JPH10296845A - Manufacture of deoxidation type multi-layer container - Google Patents

Manufacture of deoxidation type multi-layer container

Info

Publication number
JPH10296845A
JPH10296845A JP10577597A JP10577597A JPH10296845A JP H10296845 A JPH10296845 A JP H10296845A JP 10577597 A JP10577597 A JP 10577597A JP 10577597 A JP10577597 A JP 10577597A JP H10296845 A JPH10296845 A JP H10296845A
Authority
JP
Japan
Prior art keywords
container
flange
oxygen
layer
multilayer
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.)
Granted
Application number
JP10577597A
Other languages
Japanese (ja)
Other versions
JP3838289B2 (en
Inventor
Ryoji Otaki
良二 大滝
Takashi Kashiba
隆史 加柴
Yoshiki Ito
芳樹 伊東
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Gas Chemical Co Inc
Original Assignee
Mitsubishi Gas Chemical Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Gas Chemical Co Inc filed Critical Mitsubishi Gas Chemical Co Inc
Priority to JP10577597A priority Critical patent/JP3838289B2/en
Publication of JPH10296845A publication Critical patent/JPH10296845A/en
Application granted granted Critical
Publication of JP3838289B2 publication Critical patent/JP3838289B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Packages (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce the exposure of an oxygen absorbing resin layer, and reduce rest on the cut surface of a flange outer peripheral edge by a method wherein a deoxidation type multi-layer sheet is formed by dies for container molding wherein on the rim of a flange forming part, a protruding part is provided, and at the same time, the multi-layer sheet is crushed by the protruding part, and a thinner part which is formed on the rim of the flange part, is cut off. SOLUTION: Dies comprise an upper die 2 having a plug 1 and a lower die 4, and a flange forming part 2a to form a flange 11a is provided on the upper die 2, and a protruding part 3 is provided on the rim of the flange forming part 2a. By forming a deoxidation type multi-layer sheet 8 by the dies 2, 4 for container molding, at the same time when a container is molded, a thinner part 9 is formed on the rim of the flange 11a by crushing the multi- layer sheet 8 by the protruding part 3, and the thinner part 9 is cut off. Also, if a space between the protruding part 3 and a flat surface part 6 of the lower die 4 when the upper die 2 and the lower die 4 approach most, is made 70% or lower of the thickness of the deoxidation type multi-layer sheet 8, the layer thickness of the oxygen absorbing resin layer 2 which is exposed on the cut surface of the flange 11a is drastically reduced.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、脱酸素性多層シー
トを真空成形してフランジ付き脱酸素性多層容器を製造
する方法に関し、特に、フランジの外周縁を改良した脱
酸素性多層容器を得るための製造方法に関する。詳しく
は、フランジの外周縁の切断面に露出する酸素吸収樹脂
層の層厚を大幅に減少させた脱酸素性多層容器を得るた
めの製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a deoxygenated multilayer container having a flange by vacuum forming a deoxygenated multilayer sheet, and more particularly to a deoxygenated multilayer container having an improved outer peripheral edge of a flange. For a manufacturing method. More specifically, the present invention relates to a production method for obtaining a deoxidized multilayer container in which the thickness of an oxygen-absorbing resin layer exposed on a cut surface of an outer peripheral edge of a flange is significantly reduced.

【0002】[0002]

【従来の技術】近年、物品の酸化腐食を防止する包装体
として、脱酸素性能を備えた包装材料で包装体を構成す
ることが考えられ、容器自体に脱酸素性能を備えた包装
容器が開発されている。このうち、粉末または粒状の金
属鉄を主成分とする脱酸素剤組成物を配合してなる酸素
吸収樹脂層を中間層とした脱酸素性多層容器は、現在、
無菌炊飯米等の包装容器として使用されている。この容
器は、通常、酸素吸収樹脂層が中間層となるように共押
出しにて製造された脱酸素性多層シートを真空成形する
ことによって製造される。
2. Description of the Related Art In recent years, as a package for preventing oxidative corrosion of articles, it has been considered that the package is made of a packaging material having a deoxidizing property, and a packaging container having a deoxidizing property in a container itself has been developed. Have been. Of these, the oxygen-absorbing multilayer container having an oxygen-absorbing resin layer formed by mixing a deoxidizer composition containing powdered or granular metallic iron as a main component is currently in use.
It is used as a packaging container for aseptic cooked rice. This container is usually manufactured by vacuum forming a deoxidized multilayer sheet manufactured by coextrusion so that the oxygen absorbing resin layer becomes an intermediate layer.

【0003】[0003]

【発明が解決しようとする課題】通常、真空成形法によ
り、熱可塑性シートから容器を製造する手順としては、
熱可塑性シートをヒーター等により加熱、軟化させた
後、その熱可塑性シートと金型の間を真空にしてシート
と金型を密着させて成形し、これを冷却した後、所定の
容器形状にトリミングする。
Generally, the procedure for producing a container from a thermoplastic sheet by a vacuum forming method is as follows.
After the thermoplastic sheet is heated and softened by a heater or the like, the space between the thermoplastic sheet and the mold is evacuated, the sheet and the mold are brought into close contact with each other, molded, cooled, and then trimmed into a predetermined container shape. I do.

【0004】脱酸素性多層シートから脱酸素性多層容器
を製造する場合にも、先述の容器の製造工程を適用する
ことができるが、フランジ付き脱酸素性多層容器を同様
の方法で製造すると、脱酸素剤組成物を含む酸素吸収樹
脂層がフランジの外周縁の切断面に肉眼で確認できる程
度の厚みで露出する。
[0004] In the case of producing a deoxygenated multilayer container from a deoxygenated multilayer sheet, the above-described container production process can be applied. However, if a flanged deoxygenated multilayer container is produced by the same method, The oxygen-absorbing resin layer containing the oxygen scavenger composition is exposed on the cut surface of the outer peripheral edge of the flange with a thickness that can be visually confirmed.

【0005】そして、このようなフランジ付き脱酸素性
多層容器からなる包装体を長期保存したり、レトルト処
理、ボイル処理等を行うと、酸化して錆びた脱酸素剤組
成物がフランジ外周縁の切断面に露出し、包装体の外観
が悪化する欠点がある。ところが、このようなフランジ
外周縁の切断面に酸素吸収樹脂層が大きく露出したフラ
ンジ付き脱酸素性多層容器であっても、特別な処理が施
されることもなくそのまま使用されているのが現状であ
る。
[0005] When the package made of such a deoxygenated multilayer container with a flange is stored for a long time, or subjected to a retort treatment, a boil treatment or the like, an oxidized and rusted oxygen-absorbing agent composition is formed on the outer peripheral edge of the flange. There is a disadvantage that the package is exposed to the cut surface and the appearance of the package deteriorates. However, even in the case of such a deoxygenated multilayer container with a flange in which the oxygen-absorbing resin layer is largely exposed on the cut surface of the outer peripheral edge of the flange, it is currently used without any special treatment. It is.

【0006】本発明の目的は、上述した問題点を解決
し、フランジ付き脱酸素性多層容器のフランジ外周縁の
切断面において、酸素吸収樹脂層の露出を大幅に低減さ
せ、容器を長期保存したり、レトルト処理及びボイル処
理等を施しても、従来のようなフランジ外周縁の切断面
に見られる脱酸素剤に起因する錆の発生を大幅に低減で
き、良好な外観を維持することが可能なフランジ付き脱
酸素性多層容器の製造方法を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to greatly reduce the exposure of the oxygen-absorbing resin layer on the cut surface of the outer peripheral edge of the flange of the deoxygenated multilayer container provided with a flange, thereby preserving the container for a long period of time. Or retort treatment, boil treatment, etc., can greatly reduce the occurrence of rust due to the oxygen scavenger seen on the cut surface of the flange outer peripheral edge as before, and it is possible to maintain a good appearance It is an object of the present invention to provide a method for producing a deoxygenated multilayer container with a flange.

