JP2017165453A - Plastic bottle and filled body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle which suppresses deformation of a bottom part and a body part when the inside is positively pressurized by heating or the like, maintains a constriction in warming, and has both industrial design and practicability, and a filled body.SOLUTION: A plastic bottle includes a mouth part 10, a shoulder part 20, a body part 30, and a bottom part 40 in series in an axial direction. The body part 30 has a constriction part 50 in which a body diameter is narrowed and both an upper side cylindrical part 60 and a lower side cylindrical part 70 in which the body diameter is maximum on both sides in the axial direction with the constriction part 50 in between. The constriction part 50 is constituted of a column 51 and a panel 52 which respectively extend in the axial direction and are alternately and continuously arranged in a circumferential direction and has a constriction circumferential part 53 which extends in the circumferential direction from a column innermost part 54 that is a position where the body diameter is minimum in the column 51 through the panel 52.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plastic bottle and a filling body, and more particularly to a plastic bottle called a so-called round bottle and a filling body.

  As containers filled with beverages, plastic bottles, especially PET (PolyEthylene Terephthalate) bottles are often used. Sales forms of products using PET bottles are also diversifying. Among them, for example, in winter, there is a PET bottled beverage made by assuming that the entire container is heated with a dedicated warmer called a hot warmer.

  In Patent Document 1, in a method for producing a beverage filling bottle for warming storage in which a beverage is sealed inside a flexible synthetic resin bottle, the beverage cooled to room temperature after being subjected to heat sterilization treatment, A beverage filling step for filling a synthetic resin bottle, and a sealing step for sealing the bottle with a cap in a state where the bottle filled with the beverage is pressed and deformed to reduce the bottle capacity by a predetermined amount. A method for producing a beverage filling bottle is disclosed.

JP 2003-212296 A

  According to the method for producing a beverage-filled bottle for warming storage in Patent Document 1, even if the beverage in the interior and the gas in the space formed in the upper part of the beverage are expanded by heating, the bottle body It is said that the portion can be prevented from bulging outward and the storage and sale in a warmed state can be favorably performed.

  However, the method according to Patent Document 1 requires a device for pressing the bottle, and thus the production cost increases. Furthermore, when a bottle is pressed and deformed, the beverage overflows from the bottle, the container is contaminated, and the possibility of poor appearance increases. Furthermore, if the pressure on the bottle is too strong, the bottle may be deformed and not returned to its original shape, resulting in poor appearance. These tendencies become more conspicuous because the lighter the plastic bottle is, the thinner it becomes and the easier it is to deform, and the control of the pressing force becomes more difficult.

  Therefore, the object of the present invention is to suppress the deformation of the bottom part and the body part even when the inside is positively pressurized by heating or the like, and the constriction is maintained even during heating, which has both design and practicality. It is in providing a plastic bottle and a filling body.

  In order to solve the above problems, the present invention provides a plastic bottle having a mouth portion, a shoulder portion, a body portion, and a bottom portion sequentially in the axial direction, wherein the body portion is a constricted portion having a reduced diameter. Cylindrical portions having the largest barrel diameters on both sides in the axial direction across the constricted portion, and the constricted portion is configured such that columns extending in the axial direction and panels are alternately connected in the circumferential direction. And a constricted circumferential portion extending through the panel in the circumferential direction from a position where the body diameter is minimum in the column.

  Furthermore, the contents of the plastic bottle are used for warming sales in a higher temperature state than at the time of filling.

  Further, the panel is characterized in that a region including at least the constricted circular portion is recessed inside the plastic bottle from a line connecting adjacent columns.

  Furthermore, the thickness of the panel is 0.15 mm or more and 0.50 mm or less.

  Furthermore, the thickness of the column is 0.15 mm or more and 0.50 mm or less.

  Further, the constricted circumferential portion is chamfered so that the axial cross section is formed in an arc shape.

  Furthermore, the panel has a concave surface portion in which the cross section in the axial direction and the circumferential direction both curves toward the inside of the plastic bottle.

  Further, the constricted circulation part is formed with a connection part that connects the adjacent columns.

  Further, the cylindrical portion is formed with a lateral rib extending in the circumferential direction.

  Furthermore, the cross section in the axial direction of the lateral rib is tapered.

  Further, the constricted circulation part is located at the axial center of the column and the panel.

  Further, the plurality of panels connected in the circumferential direction are configured to be 4 or more and 12 or less.

  Furthermore, the ratio of the trunk diameter in the constricted circulation portion of the column to the cylindrical portion is 0.83 or more and 0.95 or less.

  Furthermore, the ratio of the cylinder diameter of the panel that minimizes the cylinder diameter in the constricted circulation part with respect to the cylindrical part is 0.70 or more and 0.82 or less.

  Furthermore, the temperature of the contents is 15 ° C. or more and 40 ° C. or less at the time of filling, and 50 ° C. or more and 80 ° C. or less at a high temperature state.

  Further, the material constituting the plastic bottle is polyethylene terephthalate, and at least one of a germanium compound, a titanium compound, and an aluminum compound is used as a polymerization catalyst for the polyethylene terephthalate.

  Furthermore, the filling body according to the present invention is constituted by the plastic bottle described above and a liquid to be filled.

  According to the present invention, in the plastic bottle having the mouth portion, the shoulder portion, the trunk portion, and the bottom portion in the axial direction, the trunk portion has a constricted portion with a narrowed trunk diameter, and a shaft sandwiching the constricted portion. A cylindrical portion having the largest barrel diameter on both sides in the direction, and the constricted portion is configured such that columns extending in the axial direction and panels are alternately connected in the circumferential direction, and the barrel diameter is the smallest in the columns. Since it has a constricted circular part extending through the panel in the circumferential direction, it is possible to increase the amount of deformation especially in the radial direction, and even when the inside is positively pressurized by heating or the like, Therefore, it is possible to provide a plastic bottle having both design and practicality.

  Furthermore, since the contents of the plastic bottle are used for warming sales at a higher temperature than when filled, the ability to absorb the internal pressure of the plastic bottle and the function of maintaining the constriction even during heating are fully exhibited.

  Furthermore, according to the configuration in which the region including at least the constricted portion is recessed inward of the plastic bottle rather than the line connecting the adjacent columns, the panel has a larger amount of deformation in the radial direction, particularly outward. Plastic bottles that have both design and practicality because the bottom and torso are less deformed even when the inside is positively pressurized by heating, etc., and the constriction is maintained during heating. Can be provided.

  Furthermore, according to the configuration in which the wall thickness of the panel is 0.15 mm or more and 0.50 mm or less, the panel can be easily deformed particularly in the radial direction, and in particular, the positive pressure absorption ability can be further improved. Can do. Therefore, even when the inside is heated to a positive pressure by heating, etc., the bottom and torso parts are further prevented from deforming, and constriction is maintained during heating, providing a plastic bottle that has both design and practicality. can do.

  Furthermore, according to the structure in which the thickness of the column is 0.15 mm or more and 0.50 mm or less, the shape of the body can be maintained even if the panel is deformed, and the inside is positively pressurized by heating or the like. In this case, it is possible to provide a plastic bottle that is further suppressed in deformation of the bottom portion and the body portion, is kept constricted even during heating, and has both design and practicality.

  Furthermore, since the constricted circular portion is chamfered and the cross section in the axial direction is formed in an arc shape, it can be easily deformed particularly in the radial direction, and in particular, the ability to absorb positive pressure can be further improved. it can. Therefore, even when the inside is heated to a positive pressure by heating, etc., the bottom and torso parts are further prevented from deforming, and constriction is maintained during heating, providing a plastic bottle that has both design and practicality. can do.

  Furthermore, since the panel has a concave surface portion that is curved toward the inside of the plastic bottle, both in the axial direction and in the circumferential direction, it is possible to further increase the amount of deformation in the radial direction, particularly to the outside. To provide a plastic bottle that has both design and practicality because the deformation of the bottom and torso is suppressed even when the inside is positively pressurized, etc., and the constriction is maintained even during heating. it can.

