JP2013006630A - Pressure resistant bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure resistant bottle that has a strengthened bottom part to reduce a deformation thereof when the inside of the bottle is brought into a positive pressure state, and that is efficiently produced and excellent in appearance.SOLUTION: The pressure resistant bottle 10 includes a neck part 11, a barrel part 12 formed downward the neck part 11 and the bottom part 20 formed downward the barrel part 12. The bottom part 20 includes an annular grounding part 21, a bottom inside surface 22 formed inside the grounding part 21 and a bottom outside surface 23 formed outside the grounding part 21. A plurality of reinforcement grooves 24 recessed inward are formed in the bottom inside surface 22 without extending on a side of the bottom outside surface 23.

Description

  The present invention relates to a pressure-resistant bottle made of, for example, polyethylene terephthalate, which is used with a positive pressure inside, and in particular, has a high strength even when the thickness of the bottle is reduced, has high production efficiency, and is aesthetically pleasing. Relates to a pressure-resistant bottle.

  When manufacturing a plastic bottle beverage, there is a technique in which a bottle is first filled with a content liquid, and then an inert gas such as nitrogen is filled into the bottle and the bottle is closed. This prevents the content liquid (for example, green tea) filled in the bottle from being oxidized and prevents the bottle from being deformed under reduced pressure. At this time, the inside of the bottle is maintained at a positive pressure (for example, 20 to 40 kPa) by the filled inert gas.

  In addition, when natural foaming water (sparkling water) or oxygen water is filled in a plastic bottle, the inside of the bottle is slightly positive. Alternatively, when the bottle is filled with a content liquid such as coffee and the bottle is heated, the inside of the bottle becomes positive pressure due to the thermal expansion of the content liquid and the internal air.

  In this way, when the inside of the bottle has a positive pressure, when the bottle 100 having the bottom 101 having a general shape as shown in FIG. 22 is used, the bottom 101 is inflated due to the inside of the bottle 100 becoming a positive pressure. The total height of 100 becomes high. Or the unevenness | corrugation of the bottom part 101 will be reversed (buckling), and the bottle 100 will not stand upright.

  In recent years, it has been desired to reduce the weight of the bottle by reducing the plastic material used in the plastic bottle, and the thickness of the bottle tends to be gradually reduced. When the thickness of the bottle is reduced, the strength of the bottom of the bottle is lowered, and there is also a problem that the bottom tends to dent when hit.

For example, as shown in FIG. 23, there is a bottle 100 having a bottom portion 101 in which a groove 102 is formed. In FIG. 23, the groove 102 extends to the bottom outer surface 103 side. The bottles shown in Japanese Patent Publication No. 3-39897 and Japanese Patent Application Laid-Open No. 2004-123103 are characterized in that a groove (rib) is provided from the bottom of the bottle to the lower part of the body.
Japanese Patent Publication No. 3-39897 JP 2004-123103 A

  A mold 120 for manufacturing the bottle 100 shown in FIG. 22 is shown in FIG. In FIG. 24, the mold 120 includes a bottom mold 121 and a pair of trunk molds 122 a and 122 b that mold the trunk of the bottle 100. In this case, since no groove is formed in the bottom outer surface 103, the bottom inner surface 104 is molded by the bottom mold 121, and the bottom outer surface 103 is molded by the pair of body molds 122a and 122b. . Therefore, when molding bottles having different barrel designs, it is only necessary to replace the pair of barrel molds 122a and 122b, and the same bottom mold 121 can be used.

  On the other hand, when the bottle 100 in which the groove 102 is formed in the bottom outer surface 103 as shown in FIG. 23 is molded, the mold 120 shown in FIG. 25 is used. In FIG. 25, both the bottom inner side surface 104 and the bottom outer side surface 103 are formed by the bottom mold 121. In this case, when molding bottles having different body designs (for example, cross-sectional shapes), it is necessary to replace not only the body molds 122a and 122b but also the bottom mold 121. For this reason, there is a problem that the investment amount of the mold becomes large, and the time for exchanging the mold in the blow molding factory becomes long, so that the operation efficiency of the factory deteriorates.

