JP5117575B2 - ウェブを活性化するための方法 - Google Patents
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Description
「吸収性物品」は、液体を吸収及び保管できる物品を意味する。「着用可能な吸収性物品」は、着用者の身体に接して、又は近接して配置され、身体から排出されることがある排出物を吸収及び収容するためのデバイスである。着用可能な吸収性物品の非限定的な例には、おむつ及びトレーニングパンツが挙げられる。
理論によって制限されることなく、活性化の方向が突然変化する(例えば、ウェブの隣接する区域でCD活性化からMD活性化に)ウェブの領域で、ウェブに適用された局所的な応力の量は、活性化プロセス中にウェブに望ましくない損傷を与えるのに十分な程高い場合があると考えられている。ウェブへの損傷は更に、ウェブをその意図された使用に商業的に不適切な状態(例えば、過度のピンホール、裂け、穿薄層化及び/又は弱化)にする程に重大である場合がある。活性化の方向が突然変化するウェブの区域では、ウェブが活性化プロセスによって伸張され、変形されるとき、ウェブが占有する、活性化ロール上に存在する三次元表面形状間の空間が十分でない場合がある。活性化の区域を空間的に分離することは、ウェブの損傷の問題を解決する場合もあるが、しかしその一方では、材料の活性化されていない部分は、隣接する活性化された部分の弾性特性を望ましくなく制限することがあるため、材料は、活性化されていない区域に接する区域で、その弾性特性の一部又は更には全てを失うことがあり得る。ウェブの1つ以上の部分での伸張喪失は、ウェブの所望の特性、例えば、布らしさ、柔軟性、伸縮性を損なう恐れがある。驚くべきことに、ロール上の領域間に、活性化の異なる方向をもたらす好適な緩衝領域を定置することによって、望ましくない伸張の「抑制」を発生させることなく、活性化中のウェブへの望ましくない損傷を最小化する、又は更に排除することができるということが見出された。
図9は平坦で、非収縮状態の使い捨て吸収性物品20の実施例を示す。図9の使い捨て吸収性物品20は、使い捨ておむつ又はトレーニングパンツなどの着用可能物品であってもよい。使い捨て吸収性物品20は、腰部開口部及び少なくとも1つの脚部開口部を形成するために、締結された構成(即ち、物品20は締結可能、再締結可能又は事前締結可能であり得る)で配置されてもよい。使い捨て吸収性物品20は、長手方向(Y)に延びる長手方向中心線10及び横方向(X)に延びる横方向中心線86を含んでもよい。この長手方向及び横方向は、MD及びCDにそれぞれ平行であってもよい。使い捨て吸収性組立品20は、液体透過性トップシート24、外側カバー22及びトップシート24と外側カバー22との間に配置された吸収性コア26を含んでもよい。外側カバー22は、脚部バンド部分33を含んでもよい。物品20が締結された構成であるとき、外側カバー22の脚部バンド部分33は、脚部開口部の全体の周囲を取り囲むことができる。使い捨て吸収性物品20は脚部バンド部分33に結合された1つ以上の弾性ストランド又は弾性脚部バンド32を含んでもよい。脚部バンド32は脚部バンド部分33と同一の広がりを持ってもよいが、そうである必要は必ずしもない。脚部バンド32は、延伸性不織布及び/又はフィルムの1つ以上の層と共にラミネートされた弾性材料層(例えば、ストランド、フィルム又は不織布)を含んでもよい脚部バンド32は、ライブ伸張(live stretch)又はゼロ歪伸張ラミネートであってもよい。ライブ伸張ラミネートでは、延伸性不織布へのラミネートの前に、弾性材料は典型的に、ある程度伸張される。ライブ伸張の1つの利点は、活性化中において、ラミネートへの局部化された圧力が低減され得ることである。しかしながら、存続する伸張ラミネートは、ゼロ歪みラミネートよりも更に不織布材料を必要とすることがあるので、したがってより高価である場合がある。脚部バンドを、股領域の外側カバーの側縁部の横方向内側、又は横方向外側に、ぴったりと重ねて取り付けることができる。使い捨て吸収性物品が締結された構成にあるとき、伸縮性の脚部開口部をもたらすために、外側カバー22の脚部バンド32及び/又は脚部バンド部分33は連続的に又は断続的に活性化されてもよい。
Claims (19)
- 伸縮性材料(800)を複数の方向で同時に機械的に変形させる方法であって、前記方法は、
前記伸縮性材料(800)を、回転可能な第1のロール(210)と回転可能な第2のロール(220)との間に形成されたニップ(240)の中に送る工程を含み、
前記第1及び第2のロール(210、220)は、
少なくとも1つの三次元の表面形状(436、437)を含む第1の領域(470)であって、前記第1のロール(210)の前記第1の領域(470)の前記三次元表面形状(1つ又は複数)(436、437)と、前記第2のロール(220)の前記第1領域の前記三次元表面形状(1つ又は複数)(436、437)とが、互いに相補的であり、かつ互いに対して位置付けられ、それによって、前記第1のロール(210)及び前記第2のロール(220)が回転されるとき、前記第1及び第2のロール(210、220)の前記第1の領域(470)の前記三次元表面形状(436、437)が噛み合い、前記噛み合う表面形状(436、437)が前記伸縮性材料(800)を第1の方向で機械的に変形させるように動作可能に構成されている、第1の領域(470)と、