  Furthermore, since the connection part which connects between adjacent pillars is formed in a constriction circumference part, the buckling strength of a plastic bottle can be raised. Accordingly, it is possible to provide a plastic bottle that is further suppressed in deformation of the body portion, is kept constricted even during heating, and has both design and practicality.

  Further, since the cylindrical portion is formed with lateral ribs extending in the circumferential direction, the pressure generated inside can be dispersed in the axial (height) direction, and in particular, the ability to absorb positive pressure can be further improved. it can. Therefore, even when the inside is heated to a positive pressure by heating, etc., the bottom part and the body part are further prevented from being deformed, and the necking is maintained even during heating, and the plastic bottle has both design and practicality. Can be provided.

  Furthermore, according to the configuration in which the cross section in the axial direction of the lateral rib is tapered, the pressure generated inside can be further dispersed, and in particular, the ability to absorb positive pressure can be further improved. Therefore, even when the inside is heated to a positive pressure by heating, etc., the bottom part and the body part are further prevented from being deformed, and the necking is maintained even during heating, and the plastic bottle has both design and practicality. Can be provided.

  Furthermore, according to the configuration in which the constricted circumferential portion is located at the center in the axial direction of the column and the panel, it is possible to provide a plastic bottle that has more excellent design and practicality.

  Furthermore, since the plurality of panels connected in the circumferential direction are configured to be 4 or more and 12 or less, the panels can be easily deformed particularly in the radial direction, and in particular, the positive pressure absorption ability can be further improved. Therefore, even when the inside is heated to a positive pressure by heating, etc., the bottom and torso parts are further prevented from deforming, and constriction is maintained during heating, providing a plastic bottle that has both design and practicality. can do.

  Furthermore, according to the configuration in which the ratio of the cylinder diameter in the constricted circular part of the column is 0.83 or more and 0.95 or less with respect to the cylindrical part, the deformation of the cylinder part is further suppressed, and the necking is also caused during heating. A plastic bottle that is maintained and has both design and practicality can be provided.

  Furthermore, according to the configuration in which the ratio of the body diameter of the panel that minimizes the body diameter at the constricted circular part is 0.70 or more and 0.82 or less, the ability to absorb positive pressure is further improved. It is possible to provide a plastic bottle that can be made and has both design and practicality.

  Furthermore, the temperature of the contents is 15 ° C. or more and 40 ° C. or less at the time of filling, and 50 ° C. or more and 80 ° C. or less at the time of high temperature, so that, for example, the positive pressure at the time of warm sales is sufficiently absorbed. It is possible to provide a plastic bottle having both design and practicality.

  Furthermore, the material constituting the plastic bottle is polyethylene terephthalate, and according to a configuration in which at least one of a germanium compound, a titanium compound, and an aluminum compound is used as a polymerization catalyst for polyethylene terephthalate, the plastic bottle has high transparency and heat resistance. It is possible to provide a plastic bottle that is excellent in design and has both design and practicality.

  Furthermore, since the filling body according to the present invention is composed of the above-described plastic bottle and the liquid to be filled, even when the inside is positively pressurized by heating or the like, deformation of the bottom portion and the trunk portion is suppressed. In addition, a constriction is maintained even during heating, and a filling body having both design and practicality can be provided.

It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 1st Embodiment was shown. It is a side view of a PET bottle. It is a top view of a PET bottle. It is the IV-IV sectional view taken on the line of FIG. It is a bottom view of a PET bottle. It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 2nd Embodiment was shown. It is a side view of a PET bottle. It is the VIII-VIII sectional view taken on the line of FIG. It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 3rd Embodiment was shown. It is a side view of a PET bottle. It is the XI-XI sectional view taken on the line of FIG. It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 4th Embodiment was shown. It is a side view of a PET bottle. It is the XIV-XIV sectional view taken on the line of FIG. It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 5th Embodiment was shown. It is a side view of a PET bottle. It is the XVII-XVII sectional view taken on the line of FIG. It is the front view by which the PET bottle as an example of the plastic bottle which concerns on 6th Embodiment was shown. It is a side view of a PET bottle. It is the XX-XX sectional view taken on the line of FIG. It is a front view of the PET bottle of Comparative Example 1.

<1. First Embodiment>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the plastic bottle according to the first embodiment will be described in detail. FIG. 1 is a front view showing a PET bottle 1 as an example of a plastic bottle according to the first embodiment, FIG. 2 is a side view of the PET bottle 1, and FIG. 3 is a plan view of the PET bottle 1. It is. The PET bottle 1 has the mouth part 10, the shoulder part 20, the trunk | drum 30, and the bottom part 40 in an axial direction one by one. In the following, for convenience of explanation, the mouth portion 10 in which the contents are filled into the container in the state of FIG. 1 or FIG. 2 upright so that the axial direction of the PET bottle 1 extends vertically is taken as the top. .

  The mouth portion 10 serves as a filling port, a spout, and a drinking port. By attaching a lid (not shown) to the mouth portion 10, the PET bottle 1 is sealed. The PET bottle 1 is assumed to be used for aseptic filling. Aseptic filling is aseptic filling in which the contents sterilized at high temperature in a short time are immediately cooled and packed in bottles at room temperature. Therefore, the mouth portion 10 is not crystallized and transparent until it is colored white by heating in a so-called crystallization apparatus so that heat resistance is added. However, the crystallized PET bottle 1 with the mouth 10 may be used.

  The upper side of the shoulder portion 20 is continuous with the mouth portion 10, while the lower side is continuous with the trunk portion 30. The shoulder portion 20 is formed in a substantially truncated cone shape whose diameter increases from the upper side to the lower side. Shoulder 20 is curved to the outside of PET bottle 1, side wall strength, which is the strength to withstand the load from the outside in the radial direction of PET bottle 1, resistance to positive pressure, and following the designed shape It is preferable from the viewpoints of formability, capacity and the like. However, when the PET bottle 1 is transported in a manner in which the mouth portion 10 is gripped, the shoulder portion 20 interferes or the shapeability is not good when the PET bottle 1 is formed by blow molding. It is not preferable that the shoulder portion 20 bends extremely outward, particularly upward.

  The body portion 30 includes a constricted portion 50 having a constricted diameter (outer diameter), an upper cylindrical portion 60 as a cylindrical portion having the largest body diameter, and a lower cylindrical portion on both sides in the axial direction across the constricted portion 50. 70. With the configuration in which the PET bottle 1 has the constricted portion 50 in the body portion 30, the design of the PET bottle 1 is enhanced and the ease of holding is improved.

  As illustrated in FIG. 1 and the like, the upper cylindrical portion 60 is located on the shoulder portion 20 side, and the lower cylindrical portion 70 is located on the bottom portion 40 side. The upper cylindrical portion 60 and the lower cylindrical portion 70 are both coaxial and have the maximum body diameter D1 of the PET bottle 1. Thereby, even if the PET bottle 1 is turned sideways, the upper cylindrical portion 60 and the lower cylindrical portion 70 having the maximum body diameter D1 can be grounded portions and can be placed stably, for example, loaded horizontally. It can also be applied to vending machines.

  On the other hand, the constricted portion 50 is configured such that the diameter of the waist is smaller than that of the upper cylindrical portion 60 and the lower cylindrical portion 70. The constricted portion 50 is constituted by columns 51 extending in the axial direction and panels 52 alternately in the circumferential direction of the PET bottle 1. The constricted portion 50 has a constricted circumferential portion 53 extending through the panel 52 in the circumferential direction from the innermost column 54 where the cylinder diameter is the smallest in the column 51.

  4 is a cross-sectional view taken along line IV-IV in FIG. The IV-IV line passes through the constricted circulation portion 53. The illustrated constricted portion 50 includes six columns 51 and a panel 52. And the cross-sectional shape of the horizontal direction of the constriction part 50 is exhibiting the substantially hexagonal shape as FIG. 4 shows.

