JP2002059913A - Pet bottle container having means for supporting change in internal pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PET bottle container wherein a change in pressure inside the PET bottle container can be absorbed only by performing slight processing to the container to support the change in internal pressure without large deformation of the container, and wherein the container can sufficiently stand a drop impact and is inexpensive. SOLUTION: The PET bottle container 1 is manufactured by extrusion-blow- molding a parison made of a polyethylene terephthalate(PET) comprising a barrel 6 with an approximately circular cross section and a base 2 equipped with a grounded portion 5. A flat plane 13 surrounded by a handle 9 with an approximately triangular cross section or a reinforcing rib groove 16 is provided on the PET bottle container wherein the handle 9 or the plane 13 deforms according to a pressure, thereby allowing a change in internal pressure to be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PET bottle container manufactured by blow molding a hollow parison made of polyethylene terephthalate (hereinafter referred to as "PET") in an openable and closable mold. In particular, the present invention relates to a handle having a novel shape.

[0002]

2. Description of the Related Art In a PET bottle container, a hollow parison made of polyethylene terephthalate, which is a thermoplastic synthetic resin, is heated in a mold, extruded and blow molded, and at the same time, the parison is cut by a cutter provided in the mold. It is manufactured by cutting and joining the cut portions. Since such PET bottle containers can be produced at high efficiency and at low cost, mainly for beverages such as juices,
Widely used as containers for medicines, cosmetics and other substances.

[0003]

Conventionally, this type of PET bottle container is placed in a closed state by means of a cap or the like in order to protect the contents after filling the inside thereof with a product or the like. Since it is stored and moved in this state, there is a high possibility that the pressure inside the PET bottle container will change due to external changes such as temperature during storage, changes in the volume of the internal filling itself, or impacts such as falling. . If the internal pressure change is large, the change in pressure cannot be absorbed, and the PET bottle container is likely to be deformed.

In other words, in order to solve the above-mentioned problem, it is necessary to provide a mechanism for adjusting the change in the internal pressure in the PET bottle container. It is difficult, and even if it is possible to cope with a complicated shape, it must be accompanied by deformation of the entire surface of the cylindrical body. It was not something.

[0005] The present invention has been made in view of such problems of the conventional product, and by improving the shape of the handle of the PET bottle, the above-mentioned problem can be solved without a large deformation of the cylindrical body. An object is to provide an inexpensive PET bottle container that can respond to changes in internal pressure.

[0006]

Means for Solving the Problems The first invention of the present application is:
In order to solve the problem, in a PET bottle container having a cylindrical body portion and a bottom portion provided with a grounding portion, and when manufactured by extrusion blow molding, a bite joint portion is formed at the bottom portion, The inside was in communication with the container, and a handle whose horizontal cross section was substantially triangular in shape and each side of the triangle was arcuate was connected to the cylindrical body.

[0007] A second invention of the present application is an extrusion blow molding method having a cylindrical body portion and a bottom portion provided with a ground portion, wherein a cutout joint portion is formed in the bottom portion during molding. In the PET bottle container to be provided, a reinforcing rib groove having a flat surface formed therein is installed on the upper part of the cylindrical body,
Further, the flat surface portion surrounded by the reinforcing rib groove was reinforced by a reinforcing rib groove formed in the longitudinal direction inside the flat surface portion.

[Cylindrical Body] In the present invention, the cylindrical body is the main body of the PET bottle container and has a shape converging toward the upper mouth. Further, it is preferable to provide reinforcing ribs around the periphery in order to increase the strength.

[Grounding part] In the present invention, the grounding part is made of PET.
It is a portion that protrudes from the bottom of the bottle container and forms a concave portion at the center of the bottom. For example, an annular shape, a polygonal shape, and a square shape can be implemented. Of these, an annular one is preferred from the viewpoint of processing and the stability of the PET bottle container.

[Communication with the interior] In the present invention, the phrase "the interior of the handle is in communication with the container" means that the handle is connected to the container body so that the inside of the handle and the cylindrical body which is the main body of the PET bottle are continuous with each other. It is connected to the part.

As described above, the cross section of the handle in the horizontal direction has a substantially triangular shape, each side of which has an arc shape, and can be deformed inward or outward of the triangle, respectively. Has become.

Further, according to the present invention, a preferable internal pressure absorbing effect can be obtained by the above-mentioned substantially triangular cross section of the handle.
That is, it is mechanically stable and allows a large change in the cross-sectional area.

