JP4791163B2 - Heat-resistant container and heat-resistant container with contents - Google Patents

Heat-resistant container and heat-resistant container with contents Download PDF

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JP4791163B2
JP4791163B2 JP2005349135A JP2005349135A JP4791163B2 JP 4791163 B2 JP4791163 B2 JP 4791163B2 JP 2005349135 A JP2005349135 A JP 2005349135A JP 2005349135 A JP2005349135 A JP 2005349135A JP 4791163 B2 JP4791163 B2 JP 4791163B2
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resistant container
recess
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JP2007153366A (en
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大一 青木
要一 土屋
清典 島田
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Nissei ASB Machine Co Ltd
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Description

本発明は、耐熱容器及び内容物入りの耐熱容器に関する。 The present invention relates to a heat-resistant container of the heat-resistant container and contents Monoiri.

従来、二軸延伸ブロー成形されたポリエチレンテレフタレート製の容器、いわゆるＰＥＴボトルは、透明性が高く、丈夫であることなどから、多彩な内容物を充填する容器として採用されている。このようなＰＥＴボトルの内、特に１．５Ｌ以上の内容量をもつ中型・大型容器においては、その取り扱いを容易にするために、容器の胴部に把手を配置することが求められていた。しかしながら、このような把手付きの容器は、リサイクル性を向上させるため、容器の一部に把持部を一体形成することが提案されていた（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, a biaxially stretched blow molded polyethylene terephthalate container, so-called PET bottle, has been adopted as a container for filling various contents because of its high transparency and durability. Among such PET bottles, particularly in the case of medium-sized and large-sized containers having an internal volume of 1.5 L or more, it has been required to arrange a handle on the body of the container in order to facilitate handling. However, in order to improve the recyclability of such a container with a handle, it has been proposed to integrally form a grip portion on a part of the container (see, for example, Patent Document 1).

また、ＰＥＴボトルは、加熱殺菌された果汁飲料などの高温内容物を充填するため、耐熱性の向上が提案されていた（例えば、特許文献２参照）。しかしながら、このような耐熱性を有するＰＥＴボトルは、容器の胴部に大きな減圧吸収パネルが配置されているため、胴部に把持部を形成させることができなかった。したがって、これまで、良好な把持性と高い耐熱性とを兼ね備えたポリエチレンテレフタレート製の耐熱容器は、提案されていない。
特開平８−３２３８４５号公報 特開平１０−２８６８７４号公報 Moreover, since PET bottles are filled with high-temperature contents such as heat-sterilized fruit juice beverages, improvement in heat resistance has been proposed (for example, see Patent Document 2). However, such a heat-resistant PET bottle has a large vacuum absorption panel disposed on the body of the container, and thus a grip portion cannot be formed on the body. Therefore, until now, no heat-resistant container made of polyethylene terephthalate having both good gripping property and high heat resistance has been proposed.
JP-A-8-323845 Japanese Patent Laid-Open No. 10-286874

本発明の目的は、容器の把持性を向上させた、耐熱容器及び内容物入りの耐熱容器を提供することにある。 An object of the present invention is to provide a heat-resistant container and a heat-resistant container containing the contents, in which the gripping property of the container is improved.

本発明にかかる耐熱容器は、合成樹脂製の容器の胴部に、容器内側に陥没して形成された対向する第１の凹部及び第２の凹部と、該第１の凹部と第２の凹部との間を連結する把持部と、を有する合成樹脂製の耐熱容器であって、
前記第１の凹部及び前記第２の凹部は、
容器内側へ向かって傾斜して形成された環状の側壁部と、
前記側壁部の容器内側の端部に形成された底部と、
を有し、
前記容器に充填された高温内容物が冷却されて前記容器の内部が減圧された際に、前記第１の凹部の底部の容器内側面は、前記第２の凹部の底部の容器内側面に接触することを特徴とする。 The heat-resistant container according to the present invention includes a first concave portion and a second concave portion which are formed in a body portion of a synthetic resin container so as to be depressed inside the container, and the first concave portion and the second concave portion. A heat-resistant container made of synthetic resin having a gripping part connecting between
The first recess and the second recess are
An annular side wall formed to be inclined toward the inside of the container;
A bottom formed at an end of the side wall inside the container;
Have
When the high-temperature content filled in the container is cooled and the inside of the container is depressurized, the inner surface of the container at the bottom of the first recess contacts the inner surface of the container at the bottom of the second recess. It is characterized by doing.

本発明の一態様によれば、容器に充填された高温内容物が冷却されることで発生する容器内部の減圧を、２つの凹部の容器内側への変形によって吸収することができる。したがって、容器の他の部分の好ましくない変形を防止し、容器を把持するためにもともと容器内側に陥没して設けられた凹部が変形することで容器全体の外観を損うことが無い。   According to one aspect of the present invention, the reduced pressure inside the container that is generated by cooling the high-temperature content filled in the container can be absorbed by the deformation of the two concave portions toward the inside of the container. Therefore, undesired deformation of the other part of the container is prevented, and the concave part provided by being depressed inside the container is deformed so as not to damage the appearance of the entire container.

本発明にかかる内容物入りの耐熱容器は、本発明にかかる耐熱容器に内容物が充填され、前記第１の凹部の底部の容器内側面と、前記第２の凹部の底部の容器内側面とが接触していることを特徴とする。   In the heat-resistant container containing the contents according to the present invention, the heat-resistant container according to the present invention is filled with the contents, and the inner surface of the container at the bottom of the first recess and the inner surface of the container at the bottom of the second recess are It is characterized by being in contact.

