JP6743360B2 - Plastic bottle, filling body, and method for manufacturing filling body - Google Patents

Description

The present invention relates to a plastic bottle, a filling body, and a method for manufacturing a filling body, more specifically, a plastic bottle corresponding to a so-called hot filling for filling a liquid into a molded plastic bottle while sterilizing a liquid at a high temperature, a filling body, And a method for manufacturing a filling body.

A plastic bottle is often used as a container for filling a liquid such as a beverage as the content. In the production of plastic bottles, a method of molding a test tubular preform from a resin using an injection molding machine or the like and molding the preform into a bottle shape using a blow molding machine is often used. Then, as a method of filling the contents in the plastic bottle, there are so-called hot filling for filling the liquid at a high temperature (for example, 85° C.) into the plastic bottle and aseptic filling for filling the liquid at a normal temperature (for example, 30° C.). There is.

Since the aseptic filling does not require heat resistance of the plastic bottle, its molding is relatively easy. Therefore, in the aseptic filling method, there are many cases in which an aseptic filling system in which a blow molding machine for plastic bottles is in-line with the filling machine is formed. When a plastic bottle is molded in-line, the form of the container supplied to the aseptic filling system can be changed to a preform that is smaller in volume than the plastic bottle, greatly improving the transportation efficiency from the container manufacturer. , For example, it is possible to increase the number by 6 times or more. Therefore, the aseptic filling system with aseptic filling in which the blow molding machine for plastic bottles is in-line contributes to reduction of transportation cost of containers and reduction of environmental load.

On the other hand, as compared with the aseptic filling system using aseptic filling, a hot filling system is often used, which is a bottle purchase and can suppress initial cost without introducing a blow molding machine. However, in the method by hot filling, it is necessary to take measures to impart heat resistance to the plastic bottle so that the plastic bottle is not deformed by the high temperature liquid, and for example, it takes time to crystallize the mouth portion or the body portion. Yes, therefore the manufacturing capacity is low and the cost per bottle is high.

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

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 can be shortened, and thus the container can be used in an external environment. It is said that the amount of moisture absorbed from the container decreases, and the water content of the container can be kept low accordingly. Then, sufficient commercial sterility can be obtained by filling the contents into the container at a filling temperature (61 to 80° C.) within a temperature range below 61° C. and below the glass transition temperature determined by the water content of the container. Therefore, it is possible to use a mouthless amorphous polyester container whose glass transition temperature is within this temperature range.

However, in Patent Document 1, there is no description about inline installation of a blow molding machine for plastic bottles and a filling machine. That is, Patent Document 1 does not describe at all that a plastic bottle can be obtained in a state in which heat resistance is less likely to decrease due to humidification by being in-lined. Further, Patent Document 1 makes no mention of the effect of changes in heat and pressure on the container from the time the contents are filled until the contents are cooled.

Therefore, an object of the present invention is to manufacture a plastic bottle, a filling body, and a filling body which are produced in-line, have heat resistance applicable to hot filling, and are suppressed from being deformed due to a pressure change in the container during filling. To provide a method.

In order to solve the above-mentioned problems, the present invention is a rectangular plastic bottle molded from a preform having an amorphous mouth, and having heat resistance to a filled high-temperature liquid, wherein the high temperature is 81°C. As described above, the temperature is not higher than 90° C., the body portion has a wall portion, the wall portion has a pressure absorbing panel, and the pressure absorbing panel is horizontal between the step wall surface, the inclined surface, and the step wall surface. A plurality of ribs extending in a direction, the step wall surface is connected to the wall portion through the inclined surface and is recessed inward, and the step wall surface is in a horizontal state in the horizontal direction under normal pressure. From the left and right ends of the wall to the center, curved inward of the plastic bottle, sealed after being filled with the high temperature liquid , the pressure in the plastic bottle changed from positive pressure to negative pressure, and at room temperature It is characterized in that said inward curvature is maintained until cooled.

Moreover, the rib is recessed rib, characterized by more profoundly isosamples toward the left and right ends to the center.

The pressure absorbing panel is further characterized by being curved inward in the vertical direction from the upper and lower ends of the pressure absorbing panel toward the center.

Further, the surface roughness Ra of the body portion is 0.3 μm or more and 3 μm or less.

Further, the material forming the plastic bottle is polyethylene terephthalate, and the density of the body portion is 1.367 g/cm ³ or more and 1.380 g/cm ³ or less.

Further, the crystallinity of the body is 25% or more and 39% or less.

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

Further, the longitudinal draw ratio from the preform to the plastic bottle is 1.8 or more and 4.0 or less.

Further, the transverse stretching ratio from the preform to the plastic bottle is 1.8 or more and 3.0 or less.

Further, the shoulder portion has a straight portion extending in a vertical direction from a connection end with the body portion, and the length of the straight portion is formed to be 5 mm or more and 10 mm or less.

Further, the bottom portion includes a dome projecting inward from a substantially flat plate-shaped bottom wall, and ribs radially provided on the dome, and a height from the bottom wall to the central portion of the dome is 4 mm or more. , 20 mm or less.

Further, the present invention is a filling body comprising the above-mentioned plastic bottle and the liquid at the high temperature, wherein the reduced pressure amount of the filling body at the normal temperature is 1 kPa or more and 15 kPa or less.

Furthermore, the present invention is a method for producing a filling body, which is formed from a preform having an amorphous mouth and is filled with the high temperature liquid in a rectangular plastic bottle having heat resistance to the high temperature liquid to be filled. Where the high temperature is 81° C. or higher and 90° C. or lower, a step of heating the body of the preform, and a step of blow molding the plastic bottle from the preform using a mold, Filling the plastic bottle with the liquid at the high temperature, attaching a cap to the mouth of the plastic bottle, sterilizing the mouth of the plastic bottle and the cap by sterilization, and the plastic bottle And a step of blowing cooling air to the plastic bottle in the step of blow molding, heating the body of the preform to 115° C. or higher and 135° C. or lower, The temperature of the body of the die is 90° C. or higher and 125° C. or lower, the body die has a rough surface portion on at least a part of the surface, and all steps are performed by an in-line method. A wall portion, the wall portion includes a pressure absorbing panel, the pressure absorbing panel includes a step wall surface, an inclined surface, and a plurality of ribs extending in the horizontal direction between the step wall surfaces; The wall surface is connected to the wall portion via the inclined surface and is recessed inward, and the step wall surface is in a horizontal state in the horizontal direction from both left and right end portions of the step wall surface toward the center, and the plastic bottle The inside of the plastic bottle is filled with the high temperature liquid and then sealed, and the inside of the plastic bottle is kept curved until the pressure in the plastic bottle is changed from positive pressure to negative pressure and cooled to room temperature. It is produced as described above.

According to the present invention, there is provided a prismatic plastic bottle molded from a preform having an amorphous mouth portion and having heat resistance to a high temperature liquid to be filled, the high temperature being 81°C or higher and 90°C or lower. Then, the body portion includes a wall portion, the wall portion includes a pressure absorbing panel, and the pressure absorbing panel includes a step wall surface, an inclined surface, and a plurality of ribs extending horizontally between the step wall surfaces. The stepped wall surface is connected to the wall portion through the inclined surface and is recessed inward.The stepped wall surface is in a horizontal state in the horizontal direction from both left and right end portions of the stepped wall surface toward the center of the plastic bottle. Curved inward, sealed after being filled with a hot liquid , the pressure inside the plastic bottle changes from positive pressure to negative pressure, and the inward curve is maintained until it cools to room temperature, so inline It is possible to provide a plastic bottle that is manufactured and has heat resistance applicable to hot filling, and that is suppressed from being deformed due to a pressure change in the container during filling.

Moreover, the ribs are concave ribs, from right and left ends, according to a more profoundly that structure toward the center, is produced in-line, have applicability heat resistance to the hot filling, and within the container during the filling It is possible to provide a plastic bottle in which deformation due to pressure change is further suppressed.

Further, the pressure absorbing panel is manufactured in-line and has heat resistance applicable to hot filling, because the pressure absorbing panel is curved inward from the upper and lower ends of the pressure absorbing panel toward the center and inward of the plastic bottle. It is possible to provide a plastic bottle that has the above-mentioned property and is further suppressed from being deformed due to a pressure change in the container during filling.

Further, according to the constitution in which the surface roughness Ra of the body portion is 0.3 μm or more and 3 μm or less, it is produced in-line, has heat resistance applicable to hot filling, and changes in pressure in the container at the time of filling. It is possible to provide a plastic bottle with suppressed deformation due to good shapeability.

Further, according to the constitution that the material forming the plastic bottle is polyethylene terephthalate and the density of the body is 1.367 g/cm ³ or more and 1.380 g/cm ³ or less, it is produced in-line and applied to hot filling. It is possible to provide a plastic bottle having higher possible heat resistance and suppressing deformation due to pressure change in the container during filling.

Further, according to the constitution in which the crystallinity of the body is 25% or more and 39% or less, it has a higher heat resistance that is produced in-line and can be applied to hot filling, and the pressure in the container at the time of filling is high. It is possible to provide a plastic bottle in which deformation due to change is suppressed.

Further, the body is cut out into 10 mm×50 mm cut pieces, and the cut pieces have a tensile fracture strain at 300 mm/min of 40% or more and 68% or less at 85° C. It is possible to provide a plastic bottle that has higher heat resistance applicable to hot filling and that is suppressed from being deformed due to a pressure change in the container during filling.

In addition, since the longitudinal draw ratio from the preform to the plastic bottle is 1.8 or more and 4.0 or less, it has a higher heat resistance applicable to hot filling and can be produced inline, and a container at the time of filling. It is possible to provide a plastic bottle in which deformation due to pressure change inside is suppressed.

Further, since the transverse draw ratio from the preform to the plastic bottle is 1.8 or more and 3.0 or less, it is produced in-line, has more heat resistance applicable to hot filling, and is in a container at the time of filling. It is possible to provide a plastic bottle in which the deformation due to the pressure change is suppressed.

Further, the shoulder portion has a straight portion extending in the vertical direction from the connection end with the body portion, and the length of the straight portion is 5 mm or more and 10 mm or less. It is possible to provide a plastic bottle which has heat resistance applicable to filling and which is suppressed from being deformed due to a pressure change in the container at the time of filling with good shapeability.

Further, the bottom portion is provided with a dome projecting inward from a substantially flat plate-shaped bottom wall and ribs provided radially on the dome, and the height from the bottom wall to the central portion of the dome is 4 mm or more and 20 mm or less. According to the configuration described above, it is possible to provide a plastic bottle that is manufactured in-line, has heat resistance applicable to hot filling, and is further suppressed from being deformed due to a pressure change in the container during filling.

