JP2016030428A - Blow molding container - Google Patents

Blow molding container Download PDF

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JP2016030428A
JP2016030428A JP2014155119A JP2014155119A JP2016030428A JP 2016030428 A JP2016030428 A JP 2016030428A JP 2014155119 A JP2014155119 A JP 2014155119A JP 2014155119 A JP2014155119 A JP 2014155119A JP 2016030428 A JP2016030428 A JP 2016030428A
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preform
central axis
blow
mouth
blow molding
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JP6280832B2 (en
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雄一 奥山
Yuichi Okuyama
雄一 奥山
満 塩川
Mitsuru Shiokawa
満 塩川
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Yoshino Kogyosho Co Ltd
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Yoshino Kogyosho Co Ltd
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    • 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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a blow molding container which is producible without use of a preform of a special shape or a special heating method and whose trunk part is in a flat shape, optionally with the central axis line of the trunk part being eccentric to the central axis line of the mouth part.SOLUTION: A blow molding container 1 is produced by two-axially oriented blow molding which comprises laying an injection-molded bottomed cylindrical preform in a die for blow molding and supplying a pressurized liquid to the inside of the preform so as to mold to a shape along a cavity of the die and includes a cylindrical mouth part 2, a hollow trunk part 3 communicating with the mouth part 2, and a bottom part 4 which blocks a lower-end opening part of the trunk part 3. The trunk part 3 is in a flat shape in a cross section perpendicular to the central axis line C1 of the trunk part 3.SELECTED DRAWING: Figure 1

Description

本発明は、ブロー成形により製造されるブロー成形容器に関する。   The present invention relates to a blow molded container manufactured by blow molding.

延伸ポリプロピレン（ＯＰＰ）製の壜体やポリエチレンテレフタレート（ＰＥＴ）製の壜体（ペットボトル）に代表されるような樹脂製の壜体は、洗剤用、飲料用、食品用、化粧料用等の様々な用途に使用されている。   Resin casings such as those made of drawn polypropylene (OPP) and polyethylene terephthalate (PET) are used for detergents, beverages, foods, cosmetics, etc. It is used for various purposes.

このような壜体を製造する方法としては、射出成形により有底筒状に形成された樹脂製のプリフォームを、延伸効果を発現させることのできる温度にまで加熱し、この状態でブロー成形装置の金型に設置して、延伸ロッドによりプリフォームを縦方向（軸方向）に延伸させつつ、プリフォーム内に加圧した空気を供給してプリフォームを横方向（径方向）に延伸させて、プリフォームを金型のキャビティに沿った形状の壜体に成形する、エアブローによる２軸延伸ブロー成形が知られている（特許文献１参照）。   As a method of manufacturing such a casing, a resin preform formed into a bottomed cylindrical shape by injection molding is heated to a temperature at which a stretching effect can be exhibited, and in this state, a blow molding apparatus The preform is stretched in the longitudinal direction (axial direction) with a stretching rod, and the preform is stretched in the lateral direction (radial direction) by supplying pressurized air into the preform. A biaxial stretch blow molding by air blow is known in which a preform is molded into a casing having a shape along a cavity of a mold (see Patent Document 1).

特開平５−２４０９９号公報Japanese Patent Laid-Open No. 5-24099

しかしながら、容器胴部の中心軸線に垂直な断面において、互いに直交する長軸および短軸を有する扁平形状の扁平容器を、上記のようなエアブローによる２軸延伸ブロー成形で製造しようとすると、金型に設置したプリフォームの外面から当該金型のキャビティまでの距離が長軸側と短軸側とで異なるため、延伸量に差が生じて肉厚が不均一となり、場合によっては延伸量が大きい部分（長軸側）が薄肉となりすぎ、孔空きが生じるおそれがあるという問題があった。   However, when a flat container having a flat shape having a major axis and a minor axis perpendicular to each other in a cross section perpendicular to the central axis of the container body portion is to be manufactured by biaxial stretch blow molding by air blow as described above, Since the distance from the outer surface of the preform placed on the mold to the cavity of the mold is different between the major axis side and the minor axis side, a difference occurs in the stretching amount, resulting in uneven thickness, and in some cases, the stretching amount is large. There was a problem that the portion (long axis side) was too thin and a perforation might occur.

