JPH0761675B2 - Plastic bottle manufacturing method - Google Patents
Plastic bottle manufacturing methodInfo
- Publication number
- JPH0761675B2 JPH0761675B2 JP2158970A JP15897090A JPH0761675B2 JP H0761675 B2 JPH0761675 B2 JP H0761675B2 JP 2158970 A JP2158970 A JP 2158970A JP 15897090 A JP15897090 A JP 15897090A JP H0761675 B2 JPH0761675 B2 JP H0761675B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- mold
- bottle
- molded
- plastic bottle
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
-
- 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
-
- 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
-
- 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
- B29C49/6458—Thermal conditioning of preforms characterised by temperature differential tangentially, i.e. along circumference
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、ポリエチレンテレフタレート（以下PETと言
う）等の樹脂を素材とする有底筒状のパリソンを射出成
形によって成形し、この有底筒状のパリソンをダイレク
トあるいはコールドパリソンとした後加熱状態で成形用
金型内に挿入し、型締めし、延伸ブロー成形するプラス
チックボトルの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bottomed tubular parison made of a resin such as polyethylene terephthalate (hereinafter referred to as PET) as a raw material, which is molded by injection molding. The present invention relates to a method for producing a plastic bottle, in which a parison of the shape is formed into a direct or cold parison, which is then inserted into a molding die in a heated state, clamped, and stretch blow molded.
＜従来技術＞ 従来、この種の延伸ブロー成形で飲料、油等の液体を充
填するプラスチックボトルを成形するときには、プラス
チックボトルの胴部形状を滑らかな曲面、例えば、断面
が円あるいは楕円等の形状にした場合、延伸して肉厚を
小さく成形するので強度的に弱くなり、特には座屈強度
の低下が著しい。この点を解決するためボトルの胴部に
補強用の凹凸を設ける必要があった。<Prior Art> Conventionally, when a plastic bottle filled with a liquid such as a beverage or oil is molded by this kind of stretch blow molding, the body part of the plastic bottle has a smooth curved surface, for example, a cross section having a shape such as a circle or an ellipse. In the case of (1), since the film is stretched to form a small wall thickness, the strength is weakened, and particularly the buckling strength is significantly reduced. In order to solve this point, it was necessary to provide unevenness for reinforcement on the body of the bottle.
＜発明が解決しょうとする課題＞ 上記のようにボトル胴部に凹凸を形成すると、 （ｉ）金型を加工するとき複雑となりコスト高になる。<Problems to be Solved by the Invention> When the unevenness is formed on the bottle body as described above, (i) the mold becomes complicated and the cost becomes high.
（ii）ラベルの貼る位置が制限されてしまう。(Ii) The position where the label is attached is limited.
（iii）金型内でラベルを一体化する場合にボトルとラ
ベルの間に気泡が残ってしまう。(Iii) When the label is integrated in the mold, air bubbles remain between the bottle and the label.
等の問題があり、金型の凹凸を形成することなく同様の
強度がえられるボトルの製造方法が望まれていた。Therefore, there is a demand for a method for producing a bottle that can achieve the same strength without forming irregularities on the mold.
＜課題を解決するための手段＞ 本発明は、上記課題を解決したもので、射出成形した有
底筒状のパリソンを金型内で延伸ブロー成形するプラス
チックボトルの製造方法において、金型挿入前に前記パ
リソンを縦方向に分割した筋状に、延伸ブロー成形時の
金型温度より高い範囲で、高温部と低温部を有するよう
に温度調整し、このパリソンを金型内に挿入し、次いで
圧縮空気を吹き込んでブロー成形することにより前記低
温部に設定した部分が高温部に設定した部分より肉厚に
なるようにしたプラスチックボトルの製造方法を提供す
るものである。<Means for Solving the Problems> The present invention has been made to solve the above problems, and in a method for producing a plastic bottle in which an injection-molded bottomed tubular parison is stretch blow-molded in a mold, before inserting the mold. In the striped shape of the parison in the longitudinal direction, in a range higher than the mold temperature during stretch blow molding, the temperature is adjusted so as to have a high temperature part and a low temperature part, and this parison is inserted into the mold, and then Provided is a method for producing a plastic bottle in which compressed air is blown and blow molding is performed so that the portion set in the low temperature portion becomes thicker than the portion set in the high temperature portion.