Furthermore, according to the present invention, a filled body comprising the above-mentioned plastic bottle and a high-temperature liquid, wherein the reduced pressure amount of the filled body at room temperature is 1 kPa or more and 15 kPa or less, it is produced in-line and hot. It is possible to provide a filling body that has heat resistance applicable to filling and that is suppressed from being deformed due to a pressure change in the container during filling.

Furthermore, according to the present invention, a method for producing a filling body in which a high temperature liquid is filled in a rectangular plastic bottle that is molded from a preform having an amorphous mouth and has heat resistance to the high temperature liquid to be filled. The high temperature is 81° C. or higher and 90° C. or lower, the step of heating the body of the preform, the step of blow molding a plastic bottle from the preform using a mold, and the high temperature of the plastic bottle Of the plastic bottle, a step of attaching a cap to the mouth of the plastic bottle, a step of sterilizing the mouth of the plastic bottle and the cap by tipping, and a step of cooling the plastic bottle, and a blow molding step. Among them, the method further comprises a step of blowing cooling air to the plastic bottle, heating the body of the preform to 115°C or higher and 135°C or lower, and setting the temperature of the mold die to 90°C or higher and 125°C or lower. , Dokin type has a rough surface on at least a part of the surface, perform all steps in-line type, plastic bottles, provided with a wall portion, the wall portion is provided with a pressure absorbing panels, pressure-absorbing panel Comprises a stepped wall surface, an inclined surface, and a plurality of ribs extending horizontally between the stepped wall surfaces. The stepped wall surface is connected to the wall portion through the inclined surface and is recessed inward, and the stepped wall surface is , At normal pressure, in the horizontal direction, from the left and right ends of the step wall toward the center, bend inward of the plastic bottle, and after being filled with a high-temperature liquid, it is sealed and the pressure inside the plastic bottle changes from positive pressure. Since it is manufactured so that it will be curved inward until it turns to negative pressure and is cooled to room temperature, it is manufactured in-line and has heat resistance applicable to hot filling, and a container at the time of filling. It is possible to provide a method for manufacturing a filling body in which deformation due to a change in internal pressure is suppressed.

It is a front view showing an example of a preform concerning this embodiment. It is a front view which showed the PET bottle as an example of the plastic bottle which concerns on this embodiment. It is a top view of the PET bottle of FIG. It is the IV-IV sectional view taken on the line of FIG. FIG. 5 is a sectional view taken along line VV of FIG. 2. It is the VI-VI sectional view taken on the line of FIG. It is a VII direction arrow line view of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. It is a bottom view of the PET bottle of FIG. It is the schematic which the manufacturing apparatus of the filling body which concerns on this embodiment was shown typically. It is a sectional view showing an example of a heating device of a preform. It is sectional drawing which showed typically the preform and the PET bottle after blow molding. It is a flow chart showing the outline of the manufacturing process of the filling object concerning this embodiment. It is the schematic which showed an example of blowing of cooling air to a PET bottle. It is the schematic which illustrated typically the relationship between the cross section in the thickness direction in the wall part of the body part of a PET bottle, and crystallinity. It is the graph which showed an example of the time-dependent change of the temperature in the inside of a PET bottle from the time of filling with a hot drink to the time of cooling. It is the schematic which showed an example of the time-dependent change of the pressure inside a PET bottle from the time of filling with a hot drink until it is cooled. 9 is a flowchart showing an outline of a manufacturing process of a filling body according to another embodiment.

Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. First, the configuration of the preform 1 (preformed body) used in the method for manufacturing a filled body according to the present embodiment will be described in detail. FIG. 1 is a front view showing an example of the preform 1 according to the present 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 the one end side of the preform 1 faces upward will be referred to as the top.

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

A screw portion 13 is provided on the outer periphery of the mouth portion 10 for attaching a lid (not shown) after the preform 1 is molded into a bottle shape by a blow molding machine (not shown). Further, the mouth portion 10 has an annular cover 14 projecting outward between the support ring 12 on the outer periphery of the mouth portion 10 and the screw portion 13. The support ring 12 projects further outward than the turnip 14. In addition, in the preform 1 used in the method for manufacturing the filling body according to the present embodiment, the mouth portion 10 is amorphous. That is, in the method for manufacturing the filling body according to the present embodiment, the step of crystallizing the mouth portion 10 can be omitted.

The shape of the mouth portion 10 does not change even after molding by the blow molding machine. Therefore, the outer diameter (corresponding to the thread root diameter D2), the inner diameter, the thread diameter D3, and the height of the mouth portion 10 of the preform 1 according to the present embodiment are, for example, standardly used in a PET bottle for beverages. The dimensions are preferably

The mouth portion 10 may have a size corresponding to the PCO (Plastic Closure Only) 1810 standard or the PCO1881 standard, for example. More specifically, the inner diameter of the mouth portion 10 is preferably 21.74 mm±0.13 mm. Further, the outer diameter of the mouth portion 10 is preferably 24.94 mm±0.13 mm. Further, the height of the mouth portion 10 is preferably 21.00 mm±0.25 mm (PCO1810 standard) or 17.00 mm±0.25 mm (PCO1881 standard). The height of the mouth 10 is the distance from the lower surface of the support ring 12 to the upper end of the mouth 10. In addition, in order to improve heat resistance, the thread root diameter D2 is preferably 24.60 mm or more and 27.20 mm or less.

The body portion 15 has a cylindrical shape and is a portion that swells so as to have the shape of a bottle during blow molding. The body part 15 has a neck part 16 connected to the mouth part 10 (the lower surface of the support ring 12 ), a body part 17 connected to the neck part 16, and a bottom part 18 connected to the body part 17.

The neck portion 16 is formed, for example, in an inverted truncated cone shape whose diameter decreases from the mouth portion 10 side toward the trunk middle portion 17 side. That is, the body diameter at the lower end of the neck 16 is smaller than the body diameter at the upper end of the neck 16 (immediately below the support ring 12). Further, the neck portion 16 may be configured such that the thickness thereof increases from the mouth portion 10 side toward the body middle portion 17 side from the viewpoint of improving 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 the wall thickness of the body middle portion 17 are substantially cylindrical and do not substantially change in the vertical direction. However, the body middle part 17 may be provided with a draft angle which is an inclination for facilitating the removal from the mold used in the production of the preform 1 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 that is curved outward. The bottom portion 18 may have a conical shape, a columnar shape with rounded corners, or any other shape. A solidified portion additionally formed at the inflow port (gate) of the molten resin when the preform 1 is manufactured by injection molding is attached to the bottom portion 18. FIG. 1 shows the form after the part is cut out.

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. Further, the diameter of the body middle portion 17 on the outer peripheral surface side is the outer diameter D1 of the body portion 15. The height H1 of the body portion 15 is preferably 50 mm or more and 90 mm or less. Further, the outer diameter D1 of the body portion 15 is preferably 16 mm or more and 25 mm or less.

Examples of the material of the preform 1 include polyolefins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and polypropylene, ethylene-vinyl alcohol copolymer, and polylactic acid made from plants as raw materials. Various plastics capable of blow molding can be used. However, it is preferable that the preform 1 contains a polyester such as polyethylene naphthalate, particularly polyethylene terephthalate as a main component. Incidentally, the above-mentioned resin, various additives, for example, a colorant, an ultraviolet absorber, a release agent, a lubricant, a nucleating agent, an antioxidant, an antistatic agent, to the extent that the quality of the molded product is not impaired. It can be blended.

As the ethylene terephthalate-based thermoplastic resin constituting Preform 1, ethylene terephthalate units occupy most of the ester repeating portion, generally 70 mol% or more, and have 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-based thermoplastic polyester, polyethylene terephthalate is particularly excellent in terms of pressure resistance, but in addition to the ethylene terephthalate unit, it is composed of a dibasic acid such as isophthalic acid or naphthalene dicarboxylic acid, and a diol such as propylene glycol. Copolymerized polyesters containing small amounts of ester units can also be used.

Polyethylene terephthalate has the highest production volume among thermoplastic synthetic resins. The polyethylene terephthalate resin has various properties such as excellent heat resistance, cold resistance, chemical resistance, and abrasion resistance. Furthermore, the polyethylene terephthalate resin has a lower proportion of petroleum in its raw material than other plastics and can be recycled. As described above, according to the configuration containing polyethylene terephthalate as a main component, a material that is produced in a large amount can be used, and its excellent various characteristics 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 those using antimony compounds.

The preform 1 is formed by injection-molding a pellet-shaped polyethylene terephthalate as a main raw material. For the injection molding, an injection molding device including a hopper dryer, a hopper, a heating cylinder, a screw, a mold, a cooler and the like is used. Pellet-shaped polyethylene terephthalate is dried, plasticized, injected, pressed, and cooled to form preform 1.

The preform 1 may be composed of multiple layers. At least one of the multiple layers may have a barrier layer or an oxygen absorbing layer. For the barrier layer, for example, polyamide or ethylene-vinyl alcohol copolymer is used. For the oxygen absorption 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. An oxygen permeation preventing function can be imparted by such a barrier layer or oxygen absorbing layer.

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

Next, the configuration of the plastic bottle formed in the method for manufacturing a filling body according to this embodiment will be described in detail. FIG. 2 is a front view showing a PET bottle 2 as an example of the plastic bottle according to the present embodiment. That is, the material forming the plastic bottle is polyethylene terephthalate. FIG. 3 is a plan view of the PET bottle 2 of FIG. The PET bottle 2 illustrated in FIGS. 2 and 3 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 body portion 30, and a bottom portion 40. As described above, the structure of the mouth 10 of the PET bottle 2 is the same as the structure of the mouth 10 of the preform 1. The mouth 10 of the PET bottle 2 is amorphous.

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 thereof is continuous with the body portion 30. The shoulder portion 20 has a substantially quadrangular pyramid shape whose diameter increases from the upper side to the lower side.

The shoulder portion 20 preferably has a straight portion 21 that extends in the vertical direction from a connection end with the body portion 30. The lower end of the shoulder portion 20 is likely to be locally thinned during molding, and a dent caused by molding shrinkage, that is, a so-called sink mark is likely to occur. However, the shape of the shoulder portion 20 can be improved by the configuration having the straight portion 21 that extends in the vertical direction from the connection end with the body portion 30. The length L of the linear portion 21 is preferably 5 mm or more and 10 mm or less, and more preferably 2 mm or more and 10 mm or less.

