JP3490701B2 - PET bottle container with means for responding to changes in internal pressure - Google Patents

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 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 for extrusion blow molding, and at the same time, the parison is cut by a cutter provided in the mold. It is manufactured by cutting the bite and joining the bite parts. Since such PET bottle containers can be produced at high efficiency and at low cost, mainly for beverages such as juice,
Widely used as a container for medicines, cosmetics and other substances.

[0003]

Conventionally, a PET bottle container of this type is placed in a sealed state by means of a cap or the like in order to protect the contents after the product or the like is filled inside. Since it is stored and moved in this state, it is highly likely 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 dropping. . If this internal pressure change is large, the change in pressure cannot be absorbed, and the PET bottle container is likely to be deformed.

That is, in order to solve the above problems, it is necessary to provide the PET bottle container with a mechanism for adjusting the change in internal pressure, but it is not possible to cope with such a change in pressure with a simple shape. It is difficult, and even if it is possible to deal with it with a complicated shape, it is disadvantageous in manufacturing, transportation, etc. because the entire surface of the cylindrical body must be deformed, and the appearance is also excellent. It wasn't something.

The present invention has been made in view of the above problems of the conventional products, and by improving the shape of the handle of the PET bottle, a large deformation of the tubular body portion is not generated, and the above-mentioned problems are solved. It is an object of the present invention to provide an inexpensive PET bottle container that can cope with changes in internal pressure.

[0006]

Means for Solving the Problems In order to solve the above problems, the invention of the present application has a tubular body portion and a bottom portion provided with a grounding portion, and when manufactured by extrusion blow molding, in PET bottle container is formed at the junction outright bite is a bottom, interior in communication with the container, a horizontal cross-sectional shape substantially triangular, each side of the triangle is arcuate this
Being able to deform inward or outward in a triangular shape
I attached the handle to the tubular body.

Further , in a PET bottle container manufactured by an extrusion blow molding method, which has a tubular body portion and a bottom portion provided with a grounding portion, and in which the bottom portion is formed with a cut-out joint portion, On the upper part of the tubular body, a reinforcing rib groove having a flat surface portion formed therein is installed, and further, by a reinforcing rib groove formed in the longitudinal direction inside the flat surface portion,
Reinforcing Then good the flat surface portion surrounded by the reinforcing rib groove
Good

[Cylindrical Body] In the present invention, the tubular body is the main body of the PET bottle container and has a shape that converges toward the upper mouth. In addition, it is preferable to provide reinforcing ribs around the periphery because it is necessary to have strength.

[Grounding Part] In the present invention, the grounding part is made of PET.
It is a portion that projects from the bottom of the bottle container and forms a recess in the center of the bottom, and for example, an annular shape, a polygonal shape, or a square shape can be implemented. Among them, the annular one is preferable from the viewpoint of processing and the stability of the PET bottle container.

[Communication with Inside] In the present invention, that the inside of the handle communicates with the container means that the inside of the handle is the main body of the PET bottle and the inside of the handle is continuous with the container body. It is connected to the part.

[Cross-sectional shape of handle] As described above, the horizontal cross-section of the handle has a substantially triangular shape, and each side thereof has an arc shape and can be deformed inward or outward of the triangle. Has become.

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

Further, if the triangular section has a handle structure having the inner side as the apex, it is possible to improve the formability and the ease of holding, and it can be said that it is a preferable shape.

The flat surface portion surrounded by the reinforcing rib groove is located in 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. It said flat surface portion is made possible to easily deform inwardly or outwardly the container body. Further, the flat surface portion may be provided at one place, but it may be provided at two or more places depending on the purpose.

A PET bottle container manufactured by an extrusion blow molding method, which has a tubular body portion and a bottom portion provided with a grounding portion, and in which the bite joint portion is formed at the time of molding, A handle is provided on the upper part of the body of the book, the inside of which is in communication with the container, and the horizontal cross section of the handle is required to have a substantially triangular shape with each side arcuate. In the invention of the application, a reinforcing rib groove having a flat surface portion formed therein may be provided on an upper portion of the tubular body portion, and a reinforcing rib groove formed in a longitudinal direction inside the flat surface portion may be provided.