本発明の一態様によれば、２つの凹部の底部の容器内側面同士が接触するため、消費者が容器を把持した際に凹部の変形がなく、しっかりと安定した把持感を得ることができる。   According to one aspect of the present invention, since the container inner side surfaces of the bottoms of the two recesses are in contact with each other, there is no deformation of the recess when the consumer grips the container, and a firm and stable grip feeling can be obtained. .

本発明にかかる耐熱容器の製造方法は、合成樹脂製の容器の胴部に、該胴部の容器内側に陥没して形成された対向する第１の凹部及び第２の凹部と、該第１の凹部と第２の凹部との間を連結する把持部と、を有する耐熱容器の製造方法であって、
プリフォームを該耐熱容器よりも大きな１次ブロー成形品にブロー成形する１次ブロー成形工程と、
前記１次ブロー成形品を熱処理して収縮させる熱処理工程と、
収縮した１次ブロー成形品を最終ブロー型内で再度ブロー成形する最終ブロー成形工程と、
を有し、
前記最終ブロー成形工程は、
前記最終ブロー型の型閉じ移動中に、前記収縮した１次ブロー成形品の胴部を前記最終ブロー型で押しながら変形させ、
変形した前記収縮した１次ブロー成形品の胴部を、ブロー成形中に、一対の押圧部材を互いに近接する方向に移動して前記第１の凹部と前記第２の凹部を成形することを特徴とする。 The method for producing a heat-resistant container according to the present invention includes a first concave portion and a second concave portion that are formed in a body portion of a synthetic resin container so as to be depressed inside the container of the body portion. A holding part that connects between the concave part and the second concave part, and a manufacturing method of a heat-resistant container,
A primary blow molding step of blow molding a preform into a primary blow molded product larger than the heat-resistant container;
A heat treatment step in which the primary blow-molded product is heat-treated and contracted;
A final blow molding step of blow molding the shrunk primary blow molded product again in the final blow mold;
Have
The final blow molding process includes
During the mold closing movement of the final blow mold, the body portion of the contracted primary blow molded product is deformed while being pushed by the final blow mold,
The first concave portion and the second concave portion are formed by moving the pair of pressing members in a direction approaching each other during the blow molding of the deformed primary blow molded article body. And

本発明の一態様によれば、熱処理工程で１次ブロー成形品を収縮させることで容器の応力ひずみを減少させた耐熱容器を成形することができると共に、収縮した１次ブロー成形品は、熱処理工程で与えられた熱量を有しているため、比較的深い凹部を容易に成形することができる。また、２つの凹部が形成される１次ブロー成形品の胴部は、最終容器の胴部の外径よりも大きく形成された後、最終ブロー型で押しながら変形させるため、十分に薄肉化されている。したがって、最終容器の胴部に比較的深い凹部を形成しても、凹部の周囲の容器壁部の肉厚が極端に薄くなることを防止できる。   According to one aspect of the present invention, a heat-resistant container in which the stress strain of the container is reduced can be formed by shrinking the primary blow-molded product in the heat treatment step. Since it has the amount of heat given in the process, a relatively deep recess can be easily formed. Also, the body of the primary blow-molded product in which the two recesses are formed is sufficiently thinned to be deformed while being pushed by the final blow mold after being formed larger than the outer diameter of the body of the final container. ing. Therefore, even if a relatively deep recess is formed in the body of the final container, it is possible to prevent the wall thickness of the container wall around the recess from becoming extremely thin.

以下、本発明の実施の形態について図面を参照しながら詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の一実施の形態にかかる耐熱容器を示す右側面図である。図２は、本発明の一実施の形態にかかる耐熱容器を示す平面図である。図３は、本発明の一実施の形態にかかる耐熱容器を示す正面図である。図４は、本発明の一実施の形態にかかる耐熱容器を示す背面図である。図５は、本発明の一実施の形態にかかる耐熱容器を示す概略横断面図（図１のＡ−Ａ’断面図）である。図６は、本発明の一実施の形態にかかるプリフォーム、１次ブロー成形品、中間容器及び耐熱容器の胴部外形を比較する概略横断面図である。図７〜図９は、本発明の一実施の形態にかかる耐熱容器の成形工程を説明する図である。   FIG. 1 is a right side view showing a heat-resistant container according to an embodiment of the present invention. FIG. 2 is a plan view showing a heat-resistant container according to one embodiment of the present invention. FIG. 3 is a front view showing a heat-resistant container according to one embodiment of the present invention. FIG. 4 is a rear view showing the heat-resistant container according to the embodiment of the present invention. FIG. 5 is a schematic cross-sectional view (A-A ′ cross-sectional view of FIG. 1) showing a heat-resistant container according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view comparing the outer shapes of the preforms of the preform, the primary blow-molded product, the intermediate container, and the heat-resistant container according to the embodiment of the present invention. 7-9 is a figure explaining the formation process of the heat-resistant container concerning one embodiment of this invention.

（耐熱容器）
まず、本発明の一実施の形態にかかる耐熱容器について説明する。 (Heat resistant container)
First, a heat-resistant container according to an embodiment of the present invention will be described.

図１〜図５に示すように、本発明の一実施の形態にかかる耐熱容器１０は、二軸延伸ブロー成形された合成樹脂、例えばポリエチレンテレフタレート製であって、開口しキャップを受け入れるためのネック部１２と、薄肉筒状の胴部１８と、該ネック部１２と該胴部１８とを拡径して接続する肩部１６と、自立可能な底部１４と、底部１４と胴部１８とを拡径して接続するヒール部２０と、を有する。   As shown in FIGS. 1 to 5, a heat-resistant container 10 according to an embodiment of the present invention is made of a biaxially stretched blow molded synthetic resin, such as polyethylene terephthalate, and has a neck for opening and receiving a cap. A portion 12, a thin cylindrical body 18, a shoulder 16 that expands and connects the neck 12 and the body 18, a self-supporting bottom 14, and a bottom 14 and a body 18. And a heel portion 20 that is expanded and connected.