【0007】[0007]

【課題を解決するための手段】本発明者らは、前記のよ
うな問題点に鑑み、脱酸素性多層容器の製造方法につい
て鋭意研究を重ねた結果、容器成形用型のフランジ形成
部の外周に凸部を設け、該成形用型を用いて真空成形法
で脱酸素性多層シートから容器を成形することにより、
容器成形と同時にフランジの外周部において前記凸部で
脱酸素性多層シートを圧潰して薄肉部を形成し、その後
のトリミング工程で前記薄肉部を裁断することで、容器
のフランジ外周縁の切断面における酸素吸収樹脂層の露
出を大幅に低減でき、仮に酸素吸収樹脂層中の脱酸素剤
が酸化しても目視できない程度のものとすることがで
き、良好な外観を維持することが可能であることを見い
出した。
Means for Solving the Problems In view of the above problems, the present inventors have conducted intensive studies on a method for producing a deoxidized multilayer container. By providing a convex portion, and molding the container from the deoxidized multilayer sheet by a vacuum molding method using the molding die,
At the same time as forming the container, the deoxygenated multilayer sheet is crushed at the convex portion at the outer peripheral portion of the flange to form a thin portion, and the thin portion is cut in a subsequent trimming step, so that the cut surface of the outer peripheral edge of the flange of the container The exposure of the oxygen-absorbing resin layer in can be greatly reduced, and even if the oxygen scavenger in the oxygen-absorbing resin layer is oxidized, it can be made invisible to the extent that it can be maintained, and a good appearance can be maintained. I found something.

【0008】すなわち、本発明は、(1)中間層として
脱酸素剤組成物を配合してなる酸素吸収樹脂層を有する
脱酸素性多層シートから真空成形法によりフランジ付き
多層容器を成形した後所定のトリミングを行う脱酸素性
多層容器の製造方法であって、フランジ形成部の外周に
凸部を設けた容器成形用型で脱酸素性多層シートを成形
することにより容器の成形と同時に前記凸部で多層シー
トを圧潰してフランジ部外周に薄肉部を形成し、裁断工
程で前記薄肉部を裁断することを特徴とする脱酸素性多
層容器の製造方法を提供するものである。
That is, the present invention provides (1) forming a flanged multilayer container from an oxygen-absorbing multilayer sheet having an oxygen-absorbing resin layer containing an oxygen-absorbing composition as an intermediate layer by a vacuum molding method, A method for producing a deoxygenated multilayer container for performing trimming of the container, wherein the convex portion is formed simultaneously with the molding of the container by forming a deoxygenated multilayer sheet with a container forming mold provided with a convex portion on the outer periphery of a flange forming portion. And forming a thin portion on the outer periphery of the flange portion by crushing the multilayer sheet, and cutting the thin portion in a cutting step.

【0009】これにより、フランジ外周縁の切断面に露
出する酸素吸収樹脂層の層厚は極めて僅かなものとな
り、仮に前記切断面における酸素吸収樹脂層中の脱酸素
剤組成物に起因する錆の発生が生じたとしても目視でき
ない程度のものとすることができ、良好な外観を維持す
ることが可能である。
As a result, the thickness of the oxygen-absorbing resin layer exposed on the cut surface of the outer peripheral edge of the flange becomes extremely small, and if the oxygen-absorbing resin layer in the oxygen-absorbent resin layer on the cut surface has a rust, Even if the occurrence occurs, it can be made invisible to the naked eye, and a good appearance can be maintained.

【0010】[0010]

【発明の実施の形態】またその態様として、(2)上記
(1)記載の脱酸素性多層容器の製造方法において、凸
部が上型に設けられた成形用型で成形することにより多
層シートを下層方向に圧潰することを特徴とする製造方
法があげられる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (2) In the method for producing a deoxidized multilayer container described in the above (1), a multilayer sheet is formed by molding with a molding die provided with a convex portion on an upper die. Is crushed in the lower layer direction.

【0011】これにより、薄肉部が多層シートの下層寄
りに形成され、裁断作業が容易となる。
As a result, the thin portion is formed closer to the lower layer of the multilayer sheet, and the cutting operation is facilitated.

【0012】また、別の態様として、(3)上記(1)
記載の脱酸素性多層容器の製造方法において、凸部が上
型と下型に対峙して設けられた成形用型で成形すること
により多層シートを中間層方向に圧潰することを特徴と
する製造方法があげられる。
In another aspect, (3) the above (1)
The method for producing a deoxidized multilayer container according to the above, characterized in that the multilayer sheet is crushed in the direction of the intermediate layer by forming the convex portion with a molding die provided to face the upper die and the lower die. There is a method.

【0013】これにより、薄肉部がフランジ外周縁の中
間部に形成され、切断面がフランジの中間部に位置して
上下のバランスが維持される。
Thus, the thin portion is formed in the middle part of the outer peripheral edge of the flange, and the cut surface is located in the middle part of the flange, so that the vertical balance is maintained.

【0014】更に、別の態様として、(4)上記(1)
記載の脱酸素性多層容器の製造方法において、薄肉部の
厚さ(つまり、切断面の高さ寸法)が10μm以上でか
つ多層シートの厚さの70%以下であることを特徴とす
る製造方法があげられる。
Further, as another aspect, (4) the above (1)
The method for producing a deoxidized multilayer container according to the above, wherein the thickness of the thin portion (that is, the height of the cut surface) is 10 μm or more and 70% or less of the thickness of the multilayer sheet. Is raised.

【0015】これにより、凸部でパンチングされてしま
って成形後に容器が成形型内に残ったりすることはな
く、また、トリミングを確実に行うことができる。
Thus, the container does not remain in the mold after molding due to punching at the convex portion, and the trimming can be performed reliably.

【0016】本発明の実施形態を図面に基づいて説明す
る。なお、本発明はこれらの実施例によって限定される
ものではない。また、以下の説明において、フランジ付
き脱酸素性多層容器を単に容器ということがあり、脱酸
素性多層シートを単にシートということがある。
An embodiment of the present invention will be described with reference to the drawings. The present invention is not limited by these examples. In the following description, the oxygen-removable multilayer container with a flange may be simply referred to as a container, and the oxygen-removable multilayer sheet may be simply referred to as a sheet.

【0017】本発明における脱酸素性多層シート8は、
厚さが0.3mm〜5mmのものであり、図1に示すよ
うに、脱酸素剤組成物を配合した酸素吸収樹脂層を層2
として、酸素吸収樹脂層が被包装物と直接接触するのを
確実に防ぐ隔離層の役割を果たすと共に効率良い酸素透
過を行う層1、外部からの酸素の進入を防ぎ且つ酸素吸
収樹脂層の酸素吸収能力を維持する層3の、少なくとも
三層以上の多層構造をなし、酸素吸収樹脂層である層2
が中間層となっている。
The deoxidizing multilayer sheet 8 of the present invention comprises:
As shown in FIG. 1, an oxygen absorbing resin layer containing an oxygen scavenger composition was formed into a layer 2 having a thickness of 0.3 mm to 5 mm.
A layer 1 that functions as an isolation layer that reliably prevents the oxygen-absorbing resin layer from coming into direct contact with the packaged object and that performs efficient oxygen permeation; prevents oxygen from entering from outside; Layer 2 which has a multilayer structure of at least three or more layers and is an oxygen-absorbing resin layer, of layer 3 which maintains absorption capacity.
Is an intermediate layer.

