JP6894085B2

JP6894085B2 - Nitrogen-filled polyester resin bottle for hot pack and nitrogen-filled filling method for hot pack contents

Info

Publication number: JP6894085B2
Application number: JP2017143650A
Authority: JP
Inventors: 政志上利
Original assignee: パイオニア工業株式会社
Priority date: 2017-07-25
Filing date: 2017-07-25
Publication date: 2021-06-23
Anticipated expiration: 2037-07-25
Also published as: JP2019026268A

Description

本発明は、ワインのようなホットパック用飲料内容物の窒素封入充填に適したホットパック用ポリエステル樹脂製ボトルとホットパック用内容物の窒素封入充填方法とに関するものである。 The present invention relates to a polyester resin bottle for hot packs suitable for nitrogen filling and filling of beverage contents for hot packs such as wine, and a nitrogen filling and filling method for the contents for hot packs.

従来、ワインのような加温充填（ホットパック）されるホットパック用内容物はガラス壜に詰められ流通している。しかし、ガラス壜は重く、割れるという問題があり、ガラス壜に代えて、軽く、割れ難いポリエステル樹脂製の容器、例えばＰＥＴボトルに詰めて流通させる方法が種々検討されている。 Conventionally, the contents for hot packs, such as wine, which are heated and filled (hot packed), are packed in glass bottles and distributed. However, glass bottles have a problem of being heavy and cracking, and various methods have been studied in place of glass bottles in a light and hard-to-break polyester resin container, for example, a PET bottle.

例えば、特許文献１には、容器の容量を一回の飲み切りに適する容量とするとともに、容器の形状を、ワイン用ガラス壜を模して、容器最上部の口部と、この口部に連接する細長首部と、この細長首部に連接して容器外方に拡径する肩部と、この肩部に連接して略円筒状とされた胴部とを備えた容器形状とする工夫が示されている。 For example, in Patent Document 1, the capacity of the container is set to a capacity suitable for one drinking, and the shape of the container is similar to that of a glass bottle for wine, and the uppermost mouth of the container and this mouth are used. A device to create a container shape with an elongated neck that is connected, a shoulder that is connected to the elongated neck and expands to the outside of the container, and a body that is connected to this shoulder and has a substantially cylindrical shape is shown. Has been done.

また同様に特許文献２に示された合成樹脂製のシャンパンボトルについても、ワイン用ガラス壜の形状のように口部と細長首部と肩部と胴部とを備える容器形状とするとともに、底部を容器内方であって容器高さ方向上方に向けて凸となるように凹入させている点が示されている。 Similarly, the synthetic resin champagne bottle shown in Patent Document 2 has a container shape having a mouth, an elongated neck, a shoulder and a body like a glass bottle for wine, and the bottom has a bottom. It is shown that the inside of the container is recessed so as to be convex upward in the height direction of the container.

さらに特許文献３では、ワイン用のプラスチック容器において、容器内に酸素が侵入してワインを酸化させるのを抑えるためにガスバリア層を設けるようにした工夫が示されている。 Further, Patent Document 3 discloses a device in which a gas barrier layer is provided in a plastic container for wine in order to prevent oxygen from entering the container and oxidizing the wine.

特開２０１３−１５９３５２号公報Japanese Unexamined Patent Publication No. 2013-159352 米国特許公開第２０１０００１２６１７号明細書（ＵＳ２０１０／００１２６１７Ａ１）U.S. Patent Publication No. 20110112617 (US2010 / 0012617A1) 特開２０１７−０１３８３３号公報Japanese Unexamined Patent Publication No. 2017-013833

ところで、ワインのようなホットパック用内容物は、５０℃前後の加温状態で充填されるが、ワイン用ガラス壜を模した容器形状のＰＥＴボトルに充填すると、そのホットパック用内容物は、容器密封後、充填時の高温状態から、室温に冷却され、更には０℃のような低温で保管されるため、そのような冷却過程で、内容物の体積が収縮し、その結果、容器内は負圧状態となり、容器の胴部、底部などに負荷がかかって変形などが起こることが懸念される。 By the way, the contents for hot packs such as wine are filled in a heated state of about 50 ° C., but when filled in a PET bottle in the shape of a container imitating a glass bottle for wine, the contents for hot packs are filled. After sealing the container, it is cooled to room temperature from the high temperature state at the time of filling, and further stored at a low temperature such as 0 ° C. Therefore, in such a cooling process, the volume of the contents shrinks, and as a result, the inside of the container Is in a negative pressure state, and there is a concern that the body and bottom of the container may be loaded and deformed.

前記充填されたホットパック用内容物が冷却されて、体積が収縮することを原因とする容器の変形を防止するために、容器の肉厚を大きくしたり、補強ビードを入れるなどの強度を向上させる方法があり、お茶やジュースなどを内容物とするホットパック用ＰＥＴボトルにおいては、内容物の体積収縮による負圧を吸収するために胴部に減圧吸収パネル部を設けるなどの対策が採られているが、ワイン用ボトルにおいては、ガラス壜様の形状という容器のデザインの制約があり、前記手段は採り難い。 In order to prevent deformation of the container due to the cooling of the filled contents for hot pack and shrinkage of the volume, the wall thickness of the container is increased and the strength such as inserting a reinforcing bead is improved. For PET bottles for hot packs containing tea or juice as the contents, measures such as providing a decompression absorption panel on the body to absorb the negative pressure due to volume shrinkage of the contents are taken. However, in the case of wine bottles, there are restrictions on the design of the container, which is the shape of a glass bottle, and it is difficult to use the above-mentioned means.

そこで、ワインの様なホットパック用飲料に対し、前記ワイン用ガラス壜などを模した減圧吸収部を備えない容器形状のＰＥＴボトルを用いる場合には、内容物の体積収縮による負圧を吸収するために充填時に液体窒素を滴下封入し、封入窒素のガス圧により容器内の負圧を吸収し、陽圧状態にする窒素封入充填方法が種々検討されている。 Therefore, when a container-shaped PET bottle that does not have a decompression absorption part imitating the glass bottle for wine or the like is used for a hot-packed beverage such as wine, the negative pressure due to the volume shrinkage of the contents is absorbed. Therefore, various nitrogen-filled filling methods have been studied in which liquid nitrogen is dropped and filled at the time of filling, and the negative pressure in the container is absorbed by the gas pressure of the filled nitrogen to bring it into a positive pressure state.

前記窒素封入充填方法は、ホットパック用内容物を加温状態で容器に充填した後、ヘッドスペースに液体窒素を滴下し、直ちに口部を密封することにより、ヘッドスペースの気化窒素ガス圧により容器内圧を高め、充填後の内容物の冷却による体積収縮に基づく減圧を吸収し容器の減圧変形を抑制するという充填方法であり、お茶やジュースなどを収容する一般的なホットパック内容物充填ＰＥＴボトルにおいては種々検討されている。 In the nitrogen-filled filling method, after filling the container with the contents for hot pack in a heated state, liquid nitrogen is dropped into the head space and the mouth is immediately sealed, so that the container is heated by the vaporized nitrogen gas pressure of the head space. It is a filling method that increases the internal pressure, absorbs the decompression based on the volume shrinkage due to the cooling of the contents after filling, and suppresses the decompression deformation of the container. Has been studied in various ways.

