JP2021526062A - ビーム型弾性体及び成形不織布層を有する伸縮性積層体 - Google Patents
ビーム型弾性体及び成形不織布層を有する伸縮性積層体 Download PDFInfo
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- JP2021526062A JP2021526062A JP2020568767A JP2020568767A JP2021526062A JP 2021526062 A JP2021526062 A JP 2021526062A JP 2020568767 A JP2020568767 A JP 2020568767A JP 2020568767 A JP2020568767 A JP 2020568767A JP 2021526062 A JP2021526062 A JP 2021526062A
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Abstract
Description
部分的又は全体的に繊維及び/又はフィラメントから形成された不織布ウェブ材料に関して、「結合部」とは、材料に塗布された接着剤の堆積、材料に加熱エネルギーを局所的に加えることによる熱融着(例えば、加熱された結合ローラー上の既定の結合用突出部からの熱、又は規定の結合用突出部を備えた結合ローラーと組み合わされたソノトロードからの超音波振動エネルギー)、又はz方向に圧力を(例えば、規定の結合用突出部を備えた結合ローラーによって)材料に局所的に加えることによって発生する塑性変形及び絡み合い若しくは噛み合い、のうちの1つ又はそれらの組合せによって生じる、複数の繊維及び/又はフィラメントが単一の塊として互いに保持される材料内の3次元ボリューム又は形状である。結合部は、ウェブ材料の大きな表面、並びにz方向寸法によって近似される、x−y平面に沿った二次元プロファイルを有する。結合部が、規定の結合用突出部を有する結合ローラーの使用によって形成されるとき、結合部の二次元プロファイルは、結合用突出部の形状をほぼ反映したものとなる。
本明細書で企図される着用可能物品は、伸縮性積層体の一部分又は区分を含んだ任意の着用可能物品を含む。伸縮性積層体とは、不織布ウェブ材料などのウェブ材料の1つ以上の比較的より低弾性又は比較的非弾性の層と共に積層された、ストリップ、ストランド、又はフィルム/シートの形態をなす弾性/エラストマー材料の組み合わせである。典型的な伸縮性積層体は、間に弾性材料が挟まれた及び積層された、2層の比較的非弾性の不織布ウェブ材料を含んでもよい。いくつかの実施例では、伸縮性積層体は、弾性材料が、他の層との積層中に機械/伸縮方向に歪みを受けるプロセスで製造される。製造が完了すると、弾性材料の弾性収縮により、他の層が機械/伸縮方向に沿ってギャザリングしてラッフルをなす。ギャザリングされた材料を有する積層体は、装着の容易さ、ガスケッティング、確実でかつ快適なフィット性、及び着用者の快適感などの目的のために、弾性伸縮及び収縮が望ましくあり得る着用可能物品の様々な構成要素を形成するのに有用である。
成形不織布ウェブ材料は、例えば、米国特許出願公開第2017/0191198号、同第2017/0029994号、同第2017/0029993号及び同第2017/0027774号、並びに米国特許出願第15/840,455号、同第15/879,474号、同第15/879,477号、同第15/881,910号、同第62/527,216号、及び同第62/527,224号のいずれかに記載されている装置、プロセス及び材料を使用して製造され得る。
RC(O)NHCH2CH2NHC(O)R
式中、それぞれのRは、独立して、7〜26個の炭素原子、好ましくは、10〜22個の炭素原子を有する飽和又は不飽和アルキル基である。この構造による化合物としては、例えば、ステアルアミドエチルステアルアミド、ステアルアミドエチルパルミトアミド、パルミトアミドエチルステアルアミド、エチレンビスステアルアミド、エチレンビスオレアミド、ステアリルエルカミド、エルカミドエチルエルカミド、オレアミドエチルオレアミド、エルカミドエチルオレアミド、オレアミドエチルエルカミド、ステアルアミドエチルエルカミド、エルカミドエチルパルミトアミド、パルミトアミドエチルオレアミド、及びこれらの混合物が挙げられる。
上述のような成形不織布ウェブ材料のサンドイッチ層を有する伸縮性積層体は、任意の好適な形態の弾性材料630を含み得る。例えば、弾性材料630は、伸縮方向と実質的に整列された弾性フィルム、弾性スクリム材料、又は複数の実質的に平行な離間した弾性ストランドであってもよい。いくつかの実施例では、弾性材料630は、470〜940のデシテックスを有し、約4mm〜約10mm(中心間)以上の長手方向(横断方向、又は横断伸縮方向)間隔を有し、150%より大きい(典型的にはそれよりも相当に大きい)製造予歪みを有する、伸縮方向と平行かつ実質的に整列して配列された複数の弾性ストランドであってもよい。
ビーム型弾性体は、スパンデックス繊維を含んでもよい。1つのタイプのスパンデックス繊維は、「ポリウレタン尿素」エラストマー又は「高ハードセグメントレベルポリウレタン」エラストマーであり、溶液(溶媒)紡糸プロセスを使用して繊維に形成しなければならない(溶融状態で処理可能でない)。ポリウレタン尿素における尿素結合は、夜間を含むおむつの着用に対応する時間尺度において体温付近の温度で良好な応力緩和性能を可能にする「固着」を提供するのに重要な強い化学相互作用を提供する。このタイプの固着は、多くの熱可塑性ポリウレタン(200℃を下回るとハードセグメント溶融を伴うポリウレタン)又は熱可塑性スチレンブロックコポリマーに比べて、より良好な力の緩和を可能にする(すなわち、伸張された状態で体温で保持されたとき、経時的な力の減衰がほとんどない)。
