JPS6229375Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a bottle that is assembled into a vertically rectangular box made of cardboard with only the upper end portion of the mouth tube protruding. The object of the present invention is to obtain a biaxially stretched blow-molded bottle made of polyethylene terephthalate resin that has excellent resistance to contents.

[Conventional technology]

There is a liquid storage container in which a bag-like container body made of a sheet and having a spout is housed in a vertically rectangular box made of cardboard, with only the spout of the bag-like container protruding from inside the box.

This type of container self-maintains its shape due to the rigidity of the box, and seals the liquid due to the liquid-tightness of the container body. For reasons such as ease of dispensing, the spout of the container protrudes diagonally upward from a portion cut diagonally from one end of the upper end of the box, and extends outward from an imaginary extension of the side and top surfaces of the box. It has been taken into consideration that it will not be located in a protruding position.

Conventionally, the container body used for this type of container has been molded from a laminated film mainly made of polyethylene resin film, which has excellent content resistance.
The problem was that the odor of polyethylene resin was precipitated in the liquid.

In particular, when the liquid content contains alcohol, such as sake, the precipitation of odor from the polyethylene resin increases over time, which is a serious drawback as it can even change the taste of the liquid content. was.

By the way, as is well known, bottles made of polyethylene terephthalate resin (hereinafter simply referred to as PET) are
It is known that this PET bottle has extremely excellent content resistance with no odor precipitation from the content liquid, but in order for this PET bottle to effectively demonstrate its excellent content resistance, it is necessary for this bottle to It is required to be biaxially stretched.

Therefore, if a biaxially stretched blow-molded bottle made of PET, which has been sufficiently stretched to have a wall thickness as thin as that of a sheet, is used instead of the laminated film container made of the polyethylene resin sheet, it is possible to reduce the precipitation of odors. This means that an extremely good container can be obtained.

However, as mentioned above, the spout of the container assembled inside the box needs to be located far away from the central axis of the box and be in an inclined position, whereas the PET biaxially stretched blow-molded bottle Due to the molding method and to obtain more uniform stretching, the spout, which is the spout, must be located on the central axis of the body, making it impossible to assemble it into a box.

In this respect, conventionally, as shown in Japanese Utility Model Application Publication No. 150763/1983, a bellows part is formed around the entire circumference of the neck part, and by expanding and contracting this bellows part, the mouth part can be freely tilted. There are containers that can be used for this purpose, and it is conceivable to incorporate such conventional technology. However, the disadvantage of this conventional container with a bellows is that in order for the bellows part to freely expand and contract, it must be made considerably thinner than the body. There was a major problem in that the mechanical strength of the entire circumference of the formed neck was weakened, and the bellows part could expand and contract freely, making the mouth barrel unstable.

[Problem that the invention attempts to solve]

The present invention was devised to eliminate the drawbacks and problems of the conventional examples described above, and it is possible to perform biaxial stretch blow molding with a sufficient amount of stretching, and to expand the mouth part without weakening its mechanical strength. PET that can be assembled into the box in a stable state
The technical problem is to provide a resin bottle.

[Means for solving problems]

Therefore, the bottle 1 according to the present invention is made of PET that is biaxially stretched and blow-molded until the wall becomes sufficiently thin, especially the shoulder 4 and the area from the shoulder 4 to the body 2. It is a bottle body, and, like a normal bottle body, has a structure in which a barrel part 3 forming a spout is connected to the upper end of a body part 2 in the shape of a cylinder with a bottom, via a shoulder part 4. .

Between the body part 2 and the shoulder part 4 except for the rear side of the bottle body 1, there is a bellows-shaped wall whose valley lines and ridge lines are inclined toward the boundary between the body part 2 and the shoulder part 4 on the rear side. A structured bellows-like portion 5 is molded.

As is clear from FIG. 2 showing the side surface, the height and width of the bellows-shaped portion 5 gradually decreases as it approaches the rear side of the bottle 1.

Therefore, the valley lines and ridge lines of the bellows-like portion 5 are inclined upward toward the rear side of the bottle 1.

The lower end of the bellows-like portion 5 is located inward of the bottle 1 to a greater extent than the upper end of the body 2, and the lower end of the bellows-like portion 5 and the upper end of the body 2 are connected to the bellows-like portion 5. They are connected by a tapered portion 6 having a tapered wall structure that slopes upward as it approaches.

As a matter of course, the width of this tapered portion 6 is as follows.
It decreases toward the rear of the bottle 1.

Furthermore, the shoulder portion 4 has a spherical arc shell wall structure that bulges upward.

In this way, since the bellows upper part 5 is molded between the body part 2 and the shoulder part 4 except for the rear side of the bottle body 1, the molded part of the bellows-like part 5 is not connected to other parts. Compared to this, the wall structure has severe irregularities, and because of this, the front side and both sides of the bottle 1 where the bellows-shaped part 5 is formed in the portion from the body 2 to the shoulder 4 of the bottle 1 are located at the rear of the bottle 1. The bottle body 1 is subjected to greater stretching than the side portions during molding, and as a result, the portion of the bottle body 1 near the bellows-shaped portion 5 becomes thinner and easily deforms when bent.

[Effect]

Since the present invention has the above-described configuration, when a downward force is applied diagonally downward to the left on the mouth tube part 3 from the state shown in FIG. Since the shoulder portion 4 and the tapered portion are invertedly curved and self-maintained in this invertedly curved deformed posture, the mouth tube portion 3 is held in a forwardly inclined posture.

