JP2022113681A - 通気性を有する微孔性熱可塑性の薄いフィルム - Google Patents
通気性を有する微孔性熱可塑性の薄いフィルム Download PDFInfo
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- JP2022113681A JP2022113681A JP2022078785A JP2022078785A JP2022113681A JP 2022113681 A JP2022113681 A JP 2022113681A JP 2022078785 A JP2022078785 A JP 2022078785A JP 2022078785 A JP2022078785 A JP 2022078785A JP 2022113681 A JP2022113681 A JP 2022113681A
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Abstract
Description
「活性化欠陥」、「活性化孔」、または「ピンホール」は、フィルムが形成され、積層され、活性化され、または他の製造段階若しくは加工段階を経る間の、フィルム内の小さな孔または引裂を意味し、これはその後引裂強度の低下、多孔性の増大、漏れの増大、または他の望ましくない性質をもたらし得る。
本発明のフィルムは、熱可塑性の単層または多層のフィルムであり、約5gsmから約20gsmの、或いは約5から約15gsm、或いは約10から約15gsm、或いは約8から約13gsm、或いは約10gsmから約12gsm、或いは約15gsm未満、或いは14gsm未満、或いは約12gsm未満、および或いは約10gsm未満の坪量を有してよい。本発明の多層フィルムは、少なくとも2層、或いは少なくとも3層、或いは少なくとも5層、或いは少なくとも7層、或いは少なくとも9層、或いは少なくとも11層、或いは2から約20層、或いは3から約11層、および或いは5から11層を含んでよい。フィルムは、外側表面の一方または両方のタック性を減少させるためのスキン層を含んでよく、または含まなくてよい。
一実施形態において、フィルム、または多層フィルムの1つ以上の層は、約0.1%から約90%、或いは約1%から約60%、或いは約20%から約50%、或いは約20%から約40%、或いは約1%から約10%の、ポリプロピレン、ポリプロピレン系組成物またはコポリマー、エチレン、エチレン系組成物またはコポリマー、またはそれらの組み合わせを含む。
図1は、本発明のフィルムの形成に適する、フィルム形成装置10の例示的な構成を示す。フィルムまたは不織材料に用いられるとき「マシン方向」はフィルムまたは不織材料がフィルム形成装置内で加工されるとき移動する方向と並行な方向を意味する。「横方向」は、マシン方向と垂直な方向を意味する。非制限的な一実施例において、図1に示されるように、フィルム形成装置10は、キャスティング/ドローイングセクション12、マシン方向配向(MDO)セクション14、および横方向嵌合ローラ(CDI)セクション16を含む。任意に、フィルム形成装置10は、アニーラセクション、ワインダ、追加のマシン方向配向セクション、および/またはコロナ処理セクションなど、当業者には明白であろう、追加のセクションを含んでよい。他の実施形態において、セクションまたはその構成要素の順序は、これも当業者には理解されるように、図1に示されるものと異なってよい。
フィルムの不透明性は、以下のように測定される。測定方法は、黒色の裏打ちと組み合わされたサンプルに対する、白色の裏打ちと組み合わされた同じサンプルの反射率の比を用いる。Hunterlab比色計D25Aは、製造者の仕様に従って較正され、標準化される。サンプルは、測定器ののぞき窓の開口部を覆うのに十分な大きさに切断される。サンプルは、ゴムロールサイドまたはカールサイドアップを有する窓に配置される。サンプルは、較正されていない白色のタイルで覆われる。「Read」および「xyz」が押される。白色タイルを取り外す。サンプルが黒色ガラスタイルで覆われる。「100%」が押される。サンプルの「y」値が、パーセントで表された不透明性の値と共に表示される。全ての例において、サンプルは、横方向(CD)に徐々に延伸された(CDI)。
ヒドロヘッド圧は、AATCC 127-2008に記載される方法に従って測定されてよい。具体的には、Textest Instrument FX 3000 Hydrotester III, 05/07 s/n 597またはその上位機種が使用され得る。標準的な試験の勾配は60mbar/minであり、70gsmスパンボンド/パターンボンドポリプロピレン不織布が、支持体として使用される。試験の終点は第3のドロップであり、第1、第2、および第3のドロップがサンプルを貫通する時、mbar単位での圧力が記録され、および/またはサンプルが破裂するときの圧力が記録される。もしも水の貫通が観察されない場合、最大の試験圧力が記録される。
サンプルテンプレートは、寸法3”×6”を有するよう切断される。このテンプレートから、長い側部が4”、平行な短い側部が1”、および高さ(側部に垂直に測定された、平行な側部の間の距離)が3”の台形のテンプレートの印を付ける。短い側端部の中央から開始して、短い側部に垂直に長さ5/8”のスリットを入れる。テンプレートをInstron Model 1122、4301または一定の延伸速度を有する同等の引張試験機のクランプに配置する。クランプ間の距離を1”に設定する。説明書に従ってロードセルを調製し標準化する。シリーズIXソフトウェアを備えた引張試験機に関して、ソフトウェアの「方法」メニューから適切なシリーズIX試験法を選択する。
