JP2018533496A - 可撓性付属部を可撓性フィルムにシールするためのプロセス - Google Patents
可撓性付属部を可撓性フィルムにシールするためのプロセス Download PDFInfo
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- JP2018533496A JP2018533496A JP2017558026A JP2017558026A JP2018533496A JP 2018533496 A JP2018533496 A JP 2018533496A JP 2017558026 A JP2017558026 A JP 2017558026A JP 2017558026 A JP2017558026 A JP 2017558026A JP 2018533496 A JP2018533496 A JP 2018533496A
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- ethylene
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- multilayer film
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/133—Fin-type joints, the parts to be joined being flexible
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
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- Engineering & Computer Science (AREA)
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- Compositions Of Macromolecular Compounds (AREA)
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Abstract
Description
本明細書における元素周期表に対する全ての言及は、CRC Press,Inc.,2003によって出版され、著作権所有される元素周期表を指すものとする。また、群に対するいかなる言及も、群を番号付けするためのIUPACシステムを使用する、この元素周期表において反映される群に対するものとする。反対のことが述べられているか、文脈から暗に示されているか、または本技術分野で慣習的ではない限り、全ての部及びパーセントは、重量に基づく。米国特許慣行の目的で、本明細書において言及されるいかなる特許、特許出願、または出版物の内容も、特に合成技術の開示、定義(本明細書に提供されるいかなる定義とも矛盾しない程度まで)、及び本技術分野の一般知識に関して、それらの全体がこれにより参照によって組み込まれる(またはそれらの同等の米国版が参照によって同様に組み込まれる)。
(i)前面、
(ii)前面から一定距離(x)後ろの凹面であって、第1の端部及び対向する第2の端部を有する、凹面、ならびに
(iii)各対向する端部の湾曲面であって、前面と凹面との間に延在し、各々が距離(x)以上の曲率半径(Rc)を有する、湾曲面、を含む、位置付けることと、
本プロセスは、付属部10を提供することを含む。付属部10は、図1に示されるようにベース12及び頂部14を有する。付属部10は、1つ以上のポリマー材料(すなわち、混成物)から作製されてもよい。ベース12は、エチレン/α−オレフィンマルチブロックコポリマーを含有するか、またはそれから別の様式で形成される。ベース12は、エチレン/α−オレフィンマルチブロックコポリマーと1つ以上の追加のポリマーとから成るポリマー混成物から作製されてもよい。エチレン/α−オレフィンマルチブロックコポリマーと混成するための好適な材料の非限定的な例としては、低密度ポリエチレン(LDPE)、直鎖低密度ポリエチレン(LLDPE)、高密度ポリエチレン(HDPE)、エチレン酢酸ビニル(EVA)、エチレンメチルアクリレート(EMA)、エチレンアクリル酸コポリマー(EAA)、プロピレンホモポリマー、プロピレンコポリマー、プロピレンインパクトコポリマーが挙げられる。
いくつかの実施形態において、エチレン/α−オレフィンマルチブロックコポリマーは、以下の式によって表すことができる。
AAA−AA−BBB−BB
