JP5630730B2 - Synthetic resin round frame - Google Patents

Description

The present invention relates to a synthetic resin round casing intended to freeze and use a content liquid mainly composed of water.

Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used for beverages such as water, sports drinking water, tea and juice. Moreover, this kind of housing is commercialized in the state which coat | covered the trunk | drum with the printed shrink film from a viewpoint of the display of a brand name etc. or a design. For example, Patent Document 1 describes an invention related to a round casing whose body is covered with a shrink film. On the other hand, in the summer, etc., such a housing is also used for drinking while gradually melting the one in which the content liquid is frozen in a freezer.

JP 2001-322616 A

Here, when water is frozen, its volume is approximately 1.09 times, so in a case sealed with a cap, the internal pressure may increase due to the increase in volume accompanying freezing, or the case may be damaged. There is a problem of detachment or damage.
Further, there is a problem that even if the casing is not damaged, the casing is greatly deformed and the appearance is impaired, and the bottom portion is deformed and the standing property of the casing is impaired.

Here, the conventional example of the round casing is shown in FIG. 5 and FIG. 6, but if a concave portion is formed on the peripheral wall of the trunk section 104 like the decompression absorption panel 107 of the casing 101, A function of absorbing the volume increase of the content liquid accompanying freezing (hereinafter referred to as a volume increase absorption function) can be exhibited by the bulging deformation of this portion.
However, in the case where the outer casing is covered with the shrink film 109 as in the case 101 of FIGS. 5 and 6, the shrink film 109 breaks due to the bulge of the concave portion (see the portion indicated by the two-dot chain line in FIG. 6), or There is a problem that even if it does not reach breakage, wrinkles occur and the product cannot be provided.

Therefore, the present invention is effective in the volume increase absorption function related to the volume increase of the content liquid accompanying freezing without impairing the appearance and the self-supporting property including the exterior of the shrink film in the synthetic resin round casing. It is an object to create a shape of the bottom part that can be demonstrated to the user.

Of the means for solving the above problems, the main configuration of the present invention is as follows.
For the purpose of freezing the content liquid containing water as the main component and using it in a synthetic resin round casing with a cylindrical body,
On the bottom surface of the bottom portion, there is a grounding portion disposed in the peripheral portion, and a depressed portion formed by sinking the bottom wall in the inner direction of the housing with the inner peripheral end of the grounding portion as a base end,
In the central part of this depressed part is arranged a depressed concave part formed in a dome shape,
Also, one ridge formed by projecting the bottom wall in the circumferential direction between the outer peripheral edge of the depressed recess and the inner peripheral edge of the grounding portion and projecting in the outer direction along the circumferential direction is disposed. Then, a step portion formed in a reduced diameter shape is disposed on the inner side of the ridge,
It is possible to absorb the volume increase due to freezing of the content liquid by the elastic bulging downward displacement of the bottom wall forming the depression, and the ridge protrudes below the grounding portion due to the downward displacement, and the grounding portion is replaced. It is said that it is set as the structure which exhibits a grounding function.

The casing having the above-described structure is intended to exhibit a volume increasing absorption function related to freezing of the content liquid by a bulging downward displacement of a depression formed at the bottom.
An unprecedented feature of the above configuration is that the protrusion protrudes below the grounding portion due to the downward displacement of the depressed portion and exhibits a grounding function instead of the grounding portion. Even when the depressed part exceeds the grounding part disposed on the peripheral part due to icing, and the ridge protruding downward from the grounding part exerts a function as the grounding part even when displaced downward in a bulging shape, It becomes possible to ensure sufficient independence of the frame.

In addition, as described above, the protrusions function as a grounding portion, so that the depressed portion can be greatly displaced downward without considering the securing of the independence by the grounding portion, and the volume increase absorption function is sufficiently large. It will be possible to demonstrate.
Further, by disposing the protrusion along the circumferential direction in the vicinity of the outer peripheral edge of the depression, the rib-like action of this protrusion is exhibited, and the downward displacement of the depression described above is caused along the circumferential direction. Uniform, that is, isotropic development can be achieved, local displacement of the depression can be suppressed, appearance damage can be effectively suppressed, and the function as a grounding part by the above protrusion can be fully exhibited It becomes possible to make it.

Moreover, since the cylindrical shape of the trunk portion is maintained even when icing has progressed, problems related to breakage and misalignment of the shrink film sheathed on the trunk portion can be avoided.
Further, when the content liquid is thawed during use, the depressed portion returns to its original shape by an elastic restoring force, and the grounding portion again exhibits the grounding function.

