JP5224162B2 - Synthetic resin round frame - Google Patents

Description

  The present invention relates to a round casing made of synthetic resin, and more specifically, absorbs a volume reduction deformation of the casing caused by decompression accompanying cooling after filling with a high-temperature content liquid by a reduced pressure absorption panel formed on the body. The present invention relates to a synthetic resin round casing.

  Conventionally, there is a so-called high-temperature filling method as a filling method for synthetic resin casings such as fruit juice drinks and polyethylene terephthalate (hereinafter referred to as PET) bottles such as tea that require sterilization. The casing is filled with the content liquid at the front and back temperatures, sealed with a cap, and then cooled. After cooling, the casing is in a considerably reduced pressure state.

For this reason, for applications involving high-temperature filling as described above, a vacuum absorbing panel is formed in the body, and the volume reduction deformation of the casing accompanying decompression is not given to the feeling that the casing has been deformed. In addition, a housing that exhibits a function of absorbing (relaxing) so as to be inconspicuous, that is, a so-called reduced pressure absorbing function is used.
For example, Patent Document 1 describes an invention relating to a round casing in which six vertically long vacuum absorbing panels are recessed and formed in an axisymmetric manner with respect to a central axis.

A casing 101 shown in FIG. 6 is a typical conventional example of a round casing in which a vacuum absorption panel 112 is formed on a trunk section 104, and has a capacity of 500 ml, a mouth tube section 102, a shoulder section 103, a trunk section. 104 and a bottom portion 105, and has a circumferential groove 107 at the upper and lower end portions of the body portion 104, and six decompression absorption panels 112 are surrounded by a step portion 111 between the upper and lower circumferential grooves 107. Are formed in parallel in the circumferential direction symmetrically about the central axis. In addition, the portion remaining between the adjacent reduced-pressure absorption panels 112 functions as a column portion 113 that bears the buckling strength of the housing.
Japanese Patent Laid-Open No. 10-58527

By the way, as the housing becomes smaller and the filling temperature becomes higher, how to design this vacuum absorption function depends on the degree of freedom related to appearance design, ensuring the rigidity of the housing or buckling strength, etc. Combined with requirements, it becomes a difficult problem to adjust.
Since the area of the peripheral wall of the body part that can be used as a vacuum absorption panel is limited in the case of about 500 ml or a more compact housing, the area of the vacuum absorption panel is simply widened for the required vacuum absorption function. May not be able to handle.

  Then, this invention makes it a subject to create the structure which concerns on the pressure reduction absorption panel for exhibiting the pressure reduction absorption function in a synthetic resin round casing more effectively.

The main means of the present invention for solving the above technical problem is:
A portion of the peripheral wall of the cylindrical body portion is surrounded by a stepped portion, and six decompression absorption panels recessed and formed in a concave shape are formed in parallel in the circumferential direction in axial symmetry with respect to the central axis. In the round frame with pillars remaining between the vacuum absorbing panels,
A configuration in which a groove-like transverse groove recess that crosses the pair of upper and lower column parts is formed at the upper and lower intermediate positions of the three column parts that are axially symmetrical so as to sandwich the central height position of the reduced pressure absorption panel.
It is said.

The basic idea of the above configuration is to achieve a large reduced pressure absorption function by integrally deforming the adjacent reduced pressure absorption panel including a part of the pillar portion into a depressed shape.
More specifically, by forming a transverse groove recess so as to cross the pillar portion at a predetermined height position and connecting the adjacent vacuum absorption panels, the pillar portion is divided by this transverse groove recess, so at the time of decompression The column portion in which the lateral groove recess is formed can be displaced inwardly within a certain range including the lateral groove recess. (Hereinafter, the column portion that can be displaced inwardly will be referred to as a variable portion.)