また、容器の口部の中心軸線に対して胴部の中心軸線が偏心している（つまり、口部の中心軸線と胴部の中心軸線とが同一直線上にない）偏心形状の容器を、エアブローによる２軸延伸ブロー成形する場合にも、上記の扁平容器の場合と同様に、金型に設置したプリフォームの外面から当該金型のキャビティまでの距離が周方向に均一でないため、容器を適切な肉厚で形成することが難しく、製造が困難であった。   In addition, the center axis of the barrel is eccentric with respect to the center axis of the container mouth (that is, the center axis of the mouth and the center axis of the trunk are not collinear) In the case of biaxial stretch blow molding by the same method as in the case of the above flat container, the distance from the outer surface of the preform placed on the mold to the cavity of the mold is not uniform in the circumferential direction. It was difficult to form with a thick wall and it was difficult to manufacture.

このような問題を解消する方法として、例えば、周方向に厚みを変化させた特殊な形状のプリフォームを成形し、キャビティまでの距離が大きい位置にプリフォームの厚肉部分が位置するよう金型に配置してエアブローする方法が考えられる。しかしながら、この場合には、特殊な形状のプリフォームを成形しなければならず、さらに、金型に対してプリフォームを正確に位置決めする必要があるため、装置の構造が複雑になり、寸法精度や成形効率が悪化する虞がある。   As a method for solving such a problem, for example, a preform having a special shape with a thickness changed in the circumferential direction is formed, and a mold is formed so that a thick portion of the preform is positioned at a position where the distance to the cavity is large. A method of arranging the air blower and air blowing is conceivable. However, in this case, a preform with a special shape must be molded, and the preform must be accurately positioned with respect to the mold, which complicates the structure of the device and increases the dimensional accuracy. In addition, the molding efficiency may be deteriorated.

また、他の方法として、周方向に温度差が形成されるようにプリフォームを特殊な加熱方法で加熱して、キャビティまでの距離が大きい位置に比較的低温の部分が位置するよう金型に配置する方法が考えられる。この場合、エアブロー時にはプリフォームの低温部分よりも高温部分が優先的に延伸するので、キャビティまでの距離が大きい部分の肉厚が薄くなり過ぎるのを防止することができるが、この場合にも、加熱したプリフォームをブロー成形用の金型に設置する際の正確な位置決めが必要となることに加え、加熱設備も複雑なものとなってしまう。   As another method, the preform is heated by a special heating method so that a temperature difference is formed in the circumferential direction so that a relatively low temperature portion is located at a position where the distance to the cavity is large. A method of arranging can be considered. In this case, at the time of air blowing, the high temperature portion is preferentially stretched over the low temperature portion of the preform, so that it is possible to prevent the thickness of the portion where the distance to the cavity is large from becoming too thin. In addition to the need for accurate positioning when the heated preform is placed in a blow mold, the heating equipment becomes complicated.

それゆえ本発明は、特殊な形状のプリフォームや特殊な加熱方法を用いることなく製造可能な、胴部が扁平形状の、又は、口部の中心軸線に対して胴部の中心軸線が偏心しているブロー成形容器を提供することを目的とする。   Therefore, the present invention can be manufactured without using a preform having a special shape or a special heating method. The trunk portion is flat, or the central axis of the trunk portion is decentered with respect to the central axis of the mouth portion. An object of the present invention is to provide a blow molded container.

本発明は、上記課題を解決するためになされたものであり、本発明のブロー成形容器は、有底筒状のプリフォームをブロー成形用の金型に装着した後、加圧した液体を該プリフォームの内部に供給して、該金型のキャビティに沿った形状に成形する２軸延伸ブロー成形により製造されたブロー成形容器であって、
筒状の口部と、該口部に連なる中空の胴部と、該胴部の下端開口部を閉塞する底部と、を備え、
前記胴部は該胴部の中心軸線に垂直な断面において扁平形状である、又は、前記口部の中心軸線に対して該胴部の中心軸線が偏心していることを特徴とする。 The present invention has been made to solve the above-mentioned problems, and the blow-molded container of the present invention comprises a bottomed cylindrical preform mounted on a mold for blow molding, and then a pressurized liquid is added to the blow-molded container. A blow molded container manufactured by biaxial stretch blow molding, which is supplied into a preform and molded into a shape along the cavity of the mold,
A cylindrical mouth part, a hollow body part connected to the mouth part, and a bottom part closing the lower end opening of the body part,
The trunk is flat in a cross section perpendicular to the central axis of the trunk, or the central axis of the trunk is eccentric with respect to the central axis of the mouth.

