Bottle

A bottomed cylindrical bottle formed of a synthetic resin material through biaxially oriented blow molding, includes a bottom portion of the bottle having a bottom wall portion, the bottom wall portion including a ground portion disposed at an outer circumferential edge portion, a rising circumferential wall portion continuously extending upward so as to be connected to the ground portion from an inside in a bottle radial direction, a movable wall portion protruding from an upper end portion of the rising circumferential wall portion toward the inside in the bottle radial direction, and a recessed circumferential wall portion having a diameter in the bottle radial direction such that the diameter gradually decreases in a direction from an inner end portion of the movable wall portion toward an upper side thereof, an annular recess depressed upward being formed at the movable wall portion in a circumferential direction thereof.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a bottle.

Priority is claimed on Japanese Patent Application No. 2011-101984, filed Apr. 28, 2011, and Japanese Patent Application No. 201.1-285153, filed Dec. 27, 2011, the contents of which are incorporated herein by reference.

Description of Related Art

Conventionally, as a bottomed cylindrical bottle formed of a synthetic resin material, a constitution that absorbs decompression in the bottle is known. The conventional bottle includes, for example, as described in the following Patent Document 1 (PCT International Publication No. WO2010/061758), a ground portion having a bottom wall portion of a bottom portion disposed at an outer circumferential edge portion, a rising circumferential wall portion extending upward so as to be connected to the ground portion from the inside in a bottle radial direction, a movable wall portion protruding from an upper end portion of the rising circumferential wall portion toward the inside of the bottle radial direction, and a recessed circumferential wall portion extending upward from an inner end portion in the bottle radial direction of the movable wall portion. A constitution in which decompression in the bottle is absorbed as the bottom wall portion pivots about a connecting portion with the rising circumferential wall portion such that the movable wall portion allows the recessed circumferential wall portion to move upward is known.

However, in the conventional bottle, there is room for improvement of decompression absorption performance.

SUMMARY OF THE INVENTION

Here, in consideration of the above-mentioned circumstances, it is an aspect of the present invention to provide a bottle capable of improving decompression absorption performance in the bottle.

In order to solve the problems, the present invention proposes the following features.

A bottle according to a first aspect of the present invention includes: a bottomed cylindrical bottle formed of a synthetic resin material through biaxially oriented blow molding, including a bottom portion of the bottle having a bottom wall portion, the bottom wall portion including: a ground portion disposed at an outer circumferential edge portion; a rising circumferential wall portion continuously extending upward so as to be connected to the ground portion from an inside in a bottle radial direction; a movable wall portion protruding from an upper end portion of the rising circumferential wall portion toward the inside in the bottle radial direction; and a recessed circumferential wall portion having a diameter in the bottle radial direction such that the diameter gradually decreases in a direction from an inner end portion of the movable wall portion toward an upper side thereof, wherein an annular recess depressed upward is formed at the movable wall portion in a circumferential direction thereof.

According to the above-mentioned features, since the annular recess is formed at the movable wall portion, in a process of forming the bottle using a preform through biaxially oriented blow molding, when the material arrives at an area in the cavity inner surface in which the annular recess is formed, the force of the flow of the synthetic resin material is weakened. Accordingly, the synthetic resin material that forms an area in the movable wall portion disposed at the outside in the bottle radial direction farther than the annular recess (hereinafter referred to as an outer sidewall portion) can extend more than the synthetic resin material that forms an area in the recessed circumferential wall portion and the movable wall portion disposed closer to the inside in the bottle radial direction than the annular recess (hereinafter referred to as an inner sidewall portion).

Accordingly, a thickness of the above-mentioned outer sidewall portion is formed to be thinner than that of the inner sidewall portion so that deformation can easily occur (the movable wall portion is easily displaced upward), and thus decompression absorption performance of the bottle can be improved.

In addition, according to the bottle of a second aspect of the present invention, in the first aspect, the movable wall portion may have a curved surface protruding downward.

In this case, upon the decompression in the bottle, the movable wall portion can be largely and easily deformed toward the inside of the bottle, and thus decompression absorption performance of the bottle can be more securely improved.

