JP5556040B2 - 耐圧熱可塑性ポリエステル容器及びその製造方法 - Google Patents
耐圧熱可塑性ポリエステル容器及びその製造方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2618—Moulds having screw-threaded mould walls
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
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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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/08—Injection moulding
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
- B29C2949/0772—Closure retaining means
- B29C2949/0773—Threads
- B29C2949/0774—Interrupted threads
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
- B29C2949/0777—Tamper-evident band retaining ring
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
- B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
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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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3032—Preforms or parisons made of several components having components being injected
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- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
- B29K2105/258—Tubular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Ceramic Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
しかしながら、炭酸飲料を内容物とする合成樹脂製容器について薄肉化の検討を進めていく過程で、薄肉化の程度が大きくなるにしたがって容器底部に著しい環境応力破壊が認められるようになってくることを本発明者らは見出した。
なお、プリフォーム10をブロー成形型BM内にセットする際には、必要に応じてプリフォーム10を加熱、軟化させてブロー成形が可能な状態としておく。
なお、図2は、射出成形型IMを型閉めした状態を示す説明図であり、図3は、射出成形を終えて型開きした状態を示す説明図である。通常、底型34側には、型閉めされて成形されたキャビティ30内に熱可塑性樹脂を充填するためのゲートが形成されるが、図2及び図3では、そのようなゲートの図示を省略している。
なお、パーティングラインPLは、射出成形型IMの分割面の数に応じて形成されるが、図示する例では、最も底部13側に形成されるパーティングラインPLだけを示している。
なお、パーティングラインPLの痕跡Vが上記領域に現れないようにするには、当該パーティングラインPLがプリフォーム10の底部13からできるだけ離れた位置に形成されるようにするのが好ましい。しかしながら、そのような型構造にすると、底型34をより深く切削しなければならず、型加工が困難となりコストも増大してしまう。このような型加工上の不具合とのバランスを考慮すると、上記長さhの上限を上記長さHの40%とするのが好ましい。
このことから、本発明は一段ブロー成形法により容器20をブロー成形する場合に好適である。
すなわち、従来にあっては、環境応力破壊を抑止するために容器底部の肉厚をある程度確保する必要があり、このため、本実施形態においてパーティングラインPLの痕跡Vが位置する部位に相当する部位の肉厚も0.35〜0.45mm程度となってしまい、容器を薄肉化するには限界があったが、本実施形態では、その必要がないため、環境応力破壊を抑止しながらも、さらなる容器の薄肉化を図ることが可能である。
図2及び図3に示すような射出成形型IMにおいて、プリフォーム10の底部13の先端から、最もプリフォーム10の底部13側に形成されるパーティングラインPLまでの軸方向に沿った長さhが、ネックリング14よりも下方に位置する部位の長さHの34.2%となるように、胴型33と底型34との分割面の位置を調整した。
成形された容器20の底部23には、パーティングラインPLの痕跡Vが認められず、当該痕跡Vは、図1に示す例と同様に、底部23の接地部位24を越えた容器側面側に位置していた。