  Further, the bottle 100 shown in FIG. 23 has a problem that the design of the bottle 100 is restricted and the appearance is inferior because the groove 102 can be seen from the side surface direction of the trunk portion in a state where the bottle 100 is erected.

  The present invention has been made in consideration of such points, and by increasing the strength of the bottom portion, deformation when the inside is made positive pressure can be reduced, production efficiency is good, and aesthetics. An object is to provide an excellent pressure-resistant bottle.

  The pressure-resistant bottle includes a neck portion, a trunk portion provided below the neck portion, and a bottom portion provided below the trunk portion, and the bottom portion is provided inside the annular grounding portion and the grounding portion. It has a bottom inner surface and a bottom outer surface provided on the outer side of the grounding portion, and a plurality of reinforcing grooves to be drawn inward are formed on the bottom inner surface without extending to the bottom outer surface side. It is a pressure-resistant bottle.

  The present invention is the pressure-resistant bottle, wherein the reinforcing grooves at the bottom are arranged radially on the inner surface of the bottom.

  The present invention is a pressure-resistant bottle characterized in that a cylindrical recess is provided at the center of the inner surface of the bottom.

  The present invention is the pressure-resistant bottle characterized in that the reinforcing groove at the bottom has a substantially trapezoidal shape in a plane.

  The present invention is the pressure-resistant bottle characterized in that the cylindrical recess and each reinforcing groove are separated from each other.

  The present invention is the pressure-resistant bottle characterized in that the cylindrical recess and each reinforcing groove are connected to each other.

  In the present invention, the plurality of reinforcing grooves are composed of a relatively short short groove and a relatively long long groove. Of these, each short groove and the cylindrical recess are separated from each other, and each long groove and the cylindrical recess are Is a pressure-resistant bottle characterized by being connected to each other.

  The present invention is a pressure-resistant bottle characterized in that a spherical concave portion is provided in the center of the inner surface of the bottom portion, and the spherical concave portion and each reinforcing groove are connected to each other.

  In the present invention, the plurality of reinforcing grooves are composed of relatively short short grooves and relatively long long grooves, among which the long grooves are arranged to extend from one side of the grounding portion to the other side on the bottom inner surface, Each short groove is a pressure-resistant bottle characterized in that it is disposed along the outer periphery of the bottom inner surface.

  The present invention is the pressure resistant bottle characterized in that the body portion has a circular, polygonal, or rounded rectangular cross section.

  The present invention is a pressure-resistant bottle comprising a polyethylene terephthalate bottle formed by biaxial stretch blow molding.

  As described above, according to the present invention, the plurality of reinforcing grooves that are drawn inward are formed on the inner surface of the bottom portion without extending toward the outer surface of the bottom portion, so that the strength of the bottom portion can be increased. Therefore, it is possible to prevent the bottom portion from being deformed when the inside of the pressure-resistant bottle is set to a positive pressure. Even when pressure is applied to the bottom from the outside, deformation of the bottom can be suppressed.

  Further, according to the present invention, since the reinforcing groove does not extend to the bottom outer surface side, the reinforcing groove is not seen from the body side, and the aesthetic appearance of the pressure-resistant bottle is not impaired. Further, even when a bottle having a different body design is formed, it is only necessary to replace the body mold, and there is no need to replace the bottom mold.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a pressure-resistant bottle according to the present embodiment, and FIG. 2 is a perspective view showing a bottom portion of the pressure-resistant bottle. 3 is a view taken in the direction of arrow III in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a view showing a blow molding die for molding a pressure-resistant bottle. FIG. 6A is a conceptual diagram for explaining the buckling at the bottom (before the inside becomes a positive pressure), and FIG. 6B is a conceptual diagram for explaining the buckling at the bottom (the inside is a positive pressure). After).