  The column 51 has a rectangular shape that is long in the axial direction when viewed from the front. In the radial direction of the PET bottle 1, the column 51 has its upper and lower ends positioned on the outside, the column innermost 54 is positioned on the inner side, and is bent at the column innermost 54. It extends linearly on both sides (see FIG. 1). The column 51 is configured to have rigidity, and has a function of supporting a load of the PET bottle 1 particularly from the axial direction, and a function of withstanding the internal pressure of the sealed PET bottle 1 and preventing deformation of the body portion 30. The PET bottle 1 can maintain the shape in which the trunk | drum 30 was restrict | squeezed by the structure which has the pillar 51, when the inside is positive-pressure-ized by heating etc. FIG.

  The thickness of the column 51 greatly affects the rigidity (degree of difficulty in deformation). If the thickness of the column 51 is too thin, the rigidity will not increase, and the body 30 will be easily deformed by a load or internal pressure. On the other hand, if the thickness of the column 51 is too thick, the amount of material used increases, and the PET bottle 1 cannot be reduced in weight and costs increase. And it is preferable that the thickness of the column 51 is 0.15 mm or more and 0.50 mm or less. By being configured in this way, the PET bottle 1 can have both light weight and high strength against external force.

  When the neck portion 53 is viewed as a regular hexagon, the inner diameter between the two innermost poles 54 and 54 facing each other through the center is defined as the body diameter of the neck portion 53 of the column 51 (the column portion minimum body diameter D2). Is done. If the ratio of the minimum cylinder diameter D2 to the maximum cylinder diameter D1 is too small, that is, the degree of constriction is too large, the resin concentrates on the constricted part 50 when the PET bottle 1 is molded, and the thickness of the bottom 40 becomes thin. The bottom part 40 will be easily reversed. Furthermore, the constricted portion 50 is easily deformed without being able to support the load from the axial direction or the radial direction. On the other hand, if the ratio of the columnar minimum body diameter D2 to the maximum body diameter D1 is too large, that is, if the degree of constriction is too small, the constriction cannot be maintained during heating, and the design is impaired.

  The ratio of the cylinder diameter in the constricted circumferential part 53 of the column 51 (column minimum cylinder diameter D2 / maximum cylinder diameter D1) with respect to the upper cylindrical part 60 and the lower cylindrical part 70 is 0.83 or more and 0.95 or less. It is preferable that By comprising in this way, a deformation | transformation of PET bottle 1 can be suppressed, and design property can be improved, and easiness to hold can be improved.

  The panel 52 also has a rectangular shape that is long in the axial direction when viewed from the front. However, the panel 52 has a side longer than the column 51 in the circumferential direction. Each of the panels 52 is configured to be deformable inside and outside the PET bottle 1, particularly outside. Accordingly, the panel 52 has a function of absorbing pressure by changing the internal volume by changing the internal pressure of the sealed PET bottle 1, in particular by deforming following the positive pressure. On the other hand, as described above, even when the internal pressure of the PET bottle 1 changes, the structure of the constricted portion 50 itself is held with the column 51 as a skeleton.

  The constricted portion 50 configured as described above has high strength against external force, and can absorb both positive pressure and negative pressure inside and suppress distorted deformation. And when the PET bottle 1 is in a particularly positive pressure state, the bottom portion 40 can be prevented from bulging downward.

  The thickness of the panel 52 is also greatly involved in the rigidity of the panel 52. If the thickness of the panel 52 is too thin, the deformation of the panel 52 due to the load and the internal pressure becomes too large, and the PET bottle 1 is likely to be deformed distorted. On the other hand, if the thickness of the panel 52 is too thick, the panel 52 becomes difficult to deform and cannot absorb the change in internal pressure. And it is preferable that the thickness of the panel 52 is 0.15 mm or more and 0.50 mm or less. By comprising in this way, the change of an internal pressure is absorbed and it can prevent that the PET bottle 1 deform | transforms into an irregular shape.

  The circumferential length of the panel 52 is closely related to the number of the panels 52 constituting the constricted portion 50. That is, if the number of the panels 52 is too small, the panel 52 tends to be too long in the circumferential direction. And the deformation | transformation to the inside and outside of the PET bottle 1 of the panel 52 becomes too large, the panel 52 becomes easy to reverse outside, or the axial load concerning each panel 52 shows a tendency to become too large, The PET bottle 1 is likely to be deformed into an irregular shape. On the other hand, when the number of the panels 52 is too large, the panels 52 tend to be too short in the circumferential direction, and are less likely to be deformed into and out of the PET bottle 1 and hardly absorb changes in internal pressure. Therefore, it is preferable that the plurality of panels 52 connected in the circumferential direction are composed of 4 or more and 12 or less from the viewpoint of absorbing the change in the internal pressure and preventing the PET bottle 1 from being deformed in a distorted manner.

  In the radial direction of the PET bottle 1, the upper end and the lower end of the panel 52 are also located outside, the constricted circumferential portion 53 is located inside, and bends at the constricted circumferential portion 53. It extends in a straight line (see FIG. 2). A convex valley line (concave ridge line) is formed on the inside of the PET bottle 1 in the constricted circulation portion 53. Thus, the panel 52 can increase the amount of deformation in the radial direction, particularly to the outside, by having the constricted circular portion 53 with a narrowed body diameter. On the other hand, the valley line of the constricted circumferential portion 53 can prevent the panel 52 from being reversed outside in the radial direction of the PET bottle 1 due to the positive pressure. Therefore, with such a configuration, it is possible to improve the ability to absorb positive pressure, and to prevent the body portion 30 from being deformed in a distorted manner, such as excessively bulging outward.

  In addition, if the constriction circulation part 53 has inclination from a horizontal direction, the panel 52 will be easily deform | transformed unevenly by internal pressure. Therefore, it is preferable that the constriction circulation part 53 is formed in a horizontal direction without having an inclination. That is, it is preferable that the constricted circumferential portion 53 is formed at the same height so as to make one round of the PET bottle 1 in a state where the axial direction of the PET bottle 1 extends up and down.

  The distance between the two panels 52 and 52 that are opposite to each other when the constricted circumferential portion 53 is a regular hexagon is the trunk diameter of the panel 52 that minimizes the trunk diameter in the constricted circumferential portion 53 (panel minimum trunk diameter D3). Is defined. Normally, the panel portion minimum body diameter D3 is a distance connecting between the respective midpoints on the opposite side.

  If the ratio of the minimum body diameter D3 of the panel portion to the maximum body diameter D1 is too small, that is, if the degree of constriction is too large, the stretch distance at the time of blow molding becomes short, and the panel 52 becomes too thick and changes in internal pressure. It tends to be difficult to absorb and the bottom 40 tends to be too thin. On the other hand, if the ratio of the panel body minimum body diameter D3 to the maximum body diameter D1 is too large, that is, if the degree of constriction is too small, the panel 52 is likely to be reversed outside during positive pressure, and the design of the PET bottle 1 It is not possible to improve the performance and the ease of holding it. Then, the ratio of the body diameter of the panel 52 that minimizes the body diameter in the constricted circular portion 53 (panel portion minimum body diameter D3 / maximum body diameter D1) is 0 with respect to the upper cylindrical portion 60 and the lower cylindrical portion 70. It is preferable that it is 70 or more and 0.82 or less. By comprising in this way, the change of the internal pressure of the sealed PET bottle 1 can be absorbed, a deformation | transformation can be suppressed, and design property can be improved, and easiness to hold can be improved.

  The PET bottle 1 is required to maintain the constriction even when the panel 52 is deformed by the positive pressure. Accordingly, the panel 52 as a whole is configured not to swell up to at least the maximum trunk diameter D1. Furthermore, it is more preferable that the panel 52 is configured not to swell up to the body diameter of the column 51 portion in all horizontal sections. This is because the columns 51 adjacent to the panel 52 have rigidity and are constricted so as to have a column innermost portion 54 that minimizes the body diameter. This column 51 is suppressed, and the panel 52 maintains the constriction. It is realized by not to swell until it becomes impossible.