（内容物をワイン飲料などとする前記ホットパック用ＰＥＴボトルで液体窒素の充填を行なう場合の問題）
前記窒素封入充填方法では、液体窒素の滴下量が多すぎると内圧が高くなりすぎて、容器の膨張が大きくなり、弾性変形と塑性変形が起こり、その後常温になっても塑性変形分の体積が元に戻らず、ヘッドスペースの内容物の液面が低下するという問題があり、これは消費者に好まれない。特に、前記特許文献２に開示のような凹入形状の底部では充填直後の高い内圧によって該凹入底部が変形、或いは外方へ反転突出し、復元しないという問題が生じることが懸念される。 (Problem when filling liquid nitrogen with the PET bottle for hot pack whose contents are wine beverages, etc.)
In the nitrogen-filled filling method, if the amount of liquid nitrogen dropped is too large, the internal pressure becomes too high, the container expands greatly, elastic deformation and plastic deformation occur, and then the volume of the plastic deformation increases even at room temperature. There is a problem that the liquid level of the contents of the headspace is lowered without returning to the original state, which is not preferred by consumers. In particular, in the recessed bottom portion as disclosed in Patent Document 2, there is a concern that the recessed bottom portion may be deformed or inverted and protrude outward due to a high internal pressure immediately after filling, and may not be restored.

また、液体窒素の滴下量が少なすぎると、室温、更には０℃に冷却したときの内容物の体積収縮による減圧を吸収し切れず、容器内が負圧状態のままとなり、容器の強度が弱い部位に減圧による変形、凹みなどが生じることが懸念される。 Further, if the amount of liquid nitrogen dropped is too small, the reduced pressure due to the volume shrinkage of the contents when cooled to room temperature or 0 ° C. cannot be completely absorbed, and the inside of the container remains in a negative pressure state, and the strength of the container becomes high. There is a concern that deformation and dents may occur in weak parts due to decompression.

したがって、液体窒素充填方法で用いられるホットパック用ＰＥＴボトルにおいては、充填後の内容物が冷却される過程で生じる体積収縮による減圧を見越して、前記減圧を吸収できるように液体窒素を滴下封入する必要があり、窒素封入ホットパック用容器としては、前記窒素封入ホットパック充填直後の気化窒素ガスによる高圧状態に耐えて、内容物の温度が低下したときに容器各部に塑性変形が生じず、また底部の反転突出などの不可逆的な形状変化の無い、或いは実用上問題とならない範囲に抑制されたＰＥＴボトルが求められる。 Therefore, in the PET bottle for hot pack used in the liquid nitrogen filling method, liquid nitrogen is added dropwise so that the reduced pressure can be absorbed in anticipation of the reduced pressure due to the volume shrinkage that occurs in the process of cooling the filled contents. As a container for a nitrogen-filled hot pack, it is necessary to withstand a high-pressure state due to vaporized nitrogen gas immediately after filling the nitrogen-filled hot pack, and when the temperature of the contents drops, plastic deformation does not occur in each part of the container. There is a need for a PET bottle that does not have irreversible shape changes such as reverse protrusion of the bottom, or is suppressed to a range that does not pose a problem in practical use.

また、窒素封入量が少なく減圧吸収が不十分な場合において、内容物の室温への冷却、さらには０℃のような低温での保管という取扱い過程での内容物の大きな体積収縮に基づく減圧が吸収しきれずに負圧が残存した状態となっても、容器の形状変化が実用上問題とならない範囲に抑制されるＰＥＴボトルが求められる。 In addition, when the amount of nitrogen filled is small and absorption under reduced pressure is insufficient, depressurization based on large volume shrinkage of the contents during the handling process of cooling the contents to room temperature and storing at a low temperature such as 0 ° C. There is a need for a PET bottle in which the change in the shape of the container is suppressed within a range that does not pose a practical problem even if the negative pressure remains without being completely absorbed.

更に、前記窒素封入ホットパック用ＰＥＴボトルに、窒素ガスとホットパック用内容物を充填密封する方法では、窒素と内容物が充填されたＰＥＴボトルの、充填段階、及び流通過程や一般小売店舗などでの保存段階までに亘って使用される過程での陽圧による変形や、負圧による変形等の問題が実用上問題とならない範囲に抑制されるように、前記充填内容物、及び使用するホットパック用ＰＥＴボトルに適した最適な窒素充填条件でホットパック飲料内容物を充填することが求められる。 Further, in the method of filling and sealing the nitrogen-filled PET bottle for hot pack with nitrogen gas and the contents for hot pack, the filling stage, distribution process, general retail store, etc. of the PET bottle filled with nitrogen and contents, etc. The filling contents and the hot used so that problems such as deformation due to positive pressure and deformation due to negative pressure in the process of being used up to the storage stage in the above are suppressed to a range that does not pose a practical problem. It is required to fill the hot-packed beverage contents under the optimum nitrogen filling conditions suitable for the PET bottle for packing.

本発明は前記事情に鑑み、前記のようなワイン用ガラス壜の形状を模したホットパック用ポリエステル樹脂製ボトルに、ワイン飲料のようなホットパック用内容物を窒素封入充填する場合に好適な窒素封入ホットパック用ポリエステル樹脂製ボトル、及び該ボトルを用いた好適なホットパック用内容物の窒素封入充填方法を提供することを目的とする。 In view of the above circumstances, the present invention is suitable for filling a polyester resin bottle for a hot pack that imitates the shape of a glass bottle for wine as described above with nitrogen-filled contents for a hot pack such as a wine beverage. It is an object of the present invention to provide a polyester resin bottle for an enclosed hot pack and a suitable nitrogen-filled filling method for the contents for a hot pack using the bottle.