In the reduced pressure state, the adjacent reduced pressure absorption panels can be integrated and greatly deformed through the variable portion, so that in the height range where the variable portion is located, The span in the direction can be increased, and a large vacuum absorption function can be realized.
Here, by forming a pair of upper and lower lateral groove recesses so as to sandwich the central height position of the vacuum absorption panel, the column part portion divided vertically by the pair of lateral groove recesses is constant at the center height position. However, this column portion becomes a variable portion, and a large vacuum absorbing function can be exhibited.

Further, the lateral groove recess can be formed obliquely.
In addition, the formation depth of the lateral groove recess can be set deeply so as to be coplanar with the reduced pressure absorption panel in consideration of the balance between the reduced pressure absorption function and the buckling strength, leaving a part of the column part. Can be set shallower.

A configuration in which six vacuum absorption panels are formed in parallel with each other in an axially symmetrical manner is standard for a round casing formed with this type of vacuum absorption panel. By forming the lateral groove recesses in the three column portions that are symmetrically located (the center angle is located every 120 °), the column portions in which the lateral groove recesses are formed and the column portions that are not formed are sequentially arranged.
That is, a large vacuum absorbing function that connects adjacent vacuum absorbing panels is exhibited at three locations, while a function of maintaining the buckling strength of the frame by the pillar portions that do not form three lateral groove recesses is exhibited. It is possible to provide a balanced body.

  Of course, in the case of the round housing in which the six vacuum absorbing panels are formed in parallel with each other in the above-mentioned axial symmetry, the lateral groove recesses are formed only on the pair of diagonal pillars in consideration of the balance between the vacuum absorbing function and the buckling strength. It is also possible to adopt a configuration in which horizontal groove recesses are formed in all column portions.

  Still another means of the present invention is to form a pair of circumferential grooves directly above and directly below the vacuum absorbing panel.

  With the above configuration, by forming a pair of circumferential grooves directly above and below the vacuum absorption panel, the function as a circumferential rib is exhibited, regardless of the large span depression deformation in the adjacent vacuum absorption panel in a reduced pressure state. Therefore, it is possible to determine the upper limit and the lower limit of this deformation range, eliminate the deformation at the shoulder portion or the bottom portion, and more reliably retain the function of the housing such as good appearance or self-supporting property.

Since the present invention has the above-described configuration, the following effects can be obtained.
That is, in what has the main structure of this invention, the decompression absorption panel which adjoins including a part of pillar part can be integrally deform | transformed into a depression shape, and a big decompression absorption function can be implement | achieved.
Furthermore, by forming a pair of lateral groove recesses on the top and bottom so as to sandwich the center height position of the vacuum absorption panel, the column part divided into the upper and lower parts becomes a variable position part, and a large vacuum absorption function can be exhibited. .

And , in the case of forming six vacuum decompression panels in parallel and forming the lateral groove recesses in the three axially positioned column parts, there are three large vacuum absorption functions connecting the adjacent vacuum absorption panels. On the other hand, the function of maintaining the buckling strength of the housing is exhibited by the pillar portion that does not form the three lateral groove recesses, and a housing in which both are balanced can be provided.

  Further, in the case where a pair of circumferential grooves are formed directly above and below the vacuum absorbing panel, the extent of this deformation is covered regardless of the large span depression deformation in which the adjacent vacuum absorbing panels are connected in a vacuum state. The upper and lower limits can be determined, the deformation at the shoulder or the bottom can be eliminated, and the function of the housing such as good appearance or self-supporting can be more reliably maintained.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a synthetic resin round casing of the present invention will be described along examples with reference to the drawings.
FIG. 1 is a front view showing an example of a round housing, FIG. 2 (a) is a plan sectional view taken along line AA in FIG. 1, and FIG. It is a plane sectional view shown along B line.
Note that a circumscribed circle indicated by a two-dot chain line in FIG. 2 or FIGS. 3, 5, and 7 described later represents the cylindrical shape of the trunk portion 4 as a base.

