JP2009235627A - Heat expandable particle-containing bulky paper and method for producing the same - Google Patents
Heat expandable particle-containing bulky paper and method for producing the same Download PDFInfo
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本発明は、熱膨張性粒子含有嵩高紙及びその製造方法に関する。特に、紙おむつや生理処理用品の吸収性物品、保湿性食品容器等に用いる熱膨張性粒子含有嵩高紙に関する。 The present invention relates to a bulky paper containing thermally expandable particles and a method for producing the same. In particular, the present invention relates to a bulky paper containing thermally expandable particles used for absorbent articles for disposable diapers and sanitary products, moisturizing food containers and the like.
天然パルプ主体の繊維に発泡性粒子を混抄して得た湿式混抄シートを、乾燥工程において加熱乾燥と同時に発泡性粒子を膨張させることによって、密度０．１〜０．３ｇ／ｃｍ3の発泡性粒子均一混抄紙が得られることが知られている（特許文献１〜３）。更に、特許文献１〜３には、前記湿式混抄シートの加熱発泡前の含水率が、通常の紙の場合に比べて高い６５〜７２％の状態で加熱発泡すると、良好な発泡が得られ、低密度の紙が得られることが開示されている。 The natural pulp mainly wet混抄sheet a foamable particles obtained by混抄the fibers, by expanding the same time expandable particles heat drying and the drying step, foaming density 0.1 to 0.3 g / cm 3 It is known that uniform mixed paper is obtained (Patent Documents 1 to 3). Furthermore, in Patent Documents 1 to 3, when the water content before heating and foaming of the wet-mixed sheet is 65 to 72% higher than that in the case of normal paper, foaming is obtained, It is disclosed that low density paper can be obtained.
特許文献１〜３に開示されている熱膨張性粒子を含んだ湿式混抄シートは、熱膨張性粒子の膨張力によってシートの嵩高性が発現する。熱膨張性粒子は、ドライヤー等でシートを加熱することによって膨張させることができ、それと同時にシートは乾燥される。ここで、シートをドライヤー面に強く押し当てると、熱伝導性が高まり、乾燥や膨張の効率は良くなるが、一方で、押し当て力によって、嵩高性発現が抑制されてしまう。逆に、押し当て力を弱めると、嵩高性の発現の抑制は改善されるが、ドライヤーからシートへの熱伝導が低くなり、乾燥効率と熱膨張性粒子の膨張が十分でなくなる。また、押し当て力を弱めると、シートのドライヤー接触面と非接触面とで熱膨張性粒子にかかる温度に差が生じ、その結果、膨張の程度に差が生じてしまう。特許文献１〜３に開示されている方法では、乾燥前のシートの含水率を通常の紙の場合よりも高い含水率とすることで、上記のような膨張不良を改善しようとするものである。具体的には、前記湿式混抄シートの加熱膨張前の含水率が、通常の紙よりも高い６５〜７２％の状態で加熱膨張させると、より膨張しやすくなり低密度の紙が得られる。しかし、特許文献１〜３に開示されている方法は、上記の加熱・乾燥と発泡との間の問題を根本的に解消していない。また、加熱方法を熱ロール方式ではなく熱風加熱方法としても、上記の問題を解消することはできない。このように、従来の方法を用いれば、密度０．１〜０．３ｇ／ｃｍ3のシートを安定して得ることはできるが、それよりも低い密度、例えば０．０５ｇ／ｃｍ3以下の超低密度紙を安定的に製造することはできなかった。 The wet-mixed sheet containing thermally expandable particles disclosed in Patent Documents 1 to 3 exhibits the bulkiness of the sheet due to the expansion force of the thermally expandable particles. The thermally expandable particles can be expanded by heating the sheet with a dryer or the like, and at the same time, the sheet is dried. Here, when the sheet is strongly pressed against the dryer surface, the thermal conductivity is increased and the efficiency of drying and expansion is improved. On the other hand, the expression of bulkiness is suppressed by the pressing force. Conversely, when the pressing force is weakened, the suppression of the bulkiness is improved, but the heat conduction from the dryer to the sheet is lowered, and the drying efficiency and the expansion of the thermally expandable particles become insufficient. Further, when the pressing force is weakened, a difference is caused in the temperature applied to the thermally expandable particles between the dryer contact surface and the non-contact surface of the sheet, and as a result, a difference occurs in the degree of expansion. In the methods disclosed in Patent Documents 1 to 3, the moisture content of the sheet before drying is set to a higher moisture content than that of ordinary paper, thereby trying to improve the above-described expansion failure. . Specifically, when the wet mixed paper sheet is heated and expanded in a state where the moisture content before heating and expansion is 65 to 72% higher than that of normal paper, it becomes easier to expand and low density paper is obtained. However, the methods disclosed in Patent Documents 1 to 3 do not fundamentally solve the above problem between heating / drying and foaming. Further, the above problem cannot be solved even if the heating method is not a hot roll method but a hot air heating method. As described above, if a conventional method is used, a sheet having a density of 0.1 to 0.3 g / cm 3 can be stably obtained, but a density lower than that, for example, an ultra-low density of 0.05 g / cm 3 or less. Low density paper could not be produced stably.