  Another configuration of the present invention is such that, in the main configuration, the ridge is a circumferential ridge.

  With the above configuration, by using the protrusion as the peripheral protrusion, the peripheral rib action is more effectively exhibited, and the downward displacement of the depressed portion can be more isotropically advanced.

  Still another configuration of the present invention is such that, in the main configuration described above, a depressed recess is disposed through a stepped portion formed in a reduced diameter inside the protrusion.

  According to the said structure, a rib and the effect | action of the surrounding rib of a step part can combine, and the downward displacement of a depression part can be advanced more smoothly isotropically.

  Still another configuration of the present invention is that the cross-sectional shape of the ridge is U-shaped in the above main configuration.

  With the above-described configuration, the grounding function can be stably exhibited by using the tip portion protruding from the U-shaped cross section.

  Still another configuration of the present invention is that, in the main configuration described above, a plurality of circumferential groove ribs are formed in the body portion.

With the above configuration, by forming a plurality of circumferential groove ribs in the cylindrical body, the surface rigidity of the body is increased to provide high shape retention, and when the inside of the housing is in a reduced pressure state In addition, local depression deformation of the body can be effectively suppressed.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the case having the main configuration of the present invention, the depressed portion is displaced from the grounding portion disposed on the peripheral portion by icing of the content liquid, and even when displaced downward in a bulging shape, than the grounding portion. The projecting ridge that projects downward functions as a grounding part, so that the self-sustainability of the housing can be sufficiently secured, and the depressed part is greatly lowered without considering the securing of the self-sustainability by the grounding part. It can be displaced, and the volume increase absorption function can be sufficiently exerted.

In addition, by arranging a protrusion near the outer peripheral edge of the depression, the downward displacement of the depression can be made isotropically and uniformly along the circumferential direction, and local deformation of the depression can be achieved. It is possible to suppress the volume increase absorption function related to freezing of the content liquid without impairing the appearance.
Note that the housing of the present invention is intended to exhibit the function of increasing the volume of the liquid content related to freezing due to the bulging downward displacement of the depressed portion. Since the shape of is maintained, problems relating to breakage and misalignment of the shrink film sheathed on the body portion can be avoided.

It is a front view which shows one Example of the housing of this invention. It is a bottom view of the housing of FIG. It is a longitudinal cross-sectional view which expands and shows the bottom part vicinity of the housing of FIG. It is a longitudinal cross-sectional view which expands and shows the bottom part vicinity of the housing of a comparative example. It is a front view of the housing of a prior art example. FIG. 6 is a plan sectional view of the housing of FIG. 5 taken along the line AA in FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 to 3 show a first embodiment of a synthetic resin casing according to the present invention. FIG. 1 is a front view and FIG. 2 is a bottom view.
FIG. 3 is an enlarged longitudinal sectional view showing the vicinity of the bottom 5, and a two-dot chain line in the figure shows a state in which the bottom wall is displaced downward in a bulging manner as the content liquid freezes.
This housing 1 is a biaxially stretched blow-molded product made of PET resin having a mouth tube part 2, a shoulder part 3, a cylindrical body part 4, and a bottom part 5 and having a capacity of 280 ml.

The body 4 is formed with three circumferential groove ribs 7 as one means for increasing the surface rigidity, so that the body 4 has high shape retention. Of course, the means for increasing the surface rigidity is not limited to the circumferential groove rib 7.
And the bottom part 5 is connected to the lower end of this trunk | drum 4 via the heel wall part 11 shape | molded by the curved cylinder shape, and the peripheral part 12 of the bottom face of this bottom part 5 is the grounding part 12s. .

Further, the inside of the peripheral edge portion 12 is a depressed portion 16 in which the bottom wall is depressed in the inner direction of the housing.
The shape of the depressed portion 16 as a whole is approximately a truncated cone shape. However, a depressed recess 15 formed in a dome shape is formed in the center portion, and a bottom wall is formed along the circumferential direction in the vicinity of the outer peripheral edge portion. A protrusion 13 having a U-shaped cross section formed by projecting outward is provided as a peripheral protrusion, and further, a step formed inside the protrusion 13 with a reduced diameter upward. The portion 15 s is connected to the proximal end portion of the depressed recess 15 .

  As shown in FIG. 1, the height range from the lower end of the shoulder 3 to the lower end of the trunk 4 is covered with the shrink film 9 over the entire circumference of the casing 1 of the above-described embodiment. Filled with water at 20 ° C so that the head space is 14 ml, sealed with a cap, and then placed in a freezer at -20 ° C in an upright state to freeze the water inside. The deformation of the casing 1 and the change in the state of the shrink film 9 were observed.

