JP5035680B2 - Synthetic resin housing - Google Patents

Description

  The present invention relates to a synthetic resin casing, and more particularly to a synthetic resin casing in which a peripheral wall of a body portion has a reduced pressure absorption function.

  Conventionally, synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin have been widely used as containers for various beverages, but these casings have a thin wall for reducing material costs. Along with this trend, how to ensure sufficient rigidity and strength as a housing and how to absorb inconspicuous deformation of the body wall due to pressure fluctuations in the housing is a major issue in the shape design of the housing.

  For example, Patent Document 1 has a description of a casing in which a reduced pressure absorption panel is provided on a peripheral wall of a trunk portion. This casing is used for so-called high-temperature filling applications in which content liquids such as fruit juices and teas that require sterilization are filled at a high temperature of about 90 ° C. The casing is filled with the content liquid at a temperature of about 90 ° C., sealed with a cap, and then cooled, so that the casing is considerably decompressed and deformation of the peripheral wall of the trunk becomes a problem.

  FIG. 4 shows a small and round conventional casing 101 (PET bottle) having an internal volume of 350 ml, which is formed of a mouth tube portion 102, a shoulder portion 103, a trunk portion 104 and a bottom portion 105. The six vacuum absorption panels 111 are formed in a depressed shape so as to be surrounded by a stepped portion 110. The reduced pressure absorption panel 111 has a substantially flat plate shape, and when the inside of the housing 101 is in a decompressed state, the housing 101 can be easily deformed in a concave shape inside. A function of absorbing (relaxing) the reduced pressure state (hereinafter referred to as a reduced pressure absorption function) can be exhibited without giving a deformed feeling, that is, not conspicuous.

On the other hand, the rigidity or buckling strength related to the pressing force in the central axis direction of the housing, that is, the vertical direction, is mainly borne by the column portion 115 formed in an upright manner between the adjacent vacuum absorption panels 111. Further, the rigidity or buckling strength related to the pressing force in the direction perpendicular to the central axis direction, that is, the lateral direction is mainly borne by the short cylindrical annular portions 116t and 116b positioned above and below the vacuum absorbing panel 111. Accordingly, a circumferential groove 117 is formed in this portion to greatly exert the function of the circumferential rib, thereby increasing the lateral rigidity and buckling strength. The column portion 115 and the annular portions 116t and 116b ensure sufficient rigidity and strength in the vertical direction and the horizontal direction as described above, so that the content liquid filling process, the case transport line, the stack storage, and the vending machine In addition to sales, production, logistics, and sales, etc., and more generally, when external force acts on the housing, troubles due to deformation are prevented.
Japanese Patent Laid-Open No. 10-58527

  By the way, since the reduced-pressure absorption function is effectively exhibited, in many cases, a type of reduced-pressure absorption panel formed by being surrounded by the rectangular step shown in FIG. 4 has been conventionally used. In this type of vacuum absorption panel, even if there is a change in the shape inside the panel, the overall shape will be similar, naturally from the viewpoint of differentiating the product by the design of the housing There is a limit.

  Accordingly, an object of the present invention is to find an unprecedented peripheral wall shape capable of exhibiting a sufficient decompression absorption function, and has an unprecedented design and is applicable to uses such as high-temperature filling. An object is to provide a heat-resistant synthetic resin casing.

The basic configuration of the present invention for solving the above technical problem is as follows:
In the synthetic resin housing,
Disposing a cylindrical part at the upper end and lower end of the body part;
The height range between the upper and lower cylindrical portions is a top portion formed by arc-shaped line segments in at least three locations located at substantially equal central angles with respect to the central axis of the trunk portion, with a flat cross-sectional shape in this range. A non-cylindrical portion that is arranged and connected to the adjacent top portion by a flat line segment,
Forming a column portion formed in the vertical direction by the top portion, and forming a panel portion connecting adjacent column portions by a flat line segment;
In the non-cylindrical part, the pillar part and the panel part have a basic shape, and the peripheral wall is divided into a plurality of sub-panels surrounded by ridge lines in a range that does not impair the function related to the basic shape. Form,
It is said.