本発明の方法は、繊維層に熱膨張性粒子を配合して抄造した湿式混抄シートを、加熱により膨張させて低密度の嵩高な紙を製造する方法において、前記湿式混抄シートを加熱膨張工程において乾燥させることなく加熱膨張させた後、乾燥工程において乾燥させることを特徴とする熱膨張性粒子含有嵩高紙の製造方法である。 The method of the present invention is a method for producing a low density and bulky paper by heating a wet mixed sheet made by mixing thermally expandable particles in a fiber layer and heating the wet mixed sheet in a heating and expanding step. A method for producing a bulky paper containing thermally expandable particles, wherein the paper is heated and expanded without drying, and then dried in a drying step.
本発明の好ましい態様においては、前記加熱膨張を、前記熱膨張性粒子の膨張開始温度以上の温度の湿熱空気又は水蒸気を前記湿式混抄シートに通過させることによって行うことを特徴とする。また、前記湿式混抄シートを支持体上に載せ、前記湿式混抄シートの上面側から前記湿熱空気又は水蒸気を吹き付けながら、下面側において前記湿熱空気又は水蒸気を吸引することで、前記湿熱空気又は水蒸気を前記湿式混抄シートに通過させることを特徴とする。また、前記熱膨張性粒子含有嵩高紙の密度が０．１ｇ／ｃｍ3未満であることを特徴とする。 In a preferred aspect of the present invention, the thermal expansion is performed by passing wet hot air or water vapor having a temperature equal to or higher than an expansion start temperature of the thermally expandable particles through the wet mixed sheet. The wet mixed sheet is placed on a support, and the wet hot air or water vapor is sucked on the lower surface side while blowing the wet hot air or water vapor from the upper surface side of the wet mixed sheet, whereby the wet hot air or water vapor is The wet mixed paper sheet is passed through. The density of the thermally expandable particle-containing bulky paper is less than 0.1 g / cm 3 .
本発明の熱膨張性粒子含有嵩高紙は、３０〜１００質量％の天然パルプと、０〜７０質量％の合成パルプ、有機繊維及び無機繊維からなる群から選ばれる繊維とからなる繊維層１００質量部当たり、膨張前の平均粒径が５〜３０μｍであって、加熱により体積が２０〜１２５倍に膨張する熱膨張性粒子１〜４０質量部を分散保持させた湿式混抄シートを、加熱膨張工程において乾燥させることなく加熱膨張させた後、乾燥工程において乾燥させることにより得られ、密度０．１ｇ／ｃｍ3未満であることを特徴とする。 The heat-expandable particle-containing bulk paper of the present invention has a fiber layer of 100 to 100% by mass consisting of 30 to 100% by mass of natural pulp and 0 to 70% by mass of synthetic pulp, organic fibers and inorganic fibers. A wet mixed sheet in which 1 to 40 parts by mass of thermally expandable particles having an average particle diameter before expansion of 5 to 30 μm per volume and expanded to a volume of 20 to 125 times by heating is dispersed and heated per part. It is obtained by heating and expanding without drying in a drying step and then drying in a drying step, and has a density of less than 0.1 g / cm 3 .