（請求項１の発明）
本発明は上記課題を考慮してなされたもので、口部と、前記口部の下部に連接する首部と、前記首部の下部に連接し、容器外方に向けて拡径されて首部の外径より大径とされている肩部と、前記肩部の下部に連接して略円筒形状とされている胴部と、平面形状が円環状とされている接地部と、前記胴部の下方に位置してこの胴部に連接するとともに、外径が容器高さ方向での下方に向けて漸次小径となり前記接地部に連接する胴部傾斜下部と、前記接地部の内周部に連接している凹入底部とを備える窒素封入ホットパック用ポリエステル樹脂製ボトルにおいて、
前記凹入底部は、前記接地部の内周部から略垂直に容器高さ方向での上方に向けて立ち上がる周壁部と、前記周壁部の上辺部に連接されていて、縦断面形状が、前記周壁部の上辺部から容器高さ方向での上方に向けて凸の弧状を呈して凹入底部の中心側に向けて漸次傾斜した形状とされ、周壁部より容器高さ方向上方の位置に形成されている曲面部と、前記曲面部の内周部に連接して凹入底部中央に位置し、天頂部分が略平坦とされて、前記曲面部より容器高さ方向上方の位置に形成されている底部中央部とからなり、容器内方に向けて凹入している凹入形状とされていることを特徴とする窒素封入ホットパック用ポリエステル樹脂製ボトルを提供して前記課題を解消するものである。 (Invention of claim 1)
The present invention has been made in consideration of the above problems, and is connected to the mouth part, the neck part connected to the lower part of the mouth part, and the lower part of the neck part, and the diameter is expanded toward the outside of the container to the outside of the neck part. A shoulder portion having a diameter larger than the diameter, a body portion connected to the lower part of the shoulder portion and having a substantially cylindrical shape, a ground contact portion having an annular shape in a plane shape, and a lower portion of the body portion. The outer diameter gradually decreases downward in the container height direction, and the lower part of the body that is connected to the ground contact portion is connected to the inner peripheral portion of the ground contact portion. In a nitrogen-filled polyester resin bottle for hot packs with a recessed bottom
The recessed bottom portion is connected to a peripheral wall portion that rises substantially vertically upward from the inner peripheral portion of the ground contact portion in the container height direction and an upper side portion of the peripheral wall portion, and has a vertical cross-sectional shape. It has a convex arc shape from the upper side of the peripheral wall toward the upper side in the container height direction, and is gradually inclined toward the center side of the recessed bottom, and is formed at a position above the peripheral wall in the container height direction. The curved surface portion is connected to the inner peripheral portion of the curved surface portion and is located at the center of the recessed bottom portion, the zenith portion is made substantially flat, and is formed at a position above the curved surface portion in the container height direction. A polyester resin bottle for a nitrogen-filled hot pack, which is composed of a central portion of a bottom portion and has a recessed shape that is recessed toward the inside of the container, to solve the above-mentioned problems. Is.

（請求項２の発明）
また、本発明において、前記円環状の接地部の内周部の直径は、胴部最大外径とされている前記胴部傾斜下部の直上の胴部外径の６０〜７３％の範囲とされていることが良好である。 (Invention of claim 2)
Further, in the present invention, the diameter of the inner peripheral portion of the annular ground contact portion is in the range of 60 to 73% of the outer diameter of the body portion directly above the lower portion of the inclined portion of the body portion, which is the maximum outer diameter of the body portion. It is good to have.

（請求項３の発明）
また、本発明において、前記凹入底部の平坦頂部における接地部の接地面からの容器高さ方向での高さが、前記接地部の内周部の直径の２０〜３０％の範囲とされていることが良好である。 (Invention of claim 3)
Further, in the present invention, the height of the ground contact portion at the flat top of the recessed bottom portion in the container height direction from the ground contact surface is in the range of 20 to 30% of the diameter of the inner peripheral portion of the ground contact portion. It is good to be there.

（請求項４の発明）そして、本発明において、前記円環状の接地部の内周と外周の間隔である接地幅が０．９〜２．５ｍｍの範囲とされていることが良好である。 (Invention of claim 4) In the present invention, it is preferable that the ground contact width, which is the distance between the inner circumference and the outer circumference of the annular ground contact portion, is in the range of 0.9 to 2.5 mm.

（請求項５の発明）
また、本発明において、前記首部は、容器高さ方向での長さが容器高さの２０〜３０％の範囲の細長形状とされ、前記細長の首部は、その外径が前記口部の外径より大とされて、前記口部側から肩部側に向けて漸次大径となる形状とされていること良好であり、ワイン飲料用の窒素封入ホットパック用ポリエステル樹脂製ボトルとして好適である。 (Invention of claim 5)
Further, in the present invention, the neck portion has an elongated shape in which the length in the container height direction is in the range of 20 to 30% of the container height, and the elongated neck portion has an outer diameter outside the mouth portion. It is good that the diameter is larger than the diameter and the diameter gradually increases from the mouth side to the shoulder side, which is suitable as a polyester resin bottle for a nitrogen-filled hot pack for wine beverages. ..

（請求項６の発明）
もう一つの発明は、窒素封入ホットパック用ポリエステル樹脂製ボトルに、４０〜６０℃に加温されたホットパック用内容物を窒素封入充填する方法であって、前記ボトルに前記加温内容物と液体窒素を滴下注入後に口部を密封した充填密封直後の前記充填容器のヘッドスペースがボトル内容積の２〜６％で、前記ヘッドスペースの内圧が６０〜１５０ｋＰａの陽圧で充填密封することを特徴とするホットパック用内容物の窒素封入充填方法であり、このホットパック用内容物の窒素封入充填方法を提供して上記課題を解消するものである。 (Invention of claim 6)
Another invention is a method in which a nitrogen-filled polyester resin bottle for a hot pack is filled with nitrogen-filled contents for a hot pack heated to 40 to 60 ° C., and the bottle is filled with the heated contents. The head space of the filling container immediately after filling and sealing the mouth after dropping and injecting liquid nitrogen is 2 to 6% of the internal volume of the bottle, and the internal pressure of the head space is filled and sealed with a positive pressure of 60 to 150 kPa. It is a nitrogen-filled filling method for hot-packed contents, which is characterized by providing a nitrogen-filled filling method for hot-packed contents to solve the above-mentioned problems.

（請求項１の発明の効果）
請求項１に係る発明によれば、液体窒素滴下封入ホットパック充填におけるキャップ取り付け直後の急激な内圧の上昇によっても凹入底部などの形状変形が起き難く、その後の冷却過程での内容物の体積収縮に基づく内圧低下も封入窒素によって適切に抑えられ、接地部、及び凹入底部の形状変形などが起き難い。そのため、容器の外観、機能などに影響を与えることが無い。 (Effect of the invention of claim 1)
According to the invention of claim 1, the shape of the recessed bottom and the like is unlikely to be deformed even by a sudden increase in internal pressure immediately after the cap is attached in the liquid nitrogen dropping-filled hot pack filling, and the volume of the contents in the subsequent cooling process. The decrease in internal pressure due to shrinkage is also appropriately suppressed by the enclosed nitrogen, and the shape of the ground contact portion and the recessed bottom portion is unlikely to be deformed. Therefore, the appearance and function of the container are not affected.

そして、首部の直径を、ワイン用ガラス壜などの形状を模したボトルのデザイン的な許容範囲で大きくすることができる。ホットパック充填後に内容物が冷却され、その内容物の体積が収縮したことにより、首部の内側において内容物の液面高さ位置（入り身線）が降下するが、このように首部の直径を大きくすることで、液面の降下を抑えることができる。 Then, the diameter of the neck can be increased within the design tolerance of a bottle that imitates the shape of a glass bottle for wine or the like. After filling the hot pack, the contents are cooled and the volume of the contents is contracted, so that the liquid level height position (entrance line) of the contents is lowered inside the neck, and the diameter of the neck is reduced in this way. By increasing the size, it is possible to suppress the drop in the liquid level.

