JPH0464499B2 - - Google Patents
Info
- Publication number
- JPH0464499B2 JPH0464499B2 JP62040115A JP4011587A JPH0464499B2 JP H0464499 B2 JPH0464499 B2 JP H0464499B2 JP 62040115 A JP62040115 A JP 62040115A JP 4011587 A JP4011587 A JP 4011587A JP H0464499 B2 JPH0464499 B2 JP H0464499B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature control
- parison
- temperature
- bottle
- control pot
- 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 - Lifetime
Links
- 238000000071 blow moulding Methods 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 229920003002 synthetic resin Polymers 0.000 claims description 5
- 239000000057 synthetic resin Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
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
- 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
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
- B29C49/66055—Heating the article, e.g. for hot fill using special pressurizing during the heating, e.g. in order to control the shrinking
-
- 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
- B29C49/68—Ovens specially adapted for heating preforms or parisons
- B29C49/681—Ovens specially adapted for heating preforms or parisons using a conditioning receptacle, e.g. a cavity, e.g. having heated or cooled regions
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、ポリエチレンテレフタレート
（PET）のような合成樹脂材料からボトル等の中
空容器を延伸吹込成形する際に、パリソンを予備
加熱装置の温度調節ポツト内において加熱（又は
冷却）による温度調整を行ないボトル円周方向の
肉厚の調整をする温調装置に係り、特に偏平又は
角びんなどのPETボトルをブロー成形するのに
用いて好適なものである。Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for stretching and blow-molding a parison into a hollow container such as a bottle from a synthetic resin material such as polyethylene terephthalate (PET). It relates to a temperature control device that adjusts the wall thickness in the circumferential direction of a bottle by adjusting the temperature by heating (or cooling) inside the control pot, and is particularly suitable for use in blow molding PET bottles such as flat or square bottles. It is something.
（従来の技術）
射出成形したパリソンを延伸吹込成形によつて
中空成形品を成形する際に、延伸吹込成形の直前
にパリソンを所定温度まで昇温するため予備加熱
装置が用いられる。(Prior Art) When molding an injection-molded parison into a hollow molded product by stretch blow molding, a preheating device is used to raise the temperature of the parison to a predetermined temperature immediately before stretch blow molding.
そしてこの種予備加熱装置においては、多段に
分割しかつ電気ヒータや水又は油等の熱源により
個々に温度を変えられる温調ブロツクを有する温
調ポツトが用いられている。通常この温調ポツト
においてパリソン（プリフォーム）の内部へ加熱
ロツドよりパリソンの内面に低圧エアを入れ、予
備ブローすることによりパリソンの外面を温調ポ
ツトの内面へ密着させる。 In this type of preheating device, a temperature control pot is used which is divided into multiple stages and has a temperature control block whose temperature can be individually changed using a heat source such as an electric heater, water or oil. Usually, in this temperature-controlled pot, low-pressure air is introduced into the inside of the parison (preform) from a heating rod to the inner surface of the parison, and a preliminary blow is performed to bring the outer surface of the parison into close contact with the inner surface of the temperature-controlled pot.
（発明が解決しようとする問題点）
しかして通常温調ポツトの内面は円形状であつ
て、予備ブローされたパリソンは上述のように温
調ポツトの内壁面に密着するための円周上均一温
度となり、ボトル形状が偏平の場合や或いは一部
厚肉部を形成したいときに、所望の位置へ肉厚を
保持することが極めて困難である。(Problem to be Solved by the Invention) However, the inner surface of the temperature control pot is usually circular, and the pre-blown parison is uniform on the circumference so as to be in close contact with the inner wall surface of the temperature control pot as described above. It is extremely difficult to maintain the wall thickness at a desired position when the bottle shape is flat or when it is desired to form a partially thick walled portion.
この発明は上記のような不具合を解消し、平断
面が円形で通常の丸形びんなどの成形に用いられ
ている円筒形のパリソンを使用し、偏平又は角形
びんなどのブロー比が異なる合成樹脂製容器を、
容易にブロー成形できるようなボトル円周方向を
肉厚調整方法並びに装置を提供することをその目
的とする。 This invention solves the above-mentioned problems, and uses a cylindrical parison with a circular cross section, which is used for molding ordinary round bottles, and allows synthetic resins with different blowing ratios to be used for flat or square bottles. manufactured containers,
The object of the present invention is to provide a method and apparatus for adjusting the wall thickness in the circumferential direction of a bottle so that blow molding can be easily performed.
（問題点を解決するための手段及び作用）
この発明は上記の点に鑑みなされたものであつ
て、ポリエチレンテレフタレートのような合成樹
脂材料からボトル等の中空容器を延伸吹込成形す
る際にパリソンを予備加熱装置の温度調節ポツト
内において温度調整を行うようにした成形方法に
おいて、上記温度調節ポツトの内面を楕円状に形
成し、予備ブローすることにより、楕円の長径方
向は薄肉となり壁面に密着しているときに冷却が
早まつて円周上に温度差をつけて、ボトル等の所
望の箇所へ所望の肉厚を保つことができるように
したものである。(Means and effects for solving the problem) The present invention has been made in view of the above points, and it is possible to use a parison when stretch blow molding a hollow container such as a bottle from a synthetic resin material such as polyethylene terephthalate. In a molding method in which the temperature is adjusted in a temperature control pot of a preheating device, the inner surface of the temperature control pot is formed into an elliptical shape, and by preliminary blowing, the long axis direction of the ellipse becomes thinner and tightly adheres to the wall surface. When the bottle is in use, the bottle cools prematurely, creating a temperature difference around the circumference, making it possible to maintain the desired wall thickness at a desired location on the bottle or the like.
