JPH0257339A - Polyester film for coating interior of metal can and metal can - Google Patents
Polyester film for coating interior of metal can and metal canInfo
- Publication number
- JPH0257339A JPH0257339A JP20860088A JP20860088A JPH0257339A JP H0257339 A JPH0257339 A JP H0257339A JP 20860088 A JP20860088 A JP 20860088A JP 20860088 A JP20860088 A JP 20860088A JP H0257339 A JPH0257339 A JP H0257339A
- Authority
- JP
- Japan
- Prior art keywords
- film
- metal
- acid
- polyester film
- polyester
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 46
- 239000002184 metal Substances 0.000 title claims abstract description 46
- 229920006267 polyester film Polymers 0.000 title claims abstract description 30
- 239000011248 coating agent Substances 0.000 title abstract 2
- 238000000576 coating method Methods 0.000 title abstract 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 11
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920000728 polyester Polymers 0.000 claims abstract description 7
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 7
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 238000001069 Raman spectroscopy Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 15
- 239000000796 flavoring agent Substances 0.000 abstract description 9
- 235000019634 flavors Nutrition 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 3
- MGIAHHJRDZCTHG-UHFFFAOYSA-N benzene-1,3-dicarboxylic acid;terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1.OC(=O)C1=CC=CC(C(O)=O)=C1 MGIAHHJRDZCTHG-UHFFFAOYSA-N 0.000 abstract 1
- 238000010030 laminating Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 235000013305 food Nutrition 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid group Chemical group C(CCCCCCCCC(=O)O)(=O)O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、耐熱性及び保香性（耐）Ｌノーパー性）に優
れた金属缶内装用ポリエステルフィルムに関し、殊に金
属缶製造過程中に遭遇する種々の環境に対して安定であ
り、製品化の内面において剥離やクラック等の欠陥を生
じることが少ない金属缶内装用ポリエステルフィルム及
び該フィルムを内装してなる金属缶に関するものである
。Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a polyester film for interior use in metal cans that has excellent heat resistance and aroma retention (resistance to non-persistent properties). The present invention relates to a polyester film for the interior of a metal can that is stable in various environments encountered and rarely causes defects such as peeling or cracks on the inner surface of the product, and a metal can made of the interior of the film.
［従来の技術］
製缶技術並びに缶用素材技術の進歩により、食料用殊に
飲料用の金属缶の生産は飛躍的な伸びを示している。こ
うした金属缶の材質としては、Ａ１．Ｆｅ及びこの両者
の複合材料であるバイメタル材等が利用さね°ｒおり、
打ち抜き加］二、絞り加工、しごき加工等を駆使して缶
体の製造が行なわれている。こうして得られた金属缶の
内面には、内容物の風味やフレーバーを損なわない様に
、また缶素材の腐食を防止し得る様に内装材が添設され
ている。[Prior Art] Due to advances in can manufacturing technology and can material technology, the production of metal cans for food, especially beverages, has shown dramatic growth. The material for these metal cans is A1. Fe and bimetal materials, which are composite materials of both, are used.
2. Can bodies are manufactured by making full use of drawing, ironing, etc. An interior material is attached to the inner surface of the metal can thus obtained so as not to impair the taste and flavor of the contents and to prevent corrosion of the can material.
金属缶内装材としては、まず毒性がなく、加熱殺菌処理
に耐えることができ、溶出物質量の少ない素材であるこ
とが要求され、さらに金属缶との接着性や加工性が良好
であり、その上で耐フレーバー性に優れたものが求めら
れており、従来、この様な金属缶内装材としてはポリ塩
化ビニル系樹脂が採用され、これをスプレーコーティン
グによって金属缶内面に塗膜する手法が採られていた。Metal can interior materials must first be non-toxic, able to withstand heat sterilization treatment, and have a low amount of eluted substances, as well as having good adhesion and processability to metal cans. As a result, polyvinyl chloride resin has traditionally been used as the interior material for metal cans, and a method of spray coating the interior of metal cans has been adopted. It was getting worse.
