JP2008007147A - Pressure resistant bottle of synthetic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure resistant bottle of a synthetic resin, which has a pressure resistance suitable for its usage as a bottle for carbonated drink and having a rectangular shape as its fundamental shape. <P>SOLUTION: A cylindrical barrel 3 of a pressure resistant bottle 1 comprises an upper rectangular column barrel part 11, a lower rectangular column barrel part 12 and a cylindrical barrel part 13 between them. The upper rectangular column barrel part 11 and the lower rectangular column barrel part 12 have a right rectangular column shape as their fundamental shape, and their four corner portions are rounded by arcuate surfaces 32(1) to 32(4). Annular reinforcing ribs 14(1) to 14(5) are formed at a certain interval at the portions along a direction of a bottle axis 1a. The reinforcing ribs have the same diameter as that of an inscribed circle of the right rectangular column shape, and the cylindrical barrel part 13 is also set to have the same diameter as that of the inscribed circle. It is possible to provide a pressure resistance bottle of synthetic resin having a pressure resistance required for a bottle for carbonated drink even though the right rectangular column shape is applied as a fundamental shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a synthetic resin pressure-resistant bottle obtained by blow-molding a preform which is an injection-molded product of a synthetic resin and used as a container for carbonated beverages, and more particularly as a basic shape of a cylindrical body portion thereof. The present invention relates to a pressure-resistant bottle made of synthetic resin in which a polygonal column shape is adopted.

  As containers for storing liquids such as carbonated drinks, synthetic resin bottles such as PET bottles obtained by biaxial stretch blow molding of preforms are widely used. In such blow-molded bottles, the cylindrical body is biaxially stretched to be thin, and the out-of-plane rigidity is extremely low. For this reason, when a carbonated beverage or the like is filled, when the internal pressure rises due to an increase in ambient temperature or the like, the cylindrical body portion swells outward.

Various pressure-resistant bottles have been proposed in which the cylindrical body of a synthetic resin bottle is not deformed by changes in internal pressure. In general, in order to suppress deformation that does not interfere with use even if the internal pressure fluctuates, the cross-sectional shape of the cylindrical body of the bottle is made circular, and the overall shape is like an egg shape or a shell shape. It has a simple shape. In order to further improve pressure resistance, concave and convex ribs are provided in the circumferential direction on the cylindrical body portion of the bottle. Synthetic resin pressure bottles having such ribs are disclosed in Patent Documents 1 and 2.
JP 2002-205720 A JP 2005-313971 A

  In the pressure-resistant bottle made of synthetic resin, the cross section needs to be circular so as not to be deformed by the internal pressure. For this reason, a polygon such as a square could not be adopted as the shape of the pressure bottle from the viewpoint of design.

  In the manufacturing process of the synthetic resin pressure-resistant bottle, the bottle taken out from the blow molding die is carried out along a predetermined conveyance path and subjected to various post-treatments. In operations such as transporting bottles and aligning their directions, square bottles may be easier to handle than round bottles.

  In view of such a point, an object of the present invention is to propose a pressure-resistant bottle made of a synthetic resin which has a pressure resistance necessary for use as a carbonated beverage bottle and has a square shape as a basic shape.

In order to solve the above problems, the present invention provides a pressure-resistant bottle having a cylindrical body with a bottom obtained by blow molding a preform which is an injection molded product of a synthetic resin.
The cylindrical body is provided with a prismatic part,
In this prismatic part, a regular polygonal prism is adopted as a basic shape, and each corner part is defined by a convex curved surface smoothly connected to the flat side surfaces on both sides of each corner part,
In the prismatic part, annular reinforcing ribs are formed at predetermined intervals along the axial direction,
Each reinforcing rib is characterized in that it has the same diameter as the inscribed circle inscribed in the regular polygon cross section of the regular polygonal column or a diameter smaller than this.

  For example, a regular quadrangular prism can be adopted as the basic shape as the shape of the prismatic portion, and each corner portion can be defined by an arc surface.

  Further, the cylindrical body portion is configured such that the upper end side portion and the bottom side portion thereof in the axial direction are the prismatic portions, and the portion between them has the same diameter as the inscribed circle or a smaller diameter than the inscribed circle. It can be set as the shape made into the cylindrical constriction part.

  In the pressure-resistant bottle made of synthetic resin of the present invention, a regular polygonal column is adopted as the basic shape of the cylindrical body, and the regular polygonal column is formed on the cylindrical body at a predetermined interval along the axial direction. An annular reinforcing rib having the same diameter as or smaller than the inscribed circle inscribed in the polygonal cross section is formed.