When the cross-section triangle has a handle structure having an apex on the inner side, the formability and ease of holding can be improved, and it can be said that this is a preferable shape.

The flat surface portion surrounded by the reinforcing rib groove according to the second invention of the present application is located at the upper portion of the container body, and the inside of the flat surface portion is reinforced by the reinforcing rib groove formed in the longitudinal direction. The flat surface portion can be easily deformed inside or outside the container body. In addition, the flat surface portion may be provided at one place, but may be provided at two or more places according to the purpose.

As described above, in a PET bottle container manufactured by an extrusion blow molding method, having a cylindrical body and a bottom provided with a grounding portion, and having a cutout joint formed in the bottom at the time of molding, A handle is provided on the upper part of the cylindrical body, and the handle is required to have an interior communicating with the container, and to have a horizontal cross section of the handle having a substantially triangular shape in which each side has an arc shape. In the first invention of the present application to the upper part of the cylindrical body,
A reinforcing rib groove having a flat surface portion formed therein is provided, and the second invention of the present application, which requires that a reinforcing rib groove formed in the longitudinal direction inside the flat surface portion be provided, may be combined as necessary. it can.

In addition, P produced by extrusion blow molding
In the ET bottle container, a thick cut joint is formed at the bottom at the time of molding. For this reason, it has a structure in which the bite joint is grounded. However, the bite joints are vulnerable to impact, reducing the drop impact strength of the PET bottle container. Particularly with a bottle having a simple shape, it may be difficult to improve the drop impact strength.

In addition, at the time of biting during extrusion blow molding, the bottom portion is liable to become extremely thin on the side orthogonal to the biting joint, and the drop impact causes cracks to occur in the thin portion, and the like. It is conceivable to further reduce the strength.

In such a case, the drop impact strength can be improved by the following method.

[Position Separated from Ground Contact] The cut joint is arranged at a position separated from the ground so that the drop impact does not directly affect the cut joint. It is preferable that a concave portion is provided at the center of the bottom portion, and a recessed portion is formed in the ground portion along the cutout joint portion, so that the cutout joint portion is arranged at a position separated from the ground surface of the ground portion.

[The bellows portion] It is preferable that the lower portion of the body is formed as a bellows portion. This bellows portion provides a cushioning property to the lower part of the body of the PET bottle container. In order to form the bellows portion in the body portion, a wavy peripheral groove is provided, but this peripheral groove may be provided in a single groove, but it is preferable to provide two or more peripheral grooves because cushioning property is increased.

[Oval Bottom] Also, it is preferable that the bottom has an elliptical shape whose major axis is the direction along the cut-out joint and whose minor axis is the direction perpendicular to the cut-out joint. This oval bottom prevents the bottom of the PET bottle container from being thinned during extrusion blow molding, thereby preventing the bottom from being cracked by a drop impact.

[0022]

The PET bottle container according to the first invention of the present application is
(Hereinafter referred to as a bottle container), since it has a substantially triangular handle having a deformable cross-sectional shape as described above, even if the internal pressure of the bottle container changes, the handle portion deforms and absorbs this internal pressure change. To serve as an internal pressure change absorbing device.

That is, when the internal pressure of the bottle changes, the inside of the handle communicates with the container body when the bottle internal pressure changes, so that the change in the internal pressure of the container body is naturally transmitted to the handle. At this time, each side of the cross-section polygon of the handle portion is deformed inward or outward in accordance with the pressure, and absorbs the pressure change inside the bottle. As described above, since the handle portion is deformed and absorbs pressure, it is possible to suppress a change in shape of the container body.

In the second invention of the present application, a reinforcing rib groove having a flat surface formed therein is provided in an upper portion of the cylindrical body, and the inside of the flat surface is formed in a longitudinal direction. The flat surface portion reinforced by the reinforcing rib groove is such that when a pressure change occurs inside the bottle container, the flat surface portion is easily deformed inward or outward of the container body in accordance with the change in pressure. , It is possible to adjust the internal pressure.

Further, by setting the bite joint formed on the bottom part at the time of extrusion blow molding at a position separated from the grounding surface of the grounding part to the inside of the trunk, even if the bottle container falls to the ground, The drop impact is not directly transmitted to the bite joint which is the most vulnerable to impact.