しかるにポリ塩化ビニル系樹脂は焼却時に塩素ガスが発
生するという問題があると共にバリヤー性能が不十分で
、且つ衛生性にも問題がある。However, polyvinyl chloride resins have the problem of generating chlorine gas when incinerated, have insufficient barrier performance, and have problems with hygiene.
方スプレーコーティング法自体も、工程的に見てその操
作が煩雑であり、生産コストが高いという欠点がある。The spray coating method itself also has disadvantages in that the operation is complicated and the production cost is high.
こうした理由からポリ塩化ビニル系樹脂のスプレーコー
ティング技術に対しては必らずしも満足が得られている
訳ではなく、これに替わる技術が要望されているのが現
状である。For these reasons, spray coating techniques for polyvinyl chloride resins are not always satisfactory, and an alternative technique is currently desired.
［発明が解決しようとする課題］
本発明者等は、こうした状況のもとで、スプレーコーテ
ィングに替る技術について種々検討を重ねた結果、金属
缶内面にプラスチックフィルムをラミネートするという
方針を立てて見た。しかして該ラミネート用フィルムに
ついては、金属缶内装材用として必要な前記特性の全て
を満足することが要求されるのでその選択が難しく、選
択の如何によって上記方針の成否が左右されるとも言え
る。本発明者等はこれらの条件を満足し、特に食品の風
味やフレーバーを損わず、且つ安価な金属缶内装用フィ
ルムを提供すべく鋭意検討を重ねた結果、本発明を完成
するに至った。[Problems to be Solved by the Invention] Under these circumstances, the inventors of the present invention have repeatedly studied various technologies to replace spray coating, and have decided to laminate a plastic film on the inner surface of a metal can. Ta. However, it is difficult to select the laminating film because it is required to satisfy all of the above-mentioned characteristics necessary for use as an interior material for metal cans, and it can be said that the success or failure of the above policy depends on the selection. The present inventors have completed the present invention as a result of intensive studies to provide a film for the interior of metal cans that satisfies these conditions, does not particularly impair the taste and flavor of foods, and is inexpensive. .
［課題を解決するための手段］
即ち本発明は、酸成分が、テレフタル酸：５０〜９５モ
ル％、イソフタル酸及び／又はオルソフタル酸：５０〜
５モル％からなり、グリコール成分が、炭素数２〜５の
グリコールからなるポリエステル原料によって形成され
、２１０℃、２分の温度条件下で熱処理したときのＭｉ
ｃｒｏＲａｍａｎ法による比重が１３５０以下である点
に要旨を有する金属缶内装用ポリエステルフィルム及び
該フィルムを内装してなる金属缶を提供するものである
。[Means for Solving the Problems] That is, in the present invention, the acid component is terephthalic acid: 50 to 95 mol%, isophthalic acid and/or orthophthalic acid: 50 to 95 mol%.
5 mol%, the glycol component is formed from a polyester raw material consisting of glycol having 2 to 5 carbon atoms, and when heat treated at 210°C for 2 minutes, Mi
The object of the present invention is to provide a polyester film for the interior of a metal can, which has a specific gravity of 1350 or less as determined by the croRaman method, and a metal can formed with the interior of the film.
［作用］
スプレーコーティング法の場合には、製缶後の缶内面に
ポリ塩化ビニル樹脂等のスプレーコーティングを行なっ
ていたので金属缶１個毎にスプレー操作を行なわなけれ
ばならず生産性の向上には限界がある。これに対し金属
缶内面にフィルムをラミネートする場合には缶形状に成
形する前の金属板にフィルムをラミネートした後製缶工
程に入るという手法を採用することができるので、操作
は大幅に簡素化されて生産性を高めることができ、金属
缶内面への内装材の添設を経済的に実施することができ
るとの期待が持たれた。尚金属板へフィルムをラミネー
トする技術そのものについては、金属板製造の過程でラ
ミネートするか、あるいは金属板を製造した後、別工程
でフィルムをラミネートするかは自由である。[Function] In the case of the spray coating method, since the inner surface of the can is spray-coated with polyvinyl chloride resin, etc. after the can is made, the spray operation must be performed for each metal can, which improves productivity. has its limits. On the other hand, when laminating a film on the inside of a metal can, it is possible to use a method in which the film is laminated to a metal plate before being formed into a can shape, and then the can-making process is started, which greatly simplifies the operation. It was hoped that this would improve productivity and make it possible to economically attach interior materials to the inner surface of metal cans. As for the technique for laminating the film onto the metal plate, it is up to you whether to laminate it during the process of manufacturing the metal plate or to laminate the film in a separate process after manufacturing the metal plate.
