JP2017074705A - Preform, production method of preform, crystallization device for preform, plastic bottle, and production method of filled body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preform, a production method of a preform, a crystallization device for a preform, a plastic bottle, and a production method of a filled body, in which decrease in sealing property caused by shrinkage or deformation due to a liquid at a high temperature filling a bottle is suppressed even when a mouth of the bottle is in a standard shape generally used for normal temperature filling.SOLUTION: A preform for molding a PET bottle 2 is provided, which has heat resistance against a beverage at a high temperature filling the bottle and is sealed by an inner ring 65, a contact ring 66 or an outer ring 67 of a cap 60 attached to the bottle. The preform has a mouth 10 where the cap 60 is attached on a side of an opening end 11, and a body part connected to a support ring 12 of the mouth 10. An area on the opening end 11 side of the preform including a contact part with the inner ring 65, the contact ring 66 or the outer ring 67 has a higher density than in an area on the support ring 12 side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a preform, a preform manufacturing method, a preform crystallization apparatus, a plastic bottle, and a filling body manufacturing method, and more specifically, a molded plastic bottle is filled with a liquid while sterilizing at a high temperature. The present invention relates to a preform corresponding to so-called hot filling, a preform manufacturing method, a preform crystallization apparatus, a plastic bottle, and a filling body manufacturing method.

  Plastic bottles are often used as containers filled with liquids such as beverages as contents. In the production of plastic bottles, a method is often used in which a test tubular preform is molded from a resin with an injection molding machine or the like, and the preform is molded into a bottle with a blow molding machine. As a method of filling the contents into the plastic bottle, so-called hot filling in which a plastic bottle is filled with a liquid at a high temperature (for example, 85 ° C.) and aseptic filling in which a liquid at a normal temperature (for example, 30 ° C.) is filled. There is.

  Aseptic filling does not require heat resistance in the plastic bottle, and therefore it is relatively easy to mold. For this reason, in the aseptic filling method, there are many cases where an aseptic filling system in which a blow molding machine for plastic bottles is in-line with a filling machine is formed. And when plastic bottles are molded in-line, the form of containers supplied to the aseptic filling system can be changed to preforms that are smaller in volume than plastic bottles, greatly improving the transport efficiency from container manufacturers. For example, it is possible to increase it by 6 times or more. Therefore, the aseptic filling system using aseptic filling in which the plastic bottle blow molding machine is in-line contributes to the reduction of the transportation cost of the container and the reduction of the environmental load.

  On the other hand, because of the bottle supply method, a blow molding machine is not required, and a hot filling system that can reduce the initial cost as compared with an aseptic filling system using aseptic filling is often used. However, in the method using hot filling, a measure for imparting heat resistance to the plastic bottle so that the plastic bottle is not deformed by a high-temperature liquid, for example, crystallization of the mouth portion and the trunk portion is required, so that the production capacity is reduced. The cost of

  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

  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 anything about in-lining the plastic bottle blow molding machine and the filling machine. In other words, Patent Document 1 does not describe at all that plastic bottles are formed in a state where heat resistance deterioration due to humidification is small due to in-line implementation.

  Further, Patent Document 1 discloses that a PET (PolyEthylene Terephthalate) bottled beverage manufacturing method generally fills a PET bottle with a liquid content at a high filling temperature of 85 to 95 ° C. It is described that a mouth crystallized PET bottle having sufficient heat resistance must be used, and a mouth non-crystallized PET bottle whose mouth is not crystallized cannot be used. And in patent document 1, the filling temperature exceeding 80 degreeC is unnecessary for the disinfection of a bottle, and it is wasteful of energy, and when filling temperature exceeds 80 degreeC, it is sufficient heat resistance in a mouth non-crystalline PET bottle. It is said that it is difficult to obtain the product, and no investigation has been made on how to deal with a general method for producing a PET bottled beverage. In such a method of Patent Document 1, sterilization may be insufficient depending on the type of contents.

  When a PET bottle molded from a preform having a non-crystalline mouth is filled with high-temperature contents and sterilized, particularly the top surface of the mouth is deformed under the influence of heat. In order to avoid this, it is necessary to crystallize the mouth. However, since the mouth portion shrinks when crystallized, it is impossible to make use of a preform mold whose mouth portion is non-crystallized when trying to align the finished dimensions with those that are not crystallized. It takes time and money to manufacture the mold. On the other hand, when a preform mold having a non-crystalline mouth portion is used, the finished dimensions are changed, and a standard widely used cap cannot be used.

  Accordingly, an object of the present invention is to provide a preform in which a decrease in hermeticity due to shrinkage or deformation due to a high-temperature liquid to be filled is suppressed even if the mouth portion has a shape that is widely used for normal temperature filling. An object of the present invention is to provide a preform manufacturing method, a preform crystallization apparatus, a plastic bottle, and a filler manufacturing method.

  In order to solve the above-mentioned problems, the present invention is a preform for molding a plastic bottle having heat resistance against a high-temperature liquid to be filled and sealed by a closing ring of a cap to be mounted, A mouth part to which the cap is attached from the side of the opening part, and a body part connected to the support ring of the mouth part, and the side of the open end including the contact part with the closing ring is from the side of the support ring. Is also characterized by a high density.

Further, the difference in density between the opening end side and the support ring side is 0.004 g / cm ³ or more and 0.045 g / cm ³ or less.

  Further, the mouth portion is partially crystallized on the opening end side, and the support ring side is amorphous.

  Furthermore, the opening end side is an area of 5 mm from the opening end toward the support ring.

  The mouth portion further includes a screw that meshes with a screw formed in the cap, the valley diameter of the screw is 26 mm or less, and the inner diameter of the mouth portion is 21.74 mm ± 0.13 mm. To do.

  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 present invention is a method for manufacturing a preform for molding a plastic bottle that has heat resistance to a hot liquid to be filled and is sealed by a closing ring of a cap to be mounted. A mouth portion to which the cap is mounted from the opening end side, and a body portion connected to the support ring of the mouth portion, and the opening end side including the contact portion with the closing ring is disposed on the side of the support ring. Heat treatment is performed so that the density is higher than that on the side.

  Furthermore, the opening end side is heat-treated discontinuously in the circumferential direction.

  Further, heat treatment is performed at eight locations in the circumferential direction.

  Furthermore, heat insulation is performed between the opening end side and the support ring side.

  Further, the support ring side is cooled.

  Furthermore, the present invention provides a preform crystal that partially heats the preform for molding a plastic bottle that is heat resistant to the hot liquid to be filled and that is sealed by the closure ring of the cap to be mounted. A heating device that holds the mouth portion of the preform and a heat treatment portion that heat-treats the mouth portion, and the heat treatment portion heat-treats the opening end side of the mouth portion. The holder is configured to have a shape that suppresses deformation of the heated open end side.

  Furthermore, the present invention is a plastic bottle that has heat resistance to a high-temperature liquid to be filled and is sealed by a closing ring of a cap to be mounted, and a mouth portion to which the cap is mounted from the open end side. The opening end side including a contact portion with the closing ring, a shoulder portion connected to the support ring of the mouth portion, a body portion connected to the shoulder portion, and a bottom portion connected to the body portion, The density is higher than that of the support ring.

  Furthermore, the present invention comprises a mouth portion to which a cap is attached from the opening end side, and a body portion connected to a support ring of the mouth portion, and the mouth portion is molded and filled from a non-crystalline preform. A method of manufacturing a filling body in which a plastic bottle having heat resistance to a high-temperature liquid is filled with the high-temperature liquid so that the opening end side has a higher density than the support ring side. Heating the body of the preform that has been heat-treated; blowing the plastic bottle from the preform using a mold; and filling the plastic bottle with the high-temperature liquid; Attaching the cap to the mouth of the plastic bottle; sterilizing the mouth and the cap of the plastic bottle by overturning; Characterized in that it comprises a step of cooling the stick bottle.

  Furthermore, the step of heating the barrel, the step of blow molding the plastic bottle, the step of filling the liquid, the step of attaching the cap, the step of sterilizing the mouth and the cap by overturning And the step of cooling the plastic bottle is all performed in an in-line manner.

  According to the present invention, there is provided a preform for molding a plastic bottle that has heat resistance to a high-temperature liquid to be filled and is sealed by a closing ring of a cap to be mounted, and the cap is formed from the open end side. The mouth portion is provided with a body portion connected to the support ring of the mouth portion, and the opening end side including the contact portion with the closing ring has a higher density than the support ring side. Even in a shape that is widely used for normal temperature filling, it is possible to provide a preform in which a decrease in hermeticity due to shrinkage or deformation due to high-temperature liquid to be filled is suppressed.

Further, according to the configuration in which the difference in density between the open end side and the support ring side is 0.004 g / cm ³ or more and 0.045 g / cm ³ or less, the mouth portion is typically used for filling at room temperature. Even with a widely used shape, it is possible to provide a preform in which deterioration in sealing performance due to shrinkage or deformation due to a high-temperature liquid to be filled is further suppressed.

  Furthermore, according to the structure in which the mouth part is partially crystallized on the opening end side and the support ring side is amorphous, the mouth part has a shape that is widely used for normal temperature filling. In addition, it is possible to provide a preform in which a decrease in sealing performance due to shrinkage or deformation due to a high-temperature liquid to be filled is further suppressed.

  Further, according to the configuration in which the opening end side is an area from the opening end to the support ring up to 5 mm, the high temperature to be filled even if the mouth portion has a shape widely used for normal temperature filling. It is possible to provide a preform in which the deterioration of the sealing performance due to the contraction or deformation of the liquid is further suppressed.

  The mouth portion further includes a screw that meshes with a screw formed in the cap, the thread root diameter is 26 mm or less, and the mouth inner diameter is 21.74 mm ± 0.13 mm. Even if it is a shape that is widely used for filling at normal temperature, it is possible to provide a preform in which a decrease in hermeticity due to shrinkage or deformation due to a high-temperature liquid to be filled is further suppressed.

  Furthermore, since the temperature of the high-temperature liquid is 71 ° C. or higher and 95 ° C. or lower, the mouth and cap of the plastic bottle molded from the preform can be effectively sterilized. And even if a mouth part is the shape widely used for normal temperature filling normally, the preform by which the fall of the sealing performance resulting from the shrinkage | contraction and deformation | transformation by the high temperature liquid with which it fills was suppressed can be provided. .

  Furthermore, since the temperature of the high-temperature liquid is 81 ° C. or higher and 90 ° C. or lower, the mouth portion and the cap of the plastic bottle molded from the preform can be effectively sterilized. And even if a mouth part is the shape widely used for normal temperature filling normally, the preform by which the fall of the sealing performance resulting from the shrinkage | contraction and deformation | transformation by the high temperature liquid with which it fills was suppressed can be provided. .