  First, an outline of a pressure-resistant bottle according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the pressure-resistant bottle 10 includes a neck portion 11 having a thread portion 13 formed on the outer periphery, a body portion 12 provided below the neck portion 11, and a bottom portion 20 provided below the body portion 12. ing.

  The pressure-resistant bottle 10 is made of a polyethylene terephthalate bottle that is biaxially stretch blow molded. In addition, as a material of the pressure-resistant bottle 10, polypropylene, polylactic acid (PLA), or other various thermoplastic resins can be used in addition to polyethylene terephthalate.

  As shown in FIGS. 1 to 4, the bottom portion 20 includes an annular grounding portion 21, a bottom inner side surface 22 provided inside the grounding portion 21 and recessed inward, and an outside of the bottom portion provided outside the grounding portion 21. And a side surface 23.

  Among these, a plurality (9) of reinforcing grooves 24 that are drawn inward are formed on the bottom inner side surface 22 without extending to the bottom outer side surface 23 side. A cylindrical recess 25 is provided in the center of the bottom inner surface 22, and the cylindrical recess 25 and each reinforcing groove 24 are separated from each other.

  Each reinforcing groove 24 is formed from the boundary portion (corner portion) 31 between the grounding portion 21 and the bottom inner side surface 22 toward the central cylindrical concave portion 25, and is not formed on the bottom outer surface 23. The reinforcing grooves 24 each have a substantially trapezoidal shape that becomes wider from the center of the bottom inner side surface 22 toward the bottom outer side surface 23, and are radially arranged in the bottom inner side surface 22 along the outer periphery of the bottom inner side surface 22. Has been.

  1 to 4, the body portion 12 has a circular cross section, but is not limited thereto, and may have a cross section of a polygonal shape or a rounded rectangular shape.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, as shown in FIG. 5, the pressure-resistant bottle 10 is manufactured by biaxial stretch blow molding using a blow molding die 40. The blow molding die 40 includes a bottom mold 41 and a pair of body part molds 42 a and 42 b for forming the body part 12. A boundary 43 between the bottom mold 41 and the body molds 42 a and 42 b is located in the vicinity of the ground contact portion 21 of the bottom 20. Therefore, the bottom inner surface 22 and the reinforcing groove 24 of the bottom 20 are formed by the bottom mold 41, and the bottom outer surface 23 is formed by the pair of body molds 42a and 42b.

  Next, the pressure-resistant bottle 10 formed in this way is filled with the content liquid, and then an inert gas such as nitrogen is filled in the pressure-resistant bottle 10 and the bottle is closed. Alternatively, the pressure-resistant bottle 10 is filled with a content liquid such as natural foaming water (sparkling water) or oxygen water and closed. At this time, the inside of the pressure-resistant bottle 10 becomes a positive pressure (for example, 20 to 40 kPa) by the filled inert gas or content liquid.

  When the pressure bottle 10 has a positive pressure, pressure is applied to the bottom 20 from the inside of the pressure bottle 10 to the outside. In the present embodiment, since the reinforcing groove 24 is formed from the boundary portion 31 between the grounding portion 21 and the bottom inner side surface 22 toward the bottom inner side surface 22, the boundary portion 31 is bent and deformed. Can be prevented.

Next, an operation when the bottom portion 20 is deformed (buckling) will be described with reference to FIGS. As shown in FIGS. 6A and 6B, when the bottom portion 20 is deformed, the angle α _{1 of} the corner portion C ₁ (the boundary portion 31 described above) located between the grounding portion 21 and the bottom inner side surface 22 The angle α ₂ of the corner portion C ₂ located between the portion 21 and the bottom outer surface 23 is deformed in a direction in which the angle α ₂ increases (FIG. 6B). Deformation of the bottom portion 20 can be prevented by fixing either one (or both) of the corner portions C ₁ and C ₂ so that the angles α ₁ and α ₂ do not change. In the present embodiment, since the reinforcing groove 24 is provided, the angle of the corner portion C ₁ located between the grounding portion 21 and the bottom inner side surface 22 is kept substantially constant, so that deformation of the bottom portion 20 is prevented. can do.

