JP3556320B2

JP3556320B2 - Molding method of bottle with handle

Info

Publication number: JP3556320B2
Application number: JP09645795A
Authority: JP
Inventors: 秀勝岡本
Original assignee: Mitsubishi Plastics Inc
Current assignee: Mitsubishi Plastics Inc
Priority date: 1995-04-21
Filing date: 1995-04-21
Publication date: 2004-08-18
Anticipated expiration: 2019-08-18
Also published as: JPH08290460A

Description

【０００１】
【産業上の利用分野】
本発明は、高温状態の液体を充填可能な把手付ボトルの成形方法に関する。
【０００２】
【従来の技術】
果汁、ミネラルウォーターなど高温状態の液体を充填する耐熱合成樹脂ボトルは知られており、その製法としてプリフォームを高温に加熱した金型内でブロー成形し、金型に数秒間密着させて熱処理する方法がある。
また、あらかじめ成形された把手の付いた合成樹脂ボトルも知られ、その製法として、例えば特開昭６３−９５９３１号に記載されているように、あらかじめ成形された把手を配置する部分が設けられた金型を用い、プリフォーム内に高圧のブローエアを吹き込んで金型内面に沿わせるようにしてボトルを成形すると共に、把手の嵌合部にプリフォームの壁を巻き付かせて把手を取り付け、底型をボトル下方に抜くと共に、胴型をボトル横方向に開いてボトルを取り出す方法が知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、後者の従来の把手付ボトルの耐熱性を向上するため、前者の熱処理方法を適用しようとすると、把手嵌合部付近は中心に近くて延伸度合が小さく肉厚が大きいため、加熱によると白濁が生じやすいものであり、これを避けるため熱処理温度を低く抑えると、得られた把手付ボトルの耐熱性が不十分となり、高温の液体を充填すると熱変形して正立しなくなるなどの品質不良が生ずるおそれがあった。本発明は、冷却の条件を工夫し、得られたボトルの前後方向および左右方向の直径を調整して収縮性のバランスを設定することにより、高温の液体を充填したときボトルが把手対向側に傾いたりするのを防ぐようにしたボトルの成形方法を提供するものである。
【０００４】
【課題を解決するための手段】
上記課題を解決するための本発明は、嵌合部を有する把手をあらかじめ挿入した金型内で７０℃以上１３０℃以下に加熱したプリフォームを二軸延伸ブロー成形して、その嵌合部にプリフォーム壁を巻き付かせて把手付ボトルとする方法において、金型の胴型の温度を８０℃以上２００℃以下とし、底型の温度を５０℃以上１５０℃以下としておくと共に、ボトル本体をブロー成形し、金型に数秒間密着させて熱処理し、その後にブローエアを排気すると共に、ボトル本体中心から見て把手取付け方向と略々直交方向のボトル本体側面部により多く冷却媒体が当たるように、ボトル本体内に位置させた中空延伸ロッドの周側に形成した孔を通して冷却媒体を噴出させ、ボトル本体を内部より冷却して取り出すようにした把手付ボトルの成形方法を特徴とするものである。
【０００５】
上記直交方向の側面部により多くの冷却媒体が当たるようにするために、中空延伸ロッドの構成を、上記直交方向に向けて孔を明けた構成のものとするか、または、三方向以上に向けて明けた孔の内、上記直交方向に向けた孔の数を多くするか孔径を大きくするかなどして、直交方向の孔の開口率が他の方向の孔よりも大きくなるように構成のものとするのが好ましい。
【０００６】
また、本発明は、さらに、把手取付け位置のボトル本体側面部とその対向側面部とを結ぶボトル本体の直径を、これと直交方向の側面部を結ぶボトル本体の直径に対して０．９５〜０．９７の長さ比となるように成形される把手付ボトルの成形方法を特徴とする。上記ボトル本体の形状は、胴形が横断面で円状、多角形状、その他の任意形状とすることができ、かつ凹凸条、凹凸面などの形成も任意である。この場合、前記の直径は胴部の仮想内接円又は外接円に相当する円の直径として考慮される。