The body portion 30 has four wall portions 31 having the same shape connected to each other in the circumferential (horizontal) direction, and has a substantially square tube shape as a whole. Each of the walls 31 comprises a pressure absorbing panel 32.

Here, the details of the pressure absorption panel 32 will be described. 4 is a sectional view taken along line IV-IV of FIG. 2, FIG. 5 is a sectional view taken along line VV of FIG. 2, and FIG. 6 is a sectional view taken along line VI-VI of FIG. The upper side in FIG. 4 and the right side in FIG. 5 show the inside of the PET bottle 2. The wall portion 31 includes a pressure absorbing panel 32 that is recessed inward by one step. The pressure absorbing panel 32 has a function of absorbing a change in pressure inside the PET bottle 2, particularly a change in decompression, and maintaining the strength of the PET bottle 2, particularly the side wall strength that is the strength to withstand the horizontal load of the body portion 30. Have.

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

As shown in FIG. 5, the depth s from the surface of the wall portion 31 to the step wall surface 33 recessed inward by one step is 1.0 mm or more and 3.5 mm or less, preferably from the surface of the surrounding wall portion 31. Is 2.5 mm. If the depth s is too small, the pressure absorption panel 32 will not reverse and return when increasing the pressure, while if the depth s is too large, the PET bottle 2 will be improperly shaped or whitened due to overstretching during molding. Is likely to occur.

The step wall surface 33 constituting the pressure absorbing panel 32 is curved inward of the PET bottle 2 from both ends of the step wall surface 33 toward the center, is sealed after being filled with a high temperature liquid, and is cooled to room temperature. , Inwardly curved. More specifically, as illustrated in FIG. 4, the step wall surface 33 is curved inward from the left and right ends toward the center of the PET bottle 2 in the horizontal direction. On the other hand, as illustrated in FIG. 5, even in the vertical direction, the step wall 33 may be curved inward from the upper and lower ends toward the center of the PET bottle 2. With such a configuration, even when the PET bottle 2 has a positive pressure, the step wall surface 33 of the pressure absorbing panel 32 does not deform until it becomes vertical, and thereafter, when the PET bottle 2 has a negative pressure, the PET bottle 2 moves inward. It can be made to exhibit a behavior of bending.

The bending amount d1 at the center of the step wall surface 33 from the left and right ends of the step wall surface 33 or the line connecting the upper and lower ends is 0.5 mm or more and 3 mm or less, while absorbing the pressure change inside the PET bottle 2. It is preferable from the viewpoint of maintaining strength. When the bending amount d1 is less than 0.5 mm, the positive pressure easily causes the PET bottle 2 to protrude to the outside, and as a result, the pressure absorbing effect is difficult to be exerted. On the other hand, when the amount of curvature d1 is larger than 3 mm, it becomes a bending point when the pressure is reduced, or the internal volume decreases.

The ratio d1/w1 of the bending amount d1 at the center of the step wall surface 33 to the left and right widths w1 of the step wall surface 33 is preferably 0.01 or more and 0.20 or less. When the ratio d1/w1 between the width w1 and the amount of curvature d1 is smaller than 0.01, the positive pressure tends to cause the PET bottle 2 to protrude to the outside, and as a result, the effect of pressure absorption becomes difficult to be exerted. On the other hand, if the ratio d1/w1 of the width w1 and the amount of curvature d1 is larger than 0.20, it may become a bending point when the pressure is reduced or the internal capacity may decrease.

If the surface of the step wall surface 33 does not have irregularities, it is easy for the positive pressure to project to the outside of the PET bottle 2. Therefore, the rigidity of the step wall surface 33 is increased by adopting the configuration having the concave rib 34. However, if the number of the concave ribs 34 is too large, the pressure absorbing panel 32 cannot be deformed in and out of the PET bottle 2, and the pressure absorbing function is lost. Therefore, the number and size of the concave ribs 34 are designed to be appropriate. In the example of FIG. 2 and the like, nine concave ribs 34 are arranged.

Each concave rib 34 extends continuously from the left end to the right end of the step wall surface 33. The concave ribs 34 are formed at equal intervals over the entire area in the vertical direction from the upper end to the lower end of the step wall surface 33. The step wall surface 33 is most susceptible to the pressure change of the PET bottle 2 at its central portion. Therefore, the region in which the concave rib 34 is formed is not limited to the entire region in the vertical direction of the pressure absorbing panel 32, but may be a part of the pressure absorbing panel 32, for example, only the central portion in the vertical direction of the pressure absorbing panel 32. ..

It is preferable that at least four concave ribs 34 and not more than 12 concave ribs 34 are arranged in the pressure absorbing panel 32. When the number of the concave ribs 34 is within this range, the pressure reducing absorption function can be sufficiently exerted, and further, the stress applied to the PET bottle 2 can be dispersed and the effect of reinforcing the PET bottle 2 can be sufficiently obtained. To be

Although the concave rib 34 may be formed to have a constant depth, it is preferably formed so as to become deeper from the left and right ends toward the center. With the configuration in which the concave rib 34 is deepest at the center, it is possible to prevent the positive ribs from easily protruding to the outside of the PET bottle 2.

The depth d2 at the center of the concave rib 34 is preferably 0.5 mm or more and 3 mm or less from the viewpoint of maintaining the strength while absorbing the pressure change inside the PET bottle 2. When the depth d2 is smaller than 0.5 mm, the positive pressure makes it easier for the PET bottle 2 to protrude to the outside, and as a result, the pressure absorbing effect is less likely to be exhibited. On the other hand, if the depth d2 is larger than 3 mm, it may become a bending point when the pressure is reduced, or the internal capacity may decrease. The depths d2 at the center of the plurality of concave ribs 34 do not have to have the same value, but may have different values.

The PET bottle 2 is slightly permeable to oxygen. Then, when the PET bottle 2 is stored for a long period of time, some contents are oxidized, and the inside of the PET bottle 2 is depressurized. In addition, the internal pressure of the PET bottle 2 also changes due to the temperature difference between when the contents are filled and when the contents are stored. The PET bottle 2 having a reduced pressure inside is pulled inward and deformed. At this time, the pressure absorbing panel 32 is easily deformed inward by extending the uneven surface of the step wall surface 33 and the concave rib 34. When the inside of the PET bottle 2 is depressurized, the pressure absorption panel 32 is recessed inward of the PET bottle 2 to prevent deformation of the entire PET bottle 2. That is, the pressure absorbing panel 32 is configured so as not to protrude outside the wall portion 31 of the PET bottle 2 but to be recessed inside to some extent.

The pressure absorbing panel 32 plays a role of preventing the deformation of the entire PET bottle 2 even when the pressure inside the PET bottle 2 is increased. The pressure absorbing panel 32 having such a configuration can prevent the wall of the PET bottle 2 from being pressed inward and the contents from being pushed out of the mouth 10 and spilling when the PET bottle 2 is opened. .. The pressure absorbing panel 32 can enhance the rigidity of the body portion 30.

The wall portion 31 of the PET bottle 2 is a portion to which a label is attached. The label is attached, for example, by a shrink label that shrinks by applying hot air to a heat-shrinkable film such as a tubular polystyrene (PS: PolyStyrene) or polyethylene terephthalate (PET: PolyEthylene Terephthalate) covered with the PET bottle 2. .. Since the tubular heat-shrinkable film has a predetermined size, if the wall portion 31 is swollen, the heat-shrinkable film may be clogged or may not enter.

However, by providing the pressure absorbing panel 32, the protrusion of the wall portion 31 to the outside is prevented, the label is smoothly attached, and the productivity can be improved. Furthermore, by providing the pressure absorbing 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 prevent the product value from decreasing.

As described above, the pressure absorbing panel 32 is preferably provided with a plurality of concave ribs 34 extending in the horizontal direction from the viewpoint that the pressure is dispersed, but the concave or convex shape extending in any direction is not shown. It may have ribs.

Furthermore, in the case of a convex rib, it is preferable that the PET bottle 2 is designed so that the convex portion of the rib does not project 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 a positive pressure, the convex rib is not visible when the PET bottle 2 is viewed from right next to the protruding direction of the convex rib. The rib thus configured does not affect the size of the PET bottle 2 facing each other. Therefore, the PET bottle 2 according to the present embodiment has excellent loading efficiency for packaging in a corrugated board or the like. Furthermore, the PET bottle 2 according to this embodiment also has an effect of not affecting the mounting of the shrink label.

7 is a view taken in the direction of arrow VII in FIG. 3, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is a sectional view taken along line IX-IX in FIG. The PET bottle 2 preferably has an annular lateral groove 35 that crosses the wall portion 31 above and below the pressure absorbing panel 32 (see FIGS. 2 and 7 ). The lateral groove 35 has a function of improving sidewall strength. The lateral groove 35 can also be used for alignment when mounting the label. On the other hand, the PET bottle 2 has better moldability when it does not have the lateral groove 35.

On the other hand, if there is even one horizontal reinforcing rib such as the lateral groove 35, it serves as a cushion, and the displacement becomes large with respect to the vertical load, although it does not buckle. Then, the buckling strength, which is the strength to withstand the load in the vertical direction in the range where the displacement is small, decreases. Therefore, when the horizontal groove 35 is formed, the PET bottle 2 preferably has a vertical groove 36 extending in the vertical direction between the adjacent wall portions 31 (see FIGS. 2 and 7 ). The vertical groove 36 improves the buckling strength of the body portion 30. At least one vertical groove 36 is formed at the same location. Depending on the case, two to three vertical grooves 36 may be formed at the same location. However, if the number of the vertical grooves 36 is too large, the number of irregularities increases and the shapeability deteriorates.

In the case where the PET bottle 2 has the lateral groove 35, it is preferable from the viewpoint of shapeability that the linear portion 21 of the shoulder portion 20 described above is formed as long as possible.

8 is a sectional view taken along the line VIII-VIII of FIG. 7, and FIG. 9 is a sectional view taken along the line IX-IX of FIG. 7. In all of these, the horizontal cut surface of the PET bottle 2 is shown. Therefore, the vertical groove 36 is shown in the width direction, and the horizontal groove 35 is shown in the extending (circulating) direction.

The vertical groove 36 has a width w2 and a depth d3. The width w2 and the depth d3 are based on the location of the vertical groove 36 protruding to the outermost side of the PET bottle 2. Then, the vertical groove 36 extends in the vertical direction of the PET bottle 2 at a uniform depth d3 except for the inclined portions at the upper end and the lower end.