胴部１８の外形は、図２及び図５に示すように、長辺側に容器側壁２２ａ，２２ｂと、短辺側にラベル部２４及び把持部２６とを有する略長方形である。胴部１８には、容器側壁２２ａ，２２ｂに連続し、かつ、耐熱容器１０の内側に陥没して形成された対向する第１の凹部２８ａ及び第２の凹部２８ｂと、該第１の凹部２８ａと第２の凹部２８ｂとの間を連結する把持部２６と、を有する。凹部２８ａ、２８ｂとほぼ同じ高さの位置に形成されたラベル部２４と把持部２６は、短辺側から長辺側へと連続する複数の横溝２４２、２６２が形成され、耐熱容器１０の減圧によってほとんど変形しない。また、凹部２８ａ、２８ｂの下方であって、ヒール部２０の上方の胴部１８には、ぐるりと全周に渡って連続する横溝２２２が２本形成されている。   As shown in FIGS. 2 and 5, the outer shape of the body portion 18 is a substantially rectangular shape having container side walls 22 a and 22 b on the long side and a label portion 24 and a grip portion 26 on the short side. The body portion 18 includes a first concave portion 28a and a second concave portion 28b that are continuous with the container side walls 22a and 22b and are formed to be recessed inside the heat-resistant container 10, and the first concave portion 28a. And the second recessed portion 28b. The label portion 24 and the grip portion 26 formed at substantially the same height as the recesses 28a and 28b are formed with a plurality of lateral grooves 242 and 262 continuous from the short side to the long side, Hardly deforms. Also, two lateral grooves 222 that are continuous over the entire circumference are formed in the body portion 18 below the recesses 28a and 28b and above the heel portion 20.

ラベル部２４は、図５に示すように、耐熱容器１０の正面にある短辺側から長辺側へと屈曲して連続した略Ｃ字状の横断面を有し、容器側壁２２ａ，２２ｂより容器内側へ１段窪んで形成され、商品名などを表示するラベルが貼り付けられる。短辺側から長辺側へ延びるラベル部２４と、第１の凹部２８ａ及び第２の凹部２８ｂとの間には、縦リブ２３ａ，２３ｂが形成されている。   As shown in FIG. 5, the label portion 24 has a substantially C-shaped cross section that is bent from the short side to the long side on the front of the heat-resistant container 10 and is continuous, and from the container side walls 22a and 22b. A label is formed to be recessed one step toward the inside of the container, and a label for displaying a product name or the like is attached. Vertical ribs 23a and 23b are formed between the label portion 24 extending from the short side to the long side and the first and second recesses 28a and 28b.

縦リブ２３ａ，２３ｂは、ラベル部２４と第１の凹部２８ａ及び第２の凹部２８ｂと略同じ高さに渡って形成されている。縦リブ２３ａ，２３ｂは、図１及び図５に示すように、その上下にある容器側壁２２ａ，２２ｂに接続し、かつ、容器側壁２２ａ，２２ｂの外形とほぼ同じ外形である。   The vertical ribs 23a and 23b are formed over substantially the same height as the label 24, the first recess 28a, and the second recess 28b. As shown in FIGS. 1 and 5, the vertical ribs 23 a and 23 b are connected to the container side walls 22 a and 22 b located above and below and have substantially the same outer shape as the container side walls 22 a and 22 b.

把持部２６は、耐熱容器１０の背面にある短辺側に形成され、肩部１６から胴部１８の下方に向けて第１の凹部２８ａ及び第２の凹部２８ｂとほぼ同じ高さに渡って形成されている。把持部２６は、胴部１８の短辺側において把持部２６の上下に形成された胴部１８の外径とほぼ同じ外径を有し、長辺側において容器側壁２２ａ，２２ｂよりも耐熱容器１０の内側に窪んで形成され、消費者が把持する際に握り易い形状を有する。また、把持部２６が胴部１８の短辺方向に細く形成されることで、第１の凹部２８ａと第２の凹部２８ｂをブロー成形した際に、把持部２６が極端に薄肉化することを防止し、かつ、賦形性を向上させることができる。   The grip portion 26 is formed on the short side on the back surface of the heat-resistant container 10 and extends from the shoulder portion 16 to the lower portion of the trunk portion 18 over almost the same height as the first recess 28a and the second recess 28b. Is formed. The gripping portion 26 has an outer diameter substantially the same as the outer diameter of the barrel portion 18 formed above and below the gripping portion 26 on the short side of the barrel portion 18, and is more heat resistant than the container side walls 22 a and 22 b on the long side. 10 is formed so as to be recessed inside, and has a shape that is easy to grip when a consumer grips. Further, since the gripping portion 26 is formed to be thin in the short side direction of the body portion 18, the gripping portion 26 is extremely thinned when the first recess 28 a and the second recess 28 b are blow-molded. It is possible to prevent and improve the formability.