Further, P produced by extrusion blow molding
The ET bottle container has a thick cut-and-joint formed at the bottom during molding. Therefore, it has a structure in which the cut-out joint portion is grounded. However, the cut-and-joint is weak against impact, which reduces the drop impact strength of the PET bottle container. In particular, it may be difficult to improve drop impact strength with a bottle having a simple shape.

In addition, at the time of biting during extrusion blow molding, the bottom portion is likely to be extremely thin on the side orthogonal to the biting joint, and the drop impact may cause cracks in this thin portion. It is also possible to further reduce the strength.

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

[Position Separated from Grounding Part] The biting joint is arranged at a position separated from the grounding part so that a drop impact does not directly affect the biting joint. It is preferable to dispose the biting joint at a position separated from the grounding surface of the grounding portion by providing a recess in the center of the bottom portion and a depression along the grounding joining portion in the grounding portion.

[Bellow portion] Further, it is preferable to form the lower portion of the body portion as a bellows portion. This bellows portion provides cushioning to the lower portion of the body of the PET bottle container. A corrugated peripheral groove is provided to form the bellows portion in the body portion, but the peripheral groove may have one line, but it is preferable to provide two or more lines because the cushioning property becomes large.

[Bottom of Ellipse] Further, it is preferable that the bottom has an elliptical shape having a major axis in the direction along the cut joint and a minor axis in the direction orthogonal to the cut joint. By preventing the bottom portion of the PET bottle container from being thinned at the time of extrusion blow molding, the oval bottom portion can prevent the bottom portion from cracking due to 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 handle having a substantially triangular shape 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. Plays a role as an internal pressure change absorbing device.

That is, in the handle portion, when the internal pressure of the bottle changes, the inside of the handle communicates with the container body portion, so that the change in the internal pressure of the container body portion is naturally transmitted to the handle portion. At this time, each side of the polygonal cross section of the handle portion is adjusted to the pressure and deformed inward or outward to absorb the pressure change inside the bottle. Since the handle portion is deformed and absorbs the pressure in this way, it is possible to suppress the shape change of the container main body portion.

Further, a reinforcing rib groove having a flat surface portion formed therein is provided on an upper portion of the tubular body portion, and the inside of the flat surface portion is reinforced by a reinforcing rib groove formed in a longitudinal direction. The flat surface portion, when a pressure change occurs inside the bottle container, the flat surface portion can be easily deformed inward or outward of the container body portion according to the change in pressure, and the internal pressure can be adjusted. is there.

Further, even if the bottle container is dropped onto the ground, the bite joint formed on the bottom portion at the time of extrusion blow molding is located at a position separated from the ground contact surface of the ground contact portion to the inside of the body. The drop impact is not transmitted directly to the cut joint, which is the most resistant to impact.

Further, when the lower portion of the body portion adjacent to the bottom portion is formed as a bellows portion, the elasticity of the bellows portion reduces the drop impact applied to the bottle container. Therefore, the adverse effect exerted on the bite joint is further alleviated.

Further, if the direction along the bottom cut-out joint is a major axis and the direction orthogonal to the bottom cut-out is a short axis, the bottom is prevented from becoming thin during extrusion blow processing. Therefore, when the bottle container is dropped, the bottom surface is not cracked.

[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. 1 to 5. FIG. 1 is a side view of the embodiment, and FIG.
3 is a front view of the bottom of FIG. 3, FIG. 3 is a view taken in the direction of arrow III in FIG. 1, showing the side of the bottom, and FIG. 4 is a side view of the upper part of the embodiment as seen from the direction IV of FIG. 5 is a sectional view taken along the line VV of FIG.

A ring-shaped grounding portion 5 is provided on the bottom portion 2 of the bottle container 1 so as to surround a concave portion 4 formed in the center. The body portion 6 is a main body portion of the bottle container, has a shape that converges toward the upper mouth portion 12, and is provided with a plurality of reinforcing rib grooves 11 on the periphery. Further, 14a is a circular reinforcing portion formed near the mouth portion 12. Then, during extrusion blow molding, a linear bite-cut joint 3 is formed on the bottom portion 2 and is cut by a parison cutter (not shown) and joined at the same time.