＜作用＞ 上記方法において、成形終了後のプラスチックボトル
が、送入された圧縮空気により収縮が安定するまで冷却
した後、金型から取り出せば、表面が金型通りで、しか
も内側のみに肉厚変化のあるボトルが得られ、また冷却
途中で取り出せば、低温部に該当する部分が他の部分よ
り小さい曲率を有するボトルが得られ、共に強度的には
優れたプラスチックボトルが得られる。<Operation> In the above method, after the plastic bottle after molding is cooled by the compressed air that has been compressed until the shrinkage is stable, if it is taken out of the mold, the surface is as the mold is, and only the inner wall is thick. If a bottle having a change is obtained, and if taken out during cooling, a bottle having a curvature corresponding to the low temperature portion is smaller than other portions, and a plastic bottle excellent in strength is obtained.
＜実施例＞ 以下、本発明に係るプラスチックボトルの製造方法を実
施例により説明する。<Example> Hereinafter, a method for producing a plastic bottle according to the present invention will be described with reference to Examples.
まず、射出成形した直後の加熱された状態にあるパリソ
ンをそのまま利用するホットパリソン法にて説明する。First, a hot parison method in which a heated parison immediately after injection molding is used as it is will be described.
射出成形法によりPET樹脂にて有底筒上のパリソン
（１）を所定の大きさで成形し、射出成形機から取り出
したパリソン（１）に第１乃至第２図に示すような調温
棒（２）を挿入し、このパリソン（１）を温度調整す
る。この調温棒（２）は第２図の断面図に示されるよう
に大略円形でその周面に多数の（本実施例では４本）凸
条（３）が突設されていて、その凸条（３）の表面が前
記パリソン（１）の内面に接触するか、その近傍に位置
するような寸法に設定されていて、この調温棒（２）を
パリソン（１）に挿入すると、その凸条（３）と対面し
た部分のみ冷却され、他の部分より温度が下がる。ここ
で、凸条（３）に対面した部分を低温部（４）、その他
の部分を高温部（５）としたとき、温度調整としては、
後記するブロー成形時の金型温度が、60−90℃とするな
らば、上記パリソン（１）の高温部（５）は90−120℃
は、低温部（４）は60−90℃位に調節することが好まし
い。The parison (1) on the bottomed cylinder is molded in a predetermined size with PET resin by the injection molding method, and the parison (1) taken out from the injection molding machine has the temperature control rod as shown in FIGS. 1 and 2. Insert (2) and adjust the temperature of this parison (1). As shown in the sectional view of FIG. 2, the temperature control rod (2) has a substantially circular shape, and a large number (four in this embodiment) of convex ridges (3) are provided on the peripheral surface thereof, and the convex ridges are formed. The surface of the strip (3) is sized so as to be in contact with or in the vicinity of the inner surface of the parison (1), and when the temperature control rod (2) is inserted into the parison (1), Only the part facing the ridge (3) is cooled, and the temperature becomes lower than the other parts. Here, when the part facing the ridge (3) is the low temperature part (4) and the other part is the high temperature part (5), the temperature adjustment is as follows.
If the mold temperature during blow molding, which will be described later, is 60 to 90 ° C, the high temperature part (5) of the parison (1) is 90 to 120 ° C.
It is preferable that the low temperature part (4) is adjusted to about 60 to 90 ° C.
低温部（４）と高温部（５）とは縦筋形状に分布するよ
うになり、低温部（４）の位置はどこにに設けてもよい
が、一般にはパリソン（１）を等分割した位置に設ける
ことが好ましい。また、第３図に示すように胴部断面形
状が楕円のような場合には対応する金型（６）のキャビ
ティー面が一定の範囲（Ｘ）にあるように配置すること
が好ましい。The low-temperature part (4) and the high-temperature part (5) are distributed in a vertical streak shape, and the low-temperature part (4) may be located anywhere, but generally the parison (1) is divided into equal parts. It is preferable to provide it. Further, as shown in FIG. 3, when the sectional shape of the body is elliptical, it is preferable that the cavity surface of the corresponding mold (6) is arranged within a certain range (X).
次に、このように調整したパリソン（１）は金型（６）
内に挿入し、通常の延伸ブロー成形法と同様にロッド
（図示せず）で延伸、次いで圧縮空気を送り込んでブロ
ー成形する。Next, the parison (1) adjusted in this way is the mold (6)
It is inserted into the inside and stretched by a rod (not shown) as in the ordinary stretch blow molding method, and then blown by blown with compressed air.