The width w2 of the vertical groove 36 is preferably 1 mm or more and 8 mm or less. If the width w2 of the vertical groove 36 is smaller than 1 mm, the effect is lost and the shapeability is deteriorated. On the other hand, if the width w2 of the vertical groove 36 is larger than 8 mm, the wall portion 31 becomes narrow, which is not desirable.

The depth d3 of the vertical groove 36 is preferably 0.5 mm or more and 5 mm or less. If the depth d3 of the vertical groove 36 is smaller than 0.5 mm, the effect is lost. On the other hand, if the depth d3 of the vertical groove 36 is larger than 5 mm, the shapeability is likely to deteriorate.

As shown in FIG. 9, the lateral groove 35 has a depth d4 near the intersection with the vertical groove 36. The depth d4 of the lateral groove 35 is smaller than the depth d3 of the vertical groove 36, and the ratio d3/d4 of the depth d3 to the depth d4 is 1.1 to 1.5. It is preferable from the viewpoint of shapeability. When the ratio d3/d4 is smaller than 1.1, the PET bottle 2 is likely to be deformed when subjected to a vertical load. On the other hand, if the ratio d3/d4 is larger than 1.5, the shapeability tends to deteriorate.

The lateral groove 35 has a depth d5 near the horizontal center of the wall portion 31. The depth d5 of the lateral groove 35 is preferably 0.5 mm or more and 3 mm or less. The effect is lost when the depth d5 of the lateral groove 35 is smaller than 0.5 mm. On the other hand, if the depth d5 of the lateral groove 35 is larger than 3 mm, the shapeability tends to deteriorate.

The lowermost region of the body portion 30 is the heel portion 37. The heel portion 37 has a long distance from the bottom portion 18 (see FIG. 1) of the preform 1 when the PET bottle 2 is molded from the preform 1, and the stretching ratio increases accordingly, so that the heel portion 37 becomes thin and sometimes It is a place that is easily whitened.

FIG. 10 is a bottom view of the PET bottle 2 of FIG. The upper portion of the bottom portion 40 is continuous with the lower portion of the body portion 30. The bottom portion 40 has a bottom wall 41, a dome 42, and a rib 43. The substantially flat plate-shaped bottom wall 41 extends in a direction perpendicular to the body portion 30 and serves as a grounding surface of the PET bottle 2. The dome 42 is configured to protrude from the bottom wall 41 to the inside (upper side) of the PET bottle 2 on the inner circumference of the bottom wall 41, and has a function of improving the strength of the bottom portion 40. A plurality of ribs 43 are radially provided on the dome 42 in a bottom view and have a function of reinforcing the dome 42.

Since the bottom portion 40 has the dome 42 and the ribs 43, the bottom portion 40 is configured so as not to easily project outward even if positive pressure is applied in a state where it is easily deformed by heat, and it is possible to deform by bending to positive pressure. It can be prevented. However, the height h from the bottom wall 41 to the central portion 42c of the dome 42 shown in FIG. 2 is designed to be maintained higher than the ground plane of the PET bottle 2 even if the dome 42 is deformed by heat. Just go. More specifically, the height h from the bottom wall 41 to the central portion 42c of the dome 42 is preferably 4 mm or more and 20 mm or less. Even if the height h falls within this range, even if it is deformed, it can be prevented from protruding outward from the bottom wall 41, and rattling and falling of the PET bottle 2 can be prevented. Therefore, the filler can be produced in-line with a good appearance, and it is possible to prevent the transportability of the filler and the stacking efficiency from being lowered.

Note that the configuration of the bottom portion 40 is not limited to the example shown in FIG. 2 and the like, and it is sufficient that the bottom portion 40 is configured so as not to easily project outward even if positive pressure is applied in a state where it is easily deformed by heat.

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 H2 of the body portion 30. Further, the distance between the pair of opposite sides of the body portion 30 is the outer diameter D4 of the body portion 30 of the PET bottle 2.

The shape of the PET bottle 2 especially below the support ring 12 is not limited to the example shown in FIG. 2 and the like, but is formed by blow molding the preform 1 and is not excessively deformed by heat and positive pressure. Any shape may be used as long as it is a square bottle that can absorb and maintain its shape. Further, the shapes of the pressure absorbing panel 32, the lateral grooves 35, and the vertical grooves 36 formed on the body portion 30 can be freely designed within a range in which their effects sufficiently function.

The PET bottle 2 according to the present 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 body portion 30 may be 30 mm or more and 80 mm or less. Furthermore, the mass of the PET bottle 2 may be, for example, 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 as described above, it is possible to provide the PET bottle 2 which is manufactured in-line, has heat resistance applicable to hot filling, and is suppressed from being deformed due to a pressure change in the container during filling.

In addition, the PET bottle 2 having the mouth portion 10, the shoulder portion 20, the body 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 filling body according to the present embodiment is configured by the cap that seals the bottle 2.

Next, the filling body manufacturing apparatus according to the present embodiment will be described in detail. FIG. 11 is a schematic diagram schematically showing the manufacturing apparatus 100 for the filling body 70 according to the present embodiment. The manufacturing apparatus 100 for the filling body 70 according to the present embodiment includes a heating unit that heats the body 15 of the preform 1, a molding unit that blow-molds the PET bottle 2 from the preform 1 using a mold, and a PET bottle. 2, a filling part for filling a high temperature liquid, a mounting part for mounting a cap on the mouth 10 of the PET bottle 2, a tip sterilizer for tip sterilizing the mouth 10 and the cap of the PET bottle 2, and a PET bottle 2 And a cooling unit for cooling. In the apparatus 100 for manufacturing the filling body 70 according to the present embodiment, the apparatus for molding the PET bottle 2 from the preform 1 which is the preform, the apparatus for filling the PET bottle 2 with the high temperature liquid, and the like are all in-line systems. It is characterized by being composed of.

The in-line method here may be a method in which a molding section and a filling section are connected (synchronized), or a separate method in which the PET bottle 2 is conveyed by air with the molding section and the filling section separated from each other. good. Furthermore, in the apparatus 100 for manufacturing the filling body 70 according to the present embodiment, an injection molding apparatus or the like for forming the preform 1 may be included in various apparatuses configured by the inline method.

The bottle molding machine 110 has a heating device 111 as a heating unit and a biaxial stretching blow molding device 112 as a molding unit. When the preform 1 is molded into a bottle shape, first, the preform 1 is heated.

FIG. 12 is a sectional view showing an example of the heating device 111 for the preform 1. Note that FIG. 12 shows a cross section of the preform 1 in a direction perpendicular to the conveying direction.

The heating device 111 includes a transfer device 113 and a heater 114. The transport device 113 is configured to transport while rotating the preform 1 about its axis 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. Further, the heating device 111 prevents the heat from the heater 114 from being reflected to the body portion 15 of the preform 1 and the heat from the heater 114 to the outside of the heating device 111. The shield member 116 and the like may be provided. In the heating device 111 of FIG. 12, the preform 1 is conveyed and heated with the mouth 10 facing downward.

FIG. 13 is a cross-sectional view schematically showing the preform 1 and the PET bottle 2 after blow molding. The biaxial stretching blow molding device 112 is configured by a mold 117, a stretching rod 118, an air supply device (not shown), and a control device that controls these. Note that, although the biaxially stretched blow molding apparatus 112 of the downward blow molding method is illustrated in FIG. 13, an upward blow molding method in which the material is less susceptible to the influence of gravity may be used.

The mold 117 has a shape corresponding to the PET bottle 2 to be formed, and is, for example, a body mold 117a corresponding to the body portion 30 and is divided in half, and a bottom die 117b corresponding to the bottom portion 40. Have. The surface temperature of the body die 117a is controlled to, for example, 90°C or higher and 125°C or lower, preferably 90°C or higher and 120°C or lower, and more preferably 90°C or higher and 115°C or lower. On the other hand, the temperature of the surface of the bottom die 117b is controlled to be 5°C or higher and 30°C or lower. The surface temperature of the barrel die 117a exceeds the glass transition point (Tg) of polyethylene terephthalate.

By setting the temperature of the surface of the die 117 to 120° C. or lower, for example, as the material of the die 117, for example, stainless steel quenching and tempering steel having a large weight and a heavy work load in handling, and a steel material for a die are used. Instead, aluminum can be used. By using aluminum, the mold 117 can be easily processed, the degree of freedom in design can be increased, and the manufacturing cost can be suppressed. Further, since the weight of the mold 117 is reduced, the mold replacement work becomes easy.

The body metal mold 117a preferably has at least a part of the surface, more specifically, a rough surface portion 117R that has been subjected to graining (rough surface processing) on a portion that comes into contact with 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 sandblasting or polishing treatment, or a scientific treatment method such as etching. The heel portion 37 is a portion that is generally difficult to shape. This becomes particularly remarkable at the heating temperature of the preform 1 set in the manufacturing apparatus 100 for the filling body 70 according to the present embodiment and the temperature of the surface of the barrel metal mold 117a. However, since the rough surface portion 117R is provided at the portion in contact with the heel portion 37, the mold release is improved and local excessive shrinkage is prevented from occurring, and as a result, the shapeability of the PET bottle 2 is improved. ..

The stretching rod 118 is configured so that it can expand and contract inside the mold 117. The stretching rod 118 is configured to stretch the body portion 15 of the preform 1 having the mouth portion 10 attached to the mold 117 in the longitudinal (axial) direction. The air P whose pressure and temperature have been adjusted is blown out from the air supply device. 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, and 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 lateral (radial) 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 also improves the heat resistance.

As shown in FIG. 11, the hot filling machine 120 has a filler 121 as a filling portion and a capper 122 as a mounting portion. The filler 121 injects the contents of the high temperature liquid that has been sterilized by heating, 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. Is configured. The capper 122 as a 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 sealed by the attached cap 60 to form the filling body 70.

The tipping sterilizer 130 as the tipping sterilization unit tilts the filling body 70 at 90 degrees or more for a predetermined time, for example, for 30 seconds, and the inside of the filling body 70, particularly the mouth of the PET bottle 2 is heated by the heat of the hot beverage 50. It is configured to sterilize the portion 10 and the cap 60. The sterilization time is appropriately designed according to the type and temperature of the beverage 50.

The past riser 140 as a cooling unit has, for example, a constant temperature bath of 4 baths for storing water having a plurality of temperatures as a heat exchange liquid, and a jet port such as a nozzle. The pasterizer 140 sprays high-temperature water, for example, 70° C. water to heat and sterilize the filling body 70 from the outside, and then gradually lowers the temperature of the sprayed water. At the final stage, low-temperature water, for example, 30° C. The filler 70 (PET bottle 2) is cooled by spraying water. The cooling by the pasterizer 140 has an effect of preventing the flavor of the beverage 50 filled in the filling body 70 from changing. The temperature of the liquid contained in the first tank of the pasterizer 140 is preferably 70° C. or lower. By rapidly cooling the filling body 70 at 70° C. or lower, damage to the body portion 30 of the PET bottle 2 due to heat can be reduced.

