JP2017197258A - Plastic bottle, filling body, and production method of filling body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle comprising light weight and high intensity to external force, which has durability to pressure change on inside, especially stronger negative pressure, and whose deformation can be suppressed even under a severe condition, a filling body and a production method of a filling body.SOLUTION: A plastic bottle comprises: a mouth part 10; a shoulder part 20; a trunk 30; and a bottom part 40. The trunk 30 has on its part, a narrow part 50 whose trunk diameter is narrow relative to a trunk diameter on other parts of the trunk, the narrow part 50 comprises an annular peripheral groove 51, a pressure absorption part 52 formed of rectangular panels 53 continuous in a peripheral direction, the rectangular panels deforming outward and inward of a PET bottle 1 according to change of inner pressure of the PET bottle, on one side of an axial direction with the peripheral groove 51 as a reference, and a reinforcement part 60 for maintaining a shape of the PET bottle 1 regardless of change of the inner pressure on the other side of the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plastic bottle, a filling body, and a method for manufacturing the filling body. More specifically, the present invention supports a severe situation such as so-called hot filling in which a molded plastic bottle is filled with a liquid while sterilizing at a high temperature. The present invention relates to a plastic bottle, a filler, and a method for manufacturing the filler.

  As containers filled with beverages, plastic bottles, especially PET (PolyEthylene Terephthalate) bottles are often used. And the weight reduction of the PET bottle by reducing the usage-amount of a raw material from a viewpoint, such as resource saving and environmental load reduction at the time of transport, is tackled.

  However, PET bottles tend to be thinner and lighter as the weight is reduced. For example, when PET bottles that do not have sufficient buckling strength that can withstand loads in the vertical direction are packed in a cardboard box and the cardboard boxes are stacked in multiple stages, the PET bottle is seated on the PET bottle. Bending deformation may occur and the collapse of the load may occur. Furthermore, when a PET bottle that does not have sufficient side wall strength to withstand the load from the horizontal direction is loaded sideways inside the vending machine, the side surface of the PET bottle is deformed, and the automatic There is a risk that the machine will not discharge properly.

  Furthermore, in a severe situation where so-called hot filling in which a beverage at a high temperature (for example, 85 ° C.) is filled is performed or storage of a beverage in a PET bottle is extremely long, the risk becomes more prominent. .

  In Patent Document 1, after container molding, the molded container is directly transferred to the contents filling step, the contents are filled in the mouth amorphous polyester container, and the container mouth temperature at the time of sterilization after sealing is , A method for producing a container-packed content in which the container is sterilized within a range of 61 ° C. or higher and lower than the glass transition temperature (80 ° C. or lower) determined by the moisture content of the container is disclosed.

JP 2004-331205 A

  Inside the plastic bottle, a pressure change occurs with a change in temperature, a change in the state of the contents, and the like. And the plastic bottle is more likely to be deformed under the influence of the change in internal pressure as the weight is reduced. However, Patent Document 1 does not describe anything about the mass of the container.

  According to the method for producing a container-packed content of Patent Document 1, by directly transferring the molded container to the content filling step, the time from the container molding to the content filling is shortened, so that the container is an external environment. It is said that the amount of moisture absorbed from the water can be reduced and the moisture content of the container can be kept low. And sufficient commercial sterility can be obtained by filling a container with the filling temperature (61-80 degreeC) in the temperature range within 61 degreeC or more and less than the glass transition temperature defined by the moisture content of a container. Therefore, it is possible to use a mouth non-crystalline polyester container whose glass transition temperature is within this temperature range.

  However, Patent Document 1 does not describe any deformation caused by changes in the strength of the container or the internal pressure of the container.

  Therefore, an object of the present invention is a plastic bottle, a filling body that has both lightness and high strength against external force, and that can withstand pressure change inside, particularly stronger negative pressure, and can suppress deformation even under severe conditions. And it is providing the manufacturing method of 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 trunk portion, and a bottom portion, wherein the trunk portion has a constricted portion with a narrowed trunk diameter in part. The constricted portion has an annular circumferential groove and a substantially rectangular panel that is deformed inside and outside the plastic bottle in response to a change in the internal pressure of the plastic bottle on one side in the axial direction with respect to the circumferential groove. It has a pressure absorption part constituted in a row in the circumferential direction, and a reinforcing part that maintains the shape of the plastic bottle regardless of the change in the internal pressure on the other side.

  Further, the reinforcing portion has a plurality of annular reinforcing grooves.

  Furthermore, the circumferential groove is configured so that the body diameter is minimized, and the pressure absorbing portion is located on the outer side in the radial direction of the plastic bottle than the circumferential groove.

  Furthermore, the pressure absorbing portion is located at least 2 mm outside the circumferential groove in the radial direction of the plastic bottle.

  Furthermore, the ridgeline which divides the said panel adjacent in the said circumferential direction extends in the said axial direction.

  Furthermore, the pressure absorbing portion further includes a chamfered portion chamfered with respect to the ridgeline.

  Furthermore, the value of the ratio of the mass to the volume of the plastic bottle is 0.0392 g / ml or more and 0.0600 g / ml or less.

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

  Further, the body portion has a cylindrical portion having the largest body diameter on both sides in the axial direction across the constricted portion.

  Further, the shoulder portion has an iris diaphragm-like rib.

  Further, the ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.50 or less.

  Furthermore, the ratio of the ratio of the width of the panel in the circumferential direction to the maximum body diameter is 0.2 or more and 0.8 or less.

  Furthermore, the plastic bottle has heat resistance against a high-temperature liquid to be filled, and the mouth is transparent.

  Furthermore, the temperature of the high temperature liquid is 71 ° C. or higher and 95 ° C. or lower.

  Furthermore, the temperature of the high temperature liquid is 81 ° C. or higher and 90 ° C. or lower.

  Furthermore, the crystallinity of the body is 25% or more and 45% or less.

  Further, the material constituting the plastic bottle is polyethylene terephthalate.

Furthermore, the density of the body portion is 1.367 g / cm ³ or more and 1.387 g / cm ³ or less.

  Further, the body portion is cut into a cut piece of 10 mm × 50 mm, and the cut fracture piece has a tensile fracture strain at 300 mm / min at 85 ° C. of 40% or more and 68% or less. To do.

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

  Furthermore, the decompression amount of the filler is 1 kPa or more and 20 kPa or less.

  Furthermore, the present invention is a method for producing a filling body in which a plastic bottle molded from a preform having a transparent mouth is filled with a liquid, the plastic bottle comprising a mouth, a shoulder, and a body And the bottom part, and the body part has a constricted part with a constricted body diameter in part, and the constricted part has an annular circumferential groove and one axial direction with respect to the circumferential groove. According to the pressure absorption part formed on the side, a substantially square panel that deforms in and out of the plastic bottle in response to the change in the internal pressure of the plastic bottle, and the other side according to the change in the internal pressure. A step of heating the body portion of the preform, a step of blow-molding the plastic bottle from the preform using a mold, and the plastic. Bottle high Filling the liquid, attaching a cap to the mouth of the plastic bottle, tumbling and sterilizing the mouth of the plastic bottle and the cap, and cooling the plastic bottle A step of blowing cooling air to the plastic bottle in the blow molding step, and heating the body portion of the preform to 95 ° C. or higher and 135 ° C. or lower, The mold temperature is set to 80 ° C. or higher and 125 ° C. or lower, and all processes are performed in an in-line manner.

  Further, the step of blowing cooling air to the plastic bottle is omitted, and the temperature of the body die is set to 80 ° C. or higher and 115 ° C. or lower.

  Furthermore, the temperature of the body portion of the preform is higher than the temperature of the body mold.

  According to the present invention, in a plastic bottle having a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, the trunk portion has, in part, a constricted portion with a narrowed trunk diameter, Pressure absorption consisting of an annular circumferential groove and a substantially square panel that deforms in and out of the plastic bottle in response to changes in the internal pressure of the plastic bottle on one side in the axial direction with respect to the circumferential groove. Part and the reinforcing part that maintains the shape of the plastic bottle regardless of the change in internal pressure on the other side, so it has both light weight and high strength against external force, and more It is possible to provide a plastic bottle that can withstand strong negative pressure and can be prevented from being deformed even under severe conditions.

  Furthermore, according to the structure which has a some annular reinforcement groove | channel, a reinforcement part has both lightness and higher intensity | strength with respect to external force, and endures the pressure change in an inside, especially a stronger negative pressure, and is severe. It is possible to provide a plastic bottle in which deformation is more reliably suppressed even under conditions.

  Furthermore, the circumferential groove is configured to have a minimum body diameter, and the pressure absorbing portion is configured to be positioned on the outer side in the radial direction of the plastic bottle rather than the circumferential groove, so that light weight and higher strength against external force are achieved. It is possible to provide a plastic bottle that can be used together and can withstand internal pressure changes, in particular, a stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Furthermore, according to the structure which a pressure absorption part is located at least 2 mm outer side of the radial direction of a plastic bottle rather than a circumferential groove, it has both lightness and higher intensity | strength with respect to external force, and pressure change in an inside In particular, it is possible to provide a plastic bottle that can withstand a particularly strong negative pressure and that can more reliably suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the ridge line separating adjacent panels in the circumferential direction extends in the axial direction, it has both light weight and higher strength against external force, and withstands pressure change inside, particularly stronger negative pressure, It is possible to provide a plastic bottle in which deformation is more reliably suppressed even under severe conditions.

  According to the configuration further including the chamfered portion that is chamfered with respect to the ridgeline, the pressure absorbing portion has both light weight and higher strength against external force, and pressure change in the inside, particularly strong negative pressure. It is possible to provide a plastic bottle that can endure and more reliably suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the value of the ratio of the mass to the volume of the plastic bottle is 0.0392 g / ml or more and 0.0600 g / ml or less, it has both higher lightness and higher strength against external force. In addition, it is possible to provide a plastic bottle that can withstand pressure changes in the inside, in particular, a stronger negative pressure, and can suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the thickness of the circumferential groove is not less than 0.15 mm and not more than 0.50 mm, it has both lightness and higher strength against external force, and pressure change in the inside, particularly stronger It is possible to provide a plastic bottle that can withstand negative pressure and can more reliably suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the body portion has cylindrical portions with the largest body diameter on both sides in the axial direction across the constricted portion, the body portion has both light weight and high strength against external force, and pressure change in the inside. In particular, it can withstand a stronger negative pressure, can be prevented from being deformed even under severe conditions, and can provide a plastic bottle with a wider application range.

  Furthermore, according to the structure having the iris diaphragm-shaped rib, the shoulder portion has both lightness and higher strength against external force, and can withstand internal pressure changes, particularly stronger negative pressure, It is possible to provide a plastic bottle in which deformation can be more reliably suppressed even underneath.

  Furthermore, according to the configuration in which the ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.50 or less, light weight and higher strength against external force It is possible to provide a plastic bottle that can withstand pressure changes in the interior, in particular, a stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the value of the ratio of the width in the circumferential direction of the panel to the maximum body diameter is 0.2 or more and 0.8 or less, it has both lightness and higher strength against external force, and It is possible to provide a plastic bottle that can withstand pressure changes in the inside, in particular, a stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Further, the plastic bottle has heat resistance to the high-temperature liquid to be filled, and the mouth portion has a light weight and higher strength against external force according to the transparent structure, and inside the It is possible to provide a plastic bottle that can withstand a pressure change, particularly a stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Furthermore, since the temperature of the high-temperature liquid is 71 ° C. or higher and 95 ° C. or lower, it has both lightness and high strength against external force, and can withstand internal pressure changes, particularly stronger negative pressure, It is possible to provide plastic bottles that are less deformed underneath and contribute to high quality products.

  Furthermore, since the temperature of the high-temperature liquid is 81 ° C. or higher and 90 ° C. or lower, it has both lightness and high strength against external force, and can withstand internal pressure changes, particularly stronger negative pressure, It is possible to provide a plastic bottle that is restrained from being deformed underneath, has a wider range of application, and contributes to higher product quality.

  Furthermore, according to the configuration in which the crystallinity of the body portion is 25% or more and 45% or less, it has both light weight and higher strength against external force, and pressure change in the inside, particularly stronger negative pressure. It is possible to provide a plastic bottle that can endure and more reliably suppress deformation even under severe conditions.

  Furthermore, since the plastic bottle is made of polyethylene terephthalate, it has both light weight and high strength against external force, and withstands internal pressure changes, especially strong negative pressure, and can be deformed even under severe conditions. It is possible to provide a plastic bottle that is suppressed and has a wider application range.

Furthermore, according to the configuration in which the density of the body portion is 1.367 g / cm ³ or more and 1.387 g / cm ³ or less, it has both light weight and higher strength against external force, and pressure in the inside. It is possible to provide a plastic bottle that can withstand changes, in particular, a stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Furthermore, according to the structure in which the body portion is cut into 10 mm × 50 mm cut pieces, and the tensile fracture strain at 300 mm / min is 40% or more and 68% or less at 85 ° C. It is possible to provide a plastic bottle that has both high performance and higher strength against external force, can withstand internal pressure changes, particularly stronger negative pressure, and can more reliably suppress deformation even under severe conditions.