Further, according to the bottle of a third aspect of the present invention, in the first aspect, the inner end portion connected to the inner end in the bottle radial direction of the annular recess in the movable wall portion may gradually extend upward in a direction from the inside toward the outside in the bottle radial direction, and the outer end portion connected to the outer end in the bottle radial direction of the annular recess in the movable wall portion may gradually extend downward in a direction from the inside toward the outside in the bottle radial direction.

In addition, according to the bottle of a fourth aspect of the present invention, in the second aspect, the inner end portion connected to the inner end in the bottle radial direction of the annular recess in the movable wall portion may gradually extend upward in a direction from the inside toward the outside in the bottle radial direction, and the outer end portion connected to the outer end in the bottle radial direction of the annular recess in the movable wall portion may gradually extend downward in a direction from the inside toward the outside in the bottle radial direction.

In this case, since the area in the movable wall portion that connects the recessed circumferential wall portion and the annular recess gradually extends upward in a direction from the inside toward the outside in the bottle radial direction, in a process of forming the bottle as described above, when the material arrives at the area at which the annular recess of the cavity inner surface is formed, the force of a flow of the synthetic resin material can be effectively weakened.

In addition, since the area in the movable wall portion connected to the outer end in the bottle radial, direction of the annular recess gradually extends downward in a direction from the inside toward the outside in the bottle radial direction, in the process of forming the bottle as described above, after passing through the area in which the annular recess of the cavity inner surface is formed, the synthetic resin material can smoothly flow toward the outside in the bottle radial direction. Accordingly, the above-mentioned outer sidewall portion can be extended to reduce the thickness thereof.

According to the bottle of a fifth aspect of the present invention, in the first aspect, the movable wall portion may be disposed to be movable upward with the recessed circumferential wall portion around a connecting portion with the rising circumferential wall portion, and the inner portion disposed closer to the inside in the radial direction than the annular recess of the movable wall portion and the recessed circumferential wall portion may be disposed to be movable upward and around the annular recess.

According to the above-mentioned features, according to the decompression in the bottle, since the area of the movable wall portion and the recessed circumferential wall portion disposed closer to the inside in the radial direction than the annular recess (hereinafter referred to as an inner portion) can be moved upward and the bottom wall portion can be actively deformed while moving the movable wall portion upward with the recessed circumferential wall portion around the connecting portion with the rising circumferential wall portion, decompression absorption performance of the bottle can be improved.

In addition, upon the decompression in the bottle, the annular recess can be easily deformed to increase the size in the radial direction, and a sufficient upward movement amount of the recessed circumferential wall portion can be easily secured.

According to the bottle of a sixth aspect of the present invention, in the fifth aspect, a rib may be formed at the inner portion along with the circumferential direction, and the rib may be formed through biaxially oriented blow molding.

In this case, an area of the movable wall portion and the recessed circumferential wall portion disposed between the rib and the annular recess (hereinafter referred to as an intermediate portion) can be formed to have a small thickness, and the intermediate portion can be easily deformed. Accordingly, the above-mentioned inner portion of the recessed circumferential wall portion can be more easily moved upward and around the annular recess, and thus the decompression absorption performance can be securely improved.

According to the above-mentioned bottle, decompression absorption performance in the bottle can be improved.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a bottle according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

As shown inFIGS. 1 and 2, a bottle1according to the embodiment includes a mouth portion11, a shoulder portion12, a drum portion13, and a bottom portion14. The bottle1has a schematic constitution in which the components11to14are installed in sequence in a state in which central axes of the components11to14are disposed on a common axis.

Hereinafter, the above-mentioned common axis is referred to as a bottle axis O, the mouth portion11side in the bottle axis O direction is referred to as an upper side, the bottom portion14side is referred to as a lower side, a direction perpendicular to the bottle axis O is referred to as a radial direction, and a direction around the bottle axis O is referred to as a circumferential direction.

The bottle1has a constitution that a bottomed cylindrical preform formed through injection molding is integrally formed of a synthetic resin material through biaxially oriented blow molding. In addition, a cap (not shown) is mounted on the mouth portion11. Further, the mouth portion11, the shoulder portion12, the drum portion13, and the bottom portion14have a circular shape perpendicular to the bottle axis O in view of a lateral cross-sectional direction.

