JP6095574B2 - フレアアプリケーションのための改良されたプリフォーム - Google Patents
フレアアプリケーションのための改良されたプリフォーム Download PDFInfo
- Publication number
- JP6095574B2 JP6095574B2 JP2013544876A JP2013544876A JP6095574B2 JP 6095574 B2 JP6095574 B2 JP 6095574B2 JP 2013544876 A JP2013544876 A JP 2013544876A JP 2013544876 A JP2013544876 A JP 2013544876A JP 6095574 B2 JP6095574 B2 JP 6095574B2
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- JP
- Japan
- Prior art keywords
- preform
- outer layer
- layer
- inner layer
- pet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
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Description
図4E、4Fおよび4Gは、後述するように、例示的なプリフォームに関連して使用される一方向弁の細部を示している。図4Eに示したように、第1の工程は、プリフォームの外層にスピン溶接で接着するためにPET(ポリエチレンテレフタレート)の射出成形であり、第2の工程は、例えば、PETに化学的に接着されない(が、図4Fに示したように、TPE(熱可塑性プラストマー)部分の底部に機械的に取付けられる)軟質TPEであってよい。軟質材料は、次の二つの理由から使用される:(1)弁の良好なシール性、および、(2)(例えば、TPE部分の下側に接着する)給気装置に対して良好なシール性をもたらす。図4Gに示したように、一方向弁は、スピン溶接、超音波溶接、接着剤封止などを用いて例示的なプリフォームに接着することができる。
図6〜図7は、その上部にバヨネット型接着で標準フレア装置と共に使用される例示的なPET/PPプリフォームの製造における二つの段階を示している。
図8〜図10は、本発明の例示的な実施形態による、例えば、PET/PETプリフォームなどの同一材料タイプから作られた例示的なプリフォームの製造における二つの段階を示している。図示した例示的なプリフォームは、「バヨネット」型ネック(分配ヘッドの「ラグ(突起)」すなわち水平突起部に嵌合するように内部容器の頂部に設けられた水平凹部、またはその逆)を有しているが、このプロセスは任意のネック型に同等に適用される。図8において、外層が、最初に、例えば、PETから成形される。その後、図9において、第2の層、即ち、内層が成形される前、とりわけ、二つの材料が同じである(よって同じ温度で溶融する傾向がある)ことから、非粘着性コーティングを外部プリフォームの内部表面に提供することができる。このような非粘着性コーティングは、例えば、噴霧され、オフセットされ、または、入手可能または希望される他の技術を用いて提供することができる。図8Aおよび図9Aはこれらのプリフォームの細部を示しており、図3A〜3Lの「プッシュピン」型層分離装置の変形を示している。プリフォームの内層と外層に対して同じ材料を有するかまたは同じ成形温度を有する異なる二つの材料を有する場合、最初に内部プリフォームを成形する方が有用であることに注目されたい。利点は、非粘着性コーティングが外部プリフォームより内部プリフォームの方がより簡単に的確に塗布することができることにある。
図11〜図14は、本発明の他の例示的な実施形態によるPET/PETプリフォームの製造における二つの段階を示している。ここで、図11に示したように、内層が最初に成形される。その後、図12において、第2の層、すなわち、外層が成形される前に、非粘着性コーティングが、内部プリフォームの外側表面へ噴霧されるか、そうでなければ、塗布、圧着または提供される。最終的に、図13に示したように、ここでも、PETから作られた外層が成形される。しかしながら、内層が最初に成形されており、図6〜図7における先に述べた場合のPET/PPプリフォームのように長形の突起円板を設けていないので、二つのプリフォームを共に取り付けるための変形手段が必要とされる。これについて、図14に例示した。
