JP6985303B2 - ミクロフィブリル化フィルム - Google Patents
ミクロフィブリル化フィルム Download PDFInfo
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- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
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- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/22—Polyalkenes, e.g. polystyrene
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- D21H19/00—Coated paper; Coating material
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- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
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- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
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- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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Description
フィルムを製造する方法であって、
少なくとも50重量%の量の、第1のミクロフィブリル化セルロース(MFC)、少なくとも5重量%の量の強化繊維(ここで全てのパーセンテージが前記懸濁液の総固形分に基づいて計算されている)、及び形成助剤を含む懸濁液を提供する工程、
前記懸濁液を混合して混合物を形成する工程、
前記混合物から繊維状ウェブを形成する工程、
前記繊維状ウェブを脱水して、40g/m2未満の坪量、0.45g0.5/m未満の比形成数、及び、ASTM D 3985−05に準拠して50%の相対湿度で測定するときの24時間あたり100ml/m2未満、好ましくは24時間あたり50ml/m2未満の酸素透過率(OTR)値を有するフィルムを形成する工程を含む、上記方法。
少なくとも50重量%の量の第1のミクロフィブリル化セルロース(MFC)、
少なくとも5重量%の量の0.8mmを超える長さを有する強化繊維、
形成助剤
を含む、繊維ベース酸素バリアフィルムであって、
前記フィルムが、40g/m2未満の坪量、0.45g0.5/m未満の比形成数(specific formation number)、及びASTM D 3985−05に準拠して23℃、50%の相対湿度で測定するときの24時間あたり100ml/m2未満、好ましくは24時間あたり50ml/m2未満、又はさらに24時間あたり25ml/m2未満の酸素透過率(OTR)値を示す、上記繊維ベース酸素バリアフィルム。
繊維ベース酸素バリアフィルムであって、
少なくとも50重量%の量のミクロフィブリル化セルロース(MFC)、
少なくとも5重量%の量の0.8mmを超える長さを有する強化繊維、好ましくは硬材繊維からの強化繊維、及び
形成助剤を含む第1の層、ならびに
ポリオレフィン、好ましくはポリエチレンを含む第2の層を含み、
前記フィルムが、40g/m2未満の坪量、及び23℃、50%の相対湿度での24時間あたり10ml/m2未満、好ましくは23℃、50%の相対湿度での24時間あたり5ml/m2未満の酸素透過率(OTR)値を示す、上記繊維ベース酸素バリアフィルム。
ミクロフィブリル化セルロース(MFC)は、本特許出願の文脈においては、100nm未満の少なくとも1つの寸法を有するナノスケールのセルロース粒子繊維又はフィブリルを意味するものとする。MFCは、部分的又は全体的にフィブリル化されたセルロース又はリグノセルロース繊維を含む。遊離されたフィブリルは、100nm未満の直径を有するが、実際のフィブリル直径又は粒子サイズ分布及び/又はアスペクト比(長さ/幅)は供給源及び製造方法に依存する。最小のフィブリルは、基本フィブリル(elementary fibril)と呼ばれ、約2〜4nmの直径を有する(例えば、以下を参照:Chinga-Carrasco, G., Cellulose fibres, nanofibrils and microfibrils,: The morphological sequence of MFC components from a plant physiology and fibre technology point of view(セルロース繊維、ナノフィブリル及びミクロフィブリル:植物の生理機能及び繊維技術の観点からのMFC成分の形態学的シーケンス), Nanoscale research letters 2011, 6:417)。一方、ミクロフィブリルとしても定義される基本フィブリルの凝集形態(Fengel, D., Ultrastructural behavior of cell wall polysaccharides(細胞壁多糖類の超微細構造挙動), Tappi J., March 1970, Vol 53, No.3参照)が、例えば拡張精製プロセス又は圧力降下崩壊プロセスを使用することによってMFCを製造する際に得られる主生成物であることは、一般的に知られている。供給源及び製造方法に応じて、フィブリルの長さは、約1から10マイクロメートル超まで変化し得る。粗いMFCグレードは、かなりの割合のフィブリル化繊維、すなわち、仮道管(tracheid)から突起を有するフィブリル(セルロース繊維)を含んでおり、ある程度の量の仮道管から遊離したフィブリル(セルロース繊維)を伴うかもしれない。