ここで、成形したボトルの冷却方法としては、二つの方
法があり、まず送り込まれた圧縮空気によって胴部の収
縮が安定するまで冷却した画、金型から取り出す方法で
あり、ここでは第４図に示す様にボトル（10）外面がか
なずた内面に合致するような曲率が一定で、且つ前記パ
リソンの状態で低温部（４）であったところは圧縮空気
による伸びが小さいので肉厚部（11）と、高温部（５）
に対応するところが肉薄部（12）とが縦筋状になるよう
なボトル（10）が得られる。Here, there are two methods for cooling the molded bottle. First, there is a method in which the image is cooled until the contraction of the body is stabilized by the compressed air sent in, and the method is taken out from the mold. As shown in Fig. 7, the outer surface of the bottle (10) has a constant curvature so as to match the inner surface of the bottle (10), and the low temperature part (4) in the parison has a small expansion due to compressed air, so the thick part (11) and high temperature part (5)
A bottle (10) having a thin portion (12) and a vertical streak portion corresponding to is obtained.
他方、冷却途中でボトル（20）を取り出すと、肉薄部
（21）と肉厚部（22）の収縮率が異なるので、第５図の
ように、曲率の小さい部分が存在して肉厚部との相乗効
果出その部分が補強される結果になる。On the other hand, when the bottle (20) is taken out during cooling, the thin part (21) and the thick part (22) have different shrinkage rates, so that there is a part with a small curvature as shown in FIG. The synergistic effect with and that part will be reinforced.
尚、上記説明ではホットパリソン法で説明したがコール
ドリソン法を使うときには、予め成形されたパリソン
（プリフォーム）を調温装置等により所定の温度まで加
熱した後、上記ホットパリソン法と同様に調温棒を加熱
されたパリソンに挿入して部分的に低温部と高温部とに
調整し、前記実施例と同じ方法を用いて延伸ブロー成形
すればよい。Although the hot parison method is used in the above description, when using the cold drisson method, the pre-molded parison (preform) is heated to a predetermined temperature by a temperature controller or the like and then adjusted in the same manner as the hot parison method. A hot rod may be inserted into a heated parison to partially adjust the temperature to a low temperature part and a high temperature part, and stretch blow molding may be performed using the same method as in the above-mentioned embodiment.
上記実施例では断面が畧楕円形の偏平ボトルを製造する
方法であったが、円筒形、角筒形など種々の形状に対応
することが可能である。Although the method of manufacturing the flat bottle having the elliptical cross section in the above-described embodiment, various shapes such as a cylindrical shape and a square tube shape can be applied.
＜効果＞ 本発明は上記の如き構成であるため、成形金型として
は、凹凸を有するような複雑な形状にすることがなく、
成形されたボトルに縦筋状の肉厚部乃至、曲率の小さい
部分を設けて強度を高めるので、横方向からの圧力、即
ち飲料のようにホット充填されるボトルの凹み防止や、
あるいはキャップの打栓時の座屈強度にも耐えるボトル
が製造可能となり、またラベルを貼る場合には、従来の
ように外面に凹凸を形成していないため、成形後、ある
いは金型内で成形と同時り貼るときでも、容易に且つ綺
麗に貼ることができる等実用上優れたプラスチックボト
ルの製造方法である。<Effect> Since the present invention has the above-described configuration, the molding die does not have a complicated shape having irregularities,
A vertical streak-shaped wall thickness portion or a portion with a small curvature is provided to the molded bottle to increase the strength, so pressure from the lateral direction, that is, prevention of dents in bottles that are hot-filled like beverages,
Alternatively, it will be possible to manufacture bottles that will withstand the buckling strength of the cap when plugged, and when attaching a label, there is no unevenness on the outer surface as in the past, so it can be molded after molding or in the mold. It is a method for producing a plastic bottle that is practically excellent in that it can be easily and neatly attached even when it is attached at the same time.