  Furthermore, according to the present invention, there is provided a method for manufacturing a preform for molding a plastic bottle having heat resistance against a high-temperature liquid to be filled and sealed by a closing ring of a cap to be mounted. Has a mouth part to which the cap is attached from the opening end side and a body part connected to the support ring of the mouth part, and the density of the opening end side including the contact part with the closing ring is higher than that of the support ring side. Therefore, even if the mouth portion has a shape that is widely used for normal temperature filling, deterioration in sealing performance due to shrinkage or deformation due to high-temperature liquid to be filled is suppressed. A method for manufacturing a preform can be provided.

  Furthermore, since the opening end side is discontinuously heat-treated in the circumferential direction, even if the mouth portion has a shape that is widely used for normal temperature filling, it is caused by shrinkage or deformation due to the hot liquid to be filled. It is possible to provide a method for producing a preform in which a decrease in sealing performance is further suppressed.

  Further, since heat treatment is performed at eight locations in the circumferential direction, even if the mouth portion has a shape that is widely used as a standard for filling at room temperature, the sealing performance is reduced due to shrinkage or deformation due to the high-temperature liquid to be filled. It is possible to provide a method for manufacturing a preform that is more suppressed.

  Furthermore, since heat insulation is provided between the open end side and the support ring side, even if the mouth portion has a shape that is widely used for normal temperature filling, it can be shrunk or deformed by the hot liquid to be filled. It is possible to provide a method for producing a preform in which the deterioration of the resulting sealing property is suppressed.

  Furthermore, since the support ring side is cooled, even if the mouth portion has a shape that is widely used for normal temperature filling, deterioration in sealing performance due to shrinkage or deformation due to high temperature liquid to be filled is suppressed. A method for manufacturing a preform can be provided.

  Furthermore, according to the present invention, a preform having a heat resistance to a hot liquid to be filled and partially crystallizing a preform for molding a plastic bottle sealed by a closure ring of a cap to be mounted. The crystallization apparatus includes a holder that holds the mouth portion of the preform and a heat treatment portion that heat-treats the mouth portion, and the heat treatment portion heat-treats the opening end side of the mouth portion. Since the holder is configured in a shape that suppresses deformation on the side of the heated opening end, even if the mouth portion has a shape that is widely used for normal temperature filling, it is filled at a high temperature. It is possible to provide a preform crystallization apparatus for tailoring a preform in which a decrease in hermeticity due to shrinkage or deformation due to the liquid is suppressed.

  Furthermore, according to the present invention, there is provided a plastic bottle that has heat resistance to a high-temperature liquid to be filled and is sealed by a closing ring of a cap to be mounted, and the mouth portion to which the cap is mounted from the open end side. And a shoulder part connected to the support ring of the mouth, a trunk part connected to the shoulder part, and a bottom part connected to the trunk part. Because the density is higher than the side, even if the mouth is a shape that is widely used for filling at normal temperature, the plastic bottle in which deterioration in sealing performance due to shrinkage or deformation due to high-temperature liquid to be filled is suppressed Can be provided.

  Furthermore, according to the present invention, a mouth part to which a cap is attached from the opening end side and a body part connected to the support ring of the mouth part are provided, and the mouth part is molded and filled from an amorphous material. A method for producing a filling body in which a high-temperature liquid is filled in a plastic bottle having heat resistance against a high-temperature liquid, and the open end side is heat-treated so as to have a higher density than the support ring side. A step of heating the body of the preform, a step of blow-molding a plastic bottle using a mold from the preform, a step of filling the plastic bottle with a high-temperature liquid, and attaching a cap to the mouth of the plastic bottle A process, a step of sterilizing the mouth and cap of the plastic bottle, and a step of cooling the plastic bottle. A and widely shape which is also used, it is possible to provide a manufacturing method for sealing filler body decrease is suppressed in due to shrinkage or deformation due to high temperature of the liquid to be filled.

  Furthermore, the step of heating the body portion, the step of blow molding the plastic bottle, the step of filling the liquid, the step of attaching the cap, the step of sterilizing the mouth portion and the cap, and cooling the plastic bottle Since all the processes are performed in-line, even if the mouth portion has a shape that is widely used for normal temperature filling, deterioration in sealing performance due to shrinkage and deformation due to high-temperature liquid to be filled is suppressed. A method for producing a filler can be provided.

It is the front view in which an example of the preform concerning this embodiment was shown. It is the fragmentary sectional view in which the state where the screwing type cap was attached to the mouth was shown. It is the principal part longitudinal cross-sectional view which illustrated the crystallization apparatus of the preform. FIG. 4 is a cross-sectional view (transverse cross-sectional view) taken along line IV-IV in FIG. 3. 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 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.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, details of the configuration of the preform 1 (preliminary body) according to this embodiment for molding a plastic bottle that has heat resistance to a high-temperature liquid to be filled and is sealed by a closing ring of a cap to be mounted. Explained. FIG. 1 is a front view showing an example of a preform 1 according to this embodiment. In the following, for convenience of explanation, the mouth portion 10 of the preform 1 in the state of FIG. 1 in which the open side of one end side of the preform 1 faces upward is referred to as “up”.

  The preform 1 according to the present embodiment has a bottomed cylindrical shape that is open at one end side, and includes a mouth portion 10 on the open side and a body portion 15 on the bottom side. The mouth portion 10 has an annular opening end 11 at its upper end and an annular support ring 12 projecting outward at its lower end.

  On the outer periphery of the mouth portion 10, a male screw 13 (screw) for mounting a cap (not shown here) after the preform 1 is formed into a bottle shape by a blow molding machine (not shown) is provided. Further, the mouth portion 10 has an annular turnip 14 protruding outward between the support ring 12 and the external screw 13 on the outer periphery thereof. The support ring 12 protrudes outward from the turnip 14.

  The shape of the mouth portion 10 does not change even after being molded by the blow molding machine. On the other hand, the trunk | drum 15 is a cylindrical shape, and is a part which swells so that it may become a bottle shape in the case of blow molding. The body portion 15 includes a neck portion 16 connected to the mouth portion 10 (the lower surface of the support ring 12), a body middle portion 17 connected to the neck portion 16, and a bottom portion 18 connected to the body middle portion 17.

  For example, the neck portion 16 is formed in an inverted truncated cone shape that decreases in diameter from the mouth portion 10 side toward the body middle portion 17 side. That is, the barrel diameter at the lower end of the neck portion 16 is smaller than the barrel diameter at the upper end of the neck portion 16 (just below the support ring 12). Further, the neck portion 16 may be configured to increase in thickness from the mouth portion 10 side toward the body middle portion 17 side from the viewpoint of improving the blow moldability. That is, the thickness at the lower end of the neck 16 may be greater than the thickness at the upper end of the neck 16.

  The body diameter and thickness of the body middle portion 17 are substantially true cylindrical shapes that hardly change in the vertical direction. However, the cylinder middle part 17 may be provided with a draft angle that is an inclination for facilitating removal from the mold used when the preform 1 is produced by injection molding. The wall thickness may be slightly changed in the vertical direction.

  The bottom portion 18 is formed in a substantially hemispherical shape curved outward. The bottom portion 18 may have a conical shape, a cylindrical shape with rounded corners, or other shapes. The bottom 18 is attached with a solidified portion formed incidentally at the molten resin inflow port (gate) when the preform 1 is produced by injection molding. FIG. 1 shows a form after the portion has been cut off.

  The distance from the lower surface of the support ring 12 to the lower end of the bottom portion 18 is the height H1 of the body portion 15. Furthermore, the diameter on the outer peripheral side of the trunk middle portion 17 is the outer diameter D1 of the trunk portion 15. It is preferable that the height H1 of the trunk | drum 15 is 50 mm or more and 90 mm or less. Furthermore, it is preferable that the outer diameter D1 of the trunk | drum 15 is 16 mm or more and 25 mm or less.

  Examples of the material of the preform 1 include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene and other polyolefins, ethylene-vinyl alcohol copolymers, polylactic acid made from plants, and the like. Various plastics that can be blow molded can be used. However, the preform 1 is preferably composed mainly of polyester such as polyethylene naphthalate, particularly polyethylene terephthalate. The above-mentioned resin contains various additives such as a colorant, an ultraviolet absorber, a release agent, a lubricant, a nucleating agent, an antioxidant, and an antistatic agent as long as the quality of the molded product is not impaired. Can be blended.

  As the ethylene terephthalate thermoplastic resin constituting the preform 1, an ethylene terephthalate unit occupies most of the ester repeating portion, generally 70 mol% or more, and has a glass transition point (Tg) of 50 ° C. or more and 90 ° C. or less. It is preferable that the melting point (Tm) is 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.

  The preform 1 is formed by, for example, injection molding pellet-shaped polyethylene terephthalate as a main raw material. For injection molding, an injection molding apparatus including a hopper dryer, a hopper, a heating cylinder, a screw, a mold, a cooler, and the like is used. The pellet-shaped polyethylene terephthalate is subjected to drying, plasticization, injection, pressurization, and cooling steps to form the preform 1.

  Note that the preform 1 may be composed of multiple layers. At least one of the multilayers may have a barrier layer or an oxygen absorption layer. For the barrier layer, for example, polyamide or ethylene-vinyl alcohol copolymer is used. For the oxygen absorbing layer, a layer containing a combination of an oxidizable organic component and a transition metal catalyst, or a gas barrier resin that does not substantially oxidize is used. Such a barrier layer or an oxygen absorbing layer can provide an oxygen permeation preventing function.

  Even when the preform 1 is composed of a single layer, for example, polyamide as an oxygen removing compound may be mixed with polyethylene terephthalate. With such a configuration, an oxygen permeation preventing function can be imparted even with a single layer. The same applies to other characteristics such as ultraviolet shielding properties.

  A cap is attached to the plastic bottle formed into a bottle shape from the preform 1 according to the present embodiment. Then, next, the structure of the cap with which the opening | mouth part 10 is mounted | worn is demonstrated in detail. FIG. 2 is a partial cross-sectional view showing a state in which the screw-in type cap 60 is attached to the mouth portion 10. A plastic bottle, for example, a PET bottle 2 is hermetically sealed by attaching the cap 60 to the mouth portion 10 by being tightened. In addition, as a material of the cap 60, polypropylene, high density polyethylene, or the like is used.

  The cap 60 includes a cap body 61 positioned on the upper side when the cap 60 is attached to the mouth portion 10 and a peeling ring 70 positioned on the lower side thereof. The peeling ring 70 has a ring shape. The peeling ring 70 includes a plurality of flaps 71 projecting inward and upward from the inner peripheral surface thereof. When the cap 60 is wound around the mouth portion 10 until the PET bottle 2 is in an initial sealed state, the flap 71 falls to the inner peripheral side of the peeling ring 70, and after overcoming the cabra 14, the flap 71 It is comprised so that it may leave | separate from the inner periphery of 70. The cap main body 61 and the peeling ring 70 are connected to each other via a connecting member 72 that can be broken when the cap 60 is initially opened.