第１の凹部２８ａと第２の凹部２８ｂは、高温内容物を充填した際に、いわゆる減圧吸収パネルとして機能する。第１の凹部２８ａと第２の凹部２８ｂは、容器側壁２２ａ，２２ｂから耐熱容器１０の内側へ向かって傾斜して形成された環状の第１の凹部の側壁部２８２ａ及び第２の凹部の側壁部２８２ｂと、該第１の凹部の側壁部２８２ａ及び該第２の凹部の側壁部２８２ｂの耐熱容器１０の内側の端部に形成された第１の凹部の底部２８０ａ及び第２の凹部の底部２８０ｂと、を有する。第１の凹部の底部２８０ａは、第２の凹部の底部２８０ｂと対向して形成され、耐熱容器１０に充填された高温内容物が冷却されて耐熱容器１０の内部が減圧された際に、第１の凹部の底部２８０ａの容器内側面２８４ａは、第２の凹部の底部２８０ｂの容器内側面２８４ｂに接触する。したがって、内容物が充填されていない状態において、第１の凹部の底部２８０ａの容器内側面２８４ａと、第２の凹部の底部２８０ｂの容器内側面２８４ｂとの隙間は、ごくわずかであり、例えば０．５ｍｍ〜２ｍｍに形成されている。容器内側面２８４ａと容器内側面２８４ｂとの隙間は、耐熱容器１０の内容量、高温内容物の充填量、高温内容物の温度などによって適宜設定される。   The first concave portion 28a and the second concave portion 28b function as a so-called reduced pressure absorption panel when filled with high temperature contents. The first concave portion 28a and the second concave portion 28b are formed by inclining from the container side walls 22a and 22b toward the inside of the heat-resistant container 10 and the side wall portion 282a of the annular first concave portion and the side wall of the second concave portion. Part 282b, first recess bottom 280a and second recess bottom formed at the inner end of heat-resistant container 10 of first recess sidewall 282a and second recess sidewall 282b 280b. The bottom portion 280a of the first recess is formed to face the bottom portion 280b of the second recess, and when the high-temperature contents filled in the heat-resistant container 10 are cooled and the inside of the heat-resistant container 10 is depressurized, The container inner side surface 284a of the bottom portion 280a of the first recess comes into contact with the container inner side surface 284b of the bottom portion 280b of the second recess. Therefore, in a state where the contents are not filled, the gap between the container inner side surface 284a of the bottom portion 280a of the first recess and the container inner side surface 284b of the bottom portion 280b of the second recess is very small, for example, 0 .5 mm to 2 mm. The gap between the container inner side surface 284a and the container inner side surface 284b is appropriately set depending on the inner volume of the heat-resistant container 10, the filling amount of the high temperature content, the temperature of the high temperature content, and the like.

図１〜図５に示す耐熱容器１０には、ネック部１２の中心を通って縦方向に延びる中心軸Ｏと、中心軸Ｏを通って胴部１８の長辺側の最大径となる長軸Ｌと、中心軸Ｏを通って長軸Ｌと直交する短軸Ｓと、を示す。短軸Ｓは、胴部１８の短辺側の最大径となる。第１の凹部の底部２８０ａ及び第２の凹部の底部２８０ｂにおける中心軸Ｏ側の端部は、胴部１８の長辺側の最大径の５０％以下の範囲にある。通常、このような把持用の凹部は、賦形性をよくするため、胴部の中心軸Ｏからなるべく遠ざけた位置に形成されるが、本発明の耐熱容器１０の成形方法においては、凹部の賦形性に優れるため、中心軸Ｏ付近に第１の凹部２８ａ及び第２の凹部２８ｂを配置して形成することができる。   The heat-resistant container 10 shown in FIGS. 1 to 5 includes a central axis O that extends in the vertical direction through the center of the neck portion 12 and a long axis that passes through the central axis O and has a maximum diameter on the long side of the body portion 18. L and a short axis S perpendicular to the long axis L through the central axis O are shown. The short axis S is the maximum diameter on the short side of the body 18. The ends on the central axis O side of the bottom portion 280a of the first recess and the bottom portion 280b of the second recess are in the range of 50% or less of the maximum diameter on the long side of the body portion 18. Usually, such a concave portion for gripping is formed at a position as far as possible from the central axis O of the trunk portion in order to improve shapeability. However, in the molding method of the heat-resistant container 10 of the present invention, Since it is excellent in formability, it can be formed by arranging the first recess 28a and the second recess 28b in the vicinity of the central axis O.

（内容物入りの耐熱容器）
次に、本発明の一実施の形態にかかる内容物入りの耐熱容器について説明する。 (Heat-resistant container with contents)
Next, a heat-resistant container containing contents according to an embodiment of the present invention will be described.

本発明の一実施の形態にかかる内容物入りの耐熱容器は、前記耐熱容器１０に内容物が充填されたもので、高温内容物が冷却され、耐熱容器１０の内部が減圧状態にある。したがって、横溝２２２、２４２、２６２で補強されていない第１の凹部２８ａ及び第２の凹部２８ｂがさらに耐熱容器１０の内方へ変形している。第１の凹部２８ａ及び第２の凹部２８ｂが内方へ変形することによって、第１の凹部の底部２８０ａの容器内側面２８４ａと、第２の凹部の底部２８０ｂの容器内側面２８４ｂと、が接触している。また、縦リブ２３ａ，２３ｂが形成されていることで、第１の凹部２８ａ及び第２の凹部２８ｂのみに変形を集中させ、胴部１８全体が楕円形に変形することを防止できる。   The heat-resistant container containing the contents according to one embodiment of the present invention is the one in which the heat-resistant container 10 is filled with the contents, the high-temperature contents are cooled, and the inside of the heat-resistant container 10 is in a reduced pressure state. Therefore, the first recess 28 a and the second recess 28 b that are not reinforced by the lateral grooves 222, 242, and 262 are further deformed inward of the heat-resistant container 10. When the first concave portion 28a and the second concave portion 28b are deformed inward, the container inner side surface 284a of the bottom portion 280a of the first concave portion and the container inner side surface 284b of the bottom portion 280b of the second concave portion are in contact with each other. is doing. Further, since the vertical ribs 23a and 23b are formed, it is possible to concentrate deformation only on the first concave portion 28a and the second concave portion 28b and prevent the entire body portion 18 from being deformed into an elliptical shape.