実施例1は、ベルト付きパンツ吸収性物品である。パンツは、前側腰部領域と後側腰部領域の両方に配置されたベルト積層体を備え、以下の材料及び構造を備える。
一般的な試験片調製
一般的な試験片調製は、方法自体内に特定の試験片調製指示を有さない方法に使用されることを意図している。
認定されたNIST定規に対して較正された0.5mm単位まで正確な定規を使用して、あるセクション内の2つの遠位のストランドの間の距離を0.5mm単位で測定し、次いでそのセクション内のストランドの数−1で割る。
平均ストランド間隔=d/(n−1)(式中、n>1)
0.1mm単位で報告する。
平均デシテックス法を使用して、完全な物品中に又は物品から抽出された対象の試料中に存在する弾性ストランドについての平均Dtexを、長さ加重ベースで計算する。デシテックス値は、弛緩状態のその材料10,000メートル中に存在するストランドの、グラム単位の質量である。弾性ストランド又は弾性ストランドを含有する弾性積層体のデシテックス値は、弾性ストランド又は弾性ストランドを含む弾性積層体の仕様の一部として製造業者によって報告されることが多い。平均Dtexは、入手可能であればこれらの仕様から計算することができる。あるいは、これらの指定される値が知られていない場合は、個々の弾性ストランドのデシテックス値は、走査電子顕微鏡(scanning electron microscopy、SEM)などの好適な顕微鏡技法を介して弛緩状態のストランドの断面積を決定し、フーリエ変換赤外(Fourier Transform Infrared、FT−IR)分光法を介してストランドの組成を決定し、次いで組成物の密度に関する文献値を使用して、10,000メートルのストランド中に存在するストランドのグラム単位の質量を計算することによって、測定される。製造業者が提供する又は実験によって測定される、完全な物品又は物品から抽出された試料から取り外された個々の弾性ストランドについてのデシテックス値を、後述の式において使用し、この式において、存在する弾性ストランド間のデシテックス値の長さ加重平均が決定される。
吸収性物品又は吸収性物品から抽出された試料中に存在する、弛緩長さLi及びストランドデシテックス値di(製造者の仕様から取得するか実験によって測定するかのいずれか)である個々の弾性ストランドfiの各々について、その吸収性物品又は吸収性物品から抽出された試料の平均Dtexは、以下のように定義される:
上記の手順に従って吸収性物品又は吸収性物品から抽出された試料から取り出された弾性ストランドのそれぞれについて、各弾性ストランドLkの弛緩状態の長さを測定し、ミリメートル(mm)で最も近いmmまで記録する。各弾性ストランドは、その組成を決定するために、FT−IR分光法を介して分析され、その密度ρkは利用可能な文献値から決定される。最後に、各ストランドをSEMによって分析する。ストランドを、鋭い刃を用いてその長さに沿って垂直に3つのほぼ等しい位置で切断して、SEM分析のためのきれいな断面を作り出す。これらの断面が露出した3つのストランド切片を、SEM試験片ホルダー上に弛緩状態で装着し、金でスパッタコーティングし、SEM内に導入して分析し、ストランド断面を明確に解明するのに十分な解像度で撮像する。測定された断面における何らかの斜めの歪みを最小限にするために、ストランド断面を検出器に対して可能な限り垂直に向ける。ストランド断面の形状は様々であり得、ストランドによっては複数の個々のフィラメントから成るものもあり得る。いずれにせよ、3つのストランド断面の各々の面積が(例えば、円形ストランドの直径、楕円形ストランドの長軸及び短軸、及びより複雑な形状の画像分析を使用して)決定され、弾性ストランドの3つの面積akの平均が、平方マイクロメートル(μm2)を単位として、0.1μm2単位で記録される。測定されたk番目の弾性ストランドのデシテックスdkは以下によって計算される:
dk=10000m×ak×ρk×10−6
式中、dkの単位は(計算された10,000メートル長さ当たりの)グラムであり、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。分析された任意の弾性ストランドについて、実験によって決定されたLk値及びdk値は、後から上記の平均Dtexに関する式において使用される。
表面トポグラフィー法では、吸収性物品から弾性積層体試料を取り出し、これを透明な水平円筒管セグメントの凸面にわたって接触させて延ばし、光学プロフィロメトリーを使用して、この透明な管セグメントを通して測定される積層体の着用者に面する側の面状表面トポロジーを測定する。次いで、3D表面データをサンプリングし、処理して、弾性積層体試料表面のパーセント接触面積及び高さ、並びにその関連するしわの頻度及び波長を記述する、いくつかのパラメータを抽出する。全ての試験片調製及び試験は、約23±2℃及び約50±2%の相対湿度に維持した調整した室内で実施し、試験に先立って少なくとも24時間、試験片をこの環境内で平衡化させる。
物品から抽出された各弾性積層体試料を、以下に記載するように水平管セグメント上に装着する。管セグメントは、8.0インチ(203mm)の外径及び0.1875インチ(4.76mm)の壁厚さを有する、十分な長さの光学的に透明な無色のキャストアクリル円筒管から切断される。このセグメントは、親管の円筒中心軸線と平行な軸線に沿った4.0インチ(102mm)の寸法と、5.5インチ(140mm)の円周外弧長さと、を有する。