  The flap 71 at the time of initial sealing is arranged between the turnip 14 and the support ring 12. When the cap 60 is rotated in the opening direction, the upper end of the flap 71 hits the turnip 14 and the upward movement of the peeling ring 70 is prevented. Further, when the cap 60 is rotated, the connecting member 72 is broken, and the cap body 61 and the peeling ring 70 are separated. Then, the cap main body 61 is removed from the mouth portion 10 with the peeling ring 70 remaining between the turnip 14 and the support ring 12. As described above, the cap 60 has a tamper-evident function, that is, a tamper-evident function that can be seen at a glance whether or not the initial opening has been performed.

  The cap body 61 includes a disk-shaped upper part 62 and a cylindrical body part 63 that hangs down from the periphery of the upper part 62. The body portion 63 has a female screw 64 that meshes with the male screw 13 of the mouth portion 10 on the inner peripheral surface thereof. The cap 60 has a closing ring that comes into close contact with the mouth portion 10 and seals the PET bottle 2. FIG. 2 shows an example in which the closing ring includes an inner ring 65, a contact ring 66, and an outer ring 67 that are suspended from the inner surface of the upper portion 62 in order from the radially inner side of the cap 60. Yes.

  The inner ring 65 has a protruding portion that protrudes outward from the cap 60 on the outer peripheral surface thereof, and the protruding portion of the inner ring 65 contacts the inner peripheral surface 10 a of the mouth portion 10. The lower front end portion of the contact ring 66 contacts the open end 11 of the mouth portion 10. The outer ring 67 has a protruding portion that protrudes inward of the cap 60 on the inner peripheral surface thereof, and the protruding portion of the outer ring 67 contacts the outer peripheral surface 10 b of the mouth portion 10. And the sealing of PET bottle 2 is maintained by the contact of these three places. Note that the PET bottle 2 can be sealed if there is at least one occlusion ring in the above-described three locations. However, as illustrated in FIG. 2, by providing the inner ring 65, the contact ring 66, and the outer ring 67, more reliable sealing performance can be realized.

  The main raw material polyethylene terephthalate constituting the preform 1 is 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 at which the amorphous part has fluidity and at a melting point of about 260 ° C. or less, particularly at about 140 ° C. or higher and 160 ° C. or less at which the crystal part also flows It has the property that molecular chain orientation occurs and the proportion of crystal parts increases. 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.

  On the other hand, polyethylene terephthalate undergoes heat treatment to cause shrinkage or deformation, which becomes more prominent as the crystallinity is lower. Therefore, from the viewpoint of maintaining the shape and dimensions of the preform 1, it is preferable to narrow down the places where the heat treatment is performed as much as possible.

  The mouth 10 is kept sealed with the PET bottle 2 by contact with the inner ring 65, the contact ring 66, and the outer ring 67. If the contact portion of the mouth 10 with the inner ring 65 or the like is deformed, the PET bottle 2 cannot be sealed depending on the degree. Therefore, in particular, the mouth portion 10 is required not to be deformed by the heat of the high-temperature liquid filled in the contact portion with the inner ring 65 or the like. On the other hand, not so much heat resistance is required in the mouth portion 10 away from the contact portion with the inner ring 65 or the like, and further, shrinkage or deformation due to heat treatment does not occur as much as possible. Is desired. For example, when the male screw 13 is contracted by heat, the engagement with the female screw 64 of the cap 60 is deteriorated and the male screw 13 is easily loosened. Furthermore, since the support ring 12 side is thicker than the open end 11 side, the heat resistance is originally stronger.

From the above, the preform 1 according to this embodiment has different densities on the side of the open end 11 including the contact portion with the inner ring 65, the contact ring 66, and the outer ring 67, and on the support ring 12 side. The opening end 11 side has a higher density than the support ring 12 side. Thereby, the heat resistance of the PET bottle 2 molded from the preform 1 can be particularly improved on the opening end 11 side. The difference in density between the opening end 11 side and the support ring 12 side is more preferably 0.004 g / cm ³ or more and 0.045 g / cm ³ or less. By providing such a difference in density, the heat resistance can be further ensured while the dimensional change on the opening end 11 side is a heat treatment at a very small level.

  The density 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 opening end 11 side and a part of the support ring 12 side in, for example, 1 mm square. By measuring the density on the open end 11 side and on the support ring 12 side, it is possible to determine whether or not the preform 1 is according to the present embodiment.

  Here, the opening end 11 side may include a contact portion with the inner ring 65 or the like of the mouth portion 10. In particular, it is important that the side wall portion of the mouth 10 is included. FIG. 1 shows a vertical length a on the opening end 11 side and a vertical length b on the support ring 12 side. More specifically, the opening end 11 side may be a region having a length a up to 5 mm from the opening end 11 toward the support ring 12. In many cases, the contact position between the mouth portion 10 and the inner ring 65 is about 2 mm to 3 mm from the opening end 11 side. Therefore, if the heat resistance in the region where the length a is 5 mm from the open end 11 toward the support ring 12 is increased, the heat of the high-temperature liquid to be filled makes contact with the inner ring 65 or the like of the mouth portion 10. The portion is not deformed and the sealing of the PET bottle 2 is maintained.

  In the preform 1 according to this embodiment, the mouth portion 10 at the stage formed by injection molding or the like is amorphous. Accordingly, it is only necessary that the mouth portion 10 is partially crystallized on the opening end 11 side and the support ring 12 side is amorphous. According to the preform 1 according to the present embodiment configured as described above, a range in which measures for shrinkage and deformation are required during heat treatment can be reduced.

  At the stage of the preform 1, the shape of the mouth portion 10 configured such that the opening end 11 side is higher in density than the support ring 12 side does not change even after being formed into the PET bottle 2. The shape of the mouth portion 10 is such that the fitting with the cap 60 widely used as standard, the suitability for transporting the PET bottle 2 by a molding device or a filling device, and the strength required for transporting or filling. Designed with consideration.

  Therefore, the outer diameter (corresponding to the root diameter D2 (see FIG. 1) of the male screw 13), the inner diameter, the mountain diameter D3 of the male screw 13, and the height of the mouth portion 10 of the preform 1 according to this embodiment are, for example, It is preferable that the dimensions are those that are typically used in beverage bottles. At this time, it is particularly preferable that the mouth portion 10 is molded without being changed from the dimensions that are generally widely used for filling at room temperature. As a result, a mold for molding the preform 1 according to the present embodiment having heat resistance can be shared by utilizing a mold for filling at room temperature, and thus the efficiency can be increased and a new Since no mold is required, the cost can be reduced.

  For example, the mouth portion 10 may have dimensions corresponding to the PCO (Plastic Closure Only) 1810 standard or the PCO 1881 standard. More specifically, the outer diameter of the mouth portion 10 (valley diameter D2 of the external thread 13) is preferably 24.94 mm ± 0.13 mm. Further, the inner diameter of the mouth 10 is preferably 21.74 mm ± 0.13 mm. Furthermore, the crest diameter D3 of the external thread 13 is preferably 27.43 mm ± 0.13 mm. Further, the height of the mouth portion 10 is preferably either 21.00 mm ± 0.25 mm (PCO1810 standard) or 17.00 mm ± 0.25 mm (PCO1881 standard). The height of the mouth 10 is a distance from the lower surface of the support ring 12 to the upper end of the mouth 10. Furthermore, considering the fitting property with the cap 60 for filling at room temperature, the root diameter D2 of the external thread 13 is preferably 26 mm or less.

Next, the configuration of the crystallization apparatus for the preform 1 according to the present embodiment will be described in detail. FIG. 3 is a longitudinal sectional view of a principal part illustrating the crystallization apparatus 90 for the preform 1, and FIG. 4 is a sectional view (transverse sectional view) taken along line IV-IV in FIG. 3. The crystallization apparatus 90 includes at least a holder 91 that holds the mouth portion 10 of the preform 1 and a heat treatment portion 92 that heat-treats the mouth portion 10. The crystallization apparatus 90 performs heat treatment to partially crystallize the opening end 11 side in the mouth portion 10 of the preform 1.

  The holder 91 illustrated in FIGS. 3 and 4 is formed with, for example, an annular groove 91a corresponding to the outer diameter and inner diameter of the mouth portion 10 according to the PCO1810 standard. The groove 91a is configured such that the opening end 11 side of the preform 1 enters. The groove 91a has a depth that allows at least the region where the mouth portion 10 and the inner ring 65 (see FIG. 2) come into contact, preferably 5 mm from the opening end 11 side (length on the opening end 11 side). It corresponds to a) and has a depth of penetration. The holder 91 has a male screw 13 and a groove 91 a formed in a shape corresponding to the opening end 11 side of the male screw 13, that is, a finished dimension of the preform 1.

  The heat treatment part 92 is configured to heat-treat the opening end 11 side of the mouth part 10. The heat processing unit 92 is configured by, for example, a heater embedded in the holder 91. For example, a silicon rubber heater may be used as the heater. The heat treatment unit 92 illustrated in FIG. 3 is provided at a position along the outer peripheral surface 10 b of the mouth 10.

  In addition, as shown in FIG. 4, the heat treatment unit 92 is more preferably discontinuously arranged in the circumferential direction of the opening end 11. Since the heat treatment unit 92 is discontinuously arranged, the opening end 11 side is prevented from being deformed all at once in the circumferential direction when the heat treatment is performed. Can be suppressed. Furthermore, when the heat treatment parts 92 are discontinuously arranged in the circumferential direction, the number is particularly preferably eight. By having eight heat treatment portions 92, it is possible to perform heat treatment that is symmetrical and well-balanced, and deformation due to heat treatment can be more effectively suppressed.

  In the crystallization apparatus 90, the heater heated to, for example, about 160 ° C. to 180 ° C. by the heat treatment unit 92 is brought into contact with the opening end 11, so that the region on the opening end 11 side is heated and partially crystallized. It is configured to be

  On the other hand, the groove 91a of the holder 91 causes expansion when the region on the opening end 11 side is heated, and subsequent contraction and deformation on both the outer peripheral side and the inner peripheral side of the preform 1. It is comprised so that it can suppress.

  As described above, the crystallization apparatus 90 heats the region on the opening end 11 side by the heat treatment unit 92 to cause partial crystallization, and the holder 91 contracts the region on the opening end 11 side by heating. In addition, it is configured to suppress deformation and deformation and to keep the change in dimensions within an allowable range. Therefore, according to the present embodiment, even when the mouth portion 10 has a shape that is widely used for normal temperature filling, deterioration in sealing performance due to shrinkage or deformation due to high-temperature liquid to be filled is suppressed. A crystallizing apparatus 90 for the preform 1 for tailoring the preform 1 can be provided.