（実施例）
以下にこの発明の実施例を図面に基づいて説明
する。(Example) Examples of the present invention will be described below based on the drawings.
第１図は温調ポツトを示し、１は肉厚が均一の
ポリエチレンテレフタレートによる有底のパリソ
ンであり射出成形されたものである。２1，２2，
２3，２4，２5は多段の温調ブロツクを示し電気
ヒータ、水、油等の熱源により個々に温度を変え
ることのできる温調ブロツクであり、Ａ段目から
Ｅ段目までの５つのブロツクとして示されてい
る。図の場合は油加熱を用いたものを示してい
る。３はMCナイロンにより断熱された箇所を示
す。 FIG. 1 shows a temperature control pot, and 1 is a bottomed parison made of polyethylene terephthalate with a uniform wall thickness and is injection molded. 2 1 , 2 2 ,
2 3 , 2 4 , 2 5 are multi-stage temperature control blocks that can individually change the temperature using heat sources such as electric heaters, water, oil, etc. It is shown as one block. The figure shows one using oil heating. 3 shows the area insulated by MC nylon.
４は加熱ピース、５は加熱ロツド、６はカート
リツジヒータを示す。 4 is a heating piece, 5 is a heating rod, and 6 is a cartridge heater.
いま射出成形によつて取出されたPETパリソ
ンのほぼ均一の温度のものを第１図の温調ポツト
に入れて予備加熱を行うのであるが、パリソン内
部へ加熱ロツド５のＸ部で示した箇所よりパリソ
ン１の内面に約0.1〜9.9Kg／cm2の低圧エアー、最
適には2.0〜5.0Kg／cm2の低圧エアーを入れ、予備
ブローすることによつてパリソン外面を温調ポツ
トの温調ブロツク２の内面に密着させて予備加熱
が行われる。 Now, the PET parison taken out by injection molding at a substantially uniform temperature is placed in the temperature control pot shown in Fig. 1 and preheated. By introducing low-pressure air of about 0.1 to 9.9 Kg/ cm2 , optimally 2.0 to 5.0 Kg/ cm2 , into the inner surface of parison 1 and pre-blowing, the temperature of the outer surface of the parison can be controlled by the temperature control pot. Preheating is performed in close contact with the inner surface of the block 2.
そしてこの発明の重要な点は上記温調ポツトの
内面を第２図ａに示すように丸形状から楕円形に
変更したことであり、これによつてパリソンを予
備ブローすることによつて楕円の長径方向は第２
図ｂのW2に示すように薄肉となりパリソンが壁
面に密着しているときに冷却が早まり円周上に温
度差が形成される。 The important point of this invention is that the inner surface of the temperature control pot is changed from a round shape to an oval shape as shown in Fig. 2a, and by pre-blowing the parison, the oval shape can be changed. The major axis direction is the second
As shown by W 2 in Figure b, when the parison is thin and in close contact with the wall surface, cooling is accelerated and a temperature difference is formed on the circumference.
そしてこの温度差は予備ブローが解除された後
も保たれ、延伸ブロー成形時に低温部は延びにく
く、高温部が延び易くなる。 This temperature difference is maintained even after the preliminary blowing is canceled, and during stretch blow molding, the low temperature part is difficult to stretch, and the high temperature part is easy to stretch.
このようにしてボトル等の所望の箇所に所望の
肉厚が得られるものである。 In this way, a desired wall thickness can be obtained at a desired location on the bottle or the like.
以下に第２図に示した温調ポツトの内面形状を
もつ第１図の温調ポツトによつて下記の条件で試
験を行つたところ、パリソン（プリフォーム）温
度差において４℃の価が得られ長径方向に厚肉部
を形成することができた。 When a test was conducted under the following conditions using the temperature control pot shown in Figure 1, which has the inner surface shape of the temperature control pot shown in Figure 2, a value of 4°C was obtained for the parison (preform) temperature difference. It was possible to form a thick wall portion in the longitudinal direction.
