JP6190061B2 - 射出成形行程中の材料特性の変化を考慮する射出成形機及び方法 - Google Patents
射出成形行程中の材料特性の変化を考慮する射出成形機及び方法 Download PDFInfo
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- JP6190061B2 JP6190061B2 JP2016531902A JP2016531902A JP6190061B2 JP 6190061 B2 JP6190061 B2 JP 6190061B2 JP 2016531902 A JP2016531902 A JP 2016531902A JP 2016531902 A JP2016531902 A JP 2016531902A JP 6190061 B2 JP6190061 B2 JP 6190061B2
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- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76545—Flow rate
- B29C2945/76548—Flow rate derivative, change thereof
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76929—Controlling method
- B29C2945/76933—The operating conditions are corrected immediately, during the same phase or cycle
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76929—Controlling method
- B29C2945/76936—The operating conditions are corrected in the next phase or cycle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/12—Thermoplastic materials
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
様々な熱可塑性材料を、本開示の低定圧射出成形方法及び装置において使用することができる。一実施形態では、溶融熱可塑性材料は、ASTM D1238に準拠して温度約230℃、2.16kg重で測定した場合、約0.1g/10分〜約500g/10分のメルトフローインデックスで定義された粘度を有する。例えば、ポリプロピレンに対して、メルトフローインデックスは、約0.5g/10分〜約200g/10分の範囲にあり得る。別の好適なメルトフローインデックスは、約1g/10分〜約400g/10分、約10g/10分〜約300g/10分、約20g/10分〜約200g/10分、約30g/20分〜約100g/10分、約50g/10分〜約75g/10分、約0.1g/10分〜約1g/10分、又は約1g/10分〜約25g/10分を含む。材料のMFIは、成形品の用途及び使用方法に基づいて選択される。例えば、0.1g/10分〜5g/10分のMFIを有する熱可塑性材料は、射出ストレッチブロー成形(ISBM)用途用のプリフォームとしての使用に好適であり得る。5g/10分〜約50g/10分のMFIを有する熱可塑性材料は、物品を包装するためのキャップ及びクロージャとしての使用に好適であり得る。50g/10分〜約150g/10分のMFIを備える熱可塑性材料は、バケツ又はたらいの製造における使用に好適であり得る。150g/10分〜約500g/10分のMFIを備える熱可塑性材料は、薄板などの極めて高いL/T比を有する成形品に好適であり得る。かかる熱可塑性材料の製造者は、概して、その材料が41MPa(6000psi)を超過する、そして、しばしば41MPa(6000psi)を大きく超過する溶融圧を使用して射出成形されるべきであることを教示する。かかる熱可塑性材料の射出成形に関する従来の教示に反して、本開示の低定圧射出成形方法及び装置の実施形態は、かかる熱可塑性材料を使用し、103MPa(15,000psi)未満の、場合によっては、103MPa(15,000psi)をはるかに下回る溶融圧力で処理して、良質の射出成形部品を形成するのを有利に可能にする。
これらの充填時間の差を考慮し、サイクルステップ時間を調節することにより、より良い品質の部品を確実に製造する。
Claims (15)
- 溶融プラスチック材料の流動性の変動に適応するために、射出成形サイクルについてのステップ時間を自動的に調節する方法であって、