  Furthermore, since the filling body according to the present invention is composed of the above-described plastic bottle and the liquid filled at a high temperature, the filling body has both light weight and high strength against external force, and changes in internal pressure, Thus, it is possible to provide a filler that can withstand a strong negative pressure and can suppress deformation even under severe conditions.

  Furthermore, according to the configuration in which the pressure reduction amount of the filler is not less than 1 kPa and not more than 20 kPa, it has both light weight and higher strength against external force, and can withstand internal pressure change, particularly stronger negative pressure. In addition, it is possible to provide a filler that can more reliably suppress deformation even under severe conditions.

  Furthermore, the present invention is a method for producing a filling body in which a plastic bottle molded from a preform having a transparent mouth is filled with a liquid, the plastic bottle comprising a mouth, a shoulder, a trunk, The bottom part, the body part has a constricted part with a narrowed body diameter, the constricted part is an annular circumferential groove and a plastic on one side in the axial direction with respect to the circumferential groove. The shape of the plastic bottle is formed on the other side regardless of the change in the internal pressure, and the pressure absorption part composed of a substantially square panel that deforms in and out of the plastic bottle in response to the change in the internal pressure of the bottle. A step of heating the body of the preform, a step of blow molding a plastic bottle from the preform using a mold, a step of filling the plastic bottle with a high-temperature liquid, and a plastic Bottle mouth A step of attaching a cap to the bottle, a step of sterilizing the mouth and cap of the plastic bottle and a step of cooling the plastic bottle, and a step of blowing cooling air to the plastic bottle in the blow molding step In addition, the preform body is heated to 95 ° C or higher and 135 ° C or lower, and the temperature of the die body is set to 80 ° C or higher and 125 ° C or lower. In addition, it is possible to provide a method for producing a filler that has both high strength against external force, can withstand pressure changes inside, particularly stronger negative pressure, and can suppress deformation even under severe conditions.

  Furthermore, the process of blowing cooling air to the plastic bottle is omitted, and the temperature of the body die is set to 80 ° C. or higher and 115 ° C. or lower, so that it has both light weight and high strength against external force, and changes in internal pressure. In particular, it is possible to provide a method for producing a filler that can withstand a particularly strong negative pressure and that can suppress deformation even under severe conditions.

  Furthermore, since the temperature of the preform body is higher than the temperature of the body mold, it has both lightness and high strength against external force, and withstands internal pressure changes, particularly stronger negative pressure, and is harsh. It is possible to provide a method for producing a filler that can be prevented from being deformed even under conditions.

It is the front view by which the PET bottle as an example of the plastic bottle which concerns on this embodiment was shown. It is a side view of a PET bottle. It is a top view of a PET bottle. 4A is an enlarged view of a groove, FIG. 4A is a front view, FIG. 4B is a cross-sectional view of a central portion, and FIG. 4C is a cross-sectional view of both ends. It is a bottom view of a PET bottle. It is the schematic by which the manufacturing apparatus of the filler which concerns on this embodiment was shown typically. It is sectional drawing by which an example of the heating apparatus of preform was shown. FIG. 2 is a cross-sectional view schematically showing a preform and a PET bottle after blow molding. It is the flowchart by which the outline | summary of the manufacturing process of the filler which concerns on this embodiment was shown. It is the schematic by which an example of spraying of the cooling air to a PET bottle was shown. It is the flowchart by which the outline | summary of the manufacturing process of the filler which concerns on another embodiment was shown. It is a front view of the PET bottle of Comparative Example 1 and Comparative Example 2. It is a front view of the PET bottle of Comparative Example 3.

  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 present 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 present embodiment, and FIG. 2 is a side view of the PET bottle 1. The illustrated PET bottle 1 is a so-called round bottle having a substantially cylindrical shape. The PET bottle 1 has the mouth part 10, the shoulder part 20, the trunk | drum 30, and the bottom part 40 in that 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 PET bottle 1 has an overall height H1 from the bottom 40 to the mouth 10.

  The mouth portion 10 is not of a heat-resistant bottle crystallized until it is colored white by heating in a so-called crystallization apparatus, but is transparent, from the viewpoint of rationalization and speeding up of the manufacturing process of the PET bottle 1 To preferred. The PET bottle 1 is more likely to be deformed under the influence of heat and pressure than a so-called heat-resistant bottle.

  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 has a substantially truncated cone shape that increases in diameter from the upper side to the lower side. It is preferable that the shoulder portion 20 is curved to the outside of the PET bottle 1 in terms of increasing the side wall strength of the PET bottle 1 and increasing the capacity. However, when the mouth portion 10 is gripped and the PET bottle 1 is transported, the shoulder portion 20 may interfere, and the formability when the PET bottle 1 is formed by blow molding is not good. Therefore, it is not preferable that the shoulder portion 20 bends extremely outward, particularly upward.

  FIG. 3 is a top view of the PET bottle 1. Here, referring to FIG. 3, an iris diaphragm-like rib 21 is formed on the shoulder 20 so as to protrude to the outside of the PET bottle 1 in a plan view. The rib 21 has a function of a column with respect to the axial load of the PET bottle 1. And the rib 21 can disperse | distribute the load of the axial direction of the PET bottle 1 to the circumferential direction by being comprised by the shape of an iris diaphragm. Therefore, the iris diaphragm-shaped rib 21 can increase the buckling strength of the PET bottle 1.

  Between the adjacent ribs 21 and 21, a substantially square diaphragm blade-like panel 22 is formed. The diaphragm blade-like panel 22 is configured to be deformable inside and outside the PET bottle 1, particularly inside. Accordingly, the diaphragm blade-like panel 22 has a function of absorbing pressure by being deformed following the change in the internal pressure of the PET bottle 1, particularly the reduced pressure. On the other hand, even when the internal pressure of the PET bottle 1 changes, the structure itself of the shoulder portion 20 is maintained with the rib 21 as a skeleton. As illustrated in FIG. 1 and the like, the side of the diaphragm blade-like panel 22 on the body 30 side is formed in an arc shape curved downward. By configuring the diaphragm blade-like panel 22 in this manner, the axial load of the PET bottle 1 can be absorbed by the lower side of the arc shape. Therefore, the diaphragm blade-like panel 22 can increase the buckling strength of the shoulder portion 20.

  The shoulder portion 20 configured as described above has both light weight and high strength against external force, and can suppress distorted deformation withstanding a pressure change in the inside, particularly a stronger negative pressure. And, for example, when the PET bottle 1 is in a negative pressure state, even if a large force is applied to the shoulder portion 20 due to falling or something hitting the PET bottle 1 from the outside, the shoulder portion 20 is prevented from being dented. can do.

  The trunk portion 30 has a constricted portion 50 with a narrowed trunk diameter at a part thereof. The constricted part 50 can improve the ease of holding the PET bottle 1. Furthermore, it is preferable that the trunk | drum 30 has a cylindrical part with the largest trunk | drum diameter on both sides of the axial direction of the PET bottle 1 on both sides of the constriction part 50, respectively. As a result, even when the PET bottle 1 is turned sideways, each of the cylindrical portions having the largest trunk diameters can be grounded and can be stably placed. For example, the present invention can be applied to a vending machine that loads sideways. . Further, a label can be attached to the cylindrical portion having the largest body diameter.

  The trunk portion 30 illustrated in FIG. 1 and the like includes an upper cylindrical portion 70 that is continuous with the shoulder portion 20, a constricted portion 50 that is continuous with the upper cylindrical portion 70, and a connecting portion 85 that includes ribs such as grooves on the constricted portion 50. And a lower cylindrical portion 80 that is continuous with each other. In the body portion 30, an upper cylindrical portion 70 and a lower cylindrical portion 80 are formed as a cylindrical portion having a maximum body diameter D1. The maximum body diameter D1 is, for example, 68.5 mm. The horizontal cross sections of the upper cylindrical portion 70 and the lower cylindrical portion 80 may not be circular, but may be formed in a polygon that is close to a circle, for example, an octagon or a dodecagon.

  The constricted part 50 has an annular circumferential groove 51, a pressure absorbing part 52 on one side in the axial direction of the PET bottle 1 with respect to the circumferential groove 51, and a reinforcing part 60 on the other side. The constricted portion 50 is formed having an axial length H2. When the length H2 in the axial direction is too short, the constricted portion 50 cannot improve the ease of holding the PET bottle 1 and cannot sufficiently secure the area of the pressure absorbing portion 52, and the length in the axial direction. If H2 is too long, it is difficult to ensure the strength of the PET bottle 1. The constricted portion 50 is a value of the ratio of the axial length H2 of the constricted portion 50 to the total height H1 of the PET bottle 1 (H2 / H1) from the viewpoint of maintaining the strength of the PET bottle 1 while increasing the amount of absorption of the change in internal pressure. Is preferably 0.2 or more and 0.6 or less.

  The circumferential groove 51 is recessed toward the inside in the radial direction of the PET bottle 1, the horizontal cross-sectional shape is circular, and the vertical cross-sectional shape is substantially U-shaped with a flat bottom surface. The circumferential groove 51 can increase the buckling strength of the constricted portion 50. The circumferential groove 51 may have a substantially arc-shaped cross section in the vertical direction, and can be deformed so as to extend in the axial direction even when the PET bottle 1 is taken and transported while being filled with high-temperature contents. Is prevented.

  As illustrated in FIG. 1 and the like, the PET bottle 1 is preferably formed such that the circumferential groove 51 has a minimum body diameter D2. By being configured in this way, stress with respect to the axial load of the PET bottle 1 is concentrated in the circumferential groove 51. At that time, the circumferential groove 51 is deformed to disperse the stress, thereby preventing the specific portion of the PET bottle 1 from being buckled and deformed as a bending point. Therefore, the circumferential groove 51 having the minimum body diameter D2 can increase the buckling strength of the PET bottle 1.

  The value (D2 / D1) of the minimum barrel diameter D2 of the circumferential groove 51 to the maximum barrel diameter D1 of the upper cylindrical portion 70 and the lower cylindrical portion 80 is preferably 0.55 or more and 0.95 or less. More preferably, it is 0.6 or more and 0.8 or less. By adopting such a configuration, the stress with respect to the axial load of the PET bottle 1 is concentrated in the circumferential groove 51 where the diameter of the body portion 30 is minimum, and the buckling strength of the PET bottle 1 is effectively increased. Can do. If the value of the ratio of the minimum body diameter D2 to the maximum body diameter D1 (D2 / D1) is larger than 0.95, the stress with respect to the axial load of the PET bottle 1 is not concentrated on the circumferential groove 51, and so on. For example, the load is applied to the pressure absorbing portion 52. On the other hand, if the value of the ratio of the minimum body diameter D2 to the maximum body diameter D1 (D2 / D1) is less than 0.55, the stress with respect to the axial load of the PET bottle 1 is excessively concentrated in the circumferential groove 51. A sufficient buckling strength cannot be obtained.

  When the depth of the circumferential groove 51 is too shallow, it becomes difficult for stress to be dispersed with respect to the axial load of the PET bottle 1, and the PET bottle 1 is likely to buckle and deform. On the other hand, when the depth of the circumferential groove 51 is too deep, the shapeability at the time of molding of the PET bottle 1 is lowered. The ratio of the depth of the circumferential groove 51 to the minimum body diameter D2 is preferably 0.005 or more and 0.07 or less, and more preferably 0.03.

  Furthermore, even if the width of the circumferential groove 51 is too wide, it becomes difficult for stress to be dispersed with respect to the axial load of the PET bottle 1, and the PET bottle 1 is likely to buckle and deform. On the other hand, even if the width of the circumferential groove 51 is too narrow, the formability during molding of the PET bottle 1 is lowered. The value of the ratio of the width of the circumferential groove 51 to the depth of the circumferential groove 51 is preferably 0.2 or more and 4.0 or less.

  When the PET bottle 1 is formed by blow molding, the circumferential groove 51 can be made thicker by setting it to the inner side in the radial direction of the PET bottle 1. As the circumferential groove 51 is thicker, it can maintain a circular structure without being deformed into an ellipse, for example, when the pressure inside the PET bottle 1 changes, particularly when the pressure is further reduced. Therefore, the thickness of the circumferential groove 51 is preferably 0.15 mm or more and 0.50 mm or less.

  The constricted part 50 has a pressure absorbing part 52 on one side, for example, the lower side in the axial direction with respect to the circumferential groove 51. In the pressure absorbing portion 52 illustrated in FIG. 1 and the like, the body diameter gradually increases from the circumferential groove 51 toward the lower side. The pressure absorption unit 52 has a function of absorbing a pressure change in the inside of the PET bottle 1, particularly a stronger negative pressure, and suppressing an undue deformation of the PET bottle 1. In the configuration in which the area of the pressure absorbing portion 52 is simply enlarged, the strength, particularly the buckling strength, tends to decrease. On the other hand, the PET bottle 1 has a circumferential groove 51 with a narrowed body diameter and a pressure absorbing portion 52 with an enlarged area, thereby sufficiently securing a buckling strength that tends to be insufficient with a round bottle. However, it is configured to absorb more changes in internal pressure.

