JP2002284134A - Synthetic resin container and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container which can be folded, has pressure resistance, and can prevent its body from swelling. SOLUTION: In this flexible and foldable synthetic resin container 10 molded by blow molding, reinforcement members 20 prepared in advance are disposed at predetermined positions of a die 30 to be blow molded with a parison 31, and the reinforcement members 20 are compound at predetermined positions of the container 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin container and a method for manufacturing the same, and more particularly to a foldable synthetic resin container and a method for manufacturing the same.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open Publication No. 7-37909, for example, a synthetic resin container which can be bent by forming a rib at a predetermined position while forming a flexible material is used. Proposed. Such containers are widely used for filling various liquids. And since it can be folded at the time of disposal, it is effective in reducing the volume of garbage.

[0003]

A conventional synthetic resin container which is foldable in order to reduce the volume at the time of disposal,
Generally, the resin itself is made thin and flexible. For this reason, it is inferior to conventional hard bottles in terms of pressure resistance and blistering. In order to eliminate such disadvantages, a thicker material or a harder material is used. If such measures are taken, folding becomes difficult and the volume reduction is impaired. This tendency is particularly remarkable when a large container is used.

[0004] That is, a volume reduction bottle that is folded at the time of disposal to reduce the volume is made foldable at the time of disposal by reducing the thickness of the bottle and making it softer. Although such a foldable container can reduce the amount of dust, the strength of the bottle itself is weak, and particularly the pressure resistance is weak. In addition, when an internal pressure is applied, a body blistering phenomenon occurs in which the body part is deformed so as to protrude to the outer peripheral side, and the design of the appearance is impaired.

[0005] In the case of a large volume reduction bottle, particularly a container of a type having a capacity of 10 to 20 l, such a container itself cannot be stacked, and stacking on a pallet is limited. . Further, such a reduced volume bottle has a problem that storage and transportation efficiency is remarkably inferior to a metal can or a hard bottle for filling a liquid. In order to solve such a problem, it is necessary to increase the thickness of the bottle itself or to increase the hardness thereof, and the volume reduction effect is impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to provide a synthetic resin container which is foldable, has a required strength, and can be stacked in many layers. It is intended to provide a manufacturing method.

[0007]

SUMMARY OF THE INVENTION The main invention relating to a synthetic resin container is to provide a foldable synthetic resin container.
The present invention relates to a synthetic resin container characterized in that a reinforcing member is compounded at a predetermined position on an outer peripheral portion. Here, a bent portion is provided at a predetermined position of the reinforcing member, and it is preferable that the reinforcing member can be bent inward at the bent portion. It is also preferable that a bent line composed of a groove is formed at a predetermined position of the container body. Further, it is preferable that engaging portions are provided on the upper and lower portions of the reinforcing member, respectively, so that when the reinforcing members are stacked up and down, they are engaged with each other and positioned.

The invention relating to a manufacturing method is a method of manufacturing a synthetic resin container, wherein the reinforcing member is compounded at a predetermined portion by forming the reinforcing member at a predetermined portion of a mold. It is about.

[0009]

FIG. 1 shows a synthetic resin container according to an embodiment of the present invention. This container made of synthetic resin is made of a composite material of low-density polyethylene and high-density polyethylene, and the amount of low-density polyethylene is relatively large to make it a flexible container. The container 10 is a substantially rectangular parallelepiped container, and constitutes a packaging container for filling a liquid. That is, a cylindrical opening 11 for filling a liquid therein or discharging the liquid therein is provided on the upper surface.
Are formed. A cap 13 is screwed into the mouth 11. Further, the container is provided with a handle 14 on its upper part. The cylindrical mouth 11 and the handle 14 are located in the concave portion 15 on the upper surface, and the cap 1 when the cap 13 is screwed into the cylindrical mouth 11 is attached.
The upper surface of the handle 3 and the upper surface of the handle 14 substantially coincide with or slightly lower than the upper surface of the container.

Such a synthetic resin container is provided with reinforcing members 20 extending in the vertical direction at four corners on the outer peripheral side. The reinforcing member 20 is made of a composite material of low-density polyethylene and high-density polyethylene, and has a relatively large amount of high-density polyethylene to have higher rigidity than the container body. These reinforcing members 20 are provided with bent portions 21 each consisting of a hinge portion at predetermined positions above and below the reinforcing members 20, and can be bent inward by these bent portions 21. An engaging projection 25 is formed on the upper surface side of the reinforcing member 20, and the reinforcing member 20
Is formed with an engagement recess 26 on the lower surface thereof. The engagement recess 26 has an open bottom surface to receive the engagement projection 25 of another container. Therefore, when the containers are stacked in multiple levels, the engaging projections 25 and the engaging recesses 26 engage with each other and are positioned by this.