  The crystallization apparatus 90 may be further provided with a heat insulating material 93 in order to locally limit the portion to be heated of the preform 1 on the opening end 11 side. The heat insulating material 93 may be provided, for example, so as to be laminated on the holder 91, and is disposed between the opening end 11 side and the support ring 12 side, particularly in the vicinity of the male screw 13. And good. Furthermore, as illustrated in FIG. 3, when the heat treatment unit 92 is provided along the outer peripheral surface 10 b of the mouth portion 10, the heat insulating material 93 is formed from the inner peripheral surface 10 a of the mouth portion 10 or the opening end. 11 may be provided. As the heat insulating material 93, a material having excellent heat resistance and compressive strength is selected. As the heat insulating material 93, for example, a material obtained by impregnating a glass fiber with a thermosetting resin and heating and pressurizing it into a plate shape may be used.

  The crystallization device 90 may further be provided with a cooling device 94 in order to limit the range in which the preform 1 is heated. The cooling device 94 is configured to cool the periphery of the mouth 10 to be heated, particularly on the side of the support ring 12. The cooling device 94 illustrated in FIG. 3 and FIG. 4 includes, for example, a cold air generation device 94a that cools the heat transfer medium, a blower (not shown) that sends out the cold air ac cooled by the cold air generation device 94a, The cool air introduction flow path 94b through which the cool air ac guided to the inner peripheral side passes is configured.

  The cold air introduction flow path 94b is formed in the center of the holder 91 in plan view. The cold air introduction flow path 94 b is formed to extend along the axial direction of the preform 1 at a position corresponding to the inner periphery of the opening end 11 when the preform 1 is installed on the holder 91.

  In other words, the crystallization device 90 supports the support ring by allowing the cold air ac cooled to, for example, about 0 ° C. by the cooling device 94 to pass through the cold air introduction flow path 94 b and contact the inner peripheral side of the mouth portion 10. The 12 side is configured to be cooled. In addition, it is comprised so that especially the center of the holder 91 may be prevented from being heated by the cold air ac passing through the cold air introduction flow path 94b. And it is comprised so that the area | region by the side of the opening end 11 may not be heated too much through the holder 91. FIG. Therefore, the cooling device 94 has a function of preventing the preform 1 from contracting and deforming due to heating by the heat treatment unit 92.

  The heat treatment unit 92 is provided on the inner circumference side of the preform 1, the cooling device 94 is provided on the outer circumference side of the preform 1, and the arrangement of the heat treatment unit 92 and the cooling device 94 is reversed. It may be said. Furthermore, the cooling device 94 may be configured by a so-called chiller so that the heat transfer medium circulates in the center of the holder 91. The heat transfer medium of the cooling device 94 may be circulated on the support ring 12 side with respect to the heat insulating material 93.

  The crystallization device 90 may be configured in an in-line manner between the preform 1 molding device and the PET bottle 2 molding device. In particular, the crystallization device 90 is in-line with the preform 1 molding device. It is preferable to be configured in a manner. The crystallization apparatus 90 may be incorporated in the preform 1 molding apparatus.

  Next, the manufacturing method of the preform 1 according to this embodiment will be described in detail. First, the preform 1 is formed with the mouth portion 10 in an amorphous state by, for example, injection molding. From this state, the preform 1 is heated by the crystallization device 90 so that the density at the open end 11 side is higher than the density at the support ring 12 side. More specifically, the preform 1 is attached to the holder 91 by being pushed into the groove 91 a of the crystallization apparatus 90. The opening end 11 side of the preform 1 attached to the crystallization apparatus 90 is in a state of being fixed to a holder 91 having a groove 91 a formed in the finished dimension of the preform 1.

  In this state, the heater applied from the outer peripheral side on the opening end 11 side is heated to 180 ° C., for example. The crystallization apparatus 90 has a higher density on the side of the open end 11 including the contact portions with the inner ring 65, the contact ring 66, and the outer ring 67 (see FIG. 2) than on the support ring 12 side. Heat treatment. Crystallization proceeds on the side of the open end 11 heated by the heater. At that time, although shrinkage or deformation occurs on the opening end 11 side, the change in dimensions from the opening end 11 side to the periphery of the external thread 13 is within an allowable range because it is fitted in the groove 91a. On the other hand, since the support ring 12 side is not heated, shrinkage or deformation does not occur and crystallization is not performed.

  In addition, as FIG. 4 shows, it is more preferable to heat-process the opening end 11 side discontinuously in the circumferential direction. By subjecting the open end 11 side to heat treatment in the circumferential direction discontinuously, it is possible to prevent the entire circumferential direction from being deformed all at once, and as a result, deformation due to the heat treatment can be effectively suppressed. . Furthermore, it is particularly preferable to perform heat treatment at eight locations in the circumferential direction. By performing heat treatment at eight locations, it is possible to perform heat treatment that is symmetrical and well-balanced, and deformation due to the heat treatment can be more effectively suppressed.

  In this way, a preform for molding the PET bottle 2 that has heat resistance to the high-temperature liquid to be filled and is sealed by the inner ring 65, the contact ring 66, and the outer ring 67 of the cap 60 to be mounted. 1 can be manufactured.

  Here, in a crystallization port frequently used for hot filling, a mold is often manufactured with a design in which a shrinkage during crystallization is included in advance. On the other hand, the non-crystallizing port often used for filling at normal temperature can be made to have a certain degree of heat resistance by increasing its thickness, but there is a limit to this. Deformation to the inner or outer peripheral side in the vicinity of the surface, that is, leakage from this part becomes a particular problem. Furthermore, the greater the thickness of the non-crystallizing port, the more difficult it is to engage with the cap 60. On the other hand, the preform 1 according to the present embodiment is efficient because the non-crystallized mouth and the mold can be made common by crystallizing the mouth portion 10 from a non-crystalline state. Furthermore, the preform 1 according to the present embodiment can be filled at a high temperature while using the cap 60 for a non-crystallizing port that is widely used by suppressing the dimensional change of the mouth portion 10 to a certain level or less.

  More preferably, when the opening end 11 side of the preform 1 is heated by the crystallization apparatus 90, the opening end 11 side and the support ring 12 side are insulated from each other. For example, in the heat insulating material 93 provided correspondingly between the opening end 11 side and the support ring 12 side, heat applied from the heat treatment unit 92 to the opening end 11 side is transmitted to the support ring 12 side. To prevent that. Therefore, the location where the preform 1 is heated can be locally limited on the opening end 11 side by providing the heat insulating material 93.

  Furthermore, when the crystallization device 90 heats the opening end 11 side of the preform 1, it is more preferable that the vicinity of the support ring 12 side is cooled. For example, the cooling device 94 provided in the center of the holder 91 cools the support ring 12 side. And it prevents that the heat processing part 92 heats the opening end 11 side too much through the holder 91. Therefore, by providing the cooling device 94, the range in which the preform 1 is heated can be locally limited on the opening end 11 side. In addition, it is more preferable that the vicinity of the support ring 12 side is cooled in advance before the opening end 11 side is heated in order to locally limit the heated range on the opening end 11 side.

  Here, although the method of directly heat-treating with the heater is exemplified as the method of heat-treating the opening end 11 side of the preform 1, it is sufficient that the opening end 11 side is partially heat-treated. Is not limited. For example, a method of supplying hot air, a method using radiant heat of an infrared lamp, or a method of immersing in an oil bath may be used. Furthermore, a method using high frequency dielectric heating may be used.

  Next, the structure of the plastic bottle formed in the manufacturing method of the filling body which concerns on this embodiment is demonstrated in detail. FIG. 5 is a front view showing a PET bottle 2 as an example of a plastic bottle according to the present embodiment. The PET bottle 2 illustrated in FIG. 5 is a square bottle having a substantially square cross-sectional view in the horizontal direction. The PET bottle 2 has a mouth portion 10, a shoulder portion 20, a trunk portion 30, and a bottom portion 40. As described above, the configuration of the mouth 10 of the PET bottle 2 is the same as the configuration of the mouth 10 of the preform 1. The mouth portion 10 of the PET bottle 2 is in a partially crystallized state. In other words, the mouth portion 10 of the PET bottle 2 is configured such that the opening end 11 side has a higher density than the support ring 12 side.

  The upper side of the shoulder portion 20 is continuous with the lower surface of the support ring 12 of the mouth portion 10, while the lower side is continuous with the trunk portion 30. The shoulder portion 20 has a substantially quadrangular pyramid shape that expands from the upper side to the lower side. The shoulder portion 20 preferably has a straight portion 21 having a length L extending in the vertical direction from the connection end with the body portion 30. The shoulder portion 20 can have good shapeability by the configuration having the straight portion 21.

  The body portion 30 has a substantially regular rectangular tube shape as a whole, with four wall portions 31 having the same shape connected to each other in the circumferential (horizontal) direction. Each of the wall portions 31 includes a pressure absorbing panel 32 that is recessed inward by one step. The pressure absorbing panel 32 has a function of absorbing the pressure change inside the PET bottle 2, particularly the pressure reduction, and maintaining the strength of the PET bottle 2, particularly the side wall strength that can withstand the horizontal load of the body portion 30. Have

  The pressure absorption panel 32 has a stepped wall surface 33 that is recessed inwardly by one step from the surface of the surrounding wall portion 31 and a shape that is further recessed inwardly from the stepped wall surface 33 and is opposite to the opposite side of the stepped wall surface 33. And a plurality of concave ribs 34 (ribs). Furthermore, an inclined surface that surrounds the step wall surface 33 and is inclined with respect to the step wall surface 33 is formed. The wall portion 31 and the step wall surface 33 are connected by an inclined surface.

  The step wall 33 constituting the pressure absorbing panel 32 is curved inward of the PET bottle 2 in the horizontal direction from the left and right ends toward the center. On the other hand, also in the vertical direction, the stepped wall surface 33 may be curved inward from the PET bottle 2 from the upper and lower ends toward the center. With this configuration, even if the PET bottle 2 becomes positive pressure, the step wall surface 33 of the pressure absorption panel 32 is not deformed until it becomes vertical, and then when the PET bottle 2 becomes negative pressure, It can be made to show a behavior of bending. Thus, the stepped wall surface 33 is preferably configured to be sealed inward after being filled with a high-temperature liquid and maintained inwardly curved until cooled to room temperature.

  On the surface of the step wall surface 33, there is a concave rib 34 that extends continuously from the left end to the right end of the step wall surface 33. The concave ribs 34 are preferably designed so that the number and dimensions thereof are appropriate. In the illustration of FIG. 5, nine concave ribs 34 are arranged at equal intervals over the entire area in the vertical direction from the upper end to the lower end of the stepped wall surface 33. By appropriately arranging the concave ribs 34, it is possible to sufficiently exhibit the reduced-pressure absorption function, and furthermore, the effect of dispersing the stress applied to the PET bottle 2 and reinforcing the PET bottle 2 can be sufficiently obtained. .