また、本発明のブロー成形容器は、有底筒状のプリフォームをブロー成形用の金型に装着した後、加圧した液体を該プリフォームの内部に供給して、該金型のキャビティに沿った形状に成形する２軸延伸ブロー成形により製造されたブロー成形容器であって、
筒状の口部と、該口部に連なる中空の胴部と、該胴部の下端開口部を閉塞する底部と、を備え、
前記胴部は該胴部の中心軸線に垂直な断面において扁平形状であり、且つ、前記口部の中心軸線に対して該胴部の中心軸線が偏心していることを特徴とする。 Further, the blow molded container of the present invention, after mounting a bottomed cylindrical preform on a blow mold, supplies pressurized liquid to the inside of the preform, and into the cavity of the mold. A blow molded container manufactured by biaxial stretch blow molding to be molded into a shape along the shape,
A cylindrical mouth part, a hollow body part connected to the mouth part, and a bottom part closing the lower end opening of the body part,
The trunk is flat in a cross section perpendicular to the central axis of the trunk, and the central axis of the trunk is eccentric with respect to the central axis of the mouth.

本発明によれば、特殊な形状のプリフォームや特殊な加熱方法を用いることなく製造可能な、胴部が扁平形状の、又は、口部の中心軸線に対して胴部の中心軸線が偏心しているブロー成形容器を提供することが可能となる。   According to the present invention, the body can be manufactured without using a specially shaped preform or a special heating method, the body is flat, or the center axis of the body is decentered with respect to the center axis of the mouth. It is possible to provide a blow molded container.

本発明の一実施形態に係るブロー成形容器の正面図である。It is a front view of the blow molding container concerning one embodiment of the present invention. （ａ）は、図１のブロー成形容器におけるＡ−Ａ断面図であり、（ｂ）は、図１に示すブロー成形容器の平面図である。(A) is AA sectional drawing in the blow molding container of FIG. 1, (b) is a top view of the blow molding container shown in FIG. 本発明の一実施形態に係るブロー成形容器を製造する際に用いるプリフォームの一例を示す図である。It is a figure which shows an example of the preform used when manufacturing the blow molding container which concerns on one Embodiment of this invention.

以下、図面を参照しつつ、本発明をより具体的に説明する。図１は、本発明の一実施形態に係るブロー成形容器１の正面図である。   Hereinafter, the present invention will be described more specifically with reference to the drawings. FIG. 1 is a front view of a blow molded container 1 according to an embodiment of the present invention.

本実施形態のブロー成形容器１は、筒状の口部２と、当該口部２に連なる中空の胴部３と、該胴部３の下端開口部を閉塞する底部４と、を備える。   The blow-molded container 1 of the present embodiment includes a cylindrical mouth portion 2, a hollow body portion 3 that is continuous with the mouth portion 2, and a bottom portion 4 that closes the lower end opening of the body portion 3.

本実施形態において、口部２は円筒形状で外周面に外ねじ部５が設けられており、当該外ねじ部５に対応する内ねじ部を有するキャップ（図示しない）を着脱可能としている。また、外ねじ部５の下方には、口部２の外周面から突出するネックリング６が形成されている。   In the present embodiment, the mouth portion 2 has a cylindrical shape and is provided with an outer screw portion 5 on the outer peripheral surface, and a cap (not shown) having an inner screw portion corresponding to the outer screw portion 5 is removable. A neck ring 6 that protrudes from the outer peripheral surface of the mouth portion 2 is formed below the outer screw portion 5.