ところがこの様にラミネートされたフィルムは、金属板
と一緒になって製缶工程中の過酷な変形加工を受け、更
に金属板の塑性変形に伴なって発生する熱或は金属缶外
面への印刷の際及び食品殺菌処理の際の高熱を受ける。However, the film laminated in this way is subjected to severe deformation processing during the can manufacturing process together with the metal plate, and is also subject to heat generated due to plastic deformation of the metal plate or printing on the outer surface of the metal can. exposed to high heat during food processing and food sterilization.
その為、これらの工程を通過してもフィルムの特性が劣
化しないことが要求される。換言すれば製缶、印刷、殺
菌処理等の諸工程を通過した後においても十分な耐フレ
ーバー性３缶内面との接着性、防食の為の保護性等を備
えていることが重要となる。Therefore, it is required that the properties of the film do not deteriorate even after passing through these steps. In other words, it is important to have sufficient flavor resistance, adhesion to the inner surface of the can, protection against corrosion, etc. even after passing through various processes such as can manufacturing, printing, and sterilization.
こうした観点から種々のプラスチックフィルムについて
、各特性の安定性について検討したが、ポリオレフィン
やポリアマイドなどの多くの汎用素材は耐熱性や保香性
の点で不十分であり、ポリエステルフィルムが最適であ
ることを確認した。From this perspective, we investigated the stability of each property of various plastic films, but found that many general-purpose materials such as polyolefin and polyamide are insufficient in terms of heat resistance and fragrance retention, and that polyester film is optimal. It was confirmed.
ところで金属板にポリエステルフィルムをラミネートす
るに当たっては、接着剤を使用したときは接着剤の毒性
や耐熱性等が問題となり、接着力の経時低下によるラミ
ネートフィルムの剥離といった事態も考えられる。又接
着剤を使用すれば当然ラミネートコストが上昇すること
にもなる。By the way, when laminating a polyester film on a metal plate, when an adhesive is used, the toxicity and heat resistance of the adhesive become a problem, and the laminate film may peel off due to a decrease in adhesive strength over time. Furthermore, the use of adhesives naturally increases lamination costs.
そこで本発明では接着剤を使用することなく、即ち金属
缶内面に融着することができるラミネート用フィルムで
あることを基準としてポリエステルフィルムを選択する
こととした。そして種々のポリエステルフィルムを金属
板に融着してみると、多くのポリエステルフィルムは融
点に近い温度で金属板にラミネート（融りすることので
きることが確認され、中でも非晶質性であることが穆々
の観点から好ましいことが分かった。Therefore, in the present invention, a polyester film was selected based on the fact that it is a laminating film that can be fused to the inner surface of a metal can without using an adhesive. When various polyester films were fused to metal plates, it was confirmed that many polyester films could be laminated (melted) to metal plates at temperatures close to their melting points, and it was found that they were amorphous. It turned out to be favorable from a moral point of view.
即ち結晶性ポリエステルの場合は、ラミネートしたとき
には結晶性が崩れて非晶質状態になっているが、製缶、
印刷、加熱殺菌などの工程で熱を受けると結晶化が進み
、ラミネートしたフィルムがもろくなって剥離したり、
クラックを発生することが分かった。そこで本発明では
製缶工程以降の熱履歴によってフィルム特性が劣化する
ことのない様に結晶化の問題のない非品性ポリエステル
乃至結晶性の低いポリニスデルを求めて更に研究を重ね
た結果、前記構成で示される本発明の金属缶内装用ポリ
エステルフィルムを完成するに至った。In other words, in the case of crystalline polyester, when it is laminated, its crystallinity collapses and it becomes an amorphous state.
When exposed to heat during processes such as printing and heat sterilization, crystallization progresses, causing the laminated film to become brittle and peel off.
It was found that cracks were generated. Therefore, in the present invention, as a result of further research in search of a non-grade polyester with no crystallization problem or a polynisdel with low crystallinity, in order to prevent the film properties from deteriorating due to heat history after the can manufacturing process, we found that the above structure A polyester film for the interior of metal cans according to the present invention as shown in the figure has been completed.
以下実験説明を混じえて本発明をさらに詳細に説明する
。まずフィルムの基本的特性として食品の風味やフレー
バーを保持する性能に優れていることが重要であり、こ
れを備えたポリエステルフィルムを見出すべく、種々の
ポリエステルの保香性を調べたところ第１表に示す結果
が得られこの実験結果より酸成分がＴＰＡあるいはＴＰ
ＡとＩＰＡの混合物であり、グリコール成分がＥＧ、Ｐ
Ｇ、１．４−ＢＧから選ばれる１種以上の成分であるポ
リエステルフィルムの場合は特に耐フレーバー性に優れ
ていることが分かった。The present invention will be explained in more detail below along with experimental explanations. First of all, as a basic property of a film, it is important that it has excellent performance in retaining the taste and flavor of food, and in order to find a polyester film that has this property, we investigated the aroma retention properties of various polyesters and found the results shown in Table 1. The results shown are obtained, and from this experimental result, the acid component is TPA or TP.
It is a mixture of A and IPA, and the glycol components are EG and P.
It has been found that a polyester film containing one or more components selected from G, 1.4-BG, and 1.4-BG has particularly excellent flavor resistance.
これに対し、酸成分がセバシン酸であるポリエステルや
グリコール成分が１．６−ＨＤであるポリエステルフィ
ルムは耐フレーバー性の観点から排除されるべきである
ことが分かった。On the other hand, it has been found that polyester films whose acid component is sebacic acid and polyester films whose glycol component is 1.6-HD should be excluded from the viewpoint of flavor resistance.
一方上記耐フレーバー性の良好なポリエステルフィルム
の中でも、酸成分がＴＰＡ１００％であり、共重合成分
としてＩＰＡ等を全く含まないポリエステルフィルムは
、結晶性が強く、ラミネート後の熱環境によって結晶化
が進み、７１」離やクラックを発生し易い。従ってラミ
ネート後の熱劣化等を考慮すれば、酸成分がＴＰＡ＄独
であるポリエステルフィルムを採用することはできない
。On the other hand, among the above-mentioned polyester films with good flavor resistance, polyester films whose acid component is 100% TPA and which do not contain any copolymer components such as IPA have strong crystallinity, and crystallization progresses due to the thermal environment after lamination. , 71'' is prone to peeling and cracking. Therefore, in consideration of thermal deterioration after lamination, etc., a polyester film containing only TPA$ as an acid component cannot be used.
又本発明に係るポリエステルフィルムは、金属板に対し
て融着する必要があるので、融着温度（−般に２００〜
２４０℃）で分解せず安定した品質を保つものでなけれ
ばならない。もっともある程度融解しなければ融着その
ものが不可能あるいは不安定になるので融点は２４０℃
以下であることが望ましい。In addition, since the polyester film according to the present invention needs to be fused to a metal plate, the fusion temperature (generally 200 to
It must maintain stable quality without decomposing at temperatures (240°C). However, unless it melts to a certain extent, the fusion itself will be impossible or unstable, so the melting point is 240℃.
The following is desirable.
