JP2008050036A - Method for producing a bottle filled with contents - Google Patents

Abstract

The present invention provides a method for producing a content-filled bottle that can suppress deformation of a body portion that occurs between a cooling step and a recessing step.
The contents are filled in a bottle 9 whose bottom inclined portion is in a protruding state by a filling process by a filling device 2, and the bottle 9 is sealed by a sealing process by a sealing device 3. Subsequently, the inclined part between the outer peripheral hinge part and the intermediate hinge part of the bottle 9 is inverted and recessed by the first recessing process by the first recessing device 4 so that the inside of the bottle 9 is in a pressurized state. Subsequently, the contents inside the bottle 9 are cooled by a cooling process by the cooling device 6. After that, the second recessing step is performed by the second recessing device 7 on the inclined portion between the intermediate hinge portion and the inner peripheral hinge portion that is in a protruding state of the bottle 9 that has been cooled and the inside is in a decompressed state. To invert the bottle 9 inward. Thereby, the decompression state inside the bottle 9 is eliminated and the deformation of the bottle 9 is prevented.
[Selection] Figure 1

Description

  The present invention relates to a method for producing a content-filled bottle in which a liquid content is sealed inside a synthetic resin bottle.

  Conventionally, for example, a polyethylene terephthalate blow-molded bottle (PET bottle) is known as a synthetic resin bottle containing beverages or the like.

  When producing a bottle filled with liquid content in this type of bottle, first, a filling process (generally filling a beverage heated to a high temperature (for example, about 85 ° C.) for heat sterilization) This is referred to as hot filling), followed by a sealing step for sealing the mouth with a cap, and then a cooling step for cooling the contents filled in the bottle. According to this, the inside of a bottle will be in a pressure-reduced state with the volume reduction | decrease of the drink by a cooling process, and the trunk | drum of a bottle deform | transforms from this influence, and is unpreferable on an external appearance.

  Therefore, the bottom of the bottle is provided with an inclined part that can be partly inverted, and the contents are filled with the inclined part protruding outward from the bottom when manufacturing the content filling bottle. After performing the process, sealing the bottle mouth part with the cap by the sealing process, performing the cooling process of the contents, and performing the indentation process to indent the inclined part of the bottom part into the inside of the bottle Is known (see Patent Document 1).

As a result, even if the inside of the bottle is depressurized by the cooling process and the body part is temporarily deformed in the diameter reducing direction, the inclined part is indented and pressurized inward of the bottle by the subsequent indentation process. As a result, the decompressed state inside the bottle is canceled out, and the decompression deformation of the body portion is eliminated. In this way, by providing an inclined part that can be turned upside down on the bottom of the bottle and sealing the contents, the inclined part is turned upside down. As a result, it is possible to reduce the thickness of the bottom, so that the material cost of the bottle can be reduced.
Special table 2006-501109

  However, even if the bottom portion is provided with an inclined portion that can be turned upside down, the indentation step is performed after the cooling step, so that the body portion is temporarily deformed until the indentation step is performed after the cooling step. Can't be prevented. In particular, in the case of a bottle having a relatively thin body such as a PET bottle, even if the reduced pressure deformation of the bottle is eliminated by the indentation process, the part temporarily deformed in the cooling process becomes a deformation mark. There is a risk of remaining on the torso.

  Further, in order to perform the filling operation in a state where the inclined portion of the bottom portion of the bottle is protruded outward in the filling step, the inclined portion of the bottom portion of the bottle is protruded outward until the recessed step is performed. State is maintained. For this reason, for example, in the conveyance between devices up to the device performing the indentation process such as charging and discharging at least to the device performing the cooling process, the bottle can not be independently conveyed by the conveyor, and the device configuration of the conveyance path is There is an inconvenience of complication.

  The present invention has been made in view of the above-described problems, and can suppress deformation of the body portion that occurs between the cooling process and the insertion process, and at least performs the cooling process. It is an object of the present invention to provide a method for producing a content-filled bottle that can enable the bottle to be self-supported during loading and unloading into the apparatus.