  According to the basic configuration of the present invention described above, first, the strength related to the lateral load is secured by the cylindrical portions disposed at the upper end portion and the lower end portion of the trunk portion, and there is a problem of clogging in the dispensing passage of the vending machine. In addition, in the conveyance line or the like, the adjacent housings can be brought into contact with the upper and lower cylindrical portions to achieve good line suitability.

  In addition, a column is formed in the vertical (vertical) direction as many as the number of arc-shaped apexes arranged at substantially equal center angles, and this column forms a solid column with a convex cross section, It can sufficiently bear the longitudinal buckling strength of the frame.

In addition, the panel portion formed by flat line segments and connecting adjacent column portions is flat, and when the housing is in a reduced pressure state, the entire panel portion is deformed into a depressed shape and absorbs a large amount of reduced pressure. Function is demonstrated.
Here, the column part is a solid part having a convex arc shape, and the degree of decompression is considerably increased, and even when the entire panel part is greatly depressed and deformed, the depressed part of the panel part is applied to the entire region of the pillar part. The basic function as a housing can be maintained without progress, and a sufficiently large decompression absorption function is exhibited as a whole non-cylindrical part.

In addition, as described above, the panel portion is a portion that exhibits a reduced pressure absorption function, and the flat line segment forming the panel portion is a straight line, a concave curve shape that is gently recessed inward, and further, these straight lines and a concave shape. It can be a combination of curves.
In addition, in order to enlarge the area of a panel part and to fully exhibit a reduced pressure absorption function, it is preferable to make the number of arrangement | positioning of a top part into the range of about 3-6.
Further, in this application, the terms concave (shape), convex (shape), and flat (shape) are used to express the curve property of a line segment or a surface, but the convex shape is bulging outward from the housing. This indicates that the concave is recessed inside the housing.

Another embodiment of the present invention is a basic configuration as described above, and disposed top to three, a shape having three rotational symmetry the flat cross-sectional shape of the non-cylindrical portion with respect to the central axis of the barrel It is said.

  With the above configuration, the cylindrical portion having a substantially triangular cross-sectional shape is firmly held in a triangular cylindrical shape by the three column portions and the three panel portions even when the degree of decompression increases. Combined with the solid shape of the columnar convex part, the basic function as a frame can be maintained even when the degree of decompression rises significantly and the entire panel part is greatly depressed and deformed. And the non-cylindrical portion as a whole can exhibit a larger reduced pressure absorption function.

  Still another configuration of the present invention is that, in the non-cylindrical portion, the diameter of the flat line segment portion is gradually reduced from the upper end portion and the lower end portion to the substantially central height position.

  With the above configuration, it is possible to increase the ratio of the flat line segment portion in the circumference of the peripheral wall near the center height position as compared with the upper end portion and the lower end portion, and as a result, the width of the region of the panel portion The upper and lower ends of the non-cylindrical part are constrained by the upper and lower cylindrical parts. As a result, it is possible to smoothly advance in the vertical direction.

  Further, since the waist portion is formed at a substantially central height position of the trunk portion, the appearance of the housing can be made clear, which is also preferable from the viewpoint of gripping properties of the housing. Furthermore, it is possible to make the deformation of the body portion inconspicuous during decompression or pressurization. Further, as the panel portion is depressed and deformed at the time of decompression, the column portion can be deformed in a bulging shape so as not to protrude outward from the outermost diameter determined by the upper and lower cylindrical portions.

Here, the casing of the present invention is characterized in that the longitudinal buckling strength is maintained by the column part of the trunk part, and the reduced pressure absorption function is exhibited by the panel part ,
In the non-cylindrical portion of the basic configuration of the present invention described above, the pillar portion and the panel portion have a basic shape, and the peripheral wall is divided into a plurality of sub-panels surrounded by ridge lines without impairing the function related to the basic shape. In the description of dividing and forming an uneven shape on the peripheral wall by this sub-panel,
When dividing the peripheral wall into a plurality of sub-panels surrounded by ridge, it is necessary to function is not impaired range of these pillar portion and the panel, this viewpoint et al., "Range without impairing the function of the basic shape" This requirement is added.

  And the number of sub-panels formed and their shapes are appropriately set in consideration of the design of the housing and the functions of the pillars and the panel, and in a range that does not impair the functions related to the basic shape. The present invention is not limited, and various variations of the uneven shape can be formed, and the shape of the peripheral wall can have an unprecedented design.