（請求項２の発明の効果）
請求項２の発明によれば、前記接地部の内周部の直径は、胴部最大外径とされている前記胴部傾斜下部の直上の胴部外径の６０〜７３％の範囲とされていることが良好であり、接地部の内周部の直径が前記範囲を超えて大きいと、ボトルの起立安定性は良いが、内圧により底形状が変化し易くなり、一方、接地部の内周部の直径が前記範囲を超えて小さいとボトルの起立安定性が低下し、倒れ易くなり搬送性が悪くなるという可能性がある。 (Effect of the invention of claim 2)
According to the invention of claim 2, the diameter of the inner peripheral portion of the ground contact portion is in the range of 60 to 73% of the outer diameter of the body portion directly above the lower portion of the inclined portion of the body portion, which is the maximum outer diameter of the body portion. If the diameter of the inner peripheral portion of the ground contact portion is larger than the above range, the standing stability of the bottle is good, but the bottom shape is likely to change due to the internal pressure, while the inside of the ground contact portion. If the diameter of the peripheral portion is smaller than the above range, the standing stability of the bottle may be lowered, and the bottle may easily fall over and the transportability may be deteriorated.

（請求項３の発明の効果）
請求項３の発明によれば、前記凹入底部の平坦頂部における接地部の接地面からの容器高さ方向での高さが、前記接地部の内周部の直径の２０〜３０％の範囲とされていることが良好であり、平坦頂部の高さが前記範囲を超えて小さいと耐圧強度が低くなり、内圧が高まると内圧により容器外方に向けて変形し易くなり、また平坦頂部の高さが前記範囲を超えて大きくなると、内容量が不足するおそれがある。 (Effect of the invention of claim 3)
According to the invention of claim 3, the height of the ground contact portion at the flat top of the recessed bottom portion in the container height direction from the ground contact surface is in the range of 20 to 30% of the diameter of the inner peripheral portion of the ground contact portion. If the height of the flat top exceeds the above range, the pressure resistance strength becomes low, and if the internal pressure increases, the internal pressure makes it easy to deform toward the outside of the container, and the flat top If the height exceeds the above range, the internal capacity may be insufficient.

（請求項４の発明の効果）
請求項４の発明によれば、接地部の接地幅が０．９〜２．５ｍｍの範囲とすることが良好であり、この範囲を超えて広いと、ボトルの内圧が高くなったとき、凹入底部が変形してボトル全高が高くなり、傾きやすく、起立安定性が低下するおそれがあり、狭いと、ボトルの接地が不安定となるが、前述の範囲とすることで前記のような問題がない。 (Effect of the invention of claim 4)
According to the invention of claim 4, it is good that the ground contact width of the ground contact portion is in the range of 0.9 to 2.5 mm, and if it is wider than this range, it is concave when the internal pressure of the bottle becomes high. The bottom of the bottle is deformed and the total height of the bottle becomes high, and it tends to tilt, which may reduce the standing stability. If it is narrow, the grounding of the bottle becomes unstable. There is no.

（請求項５の発明の効果）
請求項５の発明によれば、前記首部は、容器高さ方向での長さが容器高さの２０〜３０％の範囲の細長形状とされ、前記細長の首部は、その外径が前記口部の外径より大とされて、前記口部側から肩部側に向けて漸次大径となる形状とされていることにより、ボトルの形状を、ワイン用ガラス壜などの形状を模したデザインにすることが容易になり、ヘッドスペースの液面高さの大きな変化を抑えることができるため、ワイン飲料用ポリエステル樹脂製ボトルとして好適なものとなる。 (Effect of the invention of claim 5)
According to the invention of claim 5, the neck portion has an elongated shape in the range of 20 to 30% of the container height in the length in the container height direction, and the elongated neck portion has an outer diameter of the mouth. The shape of the bottle is designed to imitate the shape of a glass bottle for wine, etc. by making it larger than the outer diameter of the part and gradually increasing the diameter from the mouth side to the shoulder side. This makes it easy to use, and it is possible to suppress a large change in the liquid level of the head space, which makes it suitable as a polyester resin bottle for wine beverages.

（請求項６の発明の効果）
前記発明の窒素封入ホットパック用ポリエステル樹脂製ボトルに液体窒素を滴下し、ホットパック用内容物を充填する方法としては、内容物を充填後のボトルのヘッドスペースの内圧が所望の適正な圧力になるように液体窒素を滴下封入することが重要である。前記発明のボトルでは、４０〜６０℃の加温内容物をホットパック充填する場合、加温内容物を充填し液体窒素を滴下下直後に密封して形成された容器のヘッドスペースが、ボトル内容積の２〜６％で、前記ヘッドスペースの内圧が、６０〜１５０ｋＰａ、好適には８０〜１４０ｋＰａの陽圧とされる充填条件でホットパック用内容物が窒素封入充填されることが適している。 (Effect of the invention of claim 6)
In the method of dropping liquid nitrogen into the nitrogen-filled polyester resin bottle for hot pack of the present invention and filling the contents for hot pack, the internal pressure of the head space of the bottle after filling the contents becomes a desired appropriate pressure. It is important to drop and enclose liquid nitrogen so that it becomes. In the bottle of the above invention, when the heated contents at 40 to 60 ° C. are filled in a hot pack, the head space of the container formed by filling the heated contents and sealing the liquid nitrogen immediately after dropping is the bottle contents. It is suitable that the contents for hot packing are filled with nitrogen under a filling condition in which the internal pressure of the headspace is 60 to 150 kPa, preferably 80 to 140 kPa at 2 to 6% of the product. ..

ヘッドスペースの体積が、前記の数値範囲を超えて小さい場合、窒素ガス封入ホットパック内容物充填ポリエステル樹脂製ボトルの充填直後の内圧が高くなりすぎ、また、ヘッドスペースの体積が、前記の数値範囲を超えて大きすぎると、内容物の液面が下がりすぎてしまい、消費者に好まれないほどに液面が下がることが懸念される。
また、ヘッドスペース内圧が前記数値範囲を超えて小さいと、ホットパック内容物の冷却時の体積収縮に基づく減圧を適切に吸収できず、前記数値を超えて大きいと、充填密封直後の内圧が大きくなりすぎて、容器に過剰な陽圧を加えすぎて、変形を助長することが懸念される。 If the volume of the headspace is smaller than the above numerical range, the internal pressure immediately after filling the nitrogen gas-filled hot pack content-filled polyester resin bottle becomes too high, and the volume of the headspace is within the above numerical range. If it is too large, the liquid level of the contents will drop too much, and there is a concern that the liquid level will drop to the extent that consumers do not like it.
Further, if the internal pressure of the head space is smaller than the above numerical range, the decompression based on the volume shrinkage at the time of cooling the contents of the hot pack cannot be appropriately absorbed, and if it is larger than the above numerical value, the internal pressure immediately after filling and sealing is large. There is a concern that it will become too much and apply excessive positive pressure to the container, which will promote deformation.