  The present invention relates to a content in which a liquid content is sealed inside a synthetic resin bottle including a mouth portion, a body portion provided continuously below the mouth portion, and a bottom portion that closes a lower portion of the body portion. The present invention relates to a method for manufacturing a product-filled bottle. In the present invention, a leg portion having a grounding surface connected to the lower end of the trunk portion at the bottom portion and a region surrounded by the leg portion and inverted toward the trunk inner portion or the trunk outer portion. An outer periphery that includes an inclined portion that is freely inclined and a bottom center portion that is surrounded by the inclined portion, and that is formed in an annular shape along the outer peripheral edge of the inclined portion, and serves as a hinge on the outer peripheral side when the inclined portion is reversed. A hinge part, an inner peripheral hinge part formed in an annular shape along the inner peripheral edge of the inclined part and serving as a hinge on the inner peripheral side when the inclined part is reversed; an outer peripheral hinge part and an inner peripheral hinge part of the inclined part; A bottle provided with an intermediate hinge portion that is annularly formed between the outer peripheral hinge portion and the inner peripheral hinge portion so as to be bendable between the outer peripheral hinge portion and the inner peripheral hinge portion.

  In order to achieve the above object, first, the present invention provides a liquid content inside the bottle in a state in which an inclined portion between the outer peripheral hinge portion and the inner peripheral hinge portion is reversely projected outward from the body portion. A filling process for filling the product is performed, and then a sealing process is performed in which the cap is fitted and sealed to the mouth of the bottle filled with the liquid content in the filling process. In the filling step, the bottle is filled with the contents heated to a high temperature (for example, about 85 ° C.) (so-called hot filling). Subsequently, the inclined portion in which the liquid content is sealed inside by the sealing step, and the portion between the outer peripheral hinge portion and the intermediate hinge portion of the inclined portion that is in the protruding state is inverted and recessed inward of the bottle. The inclined portion between the outer hinge portion and the intermediate hinge portion is inclined upward toward the center of the trunk portion, and the inclined portion between the intermediate hinge portion and the inner peripheral hinge portion is directed toward the barrel center. A first indentation step is performed to form the bottom in a shape that is inclined downward. Next, a cooling step is performed to cool the liquid content inside the bottle in which the inclined portion between the outer hinge portion and the intermediate hinge portion is recessed by the first recess step. The inclined portion between the intermediate hinge portion and the inner peripheral hinge portion, which is in the protruding state of the bottle whose liquid content inside is cooled by the cooling step, is inverted and recessed inward of the bottle, and the outer periphery A second indentation step is performed in which the inclined portion between the hinge portion and the inner peripheral hinge portion is inclined so as to incline upward toward the center of the trunk portion.

  According to the method of the present invention, the first indentation step is performed after the sealing step. In the first recessing step, the inclined portion between the outer hinge portion and the intermediate hinge portion is inclined upward toward the center of the trunk portion, and the inclined portion between the intermediate hinge portion and the inner peripheral hinge portion is The inclined portion between the outer peripheral hinge portion and the intermediate hinge portion is inverted and recessed so as to have a shape inclined downward toward the center of the trunk portion. As a result, the inclined portion is bent through the intermediate hinge portion, and only the outer side of the intermediate hinge portion among the inclined portions that are in a protruding state is recessed inward of the trunk portion. And the volume reduction of a bottle arises by the recessed inclination part, and the inside of a bottle will be in a pressurized state (positive pressure) prior to the cooling process performed subsequently. In addition, at this time, since the volume reduction of the bottle is small as compared with the case where the entire inclined portion between the outer peripheral hinge portion and the inner peripheral hinge portion is recessed, the body portion does not significantly bulge and deform.

  And a cooling process is performed after performing a 1st indentation process. In the cooling step, the liquid content inside the bottle is cooled, and the pressure in the bottle is remarkably reduced as the volume of the content decreases. However, the volume of the bottle is appropriately reduced in advance by the first indentation step ( The pressure drop corresponding to the reason that the inside of the bottle is appropriately pressurized is offset, and the pressure drop inside the bottle can be reduced. Accordingly, extreme decompression deformation of the body portion in the cooling process can be suppressed, and deformation of the body portion can be reliably prevented by reducing the decompression deformation of the body portion.

  Thereafter, in the second recessing step, the outer peripheral hinge portion and the inner peripheral hinge portion are arranged such that the inclined portion between the outer peripheral hinge portion and the inner peripheral hinge portion is inclined upward toward the center of the trunk portion. Invert the concave part between them. Thereby, the pressure reduction state inside the bottle caused by the cooling process can be surely solved.