A handle 9 is provided on the top of the bottle container 1. As can be seen from FIGS. 4 and 5, the handle 9 is connected to the upper portion of the body 6, the inside of the handle 9 communicates with a 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 has 1 side
7, 17, 17 are arcuate shapes, and each side 17 has a knot shape in which they are connected by an arc. When internal pressure is applied to the handle 9, the connecting shape of each side 17, 17, 17 is deformed so as to approximate a circle, and conversely, when a negative pressure is applied, the connecting shape of each side 17, 17, 17 is pulled inward. Being able to be used, it plays a role as an internal pressure adjusting device. By the handle, the bottle container can cope with a change in the internal pressure when the contents expand or contract due to a temperature change and the internal pressure changes, or when the bottle container falls. When the handle has a cross-sectional shape with a substantially triangular cross-section with the inner side as the apex, the moldability and the ease of holding are improved.

A flat surface portion 13 surrounded by the reinforcing rib groove 16 and extending in the longitudinal direction is formed in the vicinity of the mouth portion 12 on the upper portion of the body portion 6.
Are formed at two locations. 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 a reinforcing rib groove 15 formed in the flat surface portion 13 in the longitudinal direction. Here, when an internal pressure is applied to the container body portion, the container body portion is deformed outward, and when the container body portion is in a negative pressure state, the container body portion is pulled inward and recessed to adjust the internal pressure. Thus, the flat end portion 13 can adjust the internal pressure in response to the change in the internal pressure of the bottle container. The flat surface portion 13 is not limited to two places, but may be one place or three or more places.

Further, the bite-off joint portion 3 is shown by III in FIG.
As shown in FIG. 3 which is an arrow view of FIG. 3, the depression 10 is formed from the grounding surface 5 a of the grounding portion 5 to the inside of the body 6 along the bite-out joint 3 extending toward the center O of the bottom 2. By forming it, the bite-off joint part 3 is arranged at a position spaced inwardly of the body part 6 by the distance L from the contact surface 5a. With such a configuration, it is possible to prevent the drop impact from being directly transmitted to the cut-out joint portion 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
In the lower part of the, a continuous corrugated groove 7 having two stages is provided to form a three-stage bellows portion 8. Elasticity is imparted to the bottle container 1 by the bellows portion 8. Therefore, the bottle container 1
Even when the object is dropped, the impact of the drop is further alleviated by the elasticity of the bellows portion, and the impact of the drop on the bite joint 3 is further alleviated. The greater the number of steps of the bellows portion 8 is, the more effective it is.

As shown in FIG. 2, in the bottom portion 2 of the bottle container 1, the direction along the bite joint 3 is the major axis A, and the direction orthogonal to the bite joint 3 is the minor axis B. It is formed in an elliptical shape. With this configuration, when the parison is extruded and blow-molded, it is prevented from being cut by a cutter (not shown), and at the same time, the direction orthogonal to the cut-and-joint 3 is prevented from becoming extremely thin, and the bottom 2 is prevented from falling due to impact. It prevents the occurrence of cracks.

[0036]

INDUSTRIAL APPLICABILITY The present invention is a bottle container which has a body portion having a substantially cylindrical cross section and a bottom portion provided with a grounding portion and which is manufactured by extrusion blow molding using PET as a material, and has a cylindrical shape. of the body portion of the handle has et provided above, the handle is cross-section
Has a substantially triangular shape and the inside is connected to the container.
Each side of the substantially triangular shape of is an arc shape and the inside of the substantially triangular shape
Or, it can be deformed outward.
Therefore, it is possible to cope with changes in internal pressure due to changes in the volume of the contents. As a result, it was possible to improve the ability to respond to changes in the internal pressure of the bottle container, despite the simple bottle shape. Further, since it has a simple shape, it is easy to process and a bottle container having an internal pressure adjusting function can be obtained.