本発明では、熱膨張性粒子を混抄したシートの加熱膨張工程が乾燥工程と分離されている。加熱膨張工程では、所定温度の湿熱空気又は水蒸気で湿式混抄シートを乾燥しないように加熱した後、乾燥工程において膨張したシートを乾燥させる。これにより、混抄した熱膨張性粒子が十分に膨張することができ、低密度の紙が安定して得られる。特に、密度が０．１ｇ／ｃｍ3未満、好ましくは０．０５ｇ／ｃｍ3以下の超低密度紙を安定的に製造することができる。 In the present invention, the heating expansion process of the sheet mixed with the thermally expandable particles is separated from the drying process. In the heating and expanding step, the wet mixed paper sheet is heated so as not to dry with moist hot air or water vapor at a predetermined temperature, and then the sheet expanded in the drying step is dried. Thereby, the heat-expandable particle | grains mixed and mixed can fully expand | swell, and a low density paper is obtained stably. In particular, the density is less than 0.1 g / cm 3, preferably it is possible to stably produce 0.05 g / cm 3 or less of very low density paper.
本発明の嵩高紙は、０．１ｇ／ｃｍ3未満、好ましくは０．０５ｇ／ｃｍ3以下の密度を有する。同等レベルの低密度シートであって、その嵩高特性と保液特性から吸収性物品の吸収コアの材料としてよく利用されているエアレイドパルプ不織布等の低密度シートは、液拡散性が悪いという欠点と、湿潤加圧によって嵩がへたるという欠点を有している。一方、本発明の嵩高紙は、熱膨張性粒子の膨張によって嵩高性が発現しており、繊維部分は比較的高密度状態を維持し、空隙部分には膨張した熱膨張性粒子のバルーンが詰まっているという形態になっている。従って、嵩がへたらないだけでなく、加圧に対する反発弾性も有するため、紙おむつや生理処理用品等の吸収性物品の吸収コアに用いれば、よじれが少ない製品を実現することができる。上記特性を活かすことのできるその他の用途としては、切花梱包シート、荷造りクッションシート、紙ワイプス等が挙げられる。 Bulky paper of the present invention is less than 0.1 g / cm 3, preferably has a density of 0.05 g / cm 3 or less. The low density sheet of the same level, such as airlaid pulp nonwoven fabric, which is often used as a material for the absorbent core of absorbent articles due to its bulkiness and liquid retention characteristics, has the disadvantage of poor liquid diffusibility. In addition, there is a drawback that the bulk is reduced by wet pressurization. On the other hand, the bulky paper of the present invention exhibits bulkiness due to the expansion of the heat-expandable particles, the fiber portion maintains a relatively high density state, and the void portions are filled with balloons of expanded heat-expandable particles. It is in the form of being. Therefore, since it does not become bulky and also has rebound resilience against pressure, a product with little kinking can be realized if it is used as an absorbent core of absorbent articles such as disposable diapers and sanitary products. Other applications that can make use of the above characteristics include cut flower packing sheets, packing cushion sheets, paper wipes, and the like.
本発明で使用される繊維層は、３０〜１００質量％の天然パルプと、０〜７０質量％の合成パルプ、有機繊維及び無機繊維からなる群から選ばれる繊維とからなる。抄紙性の観点からすると、パルプを５０質量％以上配合した方がシートの地合、強度において優れている。天然パルプ、合成パルプ、有機繊維及び無機繊維は、通常の製紙で使用されるものの何れもが使用可能である。天然パルプとしては、例えば針葉樹や広葉樹の化学パルプや機械パルプ等の木材パルプ、古紙パルプ、麻や綿等の非木材天然パルプが挙げられるが、これらに限定されない。合成パルプとしては、ポリエチレン、ポリプロピレン等を原料とした合成パルプが挙げられるが、これらに限定されない。有機繊維としては、アクリル繊維、レーヨン繊維、フェノール繊維、ポリアミド繊維、ポリエチレン繊維が挙げられるが、これらに限定されない。無機繊維としては、ガラス繊維、炭素繊維、アルミナ繊維が挙げられるが、これらに限定されない。 The fiber layer used by this invention consists of 30-100 mass% natural pulp, and the fiber chosen from the group which consists of 0-70 mass% synthetic pulp, an organic fiber, and an inorganic fiber. From the viewpoint of papermaking properties, a blend of 50% by mass or more of pulp is superior in sheet formation and strength. Any of natural pulp, synthetic pulp, organic fiber, and inorganic fiber used in ordinary papermaking can be used. Examples of natural pulp include, but are not limited to, wood pulp such as chemical pulp and mechanical pulp of softwood and hardwood, non-wood natural pulp such as waste paper pulp, hemp and cotton. Synthetic pulp includes, but is not limited to, synthetic pulp made from polyethylene, polypropylene, or the like. Examples of organic fibers include, but are not limited to, acrylic fibers, rayon fibers, phenol fibers, polyamide fibers, and polyethylene fibers. Examples of inorganic fibers include, but are not limited to, glass fibers, carbon fibers, and alumina fibers.