少なくとも1つの三次元の表面形状(446、447)を含む第2の領域(440)であって、前記第1のロール(210)の前記第2の領域(440)の前記三次元表面形状(1つ又は複数)(446、447)と、前記第2ロール(220)の前記第2領域(440)の前記三次元表面形状(1つ又は複数)(446、447)とが、互いに相補的であり、かつ互いに対して位置付けられ、それによって、前記第1のロール(210)及び前記第2のロール(220)が回転されるとき、前記第1及び第2のロール(210、220)の前記第2の領域(440)の前記三次元表面形状(446、447)が噛み合い、前記第1及び第2ロール(210、220)の前記第2領域(440)の前記噛み合う表面形状(446、447)が前記伸縮性材料(800)を、前記第1の方向とは異なる第2の方向で機械的に変形させるよう動作可能に構成されている、第2の領域(440)と、
前記第1の領域(440)と第2の領域(470)との間に配置された、前記ロールの別個の部分を空間的に分離する緩衝領域(450、460)とを含む、方法。 - 前記緩衝領域(450、460)は、約2〜30mmの幅を有する、請求項1に記載の方法。
- 前記緩衝領域(450、460)は、約5〜20mmの幅を有する、請求項1に記載の方法。
- 前記第1及び第2の領域(440、470)の少なくとも一方の前記三次元表面形状(436、437、446、447)は、少なくとも1mmのピッチ(350)を有する起立部分(436、446)を含む、請求項1に記載の方法。
- 前記第1及び第2のロール(210、220)は、360度回転するように構成されており、前記第1及び第2のロール(210、220)は、各360度の回転に対して前記伸縮性材料(800)を2回以上機械的に変形させるように構成されている、請求項1に記載の方法。
- 前記第1及び第2のロール(210、220)は、360度回転するように構成されており、前記伸縮性材料(800)は分離された物品を含み、前記第1及び第2のロール(210、220)は、各360度の回転に対して2つ以上の前記物品を機械的に変形させるように構成されている、請求項1に記載の方法。
- 前記第1及び第2のロール(210、220)は、前記伸縮性材料(800)を機械方向及び横断方向の少なくとも一方の方向に断続的に機械的に変形させるように構成されている、請求項1に記載の方法。
- 前記第1の方向は機械方向であり、前記第1及び第2のロール(210、220)は、前記伸縮性材料(800)を横断方向に断続的に機械的に変形させるように構成されている、請求項1に記載の方法。
- 前記第1及び第2の機械的に変形させる方向は、機械方向、横断方向、対角線方向及び曲線状の方向からなる群から選択される、請求項1に記載の方法。
- 前記伸縮性材料(800)は、弾性材料に結合された延伸性材料を含み、前記伸縮性材料は使い捨て吸収性物品用の外側カバーとしての使用に好適である、請求項1に記載の方法。
- 前記伸縮性材料(800)は、本体部分及び脚部バンド部分(33)を含み、前記第1の領域(470)は、前記本体部分を機械的に変形させるように構成されており、前記第2の領域(440)は前記脚部バンド部分(33)を機械的に変形させるよう構成されている、請求項10に記載の方法。
- 前記本体部分は横断方向で機械的に変形され、前記脚部バンド部分(33)は機械方向で機械的に変形される、請求項11に記載の方法。
- 前記脚部バンド部分(33)は、前記脚部バンド部分(33)に結合された脚部バンドを含む、請求項12に記載の方法。
- 前記第1及び第2のロール(210、220)の少なくとも一方は、軸方向の緩衝領域(460)及び周方向の緩衝領域(450)を含む、請求項1に記載の方法。
- 前記方法は、複数の工程からなるおむつ製造プロセスのうちの単一の工程である、請求項1〜14のいずれか一項に記載の方法。
- 前記伸縮性材料(800)は、使い捨て吸収性物品(20)での外側カバー(22)としての使用に好適であり、前記単一工程は、前記外側カバー(22)を機械的に変形させることを含む、請求項15に記載の方法。
- 前記第1及び第2のロール(210、220)は、前記伸縮性材料(800)を前記第2の方向で機械的に変形させるように構成された第3の領域(441)を含み、前記第2及び第3の領域(440、441)は、前記伸縮性材料(800)のうち互いに異なる部分を機械的に変形させるように構成されている、請求項1に記載の方法。
- 前記第1及び第2の領域(470、440)の少なくとも一部分及び前記第1及び第3の領域(470、441)の少なくとも一部分は、緩衝領域(450、460)によって分離されている、請求項17に記載の方法。
- 前記第2及び第3の領域(440、441)は、前記第1及び第2のロール(210、220)の第1及び第2の軸方向反対側の端部上にそれぞれ配置されており、前記第2及び第3の領域(440、441)は、それらの各々の端部から軸方向内側に60mm以下で延びている、請求項17に記載の方法。
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- 2008-11-19 JP JP2010534281A patent/JP5117577B2/ja not_active Expired - Fee Related
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