  Here, the diameter is used to calculate the ratio of the columnar minimum barrel diameter D2 and the panel unit minimum barrel diameter D3 to the maximum barrel diameter D1. However, the radius may be used to calculate these ratios when the constricted portion 50 is asymmetric in plan view, for example, when the columns 51 and the panels 52 are odd numbers. By using the radius, these ratios can be calculated in the same manner even in the constricted portion 50 configured asymmetrically.

  FIG. 5 is a bottom view of the PET bottle 1. The bottom portion 40 continues to the lower side of the lower cylindrical portion 70 of the trunk portion 30. The bottom portion 40 includes a corner portion 41, a bottom wall 42, a dome 43, and a rib 44. The corner portion 41 is curved toward the lower side in the axial direction of the PET bottle 1 and the outer side in the radial direction. The substantially flat annular bottom wall 42 extends in a direction perpendicular to the body portion 30 and serves as a ground contact surface of the PET bottle 1. The bottom wall 42 is preferably configured with a radial width as narrow as possible in order to suppress deformation of the PET bottle 1 during heating. The dome 43 protrudes from the bottom wall 42 toward the inner side (upper side) in the axial direction of the PET bottle 1 on the inner periphery of the bottom wall 42, and has a function of improving the strength of the bottom portion 40. The dome 43 is provided with a plurality of ribs 44 having a function of reinforcing the dome 43 in a radial manner in a bottom view.

  Note that the bottom 40 is not limited to the example shown in FIG. 5 and the like, and may be configured so as not to be deformed downward even if it is positively pressurized in a state where it is easily deformed by heat. The dome 43 is designed to be maintained at least higher than the ground plane of the PET bottle 1 even if it is deformed by heat. As a result, the bottom wall 42 is maintained as a ground contact surface, and rattling or overturning of the PET bottle 1 can be prevented.

  The PET bottle 1 is not limited by size and can be applied to various sizes. For example, the volume of the PET bottle 1 may be 100 ml or more and 520 ml or less widely used in warm sales. The total height H1 of the PET bottle 1 may be 100 mm or more and 250 mm or less, and the maximum trunk diameter D1 of the trunk portion 30 may be 30 mm or more and 80 mm or less. Furthermore, the PET bottle 1 according to the present embodiment can be used for a lightweight bottle. The mass of the PET bottle 1 may be, for example, 13 g or more and 28 g or less for 500 ml, and 12 g or more and 25 g or less for 350 ml.

  Examples of the material of the plastic bottle exemplified by the PET bottle 1 include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, and other polyolefins, ethylene-vinyl alcohol copolymers, plants, and the like. Various plastics that can be blow molded, such as polylactic acid, can be used. However, the plastic bottle is preferably composed mainly of polyester such as polyethylene naphthalate, particularly polyethylene terephthalate. In addition, various additives such as a colorant, an ultraviolet absorber, a release agent, a lubricant, a nucleating agent, an antioxidant, and an antistatic agent are blended with the above-described resin within a range that does not impair the quality of the molded product. be able to.

  As the ethylene terephthalate thermoplastic resin constituting the PET bottle 1, most of the ester repeating portion, generally 70 mol% or more is occupied by ethylene terephthalate units, and the glass transition point (Tg) is 50 ° C. or higher and 90 ° C. The melting point (Tm) is preferably in the range of 200 ° C. or higher and 275 ° C. or lower. As the ethylene terephthalate thermoplastic polyester, polyethylene terephthalate is particularly excellent in terms of pressure resistance, but in addition to the ethylene terephthalate unit, it consists of dibasic acids such as isophthalic acid and naphthalenedicarboxylic acid, and diols such as propylene glycol. Copolyesters containing a small amount of ester units can also be used.

  Polyethylene terephthalate has the highest production volume among thermoplastic synthetic resins. The polyethylene terephthalate resin has various characteristics such as excellent heat resistance, cold resistance, chemical resistance, and wear resistance. Furthermore, polyethylene terephthalate resin has a lower proportion of petroleum in its raw materials than other plastics, and can be recycled. Thus, according to the structure which has a polyethylene terephthalate as a main component, a material with much production amount can be used and the outstanding various characteristic can be utilized.

  Polyethylene terephthalate is obtained by condensation polymerization of ethylene glycol (ethane-1,2-diol) and purified terephthalic acid. As a polymerization catalyst for polyethylene terephthalate, at least one of a germanium compound, a titanium compound, and an aluminum compound is preferably used. By using these catalysts, it is possible to form a container having higher transparency and excellent heat resistance than using an antimony compound.

  A plastic bottle, for example, a PET bottle 1 can be produced by blow-molding a preform in which the above-described material is injection-molded. If PET bottle 1 is produced so that it may have the above characteristics, the manufacturing method will not be specifically limited.

  A filling body is constituted by the PET bottle 1 and a beverage as a liquid to be filled. For the production of the filler, aseptic filling in which the contents sterilized at a high temperature in a short time are immediately cooled and packed in the PET bottle 1 at room temperature, so-called aseptic filling can be used. However, for the production of the filling body, hot filling in which the PET bottle 1 crystallized in the mouth portion 10 is sterilized by heating to 85 ° C. to 90 ° C. and sterilizing the PET bottle 1 and the cap is performed. It may be used.

  The PET bottle 1 has an excellent function of absorbing changes in internal pressure, particularly positive pressure. Therefore, the contents of the PET bottle 1 can be suitably used for warming sales in a higher temperature state than at the time of filling. More specifically, the temperature of the contents is 15 ° C. or more and 40 ° C. or less at the time of filling, and 50 ° C. or more and 80 ° C. or less at the time of a high temperature state. The PET bottle 1 has a function of sufficiently absorbing such a change in internal pressure accompanying a temperature change, that is, a positive pressure.

  Next, the operation of the PET bottle 1 will be described in detail. As described above, the PET bottle 1 is sealed by attaching a lid to the PET bottle 1 by filling it with aseptic filling, for example, a beverage at 30 ° C. from the mouth portion 10. The thus manufactured filling body is shipped after being mounted on a corrugated board or the like after a label is attached to the body portion 30.

  In the store, the filler is placed on the product shelf in the hot warmer. The hot warmer includes a hot plate as a heater for heating and heating on the bottom surface of the product shelf. The filling body is heated and heated by being placed on a hot plate heated to 70 ° C. so that the liquid temperature becomes, for example, 55 ° C. or higher. When the PET bottle 1 is heated, the beverage and the gas sealed in the upper portion of the beverage are also heated, and the respective volumes increase. Thereby, the inside of the sealed PET bottle 1 is positively pressurized. By positively pressurizing the inside, each part of the PET bottle 1 is pushed outward.

  However, the panel 52 configured to have a large amount of deformation in the radial direction of the PET bottle 1 particularly in the outer side effectively absorbs pressure by deforming following the positive pressure and changing the inner volume. On the other hand, the rigid column 51 serves as a skeleton and holds the structure of the constricted portion 50. Furthermore, the column 51 constricted so as to have the column innermost portion 54 prevents the panel 52 from expanding until the constriction cannot be maintained. Therefore, even if the PET bottle 1 is heated and positively pressurized, the bottom 40 bulges downward, the barrel 30 bulges too much outward, and so on. Therefore, a good appearance and ease of holding can be maintained.

  As described above, the PET bottle 1 according to the first embodiment has the mouth portion 10, the shoulder portion 20, the trunk portion 30, and the bottom portion 40 sequentially in the axial direction, and the trunk portion 30 has a trunk diameter. The constricted constricted portion 50, and the upper cylindrical portion 60 and the lower cylindrical portion 70 having the largest barrel diameter on both sides in the axial direction across the constricted portion 50. The constricted portion 50 is respectively in the axial direction. The extending column 51 and the panel 52 are alternately connected in the circumferential direction, and the constricted circular portion 53 extending through the panel 52 in the circumferential direction from the innermost column 54 where the cylinder diameter is the smallest in the column 51. Have In the PET bottle 1 according to the first embodiment, since the panel 52 is configured to be easily deformed while having the constricted portion 50, the bottom portion 40 and the trunk portion 30 even when the inside is positively pressurized by heating or the like. The deformation of is suppressed. Therefore, according to 1st Embodiment, the necking is maintained also at the time of a heating, and the PET bottle 1 and filling body which have designability and practicality can be provided.

