【発明の詳細な説明】 （産業上の利用分野） 本発明はプラスチックボトルの製造方法に関する。The present invention relates to a method for producing a plastic bottle.
（従来の技術） 従来、清涼飲料水のプラスチックボトルには、炭酸飲
料に含まれる炭酸ガスの圧力に対する耐久性を向上させ
るために、ボトルの底部をボトルの内側に突出させ、さ
らに、ボトルの底部中央から底部の周囲に放射状に延び
るすじ状の突起を形成し、これによって、炭酸ガスの圧
力に対抗させたものが知られている。(Prior Art) Conventionally, in plastic bottles of soft drinks, in order to improve the durability against the pressure of carbon dioxide contained in carbonated drinks, the bottom of the bottle is projected inside the bottle, and the bottom of the bottle is further formed. It is known to form a streak-like projection extending radially from the center to the periphery of the bottom, thereby opposing the pressure of carbon dioxide gas.
これらのプラスチックボトルの多くは、ブロー成形法
によって製造されている。この成形金型のキャビティの
ボトルの底部を形成する部分には、底部の中央から底部
の周囲に向かって放射状に延びるスジ状の突起が形成さ
れており、筒状のパリソン内に圧縮空気を吹き込んでプ
ラスチックボトルを成形する場合に、この突起によって
プラスチックボトルの底部にボトルの内側に突出する放
射状の突起を形成するようにしている。Many of these plastic bottles are manufactured by a blow molding method. A streak-like projection extending radially from the center of the bottom toward the periphery of the bottom is formed in a portion of the cavity of the molding die that forms the bottom of the bottle, and compressed air is blown into the cylindrical parison. When a plastic bottle is formed by the method described above, the protrusion forms a radial protrusion protruding inside the bottle at the bottom of the plastic bottle.
（発明が解決しようとする課題） しかしながら、このようなプラスチックボトルの製造
方法によると、金型の型締め後に、ボトルの成形原料た
るパリソン内へ圧縮空気を注入すると、パリソン上下の
中間部に位置する筒上部が延びてキャビティの壁面に密
着するが、キャビティのボトルの底部を形成する部位で
はパリソンが十分に延伸されないために、プラスチック
ボトルの底部が脆くなりがちであり、プラスチックボト
ルの落下に対する耐久性向上が難しいという課題があっ
た。(Problems to be Solved by the Invention) However, according to such a method for manufacturing a plastic bottle, when compressed air is injected into a parison, which is a molding material of the bottle, after the mold is clamped, the plastic bottle is positioned at an upper and lower intermediate part of the parison. The bottom of the plastic bottle tends to become brittle because the parison is not sufficiently stretched at the part that forms the bottom of the cavity bottle, and the bottom of the plastic bottle tends to become brittle. There is a problem that it is difficult to improve the performance.
（課題を解決するための手段） 上記課題を解決するために、本発明にかかるプラスチ
ックボトルの製造装置及び製造方法は特許請求の範囲
（１）、（２）に記載した通りの特徴を有する。(Means for Solving the Problems) In order to solve the above problems, the apparatus and method for manufacturing a plastic bottle according to the present invention have the features as described in claims (1) and (2).
（作用） 本発明にかかるプラスチックボトルの製造装置によれ
ば、型締めした金型内のパリソンに空気供給路から圧縮
空気を注入してキャビティ内にプラスチックボトルの成
形体を形成した後、底部延伸部を上方に変位させること
により、プラスチックボトル成形体の底部を上方若しく
は下方に２段階に延伸させることが出来る。プラスチッ
ク成形体は延伸される部分が延伸されない部分よりも延
伸方向への強度が向上するので、プラスチックボトルの
底部に上下方向に延伸された複数の縦壁部が形成される
ことにより、ボトルの底部の強度が従来よりも向上す
る。(Operation) According to the apparatus for manufacturing a plastic bottle according to the present invention, compressed air is injected into the parison in the closed mold from the air supply path to form a molded body of the plastic bottle in the cavity, and then the bottom portion is stretched. By displacing the part upward, the bottom of the molded plastic bottle can be extended upward or downward in two stages. Since the strength in the stretching direction of the stretched portion of the plastic molded body is higher than that of the unstretched portion, a plurality of vertical wall portions stretched in the vertical direction are formed at the bottom of the plastic bottle, and thus the bottom of the bottle is formed. Is more improved than before.
又、本発明のプラスチックボトルの製造方法によれ
ば、型締めした金型内のパリソンに空気供給路から圧縮
空気を注入してキャビティ内にプラスチックボトルの成
形体を形成した後、底部延伸部を上方に複数段階に変位
させると、プラスチックボトル成形体の底部が複数回延
伸されるので、プラスチックボトルの底部の強度が従来
よりも向上する。Further, according to the method for producing a plastic bottle of the present invention, after the compressed air is injected from the air supply path into the parison in the mold that has been clamped to form a molded body of the plastic bottle in the cavity, the bottom extending portion is formed. When the plastic bottle is displaced upward in a plurality of steps, the bottom of the plastic bottle molded body is stretched a plurality of times, so that the strength of the bottom of the plastic bottle is improved more than before.
（実施例） 以下、本発明にかかるプラスチックボトルの製造装置
及びその製造方法の実施例について説明する。なお、製
造方法は製造装置と共に説明する。(Example) Hereinafter, an example of an apparatus and a method for manufacturing a plastic bottle according to the present invention will be described. The manufacturing method will be described together with the manufacturing apparatus.
第１図乃至第４図は、本実施例にかかるブロー成形金
型の概略構成を示しており、１はブロー成形金型であ
る。このブロー成形金型１は、互いに接近、離反する一
対の分割金型1a,1bと、一対の分割金型1a,1bに嵌合され
る底部形成金型（底部延伸部）1cとによって構成されて
いる。一対の分割金型は押圧板2a,2bに取り付けられ、
押圧板2a,2bは図示しない平行ロッドによって押圧板2a,
2bの直交方向に往復動しうるようになっている。1 to 4 show a schematic configuration of a blow mold according to the present embodiment, and 1 is a blow mold. The blow molding die 1 includes a pair of split dies 1a and 1b approaching and separating from each other, and a bottom forming die (bottom extending portion) 1c fitted to the pair of split dies 1a and 1b. ing. The pair of split molds are attached to the pressing plates 2a, 2b,
The pressing plates 2a and 2b are formed by parallel rods (not shown).
It can reciprocate in the orthogonal direction of 2b.
一対の分割金型1a,1bの上方には、パリソン３を供給
する空気供給ヘッド（図示省略）が臨んでいる。一対の
分割金型1a,1bの上部には、空気供給ヘッドに装着され
たパリソン３の上部の周囲を挟持する挟持開口部4a,4b
が形成されている。分割金型1a,1bには、プラスチック
ボトルを形成するためのキャビティ形成用の凹部5a,5b
が形成されており、凹部5a,5bの下部には、底部形成金
型1cが嵌合される。An air supply head (not shown) for supplying the parison 3 faces above the pair of split molds 1a and 1b. In the upper part of the pair of split molds 1a, 1b, clamping openings 4a, 4b for clamping around the upper part of the parison 3 mounted on the air supply head.
Are formed. In the split molds 1a and 1b, recesses 5a and 5b for forming a cavity for forming a plastic bottle are provided.
Is formed, and a bottom forming die 1c is fitted to the lower part of the concave portions 5a and 5b.
底部形成金型1cは、キャビティ形成用凹部5a,5bの下
部に嵌合される嵌合部６と、嵌合部６内に嵌合される第
１延伸部７と、第１延伸部７内に嵌合される第２延伸部
８とを有しており、底部形成金型1cは図示しない支持装
置に支持されている。底部形成金型1cは、分割金型1a,1
bが型開きされたときの対向する空間に臨んでおり、分
割金型1a,1bの型締め時にキャビティ形成用の凹部5a,5b
の下部に嵌合される。嵌合部６の円形開口部6aは、プラ
スチックボトル成形体3aの底部3bの中央部をキャビティ
内部に押し出す第１延伸部７が摺動自在に保持されてい
る。第１延伸部７は支持装置の図示しない第１押圧ピン
によって上下方向に変位する。第２延伸部８は第１延伸
部７の円形開口部7aに摺動自在に保持され、支持装置の
図示しない第２押し出しピンによって上下方向に変位す
る。The bottom forming die 1c includes a fitting portion 6 fitted into the lower portion of the cavity forming recesses 5a, 5b, a first extension portion 7 fitted in the fitting portion 6, and a first extension portion 7 in the first extension portion 7. And a second extension portion 8 fitted to the bottom portion, and the bottom forming die 1c is supported by a support device (not shown). Bottom forming mold 1c is divided mold 1a, 1
b faces the opposing space when the mold is opened, and the concave parts 5a, 5b for forming the cavities when clamping the split molds 1a, 1b.