DLPベースの構造光3D表面トポグラフィー測定システムを使用して、伸長させた弾性積層体試料の着用者に面する表面の三次元(3D)表面トポグラフィー画像を取得する(好適な表面トポグラフィー測定システムは、LMI Technologies Inc.(Vancouver,Canada)から市販されている、MikroCAD Premiumの計器、又は同等のものである)。このシステムは、以下の主要部品を含む:a)直接デジタル制御マイクロミラーを備えるデジタル光処理(Digital Light Processing、DLP)投影装置、b)少なくとも1600×1200ピクセルの解像度を有するCCDカメラ、c)少なくとも60mm×45mmの測定エリアに適合された投影光学系、d)60mm×45mmの測定エリアに適合された記録光学系、e)小さな硬石プレートに基づく三脚台、f)青色LED光源、g)測定、制御、及び評価コンピュータ実行表面テクスチャ分析ソフトウェア(好適なソフトウェアは、Mountain Map技術を備えたMikroCADソフトウェア、又は同等のものである)、並びに、h)供給メーカーから入手可能な、横方向(XY)較正及び垂直方向(Z)較正用の較正プレート。
3D表面トポグラフィー画像を、表面テクスチャ分析ソフトウェアで開く。次いで、各画像に対して以下のフィルタリング手順を実施する:1)無効な又は未測定の点の除去、2)ノイズを除去するための5×5ピクセルメジアンフィルタ、3)表面を平滑化するための5×5ピクセル平均フィルタ、及び、4)2次元の二次多項式(表面トポロジー画像の最小二乗適合を介して決定される)を減算して、一般的な形態を除去し、表面を平坦化する。二次多項式は以下の等式によって定義される:
f(x,y)=c1+c2x+c3y+c4x2+c5y2+c6xy
この時点までに上記したように処理された各データセットは、「前処理された試料データセット」と称される。得られるトポロジー画像の最も高い点は管セグメントの凸状表面と接触するエリアに対応し、最も低い点は管セグメントの凸状表面よりも下の最も遠位の点である。
5つの複製試料の3D表面トポグラフィー画像の各々について、前処理された試料データセットに対して以下の分析を行う。パーセント表面接触面積及び2〜98%高さの測定値は、表面に対して外挿される、ISO13565−2:1996規格に記載されている面積式実体比(Areal Material Ratio)(アボット−ファイアストーン)曲線から導出される。この曲線は、測定した表面高さの範囲に対する表面高さ分布ヒストグラムの積算曲線である。実体比は、評価領域(視野面積)の断面積に対する、所与の高さ又は切断深さにある表面を通過する交差平面以上の高さを有する点に相当する面積の、パーセントとして表される比である。2%の実体比における高さを、最初に特定する。次いで、この高さより100μm下の切断深さを特定し、この深さにおける実体比を、100μmにおけるパーセント表面接触面積として記録する。この手順を、2%の実体比における特定された高さよりも200μm及び300μm低い切断深さで繰り返し、これらの深さにおける実体比をそれぞれ、200μmにおけるパーセント表面接触面積及び300μmにおけるパーセント表面接触面積として記録する。全てのパーセント接触面積値を、0.1%単位で記録する。
上記した3D表面画像分析を5つの試料複製全ての3D表面トポロジー画像上で行った後で、以下の出力パラメータを定義し、報告する。100μmでの5つのパーセント表面接触面積の測定値の全ての算術平均を、100μmにおける平均パーセント表面接触面積として定義し、0.1%単位で報告する。200μmでの5つのパーセント表面接触面積の測定値の全ての算術平均を、200μmにおける平均パーセント表面接触面積として定義し、0.1%単位で報告する。300μmでの5つのパーセント表面接触面積の測定値の全ての算術平均を、300μmにおける平均パーセント表面接触面積として定義し、0.1%単位で報告する。5つ全ての2〜98%高さ測定値の算術平均を、平均2〜98%高さとして定義し、mm単位で0.01mm単位まで報告する。5つ全てのしわ周波数測定値の算術平均を平均しわ周波数として定義し、mm単位で0.001mm−1単位まで報告する。5つのしわ波長の測定値の全ての算術平均を、平均しわ波長として定義し、mmを単位として0.01mm単位で報告する。
試料の平均予歪みを、測定される力がセルの限界の1%〜90%以内となるロードセルを使用した、定速伸展の引張試験機で測定する(好適な計器は、MTS Systems Corp.(Eden Prairie,MN)から入手可能な、Testworks 4.0 Softwareを使用したMTS Insightである)。分析に先立ち、物品を23℃±2℃及び50%±2%の相対湿度で2時間調整し、その後同じ環境条件下で試験する。
不織布の局所坪量は、いくつかの利用可能な手法によって決定することができるが、簡単な代表的な1つの手法では、不織布の全体面積から選択された領域を表すウェブの試料片を切り出す。次に試料片を秤量し、その面積で割ることによって、不織布の局所坪量をグラム毎平方メートル(gsm)の単位で得る。結果を、選択された領域当たり2つの試料の平均として報告する。
このマイクロCTによる示強的性質の測定方法では、不織布ウェブ材料の試料の視覚的に区別可能な領域内の坪量、厚さ、及び体積密度の値を測定する。この方法は、マイクロCT器具(好適な器具は、Scanco Medical AG(Switzerland)から入手可能なScanco μCT 50、又は同等のものである)で得られる3D X線試料画像の分析に基づいたものである。このマイクロCT器具は、遮蔽キャビネットを備えた円錐ビームマイクロトモグラフである。メンテナンスフリーX線管を、焦点の直径が調節可能な線源として使用する。X線ビームは試料を通過し、X線の一部は試料によって減衰される。減衰の程度は、X線が通過しなければならない材料の質量と相関する。透過したX線は継続してデジタル検出器アレイに入射し、試料の2D投射像を生成する。回転させた試料の複数の個別の投射像を収集し、次いでこれらの投射像を単一の3D画像として再構成することによって、試料の3D画像が生成される。器具は、コンピュータで動作するソフトウェアと連動されることで画像の取得を制御し、生データを保存する。次いで、画像解析ソフトウェア(好適な画像解析ソフトウェアは、The Mathworks,Inc.(Natick,MA)から入手可能なMATLAB又は同等のものである)を使用して3D画像を分析して、試料内の領域の坪量、厚さ、及び体積密度の示強的性質を測定する。