【０００７】
【作用】
冷却媒体がより多く当たる前記直交方向の側面部に対して相対的に高い冷却温度で処理された把手取付け側の対向側面部が離型時に若干収縮（水平断面において中心側に収縮、以下同じ）した状態でボトルが成形される一方、このボトルに高温液体を充填すれば、熱処理が相対的に少ない上記直交方向の側面部が把手取付け位置の側面部とその対向側面部に比して若干大きく収縮し、結果としてボトルの正立状態の保持が実現することになる。
【０００８】
【実施例】
以下、本発明の一実施例を図面によって説明する。
図１は本発明に係る把手付ボトルの成形状態図、図２はそのＩＩ−ＩＩ線断面図、図３は延伸ロッドの変形例図、図４は把手付ボトルの側面図と底面略図である。
【０００９】
本発明に係る把手付ボトル１は、図１，２に示すように、両端部をボトル本体２への嵌合部３ａとした把手３をあらかじめ金型１０に挿入し、この金型１０内で７０℃以上１３０℃以下に加熱したプリフォーム４を二軸延伸ブロー成形し、上記嵌合部３ａにプリフォーム４の壁を巻き付かせて成形してなるものであり、金型１０の胴型１０ａ，１０ｂの温度を８０℃以上２００℃以下とし、底型１１の温度を５０℃以上１５０℃以下としておくと共に、ブローエアを送り込んでボトル本体２をブロー成形し、金型に数秒間密着させて熱処理した後、ブローエアを排気した後に、中空の延伸ロッド２１から、周側に形成してある孔２２を通して冷却媒体をボトル本体２内に噴出させ、この噴出は、ボトル本体２の中心軸から見て把手３の取付け方向（把手側と対向側とを結ぶ方向）Ｂのボトル本体側面部よりも、これと略々直交方向Ａの側面部により多く冷却媒体が当たるように行い、つまり、把手３の取付け方向がその直交方向より高温になっているようにしつつ冷却し、ボトル本体２を内部より冷却して成形してなるものである。
【００１０】
プリフォーム４の材質としては、特にポリエチレンテレフタレート等のポリエステル樹脂が加熱により耐熱性を向上できるので好ましい。プリフォーム４はあらかじめ７０℃以上１３０℃以下の延伸温度範囲に加熱しておく必要がある。
また、このプリフォーム４は、図１に示すようにあらかじめ少なくとも口栓部５天面近辺、望ましくはネックリング部６までを加熱して結晶化処理して白化させるのが好ましい。このことで高温充填時の口栓部５の変形による内容物の漏れや空気の侵入をなくすことができる。
【００１１】
ブロー成形用金型１０の胴型１０ａ，１０ｂの温度は８０℃以上２００℃以下の範囲とし、底型１１の温度は５０℃以上１５０℃以下、望ましくは９０℃以上１２０℃以下の範囲にしておく。
胴型１０ａ，１０ｂの温度が８０℃未満では、成形したボトル１の胴部に耐熱性が付与されず、高温充填時に変形が発生する。また、２００℃を越えると把手３の嵌合部３ａまでの巻き付き不良の発生およびこの近辺の白濁が発生する。底型１１の温度が５０℃未満では、得られたボトル１の底部７の耐熱性が乏しく、１５０℃を越えると成形時に変形する。
【００１２】
上記胴型１０ａ，１０ｂは、それぞれの内部に設けられた図示しない温水配管等により保温されており、成形後のボトル１を２〜１０秒間、特に好ましくは４〜８秒間接触させて熱処理を行い、耐熱性を向上させるようにしてある。
【００１３】
