JP5754615B2 - Synthetic resin round frame - Google Patents

Description

  The present invention relates to a synthetic resin round casing including a vacuum absorbing panel in a body portion.

  Conventionally, so-called high temperature filling has been used as a filling method for synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin casings (pet bottles) that require sterilization, such as fruit juices and tea. However, the casing is filled with the content liquid at a temperature of about 90 ° C., sealed with a cap, and then cooled. After cooling, the casing is considerably decompressed.

Therefore, for applications involving high temperature filling as described above, a vacuum absorption panel is formed in the body, and the volume reduction deformation of the casing accompanying decompression is conspicuous without giving the feeling that the casing has been deformed. A heat-resistant bottle that exhibits a function of absorbing (relaxing) such as so-called reduced pressure absorption is used.
For example, Patent Document 1 describes an invention related to a round casing in which six vertically long vacuum absorption panels are recessed and formed in an axisymmetric manner with respect to a central axis.

JP 2003-63516 A

  Here, in the case of a relatively small internal capacity housing of about 1 liter or less, the surface area of the body portion is small, and it is difficult to ensure the area of the reduced pressure absorption panel for the required reduced pressure absorption capacity. Furthermore, if the area for forming the vacuum absorption panel is limited to the range of the lower half of the torso, etc. in terms of strength and rigidity, or with emphasis on design, the degree of vacuum inside the housing will gradually increase, There is a problem that the reduced pressure absorption capacity, which is a volume reduction deformation amount of the housing at the time when the peripheral wall of the trunk portion is locally depressed or buckled, is insufficient.

Therefore, the present invention has a technical problem to improve the reduced pressure absorption function of the reduced pressure absorption panel in the synthetic resin round casing without expanding the size of the area of the reduced pressure absorption panel.

Among the means for solving the above problems, the main configuration of the present invention is:
A circular housing in which a plurality of reduced pressure absorption panels are recessed in a circumferential direction in a predetermined height range of a cylindrical body portion, and a column portion is formed in a vertical direction between adjacent reduced pressure absorption panels. In
As seen from the flat cross-section, which is the left and right side edges of the vacuum absorbing panel, at the boundary between the arc-shaped column part and the inclined surface forming the left and right side edges of the vacuum absorbing panel in a recessed shape, A step portion having a gentle slope as compared with the inclined surface is provided , and this step portion is used as the left and right base end portions of the depression deformation .

When the degree of decompression in the housing is raised, the decompression absorption panel formed in a depression shape is further deformed into a depression shape with the boundary portion with the pillar as the base end portion, and the decompression absorption function is exhibited.
And according to the said structure, the step part of gentle inclination is arrange | positioned in the left-right side edge of a pressure-reduction absorption panel, and this step part is made into the right and left base end part of depression deformation, and the base end part is movable. The area can be enlarged, and as a result, the amount of deformation of the depression deformation of the vacuum absorbing panel accompanying the progress of the increase in the degree of vacuum can be increased to improve the vacuum absorbing function.

  According to another configuration of the present invention, in the main configuration described above, the step portion is extended to the upper end portion and the lower end portion of the vacuum absorption panel, and the vacuum absorption panel is surrounded by the step portion.

With the above configuration, by arranging the step portion so as to surround the vacuum absorption panel, the depression deformation of the vacuum absorption panel can be progressed more flexibly and greatly, and the vacuum absorption capacity is further improved by the vacuum absorption capacity. be able to.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the rounded casing having the main configuration of the present invention, at the boundary portion between the column portion and the inclined surface that forms the left and right side end portions of the vacuum absorbing panel in a recessed shape, in a chamfered shape, on the inclined surface In comparison, by arranging a step part with a gentle slope and making this step part the left and right base end parts of the depression deformation, the range of motion of this base end part can be increased, and as a result, the degree of decompression is reduced. It is possible to improve the reduced pressure absorption function by increasing the deformation amount of the depression deformation of the reduced pressure absorption panel as the ascent progresses.

It is a front view of one Example of the round housing of this invention. It is a top view of the housing of FIG. (A) is the AA line in FIG. 1, (b) is a BB line, (c) is a plane sectional view along CC line. It is a front view of the comparative example of a round frame. (A) is the AA line in FIG. 4, (b) is a BB line, (c) is a plane sectional view along CC line. (A) is the schematic for demonstrating the deformation | transformation aspect of the decompression absorption panel at the time of pressure_reduction | reduced_pressure of the housing of an Example, (b) is the housing of a comparative example. It is a graph which shows the analysis result concerning decompression absorption capacity.

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 one embodiment of a synthetic resin round casing of the present invention, FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3A is AA in FIG. (B) is a BB line, (c) is a plane sectional view along a CC line. This housing 1 is a biaxially stretched blow molded product made of PET resin, and has a mouth tube part 2, a shoulder part 3, a cylindrical body part 4, and a bottom part 5. The overall height is 260 mm, the diameter is 83 mm, commonly known as It is a round housing with a capacity of 1 liter.

  Six circumferential grooves 7 are formed in the upper half portion of the body portion 4, and six vertically elongated rectangular vacuum absorption panels 11 are recessed in the lower half portion so as to be adjacent to each other. 11, six column portions 6 that bear the rigidity and buckling strength of the housing 1 are formed in the vertical direction.

And the step part 12 is arrange | positioned in the frame shape at the peripheral part of each decompression absorption panel 11 as FIG. 1 shows.
As shown in FIGS. 3 (b) and 3 (c), the flat cross-sectional shape of the reduced pressure absorption panel 11 is composed of a stepped portion 12, an inclined surface 13 in which left and right side end portions are formed in a depressed shape, and a bottom portion 14. As shown in the enlarged view in FIG. 3 (c), the stepped portion 12 at the left and right side edges of the reduced pressure absorption panel 11 has a circular section 6 and the reduced pressure absorption panel 11 as viewed in a plan view. The left and right end portions are arranged in a chamfered shape at a boundary with the inclined surface 13 that is formed in a depressed shape, with a gentler inclination than the inclined surface 13.