The shoulder portion12has a curved surface having a diameter in the radial direction such that the diameter gradually increases in the direction from the upper side to the lower side and protruding outward in the radial direction. In addition, a reinforcement groove16is formed at a lower end portion of the shoulder portion12(a connecting portion between the shoulder portion12and the drum portion13) throughout the entire circumference. The reinforcement groove16is a groove portion (a recessed rib) configured to increase the rigidity of the shoulder portion12.

The drum portion13is formed in a tubular shape, and a space between both of end portions in the bottle axis O direction has a smaller diameter than that of both of the end portions. A plurality of first annular recessed grooves15are continuously formed at the drum portion13in the bottle axis O direction at an interval throughout the entire circumference.

A second annular recessed groove20is continuously formed at the connecting portion between the drum portion13and the bottom portion14throughout the entire circumference.

The bottom portion14having a cup shape includes a heel portion17having an upper end opening mouth portion connected to a lower end opening mouth portion of the drum portion13, and a bottom wall portion19configured to close a lower end opening mouth portion of the heel portion17and in which an outer circumferential edge portion becomes a ground portion18.

A third annular recessed groove31having the same depth as the second annular recessed groove20is continuously formed at the heel portion17throughout the entire circumference.

As shown inFIGS. 2 and 3, the bottom wall portion19includes a rising circumferential wall portion21extending upward so as to be connected to the ground portion18from the inside of the bottle in the radial direction toward the upper side, an annular movable wall portion22protruding from the upper end portion of the rising circumferential wall portion21toward the inside of the bottle in the radial direction, an annular recessed circumferential wall portion23having a diameter in the radial direction such that the diameter gradually decreases with directed to upward from the inner end portion of the movable wall portion22, and a closing wall portion24configured to close the upper end opening mouth portion of the recessed circumferential wall portion23.

The movable wall portion22has a curved surface protruding downward. The movable wall portion22and the rising circumferential wall portion21are connected via a curved surface portion25protruding upward. Then, the movable wall portion22is pivotable about the curved surface portion25such that the recessed circumferential wall portion23is moved upward.

The recessed circumferential wall portion23is disposed concentrically with the bottle axis O, and continuously installed at the inner end portion in the radial direction of the movable wall portion22. Accordingly, the recessed circumferential wall portion23has a diameter in the radial direction that gradually decreases in the direction from the lower side to the upper side.

In addition, an annular recess30recessed upward is continuously formed at an inner circumferential side in the movable wall portion22throughout the entire circumference in the circumferential direction. The annular recess30is divided into an apex portion34, an outer curved wall (an outer end portion)32connected to the apex portion34from the outside in the radial direction, and an inner curved wall (an inner end portion)35connected to the apex portion34from the inside in the radial direction.

The outer curved wall32has a curved surface that gradually extends downward in the direction from the inside to the outside in the radial direction and protrudes (swells) downward. Then, the upper end portion of the outer curved wall32is connected to the outer end portion in the radial direction of the apex portion34.

Further, an inner curved wall35has a curved surface that gradually extends upward in the direction from the inside to the outside in the radial direction and protrudes downward. Then, the upper end portion of the inner curved wall35is connected to the inner end portion in the radial direction of the apex portion34.

The apex portion34of the annular recess30has a curved surface protruding upward. That is, the annular recess30has a curved surface recessed to have a size in the radial direction that gradually decreases overall in the direction from the lower side to the upper side, and the apex portion34disposed at an upper end thereof protrudes upward. In addition, the radii of curvature of the above-mentioned apex portion34, the movable wall portion22, and the curved surface portion25are formed so that the radii of curvature of the movable wall portion22is smaller than the radii of curvature of the curved surface portion25, and the radii of curvature of the curved surface portion25is smaller than the radii of curvature of the apex portion34.

The apex portion34of the annular recess30is disposed under the upper end portion of the above-mentioned curved surface portion25and over the inner curved wall35. In addition, the annular recess30is disposed over an imaginary line L extending along with a surface shape of the outer end portion in the radial direction of the outer curved wall32and the inner end portion in the radial direction of the inner curved wall35(a connecting portion with the recessed circumferential wall portion23). Further, in a shown example, the outer curved wall32and the inner curved wall35are also disposed over the imaginary line L.

In addition, a length D1in the radial direction from the curved surface portion25to the apex portion34of the annular recess30is larger than a length D2in the radial direction from the apex portion34to the outer circumferential edge of the closing wall portion24.