  As described above, according to the present embodiment, since the plurality of reinforcing grooves 24 to be drawn inward are formed on the bottom inner side surface 22, the strength of the bottom portion 20 can be increased. Therefore, it is possible to prevent the bottom portion 20 from being deformed when the inside of the pressure-resistant bottle 10 is set to a positive pressure. Even when pressure is applied to the bottom portion 20 from the outside, deformation of the bottom portion 20 can be suppressed.

  Moreover, according to this Embodiment, since the reinforcement groove | channel 24 does not extend to the bottom part outer surface 23 side, the reinforcement groove | channel 24 is not visible from the trunk | drum 12 side, and the beauty | look of the pressure bottle 10 is impaired. There is no. Even when a bottle having a different design of the body 12 is formed, it is only necessary to replace the body molds 42a and 42b, and there is no need to replace the bottom mold 41.

(Example)
Next, specific examples in the present embodiment will be described.
First, a pressure-resistant bottle 10 (Example) shown in FIG. 1 was produced. Further, as a comparative example, a bottle 100 (Comparative Example 1) shown in FIG. 22 and a bottle 100 (Comparative Example 2) shown in FIG. 23 were produced. The difference between these three types of bottles is only the bottom shape, and the other portions (neck portion, trunk portion, etc.) have the same shape.

Next, the inside of each bottle was set to a positive pressure (20 kPa, 40 kPa), and the total amount of change in each bottle at this time was measured.

  As a result, the bottle 100 shown in FIG. 22 (Comparative Example 1) had the largest change in overall height, and the bottle 100 shown in FIG. 23 (Comparative Example 2) had the smallest change in overall height. The total amount of change in the pressure-resistant bottle 10 (Example) according to the present embodiment shown in FIG. 1 could be suppressed to approximately the same level as the bottle 100 (Comparative Example 2) shown in FIG.

Second Embodiment Next, a second embodiment of the pressure bottle according to the present invention will be described with reference to FIGS.
7 is a perspective view showing the bottom of the pressure-resistant bottle according to the present embodiment, FIG. 8 is a view taken in the direction of arrow VIII in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. is there. 10 is a perspective view showing a bottom portion of a pressure-resistant bottle according to a modification of the present embodiment, FIG. 11 is a view taken in the direction of the arrow XI in FIG. 10, and FIG. 12 is a line XII-XII in FIG. It is sectional drawing. The second embodiment shown in FIGS. 7 to 12 has a different bottom configuration, and the other configurations are substantially the same as those of the first embodiment shown in FIGS. 7 to 12, the same parts as those of the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  7 to 9, a plurality (six) of reinforcing grooves 26 to be drawn inward are formed on the bottom inner side surface 22 of the bottom portion 20 without extending to the bottom outer side surface 23 side. A cylindrical recess 25 is provided at the center of the bottom inner surface 22, and the cylindrical recess 25 and each reinforcing groove 26 are connected to each other.

  Each reinforcing groove 26 is formed between the boundary portion (corner portion) 31 between the grounding portion 21 and the bottom inner side surface 22 and the central cylindrical concave portion 25, and is not formed on the bottom outer surface 23. Each reinforcing groove 26 has a rectangular shape, and is arranged radially from the cylindrical recess 25 at the center of the bottom inner side surface 22.

Next, a modification of the present embodiment will be described with reference to FIGS.
10 to 12, the body portion 12 has a cross section having a substantially rectangular shape (rounded rectangular shape). On the other hand, the configuration of the bottom portion 20 is the same as the configuration shown in FIGS. Thus, even if the shape of the body part 12 is different, when the pressure-resistant bottle 10 is formed, only the body part mold needs to be replaced, and a common bottom mold can be used.