（条件）
(1) 予備ブロー圧 ４Kg／cm2
(2) パリソン肉厚 ４mm
(3) Ａ−Ｂ＝４ｍ／ｍ （但しＡは30ｍ／ｍ）
(4) W1−W2＝0.5ｍ／ｍ
(5) 温調ポツトたて方向分割５段
(6) 楕円による温調ブロツク上から３段と４段目
の途中まで
（発明の効果）
この発明は以上詳述したようにして成るので、
温調ポツトの温調ブロツクの内面を丸形状から楕
円形状に変更したものを用いることによつてパリ
ソンの円周上温度差を生じ、ボトルの所望の位置
に所望の肉厚を保つことができ、平断面が円形の
円筒形パリソンを用いて偏平又は角形びんなどの
ブロー比が異なる合成樹脂製容器を容易にブロー
成形することができる。(Conditions) (1) Preliminary blow pressure 4Kg/cm 2 (2) Parison wall thickness 4mm (3) A-B=4m/m (However, A is 30m/m) (4) W 1 -W 2 =0.5m/ m (5) Temperature control pot vertically divided into 5 stages (6) Temperature control block formed by an ellipse from the top to the middle of the third and fourth stages (effects of the invention) Since this invention is constructed as described above in detail,
By changing the inner surface of the temperature control block of the temperature control pot from a round shape to an elliptical shape, a temperature difference is created around the circumference of the parison, and the desired wall thickness can be maintained at the desired position of the bottle. By using a cylindrical parison with a circular cross section, synthetic resin containers with different blow ratios, such as flat or square bottles, can be easily blow molded.
第１図はこの発明の方法を実施するに用いる温
調ポツトであり、第２図ａ，ｂは上記温調ポツト
と温調ブロツクの内面の形状とパリソンの温度差
変化の状態を図解的に示したもの。
１…パリソン、２1，２2，２3，２4，２5……温
調ブロツク、Ａ……長径方向の長さ、Ｂ……短径
方向の長さ。
Figure 1 shows a temperature control pot used to carry out the method of the present invention, and Figures 2a and 2b schematically show the shape of the inner surfaces of the temperature control pot and temperature control block, and the changes in temperature difference between the parisons. what was shown. 1... Parison, 2 1 , 2 2 , 2 3 , 2 4 , 2 5 ... Temperature control block, A... Length in the major axis direction, B... Length in the minor axis direction.
Claims (1)
脂材料からボトル等の中空容器を延伸吹込成形す
る際にパリソンを予備加熱装置の温度調節ポツト
内で温度調整を行うようにした成形方法におい
て、上記温度調節ポツトの温調ブロツクの内面を
楕円形状としたものを用い予備ブロー成形するこ
とを特徴とする、ボトル円周方向肉厚調整方法。 ２ 温度調節ポツトの温調ブロツクの内面を楕円
形状としたことを特徴とする、ボトル円周方向肉
厚調整装置。[Scope of Claims] 1. A molding method in which the temperature of the parison is adjusted in a temperature control pot of a preheating device when stretch blow molding a hollow container such as a bottle from a synthetic resin material such as polyethylene terephthalate, A method for adjusting wall thickness in the circumferential direction of a bottle, characterized in that preliminary blow molding is performed using a temperature control block of the temperature control pot having an elliptical inner surface. 2. A bottle circumferential wall thickness adjustment device, characterized in that the inner surface of the temperature control block of the temperature control pot is elliptical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62040115A JPS63207630A (en) | 1987-02-25 | 1987-02-25 | Method and device for thickness control in circumferential direction of bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62040115A JPS63207630A (en) | 1987-02-25 | 1987-02-25 | Method and device for thickness control in circumferential direction of bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63207630A JPS63207630A (en) | 1988-08-29 |
| JPH0464499B2 true JPH0464499B2 (en) | 1992-10-15 |
Family
ID=12571842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62040115A Granted JPS63207630A (en) | 1987-02-25 | 1987-02-25 | Method and device for thickness control in circumferential direction of bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63207630A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4656567B2 (en) * | 2005-06-24 | 2011-03-23 | 大成化工株式会社 | Preliminary temperature control die used for preliminary temperature control in blow molding molding process |
| DE102009022374A1 (en) | 2009-05-22 | 2010-11-25 | Krones Ag | Device for expanding plastic performs to plastic container, has blow mold which forms hollow space inside which plastic preforms are expanded, where blow mold has inner wall against which plastic preforms are expanded |
| DE102010044831A1 (en) | 2010-09-09 | 2012-03-15 | Krones Aktiengesellschaft | Apparatus for Treating Preforms - Quick Change |
| DE102010044833A1 (en) | 2010-09-09 | 2012-03-15 | Krones Aktiengesellschaft | Apparatus and method for producing oval plastic containers |
| DE102010044828A1 (en) | 2010-09-09 | 2012-03-15 | Krones Aktiengesellschaft | Device for handling of containers, particularly preforms, has transportation device for transporting container retaining device in direction and guiding unit for guiding of container retaining device in another direction |
| IT1402342B1 (en) * | 2010-10-12 | 2013-08-30 | Sipa Progettazione Automaz | PREFORM HEATING DEVICE IN THERMOPLASTIC MATERIAL. |
| GB2490532B (en) | 2011-05-05 | 2014-08-06 | Gr8 Eng Ltd | Heating preforms |
| CN111070637B (en) * | 2019-11-21 | 2022-02-18 | 浙江科力塑料机械有限公司 | One-step injection-blow molding die and molding process for deep-bottom PP square bottle |
-
1987
- 1987-02-25 JP JP62040115A patent/JPS63207630A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63207630A (en) | 1988-08-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |