【０００１】[0001]
【産業上の利用分野】本発明は、例えば炭酸含有飲料水
や清涼飲料水等を充填するのに好適な合成樹脂製壜用プ
リフォーム、それを用いた壜及び壜の製造方法に関する
ものであり、特に耐内圧に対して優れた作用を奏する合
成樹脂製壜用プリフォーム、それを用いた壜及び壜の製
造方法を提供するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bottle preform suitable for filling carbonated drinks, soft drinks, etc., a bottle and a bottle manufacturing method using the same. In particular, the present invention provides a synthetic resin bottle preform that exhibits an excellent effect on internal pressure resistance, a bottle using the same, and a method for manufacturing a bottle.
【０００２】[0002]
【従来の技術】従来、炭酸含有飲料水を充填する合成樹
脂製壜は図２に示すごとく、その胴部１は円管状と、肩
部２は球状に近くなっており、耐内圧に対して優れた形
状であるので胴部１かつ肩部２の肉厚の薄いものが使用
されている。2. Description of the Related Art Conventionally, as shown in FIG. 2, a synthetic resin bottle filled with carbonated drinking water has a body portion 1 having a circular tubular shape and a shoulder portion 2 having a substantially spherical shape. Since the shape is excellent, the body 1 and the shoulder 2 are thin.
【０００３】[0003]
【発明が解決しようとする課題】最近、該合成樹脂製壜
は図３に示すごとく、肩部３がなで肩である形状が顧客
より強く所望されている。しかしながら、なで肩を有す
る合成樹脂製壜に炭酸含有飲料水が充填されたときに肩
部３が内圧によって大きく変形し、顧客の所望する形状
が維持出来なくなり、入り味線低下も大きくなり、最終
購買者に容量不足が危ぶまれるといった問題がある。こ
の問題に対し、肩部３を厚肉にすることが考えられるが
通常の二軸延伸ブロー成形にて成形すると必要以上に厚
肉となり、その分胴部が薄肉となり、胴部の変形が大き
くなるといった欠点がある。本発明は、かかる欠点を解
決したものであり、肩部３の厚肉化をできるだけ抑制
し、内圧に対する形状維持を実現させたものである。Recently, as shown in FIG. 3, the synthetic resin bottle is strongly desired by the customer to have a shape in which the shoulder portion 3 is a rounded shoulder. However, when a synthetic resin bottle with shoulders is filled with carbonated drinking water, the shoulder portion 3 is greatly deformed by the internal pressure, the shape desired by the customer cannot be maintained, and the taste line is greatly reduced, making a final purchase. There is a problem that people are at risk of lack of capacity. For this problem, it is conceivable to make the shoulder portion 3 thicker, but if it is formed by ordinary biaxial stretch blow molding, it becomes thicker than necessary, and the body portion becomes thin accordingly, and the deformation of the body portion is large There is a drawback that The present invention solves the above-mentioned drawbacks, and suppresses the thickening of the shoulder portion 3 as much as possible and realizes the shape maintenance against the internal pressure.
【０００４】[0004]
【課題を解決するための手段】すなわち本発明の第１の
発明は、上端に開放口縁部を有し、下端に閉塞部を有す
る有底中空体からなる合成樹脂製壜用プリフォームであ
って、該合成樹脂製プリフォームが胴部と頸部の間に薄
肉肩部を有することを特徴とする合成樹脂製壜用プリフ
ォームであり、第２の発明は、前記合成樹脂製壜用プリ
フォームを二軸延伸ブロー成形することにより得られる
合成樹脂製壜であり、第３の発明は、前記合成樹脂製壜
用プリフォームを延伸に適する温度まで加熱し、金型内
にセットし、二軸延伸ブロー成形する方法において、該
合成樹脂製壜用プリフォームの胴部の温度が薄肉肩部の
温度より高くなるようにプリフォームを加熱し、二軸延
伸ブロー成形することを特徴とする合成樹脂製壜の製造
方法である。That is, the first aspect of the present invention is a synthetic resin bottle preform comprising a bottomed hollow body having an open edge at the upper end and a closed portion at the lower end. The synthetic resin preform has a thin shoulder between the body and the neck, and the second invention is the synthetic resin bottle preform. A third aspect of the present invention is a synthetic resin bottle obtained by biaxially stretch-blow molding a reform, wherein the synthetic resin bottle preform is heated to a temperature suitable for stretching, and is set in a mold. In the axial stretch blow molding method, the preform is heated so that the temperature of the body portion of the synthetic resin bottle preform becomes higher than the temperature of the thin shoulder portion, and biaxial stretch blow molding is performed. This is a method for manufacturing a resin bottle.
【０００５】以下、本発明を図面に基づいて具体的に説
明する。図１は本発明のプリフォーム４及びプリフォー
ム４を加熱する赤外線ヒーター１３を示す図である。図
１に示されるとおり、該プリフォーム４は、上端から開
放口縁部６、キャップ螺合用ねじ５、ネックサポートリ
ング１４、薄肉肩部８、胴部９及び閉塞部１０（丸底
部）の順に構成される。該プリフォーム４をマンドレル
１２にはめ込み、倒立させたまま回転し、該プリフォー
ム４の胴部９の外側を赤外線ヒータ１３により加熱す
る。該胴部９が延伸適温に加熱されたとき、該プリフォ
ーム４はブロー成形金型にセットされ二軸延伸ブロー成
形される。該プリフォームを加熱したとき、該赤外線ヒ
ータ１３によって加熱されていない薄肉肩部８は、プリ
フォーム胴部９からの熱伝達により加熱されるが、胴部
温度よりもやや低めの温度となる。このためブロー成形
工程で延伸されることが少なく、その薄肉肩部の厚み保
持率は、３０〜９５％の範囲となる。合成樹脂製壜用プ
リフォームの胴部の温度は薄肉肩部の温度より少なくと
も１０℃以上、好ましくは１５℃以上高く保持され、ブ
ロー成形金型にセットされ二軸延伸ブロー成形される。
本発明のプリフォームの薄肉肩部８とは、ネックサポー
トリング下部１５の外径値に対する薄肉肩部８の最低外
径値の比率が１００％以下、好ましくは２５〜９５％で
あるものを言う。尚、開放口縁部６、キャップ螺合用ね
じ５及びネックサポートリング１４からなる部分を総称
して頸部という。The present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a preform 4 and an infrared heater 13 for heating the preform 4 of the present invention. As shown in FIG. 1, the preform 4 has an opening mouth edge portion 6, a cap screwing screw 5, a neck support ring 14, a thin shoulder portion 8, a body portion 9 and a closing portion 10 (round bottom portion) in this order from the upper end. Composed. The preform 4 is fitted into the mandrel 12, rotated while being inverted, and the outside of the body portion 9 of the preform 4 is heated by the infrared heater 13. When the body 9 is heated to a temperature suitable for stretching, the preform 4 is set in a blow molding die and biaxially stretch blow molded. When the preform is heated, the thin shoulder portion 8 which is not heated by the infrared heater 13 is heated by heat transfer from the preform body portion 9, but has a temperature slightly lower than the body portion temperature. Therefore, it is rarely stretched in the blow molding process, and the thickness retention rate of the thin shoulder portion is in the range of 30 to 95%. The temperature of the body of the synthetic resin bottle preform is kept at least 10 ° C. or higher, preferably 15 ° C. or higher than the temperature of the thin shoulder, set in a blow mold and biaxially stretch blow molded.
The thin shoulder portion 8 of the preform of the present invention means that the ratio of the minimum outer diameter value of the thin shoulder portion 8 to the outer diameter value of the neck support ring lower portion 15 is 100% or less, preferably 25 to 95%. . The portion including the opening edge portion 6, the cap screwing screw 5, and the neck support ring 14 is generically called a neck portion.
【０００６】本発明のプリフォーム製造のために用いら
れる樹脂としては、飽和ポリエステル樹脂及びその共重
合体がある。Resins used for producing the preform of the present invention include saturated polyester resins and copolymers thereof.
【０００７】本発明の該プリフォーム４の該薄肉肩部８
の長さ及び厚みは該合成樹脂製壜の形状に応じて設計さ
れる。薄肉肩部８の長さは、一般的に１０ｍｍ以上であ
り、厚みは、通常、一定であるものが用いられるが、必
要に応じて傾斜状に厚みの変化するものも用いることが
できる。また該赤外線ヒータ１３の位置は該薄肉肩部８
と該胴部９の境界よりも該胴部９側にあることが望まし
い。The thin shoulder 8 of the preform 4 of the present invention.
The length and thickness are designed according to the shape of the synthetic resin bottle. The thickness of the thin shoulder portion 8 is generally 10 mm or more, and the thickness is usually constant, but a thickness that changes in an inclined manner can be used if necessary. Further, the position of the infrared heater 13 is set to the thin shoulder portion 8
It is desirable to be on the body 9 side with respect to the boundary between the body 9 and the body 9.
【０００８】本発明のプリフォームは、通常の射出成形
法にて容易に得られるものである。The preform of the present invention can be easily obtained by a usual injection molding method.
【０００９】本発明の合成樹脂製壜に炭酸含有飲料水が
充填されたときに、合成樹脂製壜の入り実線高さが低い
ことが好ましく、この値が低いことは、内圧による変形
が小さく、壜の初期形状が維持できていることになる。When the synthetic resin bottle of the present invention is filled with carbonated drinking water, the height of the solid line of the synthetic resin bottle is preferably low, and the lower value means less deformation due to internal pressure. This means that the initial shape of the bottle has been maintained.
【００１０】[0010]
【実施例】以下、実施例により本発明を詳細に説明す
る。The present invention will be described in detail below with reference to examples.
【００１１】実施例１ クルップコーポプラスト社（ドイツ国）の二軸延伸ブロ
ー成形機（型式ＬＢ−０１）を使用し、ポリエチレンテ
レフタレート（固有粘度０．８４、日本ユニペット社
製、商品名ＲＴ５５３Ｃ）を用い、これを射出成形し、
図１の形状のプリフォーム（プリフォームの全長１５０
ｍｍ、重量５５ｇ、薄肉肩部の長さ５０ｍｍ、厚み１．
５ｍｍ）を得た。このプリフォームの胴部を１０５℃、
薄肉肩部を８５℃となるよう加熱し、次に、金型内にセ
ットし、そのプリフォームの内部に圧縮空気を吹き込む
と同時にエアーシリンダーでプリフォーム内側底部を押
して、二軸延伸ブロー成形し、図３の合成樹脂製壜（全
長３０５ｍｍ、胴径９８ｍｍ、内容量１５００ｍｌ）を
得た。また該合成樹脂壜に４．０ヴォリームの炭酸水を
充填し、３８℃のオーブンに保管し、入り味線高さを１
日毎に７日まで測定した。試験結果を図５及び図６に示
す。図５に示すとおり、比較例１に比べ、壜肩部の肉厚
が小さく、壜胴部の肉厚が大きかった。又、図６に示す
とおり、入り味線高さは、低く良好であった。Example 1 Polyethylene terephthalate (Intrinsic viscosity 0.84, trade name RT553C manufactured by Nippon Unipet Co., Ltd.) was used by using a biaxial stretch blow molding machine (Model LB-01) manufactured by Krupp Corpoplast (Germany). Using injection molding,
Preform with the shape shown in Fig. 1 (total length of preform 150
mm, weight 55 g, thin shoulder length 50 mm, thickness 1.
5 mm) was obtained. The body of this preform is 105 ℃,
The thin shoulder is heated to 85 ° C, then set in a mold, and compressed air is blown into the preform, and at the same time the inner bottom of the preform is pushed by an air cylinder to perform biaxial stretch blow molding. The synthetic resin bottle of FIG. 3 (total length 305 mm, barrel diameter 98 mm, internal volume 1500 ml) was obtained. The synthetic resin bottle was filled with 4.0 volume of carbonated water and stored in an oven at 38 ° C.
Each day was measured up to 7 days. The test results are shown in FIGS. As shown in FIG. 5, the wall thickness of the bottle shoulder portion was smaller and the wall thickness of the bottle body portion was larger than in Comparative Example 1. Further, as shown in FIG. 6, the height of the flavoring line was low and good.
【００１２】比較例１ 実施例１において、薄肉肩部を設置していない図４に示
すプリフォーム（全長１３０ｍｍ）を用い、これを二軸
延伸ブロー成形し合成樹脂製壜を得た以外は同様に行っ
た。試験結果を図５及び図６に示す。入り味線高さが高
かった。尚、測定方法は以下の通り行った。 １）肉厚分布 合成樹脂製壜の開放口縁部の先端から２５〜２５５ｍｍ
までの１０ｍｍ間隔をマイクロメータで測定した。 ２）入り味線高さ 合成樹脂製壜の開放口縁部の先端から、内容物の液面ま
での高さを測定した。Comparative Example 1 The same as Example 1 except that the preform (total length 130 mm) shown in FIG. 4 having no thin shoulder portion was used, and this was biaxially stretch blow-molded to obtain a synthetic resin bottle. Went to. The test results are shown in FIGS. The taste line height was high. The measuring method was as follows. 1) Thickness distribution 25 to 255 mm from the tip of the open mouth edge of the synthetic resin bottle
Up to 10 mm intervals were measured with a micrometer. 2) Height of taste line The height from the tip of the open mouth edge of the synthetic resin bottle to the liquid level of the content was measured.
【００１３】[0013]
【発明の効果】以上の発明から明らかなように、本発明
の薄肉肩部を設けたプリフォームを用いること、及び、
胴部の温度が薄肉肩部の温度より高くなるように加熱
し、二軸延伸ブロー成形することで合成樹脂製壜の胴部
を薄肉にすることなく肩部を必要最小限に肉厚化し、内
圧に対する強度を向上させた合成樹脂製壜及びその製造
方法を得る。As is clear from the above invention, the use of the preform provided with the thin shoulder portion of the present invention, and
The temperature of the body is heated to a temperature higher than the temperature of the thin shoulder, and by biaxial stretch blow molding, the shoulder of the synthetic resin bottle is made thin to the minimum necessary without thinning the body, To obtain a synthetic resin bottle having improved strength against internal pressure and a method for producing the same.
【図１】本発明のプリフォーム及び赤外線ヒータの断面
図である。FIG. 1 is a cross-sectional view of a preform and an infrared heater according to the present invention.
【図２】従来の合成樹脂製壜の正面図である。FIG. 2 is a front view of a conventional synthetic resin bottle.
【図３】本発明（実施例１）の合成樹脂製壜の正面図で
ある。FIG. 3 is a front view of a synthetic resin bottle according to the present invention (Example 1).
【図４】比較例１のプリフォームの断面図である。FIG. 4 is a cross-sectional view of a preform of Comparative Example 1.
【図５】本発明の実施例１及び比較例１の結果である。FIG. 5 shows the results of Example 1 and Comparative Example 1 of the present invention.
【図６】本発明の実施例１及び比較例１の結果である。FIG. 6 shows the results of Example 1 and Comparative Example 1 of the present invention.
１ 壜胴部 ２ 壜肩部 ３ なで肩の壜肩部 ４ プリフォーム ５ キャップ螺合用ねじ ６ 開放口縁部 ７ 頚部 ８ 薄肉肩部 ９ 胴部 １０ 閉塞部 １２ マンドレル １３ 赤外線ヒータ １４ ネックサポートリング １５ ネックサポートリング下部 1 Bottle Body 2 Bottle Shoulder 3 Nades Shoulder Bottle Shoulder 4 Preform 5 Cap Screw Screw 6 Open Mouth Edge 7 Neck 8 Thin Wall Shoulder 9 Body 10 Closure 12 Mandrel 13 Infrared Heater 14 Neck Support Ring 15 Neck Support ring bottom
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31167493AJPH07164436A (en) | 1993-12-13 | 1993-12-13 | Synthetic resin bottle and production thereof |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31167493AJPH07164436A (en) | 1993-12-13 | 1993-12-13 | Synthetic resin bottle and production thereof |
| Publication Number | Publication Date |
|---|---|
| JPH07164436Atrue JPH07164436A (en) | 1995-06-27 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31167493APendingJPH07164436A (en) | 1993-12-13 | 1993-12-13 | Synthetic resin bottle and production thereof |
| Country | Link |
|---|---|
| JP (1) | JPH07164436A (en) |
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|---|---|---|---|---|
| JP2004066624A (en)* | 2002-08-06 | 2004-03-04 | Toyo Seikan Kaisha Ltd | Method for stretching/blow-molding plastic bottle |
| WO2012065162A1 (en)* | 2010-11-12 | 2012-05-18 | Jay Clarke Hanan | Preform extended finish for processing light weight bottles |
| US10118724B2 (en) | 2010-11-12 | 2018-11-06 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US10150585B2 (en) | 2011-12-05 | 2018-12-11 | Niagara Bottling, Llc | Plastic container with varying depth ribs |
| US10647465B2 (en) | 2010-11-12 | 2020-05-12 | Niagara Bottling, Llc | Perform extended finish for processing light weight ecologically beneficial bottles |
| US10829260B2 (en) | 2010-11-12 | 2020-11-10 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US11220368B2 (en) | 2012-12-27 | 2022-01-11 | Niagara Bottling, Llc | Swirl bell bottle with wavy ribs |
| US11597556B2 (en) | 2018-07-30 | 2023-03-07 | Niagara Bottling, Llc | Container preform with tamper evidence finish portion |
| US11597558B2 (en) | 2012-12-27 | 2023-03-07 | Niagara Bottling, Llc | Plastic container with strapped base |
| US11987416B2 (en) | 2012-02-20 | 2024-05-21 | Niagara Bottling, Llc | Plastic container |
| US12139295B2 (en) | 2021-03-12 | 2024-11-12 | Niagara Bottling, Llc | Container preform |
| US12246885B2 (en) | 2018-07-30 | 2025-03-11 | Niagara Bottling, Llc | Container preform with threaded tamper evidence finish |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004066624A (en)* | 2002-08-06 | 2004-03-04 | Toyo Seikan Kaisha Ltd | Method for stretching/blow-molding plastic bottle |
| US11142364B2 (en) | 2010-11-12 | 2021-10-12 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US11827410B2 (en) | 2010-11-12 | 2023-11-28 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US10118724B2 (en) | 2010-11-12 | 2018-11-06 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| WO2012065162A1 (en)* | 2010-11-12 | 2012-05-18 | Jay Clarke Hanan | Preform extended finish for processing light weight bottles |
| EP3492232A1 (en)* | 2010-11-12 | 2019-06-05 | Niagara Bottling, LLC | Preform extended finish for processing light weight bottles |
| US10329043B2 (en) | 2010-11-12 | 2019-06-25 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US10647465B2 (en) | 2010-11-12 | 2020-05-12 | Niagara Bottling, Llc | Perform extended finish for processing light weight ecologically beneficial bottles |
| US10829260B2 (en) | 2010-11-12 | 2020-11-10 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US8956707B2 (en) | 2010-11-12 | 2015-02-17 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US12246877B2 (en) | 2010-11-12 | 2025-03-11 | Niagara Bottling, Llc | Preform extended finish for processing light weight ecologically beneficial bottles |
| US10150585B2 (en) | 2011-12-05 | 2018-12-11 | Niagara Bottling, Llc | Plastic container with varying depth ribs |
| US10981690B2 (en) | 2011-12-05 | 2021-04-20 | Niagara Bottling, Llc | Plastic container with varying depth ribs |
| US11987416B2 (en) | 2012-02-20 | 2024-05-21 | Niagara Bottling, Llc | Plastic container |
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| US11220368B2 (en) | 2012-12-27 | 2022-01-11 | Niagara Bottling, Llc | Swirl bell bottle with wavy ribs |
| US11597556B2 (en) | 2018-07-30 | 2023-03-07 | Niagara Bottling, Llc | Container preform with tamper evidence finish portion |
| US12234052B2 (en) | 2018-07-30 | 2025-02-25 | Niagara Bottling, Llc | Container preform with tamper evidence finish portion |
| US12246885B2 (en) | 2018-07-30 | 2025-03-11 | Niagara Bottling, Llc | Container preform with threaded tamper evidence finish |
| US12139295B2 (en) | 2021-03-12 | 2024-11-12 | Niagara Bottling, Llc | Container preform |
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