  As described above, according to the present embodiment, since the plurality of reinforcing grooves 26 to be drawn inward are formed on the bottom inner side surface 22, the strength of the bottom portion 20 can be increased. Therefore, it is possible to prevent the bottom portion 20 from being deformed when the inside of the pressure bottle 10 is set to a positive pressure. Further, since the reinforcing groove 26 does not extend toward the bottom outer surface 23 side, the reinforcing groove 26 is not seen from the side of the body 12 and the aesthetic appearance of the pressure-resistant bottle 10 is not impaired.

  Further, according to the present embodiment, the cylindrical recess 25 and each reinforcing groove 26 are connected to each other, so that the strength of the cylindrical recess 25 can be increased.

Third Embodiment Next, a third embodiment of the pressure bottle according to the present invention will be described with reference to FIGS.
13 is a perspective view showing the bottom of the pressure-resistant bottle according to the present embodiment, FIG. 14 is a view taken in the direction of arrow XIV in FIG. 13, and FIG. 15 is a sectional view taken along the line XV-XV in FIG. is there. The third embodiment shown in FIGS. 13 to 15 has a different bottom configuration, and the other configurations are substantially the same as those of the embodiments shown in FIGS. 13 to 15, the same parts as those of the embodiments shown in FIGS. 1 to 12 are denoted by the same reference numerals, and detailed description thereof is omitted.

  13 to 15, a plurality of (six) reinforcing grooves 27 a and 27 b that are drawn inward are formed on the bottom inner side surface 22 of the bottom portion 20 without extending to the bottom outer surface 23 side. The reinforcing grooves 27a and 27b are composed of a relatively short flat rectangular short groove 27a and a relatively long flat rectangular long groove 27b. Among these, each short groove 27a and the cylindrical recessed part 25 are mutually spaced apart, and each long groove 27b and the cylindrical recessed part 25 are mutually connected.

  According to the present embodiment, the strength of the bottom portion 20 can be increased by the plurality of reinforcing grooves 27a and 27b drawn inwardly into the bottom inner surface 22 as in the above-described embodiments.

Fourth Embodiment Next, a fourth embodiment of the pressure bottle according to the present invention will be described with reference to FIGS.
16 is a perspective view showing the bottom of the pressure-resistant bottle according to the present embodiment, FIG. 17 is a view taken in the direction of arrow XVII in FIG. 16, and FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. is there. The fourth embodiment shown in FIGS. 16 to 18 has a different bottom configuration, and the other configurations are substantially the same as those of the embodiments shown in FIGS. In FIG. 16 to FIG. 18, the same parts as those in the embodiments shown in FIG. 1 to FIG.

  16 to 18, a plurality (five) of reinforcing grooves 28 that are drawn inward are formed on the bottom inner side surface 22 of the bottom portion 20 without extending to the bottom outer side surface 23 side. Further, a spherical (dome-shaped) concave portion 29 is provided at the center of the bottom inner surface 22, and the spherical concave portion 29 and each reinforcing groove 28 are connected to each other.

  Each reinforcing groove 28 is formed between the boundary portion (corner portion) 31 between the grounding portion 21 and the bottom inner side surface 22 and the central spherical concave portion 29, and is not formed on the bottom outer surface 23. Each reinforcing groove 28 has a substantially rectangular shape on a plane, and is arranged radially along the outer periphery of the bottom inner side surface 22.

  As described above, according to the present embodiment, since the plurality of reinforcing grooves 28 to be drawn inward are formed on the bottom inner surface 22, the strength of the bottom 20 can be increased.

  Further, according to the present embodiment, since the spherical recess 29 is provided in the center of the bottom inner side surface 22, the reinforcing groove 28 is located near the center of the bottom inner side surface 22 when the pressure bottle 10 is positively pressurized. Even if it does not reach the maximum, deformation of the bottom 20 can be prevented.