胴部３は、口部２の下端から、徐々に拡径しながら下方に延びる比較的小径な小径部７と、小径部７の下方に延び、比較的大径の主要部８とを有する。ここで、図１、２に示すように、本実施形態において胴部３の中心軸線Ｃ１は、口部２の中心軸線Ｃ２に平行で、上記主要部８の最大断面積位置における横断面であるＡ−Ａ断面の中心点を通る線としている。なお、本実施形態において胴部３の中心軸線Ｃ１および口部２の中心軸線Ｃ２は、図１に示すブロー成形容器１の正立姿勢において鉛直方向に延びるものとしている。   The body portion 3 has a relatively small diameter small diameter portion 7 extending downward from the lower end of the mouth portion 2 while gradually increasing the diameter, and a relatively large diameter main portion 8 extending below the small diameter portion 7. Here, as shown in FIGS. 1 and 2, in the present embodiment, the central axis C <b> 1 of the body portion 3 is parallel to the central axis C <b> 2 of the mouth portion 2 and is a cross section at the maximum cross-sectional area position of the main portion 8. The line passes through the center point of the AA cross section. In the present embodiment, the center axis C1 of the body portion 3 and the center axis C2 of the mouth portion 2 are assumed to extend in the vertical direction in the upright posture of the blow-molded container 1 shown in FIG.

また、胴部３の主要部８は、図２（ａ）に示すように、胴部３の中心軸線Ｃ１に垂直なＡ−Ａ断面において、相互に直交する長軸Ｌと短軸Ｓを有する扁平形状となっている。また、本実施形態のブロー成形容器１は、図１、２に示すように、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心している。なお、本実施形態のブロー成形容器１の形状は、胴部３が扁平形状であり、且つ、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心した形状としたが、これに限定されるものではない。すなわち、胴部３が扁平形状でなく円筒形状である場合でも、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心している形状であればよく、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心していない場合でも、胴部３が扁平形状であればよい。また、胴部３の形状は、本実施形態のように小径部７と主要部８を有する形状に限定されず、任意の中空形状とすることができ、部分的に凸部や凹部が形成された形状も含むものとする。   Moreover, the main part 8 of the trunk | drum 3 has the long axis L and the short axis S which are mutually orthogonal in the AA cross section perpendicular | vertical to the central axis C1 of the trunk | drum 3, as shown to Fig.2 (a). It has a flat shape. Moreover, as shown in FIGS. 1 and 2, in the blow-molded container 1 of the present embodiment, the center axis C <b> 1 of the body part 3 is eccentric with respect to the center axis C <b> 2 of the mouth part 2. The shape of the blow molded container 1 of the present embodiment is such that the body portion 3 is a flat shape and the center axis C1 of the body portion 3 is eccentric with respect to the center axis C2 of the mouth portion 2. It is not limited to this. That is, even when the trunk portion 3 is not flat but cylindrical, the center axis C1 of the trunk portion 3 may be eccentric with respect to the central axis C2 of the mouth portion 2, and the central axis of the mouth portion 2 is sufficient. Even when the central axis C1 of the body part 3 is not decentered with respect to C2, the body part 3 may be flat. Moreover, the shape of the trunk | drum 3 is not limited to the shape which has the small diameter part 7 and the main part 8 like this embodiment, It can be set as arbitrary hollow shapes, and a convex part and a recessed part are partially formed. Including other shapes.

以下に、上記のような構成を有するブロー成形容器１を製造する際の処理手順の一例について説明する。   Below, an example of the process sequence at the time of manufacturing the blow molding container 1 which has the above structures is demonstrated.