第１図は本発明のプラスチックボトルの製造方法に係る
パリソンを温度調整する工程を示す説明図、第２図は第
１図の横断面を示す説明図、第３図はボトル成形時の横
断面説明図、第４図は成形されたボトルの一実施例を示
す横断面説明図、第５図は他の実施例により成形された
ボトルの横断面説明図である。 （１）……パリソン、（２）……温調棒 （３）……凸条、（４）……低温部 （５）……高温部、（６）……金型 （10）（20）……ボトル （11）（21）……肉薄部 （12）（23）………肉厚部FIG. 1 is an explanatory view showing a step of adjusting the temperature of a parison according to the method for producing a plastic bottle of the present invention, FIG. 2 is an explanatory view showing a cross section of FIG. 1, and FIG. 3 is a cross section of a bottle during molding. Explanatory drawing, FIG. 4 is a cross-sectional explanatory view showing an embodiment of a molded bottle, and FIG. 5 is a cross-sectional explanatory view of a bottle molded according to another embodiment. (1) …… Parison, (2) …… Temperature control rod (3) …… Convex strip, (4) …… Low temperature part (5) …… High temperature part, (6) …… Mold (10) (20 ) …… Bottle (11) (21) …… Thin portion (12) (23) ………… Thick portion
Claims (1)
で延伸ブロー成形するプラスチックボトルの製造方法に
おいて、金型挿入前に前記パリソンを縦方向に分割した
筋状に、延伸ブロー成形時の金型温度より高い範囲で、
高温部と低温部を有するように温度調整し、このパリソ
ンを金型内に挿入し、次いで圧縮空気を吹き込んでブロ
ー成形することにより前記低温部に設定した部分が高温
部に設定した部分より肉厚になるようにしたプラスチッ
クボトルの製造方法。1. A method for producing a plastic bottle in which an injection-molded bottomed tubular parison is stretch blow-molded in a mold, wherein the parison is stretch-blow-molded into a linearly divided line before the mold is inserted. In the range higher than the mold temperature at that time,
Adjust the temperature so that it has a high temperature part and a low temperature part, insert this parison into the mold, and then blow molding by blowing compressed air so that the part set to the low temperature part is more meat than the part set to the high temperature part. A method for manufacturing thick plastic bottles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2158970A JPH0761675B2 (en) | 1990-06-18 | 1990-06-18 | Plastic bottle manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2158970A JPH0761675B2 (en) | 1990-06-18 | 1990-06-18 | Plastic bottle manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0449023A JPH0449023A (en) | 1992-02-18 |
| JPH0761675B2 true JPH0761675B2 (en) | 1995-07-05 |
Family
ID=15683355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2158970A Expired - Fee Related JPH0761675B2 (en) | 1990-06-18 | 1990-06-18 | Plastic bottle manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761675B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2703944B1 (en) * | 1993-04-15 | 1995-06-23 | Sidel Sa | Method and installation for the heat treatment of the body of a preform of thermoplastic material. |
| US5853775A (en) * | 1997-12-05 | 1998-12-29 | Electra Form, Inc. | Non-Round container blow molding apparatus |
| EP1260339B1 (en) * | 1998-03-31 | 2004-11-03 | Husky Injection Molding Systems Ltd. | Preform post-mold cooling method and apparatus, and cooling pin |
| ITPN20010009A1 (en) * | 2001-02-07 | 2002-08-07 | Sipa Spa | PROCEDURE FOR THE PRODUCTION OF PET CONTAINERS WITH OUT-OF-CENTER MOUTH |
| DE10144537B4 (en) | 2001-09-11 | 2010-07-22 | Krones Ag | Apparatus and method for tempering preforms |
| ITMI20012231A1 (en) * | 2001-10-24 | 2003-04-24 | Magic Mp Spa | BLOWER FORMING MACHINE FOR CONTAINERS FROM COLD PREFORMS WITH THE CONDITIONING STAGE OF THE SAME |
| JP4052055B2 (en) * | 2002-08-06 | 2008-02-27 | 東洋製罐株式会社 | Stretch blow molding method for plastic bottle containers |
| JP5176185B2 (en) * | 2008-05-30 | 2013-04-03 | 株式会社吉野工業所 | Stretch blow molded container and molding method thereof. |
| CN114206584B (en) * | 2019-08-08 | 2024-01-12 | 日精Asb机械株式会社 | Mold unit for cooling resin molded article, blow molding device, injection molding device, and method |
| US20220274311A1 (en) * | 2019-08-08 | 2022-09-01 | Nissei Asb Machine Co., Ltd. | Die unit, blow molding device, and blow molding method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843308B2 (en) * | 1976-02-09 | 1983-09-26 | 株式会社吉野工業所 | Biaxially stretched container |
-
1990
- 1990-06-18 JP JP2158970A patent/JPH0761675B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0449023A (en) | 1992-02-18 |
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