Furthermore, when the lower part of the body part adjacent to the bottom part is formed as a bellows part, the impact of the drop applied to the bottle container is reduced by the elasticity of the bellows part. Therefore, the adverse effect on the bite joint is further alleviated.

When the bottom is formed into an elliptical shape having a major axis in a direction along the cut-out joint and a short axis in a direction perpendicular to the cut-out joint, it is possible to prevent the bottom from becoming thin during extrusion blow processing. Thus, when the bottle container is dropped, no crack is generated on the bottom surface.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) An embodiment will be described with reference to FIGS. FIG. 1 is a side view of the embodiment, and FIG.
FIG. 3 is a front view of the bottom of the embodiment, FIG. 3 is a view taken in the direction of the arrow III in FIG. 1, and shows a side surface of the bottom, and FIG. 4 is a side view of the top of the embodiment viewed from the IV direction in FIG. 5 is a sectional view taken along line VV in FIG.

An annular grounding portion 5 is provided on the bottom 2 of the bottle container 1 so as to surround a concave portion 4 formed at the center. The body 6 is a main body of the bottle container, has a shape converging toward the upper mouth 12, and has a plurality of reinforcing rib grooves 11 provided therearound. 14a is a circular reinforcing portion formed near the mouth 12. Then, at the time of extrusion blow molding, a linear cut-off joint 3 which is cut off by a parison cutter (not shown) and simultaneously bonded is formed on the bottom 2.

A handle 9 is provided on the upper part of the bottle container 1. As can be seen from FIGS. 4 and 5, the handle 9 is connected to the upper part of the body 6, the inside of the handle 9 communicates with the bottle container at 9a and 9b, and the handle 9 has a deformable substantially triangular cross section. . The triangular cross section of this handle 9 is
7, 17, 17 are arc-shaped, and have a knot shape in which each side 17 is connected by an arc. When an internal pressure is applied to the handle 9, the connection shape of the sides 17, 17, 17 is deformed to approach a circle, and conversely, when a negative pressure is applied, the connection shape of the sides 17, 17, 17 is pulled inward. It acts as an internal pressure adjusting device. With the handle, the bottle container can respond to a change in internal pressure caused by expansion or contraction of the contents due to a change in temperature, or a change in internal pressure when the bottle container falls. When the handle has a cross-sectional shape that is substantially triangular in cross section with the inside being a vertex, moldability and ease of holding are improved.

A flat surface portion 13 extending in the longitudinal direction surrounded by a reinforcing rib groove 16 is provided near the mouth portion 12 on the upper portion of the body portion 6.
Are formed in two places. When a pressure change occurs inside the bottle container, the flat surface portion 13 can be easily deformed to adjust the internal pressure. The flat surface portion 13 is reinforced by reinforcing rib grooves 15 formed in the flat surface portion 13 in the longitudinal direction. Here, when an internal pressure is applied to the container main body portion, the container main body portion is deformed outward, and conversely, when a negative pressure is applied, the container main body portion is drawn inward and dented, thereby adjusting the internal pressure. In this manner, the flat end 13 can adjust the internal pressure in response to a change in the internal pressure of the bottle container. The number of the flat surface portions 13 is not limited to two, but may be one, or three or more.

Further, the bite joint 3 is formed as shown in FIG.
As shown in FIG. 3 which is a view taken from the arrow of FIG. 3, the depression 10 is formed from the contact surface 5 a of the contact portion 5 to the inside of the body 6 along the cut joint 3 extending toward the center O of the bottom 2. By forming, the bite joint 3 is arranged at a position separated from the ground plane 5a by a distance L toward the inside of the body 6. With such a configuration, it is possible to prevent the drop impact from being directly transmitted to the bite joint 3. Therefore, the drop impact strength of the bottle container 1 can be improved.

Further, the body 6 on the bottom 2 side of the bottle container 1
The lower part is provided with a continuous two-stage corrugated circumferential groove 7 to form a three-stage bellows portion 8. The bottle container 1 is provided with elasticity by a bellows portion 8. Therefore, bottle container 1
Is dropped, the drop impact is further reduced by the elasticity of the bellows portion, and the drop impact to the bite joint 3 is further reduced. Note that the more the number of the bellows sections 8 is, the more effective the effect is.