本発明に使用する熱膨張性粒子は、マイクロカプセル内に低沸点溶剤を封入した熱膨張性マイクロカプセルである。このカプセルは、膨張前の平均粒径が５〜３０μｍ、好ましくは８〜１４μｍであり、８０〜２００℃の比較的低温度での短時間の加熱によって、体積が２０〜１２５倍、好ましくは５０〜８０倍に膨張する粒子である。低沸点溶剤としてはイソブタン、ペンタン、石油エーテル、ヘキサン、低沸点ハロゲン化炭化水素、メチルシラン等の揮発性有機溶剤（膨張剤）を塩化ビニリデン、アクリロニトリル、アクリル酸エステル、メタクリル酸エステル等の共重合体から成る熱可塑性樹脂で包み込んだものであり、マイクロカプセルの膜ポリマーの軟化点以上に加熱されると膜ポリマーが軟化しはじめ、同時に内包されている膨張剤の蒸気圧が上昇し、膜が押し広げられてカプセルが膨張する。熱膨張性マイクロカプセルは比較的低温、短時間で膨張して独立気泡を形成し、断熱性に優れた材を提供でき、また比較的扱い易いので、本用途には最適である。これら熱膨張性粒子として、マツモトマイクロスフェアーＦ−３６、同Ｆ−３０Ｄ、Ｆ−３０ＧＳ、Ｆ−２０Ｄ、Ｆ−５０Ｄ、Ｆ−８０Ｄ（松本油脂製薬（株）製）、エクスパンセルＷＵ、同ＤＵ（スウェーデン製、販売元日本フィライト（株））が知られているが、これらに限定されるわけではない。熱膨張性粒子の配合量は、パルプ繊維１００質量部に対して１〜４０質量部、好ましくは３〜２０質量部であり、１質量部以下では十分な膨張が得られず、４０質量部以上では経済性の面からあまり適当とはいえない。 The heat-expandable particles used in the present invention are heat-expandable microcapsules in which a low boiling point solvent is enclosed in the microcapsules. This capsule has an average particle size before expansion of 5 to 30 μm, preferably 8 to 14 μm, and a volume of 20 to 125 times, preferably 50, by heating for a short time at a relatively low temperature of 80 to 200 ° C. Particles that expand -80 times. Low-boiling solvents such as isobutane, pentane, petroleum ether, hexane, low-boiling halogenated hydrocarbons, methylsilane, and other volatile organic solvents (swelling agents) such as vinylidene chloride, acrylonitrile, acrylic esters, and methacrylic esters When heated above the softening point of the microcapsule membrane polymer, the membrane polymer begins to soften, and at the same time, the vapor pressure of the encapsulating expansion agent rises, pushing the membrane When spread, the capsule expands. Thermally expandable microcapsules are expanded in a short period of time at a relatively low temperature to form closed cells, can provide a material with excellent heat insulation properties, and are relatively easy to handle, so they are optimal for this application. As these thermally expandable particles, Matsumoto Microsphere F-36, F-30D, F-30GS, F-20D, F-50D, F-80D (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.), EXPANSEL WU, The DU (made in Sweden, distributor Nihon Philite Co., Ltd.) is known, but is not limited thereto. The compounding amount of the heat-expandable particles is 1 to 40 parts by mass, preferably 3 to 20 parts by mass with respect to 100 parts by mass of the pulp fiber, and sufficient expansion cannot be obtained at 1 part by mass or less, and 40 parts by mass or more. However, it is not very appropriate from the economic aspect.
