JP2007269360A - Synthetic resin-made round bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made round bottle which is capable of sufficiently demonstrating a vacuum absorbing function and safely used even in a pressure-filling process of a hot liquid content by suppressing any swelling deformation in a barrel having inclined panels. <P>SOLUTION: In the round bottle, a plurality of inclined panels 12 which are inclined in a predetermined direction are formed over a predetermined height range of a cylindrical barrel 4 in parallel in the peripheral direction in a recessed manner so as to surround the circumference thereof by a stepped part 10. An inclined pillar 11 is formed between the inclined panels adjacent to each other. The diameter of a barrel of the pillar is reduced from the upper end and the lower end of the pillar toward the center height position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is typified by a polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded bottle in which a plurality of inclined panels are formed in parallel in the circumferential direction on the body portion to constitute a reduced pressure absorption function portion. The present invention relates to the structure of a synthetic resin round bottle.

  A synthetic resin round bottle is known in which a plurality of inclined panels inclined at a fixed inclination angle are arranged in parallel in the circumferential direction on the body portion to constitute a reduced pressure absorption function portion.

The round bottle formed with this inclined panel is not only deformed inwardly by bending down the inclined panel due to the occurrence of decompression in the bottle, but also due to reduced diameter deformation due to torsional deformation of the body portion provided with the inclined panel. , Exerts a greater vacuum absorption function.
In addition, an inclined column portion is formed between adjacent inclined panels in the same manner as the inclined panel, but this column portion is formed in a spiral shape in a state of being inclined at a constant inclination angle with respect to the central axis of the round bottle. Since they are arranged, they are not on a flat surface but are convexly curved toward the outside of the bottle, and can exert a strong resistance against an external force from the lateral direction.
Japanese Utility Model Publication No. 6-59207

  As described above, the round bottle formed with the above-described inclined panel exhibits an excellent vacuum absorbing function. However, the characteristic of the round bottle that originally has a small deformation in the pressurized state is one of the advantages of the inclined panel. Part is damaged, especially when high-pressure content liquid is pressurized and filled, the bottle is greatly expanded and deformed by the pressure, and the shape of the so-called beer barrel shape where the vicinity of the center height position of the body is greatly expanded and deformed There is a problem of becoming.

  Therefore, the present invention was created to solve the above-described problems of the prior art, and has a technical problem of suppressing bulging deformation in a body portion provided with an inclined panel, and has a reduced pressure absorption function. It is an object of the present invention to provide a synthetic resin round bottle that can sufficiently exhibit the above-mentioned properties and can be used safely in the pressure filling process of a high-temperature content liquid.

Among the present invention for solving the above technical problems, the means of the invention according to claim 1 is:
Forming a plurality of inclined panels inclined in a certain direction over a predetermined height range of the cylindrically shaped body portion in a circumferential manner in a depressed shape so as to surround the periphery with a stepped portion,
To make an inclined column part between adjacent inclined panels,
Configuring to reduce the body diameter from the upper end and lower end positions of the column part toward the center height position,
It is in.

  According to the above configuration of the first aspect, by reducing the body diameter from the upper end and lower end positions of the column portion toward the center height position, for example, the inside of the bottle is in a pressurized state in the pressure filling process of the content liquid. In this case, the bulging deformation of the body portion in the vicinity of the central height position where the body diameter is small can be effectively suppressed, and the bottle can be prevented from becoming a so-called via barrel shape.

  In a normal round bottle, the upper and lower ends of the barrel are left with cylindrical portions and are formed with circumferential grooves that function as a peripheral rib. The bulge-like deformation of the entire body can be allowed by effectively suppressing the bulge-shaped deformation of the body in the vicinity of the center height position as described above. It can be suppressed within the range, and can be used with confidence in the pressure filling process of the high-temperature content liquid.