At this time, the tilting displacement of the mouth barrel part 3 is caused by a rotational displacement centered on the boundary between the body part 2 and the shoulder part 4 on the rear side of the bottle body 1, and an inverted curved deformation of the shoulder part 4 and the tapered part 6. Due to the accompanying displacement in which the front and rear widths of the shoulder portion 4 and the tapered portion 6 are substantially reduced, the shoulder portion 4 of the bottle body 1 is
The area from the bottle 1 to the body 2 is pulled forward, and the boundary between the shoulder 4 and the body 2 on the rear side of the bottle 1 is also displaced forward, as shown in Fig. 3. As a result, the forward tilting displacement of the mouth barrel portion 3 becomes larger.

As described above, the bottle body 1 according to the present invention can be in a state where the mouth barrel part 3 is tilted forward by the reverse curved deformation of the shoulder part 4 and the tapered part 6, but in many cases , the mouth tube part 3 shown in FIG.
The degree of self-retained inclination is slightly insufficient to assemble the bottle 1 into the box 7 and position the mouth barrel 3 to protrude outside the box 7 through the ejection opening 8.

In this case, simply by applying a slight downward force to the mouth portion 3 which is in an inclined position, the bellows-shaped portion 5 easily elastically deforms, so that alignment of the mouth portion 3 with the nozzle 8 after the bottle body 1 is assembled inside the box 7 can be easily achieved.

〔Example〕

In the case of the illustrated embodiment, a flange is provided around the outer periphery of the lower end of the mouth barrel portion 3, and this flange is used to attach the deformed bottle 1 to the box 7, as shown in FIG.
When assembled and stored inside the box 7 and the mouth tube 3 is positioned to protrude outside the box 7 from the protrusion opening 8 of the box 7, the amount of protrusion of the mouth tube 3 is restricted and the mouth tube 3 tends to become unstable. It functions to stably position the bottle 1 relative to the box 7 using the protrusion 8, thereby making the assembled state of the bottle 1 to the box 7 more stable.

Also, the mouth barrel part 3 is formed to have a large height, but this is done in order to obtain a larger amount of protrusion from the inside of the box 7, and by using this mouth barrel part 3, the box 9 and the bottle body 1 can be connected to each other. This is to obtain space for assembling a suitable jig to achieve the mechanical connection.

Note that the injection and filling of the content liquid into the bottle 1 is performed in the second step.
It is advantageous in terms of workability to carry out the inversion curve deformation in the state shown in the figure before the inversion curve deformation, but if the inversion curve deformation is carried out from the state shown in FIG. 2 to the state shown in FIG. 3, the internal volume of the bottle 1 will decrease. Therefore, there is a possibility that the reverse curved deformation may be reversed and returned due to the internal pressure that increases as the internal volume decreases.

Therefore, when filling the liquid in the state shown in FIG. 2, it is necessary to press the body 2 of the bottle 1 in advance to reduce the internal volume of the bottle 1, and then inject and seal the liquid. For example, by removing the pressing force acting on the body 2, a negative pressure is generated in the head space inside the bottle 1, and this negative pressure causes
As shown in FIG. 3, even if the shoulder portion 4 and the tapered portion 6 are deformed into an inverted curve, the pressure inside the bottle 1 does not become greater than atmospheric pressure, and as a result, the shoulder portion 4 and the tapered portion 6 which are invertedly deformed into a curved shape There is no need for the tapered portion 6 to reverse and return.

[Effect of idea]

As is clear from the above description, since the bottle 1 according to the present invention is a PET bottle that is biaxially stretched and blow-molded, it can obtain extremely excellent content resistance and excellent mechanical strength. In addition, due to the reverse curved deformation of the shoulder portion 4 and the tapered portion 6, the mouth tube portion 3 can be sufficiently tilted forward and displaced forward, and the posture obtained thereby is as follows. It becomes self-maintained and stable.

Furthermore, in addition to the reverse curved deformation of the shoulder portion 4 and the tapered portion 6, the bellows-like portion 5 is easily deformed by the action of an external force, and the mouth tube portion 3 can be tilted. Since it is a biaxially stretched bottle, conventional molding methods and molding equipment can be used as is, but the self-supporting ability of the bottle itself has been improved. It has many excellent functions and effects, such as the ability to easily and safely perform the filling operation of injecting the liquid into the bottle.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention.
FIG. 2 is a partially cutaway side view. FIG. 3 is a partially sectional side view of the mouth tube section in a state where it is tilted. FIG. 4 is a vertically sectional side view of the box showing a state in which the bottle according to the present invention is assembled into the box. Explanation of symbols, 1... Bottle, 2... Body, 3...
Mouth tube part, 4... Shoulder part, 5... Bellows-shaped part, 6... Tapered part, 7... Box, 8... Projection opening.

Claims (1)

[Scope of utility model registration request] A biaxial stretch blow-molded bottle made of polyethylene terephthalate resin that has been stretched and molded until it becomes sufficiently thin, and has a mouth tube connected to the upper end of the bottomed cylindrical body via a shoulder. The upper end portion of the body excluding the rear side portion is formed into a bellows-shaped portion having a bellows wall structure in which the valley line and the ridge line are inclined toward the boundary between the body and the shoulder portion on the rear side. A bottle body comprising a tapered portion of a tapered wall structure connecting the bellows-shaped lower end and an upper end of the body, and further forming the shoulder portion in the shape of a spherical arc shell wall that bulges upward.