Here, in the bottom wall portion19of the embodiment, a thickness of a portion in the movable wall portion22disposed further outside in the radial direction than the apex portion34of the annular recess30, specifically, a portion disposed further outside in the radial direction than the outer curved wall32and the inner curved wall35(hereinafter referred to as an outer sidewall portion51), is thinner than those of the inner curved wall35of the recessed circumferential wall portion23and the movable wall portion22(hereinafter, collectively referred to as an inner sidewall portion52).

In manufacture of the above-mentioned bottle1through biaxially oriented blow molding, first, a bottomed cylindrical preform formed of a synthetic resin material is manufactured through injection molding. Then, after the preform is set in a cavity, air is blown into the preform to perform blow forming. Accordingly, as the preform is extended and expanded in both the bottle axis O direction and the radial direction, the bottomed cylindrical bottle1following the inner surface of the cavity is molded.

Here, in the bottle1of the embodiment, since the annular recess30is formed at the movable wall portion22, in a process of forming the bottle1through the biaxially oriented blow molding using the preform, a force of the flow of the synthetic resin material is weakened when the material arrives at an area in the cavity inner surface at which the annular recess30(the apex portion34) is formed. Accordingly, in comparison with the synthetic resin material that forms the inner sidewall portion52, the synthetic resin material that forms the above-mentioned outer sidewall portion51can be further extended. Accordingly, the thickness of the outer sidewall portion51is formed to be thinner than that of the inner sidewall portion52.

Then, when the inside of the bottle1manufactured as described above is decompressed, as shown inFIG. 4, first, as the outer sidewall portion51upwardly pivots about the curved surface portion25of the bottom wall portion19, the outer sidewall portion51is moved so as to raise the inner sidewall portion52upward. That is, as the bottom wall portion19of the bottle1is actively varied upon the decompression, the internal pressure variation (decompression) of the bottle1can be absorbed without deformation of the drum portion13or the like. In this case, as the connecting portion between the rising circumferential wall portion21and the movable wall portion22is formed at the curved surface portion25protruding upward, the outer sidewall portion51can be easily moved (pivoted) around the upper end portion of the rising circumferential wall portion21. For this reason, the outer sidewall portion51can be flexibly deformed according to the internal, pressure variation of the bottle1.

In particular, according to the embodiment, as the above-mentioned annular recess30is formed, when the bottle1formed of the synthetic resin material is manufactured through the biaxially oriented blow molding, the thickness of the outer sidewall portion51can be formed to be thinner than that of the inner sidewall portion52. Accordingly, the outer sidewall portion51in the bottom wall portion19can be easily deformed, and thus decompression absorption performance of the bottle1can be improved.

However, the inner curved wall35gradually extends upward in the direction from the inside to the outside in the radial direction. Accordingly, in the process of forming the bottle1as described above, the force of the flow of the synthetic resin material can be effectively weakened when the material arrives at an area in the cavity inner surface in which the apex portion34of the annular recess30is formed.

In addition, the outer curved wall32gradually extends downward in the direction from the inside to the outside in the radial direction. Accordingly, in the process of forming the bottle1as described above, after passing through the area in the cavity inner surface in which the apex portion34of the annular recess30is formed, the synthetic resin material toward the outside in the radial direction can smoothly flow. Accordingly, the above-mentioned outer sidewall portion51can extend to effectively reduce the thickness thereof.

Further, as the movable wall portion22has a curved surface protruding downward, upon the decompression in the bottle1, the movable wall portion22can be largely and easily deformed toward the inside of the bottle1. As a result, the decompression absorption performance of the bottle1can be more securely improved.

Hereinabove, while the first embodiment of the present invention has been described in detail with reference to the accompanying drawings, the specific constitution is not limited to the embodiment but may include design changes within a range not departing from the scope of the present invention.

For example, in the above-mentioned embodiment, while the case in which the annular recess30is continuously formed throughout the entire circumference in the circumferential direction has been described, the embodiment is not limited thereto. For example, the annular recess30may be intermittently formed or continuously extend throughout the entire circumference in the circumferential direction.

In addition, the plurality of annular recesses30may be formed in the radial direction at an interval.