<2. Second Embodiment>
Next, the configuration of the plastic bottle according to the second embodiment will be described in detail. FIG. 6 is a front view showing a PET bottle 2 as an example of a plastic bottle according to the second embodiment, FIG. 7 is a side view of the PET bottle 2, and FIG. 8 is VIII-VIII in FIG. It is line sectional drawing. The PET bottle 2 has the same configuration and effects as the PET bottle 1 except that the shape of the panel 52 of the constricted portion 50 is different. Here, the same components as those in the PET bottle 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The PET bottle 2 has the mouth part 10, the shoulder part 20, the trunk | drum 130, and the bottom part 40 in an axial direction one by one. The body part 130 has a constricted part 150 with a reduced diameter. The constricted portion 150 is configured such that its body diameter is narrower than that of the upper cylindrical portion 60 and the lower cylindrical portion 70. The constricted portion 150 is configured by columns 51 extending in the axial direction and panels 152 alternately in the circumferential direction of the PET bottle 2. The constricted portion 150 has a constricted circumferential portion 153 extending through the panel 152 in the circumferential direction from the innermost column 54 where the cylinder 51 has the smallest cylinder diameter (the columnar minimum cylinder diameter D2).

  The line VIII-VIII in FIG. 6 passes through the constricted circulation part 153. The illustrated constricted portion 150 includes six columns 51 and a panel 152. As shown in FIG. 8, the horizontal cross-sectional shape of the constricted portion 150 has a so-called star shape, which is a concave dodecagon in which six sets of convex angles and concave angles are alternately arranged. FIG. 8 shows an imaginary line Lv connecting between the adjacent columns 51. The panel 152 is configured such that at least the region including the constricted circumferential portion 153 has a recess width W inside the radial direction of the PET bottle 2 relative to the virtual line Lv connecting the adjacent columns 51. . That is, when the PET bottle 2 is configured to have the same maximum body diameter D1 and the minimum column part body diameter D2 as the PET bottle 1, the panel part minimum body diameter D3 is larger in the panel 152 than in the panel 52. It is configured to be small (see FIGS. 4 and 8).

  In addition, as the column 51 and the panel 152 located at the right end of FIG. 7 indicate, in the radial direction of the PET bottle 2, the panel 152 is positioned outside the column 51 in the vicinity of the upper end and the lower end, The vicinity of the constricted circulation portion 153 is located inside the column 51. That is, the entire panel 152 does not have to be recessed inside the radial direction of the PET bottle 2.

  The panel 152 can have a larger amount of deformation, particularly outward in the radial direction, by having the constricted circumferential portion 153 inside the radial direction of the PET bottle 2. Therefore, the positive pressure absorption capability can be further improved by such a configuration. Furthermore, since the panel 152 is configured to have a smaller panel portion minimum body diameter D3, the distance to the maximum body diameter D1 is longer even when deformed by positive pressure, and the constriction is further maintained. Cheap. Therefore, with such a configuration, it is possible to maintain a good appearance and ease of holding even in a higher positive pressure state. Furthermore, since the PET bottle 2 is excellent in the ability to absorb positive pressure even if it is made lighter and more likely to be deformed, it can maintain a good appearance and ease of holding in a state where the inside is positively pressurized. it can.

  If the indentation width W is too small, the deformation amount of the panel 152 cannot be increased. On the other hand, if the indentation width W is too large, the panel 152 tends to be too thick, making it difficult to absorb changes in internal pressure. Therefore, the indentation width W is preferably 0.5 mm or more and 5.0 mm or less.

  As shown in FIG. 6 and the like, the constricted circumferential portion 153 has uneven thickness in the constricted portion 150 of the PET bottle 2 that is formed at the center of the column 51 and the panel 152 in the axial direction. It may decrease, making it difficult for distorted deformation during heating. Therefore, the design properties of the PET bottle 2 can be improved and the ease of holding can be improved.

<3. Third Embodiment>
Next, the configuration of the plastic bottle according to the third embodiment will be described in detail. FIG. 9 is a front view showing a PET bottle 3 as an example of a plastic bottle according to the third embodiment, FIG. 10 is a side view of the PET bottle 3, and FIG. 11 is XI-XI in FIG. It is line sectional drawing. The PET bottle 3 has the same configuration and effects as the PET bottle 2 except that the configuration of the upper cylindrical portion 60 and the lower cylindrical portion 70 is different. Here, the same components as those in the PET bottle 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The PET bottle 3 has the mouth part 10, the shoulder part 20, the trunk | drum 230, and the bottom part 40 in an axial direction sequentially. The trunk portion 230 includes a constricted portion 150 with a narrowed trunk diameter, and an upper cylindrical portion 260 and a lower cylindrical portion 270 as cylindrical portions having the largest trunk diameter on both sides in the axial direction across the constricted portion 150. . As illustrated in FIG. 9 and the like, the upper cylindrical portion 260 is located on the shoulder 20 side, and the lower cylindrical portion 270 is located on the bottom 40 side. Each of the upper cylindrical portion 260 and the lower cylindrical portion 270 has the maximum body diameter D1 of the PET bottle 1.

  In the upper cylindrical portion 260 and the lower cylindrical portion 270, groove-shaped upper lateral ribs 261 and lower lateral ribs 271 are formed as lateral ribs extending in the circumferential direction. With the configuration having the upper lateral rib 261 and the lower lateral rib 271, the deformation direction of the upper cylindrical portion 260 and the lower cylindrical portion 270 when the inside of the PET bottle 3 is positively pressurized is changed from the radial direction of the PET bottle 3. It can be changed to the direction of the axis (height). As a result, the pressure generated inside can be dispersed, and in particular, the ability to absorb positive pressure can be further improved. Therefore, even when the inside of the PET bottle 3 is more positively pressurized, the body 230 is not deformed into an irregular shape such as being excessively bulged outward, and the good appearance and ease of holding are maintained. be able to.

  Furthermore, even if the inside of the PET bottle 3 is positively pressurized by the upper horizontal rib 261 and the lower horizontal rib 271, the upper cylindrical portion 260 and the lower cylindrical portion 270 can be expanded in diameter, elliptical, or the like. Can be suppressed, and the maximum body diameter D1 can be stably maintained. Furthermore, the upper lateral rib 261 and the lower lateral rib 271 can increase the buckling strength and the side wall strength of the upper cylindrical portion 260 and the lower cylindrical portion 270, respectively. And the vendor suitability which is the characteristic of whether the PET bottle 3 is normally discharged | emitted from a vending machine improves by the side wall intensity | strength of the upper side cylindrical part 260 and the lower side cylindrical part 270 increasing. Furthermore, the upper horizontal rib 261 and the lower horizontal rib 271 also have an effect of improving the ease of label attachment and the ease of holding the PET bottle 3.

  Note that the XI-XI line in FIG. As illustrated in FIG. 11, the constricted portion 150 includes six pillars 51 and a panel 152. And the panel 152 is comprised so that the area | region containing the constriction surrounding part 153 may be dented in the radial inside of the PET bottle 3 rather than the virtual line Lv which connects between the adjacent pillars 51. FIG.

  Further, it is more preferable that the cross sections in the axial direction of the upper lateral rib 261 and the lower lateral rib 271 are configured to be tapered. Each of the upper lateral rib 261 and the lower lateral rib 271 formed in a taper shape extends in the axial direction with a fulcrum between the linear groove bottom surface and the linear groove side surface (upper and lower surfaces). The shape is easy to change. When the inside of the PET bottle 3 is heated to a positive pressure, for example, the upper lateral rib 261 and the lower lateral rib 271 extend in the axial direction to absorb the internal pressure, The deformation amount of 230 can be kept small. Therefore, with such a configuration, it is possible to maintain a good appearance and ease of holding even in a higher positive pressure state. And even if PET bottle 3 is still lighter, it can maintain a good appearance and ease of holding in a state in which the inside is positively pressurized.