パルプスラリーにはその他に、各種のアニオン性、ノニオン性、カチオン性あるいは両性の歩留まり向上剤、紙力増強剤、サイズ剤等が適宜選択して使用される。具体的には、紙力増強剤、歩留まり向上剤として、ポリアクリルアミド系のカチオン性、ノニオン性、アニオン性及び両性の樹脂、ポリエチレンイミン及びその誘導体、ポリエチレンオキサイド、ポリアミン、ポリアミド、ポリアミドポリアミン及びその誘導体、カチオン性及び両性澱粉、酸化澱粉、カルボキシメチル化澱粉、植物ガム、ポリビニルアルコール、尿素ホルマリン樹脂、メラミンホルマリン樹脂、親水性のポリマー粒子等の有機系化合物、及び硫酸バンド、アルミナゾル、塩基性硫酸アルミニウム、塩基性塩化アルミニウム、塩基性ポリ水酸化アルミニウム等のアルミ化合物、更に硫酸第一鉄、塩化第一鉄あるいはコロイダルシリカ、ベントナイト等の無機系化合物等を組み合わせて使用することができる。 In addition, various anionic, nonionic, cationic or amphoteric yield improvers, paper strength enhancers, sizing agents, and the like are appropriately selected and used for the pulp slurry. Specifically, polyacrylamide-based cationic, nonionic, anionic and amphoteric resins, polyethyleneimine and derivatives thereof, polyethylene oxide, polyamine, polyamide, polyamide polyamine and derivatives thereof as paper strength enhancers and yield improvers , Cationic and amphoteric starch, oxidized starch, carboxymethylated starch, plant gum, polyvinyl alcohol, urea formalin resin, melamine formalin resin, hydrophilic polymer particles and other organic compounds, and sulfate band, alumina sol, basic aluminum sulfate In addition, an aluminum compound such as basic aluminum chloride and basic polyaluminum hydroxide, and an inorganic compound such as ferrous sulfate, ferrous chloride, colloidal silica, and bentonite can be used in combination.
本発明の製造方法においては、まず、水中に所定の割合で配合されて得た原料スラリーを、抄紙工程のワイヤーパートでシート化した後、プレスパートで脱水する。一般的な抄紙工程においては、この脱水によって含水率は抄紙原料の６０質量％前後とされる。しかし、本発明の場合には、加熱膨張工程において、乾燥しないように湿熱空気又は水蒸気を用いてシート全体の温度を所定温度まで効率よく上げる必要があるため、できるだけ含水率が低い状態、例えば４０〜６０質量％に脱水される方が望ましい。しかしながら、高い含水率であっても熱効率の問題はあるが、出来上がりの状態に問題が生じることはない。次いで、脱水したシートを加熱膨張工程に送り、所定温度の湿熱空気又は水蒸気を用いて前記脱水シートを加熱し、熱膨張性粒子を膨張させる。この時、シートを支持体上に載せ、その上面側から前記湿熱空気又は水蒸気を吹きつけながら、支持体の下面側から吸引すると、シート全体が素早く且つムラなく加熱され、それによって加熱膨張効果が高まるため、最も効率の良い方法であるといえる。ここで、支持体としては、ネットなどの搬送ベルトが挙げられるが、これに限定されない。本発明では、湿熱空気又は水蒸気でシートを加熱することから、所定温度の範囲内であればたとえ過剰な熱量を与えてもシートが乾燥することはなく、熱膨張性粒子の膨張を阻害する繊維間結合力は発生しないため、熱膨張性粒子を十分膨張させることができる。次いで、加熱膨張処理を施した湿潤状態の膨張シートを乾燥工程へ送り乾燥させる。乾燥工程では、従来からの一般的な乾燥方法を用いることができる。ただし、強いプレスをかけてシートを潰たり、膨張した粒子を破壊するような高い温度をかけてはならない。 In the production method of the present invention, first, a raw slurry obtained by blending in water at a predetermined ratio is formed into a sheet by a wire part in a papermaking process, and then dehydrated by a press part. In a general papermaking process, the water content is about 60% by mass of the papermaking raw material by this dehydration. However, in the case of the present invention, since it is necessary to efficiently raise the temperature of the entire sheet to a predetermined temperature using wet hot air or water vapor so as not to be dried in the heating expansion step, the moisture content is as low as possible, for example, 40 It is desirable to dehydrate to ˜60 mass%. However, even with a high water content, there is a problem of thermal efficiency, but no problem arises in the finished state. Next, the dehydrated sheet is sent to the heating and expanding step, and the dehydrated sheet is heated using humid hot air or water vapor at a predetermined temperature to expand the thermally expandable particles. At this time, when the sheet is placed on the support and sucked from the lower surface side of the support body while blowing the moist hot air or water vapor from the upper surface side, the entire sheet is heated quickly and evenly, thereby providing a heating expansion effect. Because it increases, it can be said to be the most efficient method. Here, examples of the support include, but are not limited to, a transport belt such as a net. In the present invention, since the sheet is heated with moist hot air or water vapor, the sheet does not dry even if an excessive amount of heat is applied within a predetermined temperature range, and the fibers inhibit the expansion of the thermally expandable particles. Since no interstitial force is generated, the thermally expandable particles can be sufficiently expanded. Next, the wet expanded sheet that has been subjected to the heat expansion process is sent to the drying process and dried. In the drying step, a conventional general drying method can be used. However, do not apply high pressures that would apply a strong press to crush the sheet or destroy the expanded particles.