  The concave rib 34 may be formed to have a constant depth, but is preferably formed to be deeper from the left and right ends toward the center. According to the configuration in which the concave rib 34 is deepest in the center, it is possible to prevent the concave rib 34 from easily protruding to the outside of the PET bottle 2 due to the positive pressure.

  The PET bottle 2 is slightly permeable to oxygen. And when the preservation | save in PET bottle 2 extends for a long period, depending on the content, oxidation will occur and the inside of PET bottle 2 will be pressure-reduced by this. In addition, the internal pressure of the PET bottle 2 varies depending on the temperature difference between the filling of the contents and the storage. The PET bottle 2 that has been depressurized inside is pulled inward and deformed. At this time, the pressure absorbing panel 32 is easily deformed inward by extending the uneven surfaces of the stepped wall surface 33 and the concave rib 34. The pressure absorption panel 32 plays a role of preventing deformation of the entire PET bottle 2 by being recessed inward of the PET bottle 2 when the inside of the PET bottle 2 is depressurized. That is, the pressure absorption panel 32 is configured not to protrude outward from the wall portion 31 of the PET bottle 2 but to be recessed to some extent inward.

  The pressure absorbing panel 32 plays a role of preventing deformation of the entire PET bottle 2 even when the pressure inside the PET bottle 2 is increased. With the pressure absorbing panel 32 having such a configuration, when the PET bottle 2 is opened, it is possible to prevent the wall of the PET bottle 2 from being pressed inward and the contents being pushed out from the mouth portion 10 and spilled. . And the pressure absorption panel 32 can improve the rigidity of the trunk | drum 30. FIG.

  The wall portion 31 of the PET bottle 2 is a portion where a label is attached. The label is attached by, for example, a shrink label that is shrunk by applying heat to a heat-shrinkable film such as cylindrical polystyrene (PS: PolyStyrene) or polyethylene terephthalate placed on the PET bottle 2. And since the dimension of a cylindrical heat-shrinkable film is decided to the predetermined value, when the wall part 31 is swollen, the malfunction that a heat-shrinkable film is blocked | filled or does not enter arises.

  However, by providing the pressure absorbing panel 32, the outward protrusion of the wall portion 31 is prevented, the label is smoothly attached, and the productivity can be improved. Furthermore, by providing the pressure absorption panel 32, it is possible to maintain a good appearance of the product in which the PET bottle 2 is filled with the contents, and to prevent a reduction in the product value.

  As described above, the pressure absorbing panel 32 is preferably provided with a plurality of concave ribs 34 extending in the horizontal direction in terms of pressure distribution, but a concave or convex shape extending in any direction is not shown. You may have a rib.

  Further, in the case of a convex rib, it is preferable that the convex portion of the rib is designed not to protrude outward from the surface of the wall portion 31 when the PET bottle 2 is under positive pressure. Therefore, when the PET bottle 2 is under positive pressure, the convex rib is not visible when the PET bottle 2 is viewed from the side of the protruding direction of the convex rib. The rib configured in this way does not affect the size of the opposite surface of the PET bottle 2. Therefore, the PET bottle 2 according to the present embodiment is excellent in the loading efficiency of boxing on cardboard or the like. Furthermore, the PET bottle 2 according to the present embodiment also has an effect that does not affect the mounting of the shrink label.

The PET bottle 2 preferably has an annular lateral groove 35 that crosses the wall portion 31 above and below the pressure absorption panel 32. The lateral groove 35 has a function of improving the side wall strength. The lateral groove 35 can also be used for alignment when a label is attached.

  On the other hand, when even one horizontal reinforcing rib such as the lateral groove 35 exists, it becomes a cushion, and the displacement increases although it does not buckle with respect to the load in the vertical direction. And the buckling strength which is the intensity | strength which can endure the load of the up-down direction in the range with small displacement falls. Therefore, when the lateral groove 35 is formed, the PET bottle 2 preferably has a longitudinal groove 36 extending in the longitudinal direction between the adjacent wall portions 31. The longitudinal groove 36 improves the buckling strength of the trunk portion 30. At least one vertical groove 36 is formed at the same location. In some cases, two to three longitudinal grooves 36 may be formed at the same location. However, when the number of the longitudinal grooves 36 is too large, the unevenness increases and the formability deteriorates. In addition, in the case where the PET bottle 2 has a configuration having the lateral groove 35, it is preferable that the straight portion 21 of the shoulder portion 20 described above is formed longer from the viewpoint of formability.

  The lowermost region of the body part 30 is a heel part 37. When the PET bottle 2 is molded from the preform 1, the heel portion 37 has a long distance from the bottom portion 18 (see FIG. 1) of the preform 1, and the stretch ratio increases accordingly. It is a spot that tends to whiten.

  The bottom portion 40 is continuous with the bottom portion of the trunk portion 30 at the top. The bottom 40 has a bottom wall 41 and a dome 42. The substantially flat annular bottom wall 41 extends in a direction perpendicular to the body portion 30 and serves as a ground contact surface of the PET bottle 2. The dome 42 is configured to protrude from the bottom wall 41 to the inside (upward) of the PET bottle 2 on the inner periphery of the bottom wall 41, and has a function of improving the strength of the bottom portion 40. The dome 42 is preferably provided with a plurality of ribs (not shown) having a function of reinforcing the dome 42 in a radial manner in a bottom view.

  The height h from the bottom wall 41 to the central portion 42c of the dome 42 may be designed to be maintained higher than the ground contact surface of the PET bottle 2 even if the dome 42 is deformed by heat. Even if it deforms by this, it is prevented from projecting outward from the bottom wall 41, and rattling or falling of the PET bottle 2 can be prevented. Therefore, the filling body can be produced in-line with a good appearance, and the transportability and loading efficiency of the filling body can be prevented from decreasing. In addition, the structure of the bottom part 40 is not restricted to the illustration of FIG. 5, Even if it forms positive pressure in the state which is easy to deform | transform by heat, what is necessary is just to be comprised so that it does not protrude outside.

  The distance from the lower surface of the support ring 12 to the bottom wall 41 at the lower end of the bottom portion 40 is the height H <b> 2 of the trunk portion 30. Furthermore, the distance between the pair of opposite sides in the body part 30 is the outer diameter D4 of the body part 30 of the PET bottle 2.

  The shape below the support ring 12 of the PET bottle 2 is not limited to the example shown in FIG. 5 and the like, and is formed by blow-molding the preform 1 and is not excessively deformed by heat and positive pressure. As long as it is a bottle that can absorb the water and keep its shape, it may be any shape, for example, a round bottle. And the shape of the pressure absorption panel 32 formed in the trunk | drum 30, the horizontal groove 35, and the vertical groove 36 can also be freely designed in the range in which the effect fully functions.

  The PET bottle 2 according to this embodiment is not limited by size, and can be applied to various sizes. For example, the volume of the PET bottle 2 may be 100 ml or more and 2000 ml or less. The total height of the PET bottle 2 may be 100 mm or more and 300 mm or less, and the outer diameter D4 of the trunk portion 30 may be 30 mm or more and 80 mm or less. Furthermore, the PET bottle 2 according to the present embodiment can be suitably used for a light weight bottle. For example, the mass of the PET bottle 2 may be 20 g or more and 40 g or less for 1000 ml, and 15 g or more and 25 g or less for 500 ml.

  With the configuration described above, even if the mouth portion 10 has a shape that is widely used for normal temperature filling, a PET bottle in which deterioration in sealing performance due to shrinkage or deformation due to high-temperature liquid to be filled is suppressed. 2 can be provided.

  In addition, the PET bottle 2 having the mouth portion 10, the shoulder portion 20, the trunk portion 30, and the bottom portion 40 formed in this way, the contents filled in the PET bottle 2, and the PET filled with the contents The cap 60 that seals the bottle 2 constitutes the filler according to this embodiment.

  Next, the filling body manufacturing apparatus according to this embodiment will be described in detail. FIG. 6 is a schematic view schematically showing the manufacturing apparatus 100 for the filling body 80 according to the present embodiment. The manufacturing apparatus 100 for the filling body 80 according to the present embodiment includes a heating unit that heats the body portion 15 of the preform 1 that has been heat-treated so that the opening end 11 side has a higher density than the support ring 12 side. , A molding part for blow-molding the PET bottle 2 from the preform 1 using a mold, a filling part for filling the PET bottle 2 with a high-temperature liquid, and a mounting part for attaching the cap 60 to the mouth part 10 of the PET bottle 2 And an overturning sterilization unit that inverts and sterilizes the mouth 10 of the PET bottle 2 and the cap 60, and a cooling unit that cools the PET bottle 2. And the manufacturing apparatus 100 of the filling body 80 which concerns on this embodiment is all in-line systems, such as the apparatus which shape | molds the PET bottle 2 from the preform 1 which is a preformed body, and the apparatus which fills the PET bottle 2 with a high temperature liquid. It is characterized by comprising.

  The in-line method here may be a (synchronized) method in which the molding part and the filling part are connected, or a separate type in which the PET bottle 2 is air-conveyed by separating the molding part and the filling part. good. Further, in various apparatuses configured in an in-line manner in the manufacturing apparatus 100 for the filling body 80 according to the present embodiment, an injection molding apparatus for forming the preform 1 and an opening end 11 side of the preform 1 are crystallized. A crystallization apparatus 90 for the preform 1 to be converted may be included.

  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 1 is formed into a bottle shape, the preform 1 is first heated.

  FIG. 7 is a cross-sectional view showing an example of the heating device 111 of the preform 1. FIG. 7 shows a cross section perpendicular to the conveying direction of the preform 1.

  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 1 in order to uniformly heat the body portion 15 of the preform 1 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 1 to a temperature suitable for blow molding, for example, 115 ° C. or higher and 135 ° C. or lower. Furthermore, the heating device 111 is used for reflecting the heat from the heater 114 to the body portion 15 of the preform 1 and for preventing the heat from the heater 114 from escaping 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 1 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 1 and the PET bottle 2 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 2 to be formed and, 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, 90 ° 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) on at least a part of its surface, more specifically, a portion that contacts the heel portion 37 of the PET bottle 2. 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 37 is a portion that is generally difficult to mold. This is particularly noticeable at the heating temperature of the preform 1 and the surface temperature of the body die 117a set in the manufacturing apparatus 100 for the filling body 80 according to the present embodiment. However, by providing the rough surface portion 117R at the place where it comes into contact with the heel portion 37, the mold release is improved and the local excessive shrinkage is prevented, and as a result, the shapeability of the PET bottle 2 is improved. .