  If the depth of each of the upper lateral rib 261 and the lower lateral rib 271 is too shallow, the pressure absorption capacity cannot be increased. On the other hand, if both the upper horizontal rib 261 and the lower horizontal rib 271 are too deep, the shapeability at the time of molding the PET bottle 3 is lowered. The depth of the upper lateral rib 261 and the lower lateral rib 271 is preferably such that the ratio to the maximum body diameter D1 is 0.005 or more and 0.09 or less, and is 0.01 or more and 0.05 or less. Is more preferable.

  If the widths of the upper lateral rib 261 and the lower lateral rib 271 are too wide, the pressure absorption capacity cannot be increased. On the other hand, when the widths of the upper horizontal rib 261 and the lower horizontal rib 271 are too narrow, the shapeability at the time of molding the PET bottle 3 is lowered. The width of the upper lateral rib 261 and the lower lateral rib 271 is preferably such that the ratio to the maximum body diameter D1 is 0.008 or more and 0.09 or less.

  Here, the configuration in which the upper horizontal rib 261 and the lower horizontal rib 271 are added to the PET bottle 2 is the PET bottle 3. However, this may be configured to add an upper lateral rib 261 and a lower lateral rib 271 to the PET bottle 1. By doing so, the pressure absorption capability of the PET bottle 1 can be further improved.

<4. Fourth Embodiment>
Next, the configuration of the plastic bottle according to the fourth embodiment will be described in detail. 12 is a front view showing a PET bottle 4 as an example of a plastic bottle according to the fourth embodiment, FIG. 13 is a side view of the PET bottle 4, and FIG. 14 is XIV-XIV in FIG. It is line sectional drawing. The PET bottle 4 has the same configuration and effects as the PET bottle 1 except that the shape of the panel 52 of the constricted portion 50 is different. Here, the same components as those in the PET bottle 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The PET bottle 4 has the mouth part 10, the shoulder part 20, the trunk | drum 330, and the bottom part 40 in an axial direction one by one. The body portion 330 has a constricted portion 350 with a reduced diameter. The constricted portion 350 is configured such that its body diameter is narrower than that of the upper cylindrical portion 60 and the lower cylindrical portion 70. The constricted portion 350 is configured such that columns 51 extending in the axial direction and panels 352 are alternately connected in the circumferential direction of the PET bottle 4. The constricted portion 350 includes a constricted circumferential portion 353 extending through the panel 352 in the circumferential direction from the innermost column 54 where the cylinder 51 has the smallest cylinder diameter (the columnar minimum cylinder diameter D2).

  The line XIV-XIV in FIG. As illustrated in FIG. 14, the constricted portion 350 includes six pillars 51 and a panel 352. And the panel 352 is good to be comprised so that the area | region containing the constriction rotation part 353 may be dented in the radial inside of the PET bottle 4 rather than the virtual line Lv which connects between the adjacent pillars 51. FIG. Each panel 352 illustrated in FIG. 14 is formed in an arc shape.

  The constricted circumferential portion 353 is chamfered so that the axial cross section of the PET bottle 4 is formed in an arc shape. As illustrated in FIG. 12, in the radial direction of the PET bottle 4, the column 51 has an upper end and a lower end positioned on the outside, the column innermost portion 54 is positioned on the inner side, and is bent at the column innermost portion 54. And extend linearly on both the upper and lower sides of the innermost column 54. On the other hand, in the radial direction of the PET bottle 4, the upper and lower ends of the panel 352 are located outside, the constricted circumferential portion 353 is located inside, and the constricted circumferential portion 353 is the apex, and both the upper and lower sides of the constricted circumferential portion 353. (See FIG. 13). That is, the constricted circumferential portion 353 is formed in a smooth curved surface that is convex toward the inside of the PET bottle 4 in the panel 352 portion.

  Thus, the panel 352 can be easily deformed particularly in the radial direction by having the waist diameter of the panel 352 and the curved constricted circumferential portion 353. Therefore, the positive pressure absorption capability can be further improved by such a configuration. Therefore, with such a configuration, the constriction is maintained even in a higher positive pressure state, and a good appearance and ease of holding can be maintained. Furthermore, even if the PET bottle 4 is lighter, it can maintain a good appearance and ease of holding in a state where the inside is positively pressurized.

<5. Fifth Embodiment>
Next, the configuration of the plastic bottle according to the fifth embodiment will be described in detail. 15 is a front view showing a PET bottle 5 as an example of a plastic bottle according to the fifth embodiment, FIG. 16 is a side view of the PET bottle 5, and FIG. 17 is XVII-XVII in FIG. It is line sectional drawing. The PET bottle 5 has the same configuration and effects as the PET bottle 1 except that the configuration of the panel 52 of the constricted portion 50 is different. Here, the same components as those in the PET bottle 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The PET bottle 5 has the mouth part 10, the shoulder part 20, the trunk | drum 430, and the bottom part 40 in an axial direction one by one. The body portion 430 has a constricted portion 450 with a reduced body diameter. The constricted portion 450 is configured such that its body diameter is narrower than that of the upper cylindrical portion 60 and the lower cylindrical portion 70. The constricted portion 450 is configured by columns 51 extending in the axial direction and panels 452 alternately in the circumferential direction of the PET bottle 5. The constricted portion 450 has a constricted circumferential portion 453 extending through the panel 452 in the circumferential direction from the innermost column 54 where the cylinder 51 has the smallest cylinder diameter (the columnar minimum cylinder diameter D2).

  The XVII-XVII line in FIG. 15 passes through the constricted circulation part 453. As illustrated in FIG. 17, the constricted portion 450 includes six pillars 51 and a panel 452. And the panel 452 is good to be comprised so that the area | region containing at least the constriction rotation part 453 may be dented inside the radial direction of the PET bottle 5 rather than the line | wire which connects between the adjacent pillars 51. FIG.

  In the radial direction of the PET bottle 5, the upper end and the lower end of the panel 452 are located on the outside, the constricted circumferential portion 453 is located on the inner side, and bends at the constricted circumferential portion 453, on both upper and lower sides of the constricted circumferential portion 453. It extends in a straight line (see FIG. 16). A convex valley line is formed on the inner side of the PET bottle 5 in the constricted circulation portion 453.

  The panel 452 configured as described above further includes a concave surface portion 455 whose axial and circumferential cross sections are curved toward the inside of the PET bottle 5. In the illustration of FIG. 16 and the like, one concave surface portion 455 is provided on each side of the axial direction from the constricted circumferential portion 453 with respect to each panel 452. The panel 452 has a concave surface portion 455 that curves toward the inside of the PET bottle 5, so that the amount of deformation in the radial direction, particularly outward, can be increased. Therefore, with such a configuration, it is possible to improve the ability to absorb positive pressure, and to prevent the body portion 430 from being deformed in a distorted manner, such as excessively bulging outward.

  With such a configuration, the PET bottle 5 can maintain a good appearance and ease of holding even in a higher positive pressure state. Furthermore, even if the PET bottle 5 is lighter, it can maintain a good appearance and ease of holding in a state where the inside is positively pressurized.

  More preferably, the constricted circumferential portion 453 is formed with a connecting portion 456 that connects the adjacent columns 51. When the body diameter is narrowed like the constricted circumferential part 453, the stress against the axial load of the PET bottle 5 tends to concentrate on the constricted circumferential part 453. Therefore, the connection portion 456 is provided in the constricted circumferential portion 453, so that the constricted circumferential portion 453 is prevented from being bent and the PET bottle 5 is prevented from buckling. Therefore, the connecting portion 456 can increase the buckling strength of the PET bottle 5 and prevent distorted deformation.