  The pressure absorbing portion 52 is formed in a cylindrical shape by connecting a plurality of flat panels 53 in the circumferential direction. Each square panel 53 is configured to be deformed into and out of the PET bottle 1 in response to a change in the internal pressure of the PET bottle 1. The pressure absorbing portion 52 illustrated in FIG. 1 and the like has five vertically long rectangular panels 53. Therefore, the cross-sectional shape in the horizontal direction of the pressure absorbing portion 52 is a substantially regular pentagon. Note that a substantially rectangular chamfered portion 54 that is chamfered is formed between the adjacent rectangular panels 53 and 53. The quadrangle panel 53 has a substantially rectangular shape defined by an upper side 55, a lower side 56, and left and right ridge lines 57, 57 in a front view.

  The horizontal cross-sectional shape of the PET bottle 1 has a substantially regular pentagonal shape in the pressure absorbing portion 52, whereas the circumferential groove 51 has a circular shape. Therefore, the PET bottle 1 can be designed so that the circumferential groove 51 is an inscribed circle of the pressure absorbing portion 52. However, the pressure absorbing portion 52 is preferably located on the outer side in the radial direction of the PET bottle 1 than the circumferential groove 51. The PET bottle 1 illustrated in FIG. 2 is configured so as to be located on the outer side in the radial direction of the PET bottle 1 with respect to the circumferential groove 51 also at the center of the upper side 55 of the pressure absorbing portion 52. By configuring the connection portion between the circumferential groove 51 and the pressure absorbing portion 52 in this manner, the deformation of the pressure absorbing portion 52 does not easily reach the circumferential groove 51, and the circular structure of the circumferential groove 51 can be maintained. And it is preferable that the pressure absorption part 52 is located at least 2 mm outside of the circumferential groove 51 in the radial direction of the PET bottle 1 within a range in which the constricted shape is maintained.

  As illustrated in FIG. 1 and the like, the upper side 55 of the rectangular panel 53 is curved in an arc shape toward the upper side. The upper side 55 curved in an arc shape toward the upper side can absorb the load in the axial direction of the PET bottle 1 and increase the buckling strength.

  The lower side 56 is also similar to the upper side 55 in substantially vertical symmetry. That is, as illustrated in FIG. 1 and the like, the lower side 56 is curved in an arc shape toward the lower side. The lower side 56 curved in an arc shape toward the lower side can absorb the axial load of the PET bottle 1 and increase the buckling strength. Further, the lower side 56 may be in contact with the groove bottom of the connecting portion 85. Since the lower side 56 and the connecting portion 85 are in contact with each other, the load applied to the connecting portion 85 is distributed to the lower side 56 and excessive stress concentration on the connecting portion 85 is prevented.

  The ridge line 57 is a boundary line between the rectangular panel 53 and the chamfered portion 54 that are adjacent in the circumferential direction of the PET bottle 1. The ridge line 57 extends between a portion having the maximum body diameter D1 and a portion having the minimum body diameter D2. The ridge 57 has a function as a support for the axial load of the PET bottle 1. If the ridge line 57 is twisted in the circumferential direction of the PET bottle 1 and has an inclination with respect to the axial direction, the function as a support is diminished, and when the negative pressure becomes stronger, the rectangular panel 53 is twisted. It becomes easy to deform. If the rectangular panel 53 is deformed, it will tilt when the PET bottle 1 is installed, resulting in inconvenience in labeling or printing on the PET bottle 1, or a buckling strength when stacked on cardboard. It is not preferable because it becomes impossible. Furthermore, if the ridge 57 has an inclination with respect to the axial direction, the full capacity cannot be increased. Therefore, the ridge line 57 preferably extends in the axial direction without being twisted in the circumferential direction.

  Although illustration is omitted, the pressure absorbing portion 52 may be configured so as not to have the chamfered portion 54 and to directly connect the rectangular panels 53 and 53 adjacent in the circumferential direction. In this case, the boundary line that divides the adjacent quadrangular panels 53, 53 may be configured similarly to the ridge line 57.

  However, the pressure absorbing part 52 preferably has a chamfered part 54. Due to the chamfered portion 54 having a width in the circumferential direction, the load applied to the ridge line 57 from the up and down direction of the PET bottle 1 is dispersed, the excessive concentration of stress on the ridge line 57 is prevented, and the buckling strength can be increased.

  The chamfered portion 54 may be a so-called R chamfered shape that is not a flat surface but is rounded so as to bend outward in the radial direction of the PET bottle 1. The surface curved toward the outside can increase the amount of deformation of the PET bottle 1 in the radial direction. Therefore, the chamfered portion 54 that curves toward the outside absorbs the change in the internal pressure by deforming inward and changing the internal volume when the inside of the PET bottle 1 is particularly depressurized. It plays a part in the function of preventing the deformation.

  As described above, the rectangular panel 53 is configured to be deformable inside and outside the PET bottle 1. Therefore, the rectangular panel 53 has a function of absorbing pressure by deforming following the change in the internal pressure of the PET bottle 1. On the other hand, even when the internal pressure of the PET bottle 1 changes, the structure itself of the pressure absorbing portion 52 is maintained with the upper side 55, the lower side 56, and the left and right ridge lines 57, 57 as the skeleton.

  Inside the PET bottle 1, there is a sudden temperature change when filling the contents, a temperature difference between filling the contents and when the PET bottle 1 is stored, a change in pressure due to changes in the state of the contents such as moisture evaporation and oxidation, etc. Arise. And since the PET bottle 1 reduced in weight becomes thin, it becomes easy to deform | transform under the influence of the change of internal pressure. The rectangular panel 53 configured to be deformable inside and outside the PET bottle 1 is pushed toward the outside of the PET bottle 1 when the internal pressure increases, and is pushed toward the inside of the PET bottle 1 when the internal pressure decreases. Therefore, when the internal pressure of the PET bottle 1 changes, the rectangular panel 53 is deformed inward and outward to change the internal volume, thereby absorbing the change in the internal pressure and preventing the PET bottle 1 from being deformed. It has a function.

  If each area of the rectangular panel 53 is too small, it is difficult to deform and it is difficult to absorb the change in the internal pressure of the PET bottle 1. On the other hand, if each area of the quadrilateral panel 53 is too large, the buckling strength and the side wall strength of the pressure absorbing portion 52 are lowered, and the rigidity of the PET bottle 1 is not sufficient. Furthermore, if the area of each of the quadrangular panels 53 is too large, kinking occurs, and the deformation of the PET bottle 1 is rather increased.

  Here, the distance between the upper side 55 and the lower side 56 of the rectangular panel 53 is defined as the axial length HP of the rectangular panel 53. The ratio of the length HP in the axial direction of the square panel 53 to the total height H1 of the PET bottle 1 from the grounding surface (bottom wall 42) of the bottom 40 to the end of the mouth 10 is 0.06 or more and 0.50. Or less, more preferably 0.40 or less.

  The axial length HP of the rectangular panel 53 is set to a value from as large as possible to as small as possible within a range in which the strength of the PET bottle 1 is maintained while the amount of absorption of the change in internal pressure is increased. It is preferable. Here, the length of the rectangular panel 53 in the axial direction as large as possible is a length that the rectangular panel 53 absorbs most changes in internal pressure while having strength. On the other hand, the fact that the axial length HP of the quadrangular panel 53 is as small as possible is based on a length such that the quadrangular panel 53 absorbs at least changes in internal pressure.

  On the other hand, the distance between the ridges 57 of the square panel 53 is defined as the circumferential width WP of the square panel 53 (see FIG. 2). And it is preferable that the value of ratio of the width WP of the circumferential direction of the square panel 53 with respect to the largest trunk | drum diameter D1 is 0.2 or more and 0.8 or less.

  Note that the aspect ratio between the axial length HP of the quadrangular panel 53 and the circumferential width WP is preferably closer to a square from the standpoint that uniform decompression is possible.

  If the number of the quadrangular panels 53 constituting the pressure absorbing portion 52 increases too much, the area of each quadrangular panel 53 becomes excessively small. And since the square panel 53 which is too small becomes difficult to deform into and out of the PET bottle 1, it becomes difficult to absorb the change in the internal pressure of the PET bottle 1.

  On the other hand, the smaller the number of the rectangular panels 53, the greater the load in the axial direction of the PET bottle 1 on each of the upper side 55 and the lower side 56 and the longer the distance from one end to the other end of each side. If the number of the rectangular panels 53 is too small, each side cannot sufficiently absorb the axial load of the PET bottle 1 and becomes a bending point, and the PET bottle 1 is easily buckled. Become.

  The number of the rectangular panels 53 constituting the pressure absorbing portion 52 is preferably 3 or more and 9 or less, more preferably 5 or more and 7 or less, and more preferably an odd number. preferable. If the rectangular panels 53 are an odd number, they do not face each other. The pressure absorbing portion 52 configured as described above can effectively disperse the load and increase the buckling strength and the side wall strength.

  In addition, it is preferable that the several square panel 53 which comprises the pressure absorption part 52 is made into the same shape from a viewpoint which prevents the stress with respect to the load to the PET bottle 1 concentrating on the specific location of the pressure absorption part 52. FIG.

  The cross-sectional shape of each rectangular panel 53 in the horizontal direction may be a curved shape curved inward in the radial direction of the PET bottle 1, may be a straight shape, or may be a curved shape curved toward the outside. There may be. This is appropriately designed according to the use object of the PET bottle 1.

  For example, the rectangular panel 53 curved inwardly deforms quickly and surely when the internal pressure of the PET bottle 1 decreases to absorb the change in the internal pressure with high responsiveness, but its deformation is relatively small. It is done. On the other hand, when the internal pressure of the PET bottle 1 increases, the amount of deformation can be increased although the responsiveness to absorb the internal pressure change is slightly reduced, and a larger internal pressure change can be absorbed. However, if the amount of deformation is too large, there is a risk of inversion so as to curve outward. If this inversion occurs only in a part of the rectangular panel 53, the appearance is inferior and the commercial value is lowered. In addition, the quadrangle panel 53 curved toward the outside acts in the reverse manner described above.

  The constricted part 50 has a reinforcing part 60 on the other side in the axial direction, for example, on the upper side with respect to the circumferential groove 51. The reinforcing part 60 has a function of maintaining the shape of the body part 30 of the PET bottle 1 in particular, regardless of changes in internal pressure, particularly a stronger negative pressure. That is, the reinforcing portion 60 has a function of preventing the body portion 30 from being deformed radially inward even under severe conditions such that the inside of the PET bottle 1 that is not a heat-resistant bottle is in a stronger negative pressure state. Have.

  In the reinforcing portion 60 illustrated in FIG. 1 and the like, the body diameter gradually increases from the circumferential groove 51 toward the upper side. That is, the reinforcing part 60 is formed in an inverted truncated cone shape. The reinforcing portion 60 is formed with a plurality of reinforcing grooves 61 and 62 that are recessed toward the radially inner side of the PET bottle 1 and extend annularly in the circumferential direction. The reinforcing grooves 61 and 62 both have a circular cross-sectional shape in the horizontal direction and a substantially arc-shaped cross-sectional shape in the vertical direction.

  The reinforcing grooves 61 and 62 may have semi-circular or U-shaped vertical cross-sectional shapes, and even if the PET bottle 1 is taken and transported while being filled with high temperature contents, It is prevented from being deformed so as to extend in the direction.

  The reinforcing grooves 61 and 62 have a reinforcing effect in the radial direction of the PET bottle 1, particularly in the inner direction. The reinforcing grooves 61 and 62 can enhance the function of maintaining the shape of the reinforcing portion 60, particularly the horizontal cross-sectional shape, in a circular shape. Furthermore, by maintaining the shape of the reinforcing portion 60, the body portion 30 also has a horizontal cross-sectional shape, particularly, a substantially regular pentagonal shape at the pressure absorbing portion 52 and a circular shape at other locations.

  In addition, the reinforcement part 60 should just be the structure which can raise the intensity | strength of the radial direction of the PET bottle 1 to such an extent that the horizontal cross-sectional shape of the trunk | drum 30 is maintained especially. As such a configuration, for example, a groove that is discontinuous in the circumferential direction may be used instead of the reinforcing grooves 61 and 62 illustrated in FIG. 1 and the like, and a wave-shaped groove whose width and depth periodically change. But it ’s okay. Furthermore, the cross-sectional shape in the horizontal direction of the reinforcing portion 60 may be a polygon instead of a circle. However, the strength can be improved with a relatively simple configuration. From the viewpoint of balance of shape and force, the reinforcing portion 60 is arranged in the circumferential direction like the reinforcing grooves 61 and 62 illustrated in FIG. A configuration having continuous grooves is preferable. Furthermore, from the viewpoint of strength, the reinforcing portion 60 preferably has, for example, a plurality of annular reinforcing grooves 61 and 62.

  The constricted portion 50 may be configured such that the pressure absorbing portion 52 is disposed on the upper side of the circumferential groove 51 and the reinforcing portion 60 is disposed on the lower side.