中空の延伸ロッド２１は、ボトル本体２の底部７付近まで進入可能に設置し、その周面には、ボトル本体２の中心と把手３とを結ぶ垂直断面に沿う横方向、即ち把手取付け方向Ｂには孔２２を形成せず、この方向Ｂと略々直交方向Ａの側面に孔２２を形成し、かつロッド長手方向には適宜間隔を置いて複数個形成し、冷却媒体が上記直交方向Ａのボトル本体２の側面部分に当たってから本体内に充満し、口元より系外に排出（図１の矢視状態）されるようにしてある。冷却時間は２〜１０秒間、特に好ましくは４〜８秒間がよい。冷却媒体としては、空気等の気体が好ましく、この場合、ロッド内圧で２０〜４０ｋｇ／ｃｍ^２程度が好ましい。
なお、上記孔２２は丸孔として図示してあるが、孔形状は任意であり、細長溝条の孔などであってもよい。
【００１４】
上記孔２２は、把手取付け方向Ｂにも明けることが可能である。この場合には図３（１）に示すように、把手取付け方向Ｂの孔２２よりも直交方向Ａの孔２２が同径で数多くなるように形成するか、同（２）に示すように、把手取付け方向Ｂの孔２２の径を小径とし、直交方向Ａの孔２２を同数で大径となるように形成し、或いはこれらの混合態様とするなどが可能であり、いずれにしても上記直交方向Ａのボトル本体２の側面部分により多く冷却媒体が当たるように形成するものとする。
【００１５】
上記のようにして成形した把手付ボトル１は、冷却媒体がより多く当たる上記直交方向Ａの側面部に対して相対的に高い冷却温度で処理された把手取付け側の対向側面部が離型時に若干収縮し、把手取付け位置の側面部は把手によってほとんど収縮しない状態で形成され、従って上記把手取付け方向Ｂのボトル本体２下部の直径Ｓが上記直交方向Ａのボトル本体２下部の直径Ｌよりも若干短い横断面楕円状、すなわち、Ｌ：Ｓ＝１：０．９５〜０．９７に形成される。
上記冷却媒体による冷却程度は、胴下部の横断面が真円状のブロー成形用金型１０を使用した場合でもボトル本体が上記長短比の状態となるように設定するものである。
【００１６】
ボトル本体２の直径比が上記の時、成形時のボトル１は若干傾斜した形態となるが、高温液体を充填すると、上記直交方向Ａと把手取付け方向Ｂの側面の収縮程度が異なり、熱処理が相対的に少ない上記直交方向Ａの側面部が把手取付け方向Ｂの側面部、特に把手取付け位置の対向側面部に比して若干大きく収縮し、真円に近くなるとともにボトル傾斜が小さくなり、把手付ボトル１はほぼ正立することになる。
【００１７】
なお、上記においてボトル本体２の横断面形状を楕円状として述べたが、この形状は変形円状、多角形状、その他の任意形状とすることができるものであって限定されるものではない。
金型１０の底型１１には、図示しない凹凸のリブ形状を形成しておくのが好ましく、これによって成形された把手付ボトル１の底部７には、対応する凹凸リブが形成されて底部７の強度を向上させると共に、液体充填時の変形を防止することができる。
【００１８】
表１は、上記本発明に係る成形方法によって成形した実施例１及び実施例２の把手付ボトルと、四側面すべてに同一孔を形成してなる延伸ロッドを用いて成形してなる対比例としての把手付ボトルとの成形状態を比較したものである。
なお、上記以外はいずれも同金型により同一条件で成形したものである。
【００１９】
表１において、「ボトル高さの差」は、成形ボトル垂直高さの最大値から垂直高さの最小値を引いた寸法差を示しており、この高さの差が大きい程傾斜度が大きく、高さの差が小さい程正立に近いことを意味する。
「ボトル取出時」は、金型から取出した直後の成形ボトルを指し、「高温充填時」は、７０℃温水をネックリング部６近くまで充填後、密栓し、２４時間常温にて保存した後の成形ボトルを指す。
【００２０】
【表１】