  Furthermore, according to the present embodiment, since the reinforcing groove 28 does not reach the vicinity of the center of the bottom inner side surface 22, it is easy to blow-mold the bottom 20. That is, generally, during blow molding, the preform located near the center of the bottom inner side surface 22 (spherical concave portion 29) is difficult to extend, and therefore it is difficult to shape a fine shape near the center of the bottom inner side surface 22. Therefore, when the reinforcing groove 28 is provided near the center of the bottom inner side surface 22, the molding conditions during blow molding are limited. On the other hand, according to the present embodiment, since the reinforcing groove 28 is not provided near the center of the bottom inner side surface 22, the molding conditions during blow molding can be set widely.

Fifth Embodiment Next, a fifth embodiment of the pressure bottle according to the present invention will be described with reference to FIGS.
19 is a perspective view showing the bottom of the pressure-resistant bottle according to the present embodiment, FIG. 20 is a view taken in the direction of arrow XIV in FIG. 19, and FIG. 21 is a cross-sectional view taken along line XV-XV in FIG. is there. The fifth embodiment shown in FIGS. 19 to 21 is different in the configuration of the bottom, and the other configurations are substantially the same as those of the embodiments shown in FIGS. 19 to FIG. 21, the same parts as those of the embodiments shown in FIG. 1 to FIG.

  19 to 21, the body portion 12 has a cross section of a horizontally long octagonal shape. A plurality (seven) of reinforcing grooves 30 a and 30 b that are drawn inward are formed on the bottom inner side surface 22 of the bottom portion 20 without extending to the bottom outer surface 23 side. The reinforcing grooves 30a and 30b are composed of a relatively short planar rectangular short groove 30a and a relatively long planar rectangular long groove 30b. Among these, the long groove 30 b extends from the one side 21 a of the grounding portion 21 to the other side 21 b on the bottom inner side surface 22 and is disposed so as to cross the bottom inner side surface 22. On the other hand, each short groove 30a is arranged along the outer periphery of the bottom inner side surface 22, respectively.

  According to the present embodiment, the strength of the bottom portion 20 can be increased by the plurality of reinforcing grooves 30a and 30b drawn inward into the bottom inner side surface 22 as in the above-described embodiments.

The front view which shows the bottle for pressure | voltage resistant by the 1st Embodiment of this invention. The perspective view which shows the bottom part of the pressure | voltage resistant bottle by the 1st Embodiment of this invention. The bottom view which shows the bottom part of the pressure-resistant bottle by the 1st Embodiment of this invention (III direction arrow line view of FIG. 2). Sectional drawing which shows the bottom part of the pressure | voltage resistant bottle by the 1st Embodiment of this invention (IV-IV sectional view taken on the line of FIG. 3). The figure which shows the blow molding die which shape | molds the pressure | voltage resistant bottle. The conceptual diagram explaining the buckling of a bottom part. The perspective view which shows the bottom part of the pressure | voltage resistant bottle by the 2nd Embodiment of this invention. The bottom view which shows the bottom part of the pressure-resistant bottle by the 2nd Embodiment of this invention (the VIII direction arrow line view of FIG. 7). Sectional drawing which shows the bottom part of the bottle for pressure | voltage resistant by the 2nd Embodiment of this invention (the IX-IX sectional view taken on the line of FIG. 8). The perspective view which shows the bottom part of the bottle for pressure | voltage resistant by the modification of the 2nd Embodiment of this invention. The bottom view which shows the bottom part of the pressure bottle by the modification of the 2nd Embodiment of this invention (XI direction arrow line view of FIG. 10). Sectional drawing which shows the bottom part of the pressure | voltage resistant bottle by the modification of the 2nd Embodiment of this invention (XII-XII sectional view taken on the line of FIG. 11). The perspective view which shows the bottom part of the pressure | voltage resistant bottle by the 3rd Embodiment of this invention. The bottom view which shows the bottom part of the pressure bottle by the 3rd Embodiment of this invention (XIV direction arrow directional view of FIG. 13). Sectional drawing which shows the bottom part of the pressure | voltage resistant bottle by the 3rd Embodiment of this invention (XV-XV sectional view taken on the line of FIG. 14). The perspective view which shows the bottom part of the pressure | voltage resistant bottle by the 4th Embodiment of this invention. The bottom view which shows the bottom part of the pressure-resistant bottle by the 4th Embodiment of this invention (XVII direction arrow line view of FIG. 16). Sectional drawing which shows the bottom part of the pressure | voltage resistant bottle by the 4th Embodiment of this invention (XVIII-XVIII sectional view taken on the line of FIG. 17). The perspective view which shows the bottom part of the pressure | voltage resistant bottle by the 5th Embodiment of this invention. The bottom view which shows the bottom part of the pressure bottle by the 5th Embodiment of this invention (XIV direction arrow directional view of FIG. 19). Sectional drawing which shows the bottom part of the pressure | voltage resistant bottle by the 5th Embodiment of this invention (XV-XV sectional view taken on the line of FIG. 20). The perspective view which shows the bottom part of the conventional bottle. The perspective view which shows the bottom part of the conventional bottle. The figure which shows the blow molding die which shape | molds the conventional bottle. The figure which shows the blow molding die which shape | molds the conventional bottle.