例えば、市場で消費者が内容物入りの耐熱容器を右手で把持する場合、第１の凹部２８ａには親指を入れ、第２の凹部２８ｂは他の４指を入れて、把持部２６を握るが、その際に、第１の凹部２８ａ及び第２の凹部２８ｂが耐熱容器１０の内方へ変形しないので、しっかりと安定した把持感を与えることができる。また、第１の凹部２８ａ及び第２の凹部２８ｂが深く形成されるため、消費者は比較的重い内容物入りの耐熱容器であっても確実に指を入れることができるので把持しやすい。   For example, when a consumer holds a heat-resistant container containing contents with the right hand in the market, the thumb is placed in the first recess 28a and the other four fingers are put in the second recess 28b to grip the grip 26. In this case, since the first concave portion 28a and the second concave portion 28b are not deformed inward of the heat-resistant container 10, a firm and stable grip feeling can be given. Further, since the first concave portion 28a and the second concave portion 28b are formed deeply, it is easy for a consumer to hold a finger even if it is a heat-resistant container containing a relatively heavy content.

（耐熱容器の成形方法）
本発明の一実施の形態にかかる耐熱容器１０の成形方法について、図６〜図９を用いて説明する。 (Method of forming heat-resistant container)
A method for forming the heat-resistant container 10 according to the embodiment of the present invention will be described with reference to FIGS.

本発明の一実施の形態にかかる耐熱容器１０の製造方法は、図６に示すように、プリフォーム４０を該耐熱容器１０よりも大きな１次ブロー成形品４２にブロー成形する１次ブロー成形工程と、１次ブロー成形品４２を熱処理して収縮させる熱処理工程と、収縮した１次ブロー成形品（以下、中間容器という）４４を最終ブロー型内で再度ブロー成形する最終ブロー成形工程と、を有する。   As shown in FIG. 6, the manufacturing method of the heat-resistant container 10 according to one embodiment of the present invention is a primary blow molding process in which the preform 40 is blow-molded into a primary blow-molded product 42 larger than the heat-resistant container 10. A heat treatment step for heat-treating and shrinking the primary blow-molded product 42; and a final blow-molding step for blow-molding the shrunken primary blow-molded product (hereinafter referred to as an intermediate container) 44 again in a final blow mold. Have.

（プリフォーム成形工程）
まず、例えばポリエチレンテレフタレート樹脂を射出成形してプリフォーム４０を得る。プリフォーム４０は、耐熱容器１０と同じ形状のネック部１２と、該ネック部１２に接続する円筒状の胴部と、該胴部を閉塞する底部と、を有する。図６に示されるプリフォーム４０は、プリフォーム４０の胴部の外形を示す。 (Preform molding process)
First, for example, a preform 40 is obtained by injection molding a polyethylene terephthalate resin. The preform 40 includes a neck portion 12 having the same shape as that of the heat-resistant container 10, a cylindrical body portion connected to the neck portion 12, and a bottom portion that closes the body portion. A preform 40 shown in FIG. 6 shows an outer shape of a body portion of the preform 40.

（１次ブロー成形工程）
次に、プリフォーム４０を図示せぬ赤外線ヒータなどの加熱装置によって延伸適温（例えば、１００〜１２０℃）に加熱した後、図示せぬ割型の１次ブロー型及び１次底型内に配置する。１次ブロー型は、最終成形品である耐熱容器１０よりも大きなキャビティを有している。１次ブロー型内に配置されたプリフォーム４０を、周知の方法例えば、図示せぬ延伸ロッドによりプリフォーム４０の縦軸方向に延伸し、高圧エアにより周方向にブローして、薄肉の１次ブロー成形品４２が二軸延伸ブロー成形される。１次ブロー成形品４２は、耐熱容器１０のネック部１２の中心軸Ｏを通る短軸Ｓ及び長軸Ｌよりも大きな直径の円筒状の胴部を有する。なお、図６に示される１次ブロー成形品４２は、１次ブロー成形品４２の胴部の外形を示す。１次ブロー成形品４２内の高圧エアを脱気すると共に、１次ブロー型を型開きして、１次ブロー成形品４２を取り出す。 (Primary blow molding process)
Next, the preform 40 is heated to an appropriate stretching temperature (for example, 100 to 120 ° C.) by a heating device such as an infrared heater (not shown), and then placed in a split primary blow mold and a primary bottom mold (not shown). To do. The primary blow mold has a larger cavity than the heat-resistant container 10 which is the final molded product. The preform 40 placed in the primary blow mold is stretched in the well-known method, for example, in the longitudinal direction of the preform 40 by a stretching rod (not shown), and blown in the circumferential direction by high-pressure air, so that the thin primary The blow molded product 42 is biaxially stretch blow molded. The primary blow-molded product 42 has a cylindrical body having a diameter larger than the short axis S and the long axis L passing through the central axis O of the neck portion 12 of the heat-resistant container 10. The primary blow molded product 42 shown in FIG. 6 shows the outer shape of the trunk portion of the primary blow molded product 42. The high-pressure air in the primary blow-molded product 42 is degassed and the primary blow mold is opened to take out the primary blow-molded product 42.