  The upper cylindrical part 70 has a cylindrical shape with the same diameter in the vertical direction. The upper cylindrical portion 70 has a discontinuous annular reinforcing groove 73 in which a groove portion 71 recessed toward the radially inner side of the PET bottle 1 and a non-grooved non-groove portion 72 are repeated in the circumferential direction of the PET bottle 1. The expansion and contraction in the axial direction of the PET bottle 1 is suppressed by providing the reinforcing groove 73 having the non-groove portion 72 that is difficult to expand and contract in the axial direction instead of the groove continuous in the circumferential direction of the PET bottle 1. As a result, for example, the PET bottle 1 filled with a high-temperature content exceeding the softening point Tg of PET such as 95 ° C. is easily deformed, and the PET bottle 1 that is not a heat-resistant bottle is taken and conveyed, Even under severe conditions in which the head space is heated and the internal pressure is increased, the head space is prevented from being deformed so as to extend in the axial direction and to reduce the body diameter.

  Further, the reinforcing groove 73 is configured such that the non-grooved portion 72 is disposed between the adjacent groove portions 71 and 71 so that the reinforcing groove 73 does not easily become a bending point with respect to the load from the axial direction of the PET bottle 1. The bending strength can be increased. On the other hand, the reinforcing groove 73 can effectively receive the load from the radial direction of the PET bottle 1 by the configuration having the groove portion 71 and can increase the side wall strength. In particular, in a negative pressure state in which the use of the PET bottle 1 according to the present embodiment is assumed to be stronger, the internal pressure works in a direction that weakens the strength of the PET bottle 1, so that the buckling strength and the side wall strength tend to be insufficient. Will increase. However, the PET bottle 1 can sufficiently increase the buckling strength and the side wall strength by the configuration having the reinforcing groove 73.

  And by increasing the side wall strength of the upper cylindrical portion 70, vendor aptitude, which is a characteristic of whether or not the PET bottle 1 is normally discharged from the vending machine, ease of attaching a label to the upper cylindrical portion 70, The ease of holding the PET bottle 1 is improved. Further, since the reinforcing groove 73 has a non-grooved portion 72 and expands the area of the non-recessed portion of the upper cylindrical portion 70, for example, it becomes difficult to cause poor appearance when a shrink label is attached, and the manufacturing efficiency and label Can improve the display effect (advertising effect).

  The reinforcing grooves 73 exhibit the above-described effects by being provided in at least one row instead of the grooves continuous in the circumferential direction of the PET bottle 1. The second row of grooves from the shoulder 20 side tends to be a bending point because a load that cannot be supported by the first row of grooves is applied to the load from the axial direction of the PET bottle 1. Therefore, when providing one row of reinforcing grooves 73 instead of a plurality of continuous grooves, the second row from the shoulder 20 side is preferable.

  However, it is more preferable that the reinforcing grooves 73 are formed in a plurality of rows, and the non-groove portions 72 in adjacent rows are alternately arranged. By being configured in this way, the above-described effects are more easily exhibited. A plurality of reinforcing grooves 73a, 73b, and 73c are formed in the upper cylindrical portion 70 illustrated in FIG. 1 and the like sequentially from the shoulder 20 side. The non-groove portions 72a and the non-groove portions 72b are alternately arranged, and the non-groove portions 72b and the non-groove portions 72c are alternately arranged. Although both the non-groove portion 72a and the non-groove portion 72c may be arranged shifted in the circumferential direction of the PET bottle 1, stress tends to be biased with respect to the load from the axial direction or the radial direction of the PET bottle 1. Therefore, it is more preferable that they are arranged so as to match in the circumferential direction.

  4 is an enlarged view of the groove 71, FIG. 4A is a front view, FIG. 4B is a cross-sectional view of the central portion 71C, and FIG. 4C is a cross-sectional view of both end portions 71E. It is preferable that the depth of the bottom surface of the groove portion 71 is larger in the central portion 71C than both end portions 71E in the circumferential direction of the PET bottle 1. That is, it is preferable that the groove depth d1 of the central portion 71C is larger than the groove depth d2 of both end portions 71E. The side wall strength of the upper cylindrical portion 70 as a whole can be increased by a configuration in which the depth of the bottom surface of the groove portion 71 is greater at the central portion 71C in the circumferential direction. Thereby, for example, the strength of the portion that comes into contact with the extrusion plate of the vending machine is increased. Furthermore, the step difference from the non-groove portion 72 is eliminated by the configuration in which the depth of the bottom surface of the groove portion 71 is smaller at both end portions 71E than the central portion 71C in the circumferential direction of the PET bottle 1, and the shapeability of the PET bottle 1 is improved. Will improve.

  The reinforcing grooves 73a, 73b, and 73c all have a gear-like cross section in the horizontal direction. On the other hand, the axial cross section at the bottom surface of the groove portion 71 is preferably linear at both circumferential end portions 71E and circular at the central portion 71C. By being configured in this way, when the PET bottle 1 is taken and transported while being filled with high-temperature contents, the force that extends in the axial direction of the PET bottle 1 at the central portion 71C of the groove portion 71 is the both end portions 71E. The expansion and contraction in the axial direction of the PET bottle 1 is suppressed.

  If the depth of the groove portion 71 of the reinforcing groove 73 is too shallow, the side wall strength of the upper cylindrical portion 70 is not increased, and the upper cylindrical portion 70 is liable to be crushed, thereby reducing the suitability of the vendor and the ease of holding the PET bottle 1. End up. On the other hand, when the depth of the groove portion 71 is too deep, the shapeability at the time of molding the PET bottle 1 is lowered, buckling with the groove portion 71 as a base point is likely to occur, and further, the label is difficult to stick. The depth of the groove portion 71 in the central portion 71C in the circumferential direction is preferably 0.005 or more and 0.07 or less in a ratio value with respect to the maximum body diameter D1, which is the diameter of the upper cylindrical portion 70, and is 0.03. More preferably.

  If the width of the groove 71 (the length in the axial direction of the PET bottle 1) is too narrow, the shapeability at the time of molding the PET bottle 1 tends to be lowered. On the other hand, when the width of the groove 71 is too wide, the shrink label attached to the upper cylindrical portion 70 is affected by the unevenness of the groove 71 and is likely to have a poor appearance, which leads to a reduction in purchase motivation. The width of the groove portion 71 is preferably such that the ratio value with respect to the depth of the groove portion 71 is 0.5 or more and 5.0 or less.

  When the length of the groove portion 71 in the circumferential direction of the PET bottle 1 is too short with respect to the non-groove portion 72, the pressure resistance performance of the upper cylindrical portion 70 is reduced, and the PET bottle 1 is not in a state of a stronger negative pressure. The groove 72 is easily bent. On the other hand, when the groove part 71 is too long with respect to the non-groove part 72, the effect of the reinforcement groove | channel 73 mentioned above will no longer be exhibited. Therefore, it is preferable that the ratio of the length in the circumferential direction is 1.5: 1 to 9.5: 1 for the groove 71 and the non-groove 72.

  When the thickness of the non-groove portion 72 is too thin, the pressure resistance performance, the buckling strength, and the side wall strength of the upper cylindrical portion 70 cannot be increased. On the other hand, if the thickness of the non-groove portion 72 is too thick, the boundary between the non-groove portion 72 and the surrounding area becomes a bending point. Therefore, it is preferable that the thickness of the non-groove portion 72 is 0.15 mm or more and 0.50 mm or less.

  Here, as illustrated in FIG. 1 and the like, the upper cylindrical portion 70 is formed with three rows of reinforcing grooves 73a, 73b, and 73c. However, the number is not particularly limited, and is appropriately designed depending on the vertical width of the upper cylindrical portion 70, the depth and width of the groove, and the like.

  The lower cylindrical portion 80 has a cylindrical shape with the same upper and lower diameters. The lower cylindrical portion 80 is formed with a reinforcing groove 81 that is recessed inward in the radial direction of the PET bottle 1 and that extends in an annular shape in the circumferential direction. The reinforcing groove 81 has a circular cross-sectional shape in the horizontal direction and a substantially vertical arc-shaped cross section. The side wall strength of the lower cylindrical portion 80 can be increased by the reinforcing groove 81. And the vendor suitability which is the characteristic of whether the PET bottle 1 is normally discharged | emitted from a vending machine improves by the side wall intensity | strength of the lower cylindrical part 80 improving.

  The reinforcing groove 81 has a substantially arc shape in cross section in the vertical direction, so that the PET bottle 1 is stretched in the axial direction and the body diameter is reduced even when the PET bottle 1 is filled with the high temperature contents. Deformation is prevented.

  As the depth of the reinforcing groove 81 is increased, the side wall strength is increased, while the shapeability of the PET bottle 1 is lowered. If the depth of the reinforcing groove 81 is too shallow, the side wall strength of the lower cylindrical portion 80 is not increased, and the lower cylindrical portion 80 is liable to be crushed, thereby reducing the vendor suitability. On the other hand, when the depth of the reinforcing groove 81 is too deep, the shapeability at the time of molding the PET bottle 1 is lowered, and buckling with the reinforcing groove 81 as a base point easily occurs. The depth of the reinforcing groove 81 is preferably 0.005 or more and 0.07 or less, and more preferably 0.03, with respect to the maximum body diameter D1, which is the diameter of the lower cylindrical portion 80.

  If the width of the reinforcing groove 81 is too narrow, the shapeability at the time of molding the PET bottle 1 tends to be lowered. On the other hand, when the width of the reinforcing groove 81 is too wide, the side wall strength is hardly increased. The ratio of the reinforcing groove 81 to the depth of the reinforcing groove 81 is preferably 0.5 or more and 5.0 or less.

  Here, the configuration in which one reinforcing groove 81 is formed in the lower cylindrical portion 80 is illustrated. However, the number is not particularly limited, and is appropriately designed depending on the vertical width of the lower cylindrical portion 80, the depth and width of the reinforcing groove 81, and the like.

  The lowermost region of the body portion 30 and the lower cylindrical portion 80 is a heel portion 82. When the PET bottle 1 is blow-molded from its original preform (preliminary molded body), the heel portion 82 has a long distance from the bottom of the preform, and the stretch ratio increases accordingly. It is a place that tends to turn white and sometimes white.

  The connecting portion 85 is preferably a circumferential groove that is recessed inward in the radial direction of the PET bottle 1 and extends annularly in the circumferential direction. By using the connecting portion 85 as a circular groove, the strength of the side wall in the vicinity of the connecting portion 85 can be increased. The connecting portion 85 has a circular cross-sectional shape in the horizontal direction and a substantially U-shaped cross-sectional shape in the vertical direction having a flat bottom surface. The connecting portion 85 may have a substantially arc-shaped cross section in the vertical direction, and can be deformed so as to extend in the axial direction even when the PET bottle 1 is taken and transported while being filled with high temperature contents. Is prevented.

  If the depth of the connecting portion 85 is too shallow, the side wall strength cannot be increased, and the vendor suitability is lowered. On the other hand, if the depth of the connecting portion 85 is too deep, the shapeability at the time of molding the PET bottle 1 is lowered. The depth of the connecting portion 85 is preferably 0.005 or more and 0.07 or less, and more preferably 0.03, with respect to the minimum body diameter D2.

  If the width of the connecting portion 85 is too wide, the side wall strength cannot be increased, and the vendor suitability is lowered. On the other hand, when the width of the connecting portion 85 is too narrow, the shapeability at the time of molding the PET bottle 1 is lowered. The width of the connecting portion 85 is preferably such that the value of the ratio to the depth of the connecting portion 85 is not less than 0.5 and not more than 5.0.

  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 80 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 dome 43 protrudes from the bottom wall 42 toward the inside (upper side) 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 when positive pressure is applied in a state where the bottom 40 is easily deformed by heat. As a result, the full capacity of the PET bottle 1 can be increased and the change in internal pressure can be prevented from becoming larger. 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. Thus, the bottom portion 40 is prevented from projecting outward (downward) from the bottom wall 42, and rattling or overturning of the PET bottle 1 can be prevented.

  As described above, the PET bottle 1 has the mouth portion 10, the shoulder portion 20, the trunk portion 30, and the bottom portion 40, and the trunk portion 30 is partially constricted with the neck diameter 50 reduced. The constricted portion 50 has an annular circumferential groove 51 and a rectangular panel that deforms inward and outward of the PET bottle 1 in response to a change in the internal pressure of the PET bottle 1 on one side in the axial direction with respect to the circumferential groove 51. The pressure absorption part 52 comprised by 53 is continued in the circumferential direction, and it has the reinforcement part 60 which maintains the shape of the PET bottle 1 on the other side irrespective of the change of internal pressure. Furthermore, the trunk | drum 30 has the reinforcement groove | channel 73 in which the groove part 71 and the non-groove part 72 are repeated in the circumferential direction of the PET bottle 1.

  In the PET bottle 1 according to the present embodiment, even if it is reduced in weight, it can sufficiently withstand the load from the axial direction and the waist direction, absorb the change in the internal pressure, and the shoulder 20 and the recess of the trunk 30, Deformation such as flatness and kinking is sufficiently suppressed. Therefore, according to the present embodiment, a PET bottle that has both light weight and high strength against external force, can withstand pressure change inside, particularly stronger negative pressure, and can suppress distorted deformation even under severe conditions. 1 can be provided.