先ず、予め射出成形等により形成したプリフォームを、ブロー成形に適した温度に加熱してブロー成形用の金型に設置する。ここで、図３に示すように、プリフォーム１０としては、例えばポリプロピレンやポリエチレンテレフタレート等の樹脂材料により、全体として有底円筒状に形成され、その試験管形状となる本体部１１の上端に円筒状の口部１２が一体に設けられるとともに、口部１２の下端部にネックリング１３が一体に設けられた形状のものを用いることができる。また、プリフォーム１０の本体部１１の肉厚は周方向に均一とし、プリフォーム１０を射出成形する際のゲート位置は、中心軸線Ｃ３上で、本体部１１の下端１４に位置することが一般的である。このプリフォーム１０は、加熱した後、口部１２が金型の外部に突出し、本体部１１が金型のキャビティ内となるよう、その中心軸線Ｃ３に沿って配置される。またこの時、ネックリング１３が金型の上面に当接した状態で金型に装着される。   First, a preform formed in advance by injection molding or the like is heated to a temperature suitable for blow molding and placed in a blow molding die. Here, as shown in FIG. 3, the preform 10 is formed in a bottomed cylindrical shape as a whole by a resin material such as polypropylene or polyethylene terephthalate, and is cylindrical at the upper end of the main body portion 11 having the shape of the test tube. It is possible to use a shape in which the neck 12 is integrally provided with the neck ring 13 at the lower end of the mouth 12. The thickness of the main body 11 of the preform 10 is uniform in the circumferential direction, and the gate position when the preform 10 is injection-molded is generally located at the lower end 14 of the main body 11 on the central axis C3. Is. After the preform 10 is heated, the preform 10 is disposed along the central axis C3 so that the mouth 12 protrudes outside the mold and the main body 11 is in the cavity of the mold. At this time, the neck ring 13 is mounted on the mold in contact with the upper surface of the mold.

次いで、上下方向に移動自在の延伸ロッドを備えたノズルユニットを上方から配置してブローノズルを口部１２に嵌合させる。そして、延伸ロッドを下方に向けて移動させてプリフォーム１０を縦方向（軸方向）に延伸させつつ、ブローノズルを通してプリフォーム１０内に加圧し液体を供給してプリフォーム１０を横方向（径方向）に延伸させることにより、プリフォーム１０を金型のキャビティに沿った形状の壜体に成形する。なお、ブロー成形の際には、延伸ロッドを備えていないノズルユニットを用いることも可能であり、この場合、口部１２に嵌合させたブローノズルから加圧した液体を供給することにより、プリフォーム１０を縦方向（軸方向）及び横方向（径方向）に延伸させることができる。また、プリフォーム１０に加圧した液体を供給するための機構としては、例えば、電動モータにより駆動されるサーボプランジャータイプのプランジャーポンプを用いることができる。   Next, a nozzle unit having a stretching rod that is movable in the vertical direction is disposed from above, and the blow nozzle is fitted into the mouth portion 12. Then, while the stretching rod is moved downward to stretch the preform 10 in the longitudinal direction (axial direction), the preform 10 is pressurized in the preform 10 through a blow nozzle and supplied with a liquid so that the preform 10 is laterally (diametered). The preform 10 is formed into a casing having a shape along the cavity of the mold. In blow molding, it is possible to use a nozzle unit that does not include a stretching rod. In this case, by supplying a pressurized liquid from a blow nozzle fitted in the mouth portion 12, The reform 10 can be stretched in the longitudinal direction (axial direction) and the lateral direction (radial direction). As a mechanism for supplying pressurized liquid to the preform 10, for example, a servo plunger type plunger pump driven by an electric motor can be used.

以上、ブロー成形容器１の製造方法の一例を説明したが、製造に用いる装置や処理の手順は特に限定されるものではなく、加圧した液体を用いた２軸延伸ブロー成形であれば、任意の装置及び手順を採用することができる。   As mentioned above, although an example of the manufacturing method of the blow molding container 1 was demonstrated, the apparatus used for manufacture and the procedure of a process are not specifically limited, If it is biaxial stretch blow molding using the pressurized liquid, it is arbitrary. The following apparatus and procedure can be employed.