図5及び図6に示すような射出成形型IMにおいて、プリフォーム110の底部113の先端から、最もプリフォーム110の底部113側に形成されるパーティングラインPLまでの軸方向に沿った長さh0が、ネックリング114よりも下方に位置する部位の長さH0の11.4%となるように、胴型133と底型134との分割面の位置を調整した以外は、実施例と同様にしてプリフォーム110を射出成形し、図4に示すような容量500mlの所定の容器形状の容器120を一段ブロー成形法により成形した。
成形された容器120の底部123には、図4に示す例と同様に、接地部位124よりも底部中心寄りとなる内側の領域に、パーティングラインPLの痕跡Vが認められた。
また、前述した実施形態では、プリフォームPLを射出成形で成形する例を示したが、圧縮成形によってプリフォームを成形する場合のように、前述した実施形態と同様に分割された型構造の成形型を用いることが考えられる他の成形手段によってプリフォームを成形する場合にも本発明を適用することができるのはいうまでもない。
11 口部
12 胴部
13 底部
20 容器
22 胴部
23 底部
24 接地部位
33 胴型
34 底型
IM 射出成形型
PL パーティングライン
Claims (3)
- プリフォームの胴部及び底部を含む外側面を成形する雌型が軸方向に沿って複数に分割された成形型を用いて成形され、前記外側面に周方向に沿って少なくとも一つのパーティングラインが形成された有底筒状のプリフォームを一段ブロー成形によって所定の容器形状に成形してなり、
最もプリフォームの底部側に形成された前記パーティングラインの痕跡が、成形された容器底部の接地部位を越えた容器側面側に位置するとともに、当該痕跡が位置する部位の肉厚が0.20〜0.30mmであることを特徴とする耐圧熱可塑性ポリエステル容器。 - 口部、胴部及び底部を有する有底筒状のプリフォームをブロー成形によって所定の容器形状の合成樹脂製容器に成形する合成樹脂製容器の製造方法であって、
前記プリフォームが、前記胴部及び前記底部を含む外側面を成形する雌型が軸方向に沿って複数に分割された成形型を用いて成形され、少なくとも一つのパーティングラインが前記外側面に周方向に沿って形成されているとともに、
前記底部の先端から最も前記底部側に形成された前記パーティングラインまでの軸方向に沿った長さが、前記口部を除く延伸される部位の軸方向に沿った長さの20〜40%であり、前記パーティングラインの痕跡が位置する部位の肉厚が0.20〜0.30mmとなるように、
前記プリフォームを一段ブロー成形によって所定の容器形状に成形することを特徴とする耐圧熱可塑性ポリエステル容器の製造方法。 - 前記プリフォームを一段ブロー成形法によって所定の容器形状に成形する請求項2に記載の耐圧熱可塑性ポリエステル容器の製造方法。
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JP2009079627A JP5556040B2 (ja) | 2009-03-27 | 2009-03-27 | 耐圧熱可塑性ポリエステル容器及びその製造方法 |
PCT/JP2010/001435 WO2010109775A1 (ja) | 2009-03-27 | 2010-03-03 | 合成樹脂製容器、プリフォーム、合成樹脂製容器の製造方法、及びプリフォーム成形型 |
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JP6121201B2 (ja) * | 2013-03-11 | 2017-04-26 | 株式会社クレハ | 環状凹部に厚肉の環状凸部を備える合成樹脂製ブロー成形多層容器 |
WO2016092723A1 (ja) * | 2014-12-09 | 2016-06-16 | 日本特殊陶業株式会社 | スパークプラグ用の絶縁体の製造方法、絶縁体、成形型 |
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JPH0735088B2 (ja) * | 1990-09-29 | 1995-04-19 | 日精エー・エス・ビー機械株式会社内 | パリソン射出成形装置 |
JPH0542586A (ja) * | 1991-08-09 | 1993-02-23 | Denki Kagaku Kogyo Kk | 二軸延伸ブロー成形方法 |
JP3174828B2 (ja) * | 1992-05-11 | 2001-06-11 | 株式会社吉野工業所 | 合成樹脂製壜体の重量分布判定方法 |
CA2256090C (en) * | 1998-12-14 | 2007-08-21 | Mold-Masters Limited | Injection molding apparatus having mold cores with reverse taper |
JP2003175923A (ja) * | 2001-09-28 | 2003-06-24 | Toyo Seikan Kaisha Ltd | 耐熱性ボトル |
JP2003103607A (ja) * | 2001-09-28 | 2003-04-09 | Toyo Seikan Kaisha Ltd | 耐熱性ボトルの底部構造 |
JP4935321B2 (ja) * | 2006-11-24 | 2012-05-23 | 大日本印刷株式会社 | プリフォーム圧縮成形用金型 |
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