図20〜図22は、本発明の例示的な実施形態による、「ピストンフレア」型PET/PETプリフォームを2C(2成分射出)成形するための例示的なプロセスを示している。ピストンフレアシステムは、プリフォームの上部で内部プリフォームと外部プリフォームの間の接着を利用し、完成ボトルを得る。従って、変位媒体が層間に入ったとき、内層は、分配ヘッドに向かって押し上げられ、ピストンと極めて似た動作により内層自体が外部容器の壁に沿って上方移動するように折り畳まれる。ピストンフレアシステムはその開示内容が参照することで本明細書中に組み込まれている米国公開特許出願第2011/0024450号に記載されている。従って、「それ自体が折り畳まれるピストン効果」を達成するために両層の上部が互いが接着されることが望まれる場合、非粘着性コーティングは「ピストンフレア」プリフォームの底部に対してのみ必要とされる。
従って、図23〜図25は、本発明の例示的な実施形態による「ピストンフレア型バヨネット」タイプのPET/PETプリフォームを2C(2成分射出)成形するための他の例示的なプロセスを示している。ここで、図23に示したように、内部プリフォームが最初に成形され、その後、図24に示したように、非粘着性コーティングが内部プリフォームの外側に噴霧される。図25に示したように、その結果は、図20〜図22の実施例と同じであったが、図21に示したように、前回の場合の噴霧装置/ロボットの運動の自由度にもよるが、内部プリフォームの外側へ非粘着性コーティングを的確に付着する方が外部プリフォームの内側へ付着するより簡単であるのであれば、多くの場合、内部プリフォームの外側へ非粘着性コーティングを噴霧することが好ましいとされる。
図26A〜26Hは、本発明の例示的な実施形態による、一方向弁を有する例示的なプリフォームを示している。図26Aを参照するに、弁が取り付けられたプリフォームの断面図が示されており、同じ図が、図26A(b)にも再現され、図中、細部は「詳細A」と表記されている(これ以降の図においても同様に表記される)。図26A(c)および図26(d)は、底面を示すために垂直および水平に立てた状態のプリフォームを示す側面図である。同様に、図26A(e)は、断面を描くための二つの線A−AとB−Bを有する拡大底面図である。
図27A〜27Cは、本発明の例示的な実施形態による、例示的なプリフォームの内部容器に対する3ラグスナップオンネック仕上げを示している。三つのラグバヨネット仕上げは、場合によっては、シュラウド(覆い)が、分配ヘッドや噴霧器のヘッドを有する内部容器の頂部に固定されるのを可能にする。同様に、図27Bは、三つのラグバヨネット仕上げを異なる角度から見たときの図であり、図27Cは、三つのラグがネックの周囲に対して対称形ではなく非対称形で設けられている状態を示している。図27Aおよび図27Bのスナップオン式ネック仕上げの上面図である、図27Cに示したように、互いに約90°の角度を成す二つのラグが提供されており、各ラグはその中心線と図27Cの最左側に示した第3のラグの中心線との間で約135°を成すことがよく分かる。噴霧器ヘッドのこの3ラグ構成は本出願と同時係願されている、米国公開特許出願第2010/0018999号に記載されている。
3ラグバヨネットスナップオンネック仕上げとは対照的に、図27D〜27Gは、本発明の例示的な実施形態による、新しい4ラグバヨネット/スナップオンネック仕上げを示している。図27Dは、このような例示的な4ラグバヨネット/スナップオンネック仕上げを有する例示的なボトルを示す正面斜視図であり、図27Eは、同じボトルの異なる図を示しており、左画像は引込構造を有するラグ内を正面から見た図であり、右画像は標準ラグ(右側の垂直リブを設けこれに連結された水平棒を有する)を示している。図27Dを参照するに、4ラグ方式のボトル仕上げは、‐4バヨネット/スナップオンラグを有している。ラグの二つは、引き込みおよび引き出し案内リブを有している(このタイプのラグが図27Eの左画像に示されている)。本発明の例示的な実施形態において、引き込みおよび引き出し傾斜構造を有する四つのラグのうちの二つは十分に機能を果たすだけでなく、金型に二つのスライドがある場合、引き込みおよび引き出しリブを有する4ラグを作るのは不可能であるという成形上の理由からも適している。四つのスライドを必要とし複雑さを増すが、例えば、特別な理由がそれをベストチョイスとする場合には実行することができる。更に、図27Dにも示したように、上部が、例えば、4mmのボトル仕上げにおいて、リブの取り付けが不可能であり、さもなければ、内部シール表面にひけマークが生じる。密封を得るためには、キャップはカバーの頂部がネック部の上にぴったりとフィットする垂直な引込みスペースを必要とする。
