JP7320615B2 - 吸収性物品の流体管理層 - Google Patents
吸収性物品の流体管理層 Download PDFInfo
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- JP7320615B2 JP7320615B2 JP2021558627A JP2021558627A JP7320615B2 JP 7320615 B2 JP7320615 B2 JP 7320615B2 JP 2021558627 A JP2021558627 A JP 2021558627A JP 2021558627 A JP2021558627 A JP 2021558627A JP 7320615 B2 JP7320615 B2 JP 7320615B2
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- fluid management
- management layer
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Landscapes
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Dermatology (AREA)
- Manufacturing & Machinery (AREA)
- Absorbent Articles And Supports Therefor (AREA)
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Description
別の実行では、本開示の流体管理層は、複数の吸収性繊維、複数の剛化繊維、及び複数の弾性繊維を含む。流体管理層は、本開示の流体管理層中の吸収性繊維の、剛性繊維に対する重量パーセント比が、1:1未満、より好ましくは0.6:1未満、最も好ましくは0.5:1未満であり得、具体的にはこれらの範囲及びそれらによって作成される任意の範囲内の全ての値を列挙する。同様に、本開示の流体管理層中の吸収性繊維の、弾性繊維に対する重量パーセント比は、1:1未満、より好ましくは0.8:1未満、又は最も好ましくは0.7:1未満であり、具体的にはこれらの範囲及びそれらによって作成される任意の範囲内の全ての値を列挙する。
本開示の流体管理層の更なる利益は、染みマスキングであったことを想起されたい。表4に提供されるデータは、本開示の流体管理層の染みサイズの減少を示す。以下の染みサイズデータについて、列挙された試料の各々を、ミクロ孔及びマクロ孔を有する液圧成形フィルムであるトップシートを有する吸収性物品において利用した。フィルムは、Tredegar Corp.USAから現在入手可能である。これらの吸収性物品の各々は、パルプ繊維、吸収性ゲル化材料、及びビコ繊維を含むエアレイド吸収性コアであって、Glatfelter(York,PA,USA)から入手可能な163gsmの坪量を有する吸収性コアを有した。
再び図1A及び1Bを参照すると、前述のように、本開示の使い捨て吸収性物品は、トップシート20及びバックシート50を含むことができる。それらの間には、流体管理層30及び吸収性コア40を挟み込むことができる。更なる層を、トップシート20とバックシート50との間に位置付けてもよい。
繊維のデシテックス(Decitex、Dtex)
織物ウェブ(例えば、織布、不織布、エアレイド)は、材料の個別の繊維から構成されている。繊維を、デシテックス単位で報告された線質量密度を単位として測定する。デシテックス値は、10000メートルの繊維中に存在するその繊維の質量をグラム単位で表したものである。材料ウェブ中の繊維のデシテックス値は、多くの場合、仕様の一部として製造業者によって報告されている。繊維のデシテックス値が既知でない場合、走査電子顕微鏡法(scanning electron microscopy、SEM)などの好適な顕微鏡法によって繊維の断面積を測定し、FT-IR(Fourier Transform Infrared:フーリエ変換赤外線)分光法及び/又はDSC(Dynamic Scanning Calorimetry:動的走査熱量測定)などの好適な方法を用いて繊維の組成を決定した後、組成物の密度についての文献の値を用いて10000メートルの繊維中に存在する繊維の質量をグラム単位で計算することによって計算することができる。全ての試験を、23℃±2.0℃の温度及び50%±2%の相対湿度に維持された室内で実施し、試料を、試験前に少なくとも2時間、同じ環境条件下で調整する。
dk=10000 m×ak×ρk×10-6
式中、dkの単位は(計算された長さ10000メートル当たりの)グラム数であり、akの単位はμm2であり、ρkの単位はグラム/立方センチメートル(g/cm3)である。デシテックスは、繊維タイプ(例えば、PP、PET、セルロース、PP/PET2成分)と共に0.1g単位(計算された長さ10000メートル当たり)で報告する。
試験試料の坪量は、単一の材料層の単位面積(平方メートル単位)当たりの質量(グラム単位)であり、公定法WSP130.1に従って測定する。試験試料の塊を既知の面積に切断し、0.0001グラムの精度の分析天秤を用いて試料の質量を測定する。全ての測定を、23℃±2℃及び相対湿度50%±2%で維持された実験室で実施し、試験試料を、試験前に少なくとも2時間、この環境で調整する。
本明細書で提供される空気透過性の測定値を、Worldwide Strategic Partners(WSP)試験方法70.1を使用することによって得た。
試験片のキャリパ、又は厚さを、試料が上に載置される基準プラットフォームと、特定の時間にわたって試料に特定の量の圧力をかける押さえとの間の距離として測定する。全ての測定を、23℃±2℃及び相対湿度50%±2%で維持された実験室で実施し、試験片を、試験前に少なくとも2時間、この環境で調整する。