  The PET bottle 1 according to this embodiment 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 2000 ml or less. The total height H1 of the PET bottle 1 may be 100 mm or more and 300 mm or less, and the maximum body diameter D1 of the body part 30 may be 30 mm or more and 80 mm or less. Furthermore, the PET bottle 1 according to the present embodiment can be suitably used for light weight bottles. The mass of the PET bottle 1 may be, for example, 20 g or more and less than 40 g for 1000 ml, and 15 g or more and less than 30 g for 500 ml. In particular, from the viewpoint of maintaining the strength of the PET bottle 1 while having lightness and increasing the absorption amount of the change in internal pressure, the value of the ratio of the mass to the volume of the PET bottle 1 is 0.0392 g / ml or more, 0 It is preferably 0.0600 g / ml or less.

  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 can be produced by blow-molding a preform in which the above-described material is injection-molded. However, the PET bottle 1 as an example of the plastic bottle according to the present embodiment also supports a severe situation. For this reason, the PET bottle 1 according to the present embodiment is applied to a hot pack implant which is a manufacturing method in which all processes such as molding of a PET bottle 1 from a preform and filling of a high-temperature beverage into the PET bottle 1 are performed in an in-line manner. It can also be applied.

  Next, the manufacturing apparatus of the filling body which concerns on this embodiment with which such a hot pack implant was embodied is demonstrated in detail. FIG. 6 is a schematic view schematically showing the manufacturing apparatus 100 for the filler 8 according to the present embodiment. The manufacturing apparatus 100 for the filling body 8 according to the present embodiment includes a heating unit that heats the body of the preform 5, a molding unit that blow-molds the PET bottle 1 from the preform 5 using a mold, and the PET bottle 1. A filling portion for filling a high temperature liquid, a mounting portion for attaching the cap 7 to the mouth portion 10 of the PET bottle 1, a tip sterilizing portion for tipping and sterilizing the mouth portion 10 and the cap 7 of the PET bottle 1, and a PET bottle. 1 is provided. And the manufacturing apparatus 100 of the filling body 8 which concerns on this embodiment is an in-line system as for the apparatus which shape | molds the PET bottle 1 from the preform 5 which is a preformed body, the apparatus which fills the PET bottle 1 with a high temperature liquid, etc. It is characterized by comprising.

  Here, the in-line method may be a synchro method in which the molding part and the filling part are connected, or may be a separate type in which the PET bottle 1 is conveyed by air by separating the molding part and the filling part. Furthermore, in the manufacturing apparatus 100 of the filling body 8 according to the present embodiment, the various apparatuses configured in an in-line method may include an injection molding apparatus that forms the preform 5.

  The bottle molding machine 110 includes a heating device 111 as a heating unit and a biaxial stretch blow molding device 112 as a molding unit. When the preform 5 is formed into a bottle shape, the preform 5 is first heated.

  FIG. 7 is a cross-sectional view showing an example of the heating device 111 of the preform 5. FIG. 7 shows a cross section perpendicular to the conveying direction of the preform 5.

  The heating device 111 includes a transport device 113 and a heater 114. The transport device 113 is configured to transport the preform 15 while rotating around the axis of the preform 5 in order to uniformly heat the body portion 15 of the preform 5 in the circumferential direction. The heater 114 includes a plurality of halogen lamps, for example, and is configured to heat the body portion 15 of the preform 5 at a temperature suitable for blow molding, for example, 95 ° C. or more and 135 ° C. or less. Furthermore, the heating device 111 is used to prevent the heat from the heater 114 from being reflected to the body portion 15 of the preform 5 and the heat from the heater 114 to the outside of the heating device 111. A shielding member 116 or the like may be provided. In addition, in the heating apparatus 111 of FIG. 7, the preform 5 is conveyed and heated in a state where the mouth portion 10 faces downward.

  FIG. 8 is a cross-sectional view schematically showing the preform 5 and the PET bottle 1 after blow molding. The biaxial stretch blow molding device 112 includes a mold 117, a stretch rod 118, an air supply device (not shown), and a control device that controls them. In addition, although the biaxial stretch blow molding apparatus 112 of the downward blow molding method is illustrated in FIG. 8, an upward blow molding method in which the material is hardly affected by gravity may be used.

  The mold 117 has a shape corresponding to the PET bottle 1 to be formed, and includes, for example, a body mold 117 a configured in half corresponding to the body section 30, and a bottom mold 117 b corresponding to the bottom section 40. Have The surface temperature of the body die 117a is controlled to be, for example, 80 ° C. or higher and 125 ° C. or lower, preferably 90 ° C. or higher and 120 ° C. or lower, more preferably 90 ° C. or higher and 115 ° C. or lower. On the other hand, the temperature of the surface of the bottom mold 117b is configured to be controlled to 5 ° C. or higher and 30 ° C. or lower. The surface temperature of the body die 117a exceeds the glass transition point (Tg) of polyethylene terephthalate.

  By setting the surface temperature of the mold 117 to 120 ° C. or less, the material of the mold 117 is, for example, stainless hardened and tempered steel having a large weight and a large work load for handling, or a steel for molds. Instead, aluminum can be used. By using aluminum, the metal mold 117 can be easily processed, the degree of design freedom is increased, and the manufacturing cost can be reduced. In addition, since the weight of the mold 117 is reduced, the mold replacement work is facilitated.

  The body die 117 a preferably has a rough surface portion 117 </ b> R that has been subjected to a roughing process (rough surface processing) at least at a part of its surface, more specifically at a location that contacts the heel portion 82 of the PET bottle 1. The method for forming the rough surface portion 117R is not particularly limited, and may be a physical treatment method such as sand blasting or polishing treatment, or a chemical treatment method such as etching. The heel portion 82 is a portion that is generally difficult to mold. This is particularly noticeable at the heating temperature of the preform 5 and the temperature of the surface of the body die 117a set in the manufacturing apparatus 100 for the filling body 8 according to this embodiment. However, by providing the rough surface portion 117R at the place where it comes into contact with the heel portion 82, the mold release is improved and the local excessive shrinkage is prevented, and as a result, the shapeability of the PET bottle 1 is improved. .

  A concave receiving portion 117c is preferably formed at the center of the bottom mold 117b. The receiving portion 117c is configured such that the tip of the stretching rod 118 enters. The receiving portion 117 c has a function of preventing the bottom portion 18 from being eccentric in the radial direction when the preform 5 is stretched by the stretching rod 118.

  The stretching rod 118 is configured to be extendable and contractible inside the mold 117. And the extending | stretching rod 118 is comprised so that the trunk | drum 15 of the preform 5 in which the opening | mouth part 10 was attached to the metal mold | die 117 may be extended | stretched in a vertical (axial) direction. The air supply device is configured to blow out air P whose pressure and temperature are adjusted. The air P may be supplied to the inside of the preform 5 attached to the mold 117, may be blown from the stretching rod 118, or may be blown from a member different from the stretching rod 118. The air P is configured to extend the body portion 15 of the preform 5 in the lateral (diameter) direction. The air P blown out from the stretching rod 118 lowers the surface temperature of the body portion 15 and rapidly cools it, and improves the heat resistance.

  As shown in FIG. 6, the hot filling machine 120 includes a filler 121 as a filling portion and a capper 122 as a mounting portion. The filler 121 may be used to inject the hot liquid sterilized contents such as the beverage 6 into the PET bottle 1 at a high temperature, for example, 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. It is configured. The capper 122 as the mounting portion is configured to mount the cap 7 on the mouth portion 10 of the PET bottle 1 filled with the beverage 6. The PET bottle 1 is hermetically sealed with a cap 7 that is attached to form a filling body 8.

  The overturning sterilizer 130 as the overturning sterilization unit tilts the filling body 8 for a predetermined time, for example, 90 seconds or more for 30 seconds, and heats the hot beverage 6, so that the inside of the filling body 8, particularly the mouth of the PET bottle 1 It is comprised so that the part 10 and the cap 7 may be disinfected. The sterilization time is appropriately designed according to the type of beverage 6 and the temperature.

  The path riser 140 as a cooling unit includes, for example, four thermostats for storing water at a plurality of temperatures as a heat exchange liquid, and a jet outlet such as a nozzle. After the pasterizer 140 sprays hot water such as 65 ° C. and heats and sterilizes the filling body 8 from the outside, the temperature of the sprayed water is lowered stepwise, and in the final stage, low temperature water such as 30 ° C. The filler 8 (PET bottle 1) is cooled by spraying water. Cooling by the path riser 140 has an effect of preventing a change in the flavor of the beverage 6 filled in the filling body 8. The temperature of the liquid stored in the first tank of the path riser 140 is preferably 65 ° C. or lower. By rapidly cooling the filler 8 at 65 ° C. or less, damage to the body 30 of the PET bottle 1 due to heat can be reduced.

  The manufacturing apparatus 100 of the filling body 8 includes a labeler, a caser 150, a printing apparatus, an inspection apparatus, and the like as a subsequent stage of these apparatuses. The labeler attaches a label to the filler 8 (PET bottle 1). The caser packs the filling body 8 in a cardboard every predetermined number, for example, 24 pieces. The packing body 8 which concerns on this embodiment is manufactured using the apparatus etc. which were mentioned above.

  Next, the manufacturing method of the filler 8 according to the present embodiment will be described in detail. FIG. 9 is a flowchart showing an outline of the manufacturing process of the filler 8 according to this embodiment. In the present embodiment, at least the step of heating the body portion 15 of the preform 5, the step of blow-molding the PET bottle 1 from the preform 5 using the mold 117, and filling the PET bottle 1 with the high-temperature beverage 6. A step, a step of attaching the cap 7 to the mouth portion 10 of the PET bottle 1, a step of sterilizing the mouth portion 10 of the PET bottle 1 and the cap 7, and a step of cooling the PET bottle 1. The present embodiment is characterized in that all processes such as molding of the PET bottle 1 from the preform 5 and filling of the high-temperature beverage 6 into the PET bottle 1 are performed in an in-line manner. Below, each process is demonstrated in detail.

  First, the preform 5 is supplied to the bottle molding machine 110 (step S1). In the method for manufacturing the filler 8 according to the present embodiment, the preform 5 in which the mouth portion 10 is in an amorphous state is used. However, the opening end side of the mouth portion 10 may be heat-treated at, for example, about 160 ° C. to 180 ° C. and partially crystallized. The supplied preform 5 is conveyed after being aligned.

  As described above, the manufacturing apparatus 100 for the filling body 8 according to this embodiment may include an injection molding apparatus, a compression molding apparatus, a compression injection molding apparatus, and the like that form the preform 5 configured in an in-line manner. good. In this case, the preform 5 supplied to the bottle molding machine 110 is formed by an in-line method using an injection molding apparatus. The preform 5 is supplied to the bottle molding machine 110 by a cold parison method, a hot parison method, and an inline method.

  Next, the preform 5 is heated (step S2). The body portion 15 of the preform 5 conveyed to the heating device 111 of the bottle molding machine 110 is heated by a plurality of heaters 114 to a temperature of 95 ° C. or more and 135 ° C. or less, for example.

  When the temperature of the preform 5 to be heated is less than 95 ° C., the heat resistance is insufficient, and the PET bottle 1 molded thereafter cannot cope with hot filling to fill the high temperature contents, It transforms into an irregular shape. On the other hand, when the temperature of the preform 5 to be heated exceeds 135 ° C., the preform 5 before bottle molding is excessively crystallized and blow molding cannot be performed. In that respect, if the temperature of the preform 5 to be heated is 135 ° C. or less, crystallization proceeds somewhat, but blow molding is possible.

  Next, blow molding of the PET bottle 1 is performed by stretching the preform 5 (step S3). The heated preform 5 is mounted on the mold 117 of the biaxial stretch blow molding apparatus 112. In the manufacturing method of the filling body 8 according to the present embodiment, the surface temperature of the body die 117a is 80 ° C. or higher and 125 ° C. or lower, preferably 90 ° C. or higher and 120 ° C. or lower, more preferably 90 ° C. or higher and 115 ° C. or lower. It is said. By setting the temperature within this range, the outer surface of the PET bottle 1, in particular, the body portion 30 is crystallized to have a heat resistant structure. Therefore, the PET bottle 1 that can be filled with the high-temperature beverage 6 in the subsequent process can be produced. When the surface temperature of the body mold 117a is less than 80 ° C., the heat resistance is low. On the other hand, when the surface temperature of the body mold 117a exceeds 125 ° C., the PET bottle 1 is connected to the body mold 117a. Initial contraction upon contact with the surface increases and deformation, that is, sink marks are likely to occur.

  Here, in the present embodiment, the effect is realized when the temperature of the preform 5 to be heated and the temperature of the surface of the body die 117a both exceed a certain level. The temperature of the body portion 15 of the preform 5 is more preferably higher than the temperature of the surface of the body mold 117a. If the temperature of the body portion 15 is higher than the temperature of the surface of the body mold 117a, the above-described initial shrinkage hardly occurs.

  First, the body portion 15 of the preform 5 attached to the mold 117 is stretched in the longitudinal direction by the stretching rod 118. When the preform 5 is stretched, the bottom 18 tends to be eccentric as the temperature increases. If the film is eccentric and stretched, it tends to be deformed in the shifted direction, which is not preferable. However, when the receiving portion 117c provided at the center of the bottom mold 117b guides the tip of the stretching rod 118 to the center, the preform 5 can be eccentrically stretched even if its temperature is set high. Is prevented.