上述したように、本発明の様々な例示的な実施形態おいて、プリフォームは、多くの場合、内部容器用と外部容器用に異なる材料を用いて作られる。しかしながら、これは、例えば、PETおよびPPなどの異なる材料がブロー成形を達成するために異なる最適ブロー温度範囲を有しているという技術的な問題も伴う。上記のように、成形された後、プリフォームは、フレア型ボトルに使用するための最終形状になるように空気が吹き込まれる(ブローされる)。したがって、内部プリフォームと外部プリフォームと両方が一緒にブローされる。両方の層:内層と外層が完全にそれらの最終形状になるようにブローされるためにこのブロープロセスを実行するためには両層のブロー温度が厳密に一致していることが必須である。
Claims (12)
- 液体物を収容し、当該液体物の排出に伴って内層が外層から剥離される二重容器用のプリフォームであって、
内層と外層とを有し、
前記内層と前記外層は前記プリフォームの底部と頂部において連結されており、
前記外層は底壁を有し、
前記外層の底壁は、該底壁から下方に伸びる環状隆起部と、前記環状隆起部に囲まれた凹部内にあって前記外層の底壁を貫通する空気取込孔を有し、
前記内層は底壁を有し、
前記内層の底壁は、該底壁から下方に伸びる突起を有し、
突起は、前記外層の前記空気取込孔にはめ込まれて前記空気取込孔を閉じており、
前記二重容器は、前記外層に対して前記内層が上方に移動することによって前記突起と前記空気取込孔との間に構成される隙間を備え、前記隙間を介して前記内層と前記外層との間に空気を取り込むことができる、ことを特徴とするプリフォーム。 - 前記内層と前記外層が同じ材料で作られている、ことを特徴とする請求1に記載のプリフォーム。
- 前記内層と前記外層がPETで作られている、ことを特徴とする請求2に記載のプリフォーム。
- 前記内層と前記外層が異なる材料で作られている、ことを特徴とする請求項1に記載のプリフォーム。
- 前記内層と前記外層の一方がPETで作られ、前記内層と前記外層の他方がポリオレフィンで作られている、ことを特徴とする請求項4に記載のプリフォーム。
- 前記外層の内面の少なくとも一部又は前記内層の外面の少なくとも一部に非粘着性コーティングを備えている、ことを特徴とする請求項1〜5のいずれか1項に記載のプリフォーム。
- 前記内層の底壁は開口を有し、前記外層は上方突起を有し、
前記外層の前記上方突起が前記内層の前記開口を貫通して閉じ、これにより、前記内層と前記外層が互いに接続されている、ことを特徴とする請求項1〜6のいずれか1項に記載のプリフォーム。 - 前記ネックが4つの突起を有するバヨネットを備えている、請求項1に記載のプリフォーム。
- 前記ラグのうちの二つが引込み構造を有している、請求項8に記載のプリフォーム。
- 前記突起は、カバーが取り付けられるときにカバーが回り過ぎるのを防止するように構成されているエンドリブを有している、請求項8に記載のプリフォーム。
- 前記突起のうちの二つ突起は戻り止めリブを有し、
前記戻り止めリブは、キャップやふたが外れないように前記ネックから更なる量だけ径方向外側に突出している、請求項10に記載のプリフォーム。 - 請求項1〜11のいずれか1項に記載のプリフォームの製造方法であって、
前記内層を構成する第1の材料について第1最適ブロー温度範囲を決定し、
前記外層を構成する第2の材料について第2最適ブロー温度範囲を決定し、
前記第1最適ブロー温度範囲と前記第2最適ブロー温度範囲がオーバーラップしない場合、
前記第1最適ブロー温度範囲と前記第2最適ブロー温度範囲がオーバーラップするように前記第1の材料及び前記第2の材料若しくはそれらの両方を調整し、
調整後、ブロー温度を前記第1最適ブロー温度範囲と前記第2最適ブロー温度範囲のうちの狭い方の中間温度に設定する、ことを特徴とするプリフォームの製造方法。
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