【００２１】
実施例１，２は、ボトル胴径の長径Ｌ：短径Ｓ＝１：０．９５〜１：０．９７の範囲であるが、ボトル取出時にボトルは傾斜しているものの、高温液体の充填後は傾斜が小さくなり、ほぼ正立することが確認された。
しかし、同比が１：１の対比例では、ボトル取出時に正立しているものの、高温液体充填後に傾斜し、正立しない場合が生じ、商品となり難いという品質問題が生じた。
【００２２】
【発明の効果】
以上のように、本発明によれば、延伸ロッドからの冷却媒体を把手取付け方向に比して直交方向の側面部により多く当てることにより、従来とは異なる把手付ボトルを成形することができ、このボトルによれば、高温液体の充填後にボトルが傾斜することなく、ほぼ正立するので、安定して載置可能な液体充填ボトルを提供することができる。
【図面の簡単な説明】
【図１】本発明に係る把手付ボトルの成形状態図である。
【図２】図１のＩＩ−ＩＩ線断面図である。
【図３】図１，２に示した延伸ロッドの変形例を示し、（１）は変形の一例を示す延伸ロッドの部分側面図とその横断面図、（２）は別の変形の一例を示す延伸ロッドの部分側面図とその横断面図である。
【図４】成形された把手付ボトルを示し、（１）はその側面図、（２）はその底面略図である。
【符号の説明】
１把手付ボトル
２ボトル本体
３把手
３ａ把手の嵌合部
４プリフォーム
７底部
１０金型
１０ａ胴型
１０ｂ胴型
１１底型
２１延伸ロッド
２２孔
Ａ直交方向
Ｂ把手取付け方向
Ｌ長径
Ｓ短径[0001]
[Industrial applications]
The present invention relates to a method for forming a bottle with a handle that can be filled with a liquid in a high temperature state .
[0002]
[Prior art]
Heat-resistant synthetic resin bottles that are filled with high-temperature liquids such as fruit juice and mineral water are known. As a manufacturing method, a preform is blow-molded in a mold heated to a high temperature, and the preform is heat-bonded to the mold for several seconds. There is a way.
A synthetic resin bottle with a preformed handle is also known. As a method of manufacturing the same, for example, a portion for disposing a preformed handle is provided as described in JP-A-63-95931. Using a mold, high-pressure blow air is blown into the preform to form the bottle along the inner surface of the mold, and the wall of the preform is wrapped around the fitting part of the handle to attach the handle. A method is known in which the mold is pulled out below the bottle, and the body mold is opened in the lateral direction of the bottle to take out the bottle.
[0003]
[Problems to be solved by the invention]
However, in order to improve the heat resistance of the conventional bottle with a handle, if the heat treatment method of the former is applied, the vicinity of the handle fitting portion is close to the center and the degree of stretching is small and the wall thickness is large. If the heat treatment temperature is kept low to avoid this, the heat resistance of the resulting bottle with handle will be insufficient, and if filled with a high temperature liquid, it will be deformed by heat and will not be erect. There was a risk of failure. The present invention devises cooling conditions, adjusts the diameter in the front-rear direction and the left-right direction of the obtained bottle, and sets the balance of shrinkage, so that when the high-temperature liquid is filled, the bottle is positioned on the side opposite to the handle. It is an object of the present invention to provide a method for molding a bottle in which the bottle is prevented from tilting.
[0004]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problem is to perform biaxial stretch blow molding of a preform heated to 70 ° C. or more and 130 ° C. or less in a mold in which a handle having a fitting portion is inserted in advance, and In the method of winding a preform wall into a bottle with a handle, the temperature of a mold body is set to 80 ° C or more and 200 ° C or less, and the temperature of a bottom mold is set to 50 ° C or more and 150 ° C or less, and the bottle body is Blow molding, heat treatment by contacting the mold with the mold for several seconds, and then exhausting the blow air so that more cooling medium hits the side of the bottle body in the direction substantially perpendicular to the handle mounting direction when viewed from the center of the bottle body. A method of forming a bottle with a handle, in which a cooling medium is ejected through a hole formed on a peripheral side of a hollow stretched rod located in the bottle body to cool the bottle body from the inside and take it out. The one in which the features.
[0005]
In order to allow more cooling medium to hit the side surfaces in the orthogonal direction, the configuration of the hollow stretched rod may be a configuration in which holes are drilled in the orthogonal direction, or in three or more directions. Of the holes drilled, the number of holes directed in the orthogonal direction is increased or the hole diameter is increased so that the aperture ratio of the holes in the orthogonal direction is larger than the holes in other directions. It is preferred that
[0006]
In addition, the present invention further provides a bottle body connecting the side of the bottle body at the handle mounting position and the opposite side to a diameter of 0.95 to the diameter of the bottle body connecting the side in a direction perpendicular thereto. The method is characterized by a method for forming a bottle with a handle formed to have a length ratio of 0.97. The shape of the bottle main body can be a circular shape, a polygonal shape, or any other arbitrary shape in the cross section, and the formation of uneven stripes and uneven surfaces is also optional. In this case, the diameter is considered as the diameter of a circle corresponding to a virtual inscribed circle or a circumscribed circle of the trunk.