（熱処理工程）
次に、１次ブロー成形品４２を、１次ブロー型及び１次底型と同じキャビティ形状を有した熱処理型及び熱処理底型内に配置し、型締めする。１次ブロー成形品４２内に高圧エアを導入し、熱処理型のキャビティ面に１次ブロー成形品４２を確実に接触させる。このときの高圧エアは、１次ブロー成形品４２の熱収縮に抗して熱処理型に１次ブロー成形品４２を接触維持させる程度の圧力で有り、例えば０．５ＭＰａ〜２．５ＭＰａである。熱処理型は、１次ブロー成形品４２の結晶化が促進する温度（例えば、１５０〜２２０℃）に加熱されている。所定時間例えば、２〜１０秒程度熱処理をした後、１次ブロー成形品４２内の高圧エアを脱気すると共に、熱処理型を型開きすると、１次ブロー成形品４２は急激に収縮して中間容器４４になる。この収縮は、１次ブロー成形品４２の胴部に、二軸延伸ブロー成形された際に配向の不十分な箇所が歪部分として残っており、熱処理型から受けた熱によって歪部分が収縮変形するためである。そして、この収縮変形することによって、歪部分がなくなりもしくは減少するが、高度に配向された部分は維持されるものと推測される。また、１次ブロー成形品４２は、熱処理型による加熱によって結晶化が進行する。このため、収縮後の1次ブロー成形品４２、つまり中間容器４４及び耐熱容器１０の胴部の樹脂は、密度が高くなる。中間容器４４は、最終成形品である耐熱容器１０の少なくとも長軸Ｌよりも小さな外形を有する。中間容器４４の外形が長軸Ｌよりも大きいと、図７〜９に示す最終ブロー型５０ａ，５０ｂを型締めする際に中間容器４４を挟み込んでしまうためである。また、中間容器４４を、最終ブロー成形工程へ移動する途中で、中間容器４４の側方に配置した複数の赤外線ヒータによって加熱して、二次熱処理工程を実施してもよい。二次熱処理工程は、中間容器４４の結晶化を促進する程度の温度であって、中間容器４４がさらに収縮しない程度の温度に加熱することが好ましい。 (Heat treatment process)
Next, the primary blow-molded product 42 is placed in a heat treatment mold and a heat treatment bottom mold having the same cavity shape as the primary blow mold and the primary bottom mold, and clamped. High-pressure air is introduced into the primary blow-molded product 42 to ensure that the primary blow-molded product 42 is in contact with the cavity surface of the heat treatment mold. The high-pressure air at this time is a pressure at which the primary blow-molded product 42 is kept in contact with the heat treatment mold against thermal contraction of the primary blow-molded product 42, and is, for example, 0.5 MPa to 2.5 MPa. The heat treatment mold is heated to a temperature (for example, 150 to 220 ° C.) that promotes crystallization of the primary blow-molded product 42. After heat treatment for a predetermined time, for example, about 2 to 10 seconds, the high-pressure air in the primary blow-molded product 42 is degassed, and when the heat treatment mold is opened, the primary blow-molded product 42 contracts rapidly and becomes intermediate. A container 44 is formed. This shrinkage is caused by a portion of insufficient orientation remaining as a strained portion in the body portion of the primary blow-molded product 42 when biaxially stretched blow-molded, and the strained portion shrinks and deforms due to heat received from the heat treatment mold. It is to do. Then, by this shrinkage deformation, the strained portion disappears or decreases, but it is presumed that the highly oriented portion is maintained. The primary blow-molded product 42 is crystallized by heating with a heat treatment mold. For this reason, the primary blow-molded product 42 after shrinkage, that is, the resin in the body of the intermediate container 44 and the heat-resistant container 10 has a high density. The intermediate container 44 has an outer shape smaller than at least the long axis L of the heat-resistant container 10 that is the final molded product. This is because if the outer shape of the intermediate container 44 is larger than the major axis L, the intermediate container 44 is sandwiched when the final blow molds 50a and 50b shown in FIGS. In addition, the secondary heat treatment process may be performed by heating the intermediate container 44 with a plurality of infrared heaters arranged on the sides of the intermediate container 44 in the middle of moving to the final blow molding process. The secondary heat treatment step is preferably heated to a temperature that promotes crystallization of the intermediate container 44 and does not further shrink.

（最終ブロー成形工程）
最後に、図７〜図９に示すように、中間容器４４を最終ブロー型５０ａ，５０ｂ及び図示せぬ最終底型内に配置して、中間容器４４内に再度高圧エアを導入し、耐熱容器１０を得る。 (Final blow molding process)
Finally, as shown in FIGS. 7 to 9, the intermediate container 44 is disposed in the final blow molds 50 a and 50 b and the final bottom mold (not shown), high-pressure air is again introduced into the intermediate container 44, and the heat-resistant container Get 10.

図７に示すように、最終ブロー型５０ａ、５０ｂは、耐熱容器１０の長軸Ｌをパーティング面とした１対の割型であり、最終ブロー型５０ａは耐熱容器１０の右半分を形成するブローキャビティ５２ａを有し、最終ブロー型５０ｂは耐熱容器１０の左半分を形成するブローキャビティ５２ｂを有している。最終ブロー型５０ａ、５０ｂは、図示せぬ型締め駆動装置に取り付けられた型締板６０ａ，６０ｂに固定されている。型締板６０ａ，６０ｂには押圧装置５５ａ，５５ｂが設けられている。押圧装置５５ａ，５５ｂは、型締板６０ａ，６０ｂ内に配置されたシリンダ５６ａ，５６ｂと、シリンダ５６ａ，５６ｂ内を摺動して耐熱容器の短軸Ｓと並行に進退するピストン５８ａ，５８ｂと、ピストン５８ａ，５８ｂからブローキャビティ５２ａ，５２ｂに向かって延びるピストンロッド５９ａ，５９ｂと、ピストンロッド５９ａ，５９ｂの先端に固定された押圧部材５４ａ，５４ｂと、を有する。押圧部材５４ａ，５４ｂは、型開き状態において後退し、その先端は、ブローキャビティ５２ａ，５２ｂとほぼ同じ面であってほとんど突出せずに配置されている。   As shown in FIG. 7, the final blow molds 50 a and 50 b are a pair of split molds having the major axis L of the heat-resistant container 10 as a parting surface, and the final blow mold 50 a forms the right half of the heat-resistant container 10. The final blow mold 50 b has a blow cavity 52 b that forms the left half of the heat-resistant container 10. The final blow molds 50a and 50b are fixed to mold clamping plates 60a and 60b attached to a mold clamping drive device (not shown). The mold clamping plates 60a and 60b are provided with pressing devices 55a and 55b. The pressing devices 55a and 55b include cylinders 56a and 56b disposed in the mold clamping plates 60a and 60b, and pistons 58a and 58b that slide in the cylinders 56a and 56b and advance and retreat in parallel with the short axis S of the heat-resistant container. The piston rods 59a and 59b extend from the pistons 58a and 58b toward the blow cavities 52a and 52b, and the pressing members 54a and 54b are fixed to the ends of the piston rods 59a and 59b. The pressing members 54a and 54b are retracted in the mold open state, and their tips are arranged on the substantially same surface as the blow cavities 52a and 52b and hardly protrude.

