is possible to provide a dry nonwoven fabric particularly suitable for a tray mat, which has high rigidity while maintaining a drip liquid absorption amount.
以下に、本発明の乾式不織布について更に詳しく説明する。
本発明の不織布を構成する原料繊維としては、パルプ繊維を使用する。パルプ繊維の原料としては、木材パルプ（針葉樹、広葉樹）、ラグパルプ、リンターパルプ、リネンパルプ、楮・三椏・雁皮パルプ等の非木材パルプ、古紙パルプ等が使用可能である。また、使用可能なパルプ繊維としては、機械パルプであるＧＰ、ＲＧＰ、ＴＭＰ、化学パルプである亜硫酸パルプ、クラフトパルプ等が使用可能である。なお、この中でも、供給量、品質の安定性、コスト等の面から、針葉樹クラフトパルプが原料として特に好適である。
Below, the dry-type nonwoven fabric of this invention is demonstrated in more detail.
Pulp fiber is used as the raw fiber constituting the nonwoven fabric of the present invention. As the raw material for the pulp fiber, wood pulp (conifers, hardwoods), rug pulp, linter pulp, linen pulp, non-wood pulp such as cocoon, three-silk and husk pulp, waste paper pulp, and the like can be used. As usable pulp fibers, mechanical pulps such as GP, RGP, TMP, chemical pulps such as sulfite pulp and kraft pulp can be used. Of these, softwood kraft pulp is particularly suitable as a raw material in terms of supply amount, quality stability, cost, and the like.
また、本発明の乾式不織布においては、前述のセルロース繊維に、任意に選択した疎水性合成繊維を本発明の趣旨を損ねない程度に適宜配合することが可能である。具体的にはウェブを形成する全繊維に対し、５０質量％以下であれば配合可能である。合成繊維が５０質量％を超えると、トレイマットとしての使用時にドリップの吸液量が低下するために好ましくない。 Moreover, in the dry nonwoven fabric of this invention, it is possible to mix | blend the hydrophobic synthetic fiber arbitrarily selected with the above-mentioned cellulose fiber suitably to such an extent that the meaning of this invention is not impaired. Specifically, it can be blended as long as it is 50% by mass or less based on the total fibers forming the web. When the synthetic fiber exceeds 50% by mass, the drip liquid absorption amount is lowered during use as a tray mat, which is not preferable.
前記疎水性合成繊維としては、ポリエチレン（PE）、ポリプロピレン(PP)等のポリオレフィン系繊維、ポリエステル（PET）繊維、ナイロン繊維等が挙げられる。また、融点の異なる合成樹脂を組み合わせてなる複合繊維を使用することができる。複合繊維の樹脂の組合せとしては、PE／PP、PE／PET、PP／PET、低融点PET／PET、低融点PP／PP、ナイロン-６／ナイロン66等が存在し、その種類は任意に選択可能である。また、複合繊維には異なる樹脂を並列に紡糸したサイドバイサイド型複合繊維、低融点樹脂が外側、高融点樹脂が内側として紡糸した芯鞘型複合繊維等が存在し、そのいずれも使用可能である。
また、添加する疎水性合成繊維は短繊維であって、その繊維長は、１〜１０ｍｍの範囲であることが好ましい。なお、繊維長の異なる繊維を混合して使用することも可能であり、その場合は、それらの長さ加重平均で１〜１０ｍｍの範囲であることが好ましい。
Examples of the hydrophobic synthetic fibers include polyolefin fibers such as polyethylene (PE) and polypropylene (PP), polyester (PET) fibers, and nylon fibers. Moreover, the composite fiber formed by combining synthetic resins having different melting points can be used. There are PE / PP, PE / PET, PP / PET, low-melting point PET / PET, low-melting point PP / PP, nylon-6 / nylon 66, etc. as the combination of resin of the composite fiber, and the type can be selected arbitrarily Is possible. The composite fiber includes a side-by-side type composite fiber obtained by spinning different resins in parallel, a core-sheath type composite fiber spun with the low melting point resin as the outside and the high melting point resin as the inside, and any of them can be used.
Moreover, it is preferable that the hydrophobic synthetic fiber to add is a short fiber, and the fiber length is the range of 1-10 mm. In addition, it is also possible to mix and use the fiber from which fiber length differs, In that case, it is preferable that it is the range of 1-10 mm in those length weighted average.
