Biaxially stretching blow molded container

Abstract

To provide a biaxially stretching blow molded container which has a handle part having a shape which is easy to grip.SOLUTION: A synthetic resin biaxially stretching blow molded container 1 is formed by biaxially stretching blow-molding a bottomed cylindrical preform 60. The biaxially stretching blow molded container 1 includes: a cylindrical mouth part 10; an upper side trunk part 20 having a shape which is integrally connected to a lower end of the mouth part 10 and in which a second wall 22 on the other side projects farther outward in the radial direction than a first wall 21 on one side by sandwiching an axis line O of the mouth part 10; a lower side trunk part 30 which is integrally connected to a lower end of the upper side trunk part 20 and in which the lower end is closed by a bottom part 40; and a cylindrical handle part 50 which is integrally connected to the first wall 21, which extends obliquely downward from a connection portion 51 with the first wall 21, and in which the lower end is closed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a biaxially stretch blow molded container made of synthetic resin, which is formed by biaxially stretch blow molding a bottomed cylindrical preform. [Background technology]

[0002] For example, biaxially stretched blow molded containers made of synthetic resin, such as polyethylene terephthalate (PET) bottles, which are formed by biaxially stretching and blow molding a bottomed cylindrical preform, are lightweight and easy to handle, have excellent storage stability for the contents, and are inexpensive, so they are used for a variety of purposes such as for beverages, food, and cosmetics.

[0003] Conventionally, such biaxially stretch blow molded containers include large-capacity (e.g., 4 liters) containers, such as those used to store shochu as the content liquid, that have a handle integrally formed with the body so that the container can be held by hand (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-119038 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the conventional biaxially stretched blow molded containers described above have a pair of vertically elongated recesses facing each other formed in both side wall portions of the body portion, and these recesses and the back wall portion form a handle portion, which is a so-called pinch grip type, and therefore has the problem that the handle portion is difficult to grip.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a biaxially stretch blow molded container having a handle portion that is easily gripped. [Means for solving the problem]

[0007] The biaxially stretched blow molded container of the present invention is a biaxially stretched blow molded container made of a synthetic resin, formed by biaxially stretching blow molding a cylindrical preform with a bottom, and is characterized by having a cylindrical mouth portion, an upper body portion that is integrally connected to the lower end of the mouth portion and has a shape in which a second wall on one side of the axis of the mouth portion protrudes more radially outward than a first wall on the other side, a lower body portion that is integrally connected to the lower end of the upper body portion and has a lower end closed by a bottom portion, and a tubular handle portion that is integrally connected to the first wall, extends diagonally downward from the connection portion with the first wall and has a closed lower end.

[0008] In the biaxially stretch blow molded container of the present invention having the above configuration, it is preferable that the first wall is disposed radially outward from the outer circumferential surface of the mouth portion, the first wall being disposed radially outward from the axis.

[0009] In the biaxially stretch blow molded container of the present invention having the above configuration, it is preferable that the lower body portion has an inclined wall that is integrally connected to the lower end of the first wall, faces the handle portion, and extends obliquely downward. Effect of the Invention

[0010] According to the present invention, it is possible to provide a biaxially stretch blow molded container having a handle portion with an easy-to-grip shape. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a biaxially stretch blow molded container according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of the biaxially stretch blow molded container shown in FIG. [Diagram 3] FIG. 2 is a side view of the biaxially stretch blow molded container shown in FIG. [Figure 4] FIG. 2 is a plan view of the biaxially stretch blow molded container shown in FIG. [Diagram 5] FIG. 2 is a bottom view of the biaxially stretched blow molded container shown in FIG. [Figure 6] 1 is a half cross-sectional view of a preform used in a method for producing a biaxially stretch blow molded container according to one embodiment of the present invention. [Figure 7] FIG. 2 is an explanatory diagram for explaining a procedure for biaxially stretch-blow molding a preform using a mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will now be described in more detail with reference to the drawings.