Further, a cross-sectional shape of the annular recess30may be appropriately design-changed into a circular shape, a rectangular shape, or the like. Furthermore, the size of the annular recess30may be varied.

In addition, in the above-mentioned embodiment, while the case in which the outer curved wall32and the inner curved wall35are disposed over the imaginary line L has been described, the embodiment is not limited thereto.

Hereinafter, a bottle according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

As shown inFIGS. 5 to 7, a bottle100according to the embodiment includes a mouth portion111, a shoulder portion112, a drum portion113, and a bottom portion114. The bottle100has a schematic constitution in which the components111to114are continuously installed in sequence in a state in which central axes of the components111to114are disposed on a common axis.

Hereinafter, the above-mentioned common axis is referred to as a bottle axis O, the mouth portion111side in the bottle axis O direction is referred to as an upper side, the bottom portion114side is referred to as a lower side, a direction perpendicular to the bottle axis O is referred to as a radial direction, and a direction around the bottle axis O is referred to as a circumferential direction.

In addition, the bottle100has a constitution that a bottomed cylindrical preform formed through injection molding is integrally formed of a synthetic resin material through biaxially oriented blow molding. In addition, a cap (not shown) is mounted on the mouth portion111. Further, the mouth portion111, the shoulder portion112, the drum portion113, and the bottom portion114have a circular shape perpendicular to the bottle axis O in view of a lateral cross-sectional direction.

The shoulder portion112has a curved surface having a diameter in the radial direction such that the diameter gradually increases in the direction from the upper side to the lower side and protrudes outward in the radial direction. In addition, a plurality of (for example, two) reinforcement grooves116are formed at the shoulder portion112in the bottle axis O direction at an interval throughout the entire circumference. The reinforcement grooves116are groove portions (recessed ribs) configured to increase the rigidity of the shoulder portion112.

The drum portion113is formed in a tubular shape, and a space between both of end portions in the bottle axis O direction has a smaller diameter than either of the end portions. A plurality of first annular recessed grooves115are continuously formed at the drum portion113in the bottle axis O direction at an interval throughout the entire circumference.

A second annular recessed groove120is continuously formed at the connecting portion between the drum portion113and the bottom portion114throughout the entire circumference.

The bottom portion114having a cup shape includes a heel portion117having an upper end opening mouth portion connected to a lower end opening mouth portion of the drum portion113, and a bottom wall portion119configured to close a lower end opening mouth portion of the heel portion117and in which a bottom wall portion119becomes a ground portion118.

A third annular recessed groove131having the same depth as the second annular recessed groove120is continuously formed at the heel portion117throughout the entire circumference.

Further, in the embodiment, an uneven portion117ahaving a low protrusion height (for example, surface texturing) is formed at an outer circumferential surface of the heel portion117and an outer circumferential surface of a lower end portion of the drum portion113(seeFIG. 5). Accordingly, in a filling process, when the plurality of bottles100are continuously stood and conveyed, close contacts and non-smooth sliding between the outer circumferential surfaces of the heel portions117of the neighboring bottles100and the outer circumferential surfaces of the lower end portions of the drum portions113are suppressed, i.e., generation of blocking is suppressed. In addition, in a shown example, an uneven portion117ais also formed on a surface of the second annular recessed groove120and a surface of the third annular recessed groove131.

As shown inFIGS. 6 and 7, the bottom wall portion119includes a rising circumferential wall portion121continuously extending upward so as to be connected to the ground portion118from the inside in the radial direction, an outer movable wall portion122having a curved surface protruding downward, an annular curved portion123having a diameter in the radial direction such that the diameter gradually decreases in the direction from the inner end portion of the outer movable wall portion122to the upper side, and a closing wall portion124configured to close the upper end opening mouth portion of the curved portion123.

In addition, an annular movable wall portion127protruding from the upper end portion of the rising circumferential wall portion121toward the inside in the radial direction is constituted by the outer movable wall portion122, a lower tubular portion123aand a connecting portion123cof the curved portion123, which will be described below.

A plurality of protrusions121aprotruding toward the inside in the radial direction are formed at the rising circumferential wall portion121in the circumferential direction at an interval.