本発明に係る窒素封入ホットパック用ポリエステル樹脂製ボトルの実施の形態を示す説明図である。It is explanatory drawing which shows the embodiment of the polyester resin bottle for nitrogen-filled hot pack which concerns on this invention. 実施の形態における凹入底部を断面で示す説明図である。It is explanatory drawing which shows the recessed bottom part in embodiment in the cross section. 本発明に係るホットパック用内容物の窒素封入充填方法の実施の形態による窒素ガス封入ホットパック用内容物充填ポリエステル樹脂製ボトルを示す説明図である。It is explanatory drawing which shows the nitrogen gas-filled content-filled polyester resin bottle for a nitrogen gas-filled hot pack according to embodiment of the nitrogen-filled filling method of the contents for a hot pack which concerns on this invention.

つぎに本発明を図示の実施の形態に基づいて詳細に説明する。図１は内容物としてワイン飲料などの飲料を窒素封入でホットパック充填する窒素封入ホットパック用ポリエステル樹脂製ボトルで、ポリエステル樹脂製のプリフォームを延伸ブロー成形して得られたボトルである。 Next, the present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a nitrogen-filled polyester resin bottle for a nitrogen-filled hot pack in which a beverage such as a wine beverage is hot-packed with nitrogen-filled content, and is a bottle obtained by stretching and blow molding a polyester resin preform.

図１に示されているようにこの窒素封入ホットパック用ポリエステル樹脂製ボトル１は、ワイン用ガラス壜を模した容器形状とされていて、口部２と、口部２の下部に連接する首部３と、首部３の下部に連接する肩部４と、この肩部４の下部に連接されて略円筒形状に成形されている胴部５と、容器最下部の接地部６と、前記胴部５の下方に位置して胴部５に連接されているとともに、前記接地部６の外周部に連接されていて、胴部５と接地部６との間を繋ぐ胴部傾斜下部７と、接地部６の内周部に連接している凹入底部８とを備えているものである。 As shown in FIG. 1, the nitrogen-filled hot pack polyester resin bottle 1 has a container shape imitating a glass bottle for wine, and has a mouth portion 2 and a neck portion connected to the lower portion of the mouth portion 2. 3, a shoulder portion 4 connected to the lower part of the neck portion 3, a body portion 5 connected to the lower portion of the shoulder portion 4 and formed into a substantially cylindrical shape, a ground contact portion 6 at the bottom of the container, and the body portion. It is located below the body 5 and is connected to the body portion 5, and is connected to the outer peripheral portion of the ground contact portion 6 and is connected to the body portion inclined lower portion 7 connecting between the body portion 5 and the ground contact portion 6 and the ground contact portion 7. It is provided with a recessed bottom portion 8 connected to the inner peripheral portion of the portion 6.

（口部）
容器最上部に位置する口部２の外周には外ねじが設けられており、この口部２にキャップを被せてねじ付けることでボトル内が封止される。口部２と首部３の間にはボトル成形に際して形成されるサポートリング９が一体にして設けられている。 (Mouth)
An external screw is provided on the outer circumference of the mouth portion 2 located at the uppermost portion of the container, and the inside of the bottle is sealed by covering the mouth portion 2 with a cap and screwing. A support ring 9 formed during bottle molding is integrally provided between the mouth portion 2 and the neck portion 3.

（首部）
細長状の首部３の上部はサポートリング９の下方部分となり、ボトル成形や内容物充填に際してこのサポートリング９を保持する図示しない保持具に応じた規定径の被保持部分１０とされていて、口部２の外径とほぼ同じ外径としている。そして首部３は被保持部分１０の下辺から容器外方に向けて拡径した首部拡径部分１１があり、この首部拡径部分１１にサポートリング９より外径を大となるようにした略円筒状の円筒部分１２が連続している。 (Neck)
The upper portion of the elongated neck portion 3 is a lower portion of the support ring 9, and is a held portion 10 having a specified diameter according to a holder (not shown) that holds the support ring 9 during bottle molding or filling of contents. The outer diameter is almost the same as the outer diameter of the part 2. The neck 3 has a neck diameter-expanded portion 11 whose diameter is expanded from the lower side of the held portion 10 toward the outside of the container, and the neck diameter-expanded portion 11 has a substantially cylindrical shape having an outer diameter larger than that of the support ring 9. The cylindrical portion 12 in the shape is continuous.

さらに略円筒状の円筒部分１２については、上記口部２側から肩部４側に向けて漸次大径となる細長の形状に成形され、首部３の内部空間の形状も成形に合わせて口部２側から肩部４側に向けて漸次大径となる形状となっている。 Further, the substantially cylindrical cylindrical portion 12 is formed into an elongated shape in which the diameter gradually increases from the mouth portion 2 side to the shoulder portion 4 side, and the shape of the internal space of the neck portion 3 is also formed in accordance with the molding. The shape gradually increases from the 2 side to the 4 side of the shoulder.

よってこの首部３内での下部側の空間を示す内容物とその内容物の液面上方の空間とのそれぞれの体積の変動があっても、液面が大きく上下に変化することがないように設けられている。 Therefore, even if there is a change in the volume of the content indicating the space on the lower side in the neck 3 and the space above the liquid level of the content, the liquid level does not change significantly up and down. It is provided.

（首部の長さ）
首部３は、ワイン用ガラス壜を模したデザインを強調する上で重要な箇所の一つであり、この首部３の容器高さ方向の長さＬ３が容器高さＨの２０〜３０％の範囲が適している。 (Length of neck)
The neck 3 is one of the important points for emphasizing the design imitating a glass bottle for wine, and the length L3 of the neck 3 in the container height direction is in the range of 20 to 30% of the container height H. Is suitable.

（肩部）
前記肩部４は容器外方に向けて拡径されていて、首部３の外径より大径となって前記胴部５の上部に連続する部分であり、縦断面の形状が容器外方に向けて凸の弧状となる曲面が周方向に亘って形成されている。 (Shoulder)
The shoulder portion 4 has a diameter expanded toward the outside of the container, is a portion having a diameter larger than the outer diameter of the neck portion 3 and is continuous with the upper portion of the body portion 5, and the shape of the vertical cross section is outward of the container. A curved surface having a convex arc shape is formed in the circumferential direction.

（胴部）
胴部５全体が平面形状を略円筒状とされていて、前記肩部４側の胴部５の上辺部分１３と前記胴部傾斜下部７側の下辺部分１４とを、この上辺部分１３と下辺部分１４との間の中間円筒部分１５より外径を若干大としている。中間円筒部分１５は図示しないラベルフィルムを配する箇所であり、上辺部分１３と下辺部分１４とのそれぞれの外径をこの中間円筒部分１５の外径より大寸とすることで、前記ラベルフィルムの不用意な移動を防ぐようにしている。このため前記上辺部分１３と下辺部分１４とは、本ホットパック用ポリエステル樹脂製ボトル１での最大外径部分となる。 (Torso)
The entire body portion 5 has a substantially cylindrical planar shape, and the upper side portion 13 of the body portion 5 on the shoulder portion 4 side and the lower side portion 14 on the body portion inclined lower portion 7 side are formed on the upper side portion 13 and the lower side. The outer diameter is slightly larger than that of the intermediate cylindrical portion 15 between the portion 14. The intermediate cylindrical portion 15 is a place where a label film (not shown) is arranged, and by making the outer diameters of the upper side portion 13 and the lower side portion 14 larger than the outer diameter of the intermediate cylindrical portion 15, the label film I try to prevent inadvertent movement. Therefore, the upper side portion 13 and the lower side portion 14 are the maximum outer diameter portions of the polyester resin bottle 1 for this hot pack.