[0013] 1 to 5, a biaxially stretch blow molded container 1 according to one embodiment of the present invention is made of synthetic resin and formed by biaxially stretch blow molding a bottomed cylindrical preform. The biaxially stretch blow molded container 1 has a relatively large capacity (e.g., 4 liters) and can be used to store, for example, shochu as a liquid content in its internal space.

[0014] The biaxially stretched blow molded container 1 can be made of, for example, polyethylene terephthalate (PET), but may also be made of other synthetic resins.

[0015] The biaxially stretch blow molded container 1 has a mouth portion 10, an upper body portion 20, a lower body portion 30, a bottom portion 40, and a handle portion 50, and has an overall bottle shape.

[0016] Here, in this specification and the claims, the vertical direction means the vertical direction when the biaxially stretched blow molded container 1 is in an upright position as shown in Figure 2, and the radial direction means the direction passing through the axis O of the mouth portion 10 and perpendicular to the axis O.

[0017] The mouth portion 10 is cylindrical with its center on the axis O, and has a male thread 11 formed integrally on its outer circumferential surface for mounting a closing member such as a cap. In addition, a neck ring 12 is formed integrally below the male thread 11 of the mouth portion 10.

[0018] The mouth portion 10 may be configured to have a protrusion that engages a closing member such as a cap by undercut engagement when the closing member is plugged, instead of the male thread 11. Also, the mouth portion 10 may be configured without the neck ring 12.

[0019] The upper body 20 is integrally connected to the lower end of the mouth 10, and has a shape in which a second wall 22 on one side of the axis O of the mouth 10 protrudes more radially outward than a first wall 21 on the other side. The upper body 20 constitutes a part of the internal space of the biaxially stretch blow molded container 1.

[0020] More specifically, the upper body 20 includes a first wall 21 on one side of the axis O of the mouth 10, a second wall 22 on the other side, and a pair of third walls 23 connected to the first wall 21 and the second wall 22. The first wall 21, the second wall 22, and the pair of third walls 23 are flat walls substantially parallel to the axis O, and are arranged to form a substantially rectangular shape in the plan view shown in FIG. 4. The first wall 21 is arranged radially outward from the outer circumferential surface of the mouth 10, centered on the axis O. The distance from the axis O to the first wall 21 is shorter than the distance from the axis O to the second wall 22. As a result, the portion of the upper body 20 where the first wall 21, the second wall 22, and the third wall 23 are provided is a square tube having a center at a position shifted from the axis O. The upper portions of the second wall 22 and the pair of third walls 23 of the upper body portion 20 form a roughly dome-shaped shoulder portion 24 that curves upward so as to gradually reduce in diameter, and the upper end of the shoulder portion 24 of the upper body portion 20 is integrally connected to the lower end of the mouth portion 10.

[0021] The lower body portion 30 is integrally connected to the lower end of the upper body portion 20, and its lower end is closed by a bottom portion 40. The lower body portion 30, together with the upper body portion 20, constitutes a part of the internal space of the biaxially stretch blow molded container 1.

[0022] More specifically, the lower body 30 has a first wall 31 substantially parallel to the first wall 21 of the upper body 20, a second wall 32 substantially parallel to the second wall 22 of the upper body 20, and a pair of third walls 33 substantially parallel to the pair of third walls 23 of the upper body 20. The first wall 31, the second wall 32, and the third wall 33 are arranged side by side in the circumferential direction with the same radial distance from the axis O. As a result, the portion of the lower body 30 where the first wall 31, the second wall 32, and the third wall 33 are provided has a rectangular tube shape centered on the axis O. The first wall 31 of the lower body 30 is arranged radially outward of the first wall 21 of the upper body 20, and the lower body 30 has an inclined wall 34 between the first wall 21 and the first wall 31. The inclined wall 34 is integrally connected to the first wall 21 at its upper end and is integrally connected to the first wall 31 at its lower end, and is inclined so as to gradually protrude radially outward from the upper end to the lower end.