(B)約1.7〜約3.5のMw/Mnを有し、かつJ/gでの融解熱ΔH、及び最高DSCピークと最高結晶化分析分別(「CRYSTAF」)ピークとの間の温度差として定義される摂氏度でのデルタ量ΔTを特徴とし、ここで、ΔT及びΔHの数値は、以下の関係を有する。
ゼロ超〜最大130J/gのΔHについては、
(C)エチレン/α−オレフィンインターポリマーの圧縮成形フィルムで測定される、300パーセントの歪み及び1回のサイクルでの、パーセントでの弾性回復Reを有し、かつグラム/立方センチメートルでの密度dを有し、ここで、Re及びdの数値は、エチレン/α−オレフィンインターポリマーが架橋相を実質的に含まないときに、以下の関係を満たす。
(D)TREFを使用して分別されるときに40℃〜130℃の間で溶出する分子量分画を有し、分画が、同一の温度間で溶出する同等のランダムエチレンインターポリマー分画のモルコモノマー含有量よりも、少なくとも5パーセント高いモルコモノマー含有量を有するという点を特徴とし、ここで、該同等のランダムエチレンインターポリマーは、同一のコモノマーを有し、エチレン/α−オレフィンインターポリマーのメルトインデックス、密度、及び(ポリマー全体に基づく)モルコモノマー含有量の10パーセント以内の、メルトインデックス、密度、及びモルコモノマー含有量を有する、または
(E)25℃での貯蔵弾性率G’(25℃)及び100℃での貯蔵弾性率G’(100℃)を有し、ここで、G’(25℃)対G’(100℃)の比率は、約1:1〜約9:1の範囲内である。
また
Tmは、80℃、または85℃、または90℃から、95、または99℃、または100℃、または105℃から、110℃、または115℃、または120℃、または125℃までである。
本プロセスは、付属部ベースを2つの対向する複層フィルム間に配置することを含む。ベース12は、図2に示されるように、2つの対向する複層フィルム、複層フィルム16と複層フィルム18との間に配置されるか、または別の様式で位置付けられる。各複層フィルムは、オレフィン系ポリマーを含有するそれぞれのシール層を有する。
本プロセスは、ベース及び対向する複層フィルムを、対向する加熱されたシールバー間に位置付けることを含む。図2は、複層フィルム16と複層フィルム18との間に位置するベース12を示す。複層フィルム16は、シール層16a及び最外層16bを有する。同様に、複層フィルム18は、シール層18a及び最外層18bを有する。図2は2つの層を有する各複層フィルム16、18を示すが、各複層フィルムが2つ、または3つ、または4つ、または5つ、または6つから、7つ、または8つ、または9つ、または10、または11、またはそれ以上の層を有し得ることが理解される。ベース12は、複層フィルム16と複層フィルム18との間に位置するか、または別の様式で「挟まれる」。フィルム−ベース−フィルムサンドイッチは、フィルム−ベース−フィルムサンドイッチが対向するシールバー、つまりシールバー20とシールバー22との間に位置付けられる熱シール装置19(図3)内に位置する。シールバー20は、シールバー22に対向する。熱シール装置19は、熱シール手順を実行するために、(i)シールバーの加熱、(ii)シールバー20、22を互いから接離可能にさせるのに好適な構造及び機構を含む。
本プロセスは、溶接されたベース42をコールドシールする任意のステップを含み得る。溶接されたベース42は、シールバー20、22間の適所に残る。シールバー20、22は、溶接されたベース42を閉鎖し、圧縮する。コールドシールプロセスは、シールバー20、22が溶接されたベース上で閉鎖し、それを圧縮する熱シールステップと同様である。コールドシールステップでは、シールバー20、22は、熱シールステップでの温度より低い温度にある。
一実施形態において、本プロセスは、溶接されたベースをインパルスシールすることを含む。インパルス熱シール装置は典型的に2つの加熱要素(1つは頂部バー上、1つは底部バー上)を有し、加熱要素は典型的にシールバーと離型フィルムまたはファブリックとの間に配置されるニクロム(ニッケルクロム合金)から作製される。
本プロセスは、可撓性容器を形成することを含む。対向する複層フィルム16、18は、互いに重ねられ、図10に示されるように共通の外周縁50を形成する。本プロセスは、複層フィルム16、18を共通の外周縁に沿ってシールし、可撓性容器52を形成することを含む。共通の外周縁50に沿ったシールの形成は、熱シールステップの前、その間、またはその後に発生し得る。本プロセスは、ベース12と複層フィルム16及び18との間の密封シール54、ならびに複層フィルム16、18間の密封シールを形成する。