  Further, in the present invention, the bottom of the synthetic resin bottle is inclined when the inclined portion between the outer hinge portion and the intermediate hinge portion is inverted and recessed inward of the bottle by the first recessed step. It is preferable that the center portion and the bottom center portion are housed inwardly surrounded by the leg portion at a position above the ground contact surface of the leg portion. According to this, after performing the first indenting step, the inclined part between the outer peripheral hinge part and the inner peripheral hinge part bent through the intermediate hinge part protrudes downward from the ground plane. Therefore, it is possible to enable the bottles to be independently transported at least when they are charged into and discharged from the apparatus that performs the cooling process.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a manufacturing process of a content-filled bottle in the present embodiment, FIG. 2 is a cross-sectional explanatory view of a bottle adopted in the present embodiment, and FIG. 3 is an enlarged cross-sectional view showing the bottom of the bottle in FIG. 4 and FIG. 4 are explanatory views showing a first recessing step of the present embodiment, and FIG. 5 is an explanatory view showing a second recessing step of the present embodiment.

  As shown in FIG. 1, the production line for content-filled bottles in this embodiment includes a cleaning device 1 that performs a cleaning process, a filling device 2 that performs a filling process, and a sealing device 3 that performs a sealing process in order from the upstream side. The first indentation device 4 for performing the first indentation step, the sterilization device 5 for performing the sterilization step, the cooling device 6 for performing the cooling step, and the second indentation device 7 for performing the second indentation step are provided. . A conveyance path 8 is provided between the apparatuses, and a synthetic resin bottle 9 (see FIG. 2), which will be described later, is conveyed along the conveyance path 8.

  Here, first, the bottle 9 employed in the present embodiment will be described. As shown in FIG. 2, the bottle 9 is made of polyethylene terephthalate resin (PET) that is blow-molded and heat-set to impart heat resistance if desired. A cylindrical body portion 12 is provided continuously below the shoulder portion 11 via a shoulder portion 11, and a bottom portion 13 that closes a lower portion of the body portion 12. A screwing portion 15 for screwing a cap 14 (shown in phantom lines in FIG. 2) is formed on the outer periphery of the mouth portion 10.

  As shown in FIGS. 2 and 3, the bottom portion 13 of the bottle 9 includes an annular leg portion 16 formed continuously at the lower end of the body portion 12, and an inclination formed in a region surrounded by the leg portion 16. A portion 17 and an inward projecting portion 18 (bottom center portion) formed at the center portion of the bottom portion 13 are provided. The leg portion 16 has a curved shape so as to protrude downward from the body portion 12, and is provided with a grounding surface 19 at the lower end thereof for grounding when the bottle 9 is self-supporting.

  An outer peripheral hinge portion 20 is formed on the outer peripheral edge of the inclined portion 17 (boundary with the inner peripheral edge of the leg portion 16). Further, an inner peripheral hinge portion 21 is formed on the inner peripheral edge of the inclined portion 17 (boundary with the outer peripheral edge of the inward protruding portion 9). Further, an intermediate hinge portion 22 is formed between the outer peripheral hinge portion 20 and the inner peripheral hinge portion 21. The inclined portion 17 includes a first reversing portion 23 that is reversibly inclined between the outer hinge portion 20 and the intermediate hinge portion 22, and a first reversing portion that is reversibly inclined between the intermediate hinge portion 22 and the inner peripheral hinge portion 21. And 2 reversing unit 24.

  The inner peripheral hinge portion 21 is formed thinner than the inclined portion 17. The outer peripheral hinge portion 20 and the intermediate hinge portion 22 are formed thinner than the inclined portion 17 and have a curved shape in sectional view that is recessed inward of the bottle 9. Accordingly, the outer hinge portion 20, the intermediate hinge portion 22, and the inner hinge portion 21 have a high bending strength with respect to the reversing operation of the first reversing portion 23 and the second reversing portion 24 while ensuring the ease of bending as a hinge. It has gained.

  The inward projecting portion 18 rises from the inner peripheral hinge portion 21 toward the axis of the trunk portion 12 and projects into the trunk portion 12 (indented when viewed from the outside), and has a substantially conical shape with a substantially flat top portion. Is formed. The center of the top portion of the inward projecting portion 18 substantially coincides with the axis of the bottle 9 (that is, the center of the bottom portion 13). The inward projecting portion 18 is formed in an appropriate size according to the outer diameter of the bottom portion 13.