測定用の試料を得るため、対象の不織布ウェブ材料の1枚の層を作業表面上に平らに広げて置き、直径30mmの円形片を打ち抜く。
製造業者の仕様書に従ってマイクロCT装置を準備し、較正する。試料を、適切なホルダー内の、25mmの内径を有する低密度材料の2つのリングの間に配置する。これにより、試料の中央部分が水平に置かれ、その上面及び下面に直接隣接する任意の他の材料を有さずに走査することができる。測定値はこの領域で取られなければならない。3D画像の視野はX−Y平面内で各辺が約35mmであり、約5000×5000ピクセルの解像度を有し、試料のZ方向を完全に含むだけの充分な数の厚さ7マイクロメートルのスライスが集められる。再構成された3D画像解像度は、7マイクロメートルの等方性ボクセルを含む。画像は、更なる低エネルギーフィルタなしに45kVp及び133μAの電源を用いて取得される。これらの電流及び電圧の設定値は、充分なX線が試料を透過して投射データのコントラストが最大となるように最適化することができるが、ひとたび最適化された後は全ての実質的に同様の試料について一定に維持される。積分時間1000ms及び3つの平均で、合計1500枚の投射画像が得られる。これらの投射画像は3D画像に再構成され、16ビットのRAWフォーマットで保存されることで、分析用の完全な検出器出力シグナルを保存する。
画像解析ソフトウェアに3D画像をロードする。閾値3D画像は、空気によるバックグラウンドシグナルを分離及び除去するが、基材内の試料繊維からのシグナルは維持する。
分析を行う領域を特定することにより開始する。分析される領域は、ゾーンと関連付けられている。ゾーンは、少なくとも2つの領域を含む。ゾーン及びその領域は、繊維及び/又はフィラメントの面密度、坪量、不透明度、キャリパー/厚さ、又はz方向の上昇により、視覚的に識別可能であるかあるいは別様に認識可能であってもよい。次に、分析を行う領域の境界を特定する。領域の境界は、試料内の他の領域と比較した場合の示強的性質の差の視覚的な区別によって特定される。例えば、領域の境界は、試料の別の領域と比較した場合の厚さ/キャリパーの差を視覚的に区別することに基づいて特定することができる。いずれの示強的性質を用いても、マイクロCTによる示強的性質の画像のいずれかの物理的試料自体の領域の境界を区別することができる。領域の境界が特定された時点で、楕円形又は円形の「対象領域(region of interest、ROI)」をその領域の内側に描く。ROIは、少なくとも0.1mm2の面積を有し、特定された領域を表す示強的性質の値を有する面積を測定するように選択する必要がある。3つの示強的性質の画像のそれぞれから、ROI内の平均の坪量、厚さ、及び体積密度を計算する。これらの値を、その領域の坪量として0.01gsm単位で、厚さとして0.1マイクロメートル単位で、更に体積密度として0.0001g/cc単位で記録する。
前述の説明を考慮すると、製品及び構成並びにこれらの組み合わせの以下の一般的な非限定的な例が想到される。
1.外側に面する層(610)と、着用者に面する層(620)と、外側に面する層と着用者に面する層との間に挟まれた弾性材料(630)と、を備える着用可能物品用の伸縮性積層体であって、
弾性材料は、積層体の製造の間に伸縮方向に沿って、ある予歪み率で予歪みを受けており、そのため、伸縮性積層体が弛緩状態にあるとき、外側に面する層及び着用者に面する層は、伸縮方向に沿ってギャザリングされ、
外側に面する層は、フィラメント(122)の集積体を含んだ不織布ウェブ材料の区分から形成され、内側表面(123)と外側表面(124)とを有し、外側表面は、ゾーン(160)の秩序配列を備え、各ゾーンは、ビルドアップ領域(271)に隣接する薄化領域(272)を備え、
薄化領域は第1の坪量を有し、ビルドアップ領域は第2の坪量を有し、第1の坪量は第2の坪量よりも小さく、坪量の差は、秩序配列に従うフィラメントの堆積量に対応する、伸縮性積層体。
2.外側に面する層(610)と、着用者に面する層(620)と、外側に面する層と着用者に面する層との間に挟まれた弾性材料(630)と、を備える着用可能物品用の伸縮性積層体であって、
弾性材料は、積層体の製造の間に伸縮方向に沿って、ある予歪み率で予歪みを受けており、そのため、伸縮性積層体が弛緩状態にあるとき、外側に面する層及び着用者に面する層は、伸縮方向に沿ってギャザリングされ、
外側に面する層は、フィラメントの集積体を含んだ不織布ウェブ材料の区分から形成され、内側表面(123)と外側表面(124)とを有し、
不織布ウェブ材料は、外側受容側面(260a)と内側面(260b)とを有し、作業位置(561)を通じて機械方向に沿って移動する連続的な成形ベルト(260)の上に紡糸フィラメント(122)を連続的に堆積させて、成形ベルト(260)の受容側面(260a)上に堆積されたフィラメントの芯(270)を形成することによって形成されており、成形ベルト(260)は、空気流透過性基材ベルト(261)と、基材ベルト上に配設された空気流遮断構造体(262)の秩序配列とを備え、それによって、空気流透過性領域(263)と、空気流遮断構造体と同一の広がりを有する空気流遮断領域(264)と、の秩序配列が成形ベルトに付与され、空気流遮断構造体(262)は、基材ベルト(261)から外向きにz方向に延在し、したがって、成形ベルト(260)の受容側面(260a)上で、あるz方向深さを有する必要があり、
フィラメントが成形ベルトと接触する前及び接触する際、フィラメントは、概ねz方向に沿ってベルトに向かい、かつベルトを貫くように方向付けられた空気流に取り込まれ、それにより、フィラメントは、空気流透過性領域(263)の上ではより大きな重量で成形ベルト(260)上に集積し、空気流遮断領域(264)の上ではより小さい重量で成形ベルト(260)上に集積して、空気流透過性部分の上には芯のビルドアップ領域(271)を生成し、空気流遮断領域の上には芯の薄化領域(272)を生成するようになっており、