  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 1 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 1 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 1 in the transverse (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 inject the hot liquid sterilized contents such as the beverage 50 into the PET bottle 2 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. It is configured. The capper 122 as the mounting portion is configured to mount the cap 60 on the mouth portion 10 of the PET bottle 2 filled with the beverage 50. The PET bottle 2 is hermetically sealed by the attached cap 60 to form a filling body 80.

  The overturning sterilizer 130 as the overturning sterilization unit inclines the filling body 80 for a predetermined time, for example, 30 seconds 90 degrees or more, and the heat of the high-temperature beverage 50 causes the inside of the filling body 80, particularly the mouth of the PET bottle 2. It is comprised so that the part 10 and the cap 60 may be disinfected. The sterilization time is appropriately designed according to the type of beverage 50 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 70 ° C. and heats and sterilizes the filling body 80 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 80 (PET bottle 2) is cooled by spraying water. Cooling by the path riser 140 has an effect of preventing a change in the flavor of the beverage 50 filled in the filling body 80. The temperature of the liquid stored in the first tank of the path riser 140 is preferably 70 ° C. or lower. By rapidly cooling the filling body 80 at 70 ° C. or less, damage to the body 30 of the PET bottle 2 due to heat can be reduced.

  The manufacturing apparatus 100 of the filling body 80 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 80 (PET bottle 2). The caser packs the filling body 80 in a cardboard every predetermined number, for example, 24 pieces. The filling body 80 according to the present embodiment is manufactured using the above-described apparatuses and the like.

  Next, the manufacturing method of the filler 80 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 80 according to the present embodiment. In the present embodiment, at least the step of heating the body portion 15 of the preform 1 that has been heat-treated so that the density at the opening end 11 side is higher than the density at the support ring 12 side, and the mold 117 from the preform 1 A step of blow-molding the PET bottle 2, a step of filling the PET bottle 2 with the high-temperature beverage 50, a step of attaching the cap 60 to the mouth portion 10 of the PET bottle 2, and the mouth portion 10 of the PET bottle 2 A step of sterilizing the cap 60 by overturning and a step of cooling the PET bottle 2. The present embodiment is characterized in that all processes such as molding of the PET bottle 2 from the preform 1 and filling of the hot beverage 50 into the PET bottle 2 are performed in an in-line manner. Below, each process is demonstrated in detail.

  First, the preform 1 is supplied to the bottle molding machine 110 (step S1). In addition, as described above, the manufacturing apparatus 100 for the filling body 80 according to the present embodiment may include an injection molding apparatus, a compression molding apparatus, a compression injection molding apparatus, and the like that form the preform 1 configured in an in-line manner. good. In this case, the preform 1 supplied to the bottle molding machine 110 is formed by an in-line method using an injection molding apparatus. The preform 1 is supplied to the bottle molding machine 110 by a cold parison method, a hot parison method, or an inline method.

  Furthermore, as described above, the manufacturing apparatus 100 for the filling body 80 according to the present embodiment includes the crystallization apparatus 90 that performs the heat treatment so that the density of the opening end 11 side is higher than that of the support ring 12 side. It may be configured in an inline manner. Note that the crystallization apparatus 90 and the manufacturing apparatus 100 for the filling body 80 do not have to be configured in an in-line manner. In this case, the crystallization apparatus 90 and the injection molding apparatus that forms the preform 1 are included. It is preferably configured in an in-line manner. In the manufacturing method of the filling body 80 according to the present embodiment, the preform 1 is used in which the opening portion 11 side is heat-treated by the crystallization apparatus 90 from the state in which the mouth portion 10 is amorphous. The supplied preform 1 is conveyed after being aligned.

  Next, the preform 1 is heated (step S2). The body portion 15 of the preform 1 conveyed to the heating device 111 of the bottle molding machine 110 is heated by a plurality of heaters 114 to a temperature of 115 ° C. or more and 135 ° C. or less, for example.

  When the temperature of the preform 1 to be heated is less than 115 ° C., the heat resistance is insufficient, and the PET bottle 2 formed thereafter cannot cope with hot filling that fills the high-temperature contents. , Transforms into an irregular shape. On the other hand, when the temperature of the preform 1 to be heated exceeds 135 ° C., the preform 1 before bottle molding is excessively crystallized and blow molding cannot be performed. In that respect, if the temperature of the preform 1 to be heated is 135 ° C. or lower, crystallization proceeds somewhat, but blow molding is possible.

  Next, blow molding of the PET bottle 2 is performed by stretching the preform 1 (step S3). The heated preform 1 is mounted on the mold 117 of the biaxial stretch blow molding apparatus 112. In the manufacturing method of the filling body 80 according to the present embodiment, the surface temperature of the body die 117a is 90 ° 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 2, in particular, the body portion 30 is crystallized, and the structure has heat resistance. Therefore, the PET bottle 2 that can be filled with the high-temperature beverage 50 in the subsequent process can be produced. When the surface temperature of the body mold 117a is lower than 90 ° 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 2 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 this embodiment, the effect is embodied when both the temperature of the preform 1 to be heated and the temperature of the surface of the body die 117a exceed a certain level. The temperature of the body portion 15 of the preform 1 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 1 attached to the mold 117 is stretched in the longitudinal direction by the stretching rod 118. In this case, the longitudinal stretching ratio from the preform 1 to the PET bottle 2 is preferably 1.8 or more and 4.0 or less. Here, the longitudinal stretch ratio means the height H2 of the body 30 of the PET bottle 2 relative to the height H1 (see FIGS. 1 and 8) of the body 15 of the preform 1 (see FIGS. 5 and 8). Ratio (H2 / H1). The molecules of the preform 1 having an amorphous structure that is an aggregate of an amorphous part and a crystal part undergo oriented crystallization by stretching, and as a result, the strength, rigidity, and heat resistance of the PET bottle 2 are increased. Therefore, the PET bottle 2 that can be filled with the high-temperature beverage 50 in the subsequent process can be produced. When the longitudinal stretching ratio is less than 1.8, the molecular orientation of the preform 1 does not increase, whereas when the longitudinal stretching ratio exceeds 4.0, the PET bottle 2 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 1. First, with 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 1 in the longitudinal direction, the preform 15 is stretched in the lateral direction so that it does not hit the body mold 117a (pre-blow). ) Thereafter, the body portion 15 of the preform 1 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 contacts the body mold 117a.

  In this case, the transverse stretch ratio from the preform 1 to the PET bottle 2 is preferably 1.8 or more and 3.0 or less. Here, the transverse draw ratio is the outer diameter D4 of the barrel 30 of the PET bottle 2 relative to the outer diameter D1 of the barrel 15 of the preform 1 (see FIGS. 1 and 8) (see FIGS. 5 and 8). Ratio (D4 / D1). The molecules of the preform 1 are similarly oriented and crystallized by stretching in the transverse direction. As a result, the strength, rigidity, and heat resistance of the PET bottle 2 are increased. Therefore, the PET bottle 2 that can be filled with the high-temperature beverage 50 in the subsequent process can be produced. When the transverse draw ratio is less than 1.8, the molecular orientation of the preform 1 does not increase. On the other hand, when the transverse draw ratio exceeds 3.0, the PET bottle 2 becomes difficult to mold.

  In order to prevent the body portion 30 of the PET bottle 2 from being crystallized excessively and becoming difficult to be stretched, it is determined in advance until the preform 1 is stretched to the shape of the PET bottle 2 after being mounted on the mold 117. It is controlled to fit in time.

  In the manufacturing method of the filling body 80 according to the present embodiment, cooling air may be further sprayed onto the PET bottle 2 during the blow molding process (step S4). FIG. 10 is a schematic view showing an example of spraying the cooling air C <b> 1 onto the PET bottle 2.

  The PET bottle 2 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 2. 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 blowing part 119, it is possible to improve the deformation due to the initial contraction when the PET bottle 2 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 1/10 to 4/5 that of the high-pressure air P2. More specifically, the time for blowing the cooling air C1 is 0.1 second to 1.5 seconds, and 1% to 90%, more preferably 60% to 80% 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 2. As soon as the barrel 30 of the PET bottle 2 touches the barrel die 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. Therefore, the body 30 of the PET bottle 2 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 2. Of the step of blowing the high-pressure air P2 in 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 60% to 80%. 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 2. By doing so, crystallization is also promoted on the outer surface side of the body portion 30 of the PET bottle 2. 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 2, so that 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 2 can be quickly lowered to reduce the speed required for producing the PET bottle 2. Furthermore, when the cooling air C1 is sprayed onto the body 30 of the PET bottle 2, 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 a PET bottle 2 having higher temperature heat resistance can be produced.

  The crystallinity of the body 30 of the PET bottle 2 is preferably 25% or more and 39% or less. If the degree of crystallinity is within this range, the PET bottle 2 having heat resistance can be molded from the preform 1 with good formability. In addition, the crystallinity degree of the trunk | drum 30 of PET bottle 2 can be derived | led-out from a density. In addition, the crystallinity of the body 30 of the PET bottle 2 can be evaluated by Raman spectroscopic analysis.

The density of the body part 30 of the PET bottle 2 produced by the method for producing the filling body 80 according to the present embodiment is 1.367 g / cm ³ or more and 1.380 g / cm ³ or less. The density of the body part 30 of the PET bottle 2 is the same as the density of the opening end 11 side and the support ring 12 side described above using a cut piece obtained by cutting a part of the body part 30 in, for example, 1 cm square as a sample. It can be measured by a specific gravity method, for example, a density gradient tube method. Whether or not the method for manufacturing the filling body 80 according to the present embodiment has been used by measuring the density of the body portion 30 of the PET bottle 2 in the filling body 80 manufactured by the manufacturing apparatus 100 configured in an in-line method. Can be determined.

  Furthermore, the tensile fracture strain of the body part 30 of the PET bottle 2 produced by the method for producing the filler 80 according to the present embodiment is 40% or more and 68% or less.

  As a method of measuring the tensile fracture strain of the barrel 30 of the PET bottle 2, a sample obtained by cutting a part of the barrel 30 into, for example, a short side of 10 mm and a long side of 50 mm is used as a sample. One side is fixed and then pulled in the long-side direction at 85 ° C. and 300 mm / min. And the tensile fracture distortion of the trunk | drum 30 of PET bottle 2 can be investigated by measuring what percentage cut | disconnects when it pulls. Whether or not the method for manufacturing the filler 80 according to the present embodiment has been used by measuring the tensile fracture strain of the body 30 of the PET bottle 2 in the filler 80 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 2 moves away from the mold 117. In the manufacturing method of the filling body 80 according to this embodiment, since it is an in-line method, the time for blow molding is shortened as much as possible, and the PET bottle 2 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 37 are in contact with each other instead of a solid surface, and the heel portion 37 contracts inward. There is no sinking without undulation. Therefore, the shapeability of the PET bottle 2 can be improved. Furthermore, in the manufacturing method of the filling body 80 according to this embodiment, the manufacturing time can be shortened as compared with the heat resistant bottle, the manufacturing efficiency can be increased, and the manufacturing cost can be reduced.