ここで、上記のような扁平形状のブロー成形容器１を、従来のような加圧エアを使用したエアブローによる２軸延伸ブロー成形で成形しようとした場合には、プリフォーム１０が径方向外側に向けて延伸する際に、キャビティまでの距離が小さい部分は延伸量が小さいため肉厚が厚くなる一方で、キャビティまでの距離が大きい部分は大きく延伸して肉厚が薄くなってしまい、薄肉部分に破断や孔空きが生じることがあるため、製造が困難であった。これに対して、本実施形態のように、プリフォーム１０内に加圧エア（気体）ではなく、加圧した液体を供給して成形する場合には、液体の熱伝達率が気体よりも高いため、ブロー成形時の冷却効率が高くなり、プリフォーム１０の温度低下が速くなる。なお、供給される加圧液体は、加熱したプリフォーム１０に比べて低い温度に設定されている。加圧液体の温度は、予め温度調節器具を用いて調節しても良いし、常温で管理しても良い。また、プリフォーム１０が延伸して肉厚が薄くなるほど温度が低下し易くなり、温度が低下すると、樹脂は延伸し難くなるため、ブロー成形の過程で、厚肉で温度の高い部分が優先的に延伸することとなり、肉厚が適切に分配されることとなる。その結果、加圧エアを使用した場合に比べて、加圧した液体を使用した場合には、適切な肉厚で成形することが可能となる。なお、図３に示すプリフォーム１０において、中心軸線Ｃ３上の、本体部１１の下端１４に位置していたゲート位置は、ブロー成形後、図１に示すブロー成形容器１においては、底部４における、口部２の中心軸線Ｃ２上に位置することとなる。   Here, when the flat blow molded container 1 as described above is to be formed by biaxial stretch blow molding by air blow using pressurized air as in the prior art, the preform 10 is placed radially outward. When extending toward the cavity, the portion where the distance to the cavity is small becomes thick because the stretch amount is small, while the portion where the distance to the cavity is large is stretched greatly and the thickness becomes thin, so that the thin portion In some cases, it was difficult to manufacture because breakage or perforation may occur. On the other hand, when the pressurized liquid (gas) is supplied into the preform 10 instead of the pressurized air (gas) as in this embodiment, the heat transfer coefficient of the liquid is higher than that of the gas. Therefore, the cooling efficiency at the time of blow molding is increased, and the temperature decrease of the preform 10 is accelerated. The pressurized liquid to be supplied is set to a temperature lower than that of the heated preform 10. The temperature of the pressurized liquid may be adjusted in advance using a temperature adjusting device, or may be managed at room temperature. Also, as the preform 10 is stretched and the thickness is reduced, the temperature is likely to decrease. When the temperature is decreased, the resin is difficult to be stretched. Therefore, in the process of blow molding, the thick and high temperature portion is preferential. Thus, the wall thickness is appropriately distributed. As a result, it is possible to mold with an appropriate thickness when a pressurized liquid is used compared to when pressurized air is used. In the preform 10 shown in FIG. 3, the gate position located at the lower end 14 of the main body 11 on the central axis C3 is the same as that at the bottom 4 in the blow molded container 1 shown in FIG. , It is located on the central axis C2 of the mouth part 2.

上記のような作用により、本実施形態のブロー成形容器１のように、胴部３が扁平形状、且つ、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心しているブロー成形容器１を、加圧した液体を用いた２軸延伸ブロー成形により成形することで、特殊な形状のプリフォームや特殊な加熱方法を用いることなく、適切な肉厚の容器を容易に製造することが可能となる。   Due to the above action, as in the blow-molded container 1 of the present embodiment, the body 3 is flat and the center axis C1 of the body 3 is eccentric with respect to the center axis C2 of the mouth 2. By forming the molded container 1 by biaxial stretch blow molding using a pressurized liquid, a container having an appropriate thickness can be easily manufactured without using a special-shaped preform or a special heating method. It becomes possible.

ここで、本実施形態では、胴部３が扁平形状、且つ、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心している形状としたが、胴部３が扁平形状でなく、口部２の中心軸線Ｃ２に対して胴部３の中心軸線Ｃ１が偏心している形状、及び、口部２の中心軸線Ｃ２と、胴部３の中心軸線Ｃ１が同一直線上であり胴部３が扁平形状の容器においても、本発明の効果を得ることができる。   Here, in the present embodiment, the trunk portion 3 has a flat shape, and the central axis C1 of the trunk portion 3 is eccentric with respect to the central axis C2 of the mouth portion 2. However, the trunk portion 3 has a flat shape. The center axis C1 of the body 3 is eccentric with respect to the center axis C2 of the mouth 2, and the center axis C2 of the mouth 2 and the center axis C1 of the body 3 are on the same straight line. The effect of the present invention can be obtained even in a container having a flat portion 3.