The manufacturing apparatus 100 for the filling body 70 has a labeler, a caser 150, a printing device, an inspection device, and the like as a subsequent stage of these devices. The labeler attaches a label to the filling body 70 (PET bottle 2). The caser is one in which a predetermined number, for example, 24 pieces, of the filling bodies 70 are packed in a cardboard box. The filling body 70 according to the present embodiment is manufactured by using the above-mentioned devices and the like.

Next, a method for manufacturing the filling body 70 according to this embodiment will be described in detail. FIG. 14 is a flowchart showing an outline of the manufacturing process of the filling body 70 according to the present embodiment. In the present embodiment, at least the step of heating the body 15 of the preform 1, the step of blow molding the PET bottle 2 from the preform 1 using the mold 117, and filling the PET bottle 2 with the hot beverage 50. The process includes a step, a step of mounting the cap 60 on the mouth 10 of the PET bottle 2, a step of sterilizing the mouth 10 of the PET bottle 2 and the cap 60 by overturning, and a step of cooling the PET bottle 2. The present embodiment is characterized in that all the steps such as molding the PET bottle 2 from the preform 1 and filling the PET bottle 2 with the hot beverage 50 are performed by an in-line method. Hereinafter, each step will be described in more detail.

First, the preform 1 is supplied to the bottle molding machine 110 (step S1). As described above, in the manufacturing apparatus 100 for the filling body 70 according to the present embodiment, an injection molding apparatus, a compression molding apparatus, a compression injection molding apparatus or the like that forms the preform 1 may be configured by an in-line method. good. Then, in this case, the preform 1 supplied to the bottle molding machine 110 is formed in the injection molding device by an in-line method. Then, the preform 1 is supplied to the bottle molding machine 110 by the cold parison method, the hot parison method, and the in-line method. In the method for manufacturing the filling body 70 according to this embodiment, the preform 1 having the amorphous mouth portion 10 is used. The supplied preforms 1 are aligned and then transported.

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

When the temperature of the preform 1 to be heated is lower than 115° C., the heat resistance is insufficient, and the PET bottle 2 molded after that cannot support hot filling for filling hot contents. , Transformed into distorted. On the other hand, when the temperature of the heated preform 1 exceeds 135° C., the preform 1 before bottle molding is excessively crystallized and blow molding cannot be performed. In this respect, if the temperature of the preform 1 to be heated is 135° C. or less, crystallization will proceed to some extent, but blow molding will be possible.

Next, blow molding of the PET bottle 2 by stretching the preform 1 is performed (step S3). The heated preform 1 is mounted on the mold 117 of the biaxial stretching blow molding device 112. In the method for manufacturing the filling body 70 according to the present embodiment, the temperature of the surface 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 that By setting the temperature in this range, the outer surface of the PET bottle 2, particularly the body portion 30, is crystallized, and the structure has heat resistance. Therefore, in a later step, the PET bottle 2 that can be filled with the hot beverage 50 can be manufactured. When the surface temperature of the body metal mold 117a is lower than 90° C., the heat resistance becomes low. On the other hand, when the surface temperature of the body metal mold 117a exceeds 125° C., the PET bottle 2 has the body metal mold 117a. When it comes into contact with, the initial contraction becomes large and deformation, that is, sink marks easily occur.

Here, in the present embodiment, the effect is realized when the temperature of the preform 1 to be heated and the temperature of the surface of the metal mold 117a both exceed a certain level. Further, the temperature of the body portion 15 of the preform 1 is more preferably higher than the temperature of the surface of the body die 117a. When the temperature of the body portion 15 is higher than the temperature of the surface of the body die 117a, the above-mentioned initial contraction is hard to occur.

First, the body portion 15 of the preform 1 mounted on the mold 117 is stretched in the longitudinal direction by the stretching rod 118. At this time, the longitudinal draw ratio from the preform 1 to the PET bottle 2 is preferably 1.8 or more and 4.0 or less. Here, the longitudinal draw ratio means the height H2 of the body portion 30 of the PET bottle 2 with respect to the height H1 of the body portion 15 of the preform 1 (see FIGS. 1 and 13) (see FIGS. 2 and 13). Ratio H2/H1. The molecules of the preform 1 having an amorphous structure, which is an aggregate of an amorphous part and a crystal part, undergoes oriented crystallization by stretching, and as a result, the strength, rigidity, and heat resistance of the PET bottle 2 are increased. Therefore, in a later step, the PET bottle 2 that can be filled with the hot beverage 50 can be manufactured. When the longitudinal stretching ratio is less than 1.8, the orientation of the molecules of the preform 1 does not improve, while when the longitudinal stretching ratio exceeds 4.0, the PET bottle 2 becomes difficult to mold.

Furthermore, the air P of which pressure and temperature are adjusted is blown out from the air supply device and is supplied into the preform 1. First, the body portion 15 of the preform 1 is stretched laterally by the low-pressure air P1 of, for example, 5 bar or more and 20 bar or less supplied along with the longitudinal stretching of the preform 1 (pre-blowing). ) Will be done. After that, the body portion 15 of the preform 1 is laterally stretched by the high-pressure air P2 of, for example, 20 bar or more and 38 bar or less in about 0.5 to 2.5 seconds until it hits the body metal mold 117a.

At this time, the transverse draw ratio from the preform 1 to the PET bottle 2 is preferably 1.8 or more and 3.0 or less. Here, the transverse stretching ratio means the outer diameter D4 of the body portion 30 of the PET bottle 2 with respect to the outer diameter D1 of the body portion 15 of the preform 1 (see FIGS. 1 and 13) (see FIGS. 2 and 13). The ratio is D4/D1. The molecules of the preform 1 are similarly oriented and crystallized by stretching in the transverse direction, and as a result, the strength, rigidity, and heat resistance of the PET bottle 2 are increased. Therefore, in a later step, the PET bottle 2 that can be filled with the hot beverage 50 can be manufactured. When the transverse stretching ratio is less than 1.8, the orientation of the molecules of the preform 1 does not improve, while when the transverse stretching 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 excessively crystallized and becoming difficult to stretch, it is determined in advance from when the preform 1 is attached to the mold 117 until it is stretched to the shape of the PET bottle 2. Controlled to fit in time.

In the method for manufacturing the filler 70 according to the present embodiment, cooling air may be further blown onto the PET bottle 2 during the blow molding process (step S4). FIG. 15 is a schematic view showing an example of blowing the cooling air C1 onto the PET bottle 2.

The biaxially stretch blow molded PET bottle 2 sticks to the mold 117 of the biaxially stretch blow molding device 112. Then, the stretching rod 118 is arranged inside the mold 117 and the PET bottle 2. The stretching rod 118 is provided with a cooling air blowing section 119. The cooling air blowing section 119 communicates with the air supply device and is configured to blow out high-pressure cooling air C1 of which pressure and temperature are adjusted. By providing the cooling air blowing section 119, it is possible to improve the deformation caused by the initial shrinkage 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 of the high pressure air P2. More specifically, the blowing time of the cooling air C1 is 0.1 second to 1.5 seconds, and 1% to 90%, and more preferably 60% to 80% of the time of the high pressure air P2. It is preferable.

Vent holes are formed in the stretching rod 118 in the diameter (lateral) direction, and the cooling air C1 is blown in a direction substantially perpendicular to the inner surface of the body portion 30 of the PET bottle 2. The body portion 30 of the PET bottle 2 starts to contract immediately when it contacts the body die 117a. When the cooling air C1 is blown there, the body portion 30 is pressed in the direction of the body die 117a to suppress its deformation, and heat resistance is imparted to the body portion 30. Therefore, the body portion 30 of the PET bottle 2 that has been blow molded and is in a high temperature state is further promoted to be crystallized by being blown 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 occurs in the body portion 30 and strain is likely to occur, while when the temperature of the cooling air C1 exceeds 30° C., the body portion 30 Becomes difficult to cool and its heat resistance decreases.

As another method, the high pressure air P2 blown out from the stretching rod 118 may be switched to the cooling air C1 stepwise. This method also promotes crystallization of the body portion 30 of the PET bottle 2. It is advisable to gradually increase the proportion of the cooling air C1 in the step of blowing the high-pressure air P2 in the blow molding, for example, at a time of 1% to 90%, more preferably 60% to 80% from the end stage. If the time is too short, the effect of this method is hard to appear, and if the time is too long, crystallization of the body portion 30 is hard to be promoted.

In addition, it is preferable to blow the cooling air C1 also on the outer surface side of the body portion 30 of the PET bottle 2. By doing so, crystallization is promoted also 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 portion 30 after the mold 117 is opened, or may be sprayed until the next step.

In this way, by blowing the cooling air C1 onto the body portion 30 of the PET bottle 2, heat resistance can be imparted to the body portion 30 while effectively suppressing the shrinkage of the body portion 30, and further, the body portion 30. The surface temperature of the PET bottle 2 can be quickly lowered to reduce the speed required for producing the PET bottle 2. Further, when the cooling air C1 is blown onto the body portion 30 of the PET bottle 2, contraction of the body portion 30 can be effectively suppressed, so that the surface temperature of the body die 117a is set to, for example, 125° C. Can be set higher. Therefore, by blowing the cooling air C1, the crystallization can be further promoted and the PET bottle 2 having heat resistance at a higher temperature can be manufactured.

Here, FIG. 16 is a schematic view schematically illustrating the relationship between the crystallinity and the cross section in the thickness direction of the wall portion 31 of the body portion 30 of the PET bottle 2. Here, the crystallinity is defined as the crystal region portion with respect to the sum of the crystal region portion and the amorphous region portion. 16, the outside 31o of the wall portion 31 is shown on the left side, the inside 31i of the wall portion 31 is shown on the right side, and the inside 31m of the wall portion 31 is shown between them.

The crystallinity of the outside 31o of the wall 31 is increased by the contact of the body mold 117a. On the other hand, the crystallinity of the inside 31i of the wall 31 is increased by being rapidly cooled. The hot beverage 50 filled in the PET bottle 2 comes into contact with the inside 31 i of the wall 31. Therefore, it is important to increase the crystallinity of the inside 31i of the wall 31.