図８に示すように、型締板６０ａ，６０ｂを移動させて、最終ブロー型５０ａ、５０ｂを型締めすると、その最終ブロー型５０ａ、５０ｂの型閉じ移動中に、収縮した１次ブロー成形品４２すなわち中間容器４４の胴部を最終ブロー型５０ａ、５０ｂで押しながら変形させる。このように最終ブロー型５０ａ、５０ｂで中間容器４４の胴部を変形させることで、中間容器４４は耐熱容器１０の長軸Ｌ方向に広がるように押しつぶされ、耐熱容器１０の形状に近づくことができる。したがって、従来のようにプリフォームから直接横断面長方形の胴部を有する容器をブロー成形した場合に比べて、耐熱容器１０の短辺、つまり耐熱容器１０のラベル部２４及び把持部２６の肉厚が厚くなり、肉厚分布が良好となる。   As shown in FIG. 8, when the mold clamping plates 60 a and 60 b are moved and the final blow molds 50 a and 50 b are clamped, the primary blow molded product contracted during the mold closing movement of the final blow molds 50 a and 50 b. 42, that is, the body portion of the intermediate container 44 is deformed while being pushed by the final blow molds 50a and 50b. In this way, by deforming the body portion of the intermediate container 44 with the final blow molds 50a and 50b, the intermediate container 44 is crushed so as to spread in the long axis L direction of the heat-resistant container 10, and approaches the shape of the heat-resistant container 10. it can. Therefore, compared to the case where a container having a rectangular body section having a rectangular cross section is blow-molded directly from a preform as in the prior art, the short sides of the heat-resistant container 10, that is, the thickness of the label portion 24 and the gripping portion 26 of the heat-resistant container 10. Becomes thicker and the thickness distribution becomes better.

さらに、図９に示すように、最終ブロー型５０ａ、５０ｂで押すことで変形した中間容器４４の胴部を、ブロー成形中に、一対の押圧部材５４ａ，５４ｂを互いに近接する方向に例えば２０ｍｍ程度移動して第１の凹部２８ａと第２の凹部２８ｂを成形する。より詳細には、最終ブロー型５０ａ、５０ｂ内の中間容器４４内に２次ブローエアよりも低圧の１次ブローエアを導入し、耐熱容器１０のおおよその形状に膨らませた状態で、ピストン５８ａ，５８ｂを駆動して、押圧部材５４ａ，５４ｂを互いに近接する方向に移動させる。押圧部材５４ａ，５４ｂが所定位置まで移動した後、高圧の２次ブローエアを導入して、耐熱容器１０を成形する。中間容器４４は熱処理工程及び二次熱処理工程において加熱されているので、従来のようにプリフォームから直接容器にブロー成形する場合に比べて、最終ブロー成形工程の成形が容易である。   Further, as shown in FIG. 9, the body portion of the intermediate container 44 deformed by being pushed by the final blow molds 50 a and 50 b is, for example, about 20 mm in a direction in which the pair of pressing members 54 a and 54 b are close to each other during blow molding. It moves and the 1st crevice 28a and the 2nd crevice 28b are fabricated. More specifically, the primary blow air having a pressure lower than that of the secondary blow air is introduced into the intermediate container 44 in the final blow molds 50a and 50b, and the pistons 58a and 58b are expanded in an approximate shape of the heat-resistant container 10. Driven to move the pressing members 54a and 54b in directions close to each other. After the pressing members 54a and 54b have moved to predetermined positions, high-pressure secondary blow air is introduced to mold the heat-resistant container 10. Since the intermediate container 44 is heated in the heat treatment step and the secondary heat treatment step, the final blow molding step can be easily formed as compared with the case where the preform is directly blow molded from the preform into the container.

こうして得られた本発明の一実施の形態にかかる耐熱容器１０は、従来の1回ブロー成形の耐熱容器に比べて１次ブロー成形品４２で大きく配向され、さらに熱処理工程によって結晶化が進行することによって耐熱性を大きく向上させることができる。なお、本発明は、前記実施の形態に限定されるものではなく、本発明の要旨の範囲内において種々の実施の形態に変更可能である。例えば、上記説明においては、１次ブロー型と熱処理型とを別々の金型を用いたが、１次ブロー型を内蔵ヒータによって加熱しておくことで、１次ブロー型で熱処理工程を行なってもよい。その場合、１次ブロー型とは別に設けられた熱処理型は必ずしも必要ではない。   The heat-resistant container 10 according to one embodiment of the present invention thus obtained is oriented more in the primary blow-molded product 42 than the conventional one-time blow-molded heat-resistant container, and further crystallization proceeds by a heat treatment process. Therefore, heat resistance can be greatly improved. In addition, this invention is not limited to the said embodiment, It can change into various embodiment within the range of the summary of this invention. For example, in the above description, separate molds are used for the primary blow mold and the heat treatment mold, but the primary blow mold is heated by the built-in heater to perform the heat treatment process using the primary blow mold. Also good. In that case, a heat treatment mold provided separately from the primary blow mold is not necessarily required.