本発明の乾式不織布は、前述の原料繊維を乾式離解して繊維ウェブを形成する工程（フォーメーション工程）と、前記繊維ウェブに対してバインダーとなる水系接着剤を繊維ウェブにスプレー散布する工程（バインダースプレー工程）と、前記繊維ウェブの繊維相互間をバインダーによって結合する乾燥加熱工程（乾燥工程）とからなる、いわゆるエアレイ法が用いられる。
エアレイ法には、本州製紙法（キノクロス法）、カールクロイヤー法、ダンウェブ法、Ｊ＆Ｊ法、ＫＣ法、スコット法等が存在するが、この中でも本州製紙法が最も好適に用いられる。
The dry nonwoven fabric of the present invention comprises a step (formation step) of dry-disaggregating the above-mentioned raw fibers to form a fiber web, and a step of spraying an aqueous adhesive serving as a binder on the fiber web (binder) A so-called air array method is used, which includes a spraying step) and a drying heating step (drying step) in which the fibers of the fiber web are bonded together with a binder.
The airlaid method includes the Honshu paper manufacturing method (Kinocross method), the Karl Croyer method, the Dunweb method, the J & J method, the KC method, the Scott method, etc. Among them, the Honshu paper manufacturing method is most preferably used.
本発明の乾式不織布の製造工程において、前述のバインダースプレー工程において使用する可能な水系接着剤としては、カゼイン、アルギン酸ナトリウム、ヒドロキシエチルセルロース、カルボキシメチルセルロースナトリウム塩、ポリビニルアルコール（PVA）、ポリアクリル酸ソーダ等の水溶液タイプのバインダー、ポリアクリル酸エステル、アクリル・スチレン共重合体、ポリ酢酸ビニル、エチレン・酢酸ビニル共重合体、アクリルニトリル・ブタジエン共重合体、メチルメタアクリレート・ブタジエン共重合体等の各エマルジョン、スチレン・ブタジエン共重合体ラテックス等のエマルジョンタイプの水系接着剤が使用可能である。 In the production process of the dry nonwoven fabric of the present invention, examples of the aqueous adhesive that can be used in the binder spraying process include casein, sodium alginate, hydroxyethyl cellulose, carboxymethyl cellulose sodium salt, polyvinyl alcohol (PVA), sodium polyacrylate, and the like. Water-soluble binders, polyacrylates, acrylic / styrene copolymers, polyvinyl acetate, ethylene / vinyl acetate copolymers, acrylonitrile / butadiene copolymers, methyl methacrylate / butadiene copolymers, etc. An emulsion type water-based adhesive such as styrene / butadiene copolymer latex can be used.
本発明においては、前記水系接着剤に微細繊維状セルロースを混合して使用される。
微細繊維状セルロースは、セルロース繊維をさらに叩解処理やホモジナイズ処理、フィブリル化させることで得られる（特許文献４、５参照）。
本発明で使用する微細繊維状セルロースは、通常のパルプ繊維よりもはるかに幅の狭いセルロース繊維あるいは棒状粒子である。微細繊維状セルロース繊の幅は走査型または透過型電子顕微鏡で観察して、２〜１０００ｎｍが好ましい。より好ましくは２〜５００ｎｍであり、さらに好ましくは４〜１００ｎｍである。繊維の幅が２ｎｍ未満の場合には、セルロース分子として水に溶解するので、微細繊維の添加による不織布の剛性の向上効果が得られない。１０００ｎｍを超えると、水系接着剤と混合して、繊維ウェブ表面にスプレー塗工する際、少量を均一に混合することが困難となり、スプレー適性が低下する可能性がある。また、微細繊維化が不十分で、不織布の剛性の向上効果が得られない可能性がある。
In the present invention, the aqueous adhesive is used by mixing fine fibrous cellulose.
Fine fibrous cellulose can be obtained by further beating, homogenizing, or fibrillating cellulose fibers (see Patent Documents 4 and 5).