[0007]
[Action]
The opposite side portion on the handle mounting side, which has been treated at a relatively high cooling temperature with respect to the side surface portion in the orthogonal direction to which the cooling medium is more applied, slightly shrinks upon release from the mold (shrinks toward the center in a horizontal cross section, the same applies hereinafter). When the bottle is filled with a high-temperature liquid while the bottle is formed in a state in which the heat treatment is performed, the side portion in the orthogonal direction, which has relatively little heat treatment, is slightly larger than the side portion at the handle mounting position and the opposite side portion. It shrinks, resulting in the bottle being held upright.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a molding state of a bottle with a handle according to the present invention, FIG. 2 is a sectional view taken along the line II-II, FIG. 3 is a modified example of an elongated rod, and FIG. 4 is a side view and a schematic bottom view of the bottle with a handle. .
[0009]
In the bottle with handle 1 according to the present invention, as shown in FIGS. 1 and 2, a handle 3 having both ends fitted to the bottle body 2 is inserted into a mold 10 in advance. The preform 4 heated to 70 ° C. or more and 130 ° C. or less is formed by biaxial stretch blow molding, and is formed by winding the wall of the preform 4 around the fitting portion 3a. The temperature of 10a and 10b is set to 80 ° C. or more and 200 ° C. or less, the temperature of the bottom mold 11 is set to 50 ° C. or more and 150 ° C. or less, and blown air is blown to blow-mold the bottle main body 2 and adhered to the mold for several seconds. After the heat treatment, the blow air is exhausted, and then the cooling medium is ejected from the hollow stretching rod 21 into the bottle body 2 through the hole 22 formed on the peripheral side, and this ejection is viewed from the central axis of the bottle body 2. Installing handle 3 Direction (direction connecting the handle side and the opposite side), the cooling medium is applied more to the side surface in the direction A substantially orthogonal to the side of the bottle body in the direction B than the side of the bottle main body. The bottle body 2 is cooled while keeping the temperature higher than the orthogonal direction, and the bottle body 2 is cooled and molded from the inside.
[0010]
As the material of the preform 4, a polyester resin such as polyethylene terephthalate is particularly preferable because heat resistance can be improved by heating. It is necessary to preheat the preform 4 to a stretching temperature range of 70 ° C. or more and 130 ° C. or less.
Further, as shown in FIG. 1, it is preferable that the preform 4 is heated at least in the vicinity of the top surface of the plug portion 5, preferably up to the neck ring portion 6, and subjected to a crystallization treatment to whiten the preform 4. This makes it possible to prevent leakage of contents and intrusion of air due to deformation of the plug portion 5 at the time of high-temperature filling.
[0011]
The temperature of the body dies 10a and 10b of the blow molding die 10 is in the range of 80 ° C to 200 ° C, and the temperature of the bottom mold 11 is in the range of 50 ° C to 150 ° C, preferably 90 ° C to 120 ° C. deep.
If the temperature of the body dies 10a and 10b is lower than 80 ° C., heat resistance is not given to the body of the molded bottle 1 and deformation occurs during high-temperature filling. On the other hand, if the temperature exceeds 200 ° C., poor winding of the handle 3 up to the fitting portion 3a and cloudiness near the portion will occur. If the temperature of the bottom mold 11 is lower than 50 ° C., the heat resistance of the bottom portion 7 of the obtained bottle 1 is poor.
[0012]
The body dies 10a and 10b are kept warm by hot water pipes and the like (not shown) provided inside the body dies 10a and 10b, and heat-treated by contacting the molded bottle 1 for 2 to 10 seconds, particularly preferably 4 to 8 seconds. , To improve heat resistance.
[0013]