（胴部傾斜下部）
前記胴部傾斜下部７の上辺部分は、首部３と肩部４との間、肩部４と胴部５との間と同様に曲面部分を介して胴部５に連接しているとともに、この胴部傾斜下部７の下辺部分も接地部６の外周となる部分に曲面部分を介して連接している。 (Lower torso tilt)
The upper side portion of the body portion inclined lower portion 7 is connected to the body portion 5 via a curved surface portion as well as between the neck portion 3 and the shoulder portion 4 and between the shoulder portion 4 and the body portion 5. The lower side portion of the body portion inclined lower portion 7 is also connected to the outer peripheral portion of the ground contact portion 6 via a curved surface portion.

そして図２に示されているように、実施の形態におけるホットパック用ポリエステル樹脂製ボトル１での胴部傾斜下部７はその上辺部分と下辺部分との間の周方向に亘る周面が、容器中心線方向にして容器下方に向けて傾斜した傾斜面１６として形成されていて、外径が容器高さ方向での下方に向けて漸次小径としている。 Then, as shown in FIG. 2, the body portion inclined lower portion 7 of the polyester resin bottle 1 for hot packing according to the embodiment has a container having a peripheral surface extending in the circumferential direction between the upper side portion and the lower side portion. It is formed as an inclined surface 16 that is inclined toward the lower side of the container in the direction of the center line, and the outer diameter is gradually reduced toward the lower side in the height direction of the container.

（接地部）
容器最下部である前記接地部６は平面形状を円環状としていて、このホットパック用ポリエステル樹脂製ボトルを置く平面と接触する箇所は線接触ではなく、容器径方向で接地幅のある面接触する部分とされている。そして接地部６の内周部１８と外周部１７の間隔である接地幅Ｗ６は０．９〜２．５ｍｍの範囲とすることが良好ましい。 (Grounding part)
The ground contact portion 6 at the bottom of the container has an annular planar shape, and the portion that comes into contact with the flat surface on which the polyester resin bottle for hot pack is placed is not in line contact but in contact with a surface having a ground contact width in the container radial direction. It is said to be a part. The grounding width W6, which is the distance between the inner peripheral portion 18 and the outer peripheral portion 17 of the grounding portion 6, is preferably in the range of 0.9 to 2.5 mm.

接地部６の接地幅が前記範囲を超えて広いと、ボトルの内圧が高くなったときに、この接地部６の内周側及び凹入底部８は、容器高さ方向下方に押し出す圧力に対して抗し難くなる。そして凹入底部８が少しながら押し出される方向に変形することで容器全高が高くなり、起立安定性が低下する可能がある。また狭いと、ボトルの接地が不安定となる。 If the ground contact width of the ground contact portion 6 is wider than the above range, when the internal pressure of the bottle becomes high, the inner peripheral side of the ground contact portion 6 and the recessed bottom portion 8 are opposed to the pressure pushed downward in the container height direction. It becomes difficult to resist. Then, the recessed bottom portion 8 is slightly deformed in the pushing direction, so that the total height of the container is increased and the standing stability may be lowered. If it is narrow, the grounding of the bottle becomes unstable.

また、前記接地部６の内周部１８の位置での直径Ｗ１８は、胴部最大外径とされている前記胴部傾斜下部７の直上の胴部外径Ｗ５の６０〜７３％の範囲とすることが好ましい。 Further, the diameter W18 at the position of the inner peripheral portion 18 of the ground contact portion 6 is in the range of 60 to 73% of the body portion outer diameter W5 immediately above the body portion inclined lower portion 7, which is the maximum outer diameter of the body portion. It is preferable to do so.

接地部６の内周部１８の位置での直径Ｗ１８が上記範囲を超えて大きいと、ボトルの起立安定性は良いが、内圧により底形状が変化し易くなる。また一方、直径Ｗ１８が前記範囲を超えて小さいと起立安定性が低下し倒れ易くなり搬送性が悪くなるという可能性がある。 If the diameter W18 at the position of the inner peripheral portion 18 of the ground contact portion 6 is larger than the above range, the standing stability of the bottle is good, but the bottom shape is likely to change due to the internal pressure. On the other hand, if the diameter W18 is smaller than the above range, the standing stability may be lowered and the vehicle may easily fall down, resulting in poor transportability.

（凹入底部）
前記接地部６の内周部１８に連接している凹入底部８は、図２の断面で示されているように容器外周側から、周壁部１９と曲面部２０と底部中央部２１とで容器内方に向けて凹入した形状に形成されている。 (Dent bottom)
The recessed bottom portion 8 connected to the inner peripheral portion 18 of the grounding portion 6 is formed by the peripheral wall portion 19, the curved surface portion 20, and the bottom central portion 21 from the outer peripheral side of the container as shown in the cross section of FIG. It is formed in a concave shape toward the inside of the container.

（周壁部）
前記周壁部１９は接地部６の内周部１８から略垂直に容器高さ方向の上方に向けて立ち上げられていて、本実施の形態において、周壁部１９の容器高さ方向の長さＬ１９が０．５ｍｍとされており、１ｍｍ以下が適している。長さが大きくなると凹入部の凹入高さが大きくなりすぎるという問題がある。 (Peripheral wall)
The peripheral wall portion 19 is raised substantially vertically upward from the inner peripheral portion 18 of the ground contact portion 6 in the container height direction, and in the present embodiment, the length L19 of the peripheral wall portion 19 in the container height direction. Is 0.5 mm, and 1 mm or less is suitable. There is a problem that the recessed height of the recessed portion becomes too large when the length becomes large.

（曲面部）
曲面部２０は周壁部１９の上辺部２２に連接されている。そして凹入底部８の中心側に向けて漸次傾斜して、周壁部１９の部分より容器高さ方向上方に位置にするように配置されている。 (Curved surface)
The curved surface portion 20 is connected to the upper side portion 22 of the peripheral wall portion 19. Then, it is arranged so as to be gradually inclined toward the center side of the recessed bottom portion 8 so as to be positioned above the portion of the peripheral wall portion 19 in the container height direction.

さらに曲面部２０は縦断面形状を平板形状とはせずに、図示されているようにこの周壁部１９の上辺部２２から容器高さ方向の上方に向けて緩やかな凸の弧状を呈するように形成されている。 Further, the curved surface portion 20 does not have a flat cross-sectional shape, but exhibits a gentle convex arc shape from the upper side portion 22 of the peripheral wall portion 19 toward the upper side in the container height direction as shown in the drawing. It is formed.