<6. Sixth Embodiment>
Next, the configuration of the plastic bottle according to the sixth embodiment will be described in detail. 18 is a front view showing a PET bottle 6 as an example of a plastic bottle according to the sixth embodiment, FIG. 19 is a side view of the PET bottle 6, and FIG. 20 is a XX-XX in FIG. 18. It is line sectional drawing. The PET bottle 6 has the same configuration and effects as the PET bottle 1 except that the configuration and shape of the panel 52 of the constricted portion 50 are different. The PET bottle 6 has the characteristics of both the PET bottle 4 and the PET bottle 5. Here, the same components as those in the PET bottle 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The PET bottle 6 has the mouth part 10, the shoulder part 20, the trunk | drum 530, and the bottom part 40 in an axial direction one by one. The body portion 530 has a constricted portion 550 with a reduced body diameter. The constricted portion 550 is configured such that its body diameter is narrower than that of the upper cylindrical portion 60 and the lower cylindrical portion 70. The constricted portion 550 is constituted by columns 51 extending in the axial direction and panels 552 alternately in the circumferential direction of the PET bottle 6. The constricted portion 550 has a constricted circumferential portion 553 extending through the panel 552 in the circumferential direction from the innermost column 54 where the cylinder 51 has the smallest cylinder diameter (the columnar minimum cylinder diameter D2).

  The line XX-XX in FIG. 18 passes through the constricted circulation part 553. As illustrated in FIG. 20, the constricted portion 550 includes six columns 51 and a panel 552. The panel 552 may be configured such that at least a region including the constricted circumferential portion 553 is recessed inward in the radial direction of the PET bottle 6 from a line connecting adjacent columns 51.

  The constricted circumferential portion 553 is chamfered so that the axial cross section of the PET bottle 6 is formed in an arc shape. As illustrated in FIG. 18 and the like, in the radial direction of the PET bottle 6, the column 51 has its upper end and lower end positioned on the outside, the column innermost portion 54 positioned on the inner side, and bent at the innermost column 54. Thus, it extends linearly on the upper and lower sides of the innermost column 54 (see FIG. 18). On the other hand, in the radial direction of the PET bottle 6, the upper and lower ends of the panel 552 are located outside, the constricted circumferential portion 553 is located inside, and the constricted circumferential portion 553 is the apex, and both upper and lower sides of the constricted circumferential portion 553. It extends in a curved shape toward That is, the constricted circumferential portion 553 is formed in a smooth curved surface that is convex toward the inside of the PET bottle 6 in the panel 552 portion.

  The panel 552 configured as described above further includes a concave surface portion 555 whose axial and circumferential cross sections are curved toward the inside of the PET bottle 6. In the illustration of FIG. 18 and the like, one concave surface portion 555 is provided on each side of the axial direction from the constricted circumferential portion 553 with respect to each panel 552.

  Note that, as shown by the concave surface portion 555 of the panel 552 located at the right end in FIG. 19, the concave surface portion 555 may be positioned inside the constricted circumferential portion 553 in the radial direction of the PET bottle 6. Since the panel 552 has the concave surface portion 555 configured as described above, the amount of deformation in the radial direction, particularly outward, can be increased. This can be similarly applied to the concave surface portion 455 of the panel 452 described above.

  In addition, it is more preferable that the connection part 556 which connects between the adjacent pillars 51 is formed in the constriction surrounding part 553.

  With such a configuration, the PET bottle 6 can maintain a good appearance and ease of holding even in a higher positive pressure state. Furthermore, even if the PET bottle 6 is lighter, it can maintain a good appearance and ease of holding in a state where the inside is positively pressurized.

  Note that the PET bottles 1, 2, 3, 4, 5, and 6 according to the present embodiment described above can be freely combined within a range where no contradiction occurs. For example, the PET bottle 6 illustrated in FIG. 18 and the like may have an upper lateral rib 261 and a lower lateral rib 271 like the PET bottle 3 illustrated in FIG. 9 and the like. Furthermore, the PET bottle 6 may have a clear star shape in which the horizontal cross section of the constricted circular portion 553 is shown in FIG.

  In the PET bottles 1, 2, 3, 4, 5, and 6 according to this embodiment (hereinafter, the description is appropriately omitted because it is the same as the PET bottle 1), the panel 52 is deformed while having the constricted portion 50. By being configured easily, deformation of the bottom portion 40 and the trunk portion 30 can be suppressed even when the inside is positively pressurized by heating or the like. Therefore, according to the present embodiment, it is possible to provide the PET bottle 1 and the filling body that are kept constricted even when heated and have both design and practicality.

  Hereinafter, the present disclosure will be described in more detail and specifically with reference to examples. However, the present disclosure is not limited to the following examples.

<Materials and methods>
[Example 1]
A PET bottle 1 according to the present embodiment shown in FIG. 1 and the like was produced using a 25 g preform made of polyethylene terephthalate and having a transparent mouth portion 10. And the filling body comprised by PET bottle 1 with a full injection capacity of 300 ml and 280 ml of water filled at 30 degreeC was produced. In the PET bottle 1 and the filling body according to the first embodiment, the constricted portion 50 is configured such that the columns 51 and the panels 52 that extend in the axial direction are alternately connected in the circumferential direction, and the body diameter of the columns 51 is the smallest. It has the characteristics according to the present embodiment, such as having a constricted circumferential portion 53 extending through the panel 52 in the circumferential direction from the innermost column 54 which is a position.

  The filler was placed on the product shelf of a hot warmer equipped with a hot plate for heating and heating on the bottom of the product shelf. The hot plate was set at 70 ° C. and the packing was placed for 1 week.

[Comparative Example 1]
Comparative Example 1 was the same as Example 1 except that the PET bottle 700 shown in FIG. 21 was used. The PET bottle 700 does not have a constriction in the body portion 730, has a column 751 extending in the axial direction, and has a substantially rectangular pressure extending between the adjacent columns 751 and 751 in the long side in the axial direction. An absorption panel 752 is provided. Therefore, the PET bottle 700 according to Comparative Example 1 and the filler did not have the characteristics according to the present embodiment.

<Evaluation method>
(Buckling strength test)
The buckling strength in the upright state of the PET bottles 1 and 700 was measured for each of the fillers of Example 1 and Comparative Example 1. For the measurement of buckling strength, a tester manufactured by AGR, TOP LOAD, was used. A load was applied from the top of the mouth portion 10 at a constant speed, and the maximum load that resulted in a so-called yielding state was defined as the buckling strength. In the determination of the buckling strength, a threshold value was set to 250 N or more or less. Table 1 shows the results of the evaluation of the buckling strength of each filler, and is indicated by ◯: with buckling strength and x: insufficient buckling strength.

(Heating pressure resistance performance test)
The heating pressure resistance performance of each of the fillers of Example 1 and Comparative Example 1 was measured. Since the influence when the filler is heated appears most remarkably in the bottom 40, the presence or absence of deformation of the bottom 40 was used as an index of the heating pressure resistance. Table 1 shows the results of the evaluation of the warming pressure resistance performance of each filler, and is indicated by ◯: with warming pressure performance, and x: insufficient warming pressure performance.

(Deformation amount during heating)
The amount of deformation (expansion) of the trunk portions 30 and 730 of each of the fillers of Example 1 and Comparative Example 1 placed in a heated state for 1 week was measured. Table 1 shows the results of the evaluation of deformation during heating in each filled body, and is indicated by ◯: less than 2 mm and x: 2 mm or more.

(Monitoring survey)
Each of the PET bottles 1 and 700 of Example 1 and Comparative Example 1 each filled with water is prepared, and the one having excellent ease of holding is selected for 100 monitors in their 20s to 70s. I received it. Those selected for each monitor from PET bottles 1 and 700 were counted as one by one. Table 1 shows the total score.