【0018】酸素吸収樹脂層である層2は、熱可塑性樹
脂に鉄粉系脱酸素剤を混練し分散してなる樹脂組成物か
らなる。熱可塑性樹脂としては、鉄粉系脱酸素剤と混練
して酸素を吸収することができる樹脂であればよく、例
えば、低密度ポリエチレン,中密度ポリエチレン,高密
度ポリエチレン,ポリプロピレン,プロピレン−エチレ
ン共重合体,エチレン−酢酸ビニル共重合体、これらの
ブレンド物等のオレフィン系樹脂、ポリスチレン,スチ
レン−ブタジエン共重合体,スチレン−イソプレン共重
合体等のスチレン系樹脂等が挙げられる。これらの樹脂
は単独でもブレンド物としても使用できる。
The layer 2, which is an oxygen-absorbing resin layer, is made of a resin composition obtained by kneading and dispersing an iron powder-based oxygen absorber into a thermoplastic resin. The thermoplastic resin may be any resin that can absorb oxygen by being kneaded with an iron powder-based oxygen absorber, and examples thereof include low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, and propylene-ethylene copolymer. Olefin resins such as unified, ethylene-vinyl acetate copolymers and blends thereof, and styrene resins such as polystyrene, styrene-butadiene copolymer, and styrene-isoprene copolymer. These resins can be used alone or as a blend.

【0019】熱可塑性樹脂に配合される鉄粉系脱酸素剤
は、鉄粉及びハロゲン化金属からなる公知の脱酸素剤を
使用することができる。鉄粉としては、還元鉄粉,噴霧
鉄粉等の各種製法で得られる鉄粉を使用することがで
き、鉄粉の粒径は10〜50μmが好ましく、その最大
粒子径は酸素吸収樹脂層の加工を考慮して制限を受け
る。ハロゲン化金属としては、塩化ナトリウム,臭化ナ
トリウム,ヨウ化ナトリウム,塩化カリウム,ヨウ化カ
リウム,臭化カリウム,塩化カルシウム,塩化マグネシ
ウム又は塩化バリウム等で例示されるアルカリ金属又は
アルカリ土類金属のハロゲン化物の一種又は二種以上が
好ましく用いられる。
As the iron powder-based oxygen scavenger to be mixed with the thermoplastic resin, a known oxygen scavenger composed of iron powder and a metal halide can be used. As the iron powder, iron powder obtained by various methods such as reduced iron powder and spray iron powder can be used, and the particle diameter of the iron powder is preferably 10 to 50 μm. Limited due to processing considerations. Examples of the metal halide include alkali metal and alkaline earth metal halogens exemplified by sodium chloride, sodium bromide, sodium iodide, potassium chloride, potassium iodide, potassium bromide, calcium chloride, magnesium chloride and barium chloride. One or more compounds are preferably used.

【0020】酸素吸収樹脂層に対する保護層である層1
としては、酸素吸収樹脂層に用いられる熱可塑性樹脂が
用いられるが、この層にシール性やピール性を付与する
ために、ポリビニルアルコール,ポリスチレン,アイオ
ノマー等の樹脂を添加したり、多層化したりすることも
できる。
Layer 1 which is a protective layer for the oxygen absorbing resin layer
The thermoplastic resin used for the oxygen-absorbing resin layer is used, and a resin such as polyvinyl alcohol, polystyrene, ionomer, or the like is added or multilayered in order to impart a sealing property or a peeling property to this layer. You can also.

【0021】バリア層である層3としては、エチレン−
ビニルアルコール共重合体,ナイロン,ポリ塩化ビニリ
デン等のガスバリア性樹脂が用いられる。
The layer 3 serving as a barrier layer is made of ethylene-
Gas barrier resins such as vinyl alcohol copolymer, nylon, and polyvinylidene chloride are used.

【0022】前記の層1,層2は単層に限らず、例え
ば、接着剤層等を含めた多層であってもよい。前記のよ
うな構成の脱酸素性多層シート8から真空成形法によっ
て前記層1を内側とするフランジ付き容器を成形し、所
定の容器形状にトリミングして図4−2に示すようなフ
ランジ11a付き脱酸素性多層容器11を得る。使用に
際しては、図5に示すように、被包装物13を収納した
後、バリア性を有するトップフィルム12によってシー
ルされる。このような形態をとることにより、容器内部
の空間部や被包装物自体に存在する酸素が、被包装物と
接する層1を透過して酸素吸収樹脂層である層2に吸収
される。なお、層2自体は酸素吸収反応に必要な水分は
保有しておらず、層2内の脱酸素剤組成物は層1を介し
て容器内部から蒸散してくる水分を得て酸素を吸収する
ことができる。
The layers 1 and 2 are not limited to a single layer, but may be a multilayer including an adhesive layer and the like. From the oxygen-absorbing multilayer sheet 8 having the above-described configuration, a container with a flange having the layer 1 inside is formed by a vacuum forming method, trimmed into a predetermined container shape, and provided with a flange 11a as shown in FIG. The deoxygenated multilayer container 11 is obtained. At the time of use, as shown in FIG. 5, after the article to be packaged 13 is stored, it is sealed with the top film 12 having a barrier property. With this configuration, oxygen present in the space inside the container and the package itself permeates through the layer 1 in contact with the package and is absorbed by the layer 2 that is the oxygen absorbing resin layer. Note that the layer 2 itself does not hold the water necessary for the oxygen absorption reaction, and the oxygen scavenger composition in the layer 2 absorbs oxygen by obtaining moisture evaporating from the inside of the container via the layer 1. be able to.

【0023】保存に適する被包装物としては、例えば、
多水分食品や飲料、医薬品等が挙げられる。具体的には
多水分食品としては、炊飯米,煮物,揚げ物等の惣菜
類、和菓子,ケーキ等の菓子類、ソーセージ,ハム等の
畜肉加工品類等が挙げられる。飲料としては、オレンジ
ジュース等のジュース類、日本酒,ウイスキー等の酒類
が挙げられる。医薬品としては、輸液バッグなどが挙げ
られる。
Examples of the packaged articles suitable for storage include, for example,
Examples include high moisture foods, beverages, and pharmaceuticals. Specifically, examples of high moisture foods include prepared foods such as cooked rice, boiled foods and fried foods, sweets such as Japanese sweets and cakes, and processed meat products such as sausages and hams. Examples of the drink include juices such as orange juice, and sakes such as sake and whiskey. Examples of the drug include an infusion bag and the like.

【0024】脱酸素性多層容器11の製造に際し、本発
明では、図2−1又は図2−2で示すように、フランジ
形成部の外周に凸部を設けた容器成形用型で脱酸素性多
層シート8を成形することにより、容器の成形と同時に
前記凸部で多層シート8を圧潰してフランジ11aの外
周に薄肉部9を形成し、裁断工程で前記薄肉部9を裁断
する。
In the production of the deoxidizing multilayer container 11, according to the present invention, as shown in FIG. 2-1 or FIG. By molding the multi-layer sheet 8, the multi-layer sheet 8 is crushed by the convex portions at the same time as the container is formed to form a thin portion 9 on the outer periphery of the flange 11a, and the thin portion 9 is cut in a cutting step.