DESCRIPTION OF SYMBOLS 10 Pressure-resistant bottle 11 Neck part 12 Body part 13 Screw part 20 Bottom part 21 Grounding part 22 Bottom inner side surface 23 Outer side surface 24, 26, 27a, 27b, 28, 30a, 30b Reinforcement groove 25 Cylindrical recessed part 29 Spherical recessed part 40 Blow Mold for molding

Claims (11)

In pressure-resistant bottles,
The neck,
A trunk provided below the neck,
A bottom portion provided below the trunk,
The bottom portion has an annular grounding portion, a bottom inner side surface provided inside the grounding portion, and a bottom outer surface provided outside the grounding portion,
A pressure-resistant bottle, wherein a plurality of reinforcing grooves that are drawn inward are formed on the inner surface of the bottom portion without extending toward the outer surface of the bottom portion.   2. The pressure-resistant bottle according to claim 1, wherein the reinforcing grooves at the bottom are arranged radially on the inner surface of the bottom.   The pressure-resistant bottle according to claim 1 or 2, wherein a cylindrical recess is provided in the center of the inner surface of the bottom.   The pressure-resistant bottle according to claim 3, wherein the reinforcing groove at the bottom has a substantially trapezoidal shape in a plane.   The pressure-resistant bottle according to claim 3, wherein the cylindrical recess and each reinforcing groove are separated from each other.   The pressure-resistant bottle according to claim 3, wherein the cylindrical recess and each reinforcing groove are connected to each other.   The plurality of reinforcing grooves are composed of relatively short short grooves and relatively long long grooves. Of these, each short groove and the cylindrical recess are separated from each other, and each long groove and the cylindrical recess are connected to each other. The pressure-resistant bottle according to claim 3, wherein   The pressure-resistant bottle according to claim 2, wherein a spherical concave portion is provided in the center of the inner surface of the bottom portion, and the spherical concave portion and each reinforcing groove are connected to each other.   The plurality of reinforcing grooves are composed of a relatively short short groove and a relatively long long groove. Of these, the long groove is disposed on the inner surface of the bottom portion so as to extend from one side of the grounding portion to the other side. The pressure-resistant bottle according to claim 1, wherein the pressure-resistant bottle is disposed along the outer periphery of the inner surface of the bottom portion.   The pressure-resistant bottle according to any one of claims 1 to 9, wherein the body portion has a circular, polygonal, or rounded rectangular cross section.   The pressure-resistant bottle according to any one of claims 1 to 10, wherein the bottle is made of a polyethylene terephthalate bottle that is biaxially stretch blow molded.

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