  The surface roughness (Ra) of the heel portion 37 of the PET bottle 2 manufactured by the method for manufacturing the filler 80 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 37, 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 2, particularly the heel portion 37, in the filling body 80 produced by the production apparatus 100 configured in an in-line method, the method for producing the filling body 80 according to the present embodiment. It can be determined whether or not is used.

  Next, as shown in FIG. 9, the PET bottle 2 is supplied to the hot filling machine 120 (step S5). Since the manufacturing apparatus 100 for the filling body 80 according to the present embodiment is configured in an in-line manner, the molded PET bottle 2 is promptly supplied to the hot filling machine 120. The supplied PET bottle 2 is sequentially delivered by, for example, grippers attached to the outer peripheral portions of a plurality of rotating disc-shaped transport wheels, and is carried to the filler 121. In addition, it is preferable that the time until the hot bottle filling machine 120 is supplied after molding the PET bottle 2 is within 10 seconds. Thus, since the manufacturing method of the filling body 80 which concerns on this embodiment is an in-line system, the PET bottle 2 is used for filling of the drink 50 in the state with little heat resistance fall by humidification.

  On the other hand, in the hot filling machine 120, the sterilization of the beverage 50 filled in the PET bottle 2 is performed (step S6). The warm sterilization is appropriately set at a predetermined temperature and holding time such as 4 minutes at 120 ° C. or 30 minutes at 85 ° C. according to the characteristics of the beverage 50 such as acidity and water activity. .

  Then, the beverage 50 is filled into the PET bottle 2 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 50 into the PET bottle 2 as it is 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. Similarly, the PET bottle 2 filled with the beverage 50 is sequentially delivered by the gripper and is carried to the capper 122.

  The PET bottle 2 produced 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 2 has sufficient heat resistance to be filled with the high-temperature beverage 50 having the above-described temperature range, for example, 71 ° C. or more and 95 ° C. or less, more preferably 81 ° C. or more and 90 ° C. or less. It is produced. And in the manufacturing method of the filling body 80 which concerns on this embodiment, the method of filling the drink 50 at the time of maintaining the most heat resistance immediately after the PET bottle 2 was shape | molded is used. Therefore, according to the manufacturing method of the filling body 80 according to the present embodiment, the high temperature beverage 50 can be filled in the PET bottle 2 without any problem.

  As described above, the PET bottle 2 can be filled with the high-temperature beverage 50. For this reason, for example, the inner surface of the PET bottle 2 can be sufficiently sterilized with a high-temperature beverage 50 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 breeding aerobic bacteria is extremely low even if oxygen is enclosed with the beverage 50 in the filling body 80 by performing sufficient sterilization, the beverage 50 is not always fully filled in the PET bottle 2. It doesn't matter. Therefore, according to the method according to the present embodiment, the propagation of bacteria on the outer surface of the PET bottle 2 that is more likely to occur as the filling is full, and the opening end of the mouth portion 10 that is more likely to occur as the beverage 50 is hot. The thermal deformation on the 11 side can be effectively prevented.

  Note that, as described above, in the method for manufacturing the filling body 80 according to the present embodiment, the blow molding of the PET bottle 2 and the filling of the beverage 50 into the PET bottle 2 are performed in an inline manner. No. 2 is maintained in a high heat resistance state. However, from the viewpoint of further maintaining the heat resistance of the PET bottle 2, at least the PET bottle 2 is blow-molded in the manufacturing apparatus 100 of the filling body 80 and then the beverage 50 is filled into the PET bottle 2. It is even better if the PET bottle 2 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 60 is supplied to the capper 122 of the hot filling machine 120 (step S8). In addition, although the cap 60 may be sterilized by, for example, ultraviolet irradiation, in the method for manufacturing the filling body 80 according to the present embodiment, the cap 60 is not sterilized before the beverage 50 is filled. There may be. In addition, by sterilizing the cap 60, the filling temperature of the beverage 50 and the temperature of the pastorizer 140 can be lowered, and the heat resistance of the PET bottle 2 required for manufacturing the filling body 80 can be lowered. it can.

  In the capper 122, the cap 60 is attached to the PET bottle 2 (step S9). Thereby, the filling body 80 according to the present embodiment is formed. In the present embodiment, the opening end 11 side is heat-treated so as to have a higher density than the support ring 12 side and has heat resistance, so that deformation does not occur when the cap 60 is attached, The PET bottle 2 can be reliably sealed. 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 80 is transported to the overturning sterilizer 130 by a transport belt such as a conveyor.

  Next, the filling body 80 is overturned and sterilized by the overturning sterilizer 130 (step S10). The overturning sterilizer 130 conveys the filler 80 while lying down, for example. The cap 60 and the inner surface of the PET bottle 2, particularly in the vicinity of the mouth 10, are sterilized by coming into contact with the high-temperature beverage 50 when the filling body 80 is turned over. In the present embodiment, the opening end 11 side is heat-treated so as to have a higher density than the support ring 12 side, and has heat resistance. The state in which the bottle 2 is sealed can be reliably maintained.

  Subsequently, the filling body 80 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 70 ° C. or lower. By rapidly cooling the filler 80 at 70 ° C. or lower, damage to the mouth 10 of the PET bottle 2 due to heat can be reduced. After that, the liquid temperature of the beverage 50 inside the filling body 80 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 80 by the labeler and the caser 150 and then packed in a cardboard box. The filler 80 according to this embodiment is manufactured by the above method.

  The reduced pressure amount of the filling body 80 produced by the method for producing the filling body 80 according to the present embodiment is 1 kPa or more and 15 kPa or less. The amount of pressure reduction of the filler 80 can be measured by a pressure gauge, for example, a diaphragm type pressure gauge. The measurement of the amount of reduced pressure is performed by inserting a piercing needle communicating with a detector provided in the pressure gauge into the head space of the filling body 80. It is possible to determine whether or not the method for manufacturing the filler 80 according to the present embodiment has been used by measuring the amount of pressure reduction of the filler 80 manufactured by the manufacturing apparatus 100 configured in an in-line method. In addition, the value according to the content is suitably set to the pressure reduction amount of the filling body 80 in this case.

  By providing each process described above, manufacturing of the filling body 80 in which the PET bottle 2 having heat resistance applicable to hot filling and the filling body 80 in which the beverage 50 is hot-filled is produced in-line. A method can be provided. In addition, since the preform 1 and the PET bottle 2 according to the present embodiment have sufficient heat resistance on the opening end 11 side, if the body portion 30 side of the PET bottle 2 has sufficient heat resistance, It can also be applied to non-in-line manufacturing methods.

  According to the manufacturing method of the filling body 80 according to the present embodiment, unlike a method in which a plastic bottle molded in advance is supplied to the filling device for contents, the high temperature can be obtained without taking time from the PET bottle 2 being molded. The process of filling the beverage 50 can proceed. For this reason, filling is started before the crystallinity degree of the trunk | drum 30 of PET bottle 2 falls, and the hot drink 50 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 2 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 80 according to the present embodiment, it is possible to fill the hot beverage 50 even if the heat resistance of the PET bottle 2 is lower than that of the widely used heat-resistant bottle. Thus, the temperature of the body die 117a can be lowered. For this reason, according to the manufacturing method of the filling body 80 which concerns on this embodiment, it can prevent that the problem mentioned above arises.

  Furthermore, according to the manufacturing method of the filling body 80 according to the present embodiment, an in-line method is used in which the PET bottle 2 can be molded at a higher speed than a method in which a pre-molded plastic bottle is supplied to the content filling device. Therefore, the manufacturing cost of the filler 80 can be reduced.

  Furthermore, according to the manufacturing method of the filling body 80 according to the present embodiment, since the method in which the preform 1 is supplied instead of the PET bottle 2 is used, the cost of transporting the material can be reduced. That is, when the PET bottle 2 is molded in-line, the shape of the container supplied to the manufacturing apparatus 100 for the filling body 80 can be changed to the preform 1 having a smaller volume than the PET bottle 2. 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 80 according to the present embodiment in which the bottle molding machine 110 of the PET bottle 2 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 filler 80 according to another embodiment will be described in detail. FIG. 11 is a flowchart showing an outline of the manufacturing process of the filler 80 according to another embodiment. The manufacturing method of the filling body 80 according to another embodiment is characterized in that the step (step S4) of blowing the cooling air C1 to the PET bottle 2 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 2 is blow-molded by stretching the preform 1 as in the manufacturing method shown in FIG. 9 (step S3). However, in the manufacturing method of the filling body 80 according to another embodiment, the surface temperature of the body die 117a is set to 90 ° C. or higher and 115 ° C. or lower.

  Also here, it is preferable that the temperature of the body portion 15 of the preform 1 heated in step S2 is 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 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 1 attached to the mold 117 is stretched in the longitudinal direction by the stretching rod 118. Further, the body portion 15 of the preform 1 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 method for manufacturing the filler 80 according to another embodiment, the blowing of the cooling air C1 (step S4) to the PET bottle 2 is omitted during the blow molding process. However, in the manufacturing method of the filling body 80 according to another embodiment, the temperature of the surface of the body die 117a is 90 ° C. or more and 115 ° C. or less, and the temperature of the body portion 15 of the preform 1 to be heated is The temperature is made higher than the surface temperature of the body die 117a. Thereby, the initial shrinkage when the body portion 15 of the preform 1 is stretched and hits the body mold 117a is effectively suppressed. Therefore, in the manufacturing method of the filling body 80 according to another embodiment, the PET bottle 2 having heat resistance applicable to hot filling, even if the step (step S4) of blowing the cooling air C1 to the PET bottle 2 is omitted, And the filling body 80 by which the drink 50 was hot-filled can be produced.

  The blown PET bottle 2 is supplied to the hot filling machine 120 (step S5), and thereafter, the filling body 80 is manufactured through the same steps as the manufacturing method shown in FIG. .

  The manufacturing method of the filling body 80 according to another embodiment has the same effects as the manufacturing method shown in FIG.

  In addition, in the method of manufacturing the filling body 80 according to another embodiment, the temperature of the surface of the body mold 117a can be set lower, so that the material of the mold 117 can be, for example, stainless quenching and tempering 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 manufacturing method of the filler 80 according to another embodiment, an apparatus for spraying the cooling air C1 can be eliminated. 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 80 according to another embodiment, the step of blowing the cooling air C1 (step S4) is unnecessary, and therefore the production of the filling body 80 in which the PET bottle 2 and the beverage 50 are hot-filled is performed. Speed can be improved.