  In this case, the longitudinal stretching ratio from the preform 5 to the PET bottle 1 is preferably 1.8 or more and 4.0 or less. Here, the longitudinal draw ratio is a value (H4 / H3) of the ratio of the height H4 (see FIG. 8) of the trunk 30 of the PET bottle 1 to the height H3 (see FIG. 8) of the trunk 15 of the preform 5. ). The molecules of the preform 5 having an amorphous structure that is an aggregate of an amorphous part and a crystalline part undergo orientational crystallization by stretching, and as a result, the strength, rigidity, and heat resistance of the PET bottle 1 are increased. Therefore, the PET bottle 1 that can be filled with the high-temperature beverage 6 in the subsequent process can be produced. When the longitudinal stretching ratio is less than 1.8, the molecular orientation of the preform 5 does not increase, whereas when the longitudinal stretching ratio exceeds 4.0, the PET bottle 1 becomes difficult to mold.

  Further, the air P adjusted in pressure and temperature is blown out from the air supply device and supplied into the preform 5. First, the body 15 of the preform 5 is stretched in the lateral direction so as not to hit the body mold 117a by the low-pressure air P1 of, for example, 5 bar or more and 16 bar or less supplied along with the stretching of the preform 5 in the longitudinal direction. (Pre-blow). Thereafter, the body portion 15 of the preform 5 is stretched in the lateral direction by high pressure air P2 of, for example, 20 bar or more and 38 bar or less in about 0.5 to 1.5 seconds until it hits the body mold 117a.

  In this case, the transverse stretch ratio from the preform 5 to the PET bottle 1 is preferably 1.8 or more and 3.0 or less. Here, the transverse stretch ratio is the outer diameter (maximum trunk diameter D1) of the trunk 30 of the PET bottle 1 with respect to the outer diameter D3 (see FIG. 8) of the trunk 15 of the preform 5 (see FIGS. 1 and 8). ) Ratio value (D1 / D3). The molecules of the preform 5 are similarly oriented and crystallized by stretching in the transverse direction. As a result, the strength, rigidity, and heat resistance of the PET bottle 1 are increased. Therefore, the PET bottle 1 that can be filled with the high-temperature beverage 6 in the subsequent process can be produced. When the transverse draw ratio is less than 1.8, the molecular orientation of the preform 5 does not increase. On the other hand, when the transverse draw ratio exceeds 3.0, the PET bottle 1 becomes difficult to mold.

  In order to prevent the body portion 30 of the PET bottle 1 from being crystallized excessively and becoming difficult to stretch, it is determined in advance until the preform 5 is stretched into the shape of the PET bottle 1 after being mounted on the mold 117. It is controlled to fit in time.

  In the manufacturing method of the filling body 8 according to the present embodiment, cooling air may be further sprayed onto the PET bottle 1 during the blow molding process (step S4). FIG. 10 is a schematic view illustrating an example of spraying the cooling air C <b> 1 onto the PET bottle 1.

  The PET bottle 1 biaxially stretched and blow-molded sticks to the mold 117 of the biaxially stretched blow molding device 112. Then, the stretching rod 118 is disposed inside the mold 117 and the PET bottle 1. The stretching rod 118 is provided with a cooling air blowing portion 119. The cooling air blowing unit 119 communicates with the air supply device, and is configured to blow out high-pressure cooling air C1 whose pressure and temperature are adjusted. By providing the cooling air spraying part 119, it is possible to improve the deformation due to the initial contraction when the PET bottle 1 comes into contact with the body mold 117a. The pressure of the cooling air C1 may be the same as that of the high-pressure air P2, and the blowing time of the cooling air C1 may be about 1/20 to 1/3 that of the high-pressure air P2. More specifically, the time for blowing the cooling air C1 is 0.05 seconds to 0.6 seconds and 1% to 90%, more preferably 5% to 30% of the time of the high pressure air P2. It is preferable.

  A vent hole is formed in the stretching rod 118 in the radial (lateral) direction, and the cooling air C <b> 1 is blown in a direction substantially perpendicular to the inner surface of the body portion 30 of the PET bottle 1. As soon as the body 30 of the PET bottle 1 touches the body mold 117a, the shrinkage starts. When the cooling air C1 is blown there, the body part 30 is pressed in the direction of the body mold 117a to suppress deformation thereof, and heat resistance is imparted to the body part 30. Accordingly, the body 30 of the PET bottle 1 that is blow-molded and in a high-temperature state is further accelerated in crystallization by being sprayed with the cooling air C1. The temperature of the cooling air C1 is preferably 1 ° C. or higher and 30 ° C. or lower. When the temperature of the cooling air C1 is less than 1 ° C., a temperature distribution is generated in the body part 30 and distortion is likely to occur. On the other hand, when the temperature of the cooling air C1 exceeds 30 ° C., the body part 30 Becomes difficult to cool, and its heat resistance decreases.

  As another method, the high pressure air P2 blown from the stretching rod 118 may be switched to the cooling air C1 step by step. This method also promotes crystallization of the body portion 30 of the PET bottle 1. Of the step of blowing the high-pressure air P2 in the blow molding, the ratio of the cooling air C1 may be gradually increased from the end stage, for example, from 1% to 90%, more preferably from 5% to 30%. In addition, when the time is too short, the effect by this method becomes difficult to appear, and when the time is too long, the crystallization of the body portion 30 is difficult to be promoted.

  In addition, it is preferable to spray the cooling air C1 also on the outer surface side of the trunk portion 30 of the PET bottle 1. By doing so, crystallization is also promoted on the outer surface side of the body portion 30 of the PET bottle 1. The cooling air C1 may be sprayed onto the outer surface of the body 30 after the mold 117 is opened, or may be continued until the next process is started.

  As described above, the cooling air C1 is blown onto the body part 30 of the PET bottle 1, whereby heat resistance can be imparted to the body part 30 while effectively suppressing the shrinkage of the body part 30. The surface temperature of the PET bottle 1 can be quickly lowered to reduce the speed required for producing the PET bottle 1. Furthermore, when the cooling air C1 is sprayed onto the body 30 of the PET bottle 1, the shrinkage of the body 30 can be effectively suppressed, so that the surface temperature of the body mold 117a is, for example, 125 ° C. Can be set higher. Therefore, by spraying the cooling air C1, crystallization can be further promoted, and the PET bottle 1 having higher temperature heat resistance can be produced.

  Here, the main raw material polyethylene terephthalate constituting the PET bottle 1 has a mixture of a crystal region portion (crystal portion) where the molecular chain is crystallized and an amorphous region portion (amorphous portion) where the crystal chain is not crystallized. . When polyethylene terephthalate is heat-treated at a glass transition temperature of about 70 ° C. or higher where the amorphous part has fluidity and at a melting point of about 260 ° C. or less, particularly about 140 ° C. to 160 ° C. at which the crystal part also flows, This has the property of increasing the proportion of crystal parts. Such a crystal part with respect to the sum of the crystal part and the amorphous part is called crystallinity. And, the higher the crystallinity, the stronger the intermolecular force, so that the heat resistance is improved.

  Note that since the crystal part has a higher density than the amorphous part, the higher the crystallinity, the higher the density. That is, polyethylene terephthalate has the property that heat resistance increases as the density increases. Furthermore, since the amorphous part and the crystalline part have different refractive indexes, scattering occurs at these boundaries. Therefore, as the crystalline part increases, light is more likely to be scattered, resulting in haze (of the transmitted light in the visible light region). The percentage of scattered light). That is, polyethylene terephthalate has a characteristic that heat resistance increases as haze increases.

  The crystallinity of the body 30 of the PET bottle 1 is preferably 25% or more and 45% or less, and more preferably 25% or more and 39% or less. If the crystallinity is within this range, the heat-resistant PET bottle 1 can be molded from the preform 5 with good formability. The crystallinity of the body 30 of the PET bottle 1 can be derived from the density. In addition, the crystallinity of the body 30 of the PET bottle 1 can be evaluated by Raman spectroscopic analysis.

The density of the trunk portion 30 of the PET bottle 1 produced by the method for producing the filler 8 according to the present embodiment is 1.367 g / cm ³ or more and 1.387 g / cm ³ or less. The density of the body part 30 of the PET bottle 1 can be measured by a specific gravity method, for example, a density gradient tube method, using a cut piece obtained by cutting a part of the body part 30 in, for example, 1 cm square as a sample. Whether or not the method for manufacturing the filling body 8 according to the present embodiment has been used by measuring the density of the body portion 30 of the PET bottle 1 in the filling body 8 manufactured by the manufacturing apparatus 100 configured in an in-line manner. Can be determined.

  Furthermore, the tensile fracture strain of the trunk portion 30 of the PET bottle 1 manufactured by the method for manufacturing the filler 8 according to the present embodiment is 40% or more and 68% or less.

  As a method for measuring the tensile fracture strain of the barrel 30 of the PET bottle 1, a cut piece in which a portion of the barrel 30 is cut into, for example, a short side of 10 mm x a long side of 50 mm is used as a sample. One of the extending samples is fixed and pulled in the long side direction at 85 mm and 300 mm / min. And the tensile fracture distortion of the trunk | drum 30 of PET bottle 1 can be investigated by measuring what percentage cuts when it pulls. Whether or not the method for manufacturing the filling body 8 according to the present embodiment has been used by measuring the tensile fracture strain of the body portion 30 of the PET bottle 1 in the filling body 8 manufactured by the manufacturing apparatus 100 configured in an in-line method. Can be determined. Here, the maximum load shown when the sample is cut is the tensile strength, and the value divided by the cross-sectional area is the tensile stress.

  The blow-molded PET bottle 1 moves away from the mold 117. In the manufacturing method of the filling body 8 according to the present embodiment, since it is an in-line method, the time for blow molding is shortened as much as possible, and the PET bottle 1 is likely to shrink. However, since the rough surface portion 117R of the body die 117a has been subjected to a squeezing process, the rough surface portion 117R and the heel portion 82 are in contact with each other instead of a solid surface, and the heel portion 82 contracts inward. There is no sinking without undulation. Therefore, the shapeability of the PET bottle 1 can be improved. Furthermore, in the manufacturing method of the filling body 8 which concerns on this embodiment, the time of manufacture can be shortened compared with a heat-resistant bottle, manufacturing efficiency can be raised and manufacturing cost can be reduced.

  The surface roughness (Ra) of the heel portion 82 of the PET bottle 1 manufactured by the method for manufacturing the filler 8 according to the present embodiment is 0.3 μm or more and 3 μm or less. With this level of surface roughness, it is possible to maintain the characteristics of being transparent while having heat resistance. As an index of the surface roughness of the heel portion 82, for example, the arithmetic average roughness Ra can be used. As a method for measuring the arithmetic average roughness Ra, it can be examined by analyzing an image of three-dimensional data obtained by a laser microscope. By measuring the surface roughness of the body portion 30 of the PET bottle 1, particularly the heel portion 82, in the filling body 8 produced by the in-line manufacturing apparatus 100, the method for producing the filling body 8 according to the present embodiment. It can be determined whether or not is used.

  Next, as shown in FIG. 9, the PET bottle 1 is supplied to the hot filling machine 120 (step S5). Since the manufacturing apparatus 100 for the filling body 8 according to the present embodiment is configured in an in-line manner, the molded PET bottle 1 is promptly supplied to the hot filling machine 120. The supplied PET bottle 1 is sequentially delivered by, for example, a gripper attached to the outer peripheral portion of each of a plurality of rotating disc-shaped transport wheels, and is carried to the filler 121. The conveyance of the PET bottle 1 is preferably a method in which the mouth portion 10 is gripped by a gripper in terms of speeding up the production of the filler 8. In addition, it is preferable that the time until the hot bottle filling machine 120 is supplied after molding the PET bottle 1 is within 10 seconds. Thus, since the manufacturing method of the filling body 8 which concerns on this embodiment is an in-line system, the PET bottle 1 is used for filling of the drink 6 in the state with little heat resistance fall by humidification.

  On the other hand, the hot filling machine 120 performs the heat sterilization of the beverage 6 filled in the PET bottle 1 (step S6). The heat sterilization is appropriately set at a predetermined temperature and a holding time such as 4 minutes at 120 ° C. or 30 minutes at 85 ° C. according to the characteristics of the beverage 6, such as acidity and water activity. .

  Then, the beverage 6 is filled into the PET bottle 1 in the filler 121 of the hot filling machine 120 (step S7). The filler 121 injects the hot liquid sterilized contents such as the beverage 6 into the PET bottle 1 as it is at a high temperature, for example, 71 ° C. or more and 95 ° C. or less, more preferably 81 ° C. or more and 90 ° C. or less. Similarly, the PET bottle 1 filled with the beverage 6 is sequentially delivered by the gripper and carried to the capper 122.

  The PET bottle 1 manufactured by the method according to the present embodiment does not have heat resistance as much as when the temperature of the body die 117a widely used as hot filling is molded at 160 ° C. or higher. . However, the PET bottle 1 has sufficient heat resistance to be filled with the high-temperature beverage 6 having the above-described temperature range, for example, 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. It is produced. And in the manufacturing method of the filling body 8 which concerns on this embodiment, the method with which the drink 6 is filled at the time of maintaining the most heat resistance immediately after the PET bottle 1 was shape | molded is used. Therefore, according to the manufacturing method of the filling body 8 which concerns on this embodiment, the high temperature drink 6 can be filled into the PET bottle 1 without a problem.