本発明の製造方法において用いる湿熱空気又は水蒸気の温度は、熱膨張性粒子のマイクロカプセル殻壁が軟化して膨張を開始する温度以上であれば良く、使用する熱膨張性粒子によって決められる。熱膨張工程において湿式混抄シートが乾燥しないようにするためには、相対湿度は１００％であることが望ましいが、必ずしも１００％である必要はない。湿熱空気又は水蒸気供給方法としては、ボイラから高温蒸気を取り出して直接シートに噴射する方法が最も望ましいが、乾燥装置からの湿排気を使うことも可能である。 The temperature of the moist hot air or water vapor used in the production method of the present invention may be at or above the temperature at which the microcapsule shell wall of the thermally expandable particles softens and starts to expand, and is determined by the thermally expandable particles used. In order to prevent the wet mixed paper sheet from drying in the thermal expansion process, the relative humidity is preferably 100%, but it is not necessarily 100%. As the wet hot air or water vapor supply method, the most preferable method is to take out the high temperature steam from the boiler and inject it directly onto the sheet, but it is also possible to use wet exhaust from the drying device.
実施例１
針葉樹晒クラフトパルプ８５質量部を水に分散させたパルプスラリーに、熱膨張性粒子として、マツモトマイクロスフィアーＦ−３６（松本油脂製薬（株）製、粒径５〜１５μｍ、膨張開始温度７５〜８５℃）１５質量部、熱膨張性粒子定着剤として、ファイレックスＲＣ−１０４（明成化学工業（株）製、カチオン変性アクリル系共重合体）０．２質量部及びファイレックスＭ（明成化学工業（株）製、アクリル系共重合体）０．２質量部を、よく撹拌しながら添加して、パルプ濃度１．０質量％の抄紙用原料とした。得られた抄紙用原料を用いて、常法に従って角型手抄きシートマシーン（８０メッシュ）により坪量５０ｇ／ｍ2の紙を抄紙し、ろ紙で挟んで脱水し、含水率６０質量％の湿式混抄シートを得た。その後、湿式混抄シートの下面から水を煮沸して得た水蒸気を直接当てて加熱膨張処理を行い、次いで、１００℃のロータリードライヤー（ジャポー（株）社製、速度０．５ｍ／分）に通して乾燥処理を行うことで、熱膨張性粒子含有嵩高紙を得た。その後、坪量、厚さ、密度を測定した。
Example 1
Matsumoto Microsphere F-36 (manufactured by Matsumoto Yushi Seiyaku Co., Ltd., particle size 5 to 15 μm, expansion start temperature 75 to a slurry obtained by dispersing 85 parts by mass of softwood bleached kraft pulp in water as thermally expandable particles. 85 ° C) 15 parts by mass, 0.2 parts by mass of Pyrex RC-104 (manufactured by Meisei Chemical Co., Ltd., cation-modified acrylic copolymer) and Pyrex M (Meisei Chemical Industry) 0.2 parts by mass of an acrylic copolymer (manufactured by Co., Ltd.) was added with good stirring to obtain a papermaking material having a pulp concentration of 1.0% by mass. Using the obtained papermaking raw material, a paper having a basis weight of 50 g / m 2 is made by a square hand-made sheet machine (80 mesh) according to a conventional method, dehydrated by being sandwiched between filter papers, and having a water content of 60% by mass. A wet mixed sheet was obtained. Then, the steam obtained by boiling water from the lower surface of the wet mixed paper sheet is directly applied to heat and expand, and then passed through a rotary dryer at 100 ° C. (manufactured by Japor Corporation, speed 0.5 m / min). The bulky paper containing thermally expandable particles was obtained by performing a drying process. Thereafter, the basis weight, thickness, and density were measured.
実施例２
ろ紙で挟んで脱水し、含水率４０質量％の湿式混抄シートとしたこと以外は、実施例１と同様に熱膨張性粒子含有嵩高紙を作製し、物性を測定した。
Example 2
A bulky paper containing thermally expandable particles was produced in the same manner as in Example 1 except that it was dehydrated by being sandwiched between filter papers to obtain a wet mixed paper sheet having a water content of 40% by mass, and physical properties were measured.