  Further, as shown in FIG. 3, the bottom portion 13 of the bottle 9 bends the inclined portion 17 via the intermediate hinge portion 22, so that the first reversing portion 23 is inclined upward toward the center of the trunk portion 3, In addition, the second reversing portion 24 is inclined downward toward the center of the body portion 12 so that only the second reversing portion 24 can be projected outward. Further, at this time, even if the second reversing portion 24 protrudes outward, the second reversing portion 24 is located above the ground contact surface 19 of the leg portion 16 and is surrounded by the leg portion 16. It is designed to be stored in. Further, the bottom portion 13 can be in a protruding state in which both the first reversing portion 23 and the second reversing portion 24 are inclined downward toward the center of the body portion 12. At this time, the second reversing portion 24 protrudes below the ground contact surface 19 of the leg portion 16.

  More specifically, when both the first reversing portion 23 and the second reversing portion 24 are inclined downward, the intermediate hinge portion 22 is provided so as to be located within a range a from the ground surface 19 to the outer peripheral hinge portion 20. ing. And the position of the intermediate hinge part 22 in the inclination part 17 is the moving distance b of the intermediate hinge part 22 when the 1st inversion part 23 inverts via the outer periphery hinge part 20, and the 1st inversion part 23 and the 2nd inversion. When both the parts 24 are inclined downward, the relationship with the projecting amount c of the second reversing part 24 projecting downward from the ground contact surface 19 is set such that b ≧ c.

  The bottle 9 employed in the present embodiment has a shape in which the state where both the first reversing part 23 and the second reversing part 24 are recessed is a product as a content filling bottle, and its capacity (liquid content to be filled) The amount of the product is 500 ml. And in the state where both the 1st inversion part 23 and the 2nd inversion part 24 protrude, it will be in the state (substantially maximum volume) which the volume of the bottle 9 increased about 25 milliliters, From this state, the 2nd inversion part 24 If only the first reversing part 23 is recessed inward in a state of protruding outward, the volume is reduced by about 10 milliliters from the substantially maximum volume.

  In addition, the bottle 9 employ | adopted by this embodiment is set so that the 1st inversion part 23 and the 2nd inversion part 24 may invert separately through the outer periphery hinge part 20, the intermediate hinge part 22, and the inner periphery hinge part 21, respectively. However, the first reversing portion 23 and the second reversing portion 24 are formed so that the surface shape of the inclined portion 17 and the inclined portion 17 do not inadvertently reverse in the return direction after being recessed or protruded in each. The inclination angle and the size of the inclined portion 17 are appropriately set.

  Next, the manufacturing method of the content filling bottle in this embodiment is demonstrated. With reference to FIG. 1, the bottle 9 is first put into the cleaning device 1 to perform internal and external cleaning. Next, the washed bottle 9 conveyed to the filling device 2 is filled with a beverage (liquid content) heated to about 85 to 87 ° C. (filling step). In addition, the bottle 9 conveyed to the filling device 2 is formed such that the first reversing portion 23 and the second reversing portion 24 of the bottom portion 13 protrude outward.

  Subsequently, the bottle 9 filled with the beverage is put into the sealing device 3, and the cap 14 is screwed onto the mouth 10 of the bottle 9. As a result, the beverage is sealed inside the bottle 9 with the first reversing portion 23 and the second reversing portion 24 of the bottom portion 13 protruding outward (sealing step). Thereafter, the bottle 9 carried out from the sealing device 3 is put into the first indenting device 4.

  In the first indenting device 4, the first inversion part 23 of the bottle 9 is inversion recessed (first indenting step). That is, first, as shown in FIG. 4A, the bottle 9 carried out from the sealing device 3 is held by the bottle charging turret 25 and charged. Since the bottle insertion turret 25 conveys the bottle 9 in an arc shape by its rotation, the bottle insertion turret 25 includes a regulating plate 26 for preventing the bottle 9 from being detached during the conveyance. Next, as shown in FIG. 4B, the bottle 9 is delivered to the bottle chuck 27 that holds the shoulder portion 11 of the bottle 9. After the delivery of the bottle 9 is completed, as shown in FIG. 4C, the bottle support table 28 on which the bottle 9 is placed and supported rises, and the bottle 9 is placed on the bottle support table 28. As a result, the bottle 9 is sandwiched between the bottle chuck 27 and the bottle support table 28 from above and below, and is positioned so as not to move up. The bottom of the bottle support table 28 corresponding to the bottom 13 of the bottle 9 is opened.