The outer movable wall portion122gradually extends downward in the direction from the outside to the inside in the radial direction. The outer movable wall portion122and the rising circumferential wall portion121are connected via a curved surface portion125protruding upward. Then, the outer movable wall portion122is pivotable about the curved surface portion125such that the curved portion123is moved upward. Further, the movable wall portion127is disposed to be movable upward with a recessed circumferential wall portion123baround a connecting portion with the rising circumferential wall portion121.

A plurality of ribs126are radially disposed at the outer movable wall portion122around the bottle axis O. That is, the respective ribs126are disposed in the circumferential direction at the same interval. In a shown example, the ribs126are formed by intermittently and straightly extending a plurality of recesses126arecessed upward in a curved surface in the radial direction. Accordingly, the ribs126have a waved shape in the bottle axis O direction in a view of a longitudinal cross-sectional direction.

The respective recesses126ahave the same shape and the same size, and are disposed in the radial direction at the same interval. Then, the plurality of ribs126are disposed at the same positions in the radial direction in which the plurality of recesses126aare disposed. In each of the ribs126, the recess126adisposed at the outermost side in the radial direction in the plurality of recesses126aapproaches the curved surface portion125from the inside in the radial direction of the curved surface portion125, and the recess126adisposed at the innermost side in the radial direction approaches the curved portion123from the outside in the radial direction of the curved portion123.

The curved portion123includes the lower tubular portion123adisposed concentrically with the bottle axis O, continuously installed at the inner end portion in the radial direction of the outer movable wall portion122, and having a diameter in the radial direction such that the diameter gradually decreases in the direction from the lower side to the upper side, the recessed circumferential wall portion123bcontinuously installed at an outer circumferential edge of the above-mentioned closing wall portion124and having a diameter in the radial direction such that the diameter gradually increases with directed to the lower side, and the connecting portion123cconfigured to connect the lower tubular portion123aand the recessed circumferential wall portion123b.

The connecting portion123chas a curved surface protruding downward.

In addition, an annular rib137depressed upward in a curved surface is formed at an inner circumferential side of the connecting portion123c(a connecting portion with the recessed circumferential wall portion123b) throughout the entire circumference in the circumferential direction.

Here, an annular recess130depressed upward is formed at the connecting portion to the lower tubular portion123aand the connecting portion123c, which are the movable wall portion127throughout the entire circumference in the circumferential direction.

The lower tubular portion123ahas a curved surface protruding (swelling) downward.

An apex wall134of the annular recess130has a curved surface protruding upward. That is, a depressed curved surface having a size in the radial direction that gradually decreases in the direction from the lower side to the upper side as a whole and having an upper end portion protruding upward is provided. In addition, the radii of curvature of the above-mentioned lower tubular portion123aand connecting portion123care formed to be smaller than that of the above-mentioned outer movable wall portion122. Further, an inner portion disposed closer to the inside in the radial direction than the annular recess130in the movable wall portion127and the recessed circumferential wall portion123bis disposed to be movable upward and around the annular recess130.

The apex wall134of the annular recess130is disposed under the upper end portion of the above-mentioned curved surface portion125and over the connecting portion123c. In addition, the annular recess130is disposed over the imaginary line L extending along with surface shapes of the outer end portion in the radial direction of the lower tubular portion123a(the connecting portion with the outer movable wall portion122) and the inner end portion in the radial direction of the connecting portion123c(the connecting portion with the recessed circumferential wall portion123b). Further, in an illustrated example, the connecting portion123cis also disposed over the imaginary line L.

In addition, the length D1in the radial direction from the curved surface portion125to the apex wall134of the annular recess130is larger than the length D2in the radial direction from the apex wall134to the outer circumferential edge of the closing wall portion124.

When the inside of the bottle100configured as described above is decompressed, first, as shown inFIG. 8, the movable wall portion127upwardly pivots about the curved surface portion125of the bottom wall portion119. Accordingly, the movable wall portion127is moved so as to raise the recessed circumferential wall portion123band the closing wall portion124upward. That is, as the bottom wall portion119of the bottle100is actively deformed upon the decompression, internal pressure variation (decompression) of the bottle100can be absorbed without deformation of the drum portion113or the like. In this case, as the connecting portion between the rising circumferential wall portion121and the movable wall portion127is formed at the curved surface portion125protruding upward, the movable wall portion127can be easily moved (pivoted) around the upper end portion of the rising circumferential wall portion121. For this reason, the movable wall portion127can be flexibly deformed according to the internal pressure variation of the bottle100.