[0023] The bottom portion 40 has a rectangular plate shape and is integrally connected to the lower end of the lower body portion 30 to close the lower end of the lower body portion 30.

[0024] The handle portion 50 is a portion that is gripped by the user's hand.

[0025] The handle portion 50 is integrally connected to the first wall 21 of the upper body portion 20, extends obliquely downward from a connecting portion 51 with the first wall 21, and is tubular with a closed lower end. The handle portion 50 communicates with the inside of the upper body portion 20, i.e., the internal space of the biaxially stretch blow molded container 1, at the connecting portion 51 with the first wall 21, and constitutes part of the internal space of the biaxially stretch blow molded container 1 together with the upper body portion 20 and the lower body portion 30.

[0026] In this embodiment, the handle portion 50 has a base portion 52 extending downward from the connecting portion 51 over a predetermined range, and a grip portion 53 which is integrally connected to the lower end of the base portion 52 .

[0027] The base portion 52 has a pair of side walls 52a that face each other at a distance narrower than the distance between the pair of third walls 23 and that slope so that the distance between them gradually narrows radially outward, and the upper surface 52b is connected to the shoulder-shaped portion 24 and has a curved shape similar to that of the shoulder-shaped portion 24.

[0028] The gripping portion 53 has a pair of side walls 53a that are integrally connected to the corresponding side walls 52a of the base portion 52 and that are inclined so that the distance between them gradually narrows from the side of the base portion 52 toward the lower end. On the other hand, the upper surface 53b of the gripping portion 53 is a flat wall inclined with respect to the axis O, and is integrally connected to the upper surface 52b of the base portion 52 via a step portion 53c that protrudes radially outward.

[0029] The lower surface 54 of the handle portion 50 is in the form of a flat plate extending from the base portion 52 to the grip portion 53, and is inclined with respect to the axis O at a larger angle than the inclined wall 34 of the lower body portion 30 and the upper surface 53b of the grip portion 53. A gap 55 extending obliquely from above to below is provided between the inclined wall 34 of the lower body portion 30 and the lower surface 54 of the handle portion 50. The gap 55 is large enough to allow a user to grip the handle portion 50 with his or her hand.

[0030] The cross-sectional area of ​​grip portion 53 is smaller than the cross-sectional area of ​​base portion 52, making it easier to grip in the hand.

[0031] As described above, in the biaxially stretch blow molded container 1 of this embodiment, the handle portion 50 to be gripped by a user during use is integrally connected to the first wall 21 of the upper body portion 20, extends obliquely downward from the connecting portion 51 with the first wall 21, and has a cylindrical configuration with a closed lower end, so that the handle portion 50 can be easily gripped by a user. Therefore, by gripping the handle portion 50 with the hands, a user can securely hold and handle the biaxially stretch blow molded container 1 in their hands, even if the biaxially stretch blow molded container 1 is a large-capacity container with a large content volume.

[0032] Furthermore, in the biaxially stretched blow molded container 1 of this embodiment, the handle portion 50 is integrally formed and connected to the first wall 21 of the upper body portion 20, which protrudes less radially outward relative to the axis O of the mouth portion 10 than the second wall 22. Therefore, the handle portion 50 can be positioned closer to the axis O, making it easier to hold the biaxially stretched blow molded container 1 more securely in the hand.

[0033] Furthermore, in the biaxially stretched blow molded container 1 of this embodiment, the lower body portion 30 is integrally connected to the lower end of the first wall 21 of the upper body portion 20, faces the handle portion 50, and has an inclined wall 34 that extends diagonally downward. Therefore, when the handle portion 50 is held by hand, the lower body portion 30 is prevented from interfering with the hand, making the handle portion 50 easier to grip.