The fine fibrous cellulose used in the present invention is a cellulose fiber or rod-like particle that is much narrower than normal pulp fiber. The width of the fine fibrous cellulose fiber is preferably 2 to 1000 nm as observed with a scanning or transmission electron microscope. More preferably, it is 2-500 nm, More preferably, it is 4-100 nm. When the fiber width is less than 2 nm, it dissolves in water as cellulose molecules, so that the effect of improving the rigidity of the nonwoven fabric due to the addition of fine fibers cannot be obtained. When it exceeds 1000 nm, it becomes difficult to mix a small amount uniformly when mixed with a water-based adhesive and spray-coated on the surface of the fiber web, and the sprayability may be lowered. Moreover, fine fiberization is inadequate and the improvement effect of the rigidity of a nonwoven fabric may not be acquired.
本発明における微細繊維状セルロースの乾式不織布に対する添加率は、０．５〜２０質量％、好ましくは１〜１５質量％、より好ましくは２．５〜１０質量％である。繊維ウェブに対する添加率が少ないと、その添加による剛性向上効果が少ない。また、添加率が多すぎると、水系接着剤の乾燥が不十分となり、好ましくない。 The addition rate of the fine fibrous cellulose in the present invention to the dry nonwoven fabric is 0.5 to 20% by mass, preferably 1 to 15% by mass, more preferably 2.5 to 10% by mass. When the addition ratio to the fiber web is small, the effect of improving the rigidity due to the addition is small. Moreover, when there is too much addition rate, drying of an aqueous adhesive becomes inadequate and it is unpreferable.
また、本発明における微細繊維状セルロースの水系接着剤固形分に対する添加量は２〜１５質量％であることが望ましい。２％未満の場合は、剛性の向上効果が得られない。また、添加量が１５質量％を超えた場合には、水系接着剤の粘性が過大となり、スプレー塗布適性の低下という問題が生じるおそれがある。 Moreover, it is preferable that the addition amount with respect to the water-system adhesive solid content of the fine fibrous cellulose in this invention is 2-15 mass%. If it is less than 2%, the effect of improving rigidity cannot be obtained. On the other hand, when the addition amount exceeds 15% by mass, the viscosity of the water-based adhesive becomes excessive, which may cause a problem that the spray application suitability is lowered.
前記水系接着剤には、微細繊維状セルロース以外にも、必要に応じて、吸水促進剤、着色のための顔料や分散剤を添加しても良い。
吸水促進剤としては、ポリオキシエチレンアルキルエーテル、ソルビタン脂肪酸エステル、ショ糖脂肪酸エステル、ポリグリセリン脂肪酸エステル等の非イオン性界面活性剤、アルキルアミドベタイン等の両性界面活性剤、ポリオキシエチレンアルキルエーテル硫酸塩、スルホコハク酸塩等のアニオン性界面活性剤、及びこれらから任意に選択した混合物が挙げられる。このような吸水促進剤の添加量は必要とされる吸液量と乾式不織布から溶出分との関係より適宜選択する。
In addition to the fine fibrous cellulose, the water-based adhesive may contain a water absorption accelerator, a pigment for coloring, and a dispersant as necessary.
Examples of water absorption promoters include nonionic surfactants such as polyoxyethylene alkyl ether, sorbitan fatty acid ester, sucrose fatty acid ester, polyglycerin fatty acid ester, amphoteric surfactants such as alkylamide betaine, polyoxyethylene alkyl ether sulfate And anionic surfactants such as salts and sulfosuccinates, and mixtures arbitrarily selected from these. The amount of the water absorption accelerator added is appropriately selected from the relationship between the required amount of liquid absorption and the amount of elution from the dry nonwoven fabric.
本発明の乾式不織布の坪量は、４０〜１００g/m２の範囲が好ましく、さらに好ましくは５０〜８０g/m２である。４０g/m２未満の場合は、繊維量が少なく、均一な地合を得るのが困難であり、また剛性が低く、使い勝手が悪い。また、１００g/m２を超える場合は、ロールあたりの巻長が短くなり、トレイマット寸法への断裁加工の作業性が低下する。
また、本発明の乾式不織布の密度は、０．０２〜０．１２g/cm３の範囲が好ましく、さらに好ましくは０．０３〜０．１０g/cm３である。０．０２g/cm３未満の不織布の製造は実質的に困難である。また、０．１２g/cm３を超えると単位面積あたりの吸液量が低下するため好ましくない。
The basis weight of the dry nonwoven fabric of the present invention is preferably in the range of 40 to 100 g / m 2 , more preferably 50 to 80 g / m 2 . If it is less than 40 g / m 2 , the amount of fibers is small, it is difficult to obtain a uniform texture, the rigidity is low, and the usability is poor. Moreover, when it exceeds 100 g / m < 2 >, the winding length per roll will become short and the workability | operativity of the cutting process to a tray mat dimension will fall.