芯(270)は、成形ベルト上での成形の後に不織布ウェブ材料へと圧密化され、
それによって、薄化領域は、主として不織布ウェブ材料の区分の外側表面内に1つ以上のz方向凹部を形成する、伸縮性積層体。
3.ゾーンによって構成された薄化領域及びビルドアップ領域と、ゾーン自体とが、視覚的に区別可能である、実施例1又は2に記載の伸縮性積層体。
4.弾性材料は、横断伸縮方向に互いから離間された複数の弾性ストランドを備える、実施例1〜3のいずれかに記載の伸縮性積層体。
5.弾性ストランドは、3.0mm以下、より好ましくは2.0mm以下、更により好ましくは1.0mm以下、更により好ましくは0.8mm以下、更により好ましくは0.5mm以下の平均ストランド間隔を有する、実施例4に記載の伸縮性積層体。
6.弾性ストランドは、300以下、より好ましくは200以下、更により好ましくは150以下、更により好ましくは100以下の平均デシテックスを有する、実施例4又は5に記載の伸縮性積層体。
7.予歪みの割合が平均予歪みであり、平均予歪みは、250パーセント以下、より好ましくは200パーセント以下、更により好ましくは150パーセント以下、更により好ましくは100パーセント以下である、実施例4〜6のいずれかに記載の伸縮性積層体。
8.弾性ストランドは、3.0mm以下、より好ましくは2.0mm以下、更により好ましくは1.0mm以下、更により好ましくは0.8mm以下の製造ストランド間隔を有する、実施例4に記載の伸縮性積層体。
9.予歪み率が製造予歪みであり、弾性ストランドは、250パーセント以下、より好ましくは200パーセント以下、更により好ましくは150パーセント以下、更により好ましくは100パーセント以下の製造予歪みで、外側に面する層と結合されている、実施例4〜8のいずれかに記載の伸縮性積層体。
10.予歪みの割合が製造予歪みであり、弾性ストランドは、250パーセント以下、より好ましくは200パーセント以下、更により好ましくは150パーセント以下、更により好ましくは100パーセント以下の製造予歪みで、外側に面する層と結合されている、実施例4、8又は9のいずれかに記載の伸縮性積層体。
11.積層体から離れて外側に面する層において、ゾーンのうちの少なくともいくつかは、繰り返し間隔で伸縮方向に沿って繰り返される、実施例1〜10のいずれかに記載の伸張性積層体。
12.繰り返し間隔は、少なくともゾーンのいくつかにわたって、弛緩した積層体において繰り返し間隔を5.0mm以上のギャザリング繰り返し間隔へとギャザリングさせるために、予歪率との組み合わせで十分である、実施例10に記載の伸縮性積層体。
13.外側に面する層は、秩序配列内のゾーンのいかなるパターンとも異なる、外側に面する層の結合のパターンを有する、実施例1〜12のいずれかに記載の伸縮性積層体。
14.外側に面する層は、少なくとも部分的に、ポリプロピレンと溶融添加剤とを含む樹脂から紡糸されたフィラメントから形成される、実施例1〜13のいずれかに記載の伸縮性積層体。
15.溶融添加剤は、エルカミド、ステアルアミド、オレアミド、シリコーン、及びこれらの組み合わせからなる群から選択される、実施例13に記載の伸縮性積層体。
16.外側に面する層は、少なくとも部分的に、二成分フィラメントから形成される、実施例1〜15のいずれかに記載の伸縮性積層体。
17.二成分フィラメントはコアシース構成を有する、実施例15に記載の伸縮性積層体。
18.二成分フィラメントは並列構成を有する、実施例15に記載の伸縮性積層体。
19.二成分フィラメントは、ポリプロピレンを含む第1の構成成分と、ポリエチレンを含む第2の構成成分とを有する、実施例15〜17のいずれかに記載の伸縮性積層体。
20.外側に面する層の外側表面は、約20パーセント〜約40パーセントの外掛百分率接触面積を呈し、着用者に面する層は、当該外掛百分率接触面積の少なくとも1.25倍、より好ましくは少なくとも約1.50倍、更に好ましくは少なくとも1.75倍、更により好ましくは少なくとも約2.0倍の内掛百分率接触面積を呈する着用者に面する表面を有する、実施例1〜19のいずれかに記載の伸縮性積層体。
21.着用者に面する層は、着用者に面する不織布材料の区分を備える、実施例1〜20のいずれかに記載の伸縮性積層体。
22.着用者に面する不織布材料は、繊維又はフィラメントの主としてランダムな分布を有する、実施例21に記載の伸縮性積層体。
23.着用者に面する不織布材料は、第2の坪量よりも小さい全体的な第3の坪量を有する、実施例21又は22のいずれかに記載の伸縮性積層体。
24.着用者に面する不織布材料は、着用者に面する層の結合のあるパターンを有する、実施例21〜23のいずれかに記載の伸縮性積層体。
25.外側に面する層(610)、着用者に面する層(620)、及び弾性材料(630)のうちの1つ以上が、顔料化剤又は乳白化剤を含む、実施例1〜24のいずれか1つに記載の伸縮性積層体。
26.着用者に面する層(620)及び弾性材料(630)のいずれか又は両方が、非白色の顔料化剤を含む、実施例25に記載の伸縮性積層体。
27.外側に面する層(610)が、白色の顔料化剤及び/又は青色の顔料化剤を含むフィラメントを含む、実施例25又は26のいずれかに記載の伸縮性積層体。
28.外側に面する層(610)は、第1の顔料化剤又は顔料化剤の第1の組み合わせを含んだフィラメントの第1の堆積と、第2の顔料化剤又は顔料化剤の第2の組み合わせを含んだフィラメントの第2の堆積と、を備え、第1の顔料化剤又は顔料化剤の第1の組み合わせは、含められる特定の顔料化剤及び重量濃度のうちの1つ以上において、第2の顔料化剤又は顔料化剤の第2の組み合わせとは異なる、実施例25〜27のいずれかに記載の伸縮性積層体。