  Then, while maintaining this positioning state, as shown in FIG. 4 (d), the first activator punch 29 is raised, and the intermediate hinge portion between the first inversion portion 23 and the second inversion portion 24 in the protruding state Push 22 up. As a result, the intermediate hinge portion 22 is bent inward, and only the first inversion portion 23 is inverted and recessed. At this time, the first activator punch 29 has a shape that substantially corresponds to the protruding shape of the second reversing portion 24 at its tip, and the second activator punch 29 is pushed up by the tip of the first activator punch 29 so that the second Only the 1st inversion part 23 which is a part of the inclination part 17 is dented, maintaining the protrusion of the inversion part 24. FIG.

  Thereafter, although not shown, the first activator punch 29 is lowered below the bottle support table 28, and the bottle support table 28 is lowered and separated from the bottle 9 to be held by the bottle chuck 27. And the holding | maintenance by the bottle chuck | zipper 27 is cancelled | released, and the bottle 9 is delivered to the bottle discharge | emission turret etc. which are not shown in figure, and also is discharged and conveyed by the discharge conveyor etc. At this time, since the bottle 9 is not protruded downward from the ground contact surface 19 of the leg portion 16 because only the first reversing portion 23 is recessed, the bottle 9 can be carried independently. Further, in the bottle 9 in which the first reversing unit 23 is reversed and recessed in the first recessed device 4, the volume of the first reversing unit 23 that is recessed is reduced (in this embodiment, the first reversing unit 23. ), The volume of the bottle 9 is reduced by about 10 milliliters), and the interior is pressurized.

  With reference to FIG. 1, the bottle 9 discharged from the first indenting device 4 is sterilized by the sterilizing device 5 and then fed into the cooling device 6. In the cooling device 6, the temperature of the beverage filled in the bottle 9 is lowered by spraying cooling water or cooling air onto the bottle 9. In the cooling process at this time, the beverage filled in the bottle 9 is thermally contracted, and the internal pressure of the bottle 9 decreases accordingly. On the other hand, prior to the bottle 9 being put into the cooling device 6, only the first inversion portion 23 is recessed by the first indenting device 4 and the inside is in a pressurized state. As a result, even if the internal pressure of the bottle 9 decreases due to cooling, the body 12 is discharged from the cooling device 6 without any significant deformation.

  The bottle 9 discharged from the cooling device 6 is subsequently put into the second indenting device 7, and the second reversing part 24 of the bottle 9 is inversion recessed (second indenting step). The second indenting device 7 is configured in the same manner as the first indenting device 4, and only the tip shape of the second activator punch 30 is different from the first activator punch 29. Accordingly, the operation of the second indenting device 7 is substantially the same as that of the first indenting device 4. That is, first, as shown in FIG. 5A, the bottle 9 carried out from the cooling device 6 is held by the bottle charging turret 31 and charged. The bottle insertion turret 31 includes a regulation plate 32 for preventing the bottle 9 from being detached during conveyance. Next, as shown in FIG. 5B, the bottle 9 is delivered to the bottle chuck 33 that holds the shoulder 11 of the bottle 9, and the bottle 9 is placed on the bottle support table 34 as shown in FIG. Is placed.

  Then, as shown in FIG. 5 (d), the second activator punch 30 is raised, and the protruding second reversing portion 24 is pushed up to be reversibly recessed. At this time, the second activator punch 30 has a shape substantially corresponding to the inward projecting portion 18 at its tip, and the second inversion portion 24 is pushed up by pushing the inward projecting portion 18 by the tip of the second activator punch 30. Is inverted and recessed. Accordingly, the bent state of the intermediate hinge portion 22 is released, and the body portion 12 extends from the first reversing portion 23 to the second reversing portion 24 that is the entire inclined portion 17 between the outer peripheral hinge portion 20 and the inner peripheral hinge portion 21. It is in a state of being recessed inward. And since the inclination part 17 from the 1st inversion part 23 to the 2nd inversion part 24 was in the indented state, the part | minute volume further reduced, and the decompression state inside the bottle 9 is canceled in connection with it. Therefore, the decompression deformation of the trunk portion 12 can be reliably prevented.

  Thereafter, although not shown, the second activator punch 30 is lowered below the bottle support table 34, the bottle support table 34 is lowered and separated from the bottle 9, and is held by the bottle chuck 33. The bottle 9 is transferred to a bottle discharge turret (not shown) after being released, and further discharged and conveyed by a discharge conveyor or the like.

