JP6258987B2 - ウェブを変形させるための装置及びプロセス - Google Patents
ウェブを変形させるための装置及びプロセス Download PDFInfo
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- JP6258987B2 JP6258987B2 JP2016020313A JP2016020313A JP6258987B2 JP 6258987 B2 JP6258987 B2 JP 6258987B2 JP 2016020313 A JP2016020313 A JP 2016020313A JP 2016020313 A JP2016020313 A JP 2016020313A JP 6258987 B2 JP6258987 B2 JP 6258987B2
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Description
用語「吸収性物品」は、生理用ナプキン、パンティライナー、タンポン、陰唇間装置、創傷包帯、おむつ、成人失禁用物品、拭き取り用品等の使い捨て物品を含む。更に、本明細書に開示される方法及び装置によって生産される吸収性部材は、研磨パッド、ドライモップパッド(SWIFFER(登録商標)パッド等)等の他のウェブにおいても有用であり得る。かかる吸収性物品の少なくとも一部は、月経又は血液、膣分泌物、尿、及び便等の体液の吸収を目的とする。拭き取り用品は、体液を吸収するために使用されてもよく、又は表面を洗浄する等、他の目的で使用されてもよい。上記の種々の吸収性物品は、典型的には、液体透過性トップシート、トップシートに接合される液体不透過性バックシート、及びトップシートとバックシートとの間の吸収性コアを含む。
本発明は、変形ウェブ材料、並びにウェブを変形させるための方法及び装置に関する。更なる特性を有するウェブを提供する、ウェブ中の新しい構造を形成することが可能である、方法及び装置が開示される。用語「変形ウェブ材料」が本明細書で利用されるが、目的は、かかる変形ウェブ材料から吸収性物品のための吸収性部材(又は非吸収性構成要素)等の構成要素を作成することであることが理解されるべきである。そのような場合、変形ウェブ材料は、吸収性物品のための個々の構成要素に切り分けられる。変形ウェブ材料はまた、梱包材料及びごみ袋が挙げられるがこれらに限定されない、吸収性物品以外の製品で使用され得る。
従来技術のアプローチは、特徴の制御された配置を伴う、明確に画定された、混合された特徴を作成するのに好適ではない。したがって、特徴の2つ以上のセットの形成に対するより良好な独立制御を可能にするプロセスを設計することが望ましい。特徴の各セットの形成に対するより良好な独立制御を達成するための2つのアプローチが、ここに提供される。1つのアプローチは、別個の雄型形成要素を備える2つのロールを有する、単一ニップを利用し、少なくとも1つのロールは、2つ以上の凸状隆起部を備える。第2のアプローチは、特徴の複数のセットの制御された配置及び配向を可能にするマルチヒット(マルチニップ)構成を含む。これらのアプローチのそれぞれは、特徴の所望の寸法及び/又は形状が達成されるように、特徴の各セットの形成に対する独立制御、及びウェブのロールとのより良好なパターンの適合を可能にし得る。
以下の図面は、特定のロール配列の非限定的な実施例、及びそれによって形成され得る変形ウェブ材料を示す。
図14は、それらの間に単一ニップNを形成する単一対のロールを備える装置160の一実施例を示す。ロールは、ウェブの表面に対して異なる方向で配向される、少なくとも2つの変形のセットで、ウェブを変形させるために構成される。これは、ロールの外周の周囲に延在する複数の隆起部164及び溝166、並びに隆起部164の上面から外側に延在する複数の第1の離間した形成要素168を有する、ロール162の1つを提供し、その表面上に複数の第2の形成要素172を有し、第2の形成要素の先端が、第1のロール162上の隆起部164の少なくとも一部の頂部を越える深さまで、第1のロールの軸に向かって内側に延在する、第2のロール170を提供することによって達成され得る。