  In the pressure-resistant bottle made of synthetic resin of the present invention, the flat side surfaces of the regular polygonal column adopted as the basic shape remain in the cylindrical body portion. In the manufacturing process of synthetic resin pressure-resistant bottles, the guide member is pressed against the flat side of the cylindrical body of the synthetic resin pressure-resistant bottle taken out from the blow mold, and the direction is aligned in a predetermined direction. It can be performed. Moreover, since it has a flat side surface, there is also an advantage that it is easier to hold the bottle than in the case of a circular shape.

  In addition, since an annular reinforcing rib is provided, a regular polygonal column shape can be adopted as a basic shape, and the cylindrical body can be prevented from being deformed in an out-of-plane direction due to a change in internal pressure, and used as a carbonated beverage bottle or the like. It also has the pressure resistance required in some cases.

  In addition, the regular polygonal shape is adopted as the basic shape of the cylindrical body, so the appearance design is different from the conventional pressure-resistant bottle made of synthetic resin, which has the basic shape of round shape, egg shape, and shell shape. Also equipped.

  In addition to this, if necessary, if a cylindrical constriction is formed on the cylindrical body, which has a regular polygonal column shape as the basic shape, it is a synthetic resin that has pressure resistance, is easy to hold, and has excellent design. A pressure-resistant bottle can be realized.

  Below, with reference to drawings, the example of the pressure bottle for carbonated drinks to which this invention is applied is demonstrated. The pressure-resistant PET bottle 1 of this example is obtained by biaxially stretching blow-molding a bottomed cylindrical preform that is an injection molded product of PET resin.

  FIG. 1 is a perspective view showing a pressure-resistant PET bottle for carbonated beverages of this example, and FIG. 2 is two side views and a cross-sectional view of the pressure-resistant PET bottle. Here, FIG. 2A is a side view when viewed from the direction of arrow a in FIG. 2C, and FIG. 2B is a view when viewed from the direction of arrow b in FIG. It is a side view. In FIG. 2C, the sections cut along the lines AA and BB in FIGS. 2A and 2B are displayed in an overlapping manner.

  The pressure-resistant PET bottle 1 of this example includes a cylindrical body portion 3 having a bottom portion 2, a neck portion 4 having a shape continuously narrowing upward at the upper end of the cylindrical body portion 3, and the neck portion 4. And a cylindrical mouth portion 5 that is continuous with the upper end. A male screw 5a is formed on the outer peripheral surface of the mouth part 5, and the mouth part 5 can be sealed by screwing a cap (not shown).

  The cylindrical body 3 includes an upper prismatic body 11 that is continuous with the neck 4, a lower prismatic body 12 that is continuous with the bottom 2, and a columnar body 13 that is positioned therebetween. It is configured. The upper prismatic body 11 and the lower prismatic body 12 have a cross-sectional shape indicated by reference numeral 30 in FIGS. 1 and 2C. The cross-sectional shape 30 has a regular quadrangular prism shape 31 as its basic shape, and the four corners of the arcuate surfaces 32 (1) to 32 (4) having the same curvature centered on the diagonal of the square cross section of the regular quadrangular prism shape. ). Each arcuate surface 32 (1) to 32 (4) smoothly continues to flat side surfaces 33 (1) to 33 (4) on both sides thereof.

  The upper prismatic body 11 and the lower prismatic body 12 are provided with annular, constant width reinforcing ribs 14 (1) to 14 (5) at regular intervals along the direction of the bottle axis 1a. Is formed. In this example, two reinforcing ribs 14 (1) and 14 (2) are formed on the upper prismatic body 11, and three reinforcing ribs 14 (3) to 14 (5) are formed on the lower prismatic body 12. ) Is formed.

  As can be seen from FIG. 2C, the diameters of the reinforcing ribs 14 (1) to 14 (5) are the same as the inscribed circle 34 inscribed in the regular square cross section of the regular quadrangular prism shape 31. As a result, each corner portion in the upper prismatic body 11 and the lower prismatic body 12 corresponds to the step between each arc surface 32 (1) to 32 (4) and the inscribed circle 34, Rib grooves 15 (1) to 15 (4) extending outward are formed.

  Here, the cylindrical body 13 located between the upper prismatic body 11 and the lower prismatic body 12 has the same diameter as the reinforcing ribs 14 (1) to 14 (5) in this example. It has a cylindrical shape. The bottom portion 2 is a pressure-resistant bottom portion including four bulging portions 21 that bulge downward at intervals of 90 degrees. The neck 4 that is continuous with the upper end of the upper prismatic body 11 has a regular quadrangular frustum as a basic shape, and the four ridge lines are defined by an arc surface.