  This casing 1 is a biaxially stretched blow-molded product made of polyethylene terephthalate resin, and its basic shape is similar to the round casing 101 of the conventional example shown in FIG. It has a mouth tube part 2, a shoulder part 3, a body part 4 and a bottom part 5. In addition, circumferential grooves 7 are formed at the upper and lower end portions of the body portion 4, and the six decompression absorption panels 12 are symmetrically centered between the upper and lower circumferential grooves 7 so as to surround the periphery of the step portion 11. They are formed in parallel. Further, the portion that remains between the adjacent reduced-pressure absorption panels 12 functions as a column portion 13 that bears the buckling strength of the housing 1.

The feature of this example is that in the three pillar portions 13a that are axially symmetric among the six pillar portions 13 (the central angle is located every 120 °), the central height position of the pillar portion 13a (the reduced pressure absorption panel) The groove-shaped lateral groove recess 15 that connects the adjacent vacuum absorbing panels 12 across the column portion 13a is formed.
In this example, the formation depth of the lateral groove recess 15 is set so that its bottom surface is flush with the adjacent reduced pressure absorption panel 12.

  In this way, by forming the lateral groove recesses 15 at the two upper and lower positions and connecting the adjacent reduced pressure absorption panels 12, the column part 13 a divided vertically is formed in a cantilever shape with the upper end part and the lower end part as fulcrums. In particular, a large displacement in the inner direction of the body 4 is possible near the center height position.

  In this way, a variable position that can be largely deformed is formed in the vicinity of the central height position of the column portion 13a, and the adjacent decompression absorption panels 12 are integrated with each other through the variable position, and the periphery of the depression-shaped deformation is formed. The span in the direction can be increased, and a large reduced pressure absorption function can be exhibited.

FIG. 3 is a schematic explanatory view showing a deformation mode of the flat cross-sectional shape shown along the line BB in FIG. 1 in the reduced pressure absorption state, and the column portion 13a in which the lateral groove recess 15 is formed in this way. Since the portion is displaced inward (in FIG. 3, the shape before deformation is indicated by a one-dot chain line), in the vicinity of the central height position, the column portion 13b that is not formed with every other horizontal groove recess portion 15 is left and right. It becomes a depression-like deformation with a large span as a fixed point, and a large vacuum absorbing function is exhibited.
On the other hand, if the deformation span is increased in this way, the depression-like deformation may become an irregular shape, but the column portion 13a located at the center of the left and right acts as a rib, Effectively suppress distorted deformation.

FIG. 7 is a schematic explanatory view showing a modification of the flat cross-sectional shape shown along the line DD in FIG. 6 in the vacuum absorption state of the conventional case 101 of FIG. (In FIG. 7, the shape before deformation is indicated by a one-dot chain line.)
In this conventional case 101, not all the column parts 113 are displaced inward of the body part 104, and the depression-like deformation of the vacuum absorbing panel 112 is fixed at both ends by the adjacent column parts 113. 3, the amount of deformation is limited.

On the other hand, in the case 1 of this example, the remaining three pillar portions 13b positioned symmetrically are configured so as not to form the lateral groove concave portion 15, and the three pillar portions positioned symmetrically about the axis. 13b exerts the function of maintaining the buckling strength of the casing 1, and the functions of the column portion 13a and the column portion 13b combine to exhibit a large pressure reducing function without greatly impairing the buckling strength. Can do.

Next, FIG. 4 is a front view showing the actual施例round bottle body according to the present invention.
The basic shape of the casing 1 is the same as that of the casing 1 of the example shown in FIG. 1, but the feature of this embodiment is that it is positioned axially symmetrically among the six pillars 13 (the central angle is 120). In the three pillar portions 13a (positioned at each angle), a pair of upper and lower lateral groove recesses 15a and 15b are formed across the center height position of the pillar portion 13a .

  As described above, the column portion 13a portion vertically divided by the pair of lateral groove recess portions 15a and 15b remains in the central height position within a certain height range. It becomes a variable part that can be displaced inwardly, and can exert a large decompression absorption function.