Is fitted to the lower part of The circular opening 6a of the fitting portion 6 slidably holds a first extending portion 7 that pushes the center of the bottom 3b of the plastic bottle molded body 3a into the cavity. The first extending portion 7 is vertically displaced by a first pressing pin (not shown) of the support device. The second extending portion 8 is slidably held by the circular opening 7a of the first extending portion 7, and is displaced in the vertical direction by a second push pin (not shown) of the support device.
このブロー成形金型は、袋状のパリソン３を装着した
空気供給ノズルを型開きした分割金型1a,1bの間に位置
させ（第１図参照）、分割金型1a,1bを型締めすると、
底部形成金型1cの嵌合部６が凹部5a,5bの下部に嵌合さ
れる（第２図参照）。このとき、第１延伸部７と第２延
伸部８は嵌合部６から上方には突出していない。空気供
給ノズルからパリソン３内に圧縮空気が供給され、パリ
ソン３が凹部5a,5b及び嵌合部６と、第１、第２延伸部
7,8との各上部6b,7b,8aに当接したら、プラスチックボ
トルの成形体3aの素体が形成される。このプラスチック
ボトル成形体3aが加熱状態にある時に、第１延伸部７と
第２延伸部８をキャビティ内部に進出させる。本実施例
では、まず第１延伸部７がプラスチックボトル成形体3a
の底部3bを押し出し、その底部3bの加熱状態のプラスチ
ックを延伸させる。次ぎに、第２延伸部８をキャビティ
内部に進出させてプラスチックボトル成形体3aの押し出
された部分の中央部を更に延ばす。これによって、プラ
スチックボトル成形体3aの底部3bに２つの縦壁部3c,3d
が形成され、プラスチックボトル成形体3aの底部3bが十
分に延伸される。プラスチックボトル成形体3aの底部3b
が２段階に延びることによって、プラスチックボトル成
形体3aの底部3bから非延伸部分が解消される。プラスチ
ックボトル成形体3aの底部3bを２段階に延伸させたら、
分割金型1a,1b及び底部形成金型1cを冷却する。プラス
チックボトル成形体3aがほぼ固まったら、分割金型1a,1
b及び底部形成金型1cを型開きし、プラスチックボトル
成形体3aを金型１から取り出す。In this blow molding die, when an air supply nozzle equipped with a bag-shaped parison 3 is positioned between the opened split dies 1a and 1b (see FIG. 1) and the split dies 1a and 1b are clamped. ,
The fitting part 6 of the bottom forming die 1c is fitted into the lower part of the recesses 5a and 5b (see FIG. 2). At this time, the first extending portion 7 and the second extending portion 8 do not protrude upward from the fitting portion 6. Compressed air is supplied into the parison 3 from the air supply nozzle, and the parison 3 is provided with the concave portions 5a and 5b and the fitting portion 6, and the first and second extending portions.
When the upper portions 6b, 7b, and 8a of the plastic bottles 7 and 8 come into contact with each other, the element body of the molded body 3a of the plastic bottle is formed. When the plastic bottle molded body 3a is in a heated state, the first extending portion 7 and the second extending portion 8 are advanced into the cavity. In the present embodiment, first, the first extending portion 7 is formed of the plastic bottle molded body 3a.
Is extruded, and the heated plastic of the bottom 3b is stretched. Next, the second extending portion 8 is advanced into the cavity to further extend the central portion of the extruded portion of the plastic bottle molded body 3a. Thereby, the two vertical wall portions 3c and 3d are provided on the bottom 3b of the plastic bottle molded body 3a.
Is formed, and the bottom 3b of the plastic bottle molded body 3a is sufficiently stretched. Bottom 3b of plastic bottle molded body 3a
Extend in two stages, the non-stretched portion from the bottom 3b of the plastic bottle molded body 3a is eliminated. After stretching the bottom 3b of the plastic bottle molded body 3a in two stages,
The split molds 1a and 1b and the bottom forming mold 1c are cooled. When the plastic bottle molded body 3a is almost solidified, the split molds 1a, 1
The mold b and the bottom mold 1c are opened, and the molded plastic bottle 3a is taken out of the mold 1.