本明細書の所望の方法はまた、複数の変形工程を利用してもよい。かかる複数の変形工程は、本明細書の上記の節に記載される任意の好適な装置によって実施され得る。複数の変形工程を利用する方法が、標準入れ子配列で比較的少数のロールを有する入れ子装置で実施されるものとして示されるが、これは、図を簡単にするために行われ、本明細書に記載される装置(混成、閉ループ、及び共通バンク装置等)のいずれも、所望の変形を実施するために、任意の好適な数のロールと共に使用され得ることが理解されるべきである。
変形ウェブ材料及びそれを作成する方法の多くの代替の実施形態が可能である。
Claims (8)
- 間にニップを形成する2つの相互噛合逆回転ロールを備える装置であって、
a)概して円筒形の第1のロールであって、前記第1のロールは、軸及び外周を有し、前記第1のロールは、
前記ロールの前記外周の表面上の複数の周辺第1隆起部及び周辺第1溝であって、前記第1隆起部は上面を有し及び前記第1溝は底面を有する、複数の周辺第1隆起部及び周辺第1溝と、
前記第1隆起部の前記上面から外側に延在する複数の離間される歯であって、各歯は、前記上面から先端へと先細りになり、前記第1隆起部の前記上面は、前記歯の前記先端と前記第1溝の前記底面との間に位置づけられる、複数の離間される歯と、
を備える、と、
b)概して円筒形の第2のロールであって、前記第2のロールは、複数の連続的な周辺第2隆起部及び第2溝を備える、と、
を備え、
前記第1隆起部の前記上面および前記第1溝の前記底面との間の距離として定義される溝高さは、前記歯の高さの少なくとも25%である装置。 - 前記第1のロールは横方向幅を備え、及び前記第1隆起部の前記上面と前記第1溝の前記底面との間の距離は、前記第1のロールの前記外周の周り及び前記横方向幅にわたって同一である、請求項1に記載の装置。
- 前記第1のロールは横方向幅を備え、及び前記第1隆起部の前記上面と前記第2溝の前記底面との間の距離は、前記第1のロールの前記外周の周り又は前記横方向幅にわたって変動する、請求項1に記載の装置。
- 装置を用いてウェブを変形させるためのプロセスであって、前記プロセスは、
a)概して円筒形の第1のロールであって、前記第1のロールは軸及び外周を有し、前記第1のロールは、
1)前記第1のロールの前記外周の表面上の前記第1のロールの前記外周の周りに延在する複数の第1隆起部及び第1溝であって、前記第1隆起部は上面を有し、及び前記第1溝は底面を有する、複数の第1隆起部及び第1溝と、
2)前記第1隆起部の前記上面から外側に延在する複数の離間される歯であって、前記歯は先端を有し、前記第1隆起部の前記上面は、前記歯の前記先端と前記第1溝の前記底面との間に配置される、複数の離間される歯と、
を備える、第1のロールと、
b)概して円筒形の第2のロールであって、前記第2のロールは、複数の連続的な周辺第2隆起部及び第2溝を備え、前記第2隆起部は上面を有し、及び前記第2溝は底面を有する、第2のロールと、
を備える2つの相互噛合ロール間に形成されるニップに先駆体ウェブを送り込む工程を含み、
前記ウェブが前記ニップに送り込まれるとき、前記第1のロールの少なくともいくつかの前記第1隆起部の上端は、前記第2のロールの少なくともいくつかの前記第2隆起部の上端を越える深さまで前記第2のロールの前記軸に向かって内側に延在し、及び前記ウェブは、(i)複数の離間される第1の場所で前記歯によって穴が開けられて、複数の離間される開口部を形成し、
前記第1隆起部の前記上面および前記第1溝の前記底面との間の距離として定義される溝高さは、前記歯の高さの少なくとも25%であるプロセス。 - 少なくとも前記第1のロール又は前記第2のロールは、また、前記ウェブを更に伸張または変形させるための1つ又は複数の追加のロールとニップを形成する、請求項4に記載のプロセス。
- 前記相互噛合ロールは加熱されない、請求項4に記載のプロセス。
- 前記相互噛合ロールは加熱される、請求項4に記載のプロセス。
- 前記ウェブは、不織布、ラミネート、フィルム及びそれらの組み合わせからなる群から選択される材料を備える、請求項4に記載のプロセス。
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