Further, a reinforcing rib groove having a flat surface portion formed therein is provided on an upper portion of the tubular body portion, and the inside of the flat surface portion is reinforced by a reinforcing rib groove formed in a longitudinal direction. The flat portion makes it possible to improve the internal pressure adjusting function.

Further, by providing a thick bite-cut joint formed at the bottom during extrusion blow molding, a recess is provided in the center of the bottom, and a depression along the bite-joint is formed at the ground contacting portion, whereby the ground contact is achieved. Since it is arranged at a position separated from the inside of the body to the inside of the body, the drop impact is not directly transmitted to the bite joint 3 having a low drop impact strength, and as a result, the drop impact of the bottle container is improved. I was able to do it. Further, since it has a simple shape, it is easy to process, and it is possible to obtain a cheap bottle container having a high drop impact strength.

Further, when the lower part of the body of the bottle container having the above-mentioned structure is formed as the bellows part, the drop impact is alleviated and the drop impact strength of the bottle container is further improved. Then, when the bottom portion of the bottle container is formed into an elliptical shape with the major axis A extending in the direction along the bite joint 3 and the minor axis B extending in the direction orthogonal to the bite joint 3, when the extrusion blow process is performed, The bottom portion was prevented from becoming thin, and when the bottle container dropped, there was no risk of receiving a drop impact and cracks at the bottom portion, and the drop impact strength of the bottle container was further improved.

[Brief description of drawings]

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

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

FIG. 3 is a side view of the upper portion of the embodiment as seen from the direction III in FIG.

FIG. 4 is a side view of the upper part of the second embodiment as seen from the IV direction in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

[Explanation of symbols]

1 PET bottle container 2 bottom 3 bite joint 5 ground 5a Ground plane 6 torso 8 bellows 9 handle 9a Handle connecting part 9b Handle connecting part 13 Flat surface 16 Reinforcing rib groove 17 arc sides

Continuation of the front page (56) Reference JP-A-6-99965 (JP, A) JP-A-61-21333 (JP, A) JP-A-62-52032 (JP, A) JP-A-62-52033 (JP , A) Actual flat 4-121213 (JP, U) Actual flat 4-132018 (JP, U) Actual flat 5-40115 (JP, U) Actual flat 5-75113 (JP, U) Actual flat 6-35132 (JP, U) Actually opened 55-108012 (JP, U) Actually opened 63-144432 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 1/02 B65D 1/40 B65D 23/10

Claims (7)

(57) [Claims] 1. A PET bottle container manufactured by an extrusion blow molding method, which has a tubular body portion and a bottom portion provided with a grounding portion, and in which the bottom portion is formed with a bite joint portion, which is manufactured by an extrusion blow molding method. On the upper part of the tubular body, the cross section is substantially triangular and
The part communicates with the container, and each side of this triangular shape is an arc.
A handle that is in the shape of a triangle and deforms inward or outward
A PET bottle container characterized by being provided . 2. The PET bottle container according to claim 1, wherein the cross-section substantially triangular shape of the handle is a triangle having an apex in the inner direction of the body. 3. The PET bottle container according to claim 1, wherein the handles are connected in the longitudinal direction. 4. A reinforcing rib groove having a flat surface portion formed therein is provided on an upper portion of the tubular body, and the inside of the flat surface portion is reinforced by a reinforcing rib groove formed in a longitudinal direction. In any one of Claim 1 thru | or 3 characterized by the above-mentioned.
The PET bottle container described . 5. A recess is provided in the center of the bottom portion, and a depression along the cut-off joint is provided in the ground contact portion,
The PET bottle container according to any one of claims 1 to 4, wherein the bite-off joint portion is arranged at a position separated from the ground contact surface toward the inside of the body portion. 6. PET bottle container according to any one of claims 1 to 5 were molded bottom of the barrel portion adjacent to said bottom as bellows portion. Wherein said bottom portion is a direction along the joint-away eating a long axis, any one of claims 1 to 6 and a direction perpendicular to the bite-away joint has a oval and minor axis PET bottle container described in.