Next, FIGS. 4 and 5 show a comparative housing 1 prepared for confirming the effects of the housing of the present invention. FIG. 4 is a front view, and FIG. A-A line, (b) is a BB line, (c) is a cross-sectional plan view along the CC line.
The shape of the housing 1 of this comparative example is the same as that of the housing 1 of the above embodiment except that the stepped portion 12 is not provided at the peripheral edge of the reduced pressure absorption panel 11.
That is, in the case 1 of the comparative example, as shown in the enlarged view in FIG. 5C, at the left and right side edges of the reduced pressure absorption panel 11, the arc-shaped column portion 6 and the reduced pressure absorption panel are seen in a plan view. The inclined surface 13 which forms the left-right side edge part of 11 in the shape of a depression has crossed directly.

FIG. 7 shows the results of analyzing the vacuum absorption capacity of the casings of the above examples and comparative examples. The horizontal axis represents the degree of vacuum (kPa), and the vertical axis represents the absorption capacity (ml). and a graph, the results of measurement of the bottle of example illustrates a line Test1, show the measurement results of the bottle of Comparative example by lines Test2.

And the pressure reduction intensity | strength and the pressure reduction absorption capacity | capacitance in the point which illegal deformation | transformation finally generate | occur | produces and the point shown by S1 and S2 in the figure were as follows.
-Example housing; 15.0 kPa, 52.7 ml
・ Comparative body: 11.8 kPa, 36.4 ml
In the case 1 of the embodiment, local deformation occurs at the position indicated by hatching in FIG. 1, that is, at the upper end portion of the column part 6, at the point S <b> 1 in FIG. 7. 1, local deformation occurs at the point S <b> 2 in FIG. 7, at the position indicated by hatching in FIG. 4, that is, at the central height position of the column part 6.

From the above result, the vacuum absorption capacity of the case of the example was improved by about 45% compared to the case of the comparative example, and the effect of the step portion 12 in the present invention was confirmed.
Further, the line of Test 1 in FIG. 7 has a larger rising angle with respect to the horizontal axis than the line of Test 2, and from this point, the case of the example is less susceptible to the increase in the degree of decompression than the case of the comparative example. It was found that body volume reduction deformation proceeds more flexibly.

Here, FIG. 6 schematically shows a result of analyzing the deformation mode of the vacuum absorption panel during the above-described vacuum absorption capacity measurement test, in a plane cross-sectional view along the line CC in FIGS. 1 and 4. (A) is about the case of an Example, (b) is about the case of a comparative example.
Each of the two-dot chain lines shows a depression-like deformation mode of the reduced-pressure absorption panel 11, but in the case of the embodiment, compared to the inclined surface 13 in which the left and right end portions of the reduced-pressure absorption panel 11 are formed in a depression shape. Since the gently inclined step portion 12 becomes the left and right base end portions of the depression deformation, the movable range of the base end portion is increased, and the depression deformation amount of the reduced pressure absorption panel 11 can be increased with respect to the casing of the comparative example. I understood.

As mentioned above, although embodiment of this invention and its effect were demonstrated along the Example, embodiment of this application is not limited to this Example.
In the above embodiment, an example of a round housing having a PET resin capacity of 1 liter, a large number of circumferential grooves disposed in the upper half of the body, and a vacuum absorbing panel disposed in the lower half is shown. However, the effects of the present invention are sufficiently exerted on other synthetic resin casings and other capacity casings.
Also, the decompression absorption panel is arranged not only in the lower half, but also in the entire height region of the body, if necessary, only in the upper half, and further in two stages, the upper half and the lower half. It can also be arranged on both sides. Further, the number of the vacuum absorbing panels and the shape thereof can be appropriately set according to the purpose of use, and are not particularly limited.

Further, in the above embodiment, the step portion is provided so as to surround the vacuum absorption panel. However, even if the step portion is provided only on the left and right side edges, the effect of improving the pressure reduction absorption capacity is provided. The effect is fully demonstrated.
In addition, the shape of the stepped portion such as the width and the degree of inclination can be determined as appropriate in consideration of the effect of improving the reduced pressure absorption capacity, the buckling strength, and the appearance design.

As described above, the synthetic resin round casing of the present invention greatly improves the vacuum absorbing function of the vacuum absorbing panel, and is particularly compact or has a reduced pressure absorbing panel disposed from the casing or design surface. A wide range of usage development is expected in the case where the possible area is limited.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6; Column part 7; Circumferential groove 11;

Claims (2)

A plurality of reduced pressure absorption panels (11) are recessed in parallel in the circumferential direction in a predetermined height range of the cylindrical body (4), and a column portion (6) between adjacent reduced pressure absorption panels (11). ) In a vertical shape that remains in the vertical direction,
The left and right side edges of the reduced pressure absorption panel (11), as seen in a flat cross section, the arcuate pillars (6) and inclined surfaces that form the left and right side ends of the reduced pressure absorption panel (11) in a recessed shape ( 13), a step portion (12) having a gentle slope compared to the inclined surface (13) is disposed in a chamfered shape at the boundary portion with the step (13), and the step portion (12) is provided on the left and right bases of the depression deformation. A synthetic resin round casing characterized by having an end . The step portion (12) extends from the upper end portion and the lower end portion of the reduced pressure absorption panel (11), and the step portion (12) surrounds the reduced pressure absorption panel (11). Round enclosure.

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