  As described above, in the present embodiment, only the first reversing portion 23 is maintained while the protrusion of the second reversing portion 24 to the outside of the body portion 12 is maintained by the first recessed step in the first recessed portion 4. Since the reversal recess is made, the decrease in the internal pressure of the bottle 9 cooled by the cooling process in the cooling device 6 can be moderated moderately, and the reduced pressure state inside the bottle 9 can be reduced by the second recessing process in the second recessing device 7. The decompression deformation of the body portion 12 until it is canceled can be reduced. Moreover, since the bottle 9 discharged from the first indenting device 4 can be self-supported by indenting only the first reversing unit 23, for example, the conveying path between the devices after the first indenting device 4 8, a conveyor or the like can be employed, and it is possible to prevent the configuration of the transport device of the production line from becoming complicated.

The block diagram which shows the manufacturing process of the content filling bottle in one Embodiment of this invention. Cross-sectional explanatory drawing of the bottle employ | adopted in this embodiment. Cross-sectional explanatory drawing which expands and shows the bottom part of the bottle of FIG. Explanatory drawing which shows the 1st indentation process of this embodiment. Explanatory drawing which shows the 2nd indentation process of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 9 ... Plastic resin bottle, 10 ... Mouth part, 12 ... Trunk part, 13 ... Bottom part, 16 ... Leg part, 17 ... Inclined part, 18 ... Inward protrusion part (bottom part center part), 19 ... Grounding surface, 20 ... Outer peripheral hinge part, 21 ... Inner peripheral hinge part, 22 ... Intermediate hinge part, 23 ... First reversing part (inclined part between outer peripheral hinge part and intermediate hinge part), 24 ... Second reversing part (with intermediate hinge part) Inclined part between inner hinge part).

Claims (2)

A content-filled bottle in which a liquid content is sealed inside a synthetic resin bottle that includes a mouth, a body continuously provided below the mouth, and a bottom that closes a lower portion of the body. In the manufacturing method,
The bottle is formed in a leg portion having a grounding surface continuously provided at a lower end of the trunk portion at the bottom portion and an area surrounded by the leg portion, and the bottle is reversible inward from the trunk portion to the outer portion of the trunk portion. And an outer peripheral hinge that is formed in an annular shape along the outer peripheral edge of the inclined portion and serves as an outer hinge when the inclined portion is reversed. An inner peripheral hinge portion that is formed annularly along the inner peripheral edge of the inclined portion and serves as an inner peripheral hinge when the inclined portion is reversed, and an outer peripheral hinge portion and an inner peripheral hinge portion of the inclined portion. An intermediate hinge portion that is formed in an annular shape so that the inclined portion can be bent between the outer peripheral hinge portion and the inner peripheral hinge portion,
A filling step of filling the liquid contents inside the bottle in a state where the inclined portion between the outer peripheral hinge portion and the inner peripheral hinge portion is inverted and protruded outward from the trunk portion; and
A sealing step of fitting and sealing a cap on the mouth of the bottle filled with the liquid content by the filling step;
Of the inclined portion in which the liquid content is sealed inside by the sealing step, the portion between the outer peripheral hinge portion and the intermediate hinge portion is inverted and recessed into the bottle, The inclined part between the hinge part and the intermediate hinge part is inclined upward toward the center of the trunk part, and the inclined part between the intermediate hinge part and the inner peripheral hinge part is inclined downward toward the trunk part center. A first indentation step of forming a bottom in a shape to
A cooling step for cooling the liquid content inside the bottle in which the inclined portion between the outer peripheral hinge portion and the intermediate hinge portion is recessed by the first recessed step;
The outer peripheral hinge part is formed by reversing and indenting the inclined part between the intermediate hinge part and the inner peripheral hinge part, which is in a protruding state of the bottle whose liquid content inside is cooled by the cooling step, into the bottle. And a second indentation step of forming a bottom portion in a shape in which the inclined portion between the inner peripheral hinge portion and the inner peripheral hinge portion is inclined upward toward the center of the body portion.   When the inclined portion between the outer hinge portion and the intermediate hinge portion is inverted and recessed inward of the bottle by the first recessing step, the inclined portion and the bottom center portion of the synthetic resin bottle are 2. The method for producing a content-filled bottle according to claim 1, wherein the bottle is stored inwardly surrounded by the leg at a position above the ground contact surface of the leg.

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