In FIG. 16, the crystallinity of the body 30 is a distribution of the outer 31o of the wall 31>the inner 31i of the wall 31>the inner 31m of the wall 31 as shown by the crystallinity distribution curve c1. preferable. Furthermore, the crystallinity of the body portion 30 is more preferably a distribution of outside 31o of the wall 31=inside 31i of the wall 31>inside 31m of the wall 31 as shown by the crystallinity distribution curve c2. preferable. In the present embodiment, the PET bottles 2 are produced in-line so as to have such a distribution, whereby the hot-filled filling body 70 is produced in-line.

The crystallinity of the body portion 30 of the PET bottle 2 is preferably 25% or more and 39% or less. When the crystallinity is in this range, the PET bottle 2 having heat resistance can be molded from the preform 1 with good shapeability. The crystallinity of the body portion 30 of the PET bottle 2 can be derived from the density. In addition, the crystallinity of the body portion 30 of the PET bottle 2 can be evaluated by Raman spectroscopic analysis.

The density of the body portion 30 of the PET bottle 2 manufactured by the method for manufacturing the filling body 70 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 portion 30 of the PET bottle 2 can be measured by a specific gravity method, for example, a density gradient tube method, using a cut piece obtained by cutting a part of the body portion 30 in a 1 cm square, for example. By measuring the density of the body portion 30 of the PET bottle 2 in the filling body 70 manufactured by the manufacturing apparatus 100 configured by the in-line method, it is determined whether or not the manufacturing method of the filling body 70 according to the present embodiment is used. Can be determined.

Further, the tensile breaking strain of the body portion 30 of the PET bottle 2 manufactured by the method for manufacturing the filling body 70 according to this embodiment is 40% or more and 68% or less.

As a method of measuring the tensile fracture strain of the body portion 30 of the PET bottle 2, a cut piece obtained by cutting a part of the body portion 30 into, for example, a short side of 10 mm and a long side of 50 mm is used as a sample. One is fixed and then pulled at 85 mm at 300 mm/min in the long side direction. Then, the tensile breaking strain of the body portion 30 of the PET bottle 2 can be examined by measuring the percentage of pulling when breaking. Whether the method for manufacturing the filling body 70 according to the present embodiment is used by measuring the tensile fracture strain of the body portion 30 of the PET bottle 2 in the filling body 70 manufactured by the manufacturing apparatus 100 configured by the in-line method. Can be determined. In addition, 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 separates from the mold 117. Since the method for manufacturing the filling body 70 according to the present embodiment is an in-line method, the blow molding time is shortened as much as possible, and the PET bottle 2 is likely to contract. However, since the rough surface portion 117R of the body die 117a is grained, the rough surface portion 117R and the heel portion 37 do not come into contact with each other at a solid surface but at a point, and the heel portion 37 contracts inward. Sinks are less likely to occur without waviness or waviness. Therefore, the shapeability of the PET bottle 2 can be improved. Further, in the method for manufacturing the filling body 70 according to the present embodiment, the manufacturing time can be shortened, the manufacturing efficiency can be improved, and the manufacturing cost can be reduced, as compared with the heat resistant bottle.

The surface roughness (Ra) of the heel portion 37 of the PET bottle 2 manufactured by the method for manufacturing the filling body 70 according to the present embodiment is 0.3 μm or more and 3 μm or less. With such a surface roughness, it is possible to maintain the feature 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. A method for measuring the arithmetic average roughness Ra can be examined by image analysis of three-dimensional data obtained by a laser microscope. A method for manufacturing the filling body 70 according to the present embodiment by measuring the surface roughness of the body portion 30, particularly the heel portion 37, of the PET bottle 2 in the filling body 70 manufactured by the manufacturing apparatus 100 configured by the in-line method. Can be determined.

Next, as shown in FIG. 14, the PET bottle 2 is supplied to the hot filling machine 120 (step S5). Since the manufacturing apparatus 100 for the filling body 70 according to the present embodiment is configured by the in-line method, the molded PET bottle 2 is promptly supplied to the hot filling machine 120. The supplied PET bottles 2 are sequentially transferred by grippers attached to the outer peripheral portions of a plurality of rotating disc-shaped transfer wheels, for example, and are conveyed to the filler 121. It is preferable that the time after the PET bottle 2 is molded and before it is supplied to the hot filling machine 120 is within 10 seconds. As described above, since the method for manufacturing the filling body 70 according to the present embodiment is the in-line method, the PET bottle 2 is used for filling the beverage 50 in a state where the heat resistance of the PET bottle 2 is less likely to decrease.

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

Then, the PET bottle 2 is filled with the beverage 50 in the filler 121 of the hot filling machine 120 (step S7). The filler 121 injects the contents of the high temperature liquid that has been sterilized by heating, 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 transported 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 that obtained when the temperature of the metal mold 117a widely used for hot filling is 160° C. or higher. .. However, the PET bottle 2 has sufficient heat resistance to be filled with the hot beverage 50 in the temperature range described above, for example, 71° C. or higher and 95° C. or lower, more preferably 81° C. or higher and 90° C. or lower. Is made. Then, in the method for manufacturing the filling body 70 according to the present embodiment, a method is used in which the beverage 50 is filled immediately after the PET bottle 2 is molded and when the most heat resistance is maintained. Therefore, according to the method for manufacturing the filling body 70 according to the present embodiment, the PET bottle 2 can be filled with the hot beverage 50 without any problem.

As described above, the PET bottle 2 can be filled with the hot beverage 50. Therefore, for example, the inner surface of the PET bottle 2 can be sufficiently sterilized with the hot beverage 50 having a temperature of 71° C. or higher and 95° C. or lower, more preferably 81° C. or higher and 90° C. or lower. Then, due to sufficient sterilization, even if oxygen is enclosed in the filling body 70 together with the beverage 50, the risk of propagation of aerobic bacteria is extremely low. Therefore, the PET bottle 2 is not always filled with the beverage 50. It doesn't matter. Therefore, according to the method according to the present embodiment, the more the filling is, the more likely it is that bacteria will grow on the outer surface of the PET bottle 2, and the higher the temperature of the beverage 50, the more likely the bacteria will be, especially the thermal deformation of the mouth 10. Can be effectively prevented.

As described above, in the method for manufacturing the filling body 70 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 by the in-line method, and thus the PET bottle is used. The heat resistance of No. 2 is kept high. However, from the viewpoint of further maintaining the heat resistance of the PET bottle 2, at least the blow molding of the PET bottle 2 is performed in the manufacturing apparatus 100 of the filling body 70, 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 the area until the temperature is determined.

Next, the cap 60 is supplied to the capper 122 of the hot filling machine 120 (step S8). Note that the cap 60 may be sterilized by, for example, ultraviolet irradiation, but in the manufacturing method of the filling body 70 according to the present embodiment, the cap 60 is not sterilized before filling the beverage 50. You can have it. By sterilizing the cap 60, the filling temperature of the beverage 50 and the temperature of the past riser 140 can be lowered, and the heat resistance of the PET bottle 2 required when manufacturing the filling body 70 can be lowered. it can.

Then, the cap 60 is attached to the PET bottle 2 in the capper 122 (step S9). As a result, the filling body 70 according to the present embodiment is formed. In addition, it is preferable that the steps up to this point be performed in a space where cleanliness, such as a sterile area, and environmental conditions such as temperature and humidity are controlled. The formed filling body 70 is conveyed to the overturn sterilizer 130 by a conveyor belt such as a conveyor.

Next, the overturn sterilizer 130 performs overturn sterilization of the filling body 70 (step S10). The overturn sterilizer 130 conveys the filling body 70 while, for example, laying it over. When the filling body 70 is turned over, the cap 60 and the inner surface of the PET bottle 2 especially near the mouth portion 10 are sterilized by coming into contact with the hot beverage 50.

Then, the pasterizer 140 cools the filling body 70 (step S11). As described above, the temperature of the liquid contained in the first tank of the pasterizer 140 is preferably 70° C. or lower. By rapidly cooling the filling body 70 at 70° C. or lower, damage to the mouth portion 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 70 is gradually lowered by the second tank of the past riser 140 and thereafter, and finally cooled to the normal temperature.

After that, the label is attached to the filling body 70 by the labeler and the caser 150, and then the filling body 70 is boxed in a corrugated board. The filling body 70 according to the present embodiment is manufactured by the above method.

Here, from step S7 in which the PET bottle 2 is filled with the hot beverage 50 to step S11 in which the cap 60 is attached to the PET bottle 2 to step S11 in which the filling body 70 is cooled. The pressure and temperature in the container will be described in detail.

FIG. 17 is a schematic diagram showing an example of the change over time of the temperature inside the PET bottle 2 from the time the hot beverage 50 is filled until it is cooled, and FIG. It is the schematic which showed an example. In addition, in FIG. 17 and FIG. 18, the temperature of the beverage 50 to be filled is set to 85° C., and the test section ex1 cooled for 5 minutes in the first tank of the pasterizer 140 containing the liquid of 75° C. is shown by a solid line. Has been done. On the other hand, in FIGS. 17 and 18, the temperature of the beverage 50 to be filled is similarly set to 85° C., and the test section ex2 cooled for 10 minutes in the first tank of the pasterizer 140 containing the liquid of 65° C. It is shown with a dotted line. Further, in FIG. 18, the atmospheric pressure is indicated by a chain double-dashed line.

As shown in FIG. 17, the inside of the PET bottle 2 is kept at 70° C. or higher for about 5 minutes immediately after filling the hot beverage 50. The PET bottle 2 that has not been completely crystallized is in a state of being easily softened and shrunk during this period. Further, as shown in FIG. 18, after filling the hot beverage 50 and attaching the cap 60, the PET bottle 2 is not expanded during this period due to the expansion of the empty air remaining in the container and the contraction of the PET bottle 2. It is becoming positive pressure. Therefore, the PET bottle 2 during this period is in a state of being easily deformed outward. The test section ex1 has a higher positive pressure. On the other hand, after 10 minutes or more have passed since the high temperature beverage 50 was filled, the inside of the PET bottle 2 became 65° C. or less and the softened state was stopped, and the PET bottle 2 was compressed by shrinking the empty air. It is becoming negative pressure.

Therefore, the specification of the PET bottle 2 is required to be strong against swelling in a state where heat is applied, and further, to be strong enough not to lose its shape when the pressure is reduced thereafter. The PET bottle 2 retains strength against positive pressure and negative pressure due to its shape.