キャリパ係数は、前述したように、試料の坪量10gsm当たりのキャリパである。したがって、式はキャリパ/(坪量/10)である。
密度は、g/ccに到達するために適切な単位変換を用いて、坪量及びキャリパに基づいて計算する。
複数の繊維タイプの混合物を含む試験片の定量的化学組成を、ISO1833-1を使用して決定する。全ての測定を、23℃±2℃及び相対湿度50%±2%に維持された実験室内で実施する。
試験片のキャリパ、又は厚さは、試料が上に載置される基準プラットフォームと、特定の時間にわたって試料に特定の量の圧力をかける押さえとの間の距離として測定する。この方法では、一連の圧力を、間の回復期間を伴って、特定の時間にわたって試験片に適用する。全ての測定を、23℃±2℃及び相対湿度50%±2%で維持された実験室で実施し、試験片を、試験前に少なくとも2時間、この環境で調整する。
捕捉時間は、染み透りプレート及び電子回路インターバルタイマーを使用して、本明細書に記載されるように、人工月経液(Artificial Menstrual Fluid、AMF)が充填された吸収性物品について測定する。吸収性物品が一連の用量のAMFを捕捉するために必要とされる時間を記録する。捕捉試験の後、再湿潤試験を実施する。全ての測定を、23℃±2℃及び相対湿度50%±2%に維持された実験室内で実施する。
この方法は、吸収性物品上の視認可能な流体染みのサイズを測定する方法を記載する。この手順を、本明細書に記載されるように、別個の方法(例えば、反復捕捉法及び再湿潤法)に従って試験液体を投与された直後の試験試料において実施する。その結果得られる試験試料を、制御条件下で撮影する。次いで、各写真画像を画像分析ソフトウェアを使用して分析して、その結果得られる視認可能な染みのサイズの測定値を得る。全ての測定を、一定温度(23℃±2℃)及び相対湿度(50%±2%)で実施する。
人工月経液(AMF)は、脱線維ヒツジ血液、リン酸緩衝生理食塩水、及び粘液成分の混合物から構成される。AMFを、23℃で7.15~8.65センチストークスの粘度を有するように調製する。
本明細書で提供されるMD曲げ長さの測定値を、Worldwide Strategic Partners(WSP)試験法90.1を使用することによって得た。
Claims (16)
- 40グラム/平方メートル(gsm)~75gsmの坪量を有する、一体化され、カード処理された不織布を含む流体管理層であって、前記流体管理層が、材料の組成分析によって決定される場合、15重量パーセント~60重量パーセントの複数の吸収性繊維、2成分繊維を含む15重量パーセント~60重量パーセントの複数の剛化繊維、及び20重量パーセント~70重量パーセントの複数の弾性繊維を含み、前記流体管理層が、圧縮キャリパ法によって決定される場合、0.40mm超の全圧縮を呈し、かつ少なくとも0.35mmの全回復を有し、前記流体管理層が、密度法によって決定される場合、0.08g/cc以下の密度を有する、流体管理層。
- 前記流体管理層が、0.40mm~0.70mmの全圧縮を呈する、請求項1に記載の流体管理層。
- 前記流体管理層が、0.35~0.70mmの全回復を有する、請求項1又は2に記載の流体管理層。
- 前記流体管理層が、坪量法によって決定される場合、45gsm~60gsmの坪量を有する、請求項1~3のいずれか一項に記載の流体管理層。
- 前記流体管理層が、0.5kPa~1kPaで測定される場合、最終キャリパとして、少なくとも0.13mmのキャリパ減少を呈する、請求項1~4のいずれか一項に記載の流体管理層。
- 前記流体管理層が、0.5kPa~1kPaで測定される場合、最終キャリパとして、0.13mm~0.30mmのキャリパ減少を呈する、請求項5に記載の流体管理層。
- 前記流体管理層が、0.5kPa~2kPaで測定される場合、最終キャリパとして、少なくとも0.20mmのキャリパ減少を呈する、請求項1~6のいずれか一項に記載の流体管理層。
- 前記流体管理層が、0.5kPa~2kPaで測定される場合、最終キャリパとして、0.20mm~0.50mmのキャリパ減少を呈する、請求項1~7のいずれか一項に記載の流体管理層。
- 前記流体管理層が、0.5kPa~3kPaで測定される最終キャリパとして、少なくとも0.25mmのキャリパ減少を呈する、請求項1~8のいずれか一項に記載の流体管理層。
- 前記流体管理層が、0.5kPa~3kPaで測定される場合、最終キャリパとして、0.25mm~0.60mmのキャリパ減少を呈する、請求項9に記載の流体管理層。
- 前記流体管理層が、50gsm~60gsmの坪量を有し、前記不織布が、0.020g/cc~0.080g/ccの密度を有する、請求項1~10のいずれか一項に記載の流体管理層。
- 前記流体管理層が、空気透過性法を介して測定される場合、200m^3/m^2/分~400m^3/m^2/分の空気透過性を有する、請求項11に記載の流体管理層。
- トップシート、バックシート、前記トップシートと前記バックシートとの間に配置された吸収性コア、及び前記トップシートと前記バックシートとの間に配置された請求項1~12のいずれか一項に記載の流体管理層を備える、使い捨て吸収性物品。
- 前記流体管理層が、前記吸収性コアと前記トップシートとの間に配置される、請求項13に記載の使い捨て吸収性物品。
- 前記使い捨て吸収性物品が、染みサイズ測定法を介して測定される場合、50cm^2未満、47cm^2未満の染みサイズを呈する、請求項14に記載の使い捨て吸収性物品。
- 本開示の前記吸収性物品に呈される前記染みサイズが、30cm^2~50cm^2であり得る、請求項15に記載の使い捨て吸収性物品。
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