フィルムが、前述の方法に従って形成された。ポリマー配合物は重量にして48%のポリエチレン、45%の炭酸カルシウム、6%のポリプロピレン、および1%の加工助剤を含むものだった。この配合物は、溶融ブレンドされ、約260℃の温度で単層として押し出され、1分あたり約45.7mで回転し、温度が116℃である冷却ローラ上に押出された。フィルムは、速度V2(1分あたり149m)および温度88℃で運転される延伸ローラにおいて延伸された。フィルムは、その後、1分あたり278mの速度で、95℃未満の温度で運転されるMDOにおいて延伸された。形成されたフィルムは、11.4gsmの坪量および1.14N/cmの破断時CD荷重を有していた。破断時の横方向伸長は446%であった。マシン方向において、破断時の荷重は3.16N/cmであった。マシン方向の破断時の伸長は、269%であった。不透明性は59.4%であり、TiO2は添加されなかった。水蒸気透過率(WVTR)は、9,083 H2O/24時間/m2であった。これらのデータ点は、材料の減少と共に、16gsm坪量に関する仕様を全て超えている。
実施例1に開示される方法を用いて、さらなるキャストフィルムが形成された。サンプルは、1%の加工助剤、ポリプロピレン、および以下に記載するフィラーを含み、組成物の残部がポリエチレンからなるものであった。フィルムの物理特性が表1に示される。別段の記載がない限り、フィルムは50%の炭酸カルシウムを含み、二酸化チタンを含まなかった。
12 キャスティング/ドローイングセクション
14 マシン方向配向(MDO)セクション
15 ウェブまたはフィルム
16 横方向嵌合ローラ(CDI)セクション
24 押出機
26 第1のギャップ
28 冷却ローラ
30 延伸ローラ
32 第2のギャップ
33 ニップ
34 スレーブローラ
35a、35b 加熱ローラ
36a、36b 延伸ローラ
37 冷却ローラ
38 テンションローラ
39 アイドルローラ
40、42 嵌合ローラ
T1、T2、T3 温度
V1、V2、V3 速度
Claims (21)
- 約15gsm以下の坪量、および少なくとも約500g H2O/24時間/m2の水蒸気透過率を有する、通気性を有する熱可塑性フィルムであって、破断時のCD荷重に対する破断時のMD荷重の比が約10未満であり、少なくとも約5gであるマシン方向ノッチのエルメンドルフ引裂強度、または少なくとも約15gであるマシン方向ノッチの台形引裂強度のうち少なくとも1つを有する、通気性を有する熱可塑性フィルム。
- 破断時のMD荷重が少なくとも約2.0N/cmであり、破断時のCD荷重が少なくとも約0.7N/cmである、請求項1に記載のフィルム。
- 少なくとも約50%の不透明性を有する、請求項1に記載のフィルム。
- 二酸化チタンを実質的に含まない、請求項3に記載のフィルム。
- オレフィンブロックコポリマーを含む、請求項1に記載のフィルム。
- オレフィンブロックコポリマーが、プロピレン系ポリマー組成物である、請求項5に記載のフィルム。
- オレフィンブロックコポリマーが、エチレン系ポリマー組成物である、請求項5に記載のフィルム。
- 約10%から約60%のポリプロピレンを含む、請求項1に記載のフィルム。
- 約30重量%から約60重量%のフィラーを含む、請求項1に記載のフィルム。
- 共押出された多層フィルムである、請求項1に記載のフィルム。
- 単層フィルムである、請求項1に記載のフィルム。
- 少なくとも200psiのヒドロヘッド圧を有する、請求項1に記載のフィルム。
- 通気性を有する熱可塑性フィルムであって、
約5gsmから約20gsmの坪量、少なくとも約500g H2O/24時間/m2の水蒸気透過率、少なくとも0.7N/cmである破断時のCD荷重、少なくとも約2.0N/cmである破断時のMD荷重、約1から約10である破断時のCD荷重に対する破断時のMD荷重の比、および少なくとも約5gであるマシン方向ノッチのエルメンドルフ引裂強度または少なくとも約15gであるマシン方向ノッチの台形引裂強度のうち少なくとも1つを有する、通気性を有する熱可塑性フィルム。 - 少なくとも約50%の不透明性を有する、請求項13に記載のフィルム。
- オレフィンブロックコポリマーを含む、請求項13に記載のフィルム。
- オレフィンブロックコポリマーが、プロピレン系ポリマー組成物である、請求項15に記載のフィルム。
- 約10%から約60%のポリプロピレンを含む、請求項13に記載のフィルム。
- 約30重量%から約60重量%のフィラーを含む、請求項13に記載のフィルム。
- 共押出された多層フィルムである、請求項13に記載のフィルム。
- a.約15gsm以下の坪量、および少なくとも約500g H2O/24時間/m2の水蒸気透過率を有する通気性の熱可塑性フィルムを含み、前記フィルムは、破断時のCD荷重に対する破断時のMD荷重の比が約10未満であり、少なくとも約5gであるマシン方向ノッチのエルメンドルフ引裂強度または少なくとも約15gであるマシン方向ノッチの台形引裂強度のうち少なくとも1つを有する第1の層であって、前記第1の層は表面を有する、第1の層と、
b.フィルム表面に取り付けられた基体と、
を含む積層体物品。 - 熱可塑性ポリマーを含む溶融ウェブを第1の冷却ローラ上に押し出す段階であって、前記第1の冷却ローラは第1の周速度V1で運転され、前記第1の冷却ローラは第1の温度T1を有し、温度T1は前記熱可塑性ポリマーの融点未満であり、それによって前記ウェブを冷却してフィルムを形成する、押し出す段階と;
前記第1の冷却ローラから下流にある延伸ローラに前記フィルムを進める段階であって、前記延伸ローラはV1よりも大きい第2の周速度V2で回転し、前記延伸ローラは温度T2を有する、フィルムを進める段階と、を含み、
前記延伸ローラは前記フィルムをマシン方向に延伸し、実質的に均一な厚みを有し、マシン方向の配向が限定され、破断時の横方向荷重に対する破断時のマシン方向荷重の比が約10未満であり、少なくとも5gであるマシン方向ノッチのエルメンドルフ引裂強度または少なくとも15gであるマシン方向ノッチの台形引裂強度のうち少なくとも1つを有するフィルムを製造する、
熱可塑性フィルム製品の製造方法。
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