  As described above, the method for manufacturing the filling body 80 according to the present embodiment is such that the body of the preform 1 that is heat-treated so that the density at the opening end 11 side is higher than the density at the support ring 12 side. A step of heating the portion 15, a step of blow-molding the PET bottle 2 from the preform 1 using the mold 117, a step of filling the PET bottle 2 with the high-temperature beverage 50, and the mouth portion 10 of the PET bottle 2 It comprises a step of attaching a cap 60, a step of sterilizing the mouth portion 10 of the PET bottle 2 and the cap 60, and a step of cooling the PET bottle 2, and performing all steps in an inline manner. .

  Furthermore, the PET bottle 2 has heat resistance to the hot beverage 50 to be filled by the method for manufacturing the filling body 80 according to the present embodiment, and the inner ring 65, the contact ring 66, and the outer ring of the cap 60 to be attached. 67 which is sealed by 67 and to which the cap 60 is mounted from the open end 11 side, a shoulder 20 connected to the support ring 12 of the mouth 10, a body 30 connected to the shoulder 20, and a body 30 and a bottom portion 40 connected to the inner ring 65, and the opening end 11 side including the contact portion with the inner ring 65, the contact ring 66, and the outer ring 67 has a higher density than the support ring 12 side. .

  And according to this embodiment, even if the opening | mouth part 10 is the shape widely used for normal temperature filling normally, the fall of the sealing performance resulting from shrinkage | contraction and deformation | transformation by the hot drink 50 filled is suppressed. The preform 1, the manufacturing method of the preform 1, the crystallization apparatus 90 of the preform 1, the PET bottle 2, and the manufacturing method of the filler 80 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 preform 1 made of polyethylene terephthalate and having an amorphous mouth 10 was prepared in advance. The preform 1 is attached to a holder 91 of a crystallization apparatus 90 for a preform 1 configured to suppress deformation on the side of the open end 11, and the open end 11 side of the mouth 10 is attached by a heat treatment unit 92. Crystallized upon heating. In this way, the profile having the characteristics according to the present embodiment, such as the density of the opening end 11 side including the contact portion with the inner ring 65, the contact ring 66, and the outer ring 67 is higher than the support ring 12 side. Reform 1 was formed. That is, the preform 1 was formed such that the density on the open end 11 side was 1.375 g / cm ³ and the density on the support ring 12 side was 1.361 g / cm ³ .

  And the filling body 80 was produced with the manufacturing method of the filling body 80 which concerns on this embodiment shown by FIG. At that time, the body portion 15 of the preform 1 was heated to 125 ° C., and the temperature of the surface of the body mold 117 a was 125 ° C. The blow molding step (step S3) included a step (step S4) of blowing the cooling air C1 onto the PET bottle 2. The temperature of the hot beverage 50 to be filled was 90 ° C. The cap 60 to be mounted was an M cap manufactured by Nippon Closure Co., Ltd., which is widely used for filling at room temperature.

[Comparative Example 1]
A preform made of polyethylene terephthalate and widely used as a crystallization port was used. The preform was made into a crystallization port by a mouth crystallization apparatus (manufactured by Osaka Cold Research Co., Ltd.). Then, in the same manner as in Example 1, a filler was produced by the method for producing the filler 80 according to this embodiment shown in FIG.

[Comparative Example 2]
A preform made of polyethylene terephthalate and widely used as a non-crystallizing port was used. Then, in the same manner as in Example 1, a filler was produced by the method for producing the filler 80 according to this embodiment shown in FIG.

<Evaluation method>
(Dimension inspection)
For each of the preforms of Example 1, Comparative Example 1, and Comparative Example 2, the inner diameter, the outer diameter, and the height of the mouth were measured. In addition, about each of Example 1 and Comparative Example 1, it measured before and after crystallization. An evaluation was made as to whether it was within a range of dimensions corresponding to the PCO 1810 standard. Table 1 shows the results of the dimensional inspection evaluation of each preform, and is indicated by ◯: within the standard and x: non-standard.

(Sealing test)
Whether or not each filling body of Example 1, Comparative Example 1 and Comparative Example 2 was immersed in water and 0.5 MPa of air was injected from the upper part 62 of the cap 60 for 1 minute, bubbles were generated in the water. confirmed. ○: Not leaked, ×: leaked.

(Comprehensive evaluation)
Based on the above-described dimensional inspection and sealability inspection, comprehensive evaluation of each preform (each filler) of Example 1, Comparative Example 1, and Comparative Example 2 was performed. Table 1 shows the results of comprehensive evaluation. Comprehensive evaluation is described by (circle): favorable and x: no aptitude.

  The following points were derived from the examples described above. As shown in Table 1, in Example 1, a change in dimensions before and after crystallization was suppressed, and deformation of the mouth 10, particularly the opening end 11 side, due to heating was suppressed. In Example 1, there was no leakage from between the mouth portion 10 and the cap 60, and the sealing performance was good. In Comparative Example 1, since the opening end side deformation due to heating was not suppressed when the crystallization port was used as the crystallization port by the mouth crystallization apparatus, it was not within the size range corresponding to the PCO1810 standard after crystallization. There was a thing. In Comparative Example 2, the opening end was deformed, liquid leakage occurred, and it did not have sealing properties.

  From the results of the above examples, in the method for manufacturing the preform 1 according to this embodiment, the dimensions change even when the heat treatment for imparting heat resistance to the preform 1 having the amorphous mouth portion 10 is performed. It was shown that the sealing property was good even when the hot beverage 50 was filled. And according to the manufacturing method of the filling body 80 which concerns on this embodiment, it was shown that the PET bottle 2 can be filled with the hot beverage 50 without a problem. Therefore, in the present embodiment, even if the mouth portion 10 has a shape that is widely used for normal temperature filling, the sealing performance is prevented from being deteriorated due to shrinkage or deformation due to the hot beverage 50 to be filled. It has been shown that a method for manufacturing the reform 1, the preform 1, the crystallization apparatus 90 for the preform 1, the PET bottle 2, and the filler 80 can be provided.

  The present disclosure can be suitably used for manufacturing various filling bodies 80 filled with liquid as contents. However, the present disclosure is not limited to the above-described embodiments and examples. The filling body 80 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, and carbonated beverages, or seasonings such as soy sauce, sauce, and mirin, Useful for all fillings 80 containing edible oils, foods including alcoholic beverages, detergents, shampoos, cosmetics, pharmaceuticals, etc., and the containers have heat resistance, so they are sold warmly in vending machines and stores. Also suitable for.

1 Preform 2 PET bottle (plastic bottle)
10 Portion 11 Open End 12 Support Ring 13 Male Screw (Screw)
15 body part of preform 1 20 shoulder part 30 body part of PET bottle 2 40 bottom part 50 beverage (liquid)
60 Cap 64 Female thread (screw)
65 Inner ring (blocking ring)
66 Contact ring
67 Outer ring (blocking ring)
DESCRIPTION OF SYMBOLS 80 Filling body 90 Crystallization apparatus 91 Holder 92 Heat processing part 100 Manufacturing apparatus of the filling body 110 Bottle molding machine 111 Heating apparatus (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)
a Vertical length on the open end 11 side b Vertical length on the support ring 12 side D2 Valley diameter of the external thread 13

Claims (16)

A preform for molding a plastic bottle having heat resistance against a hot liquid to be filled and sealed by a closure ring of a cap to be attached,
A mouth portion to which the cap is attached from the side of the open end;
A body part connected to the support ring of the mouth part,
The preform characterized in that the opening end side including the contact portion with the closing ring has a higher density than the support ring side. The preform according to claim 1, wherein the density difference between the opening end side and the support ring side is 0.004 g / cm ³ or more and 0.045 g / cm ³ or less. The preform according to any one of claims 1 to 2, wherein the mouth part is partially crystallized on the opening end side and the support ring side is amorphous. The preform according to any one of claims 1 to 3, wherein the opening end side is an area of 5 mm from the opening end toward the support ring. The mouth is
A screw that meshes with a screw formed on the cap;
The preform according to any one of claims 1 to 4, wherein a valley diameter of the screw is 26 mm or less, and an inner diameter of the mouth portion is 21.74 mm ± 0.13 mm. The preform according to any one of claims 1 to 5, wherein the temperature of the high-temperature liquid is 71 ° C or higher and 95 ° C or lower. The preform according to any one of claims 1 to 5, wherein the temperature of the high-temperature liquid is 81 ° C or higher and 90 ° C or lower. A method for producing a preform for molding a plastic bottle having heat resistance against a hot liquid to be filled and sealed by a closure ring of a cap to be attached,
The preform is
A mouth portion to which the cap is attached from the side of the open end;
A body part connected to the support ring of the mouth part,
A method for manufacturing a preform, wherein the opening end side including the contact portion with the closing ring is heat-treated so as to have a higher density than the support ring side. The method for manufacturing a preform according to claim 8, wherein the opening end side is heat-treated discontinuously in a circumferential direction. The preform manufacturing method according to claim 9, wherein heat treatment is performed at eight locations in the circumferential direction. The method for manufacturing a preform according to any one of claims 8 to 10, wherein heat insulation is performed between the opening end side and the support ring side. The method for manufacturing a preform according to any one of claims 8 to 11, wherein a side of the support ring is cooled. A preform crystallization apparatus for partially crystallizing a preform for molding a plastic bottle having heat resistance against a hot liquid to be filled and sealed by a closure ring of a cap to be attached,
A holder for holding the mouth of the preform;
A heat treatment part for heat-treating the mouth part,
The heat treatment part is configured to heat-treat the opening end side of the mouth part,
The preform crystallization apparatus, wherein the holder is configured in a shape that suppresses deformation of the heated opening end side. A plastic bottle that has heat resistance to the hot liquid to be filled and is sealed by a closure ring of a cap to be attached,
A mouth portion to which the cap is attached from the side of the open end;
A shoulder connected to the support ring of the mouth;
A body part connected to the shoulder part;
A bottom part connected to the body part,
The plastic bottle according to claim 1, wherein the opening end side including the contact portion with the closing ring has a higher density than the support ring side. A mouth portion to which a cap is attached from the open end side, and a body portion connected to a support ring of the mouth portion, and the mouth portion is formed from an amorphous preform and filled with a high-temperature liquid to be filled A method for producing a filling body in which the high-temperature liquid is filled in a plastic bottle having heat resistance,
Heating the body portion of the preform that has been heat-treated so that the opening end side has a higher density than the support ring side;
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;
And a step of cooling the plastic bottle. A step of heating the barrel, a step of blow molding the plastic bottle, a step of filling the liquid, a step of attaching the cap, a step of sterilizing the mouth and the cap by overturning, The method for producing a filler according to claim 15, wherein the step of cooling the plastic bottle is all performed in an in-line manner.

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