実施例３
ろ紙で挟んで脱水し、含水率８０質量％の湿式混抄シートとしたこと以外は、実施例１と同様に熱膨張性粒子含有嵩高紙を作製し、物性を測定した。
Example 3
A bulky paper containing thermally expandable particles was prepared and measured for physical properties in the same manner as in Example 1 except that it was dehydrated by being sandwiched between filter papers to obtain a wet mixed paper sheet having a water content of 80% by mass.
実施例４
針葉樹晒クラフトパルプを９０質量部、熱膨張性粒子を１０質量部としたこと以外は、実施例１と同様に熱膨張性粒子含有嵩高紙を作製し、物性を測定した。
Example 4
A bulky paper containing thermally expandable particles was prepared in the same manner as in Example 1 except that 90 parts by weight of the softwood bleached kraft pulp and 10 parts by weight of the thermally expandable particles, and the physical properties were measured.
実施例５
針葉樹晒クラフトパルプを９５質量部、熱膨張性粒子を５質量部としたこと以外は、実施例１と同様に熱膨張性粒子含有嵩高紙を作製し、物性を測定した。
Example 5
A bulky paper containing thermally expandable particles was prepared in the same manner as in Example 1 except that 95 parts by weight of the softwood bleached kraft pulp and 5 parts by weight of the thermally expandable particles, and the physical properties were measured.
比較例１
針葉樹晒クラフトパルプを１００質量部、熱膨張性粒子を０質量部としたこと以外は、実施例１と同様にシートを作製し、物性を測定した。
Comparative Example 1
A sheet was prepared in the same manner as in Example 1 except that 100 parts by mass of the softwood bleached kraft pulp and 0 part by mass of the thermally expandable particles were measured, and the physical properties were measured.
比較例２
手抄きして得た湿式混抄シートを、１００℃のロータリードライヤーで膨張させながら乾燥したこと以外は、実施例１と同様にシートを作製し、物性を測定した。
Comparative Example 2
A sheet was prepared in the same manner as in Example 1 except that the wet-mixed sheet obtained by hand-drawing was dried while being expanded with a rotary dryer at 100 ° C., and the physical properties were measured.
比較例３
ロータリードライヤーの温度を１３０℃にしたこと以外は、比較例２と同様にシートを作製し、物性を測定した。
Comparative Example 3
A sheet was prepared in the same manner as in Comparative Example 2 except that the temperature of the rotary dryer was 130 ° C., and the physical properties were measured.
比較例４
手抄きして得た湿式混抄シートの下面から１００℃の乾燥熱風を当てて膨張させたこと以外は、実施例１と同様にシートを作製し、物性を測定した。
Comparative Example 4
A sheet was prepared in the same manner as in Example 1 except that it was swollen by applying dry hot air of 100 ° C. from the lower surface of the wet-mixed sheet obtained by hand-drawing, and the physical properties were measured.
比較例５
乾燥熱風の温度を１３０℃にしたこと以外は、比較例４と同様にシートを作製し、物性を測定した。
Comparative Example 5
A sheet was prepared in the same manner as in Comparative Example 4 except that the temperature of the dry hot air was 130 ° C., and the physical properties were measured.
以上の結果を表１に示す。
表１から明らかなように、加熱膨張工程と乾燥工程を同時に実施する場合（比較例２〜５）には、膨張不良が生じ、得られるシートの密度は、０．０５ｇ／ｃｍ3を超えている。一方、湿熱空気又は水蒸気で湿式混抄シートを加熱した後、乾燥工程において膨張したシートを乾燥する場合（実施例１〜５）には、熱膨張性粒子の嵩高性の発現が十分に起こり、得られる熱膨張性粒子含有嵩高紙の密度はいずれも０．０５ｇ／ｃｍ3以下となっている。 As is apparent from Table 1, when the heating expansion process and the drying process are carried out simultaneously (Comparative Examples 2 to 5), expansion failure occurs, and the density of the obtained sheet exceeds 0.05 g / cm 3. Yes. On the other hand, when the wet mixed paper sheet is heated with moist hot air or water vapor and then the sheet expanded in the drying step is dried (Examples 1 to 5), the bulkiness of the thermally expandable particles sufficiently occurs, and The density of the heat-expandable particle-containing bulky paper is 0.05 g / cm 3 or less.
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