図1に示されるような円柱状のベースを有す付属部は、以下のポリマー、つまり(i)The Dow Chemical Companyより入手可能なInfuse(商標)9817エチレン/オクテンマルチブロックコポリマー、(ii)高密度ポリエチレン、(iii)The Dow Chemical Companyより入手可能なVersify(商標)4301プロピレン/エチレンランダムコポリマーを別個に射出成形することによって調製される。金型はカヌー形ベースの付属部の金型を改造することによって構築され、ベース部分を直管部に置換する。ベースは0.8mmの壁厚Wt及び12mmの内径を有し、これは、平坦な状態まで圧縮されたときに20.1mmの圧縮されたベースの長さ(CBL)と一致する。ポリマーの特性を下の表2に提供する。
シールバー20、22の設計を有する3セット(組)の熱シールバーは、表3に示される寸法で製作される。
各付属部は、シール層が互いに向き合った状態で、(表1の)フィルム1の2つの対向するフィルム間に配置する。
A.DMDA8920及びVERSIFY4301から作製され、表4の熱シール条件に供した付属部は、シールできなかった。DMDA8920及びVERSIFY4301の付属部は、不適切にシールされた縁及び重度の漏出を呈する。
Claims (11)
- A.壁厚(Tw)を有するベースであって、エチレン/α−オレフィンマルチブロックコポリマーを含むベースを有する付属部を提供することと、
B.前記ベースを2つの対向する複層フィルム間に配置することであって、各複層フィルムが、オレフィン系ポリマーを含むそれぞれのシール層を有する、配置することと、
C.前記ベース及び対向する複層フィルムを対向するシールバー間に位置付けることであって、各シールバーが、
(i)前面、
(ii)前記前面から一定距離(x)後ろの凹面であって、第1の端部及び対向する第2の端部を有する、凹面、ならびに
(iii)各対向する端部の湾曲面であって、前記前面と前記凹面との間に延在し、各々が距離(x)以上の曲率半径(Rc)を有する、湾曲面を含む、位置付けることと、
D.前記ベースを各複層フィルムに熱シールすることと、を含む、プロセス。 - 下の式(1)を満たすシールバーを提供することを含む、請求項1に記載のプロセス。
- 前記ベースには、115℃〜125℃の融解温度Tm1を有するエチレン/α−オレフィンマルチブロックコポリマーを選択することと、
前記複層フィルムの前記シール層には、Tm1よりも10℃〜40℃低い融点Tm2を有するオレフィン系ポリマーを選択することと、を含む、請求項1に記載のプロセス。 - 前記対向するシールバーによって、前記ベースを前記エチレン/α−オレフィンマルチブロックコポリマーの少なくとも軟化点の温度まで加熱することと、
前記ベースを圧縮することと、
前記加熱及び前記圧縮によって、コーキングを形成することであって、前記コーキングが、前記シール層の融解ポリオレフィン、前記ベースの融解エチレン/α−オレフィンマルチブロックコポリマー、及びこれらの組み合わせから成る群から選択される材料を含む、形成することと、を含む、請求項1に記載のプロセス。 - 各凹面が、長さを有し、前記プロセスが、前記加熱されたシールバー間で前記ベースを圧縮することと、
前記凹面の長さより長い圧縮されたベースの長さ(CBL)を有する圧縮されたベースを形成することと、を含む、請求項4に記載のプロセス。 - 前記圧縮されたベースが、対向する平坦化されたベース端部を有し、前記プロセスが、
前記対向する湾曲面によって、前記コーキングを、前記平坦化されたベース端部でピンチングすることと、
原位置ウィングレットを形成することと、を含む、請求項5に記載のプロセス。 - 前記ベースから前記シールバーを後退させることと、
前記ベースが反跳し、楕円形断面形状を形成することを可能にすることと、を含む、請求項1に記載のプロセス。 - 前記熱シールが、溶接されたベースを形成し、前記プロセスが、
E.前記溶接されたベースを前記対向するシールバー間に位置付けることと、
F.前記溶接されたベースをコールドシールすることと、を含む、請求項1に記載のプロセス。 - 前記熱シールが、溶接されたベースを形成し、前記プロセスが、前記溶接されたベースをインパルスシールすることを含む、請求項1に記載のプロセス。
- 前記ベースと前記複層フィルムとの間に密封シールを形成することを含む、請求項1に記載のプロセス。
- 前記対向する複層フィルムが、互いに重ねられ、共通の外周縁を形成し、
前記複層フィルムを前記共通の外周縁に沿ってシールし、
可撓性容器を形成する、請求項1に記載のプロセス。
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