（底部中央部）
底部中央部２１は前記曲面部２０の内周部２３が連接していてい、この底部中央部２１が凹入底部８全体の中央に位置する。この底部中央部２１は縦断面形状が容器高さ方向の上方に向けて凸のドーム状としている。そして、天頂部分（容器外面側）２４が略平坦にして、曲面部２０の部分より上方の位置となるように形成されている。 (Center of the bottom)
The inner peripheral portion 23 of the curved surface portion 20 is connected to the bottom central portion 21, and the bottom central portion 21 is located at the center of the entire recessed bottom portion 8. The bottom central portion 21 has a dome shape whose vertical cross-sectional shape is convex upward in the container height direction. The zenith portion (outer surface side of the container) 24 is formed to be substantially flat so as to be located above the curved surface portion 20.

このように凹入底部８は全体として容器内方に向けて凹入した形状としている。さらに凹入底部８の外周部分となる前記周壁部１９が接地部６の内周部１８の位置から略垂直にして容器高さ方向の上方に向けて立ち上げられていて、この立ち上げられた周壁部１９に、縦断面略弧状の前記曲面部２０が連接されていることから、容器内圧が高まって曲面部２０を容器下方に向けて押し下げる力が加わることがあっても、その押し下げる力での縦の分力に対して周壁部１９が確実に抗するようになり、よって曲面部２０の容器下方への移動が抑えられる。 In this way, the recessed bottom portion 8 has a shape that is recessed toward the inside of the container as a whole. Further, the peripheral wall portion 19 which is the outer peripheral portion of the recessed bottom portion 8 is raised substantially perpendicular to the position of the inner peripheral portion 18 of the ground contact portion 6 and is raised toward the upper side in the container height direction. Since the curved surface portion 20 having a substantially arc-shaped vertical cross section is connected to the peripheral wall portion 19, even if the internal pressure of the container increases and a force for pushing down the curved surface portion 20 toward the lower side of the container is applied, the pushing force is used. The peripheral wall portion 19 surely resists the vertical component force of the curved surface portion 20, and thus the movement of the curved surface portion 20 downward to the container is suppressed.

そのため、容器内圧が高まって凹入底部８を容器下方に押し下げるようになる時点の場合でも、接地部６の接地幅が前記範囲とされていることと相まって前記周壁部１９で曲面部２０の下方への移動を抑えるので、凹入底部８が容器下方に向けて下がる変形が生じない。 Therefore, even when the pressure inside the container increases and the recessed bottom portion 8 is pushed down below the container, the ground contact width of the ground contact portion 6 is within the above range, and the peripheral wall portion 19 is below the curved surface portion 20. Since the movement to the container is suppressed, the recessed bottom portion 8 is not deformed to be lowered toward the lower side of the container.

接地部６の接地面から底部中央部２１の平坦な頂部（天頂部分２４）における容器高さ方向の凹入底部の高さＨ２１は、接地部６の内周部１８の直径Ｗ１８の２０〜３０％の範囲とされていることが好ましい。 The height H21 of the recessed bottom portion in the container height direction from the ground contact surface of the ground contact portion 6 to the flat top portion (zenith portion 24) of the bottom center portion 21 is 20 to 30 of the diameter W18 of the inner peripheral portion 18 of the ground contact portion 6. It is preferably in the range of%.

接地部６の接地面から底部中央部２１の平坦な頂部（天頂部分２４）における容器高さ方向の高さＨ２１が前記範囲を超えて小さいと耐圧強度が低くなり、内圧が高まると内圧により容器外方に向けて変形し易くなる。また平坦頂部の高さが前記範囲を超えて大きくなると、内容量が不足する可能性がある。 If the height H21 in the container height direction from the grounding surface of the grounding portion 6 to the flat top (zenith portion 24) of the bottom central portion 21 is smaller than the above range, the pressure resistance strength becomes low, and if the internal pressure increases, the container is affected by the internal pressure. It becomes easy to deform toward the outside. Further, if the height of the flat top exceeds the above range, the internal capacity may be insufficient.

（窒素ガス封入ホットパック充填方法）
図３は前記窒素封入ホットパック用ポリエステル樹脂製ボトル１にホットパック用内容物が加温充填され、窒素ガスが封入された窒素ガス封入ホットパック用内容物充填ポリエステル樹脂製ボトル２５を示している。この窒素ガス封入ホットパック用内容物充填ポリエステル樹脂製ボトル２５としては、例えば、ワイン飲料などのホットパック飲料が充填済みとなって飲料メーカーでの保存段階やメーカーから出荷されて一般小売店舗などでの保存段階にあるボトルである。 (Nitrogen gas filled hot pack filling method)
FIG. 3 shows a nitrogen gas-filled hot pack content-filled polyester resin bottle 25 in which the nitrogen-filled hot-pack polyester resin bottle 1 is heated and filled with the contents for the hot pack and filled with nitrogen gas. .. The content-filled polyester resin bottle 25 for a nitrogen gas-filled hot pack includes, for example, a hot-packed beverage such as a wine beverage that has been filled and stored at a beverage maker or shipped from the maker at a general retail store. It is a bottle in the storage stage of.

この窒素ガス封入ホットパック用内容物充填ポリエステル樹脂製ボトル２５の、細長の首部３の内容物の液面の上方のヘッドスペース２７は、充填直後から、窒素ガス量、内容物の温度変化による体積変化、内容物中への窒素の溶解などにより、体積は変動し液面も変動する。 The head space 27 above the liquid level of the contents of the elongated neck 3 of the content-filled polyester resin bottle 25 filled with nitrogen gas is the volume due to the amount of nitrogen gas and the temperature change of the contents immediately after filling. Due to changes, dissolution of nitrogen in the contents, etc., the volume fluctuates and the liquid level also fluctuates.

本ボトル２５のホットパック内容物がワイン飲料の場合に限られるものではないが、内容物の液面の高さが下がりすぎると、商品として一般消費者には見た目が好まれないものとなってしまうため、液面低下の少ないヘッドスペースを確保することが望ましく、液体窒素滴下充填においては、容器の形状変動が少なく抑制するような容器形状が求められ、また、容器形状に影響を与えないような充填条件を適切に設定することが望まれる。 The contents of the hot pack of this bottle 25 are not limited to wine beverages, but if the liquid level of the contents drops too low, the appearance of the product becomes unfavorable to general consumers. Therefore, it is desirable to secure a head space with less liquid level drop, and in liquid nitrogen dropping filling, a container shape that suppresses the shape fluctuation of the container is required so as not to affect the container shape. It is desirable to appropriately set various filling conditions.