  In this way, the PET bottle 1 can be filled with the hot beverage 6. For this reason, for example, the inner surface of the PET bottle 1 can be sufficiently sterilized with a high-temperature beverage 6 of 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. And since the risk of the growth of aerobic bacteria is extremely low even if oxygen is enclosed together with the beverage 6 in the filling body 8 by performing sufficient sterilization, the beverage 6 is not necessarily filled to the PET bottle 1 fully. It doesn't matter. Therefore, according to the method according to the present embodiment, it is possible to effectively prevent the growth of bacteria on the outer surface of the PET bottle 1 that is more likely to occur as the filling is full.

  In addition, as mentioned above, in the manufacturing method of the filling body 8 which concerns on this embodiment, since blow molding of the PET bottle 1 and filling of the drink 6 to the PET bottle 1 are performed by an in-line system, PET bottle No. 1 is maintained in a high heat resistance state. However, from the viewpoint of further maintaining the heat resistance of the PET bottle 1, at least the PET bottle 1 is blow-molded in the manufacturing apparatus 100 of the filling body 8 and then the beverage 6 is filled into the PET bottle 1. It is even better if the PET bottle 1 is held in an environment of a predetermined humidity or less, preferably 40% or less in a region until it is opened.

  Next, the cap 7 is supplied to the capper 122 of the hot filling machine 120 (step S8). In addition, although the cap 7 may be sterilized by, for example, ultraviolet irradiation, in the method for manufacturing the filling body 8 according to the present embodiment, the cap 7 is not sterilized before the beverage 6 is filled. There may be. In addition, by sterilizing the cap 7, the filling temperature of the beverage 6 and the temperature of the path riser 140 can be lowered, and the heat resistance of the PET bottle 1 that is required when the filling body 8 is manufactured can be lowered. it can.

  Then, the cap 122 is attached to the PET bottle 1 in the capper 122 (step S9). Thereby, the filling body 8 according to the present embodiment is formed. In addition, it is preferable to perform the process so far, for example in the space where management is performed about clean conditions like an aseptic area | region, and environmental conditions, such as temperature and humidity. The formed filling body 8 is carried to the overturning sterilizer 130 by a transport belt such as a conveyor.

  Next, the filling body 8 is sterilized by overturning by the overturning sterilizer 130 (step S10). The overturning sterilizer 130 conveys the filler 8 while lying down, for example. When the filling body 8 is overturned, the cap 7 and the inner surface of the PET bottle 1, particularly in the vicinity of the mouth 10, are sterilized by coming into contact with the hot beverage 6.

  Subsequently, the filling body 8 is cooled by the path riser 140 (step S11). As described above, the temperature of the liquid stored in the first tank of the path riser 140 is preferably 65 ° C. or less. By rapidly cooling the filler 8 at 65 ° C. or less, damage to the mouth 10 of the PET bottle 1 due to heat can be reduced. After that, the liquid temperature of the beverage 6 inside the filling body 8 is lowered stepwise by the second and subsequent tanks of the paste riser 140, and finally cooled until it reaches room temperature.

  After that, the label is attached to the filling body 8 by the labeler and the caser 150 and then packed in a cardboard box. The filler 8 according to this embodiment is manufactured by the above method.

  As described above, the filling body 8 is sold in a state of being filled with a high-temperature beverage 6 such as 85 ° C. and cooled to 5 ° C. And in the inside of PET bottle 1, it will be in the state of a stronger positive pressure at the time of mounting | wearing with the cap 7 from filling of the drink 6, and will be in the state of a stronger negative pressure after cooling. Moreover, since the PET bottle 1 is not a so-called heat-resistant bottle, it is easily deformed under the influence of heat and pressure. Therefore, when the PET bottle 1 and the filling body 8 are manufactured, unless design is performed with the expectation of deformation, variations in products cannot be suppressed and the quality cannot be maintained high. However, the PET bottle 1 and the filling body 8 filled with the beverage 6 have both the light weight and the high strength against the external force due to the configuration including the circumferential groove 51, the reinforcing portion 60, the reinforcing groove 73, and the like. In addition, it can withstand internal pressure changes, especially stronger negative pressures, and can suppress deformation even under severe conditions.

  The amount of reduced pressure of the filler 8 produced by the method for producing the filler 8 according to the present embodiment is 1 kPa or more and 20 kPa or less. The amount of pressure reduction of the filler 8 can be measured by a pressure gauge, for example, a diaphragm type pressure gauge. The amount of reduced pressure is measured by inserting a piercing needle communicating with a detector provided in the pressure gauge into the head space of the filling body 8. It is possible to determine whether or not the method for manufacturing the filler 8 according to the present embodiment has been used by measuring the amount of reduced pressure of the filler 8 manufactured by the manufacturing apparatus 100 configured in an in-line manner. In addition, the value according to the content is suitably set to the pressure reduction amount of the filling body 8 in this case.

  By providing each process described above, manufacturing of the filling body 8 in which the PET bottle 1 having heat resistance applicable to hot filling and the filling body 8 hot-filled with the beverage 6 are produced in-line. A method can be provided. The PET bottle 1 according to this embodiment can also be applied to a manufacturing method that is not in-line.

  According to the manufacturing method of the filling body 8 according to the present embodiment, unlike the method in which a pre-molded plastic bottle is supplied to the content filling device, the high temperature can be obtained without taking time from the PET bottle 1 being molded. It is possible to proceed to the step of filling the beverage 6. For this reason, filling is started before the crystallinity degree of the trunk | drum 30 of PET bottle 1 falls, and the hot drink 6 can be filled, without reducing the heat resistance. In addition, these machines are combined as one apparatus rather than simply connecting the transport path of the PET bottle 1 between the bottle molding machine 110 (biaxial stretch blow molding apparatus 112) and the hot filling machine 120 (filler 121). By doing so, the effect is further enhanced.

  When a widely used heat-resistant bottle is molded, the temperature of the body die 117a is set high, for example, 150 ° C. or more and 165 ° C. or less. When the temperature of the body die 117a rises, the initial shrinkage increases and deformation occurs, the material of the die 117 is limited and the cost increases, and the temperature difference with the external environment, particularly the temperature, increases and heat resistance. Variations in quality such as heat resistance and shape of bottles will increase. Furthermore, when the temperature of the body die 117a rises, it is necessary to increase the time during which the high-pressure air P2 is blown, and the production capacity is reduced. On the other hand, according to the manufacturing method of the filling body 8 which concerns on this embodiment, it was possible to fill the hot drink 6 even if the heat resistance of the PET bottle 1 was lower than the heat-resistant bottle widely used. Thus, the temperature of the body die 117a can be lowered. For this reason, according to the manufacturing method of the filler 8 which concerns on this embodiment, it can prevent that the problem mentioned above arises.

  Furthermore, according to the manufacturing method of the filling body 8 according to the present embodiment, an in-line method is used in which the PET bottle 1 can be molded at a higher speed than the method in which a pre-molded plastic bottle is supplied to the content filling device. Therefore, the manufacturing cost of the filler 8 can be reduced.

  Furthermore, according to the manufacturing method of the filling body 8 according to the present embodiment, since the method in which the preform 5 is supplied instead of the PET bottle 1 is used, the cost of transporting the material can be reduced. That is, when the PET bottle 1 is molded in-line, the shape of the container supplied to the manufacturing apparatus 100 for the filling body 8 can be changed to the preform 5 having a smaller volume than the PET bottle 1. The number of transports from the manufacturer can be greatly increased, for example, six times or more. Therefore, the manufacturing apparatus 100 and the manufacturing method of the filling body 8 according to the present embodiment in which the bottle molding machine 110 of the PET bottle 1 is in-line contributes to the reduction of the transportation cost of the container and the reduction of the environmental load. Become.

  Next, the manufacturing method of the filling body 8 which concerns on another embodiment is demonstrated in detail. FIG. 11 is a flowchart showing an outline of the manufacturing process of the filler 8 according to another embodiment. The manufacturing method of the filling body 8 according to another embodiment is characterized in that the step (step S4) of blowing the cooling air C1 to the PET bottle 1 is omitted with respect to the manufacturing method shown in FIG. Here, in the manufacturing method according to another embodiment, the description of the same part as the manufacturing method shown in FIG. 9 is omitted as appropriate.

  In the manufacturing method according to another embodiment, the PET bottle 1 is blow-molded by stretching the preform 5 as in the manufacturing method shown in FIG. 9 (step S3). However, in the manufacturing method of the filling body 8 according to another embodiment, the surface temperature of the body die 117a is set to 80 ° C. or more and 115 ° C. or less.

  Also here, it is preferable that the temperature of the body portion 15 of the preform 5 heated in step S2 is higher than the temperature of the surface of the body die 117a. If the temperature of the body portion 15 is higher than the temperature of the surface of the body die 117a, initial shrinkage is difficult to occur.

  Then, similarly to the manufacturing method shown in FIG. 9, the body portion 15 of the preform 5 attached to the mold 117 is stretched in the longitudinal direction by the stretching rod 118. Further, the body portion 15 of the preform 5 stretched in the longitudinal direction is stretched in the lateral direction by the high-pressure air P2 until it hits the body mold 117a.

  In the manufacturing method of the filling body 8 according to another embodiment, the blowing of the cooling air C1 (step S4) to the PET bottle 1 is omitted during the blow molding process. However, in the method for manufacturing the filling body 8 according to another embodiment, the temperature of the surface of the body die 117a is 80 ° C. or more and 115 ° C. or less, and the temperature of the body portion 15 of the preform 5 to be heated is The temperature is made higher than the surface temperature of the body die 117a. Thereby, the initial contraction when the body portion 15 of the preform 5 is stretched and hits the body mold 117a is effectively suppressed. Therefore, in the manufacturing method of the filling body 8 according to another embodiment, the PET bottle 1 having heat resistance applicable to hot filling, even if the step (step S4) of blowing the cooling air C1 to the PET bottle 1 is omitted. And the filling body 8 by which the drink 6 was hot-filled can be produced.

  The blown PET bottle 1 is supplied to the hot filling machine 120 (step S5), and thereafter, the filling body 8 is manufactured through the same process as the manufacturing method shown in FIG. .

  The manufacturing method of the filling body 8 according to another embodiment has the same effects as the manufacturing method shown in FIG.

  In addition to this, since the temperature of the surface of the body die 117a can be set lower in the method of manufacturing the filling body 8 according to another embodiment, the material of the die 117 is, for example, stainless hardened and tempered steel, Aluminum can be used instead of the mold steel. By using aluminum, the metal mold 117 can be easily processed, the degree of design freedom is increased, and the manufacturing cost can be reduced. Furthermore, in the method for manufacturing the filler 8 according to another embodiment, an apparatus for spraying the cooling air C1 can be dispensed with. Therefore, the biaxial stretch blow molding apparatus 112 that does not include the cooling air blowing unit 119 can be used, and versatility can be improved. Furthermore, in the manufacturing method of the filling body 8 which concerns on another embodiment, since the process (step S4) which sprays the cooling air C1 is unnecessary, production of the filling body 8 by which the PET bottle 1 and the drink 6 were hot-filled was produced. Speed can be improved.

  As described above, the method for manufacturing the filling body 8 according to this embodiment includes the step of heating the body portion 15 of the preform 5 and the PET bottle 1 from the preform 5 using the mold 117. The step of molding, the step of filling the PET bottle 1 with the high-temperature beverage 6, the step of attaching the cap 7 to the mouth portion 10 of the PET bottle 1, and the mouth portion 10 and the cap 7 of the PET bottle 1 are sterilized by overturning. A process and a process of cooling the PET bottle 1, wherein all processes are performed in an in-line manner.

  According to the present embodiment, the PET bottle 1, which has both lightness and high strength against external force, can withstand pressure changes inside, particularly strong negative pressure, and can be prevented from being deformed even under severe conditions, filling The manufacturing method of the body 8 and the filling body 8 can be provided.

  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.

<Material and manufacturing method>
[Example 1]
A 24 g preform 5 made of polyethylene terephthalate and having a transparent mouth 10 was used. A filling body 8 composed of a PET bottle 1 having a full capacity of 530 ml according to this embodiment shown in FIG. 1 and the like and 510 ml of water filled at 85 ° C. is shown in FIG. It was produced inline from the preform 5 by the manufacturing method of the body 8.

  At that time, the body portion 15 of the preform 5 was heated to 118 ° C., and the temperature of the surface of the body mold 117 a was set to 115 ° C. The blow molding step (step S3) included a step (step S4) of blowing the cooling air C1 onto the PET bottle 1. Further, the mouth portion 10 is gripped from the step of filling the PET bottle 1 with high-temperature water (step S7) to the step of attaching the cap 7 to the PET bottle 1 (step S9). A method in which the bottle 1 is carried and carried is used.