29.外側に面する層(610)と着用者に面する層(620)は、少なくとも部分的に接着剤によって弾性材料(630)の周囲で一緒に結合される、実施例1〜28のいずれかに記載の伸縮性積層体。
30.外側に面する層(610)と着用者に面する層(620)は、積層体のx−y平面表面積の全体ではなく一部分に沿って、接着剤によって弾性材料(630)の周囲で一緒に結合される、実施例29に記載の伸縮性積層体。
31.外側に面する層(610)と着用者に面する層(620)は、少なくとも部分的に、外側に面する層及び着用者に面する層にそれぞれ含まれる材料が熱的に融着される積層体熱結合のパターンによって、弾性材料(630)の周囲で一緒に結合される、実施例1〜30のいずれかに記載の伸縮性積層体。
32.外側に面する層(610)と着用者に面する層(620)は、外側に面する層及び着用者に面する層にそれぞれ含まれる材料が熱的に融着される積層体熱結合のパターンによって、積層体のx−y平面表面積の全体ではないが一部分に沿って、弾性材料(630)の周囲で一緒に結合される、実施例29〜31のいずれかに記載の伸縮性積層体。
33.外側に面する層(610)と着用者に面する層(620)は、外側に面する層及び着用者に面する層にそれぞれ含まれる材料が熱的に融着される積層体熱結合のパターンによって、積層体のx−y平面表面積の第1の部分に沿ってのみ、弾性材料(630)の周囲で一緒に結合され、外側に面する層(610)と着用者に面する層(620)は、積層体のx−y平面表面積の第2の部分に沿ってのみ、接着剤によって弾性材料(630)の周りで一緒に結合される、実施例29〜32のいずれかに記載の伸縮性積層体。
34.外側に面する層は、ゾーンの秩序配列によって占有される第1のエリア(710)と、第2のエリア(720)とを備え、第2のエリアは、ギャザリングされていない状態において、外側に面する層の連続表面エリアにわたって薄化領域が存在しないことによって、第1のエリアと区別可能であり、約4cm2以上でありかつ約1cm未満のx−y平面内の寸法を有さず、第2のエリアは、ゾーンの配列における不連続性又は断絶を画定する外周によって、第1のエリアから線引きされる、実施例1〜33のいずれかに記載の伸縮性積層体。
35.第2のエリアは、第2の坪量よりも小さく、第1の坪量よりも大きい平均坪量を有する、実施例34に記載の伸縮性積層体。
36.外側に面する層(610)と着用者に面する層(620)は、少なくとも部分的に、外側に面する層及び着用者に面する層にそれぞれ含まれる材料が熱的に融着される積層体熱結合部のパターンによって弾性材料(630)の周りで一緒に結合され、パターンの熱結合部は、第2のエリアにおいては、単位表面積当たりより多数の結合部数で存在し、第1のエリアにおいては、単位表面積当たりより少数の結合部数で存在するか、あるいは、熱結合部は第1のエリアには実質的に存在しない、実施例34又は35のいずれかに記載の伸縮性積層体。
37.外側に面する層(610)と着用者に面する層(620)は、少なくとも部分的に第1のエリア内の接着剤によって弾性材料(630)の周囲で一緒に結合される、実施例35又は36のいずれかに記載の伸縮性積層体。
38.少なくとも部分的に、前述の実施例のいずれかの伸縮性積層体から形成された腰部囲繞ベルト部分を有する使い捨て吸収性パンツ。
39.少なくとも部分的に、実施例34〜37のいずれかに記載の伸縮性積層体から形成された腰部囲繞ベルト部分を有する使い捨て吸収性パンツであって、当該ベルト部分は、パンツの腰部開口縁部及び/又は脚部開口縁部を少なくとも部分的に形成し、第2のエリアは、腰部開口縁部及び/又は脚部開口縁部に沿って配設されている、使い捨て吸収性パンツ。
40.実施例35〜38のいずれかに記載の伸縮性積層体から形成された前側及び後側ベルト部分を備えた腰部囲繞ベルト部分を有する使い捨て吸収性パンツであって、第2のエリアは、前側ベルト部分と後側ベルト部分の一方又は両方の幅の大部分又は実質的に全てにわたって連続的である、使い捨て吸収性パンツ。
1.着用可能物品の構成要素として有用な伸縮性積層体(600)を製造するための方法であって、
1組のガイドローラー(562)の周りで循環する連続成形ベルト(260)を設ける工程であって、成形ベルト(260)は、外側受容側面(260a)と内側面(260b)とを備え、また空気流遮断構造(262)の秩序配列がその上に配設された空気透過性基材ベルト(261)を備え、空気流遮断構造(262)は、基材ベルト(261)から外向きにz方向に突出し、最外方ランド表面(262a)及び成形ベルト(260)の受容側面(260a)上にz方向深さを有し、それにより、ベルトは、空気流遮断構造(262)の秩序配列に対応する、空気流透過性領域(263)と空気流遮断構造(264)との配列を有し、
成形ベルトの移動の作業位置(561)の下方に、かつその内側面(260b)の近くに、成形真空システム(555)を設ける工程であって、成形ベルト(260)は、作業位置(561)を通って機械方向MDに移動する、工程と、
成形ベルト(260)の作業領域(561)に対して概ねz方向に移動する空気流の中へと個々のポリマー流(122a)の流れを連続的に導入して取り込む工程と、
紡糸フィラメント(122)を形成するために、空気流を介してポリマー流(122a)を連続的に減衰させる工程と、
作業位置(561)に、空気流及び取り込まれた紡糸フィラメント(122)を連続的に方向付ける工程と、
成形ベルト(260)の空気流透過性領域(263)が作業位置(561)を通じて機械方向に沿って移動するときに、空気流透過性領域(263)を通じて空気流に空気を連続的に引き込むために、成形真空システム(555)を使用する工程であって、それによって、主として空気流透過性領域(263)に向かって、またその空気流透過領域の上へ、取り込まれたフィラメント(122)を引き込み、その結果、フィラメントは、空気流透過性領域(263)の上ではより大きな重量で集積し、空気流遮断領域(264)の上ではより小さい重量で集積して、成形ベルト(260)の受容側面(260a)上に、集積したフィラメント(122)の芯(270)を形成し、それにより、芯は、成形ベルト(260)上の空気流遮断構造(262)の秩序配列と対応する、ビルドアップ領域(271)と薄化領域(272)との配列を設けられる、工程と、