【0025】容器成形用型は、プラグ1を有する上型
(雄型)2とこれに対応する下型(雌型)4とで構成さ
れ、前記フランジ11aを形成するためのフランジ形成
部2a,4aをそれぞれ備えている。図2−1に示す成
形用型においては、上型2と下型4のそれぞれのフラン
ジ形成部2a,4aの外周に凸部3,凸部5を互いの位
置が一致するように対峙させて設けてあり、凸部5の高
さは凸部3の高さよりも低くなっている。図2−2に示
す成形用型においては、上型2のフランジ形成部2aの
外周にのみ凸部3を設けてある。
The container forming mold is composed of an upper mold (male mold) 2 having a plug 1 and a corresponding lower mold (female mold) 4 having a flange forming portion 2a for forming the flange 11a. 4a. In the molding die shown in FIG. 2A, the convex portions 3 and the convex portions 5 are made to face each other on the outer periphery of the flange forming portions 2a and 4a of the upper die 2 and the lower die 4 so that the positions thereof coincide with each other. The height of the projection 5 is lower than the height of the projection 3. In the molding die shown in FIG. 2-2, the convex portion 3 is provided only on the outer periphery of the flange forming portion 2a of the upper die 2.

【0026】一般に、真空成形法は、加熱工程,成形工
程,冷却工程及び裁断工程からなるが、成形工程として
は、成形品の形状や目的により、ストレート成形,プラ
グアシスト成形等、各種の成形法がある。本発明では、
前記のような構成の容器成形用型で、加熱軟化された脱
酸素性多層シート8を真空成形すると同時に、前記凸部
で該脱酸素性多層シート8を圧潰して薄肉部9を形成す
る方法であるから、前記の種々の成形法のうち、本発明
では二つの型で脱酸素性多層シート8を上下から挟む形
式の成形法が用いられ、特にプラグアシスト成形が好ま
しく用いられる。
In general, the vacuum forming method comprises a heating step, a forming step, a cooling step and a cutting step. The forming step includes various forming methods such as straight forming and plug assist forming, depending on the shape and purpose of the molded article. There is. In the present invention,
A method of vacuum-forming the heat-softened oxygen-absorbing multilayer sheet 8 with the container-forming mold having the above-described structure, and simultaneously crushing the oxygen-absorbing multilayer sheet 8 with the projections to form a thin-walled portion 9. Therefore, among the various molding methods described above, in the present invention, a molding method of sandwiching the deoxidizing multilayer sheet 8 from above and below with two dies is used, and particularly, plug assist molding is preferably used.

【0027】図3−1は図2−1の成形用型で成形する
状態を示し、図3−2は図2−2の成形用型で成形する
状態を示しており、図3−1では上型2の凸部3と下型
4の凸部5とで脱酸素性多層シート8が圧潰され、図3
−2では上型2の凸部3と下型4の平面部6とで脱酸素
性多層シート8が圧潰されて、薄肉部9が形成される。
FIG. 3-1 shows a state of molding with the molding die of FIG. 2-1, FIG. 3-2 shows a state of molding with the molding die of FIG. 2-2, and FIG. The deoxidized multilayer sheet 8 is crushed by the projections 3 of the upper mold 2 and the projections 5 of the lower mold 4, and FIG.
In -2, the deoxidized multilayer sheet 8 is crushed by the convex portion 3 of the upper die 2 and the flat portion 6 of the lower die 4 to form a thin portion 9.

【0028】上型2に設ける凸部3の高さは、該凸部3
が下型4の凸部5又は平面部6と接触した時に、上型2
の平面部7と下型4の平面部6の間隔が脱酸素性多層シ
ート8の総厚みより大きくなるようにする。このシート
総厚みより間隔が狭いと、脱酸素性多層シート8が型の
平面部に接触して、均一な厚みを有するフランジ部とな
らない場合がある。また、図2−1に示すように、下型
4にも凸部5を設ける場合には、その凸部5の高さは、
シート総厚み以下の高さとする。総厚み以上の高さにす
ると、フランジ端部が階段状に盛り上がった形状にな
り、後にトップフィルムとヒートシールする際に、シー
ル不良を起こしやすくなる。
The height of the projection 3 provided on the upper mold 2 is
Is in contact with the convex part 5 or the flat part 6 of the lower mold 4,
The distance between the flat part 7 of the lower mold 4 and the flat part 6 of the lower mold 4 is set to be larger than the total thickness of the deoxidizing multilayer sheet 8. If the interval is smaller than the total thickness of the sheet, the oxygen-absorbing multilayer sheet 8 may come into contact with the flat portion of the mold and may not be a flange portion having a uniform thickness. In addition, as shown in FIG. 2A, when the convex portion 5 is also provided on the lower mold 4, the height of the convex portion 5 is
The height shall be less than the total thickness of the sheet. When the height is equal to or more than the total thickness, the flange end has a stepped-up shape, and when heat-sealing with the top film later, poor sealing is likely to occur.

【0029】真空成形時に上型2と下型4が最も接近し
たときにおいて、図3−1の形態における凸部3と凸部
5との間隔、或は図3−2の形態における凸部3と平面
部6との間隔は脱酸素性多層シート8の厚みの70%以
下となるように成形条件を設定する。このようにすれ
ば、その後の裁断工程において薄肉部9で裁断すれば、
フランジ11aの外周縁の切断面に露出する酸素吸収樹
脂層2の層厚が大幅に減少する。
When the upper mold 2 and the lower mold 4 are closest to each other during vacuum forming, the distance between the convex portions 3 and 5 in the form of FIG. 3A or the convex section 3 in the form of FIG. The molding conditions are set so that the distance between the sheet and the flat portion 6 is 70% or less of the thickness of the deoxidizing multilayer sheet 8. In this way, if the thin portion 9 is cut in the subsequent cutting process,
The thickness of the oxygen-absorbing resin layer 2 exposed on the cut surface of the outer peripheral edge of the flange 11a is greatly reduced.

【0030】凸部3,5によって形成されたシート上の
薄肉部9の厚さは0.01mm以上で、かつシート厚み
の70%以下であることが好ましい。50%以下であれ
ばより好ましい。肉薄部9が0.01mmよりも薄いと
成形直後に肉薄部がパンチングされて容器が金型内に残
ったり、裁断工程においてトリミング不良を起こす可能
性がある。また、薄肉部9がシート厚みの70%よりも
厚いとフランジ外周縁を薄肉化した効果が少なく、フラ
ンジ11aの外周縁の切断面における酸素吸収樹脂層の
露出が大きくなる。
The thickness of the thin portion 9 on the sheet formed by the convex portions 3 and 5 is preferably 0.01 mm or more and 70% or less of the sheet thickness. More preferably, it is 50% or less. If the thin portion 9 is thinner than 0.01 mm, the thin portion may be punched immediately after molding and the container may remain in the mold, or trimming failure may occur in the cutting process. If the thin portion 9 is thicker than 70% of the sheet thickness, the effect of reducing the thickness of the outer peripheral edge of the flange is small, and the exposure of the oxygen absorbing resin layer on the cut surface of the outer peripheral edge of the flange 11a increases.

【0031】本発明では、容器成形工程で形成されたフ
ランジ外周の薄肉部9にてトリミングを行うが、トリミ
ングミスを少なくするため、薄肉部9の幅は広い方がよ
い。ただし、金型の設計上の都合等から凸部3,5の幅
を狭くする場合でも1mm以上は確保した方がよい。ま
た、トリミングは薄肉部9の部分において、できるだけ
フランジ11aの端部に近い部位で行う方が容器の外観
上好ましいが、トリミング精度に問題がある場合は、そ
れを考慮して決定すればよい。いずれにしても、容器成
形工程で形成された薄肉部9にてトリミングを行えば、
切断面に露出する酸素吸収樹脂層2の層厚は大幅に低減
する。
In the present invention, trimming is performed at the thin portion 9 on the outer periphery of the flange formed in the container forming step, but the width of the thin portion 9 is preferably wide to reduce trimming errors. However, even when the widths of the projections 3 and 5 are reduced for reasons such as the design of the mold, it is better to secure 1 mm or more. Further, it is preferable in terms of the appearance of the container that the trimming be performed at a portion of the thin portion 9 as close to the end of the flange 11a as possible. However, if there is a problem in the trimming accuracy, the trimming may be determined in consideration of the problem. In any case, if trimming is performed on the thin portion 9 formed in the container forming process,
The thickness of the oxygen-absorbing resin layer 2 exposed on the cut surface is greatly reduced.

【0032】例えば、図2−2に示すように、プラグ1
が設けられた上型2のみに凸型3を設けた成形用型を用
いて、プラグアシスト成形法により本発明の脱酸素性多
層容器を製造する方法は以下のようになる。図4−1に
示すように、クランプ10に固定され、加熱軟化された
脱酸素性多層シート8を上型2と下型3の間に移動す
る。上型2と下型3を相対移動させ、プラグ1で脱酸素
性多層シート8を絞りながら、脱酸素性多層シート8と
下型4の間を真空にして脱酸素性多層シート8を下型4
に密着させる。このとき、上型2の凸部3が脱酸素性多
層シート8に食い込むことにより、容器成形と同時にフ
ランジ11aの外周部に薄肉部9が形成される。薄肉部
9の各層の様子は、図4−2の拡大断面図に示すよう
に、各層が薄くなっている。前記のようにして成形され
た容器を冷却した後、薄肉部9でトリミングすること
で、フランジ11aの外周部が薄肉化され、図4−2に
示すようにフランジ外周縁の切断面における酸素吸収樹
脂層2の露出が大幅に減少した、図4−3のような形状
のフランジ付き脱酸素性多層容器11が得られる。
For example, as shown in FIG.
The method for producing the oxygen-removable multilayer container of the present invention by a plug-assist molding method using a molding die having only the upper mold 2 provided with the convex die 3 is provided as follows. As shown in FIG. 4A, the deoxidized multilayer sheet 8 fixed to the clamp 10 and heated and softened is moved between the upper mold 2 and the lower mold 3. The upper mold 2 and the lower mold 3 are relatively moved, and while the oxygen-absorbing multilayer sheet 8 is squeezed with the plug 1, a vacuum is applied between the oxygen-absorbing multilayer sheet 8 and the lower mold 4 to lower the oxygen-absorbing multilayer sheet 8. 4
In close contact. At this time, the convex portion 3 of the upper die 2 bites into the oxygen-reducing multilayer sheet 8, so that the thin portion 9 is formed on the outer peripheral portion of the flange 11a simultaneously with the molding of the container. As for the state of each layer of the thin portion 9, as shown in the enlarged sectional view of FIG. After cooling the container formed as described above, the outer peripheral portion of the flange 11a is thinned by trimming at the thin portion 9, and oxygen absorption in the cut surface of the outer peripheral edge of the flange as shown in FIG. 4-2. The multilayer oxygenated container 11 with a flange as shown in FIG. 4C, in which the exposure of the resin layer 2 is greatly reduced, is obtained.

【0033】フランジ11aの外周部に薄肉部9を形成
する他の方法としては、冷却工程後又は裁断工程後にフ
ランジ外周縁を熱プレスして薄く加工する方法もある
が、容器の製造工程が増えたり、また場合によっては酸
素吸収樹脂層2がはみ出して外観を悪化させることがあ
るため、好ましい方法とはいえない。
As another method of forming the thin portion 9 on the outer peripheral portion of the flange 11a, there is a method of hot-pressing the outer peripheral edge of the flange after the cooling step or the cutting step to thinly process the container. In some cases, the oxygen-absorbing resin layer 2 may protrude to deteriorate the appearance, which is not a preferable method.

【0034】本発明のように、脱酸素性多層容器11の
フランジ外周部を薄肉化した場合、裁断工程にてトリミ
ングする際の切断面のバリの発生やトリミング不良の発
生が少なくなる。更に、フランジ11aの外周縁の切断
面における酸素吸収樹脂層の露出が少なくなるため、レ
トルト処理やボイル処理等を行っても、長期にわたって
外観を良好に保つことが可能となる。
When the outer peripheral portion of the flange of the deoxidizing multilayer container 11 is made thinner as in the present invention, the occurrence of burrs on the cut surface and the occurrence of poor trimming during trimming in the cutting step are reduced. Furthermore, since the exposure of the oxygen-absorbing resin layer on the cut surface of the outer peripheral edge of the flange 11a is reduced, it is possible to maintain a good appearance for a long time even if retort treatment, boil treatment, or the like is performed.

【0035】[0035]

【実施例】【Example】

実施例1 平均粒径35μmの鉄粉を加熱ジャケット付き真空混合
乾燥機内に入れ、130℃、10mmHgの減圧下で加
熱乾燥しつつ、鉄粉100重量部に対し、塩化カルシウ
ム:塩化ナトリウム:水=1:1:5(重量部)の割合
で混合した混合水溶液を噴霧し、塩化カルシウム及び塩
化ナトリウムを鉄粉表面に付着させた粒状の脱酸素剤組
成物を得た。次に、45mmφの同方向回転二軸押出機
にて、ポリプロピレン:脱酸素剤組成物=7:3の重量
比で混合し、ブロワ付きネットベルトで冷却した後、ペ
レタイザーを経て脱酸素剤組成物配合ペレットを得た。
Example 1 Iron powder having an average particle size of 35 μm was placed in a vacuum mixing dryer equipped with a heating jacket, and heated and dried at 130 ° C. under a reduced pressure of 10 mmHg, and calcium chloride: sodium chloride: water = A mixed aqueous solution mixed at a ratio of 1: 1: 5 (parts by weight) was sprayed to obtain a granular oxygen absorber composition in which calcium chloride and sodium chloride were adhered to the iron powder surface. Next, in a 45 mmφ co-rotating twin-screw extruder, the mixture was mixed at a weight ratio of polypropylene: oxygen scavenger composition = 7: 3, cooled with a net belt equipped with a blower, and then passed through a pelletizer to remove the oxygen scavenger composition. A blended pellet was obtained.

【0036】第1〜第4押出機、フィードブロック、T
ダイ、冷却ロール及びシート引取機からなる4種6層多
層シート製造装置を用い、第1の押出機に白色顔料添加
ポリプロピレンのペレットを、第2の押出機に前記脱酸
素剤組成物配合ペレットを、第3の押出機にエチレン−
ビニルアルコール共重合体を、第4の押出機に無水マレ
イン酸変成ポリプロピレンをそれぞれ入れ、各押出機か
ら同期的に押し出して、脱酸素性多層シート8を得た。
この脱酸素性多層シート8は、図1に示すように、酸素
透過性を有する白色顔料添加ポリプロピレンからなる層
1(膜厚160μm)と、前記脱酸素剤組成物配合ペレ
ットからなり、酸素吸収性能を有する層2(膜厚230
μm)と、無水マレイン酸変成ポリプロピレンからなる
層3−1(膜厚30μm)、エチレン−ビニルアルコー
ル共重合体からなる層3−2(膜厚50μm)、無水マ
レイン酸変成ポリプロピレンからなる層3−3(膜厚3
0μm)、白色顔料添加ポリプロピレンからなる層3−
4(膜厚300μm)から構成され、酸素バリア性を有
する層3がこの順に積層されている。
First to fourth extruders, feed block, T
Using a four-type, six-layer multi-layer sheet manufacturing apparatus including a die, a cooling roll, and a sheet take-off machine, the first extruder was used to mix white pigment-added polypropylene pellets, and the second extruder was used to mix the oxygen-absorbing composition-containing pellets. , A third extruder with ethylene-
The vinyl alcohol copolymer was charged with maleic anhydride-modified polypropylene in a fourth extruder, and extruded synchronously from each extruder to obtain a deoxidized multilayer sheet 8.
As shown in FIG. 1, the oxygen-absorbing multilayer sheet 8 is composed of a layer 1 (thickness: 160 μm) made of a white pigment-added polypropylene having oxygen permeability and the above-mentioned oxygen-absorbing composition-containing pellets. Layer 2 having a thickness of 230
μm), a layer 3-1 (thickness 30 μm) made of modified maleic anhydride polypropylene, a layer 3-2 (thickness 50 μm) made of an ethylene-vinyl alcohol copolymer, and a layer 3- made of maleic anhydride modified polypropylene. 3 (thickness 3
0 μm), a layer 3 composed of white pigment-added polypropylene
4 (thickness: 300 μm), and layers 3 having oxygen barrier properties are stacked in this order.

【0037】次に、図2−2に示す形態の容器成形用型
(凸部3の高さ10mm、巾5mm)を真空成形機に設
置した。前記脱酸素性多層シート8の層1をプラグ1側
にし、成形工程において上型2の凸部3と下型4の平面
部6が最も接近したときの間隔が0.1mmとなるよう
に成形条件を設定して、図4−1に示す工程で約180
℃でプラグアシスト成形を行った。この形態においては
前記脱酸素性多層シート8は凸部3により、図4−2に
示すように、下層である層3方向に圧潰されて薄肉部9
が形成される。成形された容器を冷却した後、図4−2
に示すように、薄肉部9にてトリミングを行い、図4−
3に示すように、フランジ11aの外周部が薄肉化され
たトレイ状容器(縦150mm×横100mm×深さ3
0mm、内容積約450cc、フランジ幅10mm)1
1を得た。得られた容器において、薄肉化されたフラン
ジ外周部の厚さは約100μm、脱酸素剤組成物が配合
された層2の厚さは約30μmであった。
Next, a container molding die (the height of the convex portion 3 was 10 mm and the width was 5 mm) of the form shown in FIG. 2-2 was set in a vacuum molding machine. The layer 1 of the oxygen-absorbing multilayer sheet 8 is placed on the plug 1 side, and the molding is performed so that the distance between the convex portion 3 of the upper mold 2 and the flat portion 6 of the lower mold 4 in the molding process becomes 0.1 mm. The conditions are set, and about 180 in the process shown in FIG.
Plug-assist molding was performed at a temperature of ° C. In this embodiment, the oxygen-absorbing multilayer sheet 8 is crushed by the projections 3 in the direction of the lower layer 3 as shown in FIG.
Is formed. After cooling the molded container, FIG.
As shown in FIG.
As shown in FIG. 3, a tray-shaped container (150 mm long × 100 mm wide × 3 depth deep) in which the outer peripheral portion of the flange 11 a is thinned
0mm, Internal volume about 450cc, Flange width 10mm) 1
1 was obtained. In the obtained container, the thickness of the thinner flange outer peripheral portion was about 100 μm, and the thickness of the layer 2 containing the oxygen scavenger composition was about 30 μm.

【0038】次に、図5に示すように、本実施例で得ら
れたトレイ状容器に水を入れ、ほぼ満水とした後、カッ
プシーラーを用いてこのトレイ状容器にトップフィルム
12をヒートシールして密封した。トップフィルムはポ
リエチレンテレフタレート(PET)(膜厚12μm)
/アルミ箔(膜厚20μm)/ポリプロピレン(膜厚5
0μm)で構成されていた。次に、密封されたトレイ状
容器に関し、レトルト釜を使用して、120℃で30分
間の加熱処理を行い、処理後のフランジ11a外周縁の
切断面の外観を観察した。また、加熱処理を行わずに、
密封されたトレイ状容器を室温にて120日間保存し、
フランジ外周縁の切断面の外観の変化を観察した。結果
を表1に示す。
Next, as shown in FIG. 5, the tray-shaped container obtained in this embodiment is filled with water and almost filled with water, and then the top film 12 is heat-sealed to the tray-shaped container using a cup sealer. And sealed. The top film is polyethylene terephthalate (PET) (film thickness 12 μm)
/ Aluminum foil (film thickness 20μm) / polypropylene (film thickness 5
0 μm). Next, the sealed tray-shaped container was subjected to a heat treatment at 120 ° C. for 30 minutes using a retort pot, and the appearance of a cut surface of the outer peripheral edge of the flange 11a after the treatment was observed. Also, without performing the heat treatment,
Store the sealed tray at room temperature for 120 days,
Changes in the appearance of the cut surface at the outer peripheral edge of the flange were observed. Table 1 shows the results.

【0039】実施例2 図2−1に示す形態の容器成形用型(凸部5の高さ0.
5mm、巾5mm、凸部3の高さ10mm、巾5mm)
を真空成形機に設置した。実施例1で得られた脱酸素性
多層シート8の層1をプラグ1側にし、成形工程におい
て互いの凸部3、5が最も接近したときの間隔が約0.
1mmとなるように成形条件を設定して約180℃でプ
ラグアシスト成形した。この形態においては、前記脱酸
素性多層シート8は凸部3と凸部5により中間層である
層2方向に圧潰されて薄肉部9が形成された。その後、
実施例1と同様に、冷却及びトリミングを行い、実施例
1と同様のトレイ状容器を得た。得られた容器におい
て、薄肉化されたフランジ外周縁の厚さは約100μ
m、脱酸素剤組成物が配合された層2の厚さは約30μ
mであった。得られたトレイ状容器を用い、実施例1と
同様に、加熱処理、長期保存試験を行い、フランジ外周
縁の切断面の外観を観察した。結果を表1に示す。
Example 2 A container-forming mold having the form shown in FIG.
(5mm, width 5mm, height of convex part 3 10mm, width 5mm)
Was set in a vacuum forming machine. The layer 1 of the deoxidizing multilayer sheet 8 obtained in Example 1 is placed on the plug 1 side, and the interval when the convex portions 3 and 5 are closest to each other in the molding process is about 0.
The molding conditions were set so as to be 1 mm, and plug assist molding was performed at about 180 ° C. In this embodiment, the oxygen-absorbing multilayer sheet 8 was crushed by the convex portions 3 and the convex portions 5 in the direction of the intermediate layer 2 to form the thin portions 9. afterwards,
Cooling and trimming were performed in the same manner as in Example 1 to obtain the same tray-shaped container as in Example 1. In the obtained container, the thickness of the outer periphery of the thinned flange is about 100 μm.
m, the thickness of the layer 2 containing the oxygen scavenger composition is about 30 μm.
m. Using the obtained tray-shaped container, a heat treatment and a long-term storage test were performed in the same manner as in Example 1, and the appearance of the cut surface of the outer peripheral edge of the flange was observed. Table 1 shows the results.

【0040】実施例3 図2−2に示す形態の容器成形用型(凸部3の高さ10
mm、巾5mm)を真空成形機に設置した。実施例1で
得られた脱酸素性多層シート8の層1をプラグ1側に
し、成形工程において上型2の凸部3と下型4の平面部
6が最も接近したときの間隔が0.5mmとなるように
成形条件を設定して約180℃でプラグアシスト成形し
た。これを冷却後、トリミングを行い、フランジ外周部
が薄肉化された実施例1と同様のトレイ状容器を得た。
得られた容器において、薄肉化されたフランジ外周部の
厚さは約500μm、脱酸素剤組成物が配合された層2
の厚さは約140μmであった。得られたトレイ状容器
を用い、実施例1と同様に、加熱処理や長期保存試験を
行い、フランジ外周縁の切断面の外観を観察した。結果
を表1に示す。
Example 3 A container-forming mold having the form shown in FIG.
mm, width 5 mm) was installed in a vacuum forming machine. The layer 1 of the deoxidized multilayer sheet 8 obtained in Example 1 is placed on the plug 1 side, and the interval when the convex portion 3 of the upper mold 2 and the flat portion 6 of the lower mold 4 are closest to each other in the molding step is 0. The molding conditions were set so as to be 5 mm, and plug assist molding was performed at about 180 ° C. After cooling, trimming was performed to obtain the same tray-shaped container as in Example 1 in which the outer peripheral portion of the flange was thinned.
In the obtained container, the thickness of the outer periphery of the reduced-thickness flange is about 500 μm, and the layer 2 containing the oxygen scavenger composition is formed.
Had a thickness of about 140 μm. Using the obtained tray-shaped container, a heat treatment and a long-term storage test were performed in the same manner as in Example 1, and the appearance of the cut surface of the outer peripheral edge of the flange was observed. Table 1 shows the results.

【0041】比較例1 凸部を設けていない通常の容器成形用型を設置した真空
成形機を使用して、実施例1で得られた脱酸素性多層シ
ート8の層1をプラグ側にして約180℃でプラグアシ
スト成形を行い、実施例1と同様のトレイ状容器を得
た。得られた容器のフランジ外周部の厚さは、約800
μm、脱酸素剤組成物が配合された層2の厚さは約23
0μmであった。得られたトレイ状容器を用い、実施例
1と同様に、加熱処理や長期保存試験を行い、フランジ
外周縁の切断面の外観を観察した。結果を表1に示す。
Comparative Example 1 The layer 1 of the deoxidized multilayer sheet 8 obtained in Example 1 was placed on the plug side by using a vacuum forming machine provided with a normal container forming die having no projection. Plug-assist molding was performed at about 180 ° C. to obtain the same tray-shaped container as in Example 1. The thickness of the outer periphery of the flange of the obtained container is about 800
μm, the thickness of the layer 2 containing the oxygen scavenger composition is about 23
It was 0 μm. Using the obtained tray-shaped container, a heat treatment and a long-term storage test were performed in the same manner as in Example 1, and the appearance of the cut surface of the outer peripheral edge of the flange was observed. Table 1 shows the results.

【0042】比較例2 図2−2に示す形態の容器成形用型(凸部3の高さ10
mm、巾5mm)を真空成形機に設置し、実施例1で得
られた脱酸素性多層シート8の層1をプラグ1側にし、
成形工程において上型2の凸部3と下型4の平面部6が
最も接近したときの間隔が0.7mmとなるように成形
条件を設定して約180℃でプラグアシスト成形し、実
施例1と同様にして、冷却、トリミングを行い、フラン
ジ外周部が薄肉化された実施例1と同様のトレイ状容器
を得た。得られた容器において、薄肉化されたフランジ
外周部の厚さは約700μm、脱酸素剤組成物が配合さ
れた層2の厚さは約200μmであった。得られたトレ
イ状容器を用い、実施例1と同様に、加熱処理や長期保
存試験を行い、フランジ外周縁の切断面の外観を観察し
た。結果を表1に示す。
Comparative Example 2 A container molding die (having a height 10
mm, width 5 mm) was set in a vacuum forming machine, and the layer 1 of the deoxidized multilayer sheet 8 obtained in Example 1 was placed on the plug 1 side.
In the molding process, the molding conditions were set such that the distance between the convex portion 3 of the upper mold 2 and the flat portion 6 of the lower mold 4 was closest to 0.7 mm, and the plug assist molding was performed at about 180 ° C. In the same manner as in Example 1, cooling and trimming were performed to obtain a tray-shaped container similar to Example 1 in which the outer peripheral portion of the flange was thinned. In the obtained container, the thickness of the outer periphery of the thinned flange was about 700 μm, and the thickness of the layer 2 containing the oxygen scavenger composition was about 200 μm. Using the obtained tray-shaped container, a heat treatment and a long-term storage test were performed in the same manner as in Example 1, and the appearance of the cut surface of the outer peripheral edge of the flange was observed. Table 1 shows the results.

【0043】表1に示すように、本発明の実施例1から
実施例3で製造された脱酸素性多層容器は、加熱処理を
施した場合や、長期間室温で保存した場合でもフランジ
の外周縁の切断面(端面)に露出する酸素吸収樹脂層中
の脱酸素剤組成物に起因する錆の発生は極めて少なく、
良好な外観を保持できることが認められた。これに対し
て、フランジ外周部に処理を施していない比較例1や、
フランジ外周部に処理を施したとしても比較例2のよう
に適切でない場合は、加熱処理後に多量の錆が端面に発
生したり、長期間の保存においても錆が発生し、外観が
悪化することが認められた。
As shown in Table 1, the oxygen-desorbing multilayer containers manufactured in Examples 1 to 3 of the present invention were not subjected to heat treatment or stored at room temperature for a long period of time. Rust generation due to the oxygen scavenger composition in the oxygen absorbing resin layer exposed on the peripheral cut surface (end surface) is extremely small,
It was recognized that good appearance could be maintained. On the other hand, in Comparative Example 1 in which the outer peripheral portion of the flange was not treated,
Even if the outer periphery of the flange is treated, if it is not appropriate as in Comparative Example 2, a large amount of rust is generated on the end face after the heat treatment, and rust is generated even during long-term storage, and the appearance is deteriorated. Was observed.

【0044】[0044]

【表1】 [Table 1]

【0045】 評価項目 ◎;錆は全く見られない △;所々に錆が見られる ○;数カ所錆が見られる ×;多量に錆が見られるEvaluation items A: No rust was observed at all; R: Rust was observed at some places O: Rust was observed at several places X: A large amount of rust was observed

【0046】[0046]

【発明の効果】本発明の脱酸素性多層容器の製造方法に
よれば、得られた脱酸素性多層容器はそのフランジ外周
縁の切断面に露出する酸素吸収樹脂層の層厚は極めて僅
かなものとなり、仮に前記切断面における酸素吸収樹脂
層中の脱酸素剤組成物に起因する錆の発生が生じたとし
ても目視できない程度のものとすることができ、良好な
外観を維持することが可能となった。
According to the method for producing a deoxidized multilayer container of the present invention, the obtained deoxidized multilayer container has a very small thickness of the oxygen-absorbing resin layer exposed on the cut surface of the outer peripheral edge of the flange. Even if rust caused by the oxygen-absorbing composition in the oxygen-absorbing resin layer on the cut surface occurs, the rust can be made invisible to the extent that it is possible to maintain a good appearance. It became.

【0047】従って、本発明の脱酸素性多層容器の製造
方法で製造された脱酸素性多層容器は、長期保存やレト
ルト処理,ボイル処理等を行った場合でも、良好な外観
を維持することが可能となり、これまで脱酸素機能を必
要としながらも、錆の発生による外観の悪化が原因で需
要が広がらなかった分野での適用が期待される。
Therefore, the deoxidized multilayer container produced by the method for producing a deoxidized multilayer container of the present invention can maintain a good appearance even after long-term storage, retort treatment, boil treatment and the like. This is expected to be applicable to fields where demand has not been widespread due to deterioration in appearance due to rust, even though a deoxidizing function has been required so far.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る脱酸素性多層容器の製造方法の実
施に使用される脱酸素性多層シートの1例を示す断面
図。
FIG. 1 is a cross-sectional view showing an example of a deoxidizing multilayer sheet used for carrying out the method for producing a deoxidizing multilayer container according to the present invention.

【図2】本発明に係る脱酸素性多層容器の製造方法の実
施に使用される容器成形用型の1例を示し、図2−1は
上型と下型に凸部を設けた例を示す断面図、図2−2は
上型のみに凸部を設けた例を示す断面図。
FIG. 2 shows an example of a container forming die used for carrying out the method for producing a deoxidized multilayer container according to the present invention, and FIG. 2-1 shows an example in which convex portions are provided on an upper die and a lower die. FIG. 2-2 is a cross-sectional view showing an example in which only an upper mold is provided with a protrusion.

【図3】図2の容器成形用型で脱酸素性多層容器を成型
するに際してフランジ外周部に薄肉部を形成する工程を
示し、図3−1は図2−1の成形用型で成形する場合の
断面図、図3−2は図2−2の成形用型で成形する場合
の断面図。
FIG. 3 shows a step of forming a thin portion on an outer peripheral portion of a flange when molding a deoxidizing multilayer container with the container molding die of FIG. 2; FIG. 3-1 illustrates molding with the molding die of FIG. 2-1; FIG. 3-2 is a cross-sectional view of a case in which molding is performed using the molding die of FIG. 2-2.

【図4】本発明に係る脱酸素性多層容器の製造方法の実
施例を示し、図4−1は容器成型工程を示す断面図、図
4−2はフランジ外周部の薄肉部を拡大して模式的に示
す断面図、図4−3は製造された容器の断面図。
FIG. 4 shows an embodiment of the method for producing a deoxidized multilayer container according to the present invention. FIG. 4-1 is a cross-sectional view showing a container forming step, and FIG. 4-2 is an enlarged view of a thin portion at the outer periphery of a flange. Sectional drawing which shows typically, FIG. 4-3 is sectional drawing of the manufactured container.

【図5】本発明に係る脱酸素性多層容器に水を収容して
トップフィルムにて密封した包装容器の断面図。
FIG. 5 is a cross-sectional view of a packaging container in which water is contained in a deoxidizing multilayer container according to the present invention and sealed with a top film.

【符号の説明】[Explanation of symbols]

層1 熱可塑性樹脂層 層2 酸素吸収樹脂層 層3 酸素バリア層 層3−1 接着剤層 層3−2 酸素バリア層 層3−3 接着剤層 層3−4 熱可塑性樹脂層 1 プラグ 2 上型 2a 上型のフランジ成形部 3 上型に設けられた凸部 4 下型 4a 下型のフランジ成形部 5 下型に設けられた凸部 6 下型の平面部 7 上型の平面部 8 脱酸素性多層シート 9 薄肉部 10 クランプ 11 脱酸素性多層容器 11a フランジ 12 トップフィルム 13 水 Layer 1 Thermoplastic resin layer Layer 2 Oxygen absorbing resin layer Layer 3 Oxygen barrier layer Layer 3-1 Adhesive layer Layer 3-2 Oxygen barrier layer 3-3 Adhesive layer Layer 3-4 Thermoplastic resin layer 1 Plug 2 Mold 2a Flange forming part of upper die 3 Convex part provided on upper die 4 Lower die 4a Flange forming part of lower die 5 Convex part provided on lower die 6 Flat part of lower die 7 Flat part of upper die 8 Removal Oxygen multilayer sheet 9 Thin part 10 Clamp 11 Deoxygenation multilayer container 11a Flange 12 Top film 13 Water

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 中間層として脱酸素剤組成物を配合して
なる酸素吸収樹脂層を有する脱酸素性多層シートから真
空成形法によりフランジ付き多層容器を成形した後所定
のトリミングを行う脱酸素性多層容器の製造方法であっ
て、フランジ形成部の外周に凸部を設けた容器成形用型
で脱酸素性多層シートを成形することにより容器の成形
と同時に前記凸部で多層シートを圧潰してフランジ部外
周に薄肉部を形成し、裁断工程で前記薄肉部を裁断する
ことを特徴とする脱酸素性多層容器の製造方法。
1. An oxygen-absorbing composition in which a flanged multilayer container is formed by a vacuum forming method from an oxygen-absorbing multilayer sheet having an oxygen-absorbing resin layer containing an oxygen-absorbing composition as an intermediate layer, followed by predetermined trimming. A method for manufacturing a multilayer container, wherein the multilayer sheet is crushed at the convex portion at the same time as the container is formed by molding a deoxidizing multilayer sheet with a container forming mold provided with a convex portion on the outer periphery of the flange forming portion. A method for producing a deoxidized multilayer container, comprising: forming a thin portion on an outer periphery of a flange portion; and cutting the thin portion in a cutting step.
【請求項2】 凸部が上型に設けられた成形用型で成形
することにより多層シートを下層方向に圧潰することを
特徴とする請求項1記載の脱酸素性多層容器の製造方
法。
2. The method for producing a deoxidizable multilayer container according to claim 1, wherein the multilayer sheet is crushed in a lower layer direction by molding with a molding die provided with a convex portion on an upper mold.
【請求項3】 凸部が上型と下型に対峙して設けられた
成形用型で成形することにより多層シートを中間層方向
に圧潰することを特徴とする請求項1記載の脱酸素性多
層容器の製造方法。
3. The deoxidizing property according to claim 1, wherein the multilayer sheet is crushed in the direction of the intermediate layer by molding with a molding die provided with the convex portion facing the upper die and the lower die. A method for manufacturing a multilayer container.
【請求項4】 薄肉部の厚さが10μm以上でかつ多層
シートの厚さの70%以下であることを特徴とする請求
項1記載の脱酸素性多層容器の製造方法。
4. The method according to claim 1, wherein the thickness of the thin portion is 10 μm or more and 70% or less of the thickness of the multilayer sheet.
JP10577597A 1997-04-23 1997-04-23 Method for producing deoxygenating multilayer container Expired - Lifetime JP3838289B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10577597A JP3838289B2 (en) 1997-04-23 1997-04-23 Method for producing deoxygenating multilayer container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10577597A JP3838289B2 (en) 1997-04-23 1997-04-23 Method for producing deoxygenating multilayer container

Publications (2)

Publication Number Publication Date
JPH10296845A true JPH10296845A (en) 1998-11-10
JP3838289B2 JP3838289B2 (en) 2006-10-25

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ID=14416541

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Country Status (1)

Country Link
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003523292A (en) * 2000-02-17 2003-08-05 サルフレックス ポリマーズ リミテッド Flange member with barrier layer
JP2008279685A (en) * 2007-05-11 2008-11-20 Asano Laboratories Co Ltd Vacuum forming method and vacuum forming apparatus of plastic sheet
JP2009107117A (en) * 2009-02-09 2009-05-21 Toyo Seikan Kaisha Ltd Multilayer container molding method
JP2009208807A (en) * 2008-03-03 2009-09-17 Fp Corp Container and method for manufacturing container
JP2017071192A (en) * 2015-10-09 2017-04-13 大日本印刷株式会社 Method for manufacturing storage container
JP2018202794A (en) * 2017-06-08 2018-12-27 株式会社黒岩 Molding method of resin molded product
WO2023228561A1 (en) * 2022-05-23 2023-11-30 株式会社浅野研究所 Thermal molding machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003523292A (en) * 2000-02-17 2003-08-05 サルフレックス ポリマーズ リミテッド Flange member with barrier layer
JP2008279685A (en) * 2007-05-11 2008-11-20 Asano Laboratories Co Ltd Vacuum forming method and vacuum forming apparatus of plastic sheet
JP2009208807A (en) * 2008-03-03 2009-09-17 Fp Corp Container and method for manufacturing container
JP2009107117A (en) * 2009-02-09 2009-05-21 Toyo Seikan Kaisha Ltd Multilayer container molding method
JP2017071192A (en) * 2015-10-09 2017-04-13 大日本印刷株式会社 Method for manufacturing storage container
JP2018202794A (en) * 2017-06-08 2018-12-27 株式会社黒岩 Molding method of resin molded product
WO2023228561A1 (en) * 2022-05-23 2023-11-30 株式会社浅野研究所 Thermal molding machine
JP2023172112A (en) * 2022-05-23 2023-12-06 株式会社浅野研究所 thermoforming machine

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