In addition, the curvature of the surface of the sub-panel can be appropriately formed with respect to the surrounding ridgeline, such as a gentle convex shape, a flat shape, or a gentle concave shape. By disposing the shaped sub-panel at a predetermined position, it becomes possible to control the starting point and the development direction of the depression deformation at the time of depressurization and to exhibit the depressurization absorption function more effectively.
In addition, each sub-panel can be formed not only in the pillar part or the panel part but also across the pillar part and the panel part.

  In still another configuration of the present invention, a region connecting the upper part of one pillar part to the lower part of the other pillar part is connected by a flat or concave sub-panel, and can be deformed into a slanted belt shape when decompressing. It is said that it is set as a reduced pressure absorption band.

  The above configuration is one form of the sub-panel arrangement mode for controlling the starting point and the progress direction of the depression deformation at the time of depressurization so that the depressurization absorption function can be exhibited more smoothly and effectively. By aligning the inclination direction of the formed vacuum absorption band, at the time of depressurization, combined with the depression deformation of the vacuum absorption band formed obliquely, the reduced diameter deformation accompanying torsional deformation along this vacuum absorption band, A larger vacuum absorption function can be exhibited.

Since the synthetic resin casing of the present invention has the above-described configuration, the following effects are exhibited.
In the structure having the basic structure of the present invention, the column part is a solid part having a convex shape in the shape of an arc, and even when the degree of decompression is significantly increased and the entire panel part is greatly depressed and deformed, The depression deformation of the part does not propagate to the entire region of the column part, the basic function as the housing can be maintained, and a sufficiently large decompression absorption function is exhibited as the whole non-cylindrical part.

  In addition, by dividing the peripheral wall into a plurality of sub-panels surrounded by ridge lines, various variations of uneven shapes can be formed on the peripheral wall, and the shape of the peripheral wall can have an unprecedented design.
In addition, by arranging the sub-panel having a shape that easily deforms during decompression at a predetermined position, it is possible to control the starting point and the direction of progress of the depressed deformation during decompression, and to effectively exhibit the decompression absorber. .

  In the case where the top part is three places and the flat cross-sectional shape of the non-cylindrical part is a shape having rotational symmetry three times with respect to the central axis of the trunk part, the cylindrical part having a substantially triangular cross-sectional shape is Even if the degree of decompression increases, the three cylindrical parts and the three panel parts firmly hold the triangular cylindrical shape, which is coupled with the fact that the pillar part is strong in the shape of an arc. Thus, even when the degree of decompression rises considerably and the entire panel part is greatly depressed and deformed, the basic function as a casing can be maintained, and the entire non-cylindrical part can exhibit a larger decompression absorption function. it can.

For non-cylindrical parts that gradually reduce the diameter of the flat line segment from the upper end and the lower end to the approximate center height position, use the vicinity of the center height position where the collapse deformation during decompression is reduced , Can progress smoothly in the vertical direction.

  In the case where the vacuum absorption band is formed by the sub panel, the depression deformation of the diagonal vacuum absorption band is combined with the reduced diameter deformation due to the torsional deformation along the vacuum absorption band. Absorption function can be exhibited.

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 an embodiment of a synthetic resin casing of the present invention. 1 is a front view as seen from the direction F in FIG. 3, FIG. 2 is an oblique front view as seen from the S direction, which is a direction orthogonal to the line DD in FIG. 3, and FIG. It is a plane sectional view along a line.
This casing 1 is a biaxially stretched blow molded product made of PET resin and has a mouth tube part 2, a shoulder part 3, a body part 4, and a bottom part 5, and falls into the category of a small bottle having a common capacity of 350 ml. The total height is 132 mm and the maximum diameter is 66 mm.

  Cylindrical portions 11a and 11b are disposed at the upper end portion and the lower end portion of the body portion 4. The upper and lower cylindrical portions 11a and 11b are provided with circumferential grooves 18a for improving lateral rigidity and strength, 18b is formed.