本実施の形態である窒素ガス封入ホットパック内容物充填ポリエステル樹脂製ボトル２５にあっては、充填直後のヘッドスペース２７の体積が、ボトル内容積の２〜６％の範囲となるように窒素封入充填することが適している。この範囲とすることで、窒素封入充填直後の高圧、及び、その後の冷却による内容物の体積収縮による減圧によって本発明の前記ボトルが変形することを適切に抑え、消費者に好まれないヘッドスペース液面（入り身線）低下を減少することができる。 In the nitrogen gas-filled hot pack content-filled polyester resin bottle 25 of the present embodiment, nitrogen is filled so that the volume of the head space 27 immediately after filling is in the range of 2 to 6% of the internal volume of the bottle. Suitable for filling. By setting this range, it is possible to appropriately suppress the deformation of the bottle of the present invention due to the high pressure immediately after filling with nitrogen and the reduced pressure due to the volume shrinkage of the contents due to the subsequent cooling, and the head space is not preferred by consumers. It is possible to reduce the decrease in liquid level (entrance line).

ヘッドスペース２７の体積が、前記の数値範囲を超えて小さい場合、窒素ガス封入ホットパック内容物充填ポリエステル樹脂製ボトル２５の充填直後の内圧が高くなりすぎ、また、ヘッドスペース２７の体積が、前記の数値範囲を超えて大きすぎると、液面が下がりすぎてしまい、消費者に好まれないほどに液面が下がることが懸念される。 When the volume of the head space 27 is smaller than the above numerical range, the internal pressure immediately after filling the nitrogen gas-filled hot pack content-filled polyester resin bottle 25 becomes too high, and the volume of the head space 27 becomes the above-mentioned. If it is too large beyond the numerical range of, the liquid level will drop too much, and there is a concern that the liquid level will drop to the extent that consumers do not like it.

なお、本発明の窒素封入ホットパック用ポリエステル樹脂製ボトル１は、充填する内容物の酸化を防止するために、所望により公知のアクティブ酸素バリア剤、パッシーブ酸素バリア剤などを、単層又は多層で適宜用いることができる。また、酸素などのガスバリア性を高めるために容器内面或いは外面にダイヤモンドライクカーボンコート、シリカコートなど公知のプラズマコートを施して使用することができる。 In addition, in the polyester resin bottle 1 for a nitrogen-filled hot pack of the present invention, in order to prevent oxidation of the contents to be filled, a known active oxygen barrier agent, passive oxygen barrier agent, etc., if desired, may be added in a single layer or in multiple layers. It can be used as appropriate. Further, in order to enhance the gas barrier property of oxygen or the like, a known plasma coat such as a diamond-like carbon coat or a silica coat can be applied to the inner surface or the outer surface of the container for use.

１…窒素封入ホットパック用ポリエステル樹脂製ボトル
３…首部
６…接地部
７…胴部傾斜下部
８…凹入底部
１６…胴部傾斜下部の傾斜面
１７…接地部の外周部
１８…接地部の内周部
１９…周壁部
２０…曲面部
２１…底部中央部
２４…底部中央部の天頂部分
２５…窒素ガス封入ホットパック内容物充填ポリエステル樹脂製ボトル
２６…キャップ
２７…ヘッドスペース
Ｌ３…首部の長さ
Ｈ…容器高さ
Ｈ２１…天頂部分の容器高さ方向での高さ
Ｌ１９…周壁部の容器高さ方向での長さ
Ｗ５…胴部外径
Ｗ６…接地幅
Ｗ１７…接地部の外周部の位置での直径
Ｗ１８…接地部の内周部の位置での直径 1 ... Polyester resin bottle for nitrogen-filled hot pack 3 ... Neck 6 ... Grounding part 7 ... Body inclined lower part 8 ... Recessed bottom 16 ... Inclined surface of body inclined lower part 17 ... Outer part of grounding part 18 ... Grounding part Inner circumference 19 ... Peripheral wall 20 ... Curved surface 21 ... Bottom center 24 ... Bottom center zenith 25 ... Nitrogen gas-filled hot pack Contents-filled polyester resin bottle 26 ... Cap 27 ... Headspace L3 ... Neck length H ... Container height H21 ... Height of the zenith in the container height direction L19 ... Length of the peripheral wall in the container height direction W5 ... Body outer diameter W6 ... Grounding width W17 ... Outer peripheral part of the grounding part Diameter at position W18 ... Diameter at the position of the inner peripheral part of the ground contact part

Claims

The mouth, the neck connected to the lower part of the mouth, the shoulder connected to the lower part of the neck and expanded toward the outside of the container to have a larger diameter than the outer diameter of the neck, and the shoulder. A body portion that is connected to the lower part of the portion and has a substantially cylindrical shape, a ground contact portion that has an annular shape in a plane shape, and a ground contact portion that is located below the body portion and is connected to the body portion and has an outer diameter. Is a nitrogen-filled hot pack polyester having a body portion inclined lower portion connected to the ground contact portion and a recessed bottom portion connected to the inner peripheral portion of the ground contact portion, which gradually becomes smaller in diameter downward in the container height direction. In a resin bottle
The recessed bottom portion is connected to a peripheral wall portion that rises substantially vertically upward from the inner peripheral portion of the ground contact portion in the container height direction and an upper side portion of the peripheral wall portion, and has a vertical cross-sectional shape. It has a convex arc shape from the upper side of the peripheral wall toward the upper side in the container height direction, and is gradually inclined toward the center side of the recessed bottom, and is formed at a position above the peripheral wall in the container height direction. The curved surface portion is connected to the inner peripheral portion of the curved surface portion and is located at the center of the recessed bottom portion, the zenith portion is made substantially flat, and is formed at a position above the curved surface portion in the container height direction. A polyester resin bottle for nitrogen-filled hot packs, which consists of a central part of the bottom and has a concave shape that is recessed toward the inside of the container.

According to claim 1, the diameter of the inner peripheral portion of the annular ground contact portion is in the range of 60 to 73% of the outer diameter of the body portion directly above the lower portion of the inclined portion of the body portion, which is the maximum outer diameter of the body portion. The polyester resin bottle for the nitrogen-filled hot pack described.

Claim 1 or 2 in which the height of the ground contact portion at the flat top of the recessed bottom portion in the container height direction from the ground contact surface is in the range of 20 to 30% of the diameter of the inner peripheral portion of the ground contact portion. The polyester resin bottle for a nitrogen-filled hot pack according to any one of the above items.

The polyester for a nitrogen-filled hot pack according to any one of claims 1 to 3, wherein the ground contact width, which is the distance between the inner circumference and the outer circumference of the annular ground contact portion, is in the range of 0.9 to 2.5 mm. Resin bottle.

The neck portion has an elongated shape in which the length in the container height direction is in the range of 20 to 30% of the container height, and the elongated neck portion has an outer diameter larger than the outer diameter of the mouth portion. The polyester resin bottle for a nitrogen-filled hot pack according to any one of claims 1 to 4, which has a shape in which the diameter gradually increases from the mouth side to the shoulder side.

A method for filling a nitrogen-filled polyester resin bottle for a hot-pack according to any one of claims 1 to 5 with nitrogen-filled contents heated to 40 to 60 ° C. The head space of the filling container immediately after filling and sealing the mouth after dropping and injecting the heated contents and liquid nitrogen is 2 to 6% of the internal volume of the bottle, and the internal pressure of the head space is 60 to 150 kPa. A nitrogen-filled filling method for hot pack contents, which comprises filling and sealing with pressure.