In the rectangular PET bottle 2, since the four wall portions 31 function as surfaces, the pressure change can be effectively absorbed. Furthermore, since the pressure absorbing panel 32 that bends inward is less likely to protrude outward, it is possible to prevent it from yielding to positive pressure and to be deformed as much as possible, and it is unlikely that it will warp outward and harden, so negative pressure is also effective. Can be absorbed. Further, since the concave rib 34 reinforces the pressure absorbing panel 32, it is possible to prevent the pressure absorbing panel 32 from being excessively deformed. In particular, the concave rib 34, which is deepest in the center, can make it more difficult to project to the outside during positive pressure, and therefore can more effectively absorb the pressure change.

It is more difficult for the pressure absorbing panel 32 to pass through a flat state from an outwardly curled state to be recessed inward as compared to being pulled inward as it is from an inwardly curved state. If the pressure absorbing panel 32 warps outward and is solidified and is not deformed when the pressure is reduced, the PET bottle 2 is deformed. On the other hand, if the pressure absorbing panel 32 warps outward and is deformed when the pressure is reduced from the solidified state, the deformation amount of the pressure absorbing panel 32 becomes large and the PET bottle 2 is damaged. Become. However, the PET bottle 2 is difficult to project to the outside even if positively pressurized in a state where it is easily deformed by heat, and is sealed after being filled with the hot beverage 50 and maintained inwardly curved until cooled to room temperature. It is configured to be. Therefore, the PET bottle 2 can effectively exhibit a pressure absorbing effect against negative pressure.

Furthermore, the PET bottle 2 is less likely to be deformed due to heat and pressure change even if uneven thickness occurs in the four wall portions 31 during its manufacture, and the appearance of the filling body 70 is unlikely to be defective. For this reason, it is possible to facilitate the production of the filling body 70, particularly the molding of the PET bottle 2, and to improve the production efficiency and the yield of the filling body 70. Therefore, the filling body 70 in which the PET bottle 2 is filled with the hot beverage 50 can be produced in-line with a good appearance.

Further, the bottom portion 40 of the PET bottle 2 also has a dome 42 protruding inward and radial ribs 43, and is configured so as not to easily protrude outward even if positive pressure is applied in a state where it is easily deformed by heat. It is possible to prevent deformation due to pressure. Further, the height h from the bottom wall 41 to the central portion 42c of the dome 42 is defined, so that even if it is deformed, it is prevented from protruding outward from the bottom wall 41. Therefore, the filling body 70 can be manufactured in-line with a good appearance, and it is possible to prevent the conveyance suitability and the loading efficiency of the filling body 70 from decreasing.

The reduced pressure amount of the filling body 70 manufactured by the method for manufacturing the filling body 70 according to the present embodiment is 1 kPa or more and 15 kPa or less. The reduced pressure amount of the filling body 70 can be measured by a pressure gauge, for example, a diaphragm (diaphragm) pressure gauge. The amount of reduced pressure is measured by inserting a perforation needle that communicates with a detector included in the pressure gauge into the head space of the filling body 70. It is possible to determine whether or not the method for manufacturing the filling body 70 according to the present embodiment is used by measuring the depressurized amount of the filling body 70 manufactured by the manufacturing apparatus 100 configured by the in-line method. The amount of pressure reduction of the filling body 70 at this time is appropriately set to a value according to the contents.

By providing the steps described above, the PET bottle 2 having heat resistance applicable to hot filling, and the filling body 70 in which the filling body 70 hot-filled with the beverage 50 is produced in-line. A method can be provided.

According to the method for manufacturing the filling body 70 according to the present embodiment, unlike the method in which the pre-molded plastic bottle is supplied to the filling device for the contents, the PET bottle 2 is molded at a high temperature without time. The process of filling the beverage 50 can proceed. Therefore, the filling is started before the crystallinity of the body portion 30 of the PET bottle 2 is lowered, and the hot beverage 50 can be filled without lowering the heat resistance thereof. In addition, rather than simply connecting the transport path of the PET bottle 2 between the bottle molding machine 110 (biaxial stretching blow molding device 112) and the hot filling machine 120 (filler 121), these machines are combined as one device. By doing so, the effect is further enhanced.

When a widely used heat resistant bottle is molded, the temperature of the body metal mold 117a is set high, for example, 150° C. or higher and 165° C. or lower. When the temperature of the body mold 117a rises, the initial shrinkage becomes large and deforms, the material of the mold 117 is limited and the cost is high, and the temperature difference from the external environment, especially the temperature is large, and the heat resistance is high. There may be large variations in quality such as heat resistance and shape of bottles. Furthermore, if the temperature of the body die 117a rises, it is necessary to increase the time for which the high-pressure air P2 is blown, and the manufacturing capacity drops. On the other hand, according to the method for manufacturing the filling body 70 according to the present embodiment, it is possible to fill the hot beverage 50 even if the PET bottle 2 has lower heat resistance than the widely used heat-resistant bottle. The temperature of the body mold 117a can be lowered. Therefore, the method of manufacturing the filling body 70 according to the present embodiment can prevent the above-mentioned problems from occurring.

Furthermore, according to the method for manufacturing the filling body 70 according to the present embodiment, an in-line method is used that can mold the PET bottle 2 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 filling body 70 can be reduced.

Further, according to the method for manufacturing the filling body 70 according to the present embodiment, since the method of supplying the preform 1 instead of the PET bottle 2 is used, it is possible to reduce the cost of transporting the material. That is, when the PET bottle 2 is molded in-line, the form of the container supplied to the manufacturing apparatus 100 for the filling body 70 can be changed to the preform 1 having a smaller bulk than the PET bottle 2, and It is possible to greatly increase the number of transportations from the manufacturer, for example, 6 times or more. Therefore, the manufacturing apparatus 100 and the manufacturing method for the filling body 70 according to the present embodiment in which the bottle molding machine 110 for 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, a method of manufacturing the filling body 70 according to another embodiment will be described in detail. FIG. 19 is a flowchart showing an outline of a manufacturing process of the filling body 70 according to another embodiment. The manufacturing method of the filling body 70 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 as compared with the manufacturing method shown in FIG. Here, in the manufacturing method according to another embodiment, the description of the same parts as those in the manufacturing method shown in FIG. 14 will be appropriately omitted.

In the manufacturing method according to another embodiment, as in the manufacturing method shown in FIG. 14, the PET bottle 2 is blow-molded by stretching the preform 1 (step S3). However, in the method for manufacturing the filling body 70 according to another embodiment, the temperature of the surface of the body metal mold 117a is 90° C. or higher and 115° C. or lower.

Also here, the temperature of the body 15 of the preform 1 heated in step S2 is 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 die 117a, the initial shrinkage is less likely to occur.

Then, similarly to the manufacturing method shown in FIG. 14, the body portion 15 of the preform 1 mounted on the mold 117 is longitudinally stretched 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 metal mold 117a.

In the method for manufacturing the filling body 70 according to another embodiment, the blowing of the cooling air C1 to the PET bottle 2 (step S4) is omitted in the step of blow molding. However, in the method of manufacturing the filling body 70 according to another embodiment, the temperature of the surface of the body metal mold 117a is 90° C. or higher and 115° C. or lower, and the temperature of the body portion 15 of the preform 1 to be heated is The temperature is higher than the temperature of the surface of the body mold 117a. As a result, the initial contraction when the body portion 15 of the preform 1 is stretched and hits the body die 117a is effectively suppressed. Therefore, in the manufacturing method of the filling body 70 according to another embodiment, even if the step of blowing the cooling air C1 to the PET bottle 2 (step S4) is omitted, the PET bottle 2 having heat resistance applicable to hot filling, And the filling body 70 hot-filled with the beverage 50 can be produced.

The blow-molded PET bottle 2 is supplied to the hot filling machine 120 (step S5), and thereafter, the filling body 70 is manufactured through the same steps as the manufacturing method shown in FIG. ..

The manufacturing method of the filling body 70 according to another embodiment has the same effects as the manufacturing method shown in FIG. 14.

In addition to this, in the method for manufacturing the filling body 70 according to another embodiment, the temperature of the surface of the body metal mold 117a can be set lower, and therefore, as the material of the metal mold 117, for example, stainless hardened and tempered steel, Aluminum can be used instead of die steel. By using aluminum, the mold 117 can be easily processed, the degree of freedom in design can be increased, and the manufacturing cost can be suppressed. Furthermore, in the method for manufacturing the filling body 70 according to another embodiment, the device for spraying the cooling air C1 can be eliminated. Therefore, it is possible to use the biaxial stretching blow molding device 112 that does not include the cooling air blowing part 119, and it is possible to improve versatility. Furthermore, in the manufacturing method of the filling body 70 according to another embodiment, since the step of blowing the cooling air C1 (step S4) is unnecessary, the PET bottle 2 and the filling body 70 hot-filled with the beverage 50 can be manufactured. The speed can be improved.

As described above, the manufacturing method of the filling body 70 according to the present embodiment includes the step of heating the body portion 15 of the preform 1 and the blowing of the PET bottle 2 from the preform 1 using the mold 117. The step of molding, the step of filling the PET bottle 2 with the hot beverage 50, the step of attaching the cap 60 to the mouth portion 10 of the PET bottle 2, and the tip portion 10 of the PET bottle 2 and the cap 60 are sterilized by overturning. A step of cooling the PET bottle 2 and a step of blowing cooling air C1 to the PET bottle 2 in the step of blow molding, and the body part 15 of the preform 1 is 115° C. or higher and 135° C. The temperature of the body die 117a of the die 117 is set to 90° C. or higher and 125° C. or lower by heating below, and the body die 117a has a rough surface portion 117R on at least a part of the surface, and all the steps are performed in an in-line system. It is characterized by performing in.

Furthermore, the PET bottle 2 is provided with the pressure absorbing panel 32 recessed inward by one step by the method of manufacturing the filling body 70 according to the present embodiment, and the pressure absorbing panel 32 is provided with the concave rib 34 extending between opposite sides, In the horizontal direction, from both ends of the pressure absorption panel 32 toward the center, the PET bottle 2 is curved inward, filled with the hot beverage 50, then sealed, and curved inward until cooled to room temperature. Is produced so that

Then, according to the present embodiment, the PET bottle 2 and the beverage 50, which are produced in-line, have heat resistance applicable to hot filling, and are suppressed from being deformed due to a pressure change in the container at the time of filling, are hot-filled. The filled body 70 and the manufacturing method of the filled body 70 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]
The PET bottle 2 was produced by the method for producing the filling body 70 according to the present embodiment shown in FIG. At that time, a barrel metal mold 117a was used, which was machined to have a rough surface portion 117R on the surface corresponding to the heel portion 37 of the PET bottle 2. The graining was performed by air blasting using aluminum oxide having a particle size of F100 (particle size of 75 μm to 212 μm) as abrasive grains. Preform 1 was made of polyethylene terephthalate. The body portion 15 of the preform 1 was heated to 125° C., and the surface temperature of the body die 117a was set to 125° C. The step of blow molding (step S3) includes the step of blowing cooling air C1 to the PET bottle 2 (step S4).