Between the upper and lower cylindrical portions 11a and 11b, a non-cylindrical portion 12 having a non-circular flat cross-sectional shape is disposed. FIG. 3 is a cross-sectional plan view at the height position of the AA line in FIG. 1, that is, the central height position of the non-cylindrical portion 12. This cross-sectional shape Cs has an arcuate shape at an equicenter angle of 120 °. Are formed by connecting the adjacent top portions 15 with a flat line segment 16 (shown by a two-dot chain line in FIG. 3). having a rotational symmetry.

And the plane cross-sectional shape of the part from the upper end part of the non-cylindrical part 12 to a center height position has the rotational symmetry of 3 times which consists of the above-mentioned top part 15 and the flat line segment 16 fundamentally. However, from a shape close to a circle having the diameters of the cylindrical portions 11a and 11b shown by the one-dot chain line in FIG. The diameter is gradually reduced to increase the ratio of the flat line segment 16 while continuously changing to the cross-sectional shape Cs at the center height position.

  As will be described later, in this embodiment, the peripheral wall of the non-cylindrical portion 12 is divided by a large number of sub-panels 25 so as to be surrounded by ridge lines 23, and the cross-sectional shape Cs in FIG. The cross-sectional shape of the two sub-panels 25 divided by the ridge line 23 appears outside the basic shape of the flat flat line segment 16.

Then, by forming a flat cross-sectional shape by the top portion 15 and the flat line segment 16 as described above, in the non-cylindrical portion 12, the three top portions 15 have three circular cross-sections in the vertical direction. 21 is formed, and a flat line segment 16 forms a panel portion 22 that connects adjacent column portions 21.
The basic shape of the panel portion 22 is flat in a flat cross section, and the flat line segment 16 has a gentle concave shape in the vertical cross section corresponding to the reduction in diameter toward the center height position. .
1 and 2, the boundary between the column portion 21 and the panel portion 22 is indicated by a vertical two-dot difference line, and the region of the column portion 21 and the panel portion 22 is indicated below the figure.

Next, in the housing 1 of the present embodiment, as shown in FIGS. 1 and 2, the three pillar portions 21 and the three panel portions 22 described above have a basic shape, and the peripheral wall is surrounded by a ridge line 23. Dividing into sub-panels 25, a large number of irregularities are formed on the peripheral wall.
These sub-panels 25 are not limited to the patterns shown in FIGS. 1 and 2, and are within a range in which the function of the column part 21 that bears the buckling strength in the vertical direction and the reduced pressure absorption function of the panel part 22 are not impaired. It can be formed in various patterns, and can provide a casing having various varieties of design features that have not been conventionally available.

  Further, the sub-panel 25 can be appropriately selected and arranged from a convex shape, a concave shape, a flat shape, etc. with respect to the surrounding ridge line 23. In addition to the design properties according to the above, it is possible to reinforce the function as a casing. For example, the reduced-pressure absorption function can be exhibited more effectively.

  In the case 1 of the present embodiment, four regions are connected from the upper part of one (left side in FIG. 1) of the adjacent column parts 21 to the lower part of the other (right side in FIG. 1) pillar part 21. It is configured to form a reduced pressure absorption band 27 that is connected by a concave sub-panel 25 and that deforms into a slanted band shape when the pressure is reduced. (The hatched area in FIGS. 1 and 2)

The formation of the reduced-pressure absorption band 27 is an example of an arrangement pattern of the sub-panel 25 for more effectively exerting the reduced-pressure absorption function, and the inclined reduced-pressure absorption band 27 is formed as shown in FIGS. Accordingly, the depression deformation can be caused to progress to the entire panel portion 22 and a partial region of the column portion 21 from the reduced pressure absorption band 27 at the time of decompression.
Further, when the degree of decompression increases, the non-cylindrical portion 12 undergoes a reduced diameter deformation due to a torsional deformation along the obliquely formed reduced pressure absorption band 27, and this reduced diameter deformation exerts a greater reduced pressure absorption function. be able to.