  After the above-mentioned freezing experiment, no deformation of the peripheral wall was observed from the shoulder 3 to the body 4, so that the shrink film 9 was not broken and almost no wrinkles were observed. On the other hand, as shown by a two-dot chain line in FIG. 3, the bottom wall is in a state in which the depressed portion 16 bulges in the outward direction of the housing 1 and greatly descends over the grounding portion 12s. It was confirmed that the volume increase absorption function related to freezing of the content liquid was sufficiently exhibited by the displacement.

Further, after the downward displacement of the depressed portion 16, the ridge 13 protrudes downward from the grounding portion 12 s as shown by a two-dot chain line in FIG. 3, and this ridge 13 exhibits a grounding function instead of the grounding portion 12 s. Thus, it was confirmed that the standing property of the housing 1 can be sufficiently maintained even in an icing state.
Here, the action and effect of the peripheral rib of the protrusion 13 disposed in the vicinity of the outer peripheral edge portion of the depressed portion 16 and the action and effect of the step portion 15s are combined, and the downward displacement of the depressed portion 16 is circumscribed. It can be developed uniformly along the direction, that is, isotropically, and local deformation of the depressed portion 16 can be suppressed, and appearance damage can be effectively suppressed. It was confirmed that it was demonstrated stably.

  Next, the overall shape of the housing of the above embodiment is the same as the housing of the embodiment shown in FIGS. Without preparing the case of the comparative example having the shape as shown by the solid line in FIG. 4, the outer case was covered with a shrink film in the same manner as the case of the example, and the freezing experiment was conducted. We observed body deformation and changes in exterior condition due to shrink film.

And even in the case of this comparative example, there was no breakage of the shrink film and almost no occurrence of wrinkles.
On the other hand, the downward displacement of the depressed portion 16 does not progress uniformly along the circumferential direction, that is, isotropically. For example, as shown by a two-dot chain line in FIG. Although the increased absorption function was exhibited, the result was that the standing property was impaired along with the appearance.

As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.
For example, the cross-sectional shape, width, protrusion height, etc. of the ridge 13 consider the size and thickness of the housing, the independence of the housing, etc., and relate to deformation modes such as ease of deformation of the bottom wall. It can be set as appropriate based on calculations and test results.
In the above embodiment, the protrusions 13 are circumferential protrusions. However, a large number of protrusions 13 may be arranged in a circumferential shape with the notches interposed therebetween.

As described above, the synthetic resin round casing of the present invention can be used safely without damaging the appearance and standing even when the content liquid is frozen, and the field where the content liquid is frozen Wide use is expected.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 7; Circumferential groove rib 9; Shrink film 11; Heel wall part 12; Peripheral part 12s; 15s; Step 16; Depression 101; Housing 102; Mouth tube 103; Shoulder 104; Body 105; Bottom 106; Circumferential groove 107; Vacuum absorbing panel 109;

Claims (4)

A synthetic resin round casing having a cylindrical body (4) for the purpose of freezing and using a content liquid mainly composed of water,
On the bottom surface of the bottom portion (5), the grounding portion (12s) disposed on the peripheral edge portion (12) and the bottom wall on the inner peripheral end of the grounding portion (12s) are recessed toward the inside of the housing. Having a depression (16) formed,
A recessed portion (15) formed in a dome shape is disposed in the central portion of the recessed portion (16), and the outer peripheral edge portion of the recessed portion (15) and the inner peripheral edge of the grounding portion (12s) One ridge (13) formed by projecting the bottom wall in the circumferential direction to the outside of the housing is disposed inside the grounding portion (12s) between the ridge (13) A step portion (15s) formed in a reduced diameter toward the upper side is disposed inside,
It is possible to absorb the volume increase due to freezing of the content liquid by the elastic bulging downward displacement of the bottom wall forming the depression (16), and the downward displacement causes the ridge (13) to be in contact with the grounding portion ( A synthetic resin round casing characterized in that it projects downward from 12s) and exhibits a grounding function instead of the grounding part (12s).   The synthetic resin round casing according to claim 1, wherein the protrusion (13) is a peripheral protrusion. The synthetic resin round casing according to claim 1 or 2, wherein the protrusion (13) has a U-shaped cross section. The synthetic resin round casing according to claim 1, 2 or 3 , wherein a plurality of circumferential groove ribs (7) are formed on the cylindrical body (4).

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