[Comparative Example 1]
Example 1 was the same as Example 1 except that the surface of the body die 117a was mirror-finished.

<Evaluation method>
(Blow molding evaluation)
The blow moldability of each of the PET bottles 2 of Example 1 and Comparative Example 1 was evaluated. Table 1 shows the results of visual evaluation of the PET bottles 2 produced by blow molding, and is indicated by ◯: no improper shaping, and x: improper shaping.

(sensory test)
From each of the PET bottles 2 of Example 1 and Comparative Example 1, a bottle having excellent tactile sensation (touch) was selected as a monitor for 100 people in their 20s to 70s. Each PET bottle 2 selected for each monitor was aggregated as one point for each person. Table 1 shows the total score.

(Comprehensive evaluation)
Based on the blow molding evaluation and the sensory test described above, a comprehensive evaluation of each PET bottle 2 of Example 1 and Comparative Example 1 was made. Table 1 shows the results of the comprehensive evaluation. The overall evaluation is indicated by ○: good, ×: not suitable.

The following points were derived from the examples described above. As shown in Table 1, in Example 1, the blow moldability was good and the touch was excellent. The surface roughness of the heel portion 37 was measured and found to be 1 μm. In Comparative Example 1, although the heel portion 37 contracted inward at the time of blow molding to cause improper shaping such as waviness, the touch feeling was slightly excellent.

Since the method for manufacturing the filling body 70 according to the present embodiment is an in-line method, the blow molding time is shortened as much as possible, and the PET bottle 2 is likely to contract. However, from the results of Example 1 described above, it was shown that the PET bottle 2 having excellent blow moldability and excellent tactile sensation can be manufactured by the method for manufacturing the filling body 70 according to the present embodiment.

<Material and manufacturing method>
[Example 2]
By the method for manufacturing the filling body 70 according to the present embodiment shown in FIG. 14, the filling body 70 in which the PET bottle 2 shown in FIG. That is, the step of blow-molding the PET bottle 2 (step S3) and the step of filling the PET bottle 2 with the hot beverage 50 (step S7) are performed by an in-line method, and the inward bending of the pressure absorption panel 32 is performed. However, it has a feature that it is maintained from the filling of the hot beverage 50 to the cooling to normal temperature. Preform 1 was made of polyethylene terephthalate. Water at 85° C. was used for the beverage 50. The body portion 15 of the preform 1 was heated to 125° C., and the surface temperature of the body die 117a was set to 125° C. The step of blow molding (step S3) includes the step of blowing cooling air C1 to the PET bottle 2 (step S4). The pressure absorbing panel 32 is formed so as to be curved inward of the PET bottle 2 from both ends of the pressure absorbing panel 32 toward the center in the horizontal direction.

[Comparative Example 2]
Example 2 was the same as Example 2 except that the pressure absorbing panel was formed flat in the vertical direction without being curved inward of the container in the horizontal direction.

<Evaluation method>
(Visual inspection)
The appearance of each of the PET bottles 2 of Example 2 and Comparative Example 2 was evaluated.

The following points were derived from the examples described above. In Example 2, the pressure absorbing panel 32 of the filling body 70 did not protrude outside the PET bottle 2 and had a good appearance. In Comparative Example 2, the pressure-absorbing panel had some protrusions to the outside on the first to fourth surfaces, and the appearance was not good.

From the results of Example 2 described above, the PET bottle 2 according to the present embodiment is difficult to project to the outside even under positive pressure in a state where it is easily deformed by heat, is sealed after being filled with the hot beverage 50, and is kept at room temperature. Inward curvature was maintained until cooled. That is, it was shown that the PET bottle 2 can be filled with the hot beverage 50 without any problem according to the method for manufacturing the filling body 70 according to the present embodiment. Therefore, in the present embodiment, the PET bottle 2, the filling body 70, and the filling body which are produced in-line, have heat resistance applicable to hot filling, and are suppressed from being deformed due to a pressure change in the container during filling. It was shown that a manufacturing method of 70 can be provided.

INDUSTRIAL APPLICABILITY The present disclosure can be suitably used for manufacturing various filling bodies 70 filled with a liquid as contents. However, the present disclosure is not limited to the embodiments and examples described above. Filler 70 of the present disclosure, for example, various non-carbonated beverages such as water, green tea, oolong tea, black tea, coffee, fruit juice, soft drinks, and carbonated beverages, or seasonings such as soy sauce, sauce, mirin, etc. It is useful for any filling body 70 that contains cooking oil, foods including liquor, detergents, shampoos, cosmetics, pharmaceuticals, etc. Since the container has heat resistance, it is heated and sold at vending machines and stores. Also suitable for.

1 Preform 2 PET bottle (plastic bottle)
10 Mouth part 15 Body part of preform 20 Shoulder part 21 Straight part 30 Body part of PET bottle 2 31 Wall part 32 Pressure absorption panel 33 Step wall surface 34 Concave rib (rib)
37 Heel part 40 Bottom part 41 Bottom wall 42 Dome 42c Central part of the dome 43 Rib 50 Beverage (liquid)
60 Cap 70 Filler 100 Manufacturing Device 110 Bottle Molding Machine 111 Heating Device (Heating Section)
112 Biaxial stretch blow molding machine (molding section)
117R Rough surface part 117a Body mold 120 Hot filling machine 121 Filler (filling part)
122 Capper (mounting part)
130 Fall sterilizer (fall sterilization unit)
140 pass try (cooling unit)
C1 Cooling air D1 Outer diameter of preform 1 D4 Outer diameter of PET bottle 2 d1 Curvature amount at center of step wall surface 33 d2 Depth at center of concave rib 34 H1 Height of body part 15 of preform H2 PET Height of the body portion 30 of the bottle 2 h Height from the bottom wall 41 to the central portion 42c of the dome 42 L Length of the linear portion 21

Claims (13)

A square plastic bottle having a heat resistance against a high temperature liquid to be filled, which is molded from an amorphous preform,
The high temperature is 81° C. or higher and 90° C. or lower,
The body has a wall,
The wall portion includes a pressure absorbing panel,
The pressure absorbing panel includes a step wall surface, an inclined surface, and a plurality of ribs extending in the horizontal direction between the step wall surfaces,
The stepped wall surface is connected to the wall portion through the inclined surface and is recessed inward,
The step wall, in a normal pressure state, in the horizontal direction, from the left and right ends of the step wall toward the center, curved inward of the plastic bottle,
It is characterized in that it is sealed after being filled with the high temperature liquid, and the inward bending is maintained until the pressure in the plastic bottle changes from positive pressure to negative pressure and is cooled to room temperature. Plastic bottle. The rib is recessed ribs, plastic bottle according to claim 1, wherein the deeper of isosamples toward the left and right ends to the center. The pressure absorbing panel,
The plastic bottle according to any one of claims 1 and 2, further characterized by being curved inward from the upper and lower ends of the pressure absorbing panel toward the center in the vertical direction. 4. The plastic bottle according to claim 1, wherein the surface roughness Ra of the body is 0.3 μm or more and 3 μm or less. The material constituting the plastic bottle is polyethylene terephthalate, and the density of the body portion is 1.367 g/cm ³ or more and 1.380 g/cm ³ or less, wherein any one of claims 1 to 4 is characterized. The plastic bottle according to item. 6. The plastic bottle according to claim 1, wherein the body has a crystallinity of 25% or more and 39% or less. The said body part is cut out into the cut piece of 10 mm x 50 mm, and the tensile fracture strain at 300 mm/min of 85% of this cut piece is 40% or more and 68% or less, The said 1 thru|or 1 characterized by the above-mentioned. 6. The plastic bottle according to any one of 6 above. The plastic bottle according to any one of claims 1 to 7, wherein a longitudinal stretching ratio from the preform to the plastic bottle is 1.8 or more and 4.0 or less. The plastic bottle according to any one of claims 1 to 8, wherein a transverse stretching ratio from the preform to the plastic bottle is 1.8 or more and 3.0 or less. The shoulder portion has a straight portion that extends in the vertical direction from the connection end with the body portion,
The plastic bottle according to any one of claims 1 to 9, wherein the length of the linear portion is formed to be 5 mm or more and 10 mm or less. The bottom is
A dome that protrudes inward from the bottom wall of the substantially flat plate ring,
A rib provided radially on the dome,
The height from the bottom wall to the central part of the dome is 4 mm or more and 20 mm or less, The plastic bottle according to any one of claims 1 to 10. A plastic bottle according to any one of claims 1 to 11,
A filling body comprising the high temperature liquid,
The filled body, wherein the reduced pressure amount of the filled body at room temperature is 1 kPa or more and 15 kPa or less. A method of manufacturing a filling body in which the mouth is molded from a preform that is amorphous, and the high temperature liquid is filled into a rectangular plastic bottle having heat resistance to the high temperature liquid to be filled,
The high temperature is 81° C. or higher and 90° C. or lower,
Heating the body of the preform,
A step of blow molding the plastic bottle from the preform using a mold;
Filling the plastic bottle with the liquid at the high temperature,
Attaching a cap to the mouth of the plastic bottle;
A step of sterilizing the mouth and the cap of the plastic bottle by overturning;
And a step of cooling the plastic bottle,
In the blow molding step, further comprising a step of blowing cooling air to the plastic bottle,
Heating the body portion of the preform to 115° C. or higher and 135° C. or lower, and setting the temperature of the body die of the mold to 90° C. or higher and 125° C. or lower;
The body mold has a rough surface portion on at least a part of the surface,
All processes are done inline,
The plastic bottle includes a wall,
The wall portion includes a pressure absorbing panel,
The pressure absorbing panel includes a step wall surface, an inclined surface, and a plurality of ribs extending in the horizontal direction between the step wall surfaces,
The stepped wall surface is connected to the wall portion through the inclined surface and is recessed inward,
The step wall, in a normal pressure state, in the horizontal direction, from the left and right ends of the step wall toward the center, curved inward of the plastic bottle,
After being filled with the hot liquid, it is sealed , and the pressure inside the plastic bottle is changed from positive pressure to negative pressure, and the inward bending is maintained until it is cooled to room temperature. A method for manufacturing a filling body, comprising:

Images