  On the other hand, when the bottle is in a reduced pressure state, the inclined panel is mainly deformed and deformed in a depressed shape, and the reduced pressure absorption function is exerted. Starting from the vicinity of the center height position, it can be smoothly advanced in the vertical direction, the appearance is not greatly impaired in a reduced pressure state, and local buckling deformation of the body wall can be suppressed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the diameter of the imaginary circle circumscribing the generatrix of the column part is reduced from the upper end and lower end positions of the column part to the center height position. The configuration is such that the diameter is reduced.

  According to the second aspect of the present invention, the diameter-reducing aspect of the body diameter is defined by the diameter-reducing aspect of the pillar portion, which is the main structural element against the action of force, and the bulging deformation in the pressurized state is defined. It becomes possible to suppress more reliably.

  The means of the invention described in claim 3 is that, in the invention described in claim 2, the degree of diameter reduction of the imaginary circle is set to a range in which the bus bar of each column part is convex outward of the bottle. .

  The column part formed between adjacent inclined panels is inclined in the same direction as the inclined panel. However, as described in more detail, this column part is constant with respect to the central axis of the round bottle. In this state, it is formed and arranged in a spiral shape so that it is inclined at the inclination angle of the column portion. It has become a strong resistance against the external force.

Then, the said structure of Claim 3 considers the said function by the bus-line of a pillar part being convexly curved toward the outer side direction of a bottle, The pillar part described in Claim 2 is considered. It defines the limit of the degree of diameter reduction.
That is, if the degree of diameter reduction of the column part described in claim 2 is excessively large, the bus bar of the column part is flat or curved concavely toward the outside of the bottle, and the external force from the lateral direction. Although the function of being able to exert a strong resistance against the resistance is lowered, as described in claim 3, by setting the range in which the bus bars of the individual column portions are convex outward of the bottle, Strength can be maintained.

  According to a fourth aspect of the present invention, in the invention of the first, second or third aspect, circumferential grooves are formed in the upper end portion and the lower end portion of the body portion, and the substantially entire height range between the upper and lower circumferential grooves is formed. Forming 6 to 8 inclined panels.

  The said structure of Claim 4 is related with the shape of a more specific trunk | drum, and does not impair the external appearance as a round bottle by forming 6-8 pieces of inclination panels, and is the abbreviation of a trunk | drum. Since the inclined panel is formed over the entire height range, a sufficiently large vacuum absorbing function can be exhibited.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the present invention, the barrel diameter is reduced from the upper end and lower end positions toward the center height position, so that the bulging deformation of the body portion in the vicinity of the center height position is effective. It is possible to suppress the bulging deformation of the entire body portion within an allowable range, and it can be used with confidence in the pressurizing and filling process of the high-temperature content liquid.

  In addition, when the bottle is in a decompressed state, the depressed volume-reducing deformation in the inclined panel can be smoothly advanced in the vertical direction starting from the vicinity of the central height position where the trunk diameter is small. Thus, it is possible to suppress the local buckling deformation of the body wall without significantly deteriorating the appearance.

  In the invention according to claim 2, the reduced diameter aspect of the body diameter is defined by the reduced diameter aspect of the column portion which is the main structural element against the action of force, and the bulging shape in the pressurized state is defined. Deformation can be suppressed more reliably.

  In the invention according to claim 3, the limit of the degree of diameter reduction of the column part is defined, and the degree of diameter reduction is set to a range in which the bus bar of each column part is convex outside the bottle. Thus, the strength of the column portion can be maintained.

  In the invention according to claim 4, by forming 6 to 8 inclined panels, the inclined panel is formed over substantially the entire height range of the body without impairing the appearance of the round bottle. Therefore, a sufficiently large reduced pressure absorption function can be exhibited.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 3 show one embodiment of a synthetic resin round bottle of the present invention, FIG. 1 is an overall front view of the bottle, and FIG. 2 is a cross-sectional view along line AA in FIG. FIG. 3 is a developed view of the vicinity of three adjacent inclined panels 12.