[0034] Furthermore, in the biaxially stretch blow molded container 1 of this embodiment, the handle portion 50 is shaped so that the cross-sectional area of ​​the base portion 52 is larger than that of the gripping portion 53, so that the strength of the handle portion 50 is increased by the base portion 52, while the gripping portion 53 can be shaped to be easy to hold by hand. As a result, even if the biaxially stretch blow molded container 1 has a large capacity and has a large internal volume, it is possible to prevent the handle portion 50 from being deformed or damaged when the biaxially stretch blow molded container 1 is handled by gripping the handle portion 50.

[0035] In addition, since the handle portion 50 constitutes part of the internal space of the biaxially stretched blow molded container 1, the inside of the handle portion 50 is also filled with the liquid contents. However, when the handle portion 50 is held in the hand and the liquid contents are poured out from the mouth portion 10, the liquid contents inside the handle portion 50 are preferentially poured out from the mouth portion 10, so that the liquid contents do not remain inside the handle portion 50.

[0036] The biaxially stretch blow molded container 1 of this embodiment is a blow molded product formed by biaxially stretch blow molding a bottomed cylindrical preform 60 shown in FIG.

[0037] In this embodiment, the preform 60 is an injection molded product of a synthetic resin material, and has a mouth portion 61. The mouth portion 61 is a portion that is not stretched in the biaxial stretch blow molding, and has the same shape as the mouth portion 10 of the biaxial stretch blow molded container 1. That is, the mouth portion 61 is cylindrical with the axis O as its center, and a male thread 62 and a neck ring 63 are integrally provided on its outer circumferential surface. A body portion 64 is integrally provided and connected to the lower end of the mouth portion 61. The body portion 64 is cylindrical with approximately the same diameter as the mouth portion 61, and its lower end is closed by a hemispherical bottom portion 65. Thus, the preform 60 has an approximately test tube shape as a whole.

[0038] Next, a method for producing a biaxially stretch blow molded container according to one embodiment of the present invention will be described, in which a biaxially stretch blow molded container 1 is produced using a preform 60 shown in FIG.

[0039] First, as shown in Fig. 7, a preform 60 is placed in a blow molding die 70. The die 70 is a split die made by combining a first die half 71 and a second die half 72, and has a cavity 70a shaped to correspond to the external shape of the biaxially stretch blow molded container 1, with a core 73 placed inside the cavity 70a. The core 73 has a shape that corresponds to the gap 55 between the inclined wall 34 of the lower body portion 30 of the biaxially stretch blow molded container 1 and the lower surface 54 of the handle portion 50.

[0040] Next, a pressurized medium is supplied into the preform 60 placed in the mold 70, and the preform 60 is biaxially stretched and blow molded while forming the handle portion 50 between the inner surface of the mold 70 and the core 73. That is, by placing the core 73 inside the cavity 70a of the mold 70, the biaxially stretched and blow molded container 1 having the handle portion 50 of a predetermined shape is biaxially stretched and blow molded inside the mold 70. At this time, the core 73 is placed slightly radially outward with respect to the outer circumferential surface of the body portion 64 of the preform 60, so that the first wall 21 of the upper body portion 20 is placed radially outward of the mouth portion 10, which has approximately the same diameter as the body portion 64.

[0041] When the biaxially stretch blow molding of the preform 60 is completed, the core 73 is then pulled out obliquely downward from the mold 70. That is, the core 73 is pulled out from inside the mold 70 along the gap 55 between the inclined wall 34 of the lower body portion 30 of the biaxially stretch blow molded container 1 and the lower surface 54 of the handle portion 50. Next, the first mold half 71 and the second mold half 72 are separated to open the mold 70, and the completed biaxially stretch blow molded container 1 is removed from the mold 70.

[0042] In this way, according to the manufacturing method of the biaxially stretch blow molded container of this embodiment, the preform 60 is biaxially stretch blow molded using the mold 70 equipped with the core 73, thereby making it possible to easily manufacture the biaxially stretch blow molded container 1 having the above-mentioned configuration.