  In the filling body 8 according to the first embodiment, the body portion 30 has a constricted portion 50 whose diameter is reduced in part, and the constricted portion 50 is based on the annular circumferential groove 51 and the circumferential groove 51. On the lower side in the axial direction, there is a pressure absorbing portion 52 formed by connecting a square panel 53 that deforms in and out of the PET bottle 1 corresponding to the change in the internal pressure of the PET bottle 1 in the circumferential direction, and on the upper side, the change in the internal pressure. Regardless, the reinforcing portion 60 that maintains the shape of the PET bottle 1 is provided, and the body portion 30 is formed with a reinforcing groove 73 in which a groove portion 71 and a non-groove portion 72 are repeated in the circumferential direction of the PET bottle 1. And the like according to the present embodiment.

[Comparative Example 1]
Comparative Example 1 was the same as Example 1 except that the PET bottle 200 shown in FIG. 12 was used. The PET bottle 200 did not have a configuration corresponding to the reinforcing portion 60 of the PET bottle 1 in the inverted truncated cone cylinder portion 260 formed on the upper side of the circumferential groove 51 of the constricted portion 250. Further, the PET bottle 200 has the reinforcing groove 271 formed in the upper cylindrical portion 270 in the circumferential direction and does not have a configuration corresponding to the non-groove portion 72 of the PET bottle 1. Therefore, the filler according to Comparative Example 1 did not have the characteristics according to the present embodiment.

[Comparative Example 2]
Comparative Example 2 was the same as Comparative Example 1 except that 28 g of Preform 5 was used. Therefore, the filler according to Comparative Example 2 did not have the characteristics according to the present embodiment.

[Comparative Example 3]
Comparative Example 3 was the same as Example 1 except that the PET bottle 300 shown in FIG. 13 was used. The PET bottle 300 does not have a configuration corresponding to the constricted portion and the reinforcing portion 60 of the PET bottle 1, and has an oval pressure absorbing panel 301 whose long side extends in the axial direction, and adjacent pressure absorbing panels. Between the 301 and 301, there is a column 302 extending in the axial direction. Therefore, the filler according to Comparative Example 3 did not have the characteristics according to this embodiment.

<Evaluation method>
(Lightweight)
Each PET bottle of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 was extracted at the formation stage, and it was determined whether weight reduction could be achieved by its mass. In the determination of weight reduction, a threshold value was set to be greater than 24 g or less. Table 1 shows the results of evaluation of the lightness of each PET bottle, and is indicated by ◯: light weight and x: no light weight.

(Decompression performance test)
The decompression performance of each packing of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 was measured. The amount of sucked-out when the perforating needle was inserted into the mouth 10 and the contents were sucked out and each PET bottle was clearly deformed was used as an index of decompression performance. In the determination of the decompression performance, a threshold of 30 ml or more was set. Table 1 shows the results of the evaluation of the decompression performance of each filler, and is indicated by ◯: with decompression performance and x: insufficient decompression performance.

(Overall maintenance performance)
The overall height maintaining performance of each packing material of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 was measured. Each PET bottle is filled with high-temperature water, extracted at the stage where the cap 7 is attached to each PET bottle, and it is determined whether or not the overall height can be maintained by the change in the overall height H1. It was. In the determination of maintaining the overall height, whether the changed length was greater than 0.8 mm or less was set as a threshold value. Table 1 shows the results of evaluation of the overall height maintenance performance of each PET bottle, and is indicated by ◯: with overall height maintenance performance and x: without overall height maintenance performance.

(Appearance confirmation test)
An appearance confirmation test was performed to determine whether or not the shapes of the PET bottles of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 were maintained during decompression. Each PET bottle was filled with 510 ml of 85 ° C green tea, and then the cap 7 was attached, and the bottle appearance after being slowly cooled at 75 ° C for 15 min and 30 ° C for 15 min was confirmed. It was. In order to determine whether the appearance is poor or good, a threshold value was set based on whether the difference between the maximum value and the minimum value of the maximum body diameter D1 was greater than 0.3 mm or less. That is, it is a confirmation of whether or not each PET bottle that has undergone a pressure change and a temperature change in which it is cooled to a reduced pressure state after being brought into a pressurized state by high-temperature filling has undergone an elliptical deformation. Table 1 shows the results of the appearance confirmation test for each PET bottle, and is indicated by ◯: good and x: bad.

(Comprehensive evaluation)
Based on the above-described lightness, reduced pressure performance test, overall height maintenance performance, and appearance confirmation test, the PET bottles (each filler) of Example 1 and Comparative Examples 1, 2 and 3 are comprehensive. Evaluation was 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. In the PET bottle 1 (filled body 8) according to Example 1, the PET bottle 1 is held in a state in which the trunk portion 30 is not deformed into an ellipse even when 30 ml or more of the contents are sucked out, and is filled with high-temperature water. However, the elongation of the total height H1 was suppressed to 0.8 mm or less. Furthermore, the PET bottle 1 (filler 8) according to Example 1 was cooled after being brought into a pressurized state by high-temperature filling, and the elliptical deformation at the time of being brought into the reduced pressure state was also suppressed. Therefore, as shown in Table 1, in Example 1, while being reduced in weight, the pressure reduction performance, the overall height maintenance performance, and the circular shape maintenance function of the trunk portion 30 during pressure reduction were excellent.

  On the other hand, in Comparative Example 1, although the weight was reduced, the decompression performance, the overall height maintenance performance, and the circular shape maintenance function of the body 230 during decompression were insufficient. When the weight reduction was slightly insufficient as in Comparative Example 2, the decompression performance, the overall height maintenance performance, and the circular shape maintenance function of the body 230 during decompression were satisfied. In Comparative Example 3, although the weight was reduced and the overall height maintenance performance was satisfied, the decompression performance and the circular shape maintenance function of the body portion 330 during decompression were insufficient.

  From the results of the above examples, the PET bottle 1 and the filling body 8 according to the present embodiment absorb the change in the internal pressure even when the weight is reduced, and the shoulder portion 20, the depression of the trunk portion 30, and the flatness. It has been shown that deformation such as kinking is sufficiently suppressed, and the overall height H1 is maintained particularly after filling. Moreover, according to the method for manufacturing the filler 8 according to the present embodiment, it was shown that the PET bottle 1 having such characteristics and the filler 8 can be manufactured without any problem. Therefore, in the present embodiment, the PET bottle 1 and the filling body 8 that have both lightness and high strength against external force, withstand internal pressure changes, particularly stronger negative pressure, and suppress deformation even under severe conditions. It has been shown that a method for manufacturing the filler 8 can be provided.

  The present disclosure can be suitably used for manufacturing various filling bodies 8 filled with liquid as contents. However, the present disclosure is not limited to the above-described embodiments and examples. The filling body 8 of the present disclosure includes, for example, water, green tea, oolong tea, various non-carbonated beverages such as tea, coffee, fruit juice, and soft drinks, or seasonings such as soy sauce, sauce, mirin, edible oil, and alcoholic beverages. It is useful for all fillers 8 containing foodstuffs, etc., detergents, shampoos, cosmetics, pharmaceuticals, etc. In particular, since the deformation of the container can be suppressed even under severe conditions of changes in internal pressure, it is possible to maintain a high commercial value even if the content has no expiration date, no expiration date, or is extremely long. And since the container 8 has heat resistance, the filling body 8 of the present disclosure is also suitable for warm sales in stores and the like, and the container has sufficient side wall strength, so that it can be used in vending machines. Is also suitable.

1 PET bottle (plastic bottle)
5 Preform 6 Beverage (Liquid)
DESCRIPTION OF SYMBOLS 7 Cap 8 Filling body 10 Mouth part 15 Body part of preform 5 20 Shoulder part 21 Rib 30 Body part of PET bottle 1 40 Bottom part 50 Neck part 51 Circumferential groove 52 Pressure absorption part 53 Square panel (panel)
54 Chamfered portion 57 Ridge line 70 Upper cylindrical portion 71 Groove portion 72, 72a, 72b, 72c Non-groove portion 73, 73a, 73b, 73c Reinforcing groove 80 Lower cylindrical portion 100 Manufacturing device for filling body 110 Bottle molding machine 111 Heating device (heating) Part)
112 Biaxial stretch blow molding equipment (molding part)
117 mold 120 hot filling machine 121 filler (filling part)
122 Capper (Mounting part)
130 Tumble Sterilizer (Tumble Sterilizer)
140 Path riser (cooling part)
D1 Maximum body diameter D2 Minimum body diameter d1 Groove depth of central portion 71C d2 Groove depth of both ends 71E H1 Total height of PET bottle 1 HP Length of rectangular panel 53 in axial direction WP Width of rectangular panel 53 in circumferential direction

Claims (24)

In a plastic bottle having a mouth, a shoulder, a torso, and a bottom,
The trunk is
In part, it has a constricted part with a narrowed body diameter,
The constricted part is
An annular circumferential groove;
A pressure absorbing portion configured on one side in the axial direction with respect to the circumferential groove, and a substantially rectangular panel that is deformed in and out of the plastic bottle in response to a change in the internal pressure of the plastic bottle;
A plastic bottle having a reinforcing part for maintaining the shape of the plastic bottle on the other side regardless of a change in the internal pressure. The plastic bottle according to claim 1, wherein the reinforcing portion has a plurality of annular reinforcing grooves. The circumferential groove is configured so that the body diameter is the smallest, and the pressure absorbing portion is located outside the circumferential groove in the radial direction of the plastic bottle. Item 1. A plastic bottle according to item 1. The plastic bottle according to claim 3, wherein the pressure absorbing portion is located at least 2 mm outside the circumferential groove in the radial direction of the plastic bottle. The plastic bottle according to any one of claims 1 to 4, wherein a ridge line that divides the panels adjacent in the circumferential direction extends in the axial direction. The pressure absorbing part is
The plastic bottle according to claim 5, further comprising a chamfered portion chamfered with respect to the ridge line. The value of the ratio of the mass with respect to the volume of the said plastic bottle is 0.0392 g / ml or more and 0.0600 g / ml or less, The plastic bottle of any one of Claims 1 thru | or 6 characterized by the above-mentioned. The plastic bottle according to any one of claims 1 to 7, wherein a thickness of the circumferential groove is 0.15 mm or more and 0.50 mm or less. The trunk is
The plastic bottle according to any one of claims 1 to 8, wherein the plastic bottle has cylindrical portions with the largest trunk diameter on both sides in the axial direction across the constricted portion. The shoulder is
The plastic bottle according to claim 1, further comprising an iris diaphragm-shaped rib. The ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.50 or less. The plastic bottle according to any one of the above. 12. The plastic bottle according to claim 1, wherein a value of a ratio of a width of the panel in the circumferential direction to a maximum body diameter is 0.2 or more and 0.8 or less. . The plastic bottle according to any one of claims 1 to 12, wherein the plastic bottle has heat resistance to a high-temperature liquid to be filled, and the mouth portion is transparent. The plastic bottle according to claim 13, wherein the temperature of the high-temperature liquid is 71 ° C or higher and 95 ° C or lower. The plastic bottle according to claim 13, wherein the temperature of the high-temperature liquid is 81 ° C or higher and 90 ° C or lower. The plastic bottle according to any one of claims 1 to 15, wherein the body portion has a crystallinity of 25% or more and 45% or less. The plastic bottle according to any one of claims 1 to 16, wherein a material constituting the plastic bottle is polyethylene terephthalate. 18. The plastic bottle according to claim 17, wherein a density of the body portion is 1.367 g / cm ³ or more and 1.387 g / cm ³ or less. The body portion is cut into a cut piece of 10 mm x 50 mm, and the cut piece has a tensile fracture strain of 40% or more and 68% or less at 85 mm and 300 mm / min. Item 19. A plastic bottle according to any one of Items 1 to 18. A plastic bottle according to any one of claims 1 to 19,
A filling body comprising a liquid filled at a high temperature. 21. The filler according to claim 20, wherein the amount of reduced pressure of the filler is 1 kPa or more and 20 kPa or less. A method for producing a filling body in which a plastic bottle molded from a preform having a transparent mouth is filled with a liquid,
The plastic bottle is
Having a mouth, a shoulder, a torso, and a bottom;
The trunk is
In part, it has a constricted part with a narrowed body diameter,
The constricted part is
An annular circumferential groove;
A pressure absorbing portion configured on one side in the axial direction with respect to the circumferential groove, and a substantially rectangular panel that is deformed in and out of the plastic bottle in response to a change in the internal pressure of the plastic bottle;
On the other side, regardless of the change in the internal pressure, and having a reinforcing part that maintains the shape of the plastic bottle,
Heating the body of the preform;
Blow molding the plastic bottle using a mold from the preform;
Filling the plastic bottle with the hot liquid;
Attaching a cap to the mouth of the plastic bottle;
Sterilizing the mouth and the cap of the plastic bottle by overturning;
Cooling the plastic bottle,
In the blow molding step, further comprising a step of blowing cooling air to the plastic bottle,
The body portion of the preform is heated to 95 ° C. or higher and 135 ° C. or lower, and the temperature of the mold body die is set to 80 ° C. or higher and 125 ° C. or lower.
A method for producing a filler, characterized in that all processes are performed in an in-line manner. The step of blowing cooling air to the plastic bottle is omitted,
The method for producing a filler according to claim 22, wherein the temperature of the body die is set to 80 ° C or higher and 115 ° C or lower. The method for manufacturing a filler according to any one of claims 22 to 23, wherein a temperature of the body portion of the preform is higher than a temperature of the body mold.

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