In addition, the arrangement pattern of the sub-panel 25 for smoothly progressing the depression deformation at the time of decompression is not limited to the pattern like the above-described decompression absorption band 27, and the shape of the sub-panel 25 constituting a predetermined region is the main pattern. By forming a concave shape or a flat shape as in the embodiment so that the sub-panel 25 located in the periphery is more easily depressed and deformed, the predetermined region can be more easily depressed and can be used as a starting point of the depressed deformation. it can.
Furthermore, according to the shape of the ridge line 23 surrounding the periphery, the surface property of the sub-panel 25, and the connection mode of the plurality of sub-panels 25, in addition to the vacuum absorption function, an arrangement pattern for strengthening the function of the housing such as strength is selected. can do.

In addition, in this embodiment, each sub-panel 25 is formed so as to straddle the column portion 21 and the panel portion 22 as in the sub-panel 25a in FIG. There is.
Thus, by forming the sub-panel 25a straddling the pillar part 21 and the panel part 22, the partition between the pillar part 21 and the panel part 22 is made indistinct, and an appearance like a round bottle is presented. You can also.
Further, with such a sub-panel 25a, the depression deformation at the time of depressurization can be propagated from the panel portion 23 to a part of the column portion 21 through the sub-panel 25a, so that the depressurization absorption function can be exhibited more greatly.

As mentioned above, although the structure and effect were demonstrated along the Example about the synthetic resin casing of this invention, the effect of this invention is not limited to the said Example.
For example, although the above embodiment is for a relatively small bottle having a nominal capacity of 350 ml, the effect of the present invention is of course also exhibited for a larger bottle.
Moreover, although the said Example is an example which has arrange | positioned the top part in three places, the number of arrangement | positioning can also be made into 4, 5 or 6 according to the objective in consideration of the designability and the function as a housing. .

  The synthetic resin casing of the present invention has an unprecedented design and can exhibit a sufficient vacuum absorption function, and can be used for a wide range of applications as a heat-resistant casing applicable to uses such as high-temperature filling. Expansion can be expected.

It is the front view which looked at one Example of the housing of this invention from the F direction in FIG. It is the diagonal front view which looked at the housing of FIG. 1 from the S direction in FIG. FIG. 2 is a plan sectional view taken along line AA in FIG. 1. It is a front view which shows an example of the conventional round housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Body part 5; Bottom part 11a, 11b; Cylindrical part 12; Non-cylindrical part 15; Top part 16: Flat line segments 18a, 18b; 22; Panel portion 23; Ridge lines 25 and 25a; Sub-panel 27; Decompression absorption band F and S; Direction Cs; Cross-sectional shape 101; Housing 102; Mouth tube portion 103; Shoulder portion 104; 111; vacuum absorption panel 115; pillars 116t and 116b; annular part 117; circumferential groove

Claims (4)

Cylindrical portions (11a, 11b) are arranged at the upper end and the lower end of the trunk (4),
The height range between the upper and lower cylindrical portions (11a, 11b) is a plane cross-sectional shape within the range, and is arcuate at least at three locations with substantially equal central angles with respect to the central axis of the barrel portion (4). Arrange the top (15) formed by line segments,
The non-cylindrical part (12) shaped to connect the adjacent top part (15) with a flat line segment (16),
Forming a column part (21) formed in the vertical direction by the top part (15),
It is configured to form a panel portion (22) that connects the adjacent column portions (21) by a flat line segment (16),
In the non-cylindrical portion (12), the pillar portion (21) and the panel portion (22) have a basic shape, and the peripheral wall is surrounded by the ridge line (23) within a range that does not impair the function related to the basic shape. A synthetic resin casing that is divided into sub-panels (25), and the sub-panel (25) has an uneven shape on the peripheral wall . Disposed apexes (13) in three positions, the non-cylindrical portion (12) of the flat cross section torso (4) a synthetic resin according to claim 1, wherein the shape having a 3-fold symmetry with respect to the central axis of Steel body. The synthetic resin casing according to claim 1 or 2, wherein the non-cylindrical portion (12) is configured such that the diameter of the flat line segment (16) is gradually reduced from the upper end portion and the lower end portion to a substantially central height position. The area connecting the upper part of one pillar part (21) to the lower part of the other pillar part (21) of the adjacent pillar part (21) is connected by a flat or concave sub-panel (25) to form an inclined band when decompressing. The synthetic resin casing according to claim 1, 2 or 3, wherein the pressure-absorbing absorption band (27) is deformable.

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