  The round bottle 1 of the present embodiment is a biaxial stretch blow molded product made of PET resin and has a nominal capacity of 500 ml. A cylindrical body 4 is connected to the upper end of the body 4 via a substantially hemispherical arc wall-shaped shoulder 3 with a thread and a neck ring on the outer peripheral surface. The bottom tube part 2 and the bottom part 5 are provided at the lower end of the body part 4 and are continuously provided with the center part of the bottom wall recessed into the bottle.

  Further, a circumferential groove 17 that functions as a peripheral rib is formed at the upper end and lower end of the body 4, and a short cylindrical shape is formed directly below the upper circumferential groove 17 and directly above the lower circumferential groove 17. The eight inclined panels 12 are formed in parallel in the circumferential direction so as to be inclined to the right so as to be surrounded by the stepped portion 10 while leaving the annular portion 18. In addition, eight column portions 11 that are similarly inclined upward are left between the adjacent inclined panels 12.

In this embodiment, the corners of the inclined panel 12 are rounded to form an arc, and the entire upper end and lower end are formed in an arc. Further, by making the corner portions arc-shaped, the width is wide at the upper base end portion and the lower base end portion of the column portion 11.
Note that the upper end and the lower end of the column part 11 are connected to the annular part 18 via the rising horizontal step part 14, and volume reduction deformation of the inclined panel 12 and the column part 11 in the reduced pressure state is a circumferential groove. No progress to 17.

  FIG. 2 is a cross-sectional plan view along the line AA in FIG. 1. In addition, in the cross-sectional view at the upper end 11u, the lower end 11b, and the central height position 11m (see FIG. 3) of the column portion 11, Virtual circles Ku, Kb, and Km circumscribing the bus bar 11a of the column part 11 are drawn with two-dot chain lines. (In this embodiment, the virtual circles Ku and Kb are the same circle.)

The diameters of the virtual circles Ku, Kb, and Km are Du, Db, and Dm, respectively, and the dimensions in this embodiment are in a relationship of Du = Db> Dm (Du and Db are 66.6 mm, Dm is 64.6 mm), the barrel diameter is gradually reduced from the height position corresponding to the upper end 11u and the lower end 11b of the column part 11 to the center height position 11m. (See also Du, Db, and Dm shown in FIG. 1)
Further, the diameter related to the inclined panel 12 is also reduced in accordance with the reduced diameter related to the bus bar 11 a of the column part 11.

  Then, by reducing the body diameter from the upper end 11u and the lower end 11b of the column part 11 toward the center height position 11m in this way, the inside of the bottle 1 is in a pressurized state, for example, in the pressure filling process of the content liquid. In this case, it is possible to effectively suppress the bulging deformation of the body portion 4 in the vicinity of the center height position 11 m, and it is possible to prevent the bottle 1 from becoming a so-called via barrel shape.

  And since the circumferential groove 17 and the short cylindrical annular part 18 are arrange | positioned at the upper end part and lower end part of the trunk | drum 4, the upper end part and lower end part of the trunk | drum 4 are originally bulging deformation. As described above, the bulging deformation of the entire body portion 4 can be suppressed within an allowable range by effectively suppressing the bulging deformation in the vicinity of the center height position 11 m. It can be used with confidence in the pressurization and filling process of the high temperature content liquid.

In addition, when the bottle 1 is in a reduced pressure state, the inclined panel 12 is mainly deformed and deformed in a depressed shape, and the reduced pressure absorption function is exhibited. Starting from the center height position near 11m where the trunk diameter is small, it can progress smoothly in the vertical direction, without greatly deteriorating the appearance in a reduced pressure state, and suppressing local buckling deformation of the trunk wall Can do.
Here, the center height position 11m does not necessarily need to be exactly the center between the upper end 11u and the lower end 11b, and can be appropriately designed in consideration of the appearance and the like.