第５図は、本発明の第２実施例の説明図である。この
第２実施例ではプラスチックボトル成形体3aの底部3bを
キャビティの内部に延伸させた後に、第２延伸部８をキ
ャビティから退避させることによって、プラスチックボ
トル成形体3aの押し出された部分の中央部3eを下方に延
伸させる。これによって、プラスチックボトル成形体3a
の底部3bに２つの縦壁部3c,3dが形成される。プラスチ
ックボトル成形体3aの底部3bが２段階に延びることによ
って、プラスチックボトル成形体3aの底部3bが充分に延
伸される。FIG. 5 is an explanatory diagram of a second embodiment of the present invention. In the second embodiment, after the bottom portion 3b of the plastic bottle molded body 3a is extended into the cavity, the second extended portion 8 is retracted from the cavity, so that the central part of the extruded portion of the plastic bottle molded body 3a is extended. 3e is stretched downward. Thereby, the plastic bottle molded body 3a
Two vertical wall portions 3c and 3d are formed on the bottom 3b. Since the bottom 3b of the plastic bottle molded body 3a extends in two stages, the bottom 3b of the plastic bottle molded body 3a is sufficiently stretched.
（発明の効果） 本発明のプラスチックボトルの製造装置及び製造方法
は、以上説明したように構成したので、プラスチックボ
トルの底部に複数の縦壁部が形成されるために、内容物
を充填したプラスチックボトルを落下させたときの耐久
性が向上するという非常に有益な効果を得ることができ
る。(Effect of the Invention) Since the manufacturing apparatus and the manufacturing method of the plastic bottle of the present invention are configured as described above, a plurality of vertical walls are formed at the bottom of the plastic bottle, so that the plastic filled with the contents is formed. A very beneficial effect of improving the durability when the bottle is dropped can be obtained.
第１図は、本発明の第１実施例にかかるプラスチックボ
トルの製造装置の概略構成図、 第２図は、第１実施例にかかる金型を型締めしてブロー
成形を行なった状態の説明図、 第３図は、第１実施例にかかる金型の第１、第２の延伸
部を同時に上方に変位させた状態の説明図、 第４図は、第１実施例にかかる金型の第２延伸部を上方
に変位させた状態の説明図、 第５図は、第２実施例にかかる金型の第２延伸部を下方
に変位させた状態の説明図である。 1a,1b……一対の分割金型 1c……底部形成金型 ３……パリソン 3a……プラスチックボトル成形体 3b……底部 3c,3d……縦壁部 5a,5b……凹部 ６……嵌合部 ７……第１延伸部 ８……第２延伸部FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing a plastic bottle according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating a state in which a mold according to the first embodiment is clamped to perform blow molding. FIG. 3, FIG. 3 is an explanatory view showing a state in which the first and second extending portions of the mold according to the first embodiment are simultaneously displaced upward, and FIG. 4 is a view of the mold according to the first embodiment. FIG. 5 is an explanatory view showing a state where the second extending portion is displaced upward, and FIG. 5 is an explanatory diagram showing a state where the second extending portion of the mold according to the second embodiment is displaced downward. 1a, 1b: a pair of split molds 1c: bottom mold 3: parison 3a: plastic bottle molded body 3b: bottom 3c, 3d: vertical wall 5a, 5b: recess 6: fitting Joint 7 First extension 8 Second extension
フロントページの続き (72)発明者 大西 秀之 東京都台東区台東１―５―１ 凸版印刷 株式会社内 (56)参考文献 特開 昭59−207218（ＪＰ，Ａ) 特開 昭50−85616（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 49/48 B29C 49/42 B29C 49/10Continuation of front page (72) Inventor Hideyuki Onishi 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (56) References JP-A-59-207218 (JP, A) JP-A-50-85616 (JP) , A) (58) Field surveyed (Int. Cl.6 , DB name) B29C 49/48 B29C 49/42 B29C 49/10
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|---|---|---|---|
| JP1214638AJP2780367B2 (en) | 1989-08-21 | 1989-08-21 | Apparatus and method for manufacturing plastic bottle |
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| EP2527126A3 (en)* | 2011-05-26 | 2014-04-02 | TI Automotive Technology Center GmbH | Receptacle with mount feature |
| US9289948B2 (en) | 2011-05-26 | 2016-03-22 | Ti Automotive Technology Center Gmbh | Receptacle with mount feature |
| Publication number | Publication date |
|---|---|
| JPH0376625A (en) | 1991-04-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |