JP2803878B2 - Composite container and method for producing the same - Google Patents
Composite container and method for producing the sameInfo
- Publication number
- JP2803878B2 JP2803878B2 JP204690A JP204690A JP2803878B2 JP 2803878 B2 JP2803878 B2 JP 2803878B2 JP 204690 A JP204690 A JP 204690A JP 204690 A JP204690 A JP 204690A JP 2803878 B2 JP2803878 B2 JP 2803878B2
- Authority
- JP
- Japan
- Prior art keywords
- container
- thin
- inner container
- composite
- outer container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、レトルト食品等を包装する容器として特に
好適な複合容器およびその製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a composite container particularly suitable as a container for packaging retort foods and the like, and a method for producing the same.
「従来の技術」 内容物を長期保存できる容器として、金属製の缶容器
が広く使用されていた。しかしながら金属缶は内容物に
容器の臭い、いわゆる缶臭さが付く問題がある。"Conventional technology" Metal cans have been widely used as containers that can store contents for a long period of time. However, the metal can has a problem that the contents have a container smell, so-called can smell.
本発明者らは、前記問題を解決でき、しかも安全性、
意匠の自由度等の点でも優れている複合容器を先に提案
した（例えば、特開昭60-90130号公報、特開昭60-90131
号公報、特開昭61-203335号公報参照）。The present inventors can solve the above-mentioned problems, and furthermore, safety,
A composite container that is also excellent in terms of design freedom and the like has been previously proposed (for example, JP-A-60-90130, JP-A-60-90131).
JP-A-61-203335).
この複合容器は、第３図に示すように、外容器１とそ
の内面に配設されて薄肉内容器２とからなるものであ
る。外容器１は剛性を有するもので、プラスチックによ
って形成されている。薄肉内容器２はガスバリア性を有
する金属箔の両面にプラスチックフィルムが積層された
複合フィルムによって形成されている。この複合容器の
製造は、まず前記複合フィルムをカップ状に賦形して薄
肉内容器２としたあと、この薄肉内容器２を射出成形用
金型内にインサートし、ついで金型内に樹脂を注入して
外容器１を成形する方法により行なわれていた。そして
このように製造された従来の複合容器は、薄肉内容器２
と外容器１とが全面で融着された状態となっていた。As shown in FIG. 3, the composite container comprises an outer container 1 and a thin inner container 2 disposed on the inner surface thereof. The outer container 1 has rigidity and is made of plastic. The thin inner container 2 is formed of a composite film in which a plastic film is laminated on both surfaces of a metal foil having gas barrier properties. In the production of this composite container, the composite film is first shaped into a cup to form a thin-walled inner container 2, and then the thin-walled inner container 2 is inserted into an injection molding die, and then the resin is poured into the die. It has been performed by a method of molding the outer container 1 by pouring. And the conventional composite container manufactured in this manner is a thin inner container 2.
And the outer container 1 were fused on the entire surface.
「発明が解決しようとする課題」 前記従来の複合容器は前述の如くインサート成形法に
よって製造されていたが、インサート成形法は生産速度
を速めることが難しく、製造コスト低減の障害となって
いる不満があった。"Problems to be Solved by the Invention" Although the conventional composite container is manufactured by the insert molding method as described above, it is difficult to increase the production speed by the insert molding method, which is a hindrance to reducing the manufacturing cost. was there.
先に本発明者らはこの問題に対処するため、外容器１
と薄肉内容器２とを別々に成形し、これらを後で溶着一
体化する製造方法を検討した。First, the present inventors addressed the problem by using an outer container 1.
And a thin inner container 2 were separately formed, and a manufacturing method of welding and integrating them later was studied.
ところがこのような製造方法でインサート成形法と同
様に外容器１と薄肉内容器２とを全面接着することは非
常に困難であった。そして、外容器１と薄肉内容器２と
を完全に全面接着できなかった場合には、レトルト殺菌
処理を行ったときに未接着部分に残留した空気の膨張に
起因して、薄肉内容器２が盛り上がったり、外容器１と
薄肉内容器２との間が剥離したり、また薄肉内容器２を
なす複合フィルムのプラスチックフィルムと金属箔が剥
離したりする問題が発生した。However, it is very difficult to bond the entire outer container 1 and the thin-walled inner container 2 with the manufacturing method like the insert molding method. When the entire outer container 1 and the thin-walled inner container 2 cannot be completely adhered to each other, the thin-walled inner container 2 becomes unsealable due to the expansion of air remaining in the unbonded portion when the retort sterilization process is performed. There were problems such as swelling, peeling between the outer container 1 and the thin inner container 2, and peeling of the plastic film and metal foil of the composite film forming the thin inner container 2.
本発明は前記事情に鑑みてなされたもので、安価に製
造できるうえ、レトルト殺菌処理時に容器の変形や剥離
等の問題を生じることのない複合容器およびその製造方
法を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composite container which can be manufactured at low cost and does not cause problems such as deformation and peeling of the container during retort sterilization and a method for manufacturing the same. .
「課題を解決するための手段」 本発明の複合容器は、薄肉内容器の少なくとも外周縁
部分を全周に渡って気密な状態で外容器に固定すると共
に、薄肉内容器と外容器との間の空間を減圧状態とした
ものである。"Means for Solving the Problems" The composite container of the present invention is characterized in that at least the outer peripheral edge portion of the thin-walled inner container is fixed to the outer container in an airtight state over the entire circumference, and the distance between the thin-walled inner container and the outer container is increased. Is in a reduced pressure state.
ここで薄肉内容器と外容器との間の空間が減圧状態と
は、後述するように薄肉内容器が大気圧によって外容器
側に押圧される前の状態で大気圧以下であることを意味
する。Here, the space between the thin-walled inner container and the outer container is in a depressurized state, which means that the space before the thin-walled inner container is pressed to the outer container side by the atmospheric pressure is equal to or lower than the atmospheric pressure as described later. .
また本発明の複合容器の製造方法は、外容器内に薄肉
内容器を配置したあと、この薄肉内容器の少なくとも外
周縁部分全周を、減圧下で、外容器に気密に固定する方
法である。Further, the method for producing a composite container of the present invention is a method in which after arranging a thin-walled inner container in an outer container, at least the entire outer peripheral edge portion of the thin-walled inner container is air-tightly fixed to the outer container under reduced pressure. .
「作用」 本発明の複合容器では、薄肉内容器と外容器との間を
減圧状態にしたので、薄肉内容器が大気圧によって外容
器内面に密着するように押し付けられる。薄肉内容器
は、その外周縁部分が全周に渡って外容器と気密に固定
されているので、薄肉内容器と外容器との間の減圧状態
が維持される。[Operation] In the composite container of the present invention, since the pressure between the thin inner container and the outer container is reduced, the thin inner container is pressed against the inner surface of the outer container by atmospheric pressure. Since the outer peripheral edge portion of the thin-walled inner container is hermetically fixed to the outer container over the entire circumference, the reduced-pressure state between the thin-walled inner container and the outer container is maintained.
また本発明の製造方法では、減圧下で外容器と薄肉内
容器の溶着を行うので、外容器と内容器との間の間隙
が、自ずと減圧状態となる。In the manufacturing method of the present invention, since the outer container and the thin inner container are welded under reduced pressure, the gap between the outer container and the inner container is naturally reduced in pressure.
「実施例」 以下、図面を参照して本発明の複合容器およびその製
造方法を詳しく説明する。Example Hereinafter, a composite container of the present invention and a method for producing the same will be described in detail with reference to the drawings.
第１図は本発明の複合容器の一実施例を示すものであ
る。この複合容器は、外容器10と薄肉内容器20とによっ
て構成されている。外容器10はポリプロピレンを射出成
形することによって製造された剛性を有するもので、浅
い皿状に形成されている。この外容器10の開口側上端縁
には外方に延びるフランジ11が設けられている。FIG. 1 shows an embodiment of the composite container of the present invention. The composite container includes an outer container 10 and a thin inner container 20. The outer container 10 has rigidity manufactured by injection-molding polypropylene, and is formed in a shallow dish shape. An outwardly extending flange 11 is provided at the upper edge of the outer container 10 on the opening side.
薄肉内容器20は、ガスバリヤ性を有するアルミニウム
箔の表裏両面にポリプロピレン製フィルムが積層されれ
なる複合フィルムを浅い皿状に成形したもので、外容器
10内に緩く嵌まる大きさに形成されている。この薄肉内
容器20の開口側上端縁にも外方に延びるフランジ21が形
成されている。The thin inner container 20 is formed by molding a composite film in which a polypropylene film is laminated on both sides of an aluminum foil having gas barrier properties into a shallow dish shape.
It is formed in a size that fits loosely into the inside. An outwardly extending flange 21 is also formed at the upper edge of the thin inner container 20 on the opening side.
これら薄肉内容器20と外容器10とは、フランジ21,11
の部分で全周に渡って重ね合わされており、この重なり
合った部分30で互いに気密に溶着されている。そしてこ
れら薄肉内容器20と外容器10との間の間隙は、薄肉内容
器20が大気圧により外容器10の内面に押し付けられる前
の状態で、600mmHgの減圧状態とされている。These thin inner container 20 and outer container 10 are connected to flanges 21 and 11
Are overlapped over the entire circumference, and the overlapped portions 30 are welded to each other in an airtight manner. The gap between the thin-walled inner container 20 and the outer container 10 is reduced to 600 mmHg before the thin-walled inner container 20 is pressed against the inner surface of the outer container 10 by the atmospheric pressure.
この複合容器を製造するには、まずポリプロピレンを
射出成形して外容器10を製造する。またこれとは別に複
合フィルムをプレス成形法等により賦形して薄肉内容器
20を製造する。次に第２図に示すように、これら外容器
10と薄肉内容器20をフランジ11,21が重なり合うように
組み合わせて、減圧装置内に収める。ついで減圧装置内
を100mmHg以上排気して、装置内の圧力を600mmHg以下と
し、この状態で外容器10のフランジ11と薄肉内容器20の
フランジ21を全周に渡って溶着する。この溶着は、溶着
部分を空気が流通し得ない状態となるように行なわれ
る。In order to manufacture this composite container, first, polypropylene is injection-molded to manufacture the outer container 10. Separately, the composite film is shaped by press molding, etc.
Manufacture 20. Next, as shown in FIG.
The thin inner container 20 and the thin inner container 20 are combined so that the flanges 11 and 21 overlap with each other, and are housed in the pressure reducing device. Next, the inside of the decompression device is evacuated to 100 mmHg or more, and the pressure in the device is set to 600 mmHg or less. In this state, the flange 11 of the outer container 10 and the flange 21 of the thin-walled inner container 20 are welded over the entire circumference. This welding is performed so that air cannot flow through the welded portion.
このように溶着された外容器10と薄肉内容器20との間
には、若干のすき間Ａが存在するが、このものを減圧装
置から出すと、大気圧によって薄肉内容器20が外容器10
の内面に押し付けられて第１図に示すように、外容器10
と薄肉内容器20とが密着一体化される。There is a slight gap A between the outer container 10 thus welded and the thin-walled inner container 20. When this is removed from the decompression device, the thin-walled inner container 20 is removed by the atmospheric pressure.
The outer container 10 is pressed against the inner surface of the outer container 10 as shown in FIG.
And the thin inner container 20 are tightly integrated.
この複合容器では、薄肉内容器20のフランジ21が全周
に渡って気密な状態で外容器10に溶着されると共に、薄
肉内容器20と外容器10との間の空間が減圧状態とされて
いるので、外容器10と薄肉内容器20とを全面接着しなく
ても、薄肉内容器20が大気圧によって外容器10の内面に
密着するように押し付けられて一体化される。従ってこ
の複合容器は、外容器10と薄肉内容器20とを別々に成形
して後から組み合わせることによって製造できる生産効
率が良いものとなる。In this composite container, the flange 21 of the thin inner container 20 is welded to the outer container 10 in an airtight state over the entire circumference, and the space between the thin inner container 20 and the outer container 10 is decompressed. Since the outer container 10 and the thin inner container 20 are not bonded to each other, the thin inner container 20 is pressed against the inner surface of the outer container 10 by the atmospheric pressure so as to be integrated with each other. Accordingly, this composite container has a high production efficiency that can be manufactured by separately forming the outer container 10 and the thin-walled inner container 20 and combining them later.
またこの複合容器では、フランジ21,11の部分で全周
に渡って薄肉内容器20と外容器10とが気密に溶着されて
いるので、薄肉内容器20と外容器10との間の減圧状態が
確実に維持される。従ってこの複合容器は、剛性を有す
る外容器10の内面に薄肉の薄肉内容器20が大気圧によっ
て圧接された状態を長期間維持できる保形性の良い容器
となる。Further, in this composite container, since the thin inner container 20 and the outer container 10 are hermetically welded over the entire circumference at the flanges 21 and 11, the depressurized state between the thin inner container 20 and the outer container 10 is reduced. Is reliably maintained. Therefore, this composite container is a container having good shape retention that can maintain a state in which the thin inner container 20 is pressed against the inner surface of the rigid outer container 10 by the atmospheric pressure for a long time.