圧縮ローラー(570)を介して成形ベルト(260)に対して芯を圧縮する工程であって、薄化領域(272)内のフィラメントが、ランド表面(262a)と圧縮ローラー(570)との間の圧力によって変形される、工程と、
成形ベルト(260)から芯(270)を離して持ち上げる工程と、
成形ベルト(260)上の空気流遮断構造(262)の秩序配列に対応する、ビルドアップ領域(271)と薄化領域(272)との秩序配列を有する、圧密化された不織布ウェブ材料(280)を形成するために、芯(270)を更に圧密化する工程と、
伸縮性積層体を製造する工程であって、
伸縮性積層体の外側に面する層(610)を形成するために、圧密化された不織布ウェブ材料(280)を提供する工程と、
弾性材料(630)を提供し、伸長方向に沿って当該弾性材料に予歪みを与える工程と、
伸縮性積層体の着用者に面する層(620)を形成するために、第2のウェブ材料を提供する工程と、
外側に面する層(610)と着用者に面する層(620)との間に、予歪み状態にある弾性材料(630)を挟む工程と、
伸縮性積層体(600)を形成するために、外側に面する層(610)と、弾性材料(630)と、着用者に面する層(620)とを互いに付着させる工程と、によって製造する工程と、を含む方法。
2.1対のカレンダー結合ローラー(571、573)の間のニップ(571a)を通じて芯を移送する工程であって、それによって、芯を圧密化し、圧密化されカレンダー結合された不織布ウェブ材料を形成するように、芯に結合部のパターンを付与する、工程、を更に含む、実施例1に記載の方法。
3.弾性材料はフィルムを含む、実施例1又は2のいずれかに記載の方法。
4.弾性材料は、伸縮方向と実質的に整列され、かつ横断伸縮方向に離間された複数の弾性ストランドを含む、実施例1又は2のいずれかに記載の方法。
5.弾性材料はビーム型弾性体を含む、実施例5に記載の方法。
Claims (15)
- 外側に面する層(610)と、着用者に面する層(620)と、前記外側に面する層と前記着用者に面する層との間に挟まれた弾性材料(630)と、を備える着用可能物品用の伸縮性積層体であって、前記弾性材料は、前記積層体の製造の間に伸縮方向に沿って、ある予歪み率で予歪みを受けており、そのため、前記伸縮性積層体が弛緩状態にあるとき、前記外側に面する層及び前記着用者に面する層は、前記伸縮方向に沿ってギャザリングされ、
前記外側に面する層は、フィラメント(122)の集積体を含んだ不織布ウェブ材料の区分から形成され、内側表面(123)と外側表面(124)とを有し、前記外側表面は、ゾーン(160)の秩序配列を備え、各ゾーンは、ビルドアップ領域(271)に隣接する薄化領域(272)を備え、
前記薄化領域は第1の坪量を有し、前記ビルドアップ領域は第2の坪量を有し、前記第1の坪量は前記第2の坪量よりも小さく、坪量の差は、前記秩序配列に従う前記フィラメントの堆積量に対応する、伸縮性積層体。 - 前記不織布ウェブ材料は、外側受容側面(260a)と内側面(260b)とを有し、作業位置(561)を通じて機械方向に沿って移動する連続的な成形ベルト(260)の上に紡糸フィラメント(122)を連続的に堆積させて、前記成形ベルト(260)の前記受容側面(260a)上に堆積されたフィラメントの芯(270)を形成することによって形成されており、前記成形ベルト(260)は、空気流透過性基材ベルト(261)と、前記基材ベルト上に配設された空気流遮断構造体(262)の秩序配列とを備え、それによって、空気流透過性領域(263)と、前記空気流遮断構造体と同一の広がりを有する空気流遮断領域(264)と、の秩序配列が前記成形ベルトに付与され、前記空気流遮断構造体(262)は、前記基材ベルト(261)から外向きにz方向に延在し、したがって、前記成形ベルト(260)の前記受容側面(260a)上で、あるz方向深さを有する必要があり、
前記フィラメントが成形ベルトと接触する前及び接触する際、前記フィラメントは、概ねz方向に沿って前記ベルトに向かい、かつ前記ベルトを貫くように方向付けられた空気流に取り込まれ、それにより、前記フィラメントは、前記空気流透過性領域(263)の上ではより大きな重量で前記成形ベルト(260)上に集積し、前記空気流遮断領域(264)の上ではより小さい重量で前記成形ベルト(260)上に集積して、前記空気流透過性部分の上には前記芯のビルドアップ領域(271)を生成し、前記空気流遮断領域の上には前記芯の薄化領域(272)を生成するようになっており、
前記芯(270)は、前記成形ベルト上でのその成形の後に不織布ウェブ材料へと圧密化され、
それによって、前記薄化領域は、主として不織布ウェブ材料の前記区分の前記外側表面内に1つ以上のz方向凹部を形成する、請求項1に記載の伸縮性積層体。 - 前記ゾーンによって構成された前記薄化領域及び前記ビルドアップ領域と、前記ゾーン自体とが、視覚的に区別可能である、請求項1又は2に記載の伸縮性積層体。
- 前記弾性材料は、横断伸縮方向に互いから離間された複数の弾性ストランドを備える、請求項1〜3のいずれか一項に記載の伸縮性積層体。
- 前記弾性ストランドは、3.0mm以下、より好ましくは2.0mm以下、更により好ましくは1.0mm以下、更により好ましくは0.8mm以下、更により好ましくは0.5mm以下の平均ストランド間隔を有する、請求項4に記載の伸縮性積層体。
- 前記弾性ストランドは、300以下、より好ましくは200以下、更により好ましくは150以下、更により好ましくは100以下の平均デシテックスを有する、請求項4又は5に記載の伸縮性積層体。