The hollow extending rod 21 is installed so as to be able to enter near the bottom 7 of the bottle body 2, and has a circumferential surface on a lateral direction along a vertical section connecting the center of the bottle body 2 and the handle 3, that is, a handle mounting direction B. No holes 22 are formed, and holes 22 are formed on the side surface in a direction A substantially perpendicular to the direction B, and a plurality of holes 22 are formed at appropriate intervals in the longitudinal direction of the rod. After being hit on the side surface of the bottle body 2, the inside of the body is filled and discharged from the mouth to the outside of the system (as viewed in the direction of the arrow in FIG. 1). The cooling time is preferably 2 to 10 seconds, particularly preferably 4 to 8 seconds. As the cooling medium, a gas such as air is preferable, and in this case, the internal pressure of the rod is preferably about ²⁰ to 40 kg / cm ² .
Although the hole 22 is illustrated as a round hole, the hole shape is arbitrary, and may be an elongated groove hole or the like.
[0014]
The hole 22 can be opened in the handle mounting direction B. In this case, as shown in FIG. 3A, the number of holes 22 in the orthogonal direction A is larger than the number of holes 22 in the handle mounting direction B with the same diameter, or as shown in FIG. It is possible to make the diameter of the hole 22 in the handle mounting direction B small and to form the same number of holes 22 in the orthogonal direction A to have a large diameter, or to use a mixture of these. The cooling medium is formed so as to hit the side portion of the bottle body 2 in the direction A more.
[0015]
The bottle with handle 1 molded as described above has a side surface portion on the handle mounting side which has been treated at a relatively high cooling temperature with respect to the side surface portion in the orthogonal direction A to which more cooling medium is applied when the mold is released. The handle is slightly contracted, and the side surface at the handle mounting position is formed in a state where it is hardly contracted by the handle. Therefore, the diameter S of the lower part of the bottle body 2 in the handle mounting direction B is larger than the diameter L of the lower part of the bottle body 2 in the orthogonal direction A. It is formed in a slightly shorter cross-sectional elliptical shape, that is, L: S = 1: 0.95-0.97.
The degree of cooling by the cooling medium is set so that the bottle main body has the above-mentioned length-to-short ratio state even when the blow molding die 10 having a true circular cross section at the lower part of the body is used.
[0016]
When the diameter ratio of the bottle body 2 is as described above, the bottle 1 at the time of molding has a slightly inclined form, but when filled with a high-temperature liquid, the degree of shrinkage of the side surfaces in the orthogonal direction A and the handle mounting direction B is different, and heat treatment is not performed. The side portion in the orthogonal direction A, which is relatively small, shrinks slightly more than the side portion in the handle mounting direction B, particularly the opposite side portion at the handle mounting position, becomes closer to a perfect circle, and the bottle inclination becomes smaller. The attached bottle 1 is almost upright.
[0017]
In the above, the cross-sectional shape of the bottle body 2 is described as an ellipse, but this shape can be a deformed circular shape, a polygonal shape, or any other shape, and is not limited.
It is preferable that the bottom mold 11 of the mold 10 is formed with an uneven rib shape (not shown), and a corresponding uneven rib is formed on the bottom 7 of the bottle with handle 1 formed by this. And the deformation at the time of liquid filling can be prevented.
[0018]
Table 1 shows the bottles with the handles of Examples 1 and 2 molded by the molding method according to the present invention and a comparative example formed by using a stretched rod having the same hole formed on all four sides. Of the molding state of the bottle with a handle.
Except for the above, all were molded using the same mold under the same conditions.
[0019]
In Table 1, the “difference in bottle height” indicates a dimensional difference obtained by subtracting the minimum value of the vertical height from the maximum value of the vertical height of the molded bottle. The greater the difference in height, the greater the inclination. The smaller the height difference, the closer to erect.
“At the time of removing the bottle” refers to the molded bottle immediately after being removed from the mold, and “at the time of filling at a high temperature” refers to filling the bottle with 70 ° C. hot water up to the vicinity of the neck ring portion 6, sealing the bottle, and storing at room temperature for 24 hours. Refers to the molded bottle.
[0020]
[Table 1]