The density of the dry nonwoven fabric of the present invention is preferably in the range of 0.02 to 0.12 g / cm 3 , more preferably 0.03 to 0.10 g / cm 3 . The production of nonwoven fabrics of less than 0.02 g / cm 3 is substantially difficult. On the other hand, if it exceeds 0.12 g / cm 3 , the amount of liquid absorption per unit area decreases, which is not preferable.
本発明の乾式不織布は、その片面もしくは両面に、表面の平滑性を向上させ、かつ、剛性を向上させる目的で、繊維長１５ｍｍ〜５１ｍｍの比較的長めの繊維長を有する短繊維からなる表面繊維層を設けることが可能である。
前記表面繊維層は、片面あたり０．５〜４．０g/m２の範囲が好ましく、さらに好ましくは、１．０〜３．０g/m２である。表面繊維層が４．０g/m２以上になると、不織布の剛性は向上するものの、積層させるための装置能力によっては生産速度を低下させる。また、表面繊維総が０．５g/m２未満の場合には、積層による平滑性および剛性の向上効果が殆ど得られないので好ましくない。
The dry nonwoven fabric of the present invention is a surface fiber composed of short fibers having a relatively long fiber length of 15 mm to 51 mm for the purpose of improving the smoothness of the surface and improving the rigidity on one or both sides thereof. It is possible to provide a layer.
The surface fiber layer preferably has a range of 0.5 to 4.0 g / m 2 per side, and more preferably 1.0 to 3.0 g / m 2 . When the surface fiber layer is 4.0 g / m 2 or more, the rigidity of the nonwoven fabric is improved, but the production rate is lowered depending on the apparatus capability for laminating. Further, when the total surface fiber is less than 0.5 g / m 2 , the effect of improving the smoothness and rigidity by the lamination is hardly obtained, which is not preferable.
前記表面繊維層に用いる短繊維としては、レーヨン、コットン等のセルロース系繊維が水系接着剤による強度発現性という理由から望ましい。また、前記セルロース系繊維に、他の天然繊維、合繊繊維等の任意の繊維を混合して表面繊維層として使用することも可能である。 As the short fibers used in the surface fiber layer, cellulose fibers such as rayon and cotton are desirable because of the strength development by the aqueous adhesive. Moreover, it is also possible to mix arbitrary fibers, such as another natural fiber and synthetic fiber, with the said cellulosic fiber, and to use it as a surface fiber layer.
以下、本発明を実施例によって詳述する。
＜実施例１＞
本州製紙法のエアレイ法不織布マシンにより以下の通り乾式不織布を製造する。
走行するメッシュ状コンベア上に、レーヨン繊維（ダイワボウレーヨン ＣＤ１．７dtex×２９ｍｍ，表面繊維層１）、市販のＮＢＫＰパルプを乾式解繊装置で解繊して得たパルプ繊維（中間繊維層１）、表面繊維層１で使用したものと同じレーヨン繊維（表面繊維層２）を、この順で空気流と共に落下堆積させて繊維ウェブを形成させる。
該ウェブに、スチレン・ブタジエン共重合体（ＤＩＣ(株) ラックスターDS-233）固形分100部に対して、微細繊維状セルロース（ダイセル(株) セリッシュFD100G,繊維幅１０〜２００ｎｍの範囲）を５.３部の比率で添加し、混合して得た水系バインダー液を、固形分７．９g/m２となるようにエアナイフノズルにより散布した後、ボックス型熱風乾燥機（雰囲気温度170℃）の中を通過させ、ウェブ繊維相互間を結合させたのち、該ウェブを反転させ、最初にバインダー散布を施した面の反対面から前記と同様に、固形分７．９g/m２となるようにバインダー散布を施し、再度熱風乾燥機（雰囲気温度170℃）を通過させることによって、５０g/m２の乾式パルプ不織布を得た。
Hereinafter, the present invention will be described in detail by way of examples.
<Example 1>
A dry nonwoven fabric is manufactured as follows using an airlaid nonwoven fabric machine manufactured by Honshu Paper.