(Comprehensive evaluation)
Based on the above-described buckling strength test, pressure resistance performance test, deformation amount during heating, and monitoring investigation, comprehensive evaluation of the PET bottles 1 and 700 (each filler) of Example 1 and Comparative Example 1 It has been made. Table 1 shows the results of comprehensive evaluation. Comprehensive evaluation is described by (circle): favorable and x: no aptitude.

  The following points were derived from the examples described above. As shown in Table 1, in Example 1, although it has a constricted portion 50, it has sufficient buckling strength, is excellent in heating pressure resistance, and has a deformation amount during heating. It was suppressed to less than 2 mm. Many monitors supported their ease of holding. On the other hand, in Comparative Example 1, although it had buckling strength and was excellent in heating pressure resistance performance, the amount of deformation during heating was large, and since it did not have any constriction, it was easy to hold. It was inferior. In Example 1, the buckling strength was remarkably superior to that of Comparative Example 1.

[Example 2]
Example 2 was the same as Example 1 except that a 22 g preform was used and the PET bottle 2 shown in FIG. 6 and the like was used. Therefore, the PET bottle 2 and the filling body according to Example 2 also have the characteristics according to the present embodiment, similarly to the PET bottle 1 and the filling body according to Example 1.

[Example 3]
Example 3 was the same as Example 1 except that a 22 g preform was used and the PET bottle 4 shown in FIG. 12 and the like was used. Therefore, the PET bottle 4 and the filling body according to Example 3 also have the characteristics according to the present embodiment, similarly to the PET bottle 1 and the filling body according to Example 1.

[Example 4]
Example 4 was the same as Example 1 except that a 22 g preform was used and the PET bottle 5 shown in FIG. 15 and the like was used. Therefore, the PET bottle 5 and the filling body according to Example 4 also have the characteristics according to the present embodiment, similarly to the PET bottle 1 and the filling body according to Example 1.

  The following points were derived from the examples described above. In each of Example 2, Example 3, and Example 4, the weight reduction is achieved and the structure is provided with the constricted portion 50. However, as in Example 1, it has sufficient buckling strength. In addition, it was excellent in heating pressure resistance. In all of Example 2, Example 3, and Example 4, as in Example 1, it was easy to hold.

[Example 5]
In Example 5, a 22 g preform was used, and the PET bottle 3 shown in FIG. 9 and the like was used, and the same as in Example 1 except that the filler was placed for 3 weeks. Therefore, the PET bottle 3 and the filling body according to Example 5 also have the characteristics according to the present embodiment, similarly to the PET bottle 1 and the filling body according to Example 1.

[Example 6]
In Example 6, a 22 g preform was used, and the PET bottle 6 shown in FIG. 18 and the like was used, and the same as Example 1 except that the filler was placed for 3 weeks. Therefore, the PET bottle 6 and the filling body according to Example 6 also have the characteristics according to the present embodiment, similarly to the PET bottle 1 and the filling body according to Example 1.

  The following points were derived from the examples described above. In each of Example 5 and Example 6, the weight is reduced and the necking portion 50 is provided, but the buckling strength is sufficient as in Example 1, and the heating is performed. Excellent pressure resistance. And this heating pressure resistance performance was maintained over 3 weeks. And both Example 5 and Example 6 had ease of holding similarly to Example 1.

  From the results of the above examples, the PET bottles 1, 2, 3, 4, 5, and 6 and the filler according to the present embodiment have a constricted portion 50, and the inside is positively heated by heating and heating. It was shown that the deformation of the bottom portion 40 can be sufficiently suppressed even when it is applied. Moreover, it is shown that the PET bottles 2, 3, 4, 5, and 6 still exhibit this effect even when the weight is reduced, and among these, the PET bottles 3 and 6 maintain this effect over a long period of time. Was shown to do. Therefore, in this embodiment, it was shown that PET bottles 1, 2, 3, 4, 5, and 6 having both design and practicality and a filler can be provided.

  The present disclosure can be suitably used for manufacturing various filling bodies filled with liquid as contents. However, the present disclosure is not limited to the above-described embodiments and examples. The filling body of the present disclosure can be any filling material containing, for example, foods including non-carbonated beverages such as water, green tea, oolong tea, black tea, coffee, fruit juice, and soft drinks, industrial products, pharmaceuticals, etc. Useful for the body. In particular, since the deformation of the container can be suppressed even under positive pressure conditions, it is suitable for warm sales in stores and the like, and is also suitable for use in vending machines.

1, 2, 3, 4, 5, 6 PET bottles (plastic bottles)
10 mouth part 20 shoulder part 30, 130, 230, 330, 430, 530 trunk part 40 bottom part 50, 150, 350, 450, 550 constriction part 51 pillar 52, 152, 352, 452, 552 panel 53, 153, 353, 453, 553 Constriction circulation part 54 Column innermost part 60, 260 Upper cylindrical part (cylindrical part)
70,270 Lower cylindrical part (cylindrical part)
261 Upper horizontal rib (horizontal rib)
271 Lower horizontal rib (horizontal rib)
455, 555 Concave surface portion 456, 556 Connecting portion D1 Maximum body diameter D2 Column portion minimum body diameter D3 Panel portion minimum body diameter Lv Virtual line

Claims (17)

In a plastic bottle having a mouth portion, a shoulder portion, a trunk portion, and a bottom portion sequentially in the axial direction,
The trunk is
A constricted portion with a narrowed body diameter;
A cylindrical portion having the largest trunk diameter on both sides in the axial direction across the constricted portion;
The constricted portion includes columns extending in the axial direction and panels alternately arranged in the circumferential direction, and extends through the panel in the circumferential direction from a position where the body diameter is minimum in the columns. A plastic bottle characterized by having a constricted circumference. The plastic bottle according to claim 1, wherein the content of the plastic bottle is used for warming sales in a higher temperature state than at the time of filling. 3. The panel according to claim 1, wherein an area including at least the constriction circulation part is recessed inside the plastic bottle from a line connecting adjacent columns. 4. The described plastic bottle. 4. The plastic bottle according to claim 1, wherein a thickness of the panel is 0.15 mm or more and 0.50 mm or less. The plastic bottle according to any one of claims 1 to 4, wherein a thickness of the column is 0.15 mm or more and 0.50 mm or less. The plastic bottle according to any one of claims 1 to 5, wherein the constricted circumferential portion is chamfered and the cross section in the axial direction is formed in an arc shape. 7. The panel according to claim 1, wherein both the axial direction and the circumferential cross section have a concave surface portion that curves toward the inside of the plastic bottle. Plastic bottle. The plastic bottle according to any one of claims 1 to 7, wherein a connection portion that connects between the adjacent columns is formed in the constricted circulation portion. The plastic bottle according to any one of claims 1 to 8, wherein a lateral rib extending in the circumferential direction is formed in the cylindrical portion. The plastic bottle according to claim 9, wherein a cross section of the lateral rib in the axial direction is tapered. The plastic bottle according to any one of claims 1 to 10, wherein the constricted circulation part is located at a center of the column and the panel in the axial direction. The plastic bottle according to any one of claims 1 to 11, wherein the plurality of panels connected in the circumferential direction are configured to be 4 or more and 12 or less. The ratio of the trunk diameter in the constriction circulation part of the pillar with respect to the cylindrical part is 0.83 or more and 0.95 or less, characterized by things. Plastic bottle. The ratio of the body diameter of the panel that minimizes the body diameter at the constricted circular part to the cylindrical part is 0.70 or more and 0.82 or less. The plastic bottle according to any one of the above. The temperature of the contents is 15 ° C or more and 40 ° C or less at the time of filling, and is 50 ° C or more and 80 ° C or less at a high temperature state, according to any one of claims 1 to 14. Plastic bottle. The material constituting the plastic bottle is polyethylene terephthalate, and at least one of a germanium compound, a titanium compound, and an aluminum compound is used as a polymerization catalyst for the polyethylene terephthalate. The plastic bottle according to item. A plastic bottle according to any one of claims 1 to 16,
A filling body comprising a liquid to be filled.

Images