こうした諸要求を満足するポリエステルフィルムについ
て検討を重ねた結果、前記構成に示される様に酸成分が
、テレフタル酸：５０〜９５モル％、イソフタル酸及び
／又はオルソフタル酸：５０〜５モル％からなり、グリ
コール成分が、炭素数２〜５のグリコールであるポリエ
ステルフィルムが上記要求に適合するうものであること
が分かった。但し上記要求を満足するだけでは酸成分と
グリコール成分の組合せ及び組成によっては製缶工程以
降の熱環境下において結晶化度が高くなりすぎる恐れが
あるので、結晶化度は上記酸成分とグリコール成分の配
合比を上記配合比率の範囲内で適宜調整しなければなら
ない。そしてこう１ノた配合比調整の尺度となるのが下
記熱処理条件でポリエステルフィルムを処理したときの
比重（Ｍｉｃｒｏ Ｒａｍａｎ法で測定）である。As a result of repeated studies on a polyester film that satisfies these various requirements, we found that the acid component consists of 50 to 95 mol% of terephthalic acid and 50 to 5 mol% of isophthalic acid and/or orthophthalic acid, as shown in the above composition. It has been found that a polyester film in which the glycol component is a glycol having 2 to 5 carbon atoms satisfies the above requirements. However, if only the above requirements are satisfied, depending on the combination and composition of the acid component and glycol component, the degree of crystallinity may become too high in the thermal environment after the can manufacturing process. The blending ratio must be appropriately adjusted within the range of the above blending ratio. The specific gravity (measured by Micro Raman method) when a polyester film is treated under the following heat treatment conditions is a measure for adjusting the blending ratio.
熱処理条件２１０℃×２分
即ち本発明に係るポリエステルフィルムは、上記熱処理
後の比重が１．’３５０以下であることが不可欠であり
、該比重が１．３５０を超えると、製缶工程以降の熱環
境において結晶化が過度に進行し、材質の劣化を引き起
こす。Heat treatment conditions: 210°C x 2 minutes, that is, the polyester film according to the present invention has a specific gravity of 1. It is essential that the specific gravity be below 1.350, and if the specific gravity exceeds 1.350, crystallization will proceed excessively in the thermal environment after the can manufacturing process, causing deterioration of the material.
本発明の基本構成は以上の通りであるが、フィルム製造
工程及び金属板へのラミネート工程における加工性を上
げることを目的として炭酸カルシウムやサイロイドなど
の滑剤を添加したり、必要に応じて金属板に対する接着
性を改良する目的でフィルムの片面にコロナ放電処理や
化学処理などの表面処理を施してもよい、更にポリエス
テル改良剤などの添加剤を加えることも許される。The basic structure of the present invention is as described above, but lubricants such as calcium carbonate and siloid may be added for the purpose of improving workability in the film manufacturing process and the laminating process to metal plates, and metal plates may be laminated as necessary. Surface treatments such as corona discharge treatment or chemical treatment may be applied to one side of the film for the purpose of improving adhesion to the film, and additives such as polyester modifiers may also be added.
尚通常のポリエステルフィルムではレトルト処理（１３
０℃Ｘ３０分）をすると白化するなどの問題が発生する
が、この対策としてコポリエステルを添加すると白化の
問題が解決する。It should be noted that ordinary polyester film requires retort treatment (13
0° C. for 30 minutes), problems such as whitening occur, but adding copolyester as a countermeasure solves the problem of whitening.
又本発明に係るポリエステルフィルムは、−軸方向さら
には２軸方向に延伸されたものであることが望ましく、
延伸方向と製缶時のフィルム変形方向を一致させること
によって製缶時のフィルム損傷を減少させることができ
る。さらにフィルムの厚みは９〜５０μｍ最も好ましく
は２０〜２５μｍとすることが望まれ、９μｍ未満では
フィルム厚さが小さすぎる為に製缶加工時に破れ等が生
じ易くなる。一方５０μｍを超えるのは過剰品質であり
不経済である。Further, the polyester film according to the present invention is preferably stretched in the -axial direction or even in the biaxial direction,
By matching the stretching direction with the direction of film deformation during can manufacturing, damage to the film during can manufacturing can be reduced. Further, the thickness of the film is desirably 9 to 50 μm, most preferably 20 to 25 μm; if it is less than 9 μm, the film thickness is too small and tends to tear during can manufacturing. On the other hand, a thickness exceeding 50 μm is excessive quality and uneconomical.