Next, FIG. 4 is an explanatory view showing a curved state 11as of the bus bar 11a of one pillar portion 11 in a plane cross section along the line AA in FIG.
Here, FIG. 4A relates to a conventional round bottle having the inclined panel 12 and corresponds to a case where the diameter of the column part 11 is not reduced. In this case, the diameters of the virtual circles Ku, Kb, Km The dimension is Du = Db = Dm, and when viewed in plan, the curved state 11as of the bus bar 11a also coincides with these virtual circles Ku, Kb, Km, and shows a curved state convex to the outside of the bottle.

  FIG. 4B is an explanatory view corresponding to the bottle 1 of the present embodiment, and the dimensions of the diameters of the virtual circles Ku, Kb, and Km corresponding to the fact that the center height position 11 m is reduced in diameter are described above. In this way, Du = Db> Dm, but when viewed in plan, the curved state 11as of the bus bar 11a still maintains the curved state convex to the outside of the bottle and is strong against external force from the lateral direction. It is something that can demonstrate drag.

  FIG. 4C is a diagram in which the degree of diameter reduction from the state of FIG. 4B to the center height position 11 m is further increased, and the diameter Dm of the virtual circle Km is larger than that in the case of FIG. This is an example in which the curved state 11as of the bus bar 11a is linear when viewed in plan.

  Here, when the degree of diameter reduction from the state of FIG. 4C to the center height position 11m is further increased, the bus bar 11a becomes a concave curved state on the outer side of the bottle when seen in a plan view, and the inclined column portion 11 In particular, since the strength against the external force from the lateral direction is impaired, the state of FIG. 4C is an example showing a limit standard of the degree of diameter reduction of the body portion 4.

  As mentioned above, although embodiment of this invention and its effect were demonstrated about the Example, this invention is not limited to the said Example. The round bottle of the present invention is not limited to a biaxial stretch blow molded product made of PET resin, and the number of inclined panels formed is not limited to this embodiment.

  As described above, the synthetic resin round bottle of the present invention uses an inclined panel to fully exhibit a reduced pressure absorption function and suppresses bulging deformation, and pressurizes a high-temperature content liquid. It can be used with confidence in the filling process and is expected to be used in a wide range of applications as a round bottle with excellent vacuum absorption function.

It is a whole front view which shows one Example of the bottle of this invention. It is a plane sectional view shown along the AA line in FIG. FIG. 2 is a development view of the vicinity of three adjacent inclined panels in FIG. 1. It is explanatory drawing which shows the curved state of the bus line of one pillar part in the plane cross section along the AA in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Bottle 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 10; Step part 11; Column part 11a; Bus line 11as (of the pillar part); Upper end 11b; Lower end 11m (of the column); Center height position 12 (of the column); Inclined panel 14; Horizontal stepped portion 17; Circumferential groove 18; Annular portion Ku, Km, Kb; Virtual circle Du, Dm, Db ; Diameter (of virtual circle)

Claims (4)

A plurality of inclined panels (12) inclined in a certain direction over a predetermined height range of the cylindrical body (4) are surrounded by a stepped portion (10) so as to surround the depression. Formed in parallel in the direction, and the column portion (11) inclined between the adjacent inclined panels (12),
A synthetic resin round bottle configured to reduce the barrel diameter from the upper end (11u) and lower end (11b) positions of the column part (11) toward the center height position (11m). In a flat cross section, the diameter of the virtual circle circumscribing the generatrix (11a) of the column part (11) is directed from the upper end (11u) and lower end (11b) positions of the column part (11) to the center height position (11m). The synthetic resin round bottle according to claim 1, which is configured to be reduced in diameter. The synthetic resin round bottle according to claim 2, wherein the diameter of the imaginary circle is such that the bus bar (11a) of each column part (11) is convex outside the bottle. Circumferential grooves (17) are formed at the upper end and lower end of the body (4), and 6-8 inclined panels (12) are formed over substantially the entire height range between the upper and lower peripheral grooves (17). A synthetic resin round bottle according to claim 1, 2 or 3.

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