(a)第1の成形サイクルの間に、溶融プラスチック材料の第1のショットを金型キャビティの中に射出することを含む、方法において、
前記方法は、
(b)前記第1の射出成形サイクルの間に、前記溶融プラスチック材料が、前記金型キャビティの中の特定の場所における前記溶融プラスチック材料の流頭の存在を感知するように構成されている流頭センサに到達する第1の時間を測定することと、
(c)第1の比較結果を決定するために、前記第1の時間と所定時間とを比較することと、
(d)前記第1の比較結果に少なくとも部分的に基づいて、第1のステップ時間を決定することと、
(e)前記第1の成形サイクルの間に、前記第1の射出成形サイクルが前記第1のステップ時間を有するように、前記溶融プラスチック材料の第1のショットから射出圧力を除去することと、を更に含むことを特徴とする、方法。 - 既知の流動性を有する溶融プラスチック材料のショットが前記流頭センサに到達する時間に少なくとも部分的に基づいて、前記所定時間を決定することを含む、請求項1に記載の方法。
- 前記測定することは、前記第1の成形サイクルの開始から前記流頭センサが前記溶融プラスチック材料の前記流頭の到着を検出するまでの前記第1の時間を測定することを含む、請求項1又は2に記載の方法。
- 前記比較することは、前記第1の時間が前記所定時間を上回るか又は下回るかのいずれであるかを決定することを含む、請求項1〜3のいずれか一項に記載の方法。
- 前記第1の比較することは、第1の比較結果を決定するために前記第1の時間と前記所定時間とを比較することを含み、前記第1の比較結果は、前記第1の時間と前記所定時間との間の時間差である、請求項4に記載の方法。
- 前記第1の比較することは、前記第1の時間が前記所定時間を上回ることを決定することを含み、
前記除去することは、前記第1の成形サイクルが所定のステップ時間を上回る前記第1のステップ時間を有するように、前記溶融プラスチック材料の第1のショットから射出圧力を除去することを含む、請求項1〜5のいずれか一項に記載の方法。 - 前記第1の比較することは、前記第1の時間が前記所定時間を下回ることを決定することを含み、
前記除去することは、前記第1の成形サイクルが所定のステップ時間を下回る前記第1のステップ時間を有するように、前記溶融プラスチック材料の第1のショットから射出圧力を除去することを含む、請求項1〜5のいずれか一項に記載の方法。 - 前記第1の成形サイクルの間に、前記測定することは、前記溶融プラスチック材料が、変換器である前記流頭センサに到達する前記第1の時間を測定することを含む、請求項1〜7のいずれか一項に記載の方法。
- 前記第1の成形サイクルの間に、前記測定することは、前記溶融プラスチック材料が、前記流頭センサに到達する前記第1の時間を測定することを含み、前記流頭センサは、前記金型キャビティの端部から30%の範囲内に位置する、請求項1〜8のいずれか一項に記載の方法。
- 前記第1の射出成形サイクルの間に、前記測定することは、前記溶融プラスチック材料が前記流頭センサに到達する前記第1の時間を測定することを含み、前記流頭センサは、前記金型キャビティの内部での前記溶融プラスチック材料の流頭の存在を直接感知するように構成されたセンサである、請求項1〜9のいずれか一項に記載の方法。
- (f)前記第1の成形サイクルを含む射出成形行程における第2の成形サイクルの間に、溶融プラスチック材料の第2のショットを前記金型キャビティの中に射出することと、
(g)前記第2の射出成形サイクルの間に、前記溶融プラスチック材料が前記流頭センサに到達する第2の時間を測定することと、
(h)第2の比較結果を決定するために、前記第2の時間と前記所定時間とを比較することと、
(o)前記第2の比較結果に少なくとも部分的に基づいて、第2のステップ時間を決定することと、
(i)前記第2の成形サイクルの間に、前記第2の射出成形サイクルが前記第2のステップ時間を有するように、前記溶融プラスチック材料の第2のショットから射出圧力を除去することと、を更に含む、請求項1〜10のいずれか一項に記載の方法。 - 前記射出成形行程におけるそれぞれの成形サイクルについて、前記所定時間を使用する比較に基づいて、そのステップ時間を自動的に調節することを含む、請求項1〜11のいずれか一項に記載の方法。
- 前記射出成形行程におけるそれぞれの成形サイクルについて、前の成形サイクルにおいて前記溶融プラスチック材料のショットが前記流頭センサに到達する時間を使用する比較結果に基づいて、そのステップ時間を自動的に調節することを含む、請求項1〜12のいずれか一項に記載の方法。
- 請求項1〜13のいずれか一項に記載の方法を実行するように構成されたコントローラ。
- 請求項14に記載のコントローラを含む成形機。
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