又、本発明ポリエステルフィルムの添設対象となる金属
缶の材質としては前述のＡＩ、Ｆｅ及びこれらのバイメ
タル材等が例示され、その内面に前述の工程に従い本発
明フィルムを添設することによって本発明金属缶を得る
ことができる。尚金属缶素材の外面相当側には絞り加工
等の際の加工性を向上させる目的でＳｎめっき等を施し
ておくことが推奨される。In addition, examples of the material of the metal can to which the polyester film of the present invention is attached include the aforementioned AI, Fe, and their bimetallic materials, and by attaching the film of the present invention to the inner surface of the can according to the steps described above, Inventive metal cans can be obtained. It is recommended that the outer surface of the metal can material be coated with Sn plating or the like for the purpose of improving workability during drawing or the like.
［実施例］
（ｉ） ホモポリマー：ＴＰＡ／ＥＧ＝１００ ／１
０（１（重量部）
（１１） コポリマー：ＴＰＡ／Ｉ ＰＡ／ＥＧ＝
７８／２２／１０Ｇ（重量部）
（ｉｉｉ） Ｔ ＰＡ／ Ｉ Ｐ Ａ／Ｅ Ｇ＝ ７
ａ／ ２２／１ｏｏ（Ｄｉ重量部のコポリマーからなる
２軸延伸フイルム
上記（ｉ）〜（ｉｉ）のポリマー若しくは（ＩＩＩ）の
フィルムの比！！！（Ｓ、Ｇ）を旧ｃｒｏ Ｒａｎｎ
ａｎ法によって測定したところ、第２表に示す結果が得
られた。[Example] (i) Homopolymer: TPA/EG=100/1
0 (1 (parts by weight) (11) Copolymer: TPA/I PA/EG=
78/22/10G (parts by weight) (iii) T PA/ I PA/E G= 7
Biaxially oriented film made of a copolymer of a/22/1oo (Di parts by weight) The ratio of the above polymers (i) to (ii) or the film of (III)!!! (S, G) is the former cro Rann
When measured by the AN method, the results shown in Table 2 were obtained.
次に種々の組成のポリエステルフィルム及び該フィルム
を下記条件で熱処理して得たフィルムの比重を同様に測
定したところ第３表に示す結果が得られた。Next, the specific gravity of polyester films of various compositions and films obtained by heat-treating the films under the following conditions were measured in the same manner, and the results shown in Table 3 were obtained.
熱処理条件２１０℃×２分
（以下余白）
［発明の効果］
本発明は以上の様に構成されており、金属板に対して融
着することができ、製缶工程における絞り加工に際して
も破損することなく変形に追従することができ、製缶工
程以降の熱環境によって剥離やクラックを起こすことの
ない耐フレーバー性に優れたポリエステルフィルム並び
に該フィルムを内装した金属缶を提供することができる
。かくして従来のスプレーコーティングに代えてフィル
ムラミネートによる金属缶内装技術を実用化することが
可能となり、金属缶の生産コストを低減することができ
た。Heat treatment conditions: 210°C x 2 minutes (blank below) [Effects of the invention] The present invention is configured as described above, and can be fused to a metal plate and will not be damaged during drawing in the can manufacturing process. It is possible to provide a polyester film that can follow deformation without causing any deformation and has excellent flavor resistance without peeling or cracking due to the thermal environment after the can manufacturing process, and a metal can equipped with the film. In this way, it has become possible to put into practical use metal can interior technology using film lamination instead of conventional spray coating, and the production cost of metal cans has been reduced.
Claims (2)
ソフタル酸及びイ又はオルソフタル酸：５０〜５モル％
からなり、 グリコール成分が、炭素数２〜５のグリコールからなる
ポリエステル原料によって形成され、２１０℃、２分の
温度条件下で熱処理した後のマイクロラマン法による比
重が１．３５０以下であることを特徴とする金属缶内装
用ポリエステルフィルム。(1) Acid components include terephthalic acid: 50 to 95 mol%, isophthalic acid and orthophthalic acid: 50 to 5 mol%
The glycol component is formed from a polyester raw material consisting of glycol having 2 to 5 carbon atoms, and the specific gravity by micro-Raman method after heat treatment at 210°C for 2 minutes is 1.350 or less. Characteristic polyester film for the interior of metal cans.