なお、本実施形態のブロー成形容器１を成形するにあたっては、プリフォーム内に供給する液体として、洗剤、飲料、化粧品、薬品等の最終的に製品として壜体に充填される内容液を使用することが好ましく、これにより、壜体への内容液の充填工程を省略して、その生産工程やブロー成形装置の構成を簡略化することができる。   In forming the blow-molded container 1 of the present embodiment, as the liquid supplied into the preform, the content liquid that is finally filled in the casing as a product such as detergent, beverage, cosmetics, and medicine is used. Preferably, this eliminates the step of filling the casing with the content liquid, thereby simplifying the production process and the configuration of the blow molding apparatus.

また、本実施形態においては、ブロー成形容器１の製造方法として、２軸延伸ブロー成形を用いることを前提として説明したものの、加圧した液体を用いたダイレクトブロー成形に応用することも可能である。具体的には、チューブ状に押出したパリソンを金型で挟み、底部を閉塞して有底筒状としたパリソンの内部に、加圧した液体を供給してブロー成形してパリソンを延伸させ、金型のキャビティに沿った形状に成形する。   In the present embodiment, the method for manufacturing the blow molded container 1 has been described on the assumption that biaxial stretch blow molding is used, but it can also be applied to direct blow molding using a pressurized liquid. . Specifically, the parison extruded into a tube shape is sandwiched between molds, the bottom is closed and the bottom of the parison is made into a cylindrical shape, and a pressurized liquid is supplied and blow molded to stretch the parison, Mold into a shape along the mold cavity.

１ ブロー成形容器
２ 口部
３ 胴部
４ 底部
５ 外ねじ部
６ ネックリング
７ 小径部
８ 主要部
１０ プリフォーム
１１ 本体部
１２ プリフォームの口部
１３ プリフォームのネックリング
Ｃ１ 胴部の中心軸線
Ｃ２ 口部の中心軸線
Ｃ３ プリフォームの中心軸線 DESCRIPTION OF SYMBOLS 1 Blow molding container 2 Mouth part 3 Body part 4 Bottom part 5 External thread part 6 Neck ring 7 Small diameter part 8 Main part 10 Preform 11 Body part 12 Preform mouth part 13 Preform neck ring C1 Center axis C2 trunk part Center axis of mouth C3 Center axis of preform

Claims (2)

有底筒状のプリフォームをブロー成形用の金型に装着した後、加圧した液体を該プリフォームの内部に供給して、該金型のキャビティに沿った形状に成形する２軸延伸ブロー成形により製造されたブロー成形容器であって、
筒状の口部と、該口部に連なる中空の胴部と、該胴部の下端開口部を閉塞する底部と、を備え、
前記胴部は該胴部の中心軸線に垂直な断面において扁平形状である、又は、前記口部の中心軸線に対して該胴部の中心軸線が偏心している、ブロー成形容器。 A biaxial stretch blow in which a bottomed cylindrical preform is mounted on a blow mold and then a pressurized liquid is supplied into the preform to form a shape along the cavity of the mold. A blow molded container manufactured by molding,
A cylindrical mouth part, a hollow body part connected to the mouth part, and a bottom part closing the lower end opening of the body part,
The blow-molded container, wherein the barrel is flat in a cross section perpendicular to the central axis of the barrel, or the central axis of the barrel is eccentric with respect to the central axis of the mouth. 有底筒状のプリフォームをブロー成形用の金型に装着した後、加圧した液体を該プリフォームの内部に供給して、該金型のキャビティに沿った形状に成形する２軸延伸ブロー成形により製造されたブロー成形容器であって、
筒状の口部と、該口部に連なる中空の胴部と、該胴部の下端開口部を閉塞する底部と、を備え、
前記胴部は該胴部の中心軸線に垂直な断面において扁平形状であり、且つ、前記口部の中心軸線に対して該胴部の中心軸線が偏心している、ブロー成形容器。 A biaxial stretch blow in which a bottomed cylindrical preform is mounted on a blow mold and then a pressurized liquid is supplied into the preform to form a shape along the cavity of the mold. A blow molded container manufactured by molding,
A cylindrical mouth part, a hollow body part connected to the mouth part, and a bottom part closing the lower end opening of the body part,
The blow-molded container, wherein the barrel is flat in a cross section perpendicular to the central axis of the barrel, and the central axis of the barrel is eccentric with respect to the central axis of the mouth.
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