  In the pressure-resistant PET bottle 1 of this example having such a shape, the cylindrical body portion 3 adopts a regular quadrangular prism shape with poor pressure resistance as a basic shape. However, the flat side surfaces 33 (1) to 33 (4) are deformed in the out-of-plane direction by the annular reinforcing ribs 14 (1) to 14 (5) formed at regular intervals along the direction of the axis 1a. Is prevented. Therefore, it is possible to obtain a pressure-resistant PET bottle having the pressure resistance required for a carbonated beverage bottle while having a regular quadrangular prism shape as a basic shape.

  In addition, the flat side surfaces 33 (1) to 33 (4) remaining between the annular reinforcing ribs 14 (1) to 14 (5) have a circular shape having a cylindrical shape, an oval shape, or a bullet shape as a basic shape. It is possible to realize a pressure-resistant bottle having an appearance design that cannot be obtained with a cross-section pressure-resistant bottle.

  Furthermore, the pressure-resistant PET bottle 1 taken out from the molding die after the biaxial stretch blow molding uses four flat side surfaces 33 (1) to 33 (4) remaining in the cylindrical body portion 3, An operation having the direction, an operation of sending out in a predetermined direction, and the like can be performed. Therefore, compared with a conventional pressure bottle having a circular cross section, an operation of aligning the direction and an operation of sending out in a predetermined direction can be performed easily and accurately.

  In addition to this, since the flat side surfaces 33 (1) to 33 (4) are provided, there is an advantage that the pressure-resistant PET bottle 1 can be easily grasped. In particular, in this example, since the cylindrical body part 3 is provided with the cylindrical body part 13, the pressure-resistant PET bottle 1 is more easily grasped.

(Other embodiments)
The above example employs a regular quadrangular prism as the basic shape of the cylindrical body. Other regular polygonal prisms can be adopted as the basic shape.

  Further, in the above example, the cylindrical body is formed in the cylindrical body, but this is omitted, and as a whole, a regular polygonal column is used as a basic shape, and an annular shape is formed at predetermined intervals in the axial direction. It can also be set as the structure in which the reinforcement rib was formed.

  Further, the annular reinforcing rib may have a diameter smaller than the inscribed circle of the regular polygon cross section. Further, the reinforcing ribs may be formed at different intervals instead of a constant interval.

  Furthermore, each corner portion of the regular polygonal column can be defined by a convex curved surface other than the arc surface.

  Further, the above example relates to a pressure-resistant bottle made of PET resin, but it goes without saying that the present invention can be similarly applied to pressure-resistant bottles using other thermoplastic synthetic resins.

It is a perspective view of the pressure | voltage resistant PET bottle to which this invention is applied. (A) And (b) is a side view of the pressure | voltage resistant PET bottle of FIG. 1, (c) is the sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure | voltage resistant PET bottle 1a Bottle axis 2 Bottom part 3 Cylindrical trunk | drum 4 Neck part 5 Mouth part 11 Upper prismatic trunk | drum 12 Lower prismatic trunk | drum 13 Cylindrical trunk | drum 14 (1) -14 (5) Ring-shaped reinforcement Ribs 15 (1) to 15 (4) Rib groove 31 Regular quadrangular prism shapes 32 (1) to 32 (4) Arc surfaces 33 (1) to 33 (4) Flat side surfaces

Claims (3)

In a pressure-resistant bottle comprising a cylindrical body with a bottom obtained by blow molding a preform that is an injection molded product of synthetic resin,
The cylindrical body is provided with a prismatic part,
In this prismatic part, a regular polygonal prism is adopted as a basic shape, and each corner part is defined by a convex curved surface smoothly connected to the flat side surfaces on both sides of each corner part,
In the prismatic part, annular reinforcing ribs are formed at predetermined intervals along the axial direction,
Each of the reinforcing ribs has the same diameter as an inscribed circle inscribed in the regular polygonal section of the regular polygonal column or a smaller diameter than the inscribed circle. In claim 1,
The pressure-resisting bottle made of a synthetic resin, wherein the prismatic portion is a regular quadrangular prism-shaped portion having a regular quadrangular prism as a basic shape, and four corner portions defined by arc surfaces. In claim 1 or 2,
In the cylindrical body portion, the upper end side portion and the bottom side portion thereof in the axial direction are the prismatic portions, and the portion between them has the same diameter as the inscribed circle or a diameter smaller than this. A synthetic resin pressure-resistant bottle characterized by a cylindrical constriction.

Images