FIG. 5 is a schematic explanatory view showing a modification of the flat cross-sectional shape shown along the line CC in FIG. 4 in a reduced pressure absorption state. (In FIG. 5, the shape before deformation is indicated by a one-dot chain line.)
As shown in this figure, the column part 13a part divided into upper and lower parts becomes a variable position part that can be largely displaced inward, and the adjacent reduced pressure absorption panels 12 are integrated via the variable position part, and are depressed. The span in the circumferential direction of deformation can be increased, and a large reduced pressure absorption function is exhibited.

As mentioned above, although embodiment of this invention was described along the Example, this invention is not limited to this Example.
The number of the vacuum absorbing panels formed is not limited to six, and as described above, in which column portion of the plurality of column portions, the position where the lateral groove recess 15 is formed depends on the vacuum absorbing function. It can be set to various modes in consideration of the aspect of the depression-like deformation, the rigidity of the casing, the buckling strength, the appearance of the casing, and the like.

In addition, the lateral groove recess 15 can be formed in various forms. In the above embodiment, the lateral groove recess 15 is formed horizontally, but it may be set so as to cross obliquely. In the above embodiment, the formation depth of the lateral groove recess 15 is set so that its bottom surface is flush with the adjacent decompression absorption panel 12 so that the decompression absorption function can be sufficiently exhibited. Then, it can be set shallower leaving a part of the pillar part.

  For example, in the above embodiment, among the six vacuum absorption panels 12, the lateral groove recess 15 is formed in the three axially symmetrical column portions 13a. However, in consideration of the balance of the above-described vacuum absorption function and the like. Thus, the lateral groove recesses 15 can be formed in the pair of column portions 13 positioned diagonally, or the lateral groove recesses 15 can be formed in all the column portions 13.

  As described above, the synthetic resin round casing of the present invention is capable of exhibiting a large reduced pressure absorption function, and is expected to be widely used in applications where a large reduced pressure state is expected, such as high temperature filling.

It is a front view which shows the example of a round frame. (A) is the plane sectional view shown along the AA line in Drawing 1, (b) is the plane sectional view shown along the BB line. It is a schematic explanatory drawing which shows the deformation | transformation aspect of the plane cross-sectional shape shown along the BB line in FIG. 1 in a pressure reduction state. It is a front view showing the actual施例round bottle of the present invention. It is a schematic explanatory drawing which shows the aspect of a deformation | transformation of the plane cross-sectional shape shown along CC line in FIG. It is a front view which shows the prior art example of the round frame which formed the reduced pressure absorption panel. It is a schematic explanatory drawing which shows the deformation | transformation aspect of the flat cross-sectional shape shown along the DD line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 7; Circumferential groove 11; Step part 12; Depressurization absorption panel 13 (13a, 13b); Column part 15 (15a, 15b); Concave part 101; Housing 102; Mouth tube part 103; Shoulder part 104; Body part 105; Bottom part 107; Circumferential groove 111; Step part 112;

Claims (3)

A part of the peripheral wall of the cylindrical body part (4) is surrounded by a step part (11), and the six vacuum absorption panels (12) formed in a concave shape are axisymmetric with respect to the central axis in the circumferential direction. In parallel, and a columnar body (13) formed between the adjacent vacuum absorbing panels (12) adjacent to each other,
A groove shape crossing the pair of upper and lower column parts (13 a ) with the central height position of the reduced pressure absorption panel (12) sandwiched between the upper and lower middle positions of the three column parts (13a) located symmetrically about the axis. A synthetic resin round casing characterized in that it is configured to form a lateral groove recess (15). The synthetic resin round casing according to claim 1, wherein the formation depth of the lateral groove recess (15) is set so as to leave a part of the column portion (13). The synthetic resin round casing according to claim 1 or 2 , wherein a pair of circumferential grooves (7) are formed immediately above and immediately below the vacuum absorbing panel (12).

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