JP5581565B2 - プラスチックボトル成形用プリフォーム - Google Patents
プラスチックボトル成形用プリフォーム Download PDFInfo
- Publication number
- JP5581565B2 JP5581565B2 JP2007215537A JP2007215537A JP5581565B2 JP 5581565 B2 JP5581565 B2 JP 5581565B2 JP 2007215537 A JP2007215537 A JP 2007215537A JP 2007215537 A JP2007215537 A JP 2007215537A JP 5581565 B2 JP5581565 B2 JP 5581565B2
- Authority
- JP
- Japan
- Prior art keywords
- preform
- support ring
- thickness
- plastic bottle
- length
- 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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- 229920003023 plastic Polymers 0.000 title claims description 49
- 239000004033 plastic Substances 0.000 title claims description 49
- 238000000465 moulding Methods 0.000 title claims description 27
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims 1
- 238000000071 blow moulding Methods 0.000 description 13
- -1 polypropylene Polymers 0.000 description 12
- 229920000139 polyethylene terephthalate Polymers 0.000 description 8
- 239000005020 polyethylene terephthalate Substances 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 229920001169 thermoplastic Polymers 0.000 description 5
- 239000004416 thermosoftening plastic Substances 0.000 description 5
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
Images
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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
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0014—Catalysts
-
- 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
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0032—Pigments, colouring agents or opacifiyng agents
-
- 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
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0044—Stabilisers, e.g. against oxydation, light or heat
-
- 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
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0047—Agents changing thermal characteristics
- B29K2105/005—Heat sensitisers or absorbers
-
- 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
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0065—Permeability to gases
- B29K2995/0067—Permeability to gases non-permeable
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Geometry (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、プラスチックボトルの軽量化を行う場合、プリフォームの最大肉厚は薄くならざるを得ない。プリフォームの最大肉厚が薄くなった場合、ブロー成形時に、プリフォームの最大肉厚部が延伸されやすくなり、ボトル胴部が肉薄になる。したがって、プリフォームの外形状を変更せずにプリフォームを軽量化する場合、プリフォームを薄くした場合にも延伸されやすいプリフォームのサポートリングの下のサポートリング下肉薄部及び底部の形状が求められる。このことは、重量を26gからさらに軽量化を図るとき、特に求められる。
但し、プリフォームを射出成形する際の金型構造上、抜きテーパ開始位置径を14.0mm以上にすることが望ましいことから、抜きテーパ開始位置径は、14.0〜26.0mmとすることが望ましい。
また、プリフォーム搬送時に、プリフォーム同士が重なり動かなくなることを防止するため、抜きテーパ開始径は、プリフォームの口栓部内径に対し、0.4mm以上大きいことが必要となる。
先ず140〜150℃に加熱した金型に本発明のプリフォーム1をセットし、プリフォーム1を延伸ロッドで上方に延伸させながらプリフォーム内にブロー口からエアブローする。その後、金型にてヒートセットするために数秒間保持し、成形したものの中にエアを吹き込み冷却し、同時にブロー口から排気される。次いで金型を開き製品を取り出す。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 7.5mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.2mm
ゲート部肉厚 2.5mm
プリフォーム重量 20.5g
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 5.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.50mm
プリフォーム重量 20.6g
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 10.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.35mm
プリフォーム重量 20.4g
ポリエチレンテレフタレートの射出成形により、図1に示す形状で、下記の寸法を有するプリフォームを製造した。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 3.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.50mm
プリフォーム重量 20.7g
ポリエチレンテレフタレートの射出成形により、図1に示す形状で、下記の寸法を有するプリフォームを製造した。
全長 85mm
胴径 22.2mm
サポートリング下肉薄部の長さ 12.0mm
サポートリング下肉薄部の厚さ 2.1mm
サポートリング下から抜きテーパ
開始位置までの長さ 14.4mm
胴部の厚さ 3.20mm
ゲート部肉厚 2.35mm
プリフォーム重量 20.3g
2 口栓部
3 サポートリング
4 サポートリング下肉薄部
5 胴部
6 底部
1a サポートリング下肉薄部の長さ
1b サポートリング下肉薄部の厚さ
1c サポートリング下から抜きテーパ開始位置までの長さ
1d 胴部の厚さ
1e 本発明のプリフォームの全長
1f 胴径
1g ゲート部肉厚
1h プリフォームの先端からサポートリング下までの長さ
1i サポートリング下の長さ
10 従来のプリフォーム
12 口栓部
13 サポートリング
14 サポートリング下肉薄部
15 胴部
16 底部
2a サポートリング下肉薄部の長さ
2b サポートリング下肉薄部の厚さ
2c サポートリング下から抜きテーパ開始位置までの長さ
2d 胴部の厚さ
2e 従来のプリフォームの全長
2f 従来のプリフォームの胴径
2g ゲート部肉厚
2h プリフォームの先端からサポートリング下までの長さ
2i サポートリング下の長さ
7 プラスチックボトル
Claims (3)
- 口栓部、サポートリング、胴部及び胴部の端部を閉塞する底部を備えるプラスチックボトル成形用プリフォームにおいて、
樹脂重量が、21.0g以下の、容量600ml以下のプラスチックボトル成形用プリフォームであって、
上記のプリフォームの全長を92.5mmより小さくし、
また、上記のプリフォームの胴径を24.0mmより小さくし、
そして、サポートリングの下に、サポートリング下から抜きテーパ開始位置(プラスチックボトルの肩部に相当する)までの長さ、12.5〜15.0mmの中で最小となる最小肉薄部からなる長さ5.0〜10.0mmのサポートリング下肉薄部を設け、
更に、胴部の肉厚は、上記のサポートリング下肉薄部の肉厚の1.52〜1.9倍の3.2〜4.0mmの厚さの範囲に形成し、
且つ、底部は、ゲート部のほうに向けて徐々に肉厚を薄くし、そして、上記のサポートリング下肉薄部の肉厚の0.85〜1.19倍の1.8〜2.5mmの厚さの範囲に形成したこと
を特徴とするプラスチックボトル成形用プリフォーム。 - プリフォームの全長は、85.0mmであり、胴径は、22.2mmであることを特徴とする請求項1に記載のプラスチックボトル成形用プリフォーム。
- サポートリング下肉薄部が、長さ7.5mmであることを特徴とする請求項1又は2に記載のプラスチックボトル成形用プリフォーム。
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