さらにこの複合容器では、外容器10と薄肉内容器20と
の間の空間が600mmHg以下の減圧状態とされているの
で、レトルト処理に供されたときに薄肉内容器20の初期
の形状（成形時の形状）が損なわれるほど、外容器10・
薄肉内容器20間に在留する空気が膨張することはない。
また同様の理由によって、薄肉内容器20をなす複合フィ
ルムの金属箔とプラスチックフィルムとの間が剥離する
こともない。よってこの複合容器によれば、レトルト処
理が供されても薄肉内容器20の変形や剥離等のトラブル
を回避することができる。Further, in this composite container, since the space between the outer container 10 and the thin inner container 20 is in a decompressed state of 600 mmHg or less, the initial shape of the thin inner container 20 when subjected to the retort treatment (at the time of molding). The outer container 10
The air remaining between the thin inner containers 20 does not expand.
For the same reason, the metal foil of the composite film constituting the thin inner container 20 and the plastic film do not peel off. Therefore, according to this composite container, troubles such as deformation and peeling of the thin inner container 20 can be avoided even when the retort treatment is performed.
加えて前記製造方法によれば、薄肉内容器20と外容器
10とを減圧下で溶着することにより複合容器を製造する
ので、薄肉内容器20と外容器10との間の間隙が自ずと減
圧状態となる。よってこの製造方法によれば、外容器10
と薄肉内容器20との間の減圧状態の複合容器を効率良く
製造できる。In addition, according to the manufacturing method, the thin inner container 20 and the outer container
Since the composite container is manufactured by welding under pressure reduction, the gap between the thin inner container 20 and the outer container 10 is naturally reduced in pressure. Therefore, according to this manufacturing method, the outer container 10
A reduced pressure composite container between the inner container 20 and the thin inner container 20 can be efficiently manufactured.
「発明の効果」 以上説明したように本発明の複合容器は、薄肉内容器
の少なくとも外周縁部分を全周に渡って気密な状態で外
容器に固定すると共に、薄肉内容器と外容器との間の空
間を減圧状態としたものなので、外容器と薄肉内容器と
を全面接着しなくても、薄肉内容器が大気圧によって外
容器の内面に密着するように押し付けられて一体化され
る。従って本発明の複合容器は、外容器と薄肉内容器と
を別々に成形して後から組み合わせることによって製造
できる生産効率の良いものとなる。"Effects of the Invention" As described above, the composite container of the present invention is such that at least the outer peripheral portion of the thin inner container is fixed to the outer container in an airtight state over the entire circumference, and the thin inner container and the outer container are Since the space between them is in a depressurized state, the thin inner container is pressed by the atmospheric pressure so as to be in close contact with the inner surface of the outer container, and is integrated, without the entire outer container and the thin inner container being bonded to each other. Therefore, the composite container of the present invention has a high production efficiency that can be manufactured by separately forming the outer container and the thin-walled inner container and combining them later.
また本発明の複合容器では、薄肉内容器の外周縁部分
が全周に渡って外容器に気密に固定されているので、薄
肉内容器と外容器との間の減圧状態が確実に維持され
る。従って本発明の複合容器は、剛性を有する外容器の
内面に薄肉の内容器が大気圧によって圧接された状態を
長期間維持できる保形性の良い容器となる。Further, in the composite container of the present invention, since the outer peripheral portion of the thin inner container is air-tightly fixed to the outer container over the entire circumference, the depressurized state between the thin inner container and the outer container is reliably maintained. . Therefore, the composite container of the present invention is a container having good shape retention that can maintain a state in which a thin inner container is pressed against the inner surface of a rigid outer container by the atmospheric pressure for a long time.
さらに本発明の複合容器では、外容器と薄肉内容器と
の間の空間が減圧状態とされているので、レトルト処理
に供されたとき外容器と薄肉内容器との間に存在する空
気が膨張しても、薄肉内容器の初期の形状（成形時の形
状）が損なわれることがない。また同様の理由によっ
て、薄肉内容器をなす複合フィルムの金属箔とプラスチ
ックフィルムとの間や薄肉内容器と外容器と固定部が剥
離することもない。よって本発明の複合容器は、レトル
ト処理される食品の包装に好適なものとなる。Furthermore, in the composite container of the present invention, since the space between the outer container and the thin inner container is in a reduced pressure state, the air existing between the outer container and the thin inner container when subjected to the retort treatment expands. However, the initial shape (shape at the time of molding) of the thin inner container is not impaired. For the same reason, there is no separation between the metal foil and the plastic film of the composite film forming the thin-walled inner container, or between the thin-walled inner container, the outer container and the fixing portion. Therefore, the composite container of the present invention is suitable for packaging food to be retorted.
加えて請求項２の製造方法では、外容器内に薄肉内容
器を配置したあと、この薄肉内容器の少なくとも外周縁
部分全周を、減圧下で、外容器に気密に固定する方法な
ので、薄肉内容器と外容器との間の間隙が自ずと減圧状
態となる。よって本発明の製造方法によれば、請求項１
の複合容器を効率良く製造できる。In addition, according to the manufacturing method of the second aspect, after the thin inner container is disposed in the outer container, at least the entire outer periphery of the thin inner container is air-tightly fixed to the outer container under reduced pressure. The gap between the inner container and the outer container is naturally reduced in pressure. Therefore, according to the manufacturing method of the present invention, claim 1
Can be efficiently manufactured.
第１図は本発明の複合容器の一実施例を示す断面図、第
２図は同実施例の複合容器を製造する際の１工程を示す
断面図、第３図は従来の複合容器を示す断面図である。 10……外容器、11……フランジ、20……薄肉内容器、21
……フランジ、30……重なり合った部分。FIG. 1 is a cross-sectional view showing one embodiment of the composite container of the present invention, FIG. 2 is a cross-sectional view showing one step in manufacturing the composite container of the embodiment, and FIG. 3 shows a conventional composite container. It is sectional drawing. 10 ... outer container, 11 ... flange, 20 ... thin-walled inner container, 21
…… Flange, 30 …… Overlapping part.
フロントページの続き (72)発明者 四ッ柳 淳二 神奈川県川崎市川崎区千鳥町３―２ 昭 和電工株式会社川崎樹脂研究所内 (56)参考文献 特開 昭51−107376（ＪＰ，Ａ) 特開 昭64−58665（ＪＰ，Ａ) 実開 昭62−125767（ＪＰ，Ｕ) 実開 昭56−138017（ＪＰ，Ｕ) 実開 昭62−65912（ＪＰ，Ｕ) 実公 昭38−19996（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) B65D 8/00 - 8/22 B65D 25/14 - 25/18 B32B 15/08Continuation of front page (72) Inventor Junji Yotsuyanagi 3-2 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Electric Works Co., Ltd. Kawasaki Resin Laboratory (56) References JP-A-51-107376 (JP, A) 1986-58665 (JP, A) 1987-125767 (JP, U) 1988-138017 (JP, U) 1987-65912 (JP, U) Jiko 38-19996 JP, Y1) (58) Field surveyed (Int. Cl. 6 , DB name) B65D 8/00-8/22 B65D 25/14-25/18 B32B 15/08
Claims (2)
にガスバリア性を有する金属箔からなる薄肉内容器が配
設された複合容器において、 前記薄肉内容器の少なくとも外周縁部分を全周に渡って
気密な状態で外容器に固定すると共に、薄肉内容器と外
容器との間の空間を減圧状態としたことを特徴とする複
合容器。1. A composite container in which a thin inner container made of metal foil having gas barrier properties is disposed on the inner surface of a rigid plastic outer container, wherein at least the outer peripheral edge portion of the thin inner container is provided over the entire circumference. A composite container which is fixed to an outer container in an airtight state, and wherein a space between the thin-walled inner container and the outer container is depressurized.
スバリア性を有する金属箔からなる薄肉内容器を配置し
たあと、この薄肉内容器の少なくとも外周縁部分全周
を、減圧下で、外容器に気密に固定することを特徴とす
る複合容器の製造方法。2. A thin-walled inner container made of a metal foil having gas barrier properties is disposed in a rigid plastic outer container, and at least the entire outer peripheral edge portion of the thin-walled inner container is moved to the outer container under reduced pressure. A method for producing a composite container, wherein the container is air-tightly fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP204690A JP2803878B2 (en) | 1990-01-09 | 1990-01-09 | Composite container and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP204690A JP2803878B2 (en) | 1990-01-09 | 1990-01-09 | Composite container and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03212345A JPH03212345A (en) | 1991-09-17 |
| JP2803878B2 true JP2803878B2 (en) | 1998-09-24 |
Family
ID=11518388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP204690A Expired - Lifetime JP2803878B2 (en) | 1990-01-09 | 1990-01-09 | Composite container and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2803878B2 (en) |
-
1990
- 1990-01-09 JP JP204690A patent/JP2803878B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03212345A (en) | 1991-09-17 |
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