[0043] Furthermore, in the biaxially stretch blow molded container 1 manufactured by the manufacturing method for a biaxially stretch blow molded container according to this embodiment, the handle portion 50 is formed into a cylindrical shape by stretching a part of the body portion 64 of the preform 60, so that when a blow molded container is formed by extrusion blow molding, the handle portion 50 can be made stronger than when the handle portion is formed by cutting off the mold. Therefore, damage to the handle portion 50 due to dropping, etc. can be suppressed.

[0044] Furthermore, in the biaxially stretch blow molded container 1 manufactured by the manufacturing method for a biaxially stretch blow molded container according to this embodiment, the stretch ratio in the radially outward direction of the preform 60 in the portion of the first wall 21 of the upper body 20 where the handle portion 50 is provided is smaller than the stretch ratio in the radially outward direction of the preform 60 in the second wall 22, so that the thickness of the first wall 21 is thicker than the thickness of the second wall 22. This increases the strength of the first wall 21 of the upper body 20 where the handle portion 50 is provided, and makes it possible to reliably hold and handle the biaxially stretch blow molded container 1 by hand even if the biaxially stretch blow molded container 1 is a large-capacity container with a large content volume.

[0045] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0046] For example, in the above embodiment, the biaxially stretch blow molded container 1 is a large-capacity container for storing shochu, but the purpose and capacity can be changed in various ways.

[0047] In addition, in the above embodiment, the handle portion 50 has a shape having a base portion 52 and a gripping portion 53, but this is not limited to this, and the shape can be modified in various ways as long as it has a cylindrical shape extending diagonally downward from the connecting portion 51 with the first wall 21 and has a closed lower end.

[0048] Furthermore, in the above embodiment, the upper body portion 20 and the lower body portion 30 are each configured so that their main parts are rectangular tubular, but this is not limited thereto, and the main parts may be configured to have other shapes, such as a cylindrical shape.

[0049] Furthermore, in the above embodiment, as shown in FIG. 7 , the preform 60 is biaxially stretch blow molded with the core 73 placed in the mold 70 to produce the biaxially stretch blow molded container 1, but other manufacturing methods may be used, such as biaxially stretch blow molding the preform 60 with the core 73 not placed in the mold 70, and then inserting the core 73 into the mold 70 to form the handle portion 50. [Explanation of symbols]

[0050] 1. Biaxially stretched blow molded containers 10 Mouth 11 Male thread 12 Neck Ring 20 Upper body 21 1st wall 22 Second wall 23 Third wall 24 Shoulder 30 Lower body 31 1st wall 32 Second wall 33 Third wall 34 Slanted wall 40 bottom 50 Handle 51 Connecting part 52 Base 52a side wall 52b Top side 53 Gripping part 53a side wall 53b Top side 53c Step 54 Bottom side 55 Gap 60 Preforms 61 Mouth 62 Male thread 63 Neck Ring 64 Torso 65 Bottom 70 Mold 70a cavity 71 First mold piece 72 Second mold piece 73 Core O axis

Claims

1. A biaxially stretch-blow molded container made of synthetic resin, which is formed by biaxially stretch-blow molding a bottomed cylindrical preform, A cylindrical mouth portion; an upper body portion that is integrally connected to a lower end of the mouth portion and has a shape in which a second wall on one side of an axis of the mouth portion is greater than a first wall on the other side of the axis of the mouth portion and protrudes radially outward; A lower body portion that is integrally connected to a lower end of the upper body portion and has a lower end closed by a bottom portion; a cylindrical handle portion that is integrally connected to the first wall, extends obliquely downward from the connecting portion with the first wall, and has a closed lower end.

2. The biaxially stretch blow molded container according to claim 1 , wherein the first wall is disposed radially outward from an outer circumferential surface of the mouth portion in a radial direction centered on the axis.

3. 3. The biaxially stretch blow molded container according to claim 1, wherein the lower body portion has an inclined wall that is integrally connected to a lower end of the first wall, faces the handle portion, and extends obliquely downward.

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