この試験の目的は、MFCウェブの脱水及び走行性ならびに得られた製品の特性、特にバリア性に対して、長繊維及び改善された形成(形成助剤の添加及び混合による)が及ぼす影響を明らかにすることであった。MFCに加えて、湿潤末端デンプン(4kg/t)、ガラクトマンナン(1kg/t)、シリカ(5kg/t)、及び湿潤強度化学物質(5kg/t)を含む保持システムを使用した。さらに、疎水性サイジング剤AKD(1.5kg/t)を湿潤末端内に適用した。試験点P11_1を、繊維源として100%MFCを含有する基準とした。
15〜50重量%の硬材繊維を含有するMFCフィルム(P11_1〜P11_4)及び15重量%の軟材繊維を含有するMFCフィルム(P11_5)を、25g/m2のLDPE又は25g/m2のHDPE/LDPE共押出によりPE押出コーティングした。
Claims (20)
- 繊維状酸素バリアフィルムを製造する方法であって、
i.少なくとも50重量%の量の、第1のミクロフィブリル化セルロース(MFC)、
ii.少なくとも5重量%の量の、>0.8mmの加重繊維長を有する強化繊維、
iii.形成助剤を含む懸濁液、
を提供する工程であって、ここで全てのパーセンテージが前記懸濁液の総固形分に基づいて計算されている工程、
前記懸濁液を混合して混合物を形成する工程、
前記混合物から繊維状ウェブを形成する工程、
前記繊維状ウェブを脱水及び/又は乾燥して、40g/m2未満の坪量、0.45g0.5/m未満の比形成数、及び、ASTM D 3985−05に準拠して50%の相対湿度で測定するときの50%相対湿度での24時間あたり100ml/m2未満の酸素透過率(OTR)値を有するフィルムを形成する工程、
を含み、
前記形成助剤は、アニオン性高分子電解質及び第1のMFCよりも高いSR値を有する第2のより微細なMFCからなる群から選択される、
上記方法。 - 第1のMFCが、少なくとも85、好ましくは少なくとも90のSR値を示す、請求項1に記載の方法。
- MFCが、軟材繊維、好ましくはマツ繊維から形成されている、請求項1又は2に記載の方法。
- 強化繊維が、50未満、好ましくは40未満のSR値を示す、請求項1〜3のいずれかに記載の方法。
- 強化繊維が硬材クラフト繊維である、請求項1〜4のいずれかに記載の方法。
- 形成助剤及び前記強化繊維を第1のMFCと混合する前に、前記形成助剤を前記強化繊維に加える、請求項1〜5のいずれかに記載の方法。
- 形成助剤が、前記第1のMFCへ、その形成時に添加される、請求項1〜6のいずれかに記載の方法。
- 強化繊維が、前記懸濁液に添加される前に機械的に処理されている、請求項1〜7のいずれかに記載の方法。
- 強化繊維が、前記懸濁液に添加される前に化学処理されている、請求項1〜8のいずれかに記載の方法。
- 強化繊維が未乾燥繊維である、請求項1〜9のいずれかに記載の方法。
- 形成助剤がAPAMであり、このAPAMが、ウェブ1メトリックトンあたり0.1〜5kg、好ましくは0.1〜1kgの範囲内のウェブ中のAPAM含有量を生じる量で懸濁液中に存在する、請求項1に記載の方法。
- 前記形成助剤が第2のより微細なMFCであり、この第2のより微細なMFCが、ウェブ1メトリックトンあたり20〜100kg、好ましくは30〜80kgの範囲内のウェブ中の第2のより微細なMFC含有量を生じる量で懸濁液中に存在する、請求項1に記載の方法。
- 第2のより微細なMFCが、前記第1のMFCよりも高いSR値及び/又は粘度を有する、請求項12に記載の方法。
- 第1のMFCが4000cP未満の粘度を有し、前記第2のMFCが4000cP超の粘度を有する、請求項12又は13に記載の方法。
- 第2のより微細なMFCの繊維が、前記第1のMFCよりも小さい加重平均長を有する、請求項12〜14のいずれかに記載の方法。
- 懸濁液混合物を多孔質ワイヤ上に適用することによってウェブを形成する工程、前記ウェブを脱水する工程、前記ウェブを乾燥する工程、及び前記ウェブをカレンダー加工して前記フィルムを形成する工程をさらに含む、請求項1〜15のいずれかに記載の方法。
- 形成されたフィルム上にポリマー層、好ましくはポリエチレン層を適用する工程をさらに含む、請求項1〜16のいずれかに記載の方法。
- 少なくとも50重量%の量の第1のミクロフィブリル化セルロース(MFC)、
少なくとも5重量%の量の0.8mmを超える長さを有する強化繊維、
形成助剤
を含む、第1の層を少なくとも含む繊維ベース酸素バリアフィルムであって、
前記フィルムが、40g/m2未満の坪量、0.45g0.5/m未満の比形成数、及びASTM D 3985−05に準拠して50%の相対湿度で測定するときの50%相対湿度での24時間あたり100ml/m2未満の酸素透過率(OTR)値を示し、
前記形成助剤は、アニオン性高分子電解質及び第1のMFCよりも高いSR値を有する第2のより微細なMFCからなる群から選択される、
上記酸素バリアフィルム。 - ポリオレフィン、好ましくはポリエチレンを含む第2の層をさらに含む、請求18に記載の繊維ベース酸素バリアフィルム。
- 食品又は液体包装用途における請求項18又は19に記載のフィルムの使用。
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