On the traveling mesh conveyor, rayon fibers (Daiwabow rayon CD1.7 dtex × 29 mm, surface fiber layer 1), pulp fibers obtained by defibrating commercially available NBKP pulp with a dry defibrating device (intermediate fiber layer 1), The same rayon fibers (surface fiber layer 2) as used in the surface fiber layer 1 are dropped and deposited together with an air flow in this order to form a fiber web.
On the web, fine fibrous cellulose (Daicel Corp. Celish FD100G, fiber width range of 10 to 200 nm) with respect to 100 parts of solid content of a styrene / butadiene copolymer (DIC Co., Ltd., Luck Star DS-233). An aqueous binder solution obtained by adding and mixing at a ratio of 5.3 parts was sprayed with an air knife nozzle so as to have a solid content of 7.9 g / m 2, and then a box type hot air dryer (atmosphere temperature 170 ° C.). After passing through the inside and bonding between the web fibers, the web is turned over so that the solid content becomes 7.9 g / m 2 from the side opposite to the side where the binder is first applied as described above. The binder was sprayed with binder and again passed through a hot air dryer (atmosphere temperature 170 ° C.) to obtain a dry pulp nonwoven fabric of 50 g / m 2 .
＜実施例２＞
スチレン・ブタジエン共重合体の固形分１００部に対する微細繊維状セルロースの添加比率を１０部（片面あたりの水系バインダー散布量を８．２５g/m２）とし、中間繊維層の付量を表１記載量とした以外は、実施例１と同様にして、５０g/m２の乾式不織布を得た。
<Example 2>
The addition ratio of fine fibrous cellulose to 100 parts of the solid content of the styrene / butadiene copolymer is 10 parts (the amount of water-based binder sprayed per side is 8.25 g / m 2 ), and the amount of the intermediate fiber layer is listed in Table 1. Except for the amount, a dry nonwoven fabric of 50 g / m 2 was obtained in the same manner as in Example 1.
＜比較例１＞
水系バインダーに微細繊維状セルロースを添加せず、バインダー固形分、中間繊維層の付量を表１記載量とした以外は、実施例１と同様にして、５０g/m２の乾式不織布を得た。
<Comparative Example 1>
A dry nonwoven fabric of 50 g / m 2 was obtained in the same manner as in Example 1 except that the fine fibrous cellulose was not added to the aqueous binder and the solid content of the binder and the amount of the intermediate fiber layer were changed to those shown in Table 1. .
＜比較例２＞
片面あたりの水系バインダーの固形分量を８．２５g/m２とし、中間繊維層の付量を表１記載量とした以外は、比較例１と同様にして、５０g/m２の乾式不織布を得た。
<Comparative example 2>
A 50 g / m 2 dry nonwoven fabric is obtained in the same manner as in Comparative Example 1 except that the solid content of the aqueous binder per side is 8.25 g / m 2 and the weight of the intermediate fiber layer is the amount shown in Table 1. It was.
［厚さの測定方法］
測定子面積５cm２、測定荷重７gf/cm２の厚さ計（株式会社テクロック 定圧厚さ測定器 ＰＧ−１６）で測定する。
[Thickness measurement method]
It is measured with a thickness meter (TECLOCK CO., LTD., Constant pressure thickness measuring instrument PG-16) having a probe area of 5 cm 2 and a measurement load of 7 gf / cm 2 .
［剛性の測定方法］
幅５０ｍｍ、流れ１５０ｍｍのサンプル片を、ハンドルオメーター（熊谷理機工業株式会社）で測定する。
[Measurement method of rigidity]
A sample piece having a width of 50 mm and a flow of 150 mm is measured with a handle ohmmeter (Kumaya Riki Kogyo Co., Ltd.).
[引張強度]
幅５０ｍｍ、流れ１５０ｍｍのサンプル片を、チャック間距離１００ｍｍ、引張速度２００ｍｍ／分で測定する。
[Tensile strength]
A sample piece having a width of 50 mm and a flow of 150 mm is measured at a distance between chucks of 100 mm and a tensile speed of 200 mm / min.
以上、実施例、比較例の結果を表１に示す。 The results of Examples and Comparative Examples are shown in Table 1 above.
実施例、比較例より、本発明の不織布の剛性が向上していることが判明した。 From the examples and comparative examples, it was found that the rigidity of the nonwoven fabric of the present invention was improved.
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