図１は、本発明の一実施の形態にかかる耐熱容器を示す右側面図である。FIG. 1 is a right side view showing a heat-resistant container according to an embodiment of the present invention. 本発明の一実施の形態にかかる耐熱容器を示す平面図である。It is a top view which shows the heat-resistant container concerning one embodiment of this invention. 本発明の一実施の形態にかかる耐熱容器を示す正面図である。It is a front view which shows the heat-resistant container concerning one embodiment of this invention. 本発明の一実施の形態にかかる耐熱容器を示す背面図である。It is a rear view which shows the heat-resistant container concerning one embodiment of this invention. 本発明の一実施の形態にかかる耐熱容器を示す概略横断面図（図１のＡ−Ａ’線断面図）である。It is a schematic cross-sectional view (A-A 'line sectional view of FIG. 1) which shows the heat-resistant container concerning one embodiment of this invention. 本発明の一実施の形態にかかるプリフォーム、１次ブロー成形品、中間容器及び耐熱容器の胴部外形を比較する概略横断面図である。It is a schematic cross-sectional view which compares the trunk | drum external shape of the preform concerning one embodiment of this invention, a primary blow molded product, an intermediate | middle container, and a heat-resistant container. 本発明の一実施の形態にかかる耐熱容器の成形工程を説明する図である。It is a figure explaining the formation process of the heat-resistant container concerning one embodiment of the present invention. 本発明の一実施の形態にかかる耐熱容器の成形工程を説明する図である。It is a figure explaining the formation process of the heat-resistant container concerning one embodiment of the present invention. 本発明の一実施の形態にかかる耐熱容器の成形工程を説明する図である。It is a figure explaining the formation process of the heat-resistant container concerning one embodiment of the present invention.

符号の説明Explanation of symbols

１０ 耐熱容器
１２ ネック部
１４ 底部
１６ 肩部
１８ 胴部
２０ ヒール部
２２ａ，２２ｂ 容器側壁
２３ａ，２３ｂ 縦リブ
２４ ラベル部
２６ 把持部
２８ａ 第１の凹部
２８ｂ 第２の凹部
４０ プリフォーム
４２ １次ブロー成形品
４４ 中間容器
５０ａ，５０ｂ 最終ブロー型
５４ａ，５４ｂ 押圧部材
２８０ａ 第１の凹部の底部
２８０ｂ 第２の凹部の底部
２８４ａ、２８４ｂ 容器内側面
Ｏ 中心軸
Ｌ 長軸
Ｓ 短軸 DESCRIPTION OF SYMBOLS 10 Heat-resistant container 12 Neck part 14 Bottom part 16 Shoulder part 18 Body part 20 Heel part 22a, 22b Container side wall 23a, 23b Vertical rib 24 Label part 26 Holding part 28a 1st recessed part 28b 2nd recessed part 40 Preform 42 Primary blow Molded product 44 Intermediate container 50a, 50b Final blow molds 54a, 54b Press member 280a First recess bottom 280b Second recess bottom 284a, 284b Container inner side surface O Central axis L Long axis S Short axis

Claims (2)

合成樹脂製の容器の胴部に、容器内側に陥没して形成された対向する第１の凹部及び第２の凹部と、該第１の凹部と第２の凹部との間を連結する把持部と、を有する合成樹脂製の耐熱容器であって、
前記第１の凹部及び前記第２の凹部は、
容器内側へ向かって傾斜して形成された環状の側壁部と、
前記側壁部の容器内側の端部に形成された底部と、
を有し、
前記容器に充填された高温内容物が冷却されて前記容器の内部が減圧された際に、前記第１の凹部の底部の容器内側面は、前記第２の凹部の底部の容器内側面に接触することを特徴とする耐熱容器。 A first concave portion and a second concave portion which are formed in a body portion of a synthetic resin container so as to be depressed inside the container, and a gripping portion which connects the first concave portion and the second concave portion. A heat-resistant container made of synthetic resin having
The first recess and the second recess are
An annular side wall formed to be inclined toward the inside of the container;
A bottom formed at an end of the side wall inside the container;
Have
When the high-temperature content filled in the container is cooled and the inside of the container is depressurized, the inner surface of the container at the bottom of the first recess contacts the inner surface of the container at the bottom of the second recess. A heat-resistant container characterized by 請求項１に記載の耐熱容器に内容物が充填され、前記第１の凹部の底部の容器内側面と、前記第２の凹部の底部の容器内側面とが接触していることを特徴とする内容物入りの耐熱容器。   The heat-resistant container according to claim 1 is filled with contents, and the inner surface of the container at the bottom of the first recess is in contact with the inner surface of the container at the bottom of the second recess. Heat-resistant container with contents.
JP2005349135A 2005-12-02 2005-12-02 Heat-resistant container and heat-resistant container with contents Active JP4791163B2 (en)

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CA3039284C (en) 2011-12-27 2022-11-01 Yoshino Kogyosho Co., Ltd. Bottle container of a pinch-grip type, and movable inserts of a blow mold used to mold such a bottle container
US20130207317A1 (en) * 2012-02-13 2013-08-15 Christian Gerhard Friedrich Gerlach Process for making a stretch-blow molded container having an integral handle
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