After that, when the inside of the bottle100is further decompressed, as shown inFIG. 9, as the area disposed closer to the inside in the radial direction than the annular recess130(the connecting portion123cand the recessed circumferential wall portion123b), i.e., the inner portion of the curved portion123, upwardly pivots about the annular recess130of the movable wall portion127, the closing wall portion124is further moved to be raised upward (seeFIG. 10).

Accordingly, according to the embodiment, the outer movable wall portion122can move the inner portion of the curved portion123upward while moving the curved portion123and the closing wall portion124upward and around the curved surface portion125according to the decompression in the bottle100. That is, the bottom wall portion119can be raised inward in the bottle1in a multi-stage shape. Accordingly, since the bottom wall portion119can be actively deformed, the decompression absorption performance of the bottle100can be improved.

In addition, upon the decompression in the bottle100, the annular recess130can be easily deformed while increasing the size in the radial direction, and a sufficient upward movement amount of the curved portion123can be easily secured.

Further, the rib137is formed in the circumferential direction at the inner portion disposed closer to the inside in the radial direction than the annular recess130in the movable wall portion127and the recessed circumferential wall portion123b. The rib137is formed at the connecting portion123cto be depressed upward in a curved surface shape. As a result, when the bottle100is formed through biaxially oriented blow molding like the embodiment, a thickness of an intermediate portion disposed between the rib137and the annular recess130in the curved portion123can be formed to be reduced, and the intermediate portion can be easily deformed. Accordingly, the above-mentioned inner portion of the curved portion123can be easily further moved upward and around the annular recess130, and thus the decompression absorption performance can be securely improved.

Hereinabove, while the second embodiment of the present invention has been described in detail with reference to the accompanying drawings, a specific constitution is not limited to the embodiment and includes design changes within a range not departing from the scope of the present invention.

For example, in the above-mentioned embodiment, while the case in which the annular recess130and the rib137are continuously formed throughout the entire circumference in the circumferential direction has been described., they are not limited thereto but may be intermittently formed throughout the entire circumference in the circumferential direction.

In addition, the plurality of annular recesses130and the plurality of ribs137may be formed in radial directions at intervals.

Further, cross-sectional shapes of the annular recess130and the rib137may be appropriately design-changed into a circular shape, a rectangular shape, or the like. Furthermore, the sizes of the annular recess130and the rib137may be varied.

In addition, in the above-mentioned embodiment, while the case in which pivotal movement about the curved surface portion125and pivotal movement about the annular recess130upon the decompression of the bottle100are sequentially performed has been described, the embodiment is not limited thereto but the pivotal movement about the curved surface portion125and the pivotal movement about the annular recess130may be performed in a reversed sequence or both of the pivotal movements may be simultaneously performed.

In addition, the rising circumferential wall portion121may be appropriately modified, for example, may extend parallel to the bottle axis O direction or may extend to be inclined with respect to the bottle axis O.

Further, the movable wall portion127may be appropriately modified, for example, may protrude parallel to the radial direction, or the like.

Furthermore, the uneven portion117amay not be formed.

In addition, the synthetic resin material that forms the bottles1and100may be appropriately changed with, for example, polyethylene terephthalate, polyethylene naphthalate, non-crystalline polyester, or the like, or a blend material thereof.

Further, the bottles1and100are not limited to a single layer structure but may have a stacked-layer structure having an intermediate layer. As the intermediate layer, for example, a layer formed of a resin material having gas barrier characteristics, a layer formed of a recycled material, a layer formed of a resin material having an oxygen absorption property, or the like, may be used.

Furthermore, in the above-mentioned embodiment, while lateral cross-sectional shapes perpendicular to the bottle axes O of the shoulder portions12and112, the drum portions13and113and the bottom portions14and114have circular shapes, the shapes are not limited thereto but may be appropriately modified into polygonal shapes.

In addition, the components in the above-mentioned embodiments can be appropriately substituted with known components without departing from the scope of the present invention, and the above-mentioned variants may be appropriately combined.

According to the above-mentioned bottle, decompression absorption performance in the bottle can be improved.