- 前記予歪みの割合が平均予歪みであり、前記平均予歪みは、250パーセント以下、より好ましくは200パーセント以下、更により好ましくは150パーセント以下、更により好ましくは100パーセント以下である、請求項4〜6のいずれか一項に記載の伸縮性積層体。
- 前記弾性ストランドは、3.0mm以下、より好ましくは2.0mm以下、更により好ましくは1.0mm以下、更により好ましくは0.8mm以下の製造ストランド間隔を有する、請求項4に記載の伸縮性積層体。
- 前記予歪み率が製造予歪みであり、前記弾性ストランドは、250パーセント以下、より好ましくは200パーセント以下、更により好ましくは150パーセント以下、更により好ましくは100パーセント以下の製造予歪みで、前記外側に面する層と接合されている、請求項4〜8のいずれか一項に記載の伸縮性積層体。
- 前記外側に面する層は、少なくとも部分的に、ポリプロピレンと溶融添加剤とを含む樹脂から紡糸されたフィラメントから形成される、請求項1〜9のいずれか一項に記載の伸縮性積層体。
- 前記溶融添加剤は、エルカミド、ステアルアミド、オレアミド、シリコーン、及びこれらの組み合わせからなる群から選択される、請求項10に記載の伸縮性積層体。
- 前記外側に面する層は、少なくとも部分的に、二成分フィラメントから形成される、請求項1〜11のいずれか一項に記載の伸縮性積層体。
- 前記外側に面する層の前記外側表面は、約20パーセント〜約40パーセントの外掛百分率接触面積を呈し、前記着用者に面する層は、前記外掛百分率接触面積の少なくとも1.25倍、より好ましくは少なくとも約1.50倍、更に好ましくは少なくとも1.75倍、更により好ましくは少なくとも約2.0倍の内掛百分率接触面積を呈する着用者に面する表面を有する、請求項1〜12のいずれか一項に記載の伸縮性積層体。
- 前記外側に面する層(610)と前記着用者に面する層(620)は、前記積層体の前記x−y平面表面積の全体ではなく一部分に沿って、接着剤によって前記弾性材料(630)の周囲で互いに結合される、請求項1〜13のいずれか一項に記載の伸縮性積層体。
- 前記外側に面する層は、ゾーンの前記秩序配列によって占有される第1のエリア(710)と、第2のエリア(720)とを備え、前記第2のエリアは、ギャザリングされていない状態において、前記外側に面する層の連続表面エリアにわたって薄化領域が存在しないことによって、前記第1のエリアと区別可能であり、約4cm2以上でありかつ約1cm未満の前記x−y平面内の寸法を有さず、前記第2のエリアは、ゾーンの前記配列における不連続性又は断絶を画定する外周によって、前記第1のエリアから線引きされる、請求項1〜14のいずれか一項に記載の伸縮性積層体。
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- 2019-06-10 EP EP19733372.7A patent/EP3810054B1/en active Active
- 2019-06-10 CN CN201980037910.8A patent/CN112218606B/zh active Active
- 2019-06-10 EP EP22176315.4A patent/EP4079273B1/en active Active
- 2019-06-10 PL PL22176315.4T patent/PL4079273T3/pl unknown
- 2019-06-10 EP EP23204254.9A patent/EP4286152A3/en active Pending
- 2019-06-10 WO PCT/US2019/036265 patent/WO2019245775A1/en unknown
- 2019-06-10 RU RU2020136207A patent/RU2757890C1/ru active
- 2019-06-10 JP JP2020568767A patent/JP2021526062A/ja active Pending
- 2019-06-10 CN CN202210430997.9A patent/CN114948441A/zh active Pending
- 2019-06-10 ES ES19733372T patent/ES2927356T3/es active Active
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EP4079273A1 (en) | 2022-10-26 |
RU2757890C1 (ru) | 2021-10-22 |
EP4079273B1 (en) | 2023-11-29 |
WO2019245775A1 (en) | 2019-12-26 |
EP4286152A3 (en) | 2024-03-06 |
PL3810054T3 (pl) | 2022-09-12 |
CA3101871C (en) | 2023-08-22 |
ES2927356T3 (es) | 2022-11-04 |
EP3810054B1 (en) | 2022-07-27 |
CN112218606B (zh) | 2022-05-27 |
CN114948441A (zh) | 2022-08-30 |
EP4286152A2 (en) | 2023-12-06 |
CN112218606A (zh) | 2021-01-12 |
EP3810054A1 (en) | 2021-04-28 |
BR112020024578A2 (pt) | 2021-03-02 |
CA3101871A1 (en) | 2019-12-26 |
PL4079273T3 (pl) | 2024-02-26 |
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