[0021]
In Examples 1 and 2, the major axis L: the minor axis S of the bottle body diameter is in the range of 1: 0.95 to 1: 0.97, but the bottle is inclined when the bottle is taken out, but is filled with the high-temperature liquid. After that, it was confirmed that the inclination was small and almost upright.
However, if the ratio is 1: 1, the bottle is erect at the time of taking out the bottle, but tilts after filling with the high-temperature liquid, and the bottle may not be erect.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to mold a bottle with a handle different from the conventional one by applying more cooling medium from the stretching rod to the side surface in the orthogonal direction as compared with the handle mounting direction. According to this bottle, the bottle is substantially upright without tilting after filling with the high-temperature liquid, so that a liquid-filled bottle that can be stably placed can be provided.
[Brief description of the drawings]
FIG. 1 is a molding state diagram of a bottle with a handle according to the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIGS. 3A and 3B show modified examples of the stretched rod shown in FIGS. 1 and 2; FIG. 3A is a partial side view of the stretched rod showing an example of the deformation and a cross-sectional view thereof; FIG. 2 is a partial side view and a cross-sectional view of the drawn rod shown.
FIG. 4 shows a molded bottle with a handle, (1) is a side view thereof, and (2) is a schematic bottom view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottle with handle 2 Bottle main body 3 Handle 3a Handle fitting part 4 Preform 7 Bottom 10 Mold

10a Body mold

10b Body mold 11 Bottom mold 21 Extension rod 22 Hole A Orthogonal direction B Handle mounting direction L Long diameter S Short diameter

Claims

A preform heated to 70 ° C or higher and 130 ° C or lower is biaxially stretch blow-molded in a mold in which a handle having a fitting portion is inserted in advance, and the preform wall is wound around the fitting portion to form a bottle with a handle. In the method of molding, the temperature of the body of the mold is set to 80 ° C. or more and 200 ° C. or less, and the temperature of the bottom mold is set to 50 ° C. or more and 150 ° C. or less. A hollow stretch rod positioned inside the bottle body so that the cooling medium hits the side of the bottle body in a direction that is substantially perpendicular to the direction in which the handle is attached when viewed from the center of the bottle body. A method for forming a bottle with a handle, characterized in that a cooling medium is jetted out through a hole formed on a peripheral side of the bottle and the bottle body is cooled and taken out from the inside.

The diameter of the bottle body connecting the bottle body side surface at the handle mounting position and the opposing side surface is 0.95 to 0.97 with respect to the diameter of the bottle body connecting the side surface in the orthogonal direction to the bottle body. The method for molding a bottle with a handle according to claim 1, wherein the bottle is molded.