As shown in FIG. 2, the bottom 2 of the bottle container 1 has a major axis A in the direction along the cut joint 3 and a short axis B in a direction perpendicular to the joint 3. It is formed in an elliptical shape. With this configuration, when the parison is extruded and blow-molded, the parison is cut off by a cutter (not shown), and when the parison is joined at the same time, the direction orthogonal to the cutout joint portion 3 is prevented from becoming extremely thin, and the bottom portion 2 is caused by a drop impact. The generation of cracks is prevented.

[0036]

According to the present invention, there is provided a bottle container having an approximately cylindrical cross section and a bottom provided with a grounding portion, and manufactured by extrusion blow molding using PET as a material. A handle is provided at the top of the body of the container, the handle is internally connected to the container, the cross-section is substantially triangular, and the cross-sectional direction of each side is an arc shape, so that the contents are It can respond to changes in internal pressure due to changes in volume and the like. As a result, it was possible to improve the ability of the bottle container to respond to changes in the internal pressure while having a simple bottle shape. In addition, since the shape is simple, processing is easy and a bottle container having an internal pressure adjusting function can be obtained.

Further, a reinforcing rib groove having a flat surface formed therein is provided on an upper portion of the cylindrical body, and the inside of the flat surface is reinforced by a reinforcing rib groove formed in a longitudinal direction. Due to the flat portion, the internal pressure adjusting function can be improved.

The thick ground joint formed at the bottom at the time of extrusion blow molding is provided with a concave portion at the center of the bottom and a depressed portion along the ground joint at the ground portion. The drop impact is not transmitted directly to the bite joint 3 with low drop impact strength because it is located at a position away from the inside of the body to the inside of the body, and as a result, the drop impact of the bottle container is improved. I was able to. In addition, since it has a simple shape, it is easy to process, and it is possible to obtain a bottle container which is inexpensive and has high drop impact strength.

Further, when the lower part of the body of the bottle container having the above structure is formed as a bellows portion, the drop impact is reduced, and the drop impact resistance of the bottle container is further improved. When the bottom of the bottle container is formed in an elliptical shape in which the direction along the cutout joint 3 is the long axis A and the direction perpendicular to the cutout joint 3 is the short axis B, at the time of extrusion blow processing, The bottom portion was prevented from being thinned, and there was no risk of the bottom portion being cracked due to a drop impact when the bottle container fell, and the drop impact strength of the bottle container was further improved.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a front view of the bottom of FIG. 2;

FIG. 3 is a side view of an upper portion of the embodiment as viewed from a direction III in FIG. 1;

FIG. 4 is a side view of the upper part of the second embodiment viewed from the direction IV in FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PET bottle container 2 Bottom part 3 Biting joint part 5 Grounding part 5a Grounding surface 6 Body 8 Bellows part 9 Handle 9a Handle connection part 9b Handle connection part 13 Flat surface part 16 Reinforcement rib groove 17 Arc-shaped side

Claims (7)

[Claims] 1. A PET bottle container manufactured by an extrusion blow molding method, having a cylindrical body and a bottom provided with a grounding portion, wherein a cutout joint is formed in the bottom at the time of molding. A handle is provided on the upper part of the cylindrical body, and the inside of the handle communicates with the container, the cross section of the handle is substantially triangular, and the cross-sectional direction of each side is an arc shape. A PET bottle container, characterized in that: 2. The PET bottle container according to claim 1, wherein the substantially triangular cross section of the handle is a triangle having an apex in a body inward direction. 3. The PET bottle container according to claim 1, wherein the handles are connected in a longitudinal direction. 4. A PET bottle container manufactured by an extrusion blow molding method, having a cylindrical body and a bottom provided with a grounding portion, and having a cutout joint formed in the bottom at the time of molding. A reinforcing rib groove having a flat surface formed therein is provided at an upper portion of the cylindrical body, and the inside of the flat surface is reinforced by a reinforcing rib groove formed in a longitudinal direction. Bottle container. 5. A method according to claim 1, wherein a concave portion is provided at the center of said bottom portion, and a recessed portion is formed in said ground contact portion along said cut-off joint portion, whereby said cut-off joint portion is disposed at a position separated from the ground contact surface to the inside of the trunk. The PET bottle container according to any one of claims 1 to 4, wherein: 6. The PET according to claim 1, wherein a lower portion of the trunk portion adjacent to the bottom portion is formed as a bellows portion.
Bottle container. 7. The elliptical shape according to claim 1, wherein the bottom has a major axis in a direction along the cut joint and a short axis in a direction perpendicular to the cut joint. PET bottle container.