FIGS. 2 and 3 show such a reinforcing member 20.
This shows a method for manufacturing a synthetic resin container 10 in which a pair of molds 3 are divided into front and rear parts.
0 is used. Then, synthetic resin reinforcing members 20 formed in advance by another method are arranged at the four corners of the cavity of the mold 30. In such a state, the cylindrical parison 31 is inserted into the mold 30.
Then, the container 10 is formed by being blown and molded.

At this time, the parison 31 expands and the mold 3
And the reinforcing member 20 is disposed at the corner portion of the cavity of the container 10.
The four corners are combined as shown in FIG. The mold 10 is formed with a projection 32 projecting into the cavity at a predetermined position on the upper part of the mold 10. A handle 14 whose part is closed is formed. Therefore, the handle 14 is formed by removing the closed portion.

As shown in FIG. 4, the reinforcing member 20 combined with the container 10 is formed with an engaging projection 25 and an engaging concave portion 26 on the upper and lower sides, respectively. Each of the bent portions 21 is formed. A notch 24 is formed on the side surface of the reinforcing member 20 at a position corresponding to the bent portion 21. Also, as shown in FIG. 5, claws 22 protruding inward are formed at the ends of the upper and lower flat portions of the reinforcing member 10, and the container 10 is formed so as to cover the claws 22 when the parison 31 is blow-molded. Be compounded. Therefore, the reinforcing member 20 can be connected to the container 10 using such claws 22.

As shown in FIG. 6, a rib 23 is formed on the inside of the reinforcing member 20 so as to extend in the height direction, and is joined to the reinforcing member 20 so as to surround the rib 23 when the container 10 is formed. You may. In particular, as shown in FIG. 6B, a rib 23 having an inverted T-shaped cross section is formed on the inner surface side of the reinforcing member 20, and such a rib 23 is wrapped in a part of the container 10 to form a reinforcement. The member 20 is the container 1
It is firmly bound to zero.

Further, as shown in FIG. 7, the reinforcing member 20 has a bent portion 21 formed of a hinge portion.
The bent portion 21 is constituted by a V-groove formed so as to open toward the inside of the container. Accordingly, such a hinge portion 21 cannot be folded outward as shown in FIG. 7A, but can be folded inward as shown in FIG. 7B. That is, even if the reinforcing member 20 is provided, such a container 10 does not become unfoldable.

In correspondence with the above-described bending structure of the reinforcing member 20, the container body 10 has a front and a rear side corresponding to the bent portion 21 of the reinforcing member 20, as shown in FIG. A bending line 27 is formed. The bending line 27 is formed by a concave groove. Further, a bent line 28 extending in the vertical direction is formed substantially at the center in the width direction on the side surface of the container, and the upper and lower portions of the bent line 28 correspond to the bent line 27. Each part is branched in a V-shape to form a bending line 29. These bending lines 27 to 29 are formed by forming ridges 34 at predetermined positions in the cavity of the mold 30 as shown in FIG.

FIGS. 8 and 9 show a state where the reinforcing member 20 is bent using the hinge portion 21 and the bending lines 27 to 29 of the container. That is, a pair of reinforcing members 20 on the front side of the four reinforcing members 20 are connected to each other as shown in FIG.
As shown in FIG. 9, the container 21 is folded so as to be folded inward at the hinge portions 21, and the main surface of the body of the container is folded inward by the upper and lower folding lines 27, and finally, as shown in FIG. 9. This container 10
Are folded so that the top surface and the bottom surface respectively overlap. In FIGS. 8 and 9, the side of the container is folded inward, but the container may be folded with the side out. Therefore, from this, the volume of the container is reduced. In particular, as shown in FIG.
When the container 1 is closed with the cap 13, air cannot enter the container, and the container is kept in a folded state due to negative pressure.

As described above, the synthetic resin container according to the present embodiment has a rigid reinforcing member having a large thickness at the four corners at the time of molding the container 10 and made of the same material as the container 10 or another material. 20 and the mold 3 as shown in FIGS.
0 and simultaneously molded and bonded or pseudo-bonded. It is also possible to attach the reinforcing member 20 after molding the container. With such a reinforcing member 20, it becomes possible to obtain the pressure resistance required for the container 10. Further, the present invention prevents the blister from bulging to the outer peripheral side when the internal pressure is applied, and enables stacking, which is a problem particularly with large volume reduction bottles.

The reinforcing member 20 can be injection-molded or extruded from the same material as the container 10. Other hard materials can also be used. Bonding can be achieved by the parison 31 melted during the molding of the container 10 penetrating or penetrating a part of the reinforcing member 20. If the reinforcing member 20 and the container 10 are made of the same material, they are bonded at the time of molding. It should be noted that fitting and bonding at the time of molding can also be used.

By disposing the thick reinforcing member 20 in this manner, the strength against pressure in the vertical direction is increased, the self-sustainability is improved, and the body bulge expands so that the body part protrudes outward. Is prevented. Except for the portion reinforced by the reinforcing member 20, the container 10 can be kept as thin and soft as possible to maintain the foldability as a reduced volume bottle. Further, when such containers are stacked in many stages, the reinforcing member 20 mainly supports the load. The same applies to loading on a pallet carried by a forklift.

The thickness and shape of the reinforcing member 20 can be appropriately changed to a thickness and a shape that can withstand the number of stacks.
Further, it may be formed into a shape that is easily adhered during molding. Further, by forming the engaging projection 25 and the engaging concave portion 26 on the upper and lower sides of the reinforcing member 20, respectively, the containers can be positioned relative to each other when the containers are stacked in many stages, and the stability can be obtained. In addition, by forming a part of the reinforcing member 20 as a thin portion such as the hinge portion 21, it is allowed to bend inward at the time of folding. In the illustrated embodiment, the position where the reinforcing member 20 is combined is at four corners, but it is not necessarily required to be at such four corners, and the reinforcing member is combined with other parts. You may do so. In particular, in order to prevent blistering, it is preferable to combine a plate-shaped reinforcing member with a wide area of the trunk.

[0022]

The main invention relating to the synthetic resin container is as follows.
In a foldable synthetic resin container, a reinforcing member is compounded at a predetermined position on an outer peripheral portion.

Therefore, it is possible to provide the folding type container with a required strength, particularly a pressure resistance, by using such a composite member, and it is possible to stack the containers or prevent the bulging phenomenon.

The invention relating to the manufacturing method relates to a method in which the reinforcing member is compounded at a predetermined portion by forming the reinforcing member at a predetermined portion of a mold.

Therefore, according to such a manufacturing method, the reinforcing member can be easily combined with the folding type container.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a synthetic resin container according to an embodiment.

FIG. 2 is a front view showing an internal structure of one of the opened molds, and is a view taken along line BB in FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an external perspective view of a reinforcing member.

FIG. 5 is an enlarged sectional view of a main part showing a composite structure of the reinforcing member and the container.

6A and 6B are an external perspective view and a main part enlarged cross-sectional view showing a composite structure of a container and a reinforcing member using ribs.

FIG. 7 is an enlarged sectional view of a main part showing a structure of a bent portion of a reinforcing member.

FIG. 8 is an external perspective view showing a state in which the container is being folded.

FIG. 9 is an external perspective view of the completely folded state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Container 11 Mouth part 12 Screw 13 Cap 14 Handle 15 Concave part 20 Reinforcement member 21 Bent part (hinge part) 22 Claw 23 Rib 24 Notch 25 Engagement projection 26 Engagement concave part 27-29 Bent line (concave groove) 30 Mold 31 parison 32 protrusion 34 protrusion

Claims (5)

[Claims] 1. A container made of a foldable synthetic resin, wherein a reinforcing member is compounded at a predetermined position on an outer peripheral portion. 2. The synthetic resin container according to claim 1, wherein a bent portion is provided at a predetermined position of the reinforcing member, and is bent inward at the bent portion. 3. The synthetic resin container according to claim 1, wherein a bent line composed of a groove is formed at a predetermined position of the container body. 4. The synthetic resin container according to claim 1, wherein an engaging portion is provided on each of an upper portion and a lower portion of the reinforcing member, and the engaging portions are positioned when they are stacked vertically. . 5. A method of manufacturing a synthetic resin container, wherein the reinforcing member is compounded at a predetermined portion by forming the reinforcing member at a predetermined portion of a molding die.