なる金属缶。(2) A metal can having an interior lined with the polyester film according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63208600A JP2621406B2 (en) | 1988-08-22 | 1988-08-22 | Polyester film for metal can interior and metal can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63208600A JP2621406B2 (en) | 1988-08-22 | 1988-08-22 | Polyester film for metal can interior and metal can |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0257339A true JPH0257339A (en) | 1990-02-27 |
| JP2621406B2 JP2621406B2 (en) | 1997-06-18 |
Family
ID=16558892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63208600A Expired - Lifetime JP2621406B2 (en) | 1988-08-22 | 1988-08-22 | Polyester film for metal can interior and metal can |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2621406B2 (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0671747A (en) * | 1992-08-31 | 1994-03-15 | Teijin Ltd | Polyester film for laminating metallic sheet |
| JPH07117120A (en) * | 1993-10-26 | 1995-05-09 | Toray Ind Inc | Metal sticking film |
| JPH07195617A (en) * | 1993-12-28 | 1995-08-01 | Toyo Seikan Kaisha Ltd | Drawing squeeze can and resin coated metal panel therefor |
| EP0688813A1 (en) | 1994-06-24 | 1995-12-27 | Toray Industries, Inc. | A polyester film for thermal lamination |
| JPH081863A (en) * | 1994-06-24 | 1996-01-09 | Toray Ind Inc | Polymer-coated metal laminate |
| WO1996002387A1 (en) * | 1994-07-19 | 1996-02-01 | Teijin Limited | Laminated polyester film for metallic lamination |
| JPH08104743A (en) * | 1994-10-05 | 1996-04-23 | Mitsubishi Chem Corp | Copolyester |
| EP0712720A2 (en) | 1994-10-18 | 1996-05-22 | Teijin Limited | Laminated polyester film to be laminated on metal plate |
| US5780158A (en) * | 1996-02-09 | 1998-07-14 | Teijin Limited | Biaxially oriented film to be laminated on a metal |
| US5874163A (en) * | 1993-12-06 | 1999-02-23 | Teijin Limited | Laminated polyester film to be laminated on metal plate |
| US5876851A (en) * | 1993-05-19 | 1999-03-02 | Teijin Limited | Film from polycarbonate, polyester to be laminated on metal |
| US6071599A (en) * | 1996-09-18 | 2000-06-06 | Teijin Limited | Polyester film for metal lamination and the use thereof |
| EP1186405A1 (en) * | 2000-08-04 | 2002-03-13 | Mitsubishi Polyester Film GmbH | Coextruded, biaxially oriented polyester film with good metal adhesion, its use, and process for its production |
| US6372326B1 (en) | 1998-04-13 | 2002-04-16 | Teijin Limited | Biaxially oriented polyester film to be molded and laminated on metal sheet |
| US6420010B1 (en) | 1996-10-18 | 2002-07-16 | Teijin Limited | White laminated polyester film for metallic plate lamination work |
| US6617006B1 (en) | 2000-01-07 | 2003-09-09 | Teijin Limited | Biaxially oriented polyester film to be laminated on a metal plate and molded |
| WO2004103697A1 (en) * | 2003-05-22 | 2004-12-02 | Jfe Steel Corporation | Laminated metal sheet for can |
| JP2017056692A (en) * | 2015-09-18 | 2017-03-23 | 大日本印刷株式会社 | Laminate |
| JP2017056693A (en) * | 2015-09-18 | 2017-03-23 | 大日本印刷株式会社 | Laminate |
| EP3473436A4 (en) * | 2016-06-17 | 2020-03-04 | JFE Steel Corporation | Laminate metal plate for metal container lid and method for manufacturing same |
| JP2020114754A (en) * | 2015-09-18 | 2020-07-30 | 大日本印刷株式会社 | Laminate |
| JP2020142529A (en) * | 2015-09-18 | 2020-09-10 | 大日本印刷株式会社 | Laminate |
| JP2020142528A (en) * | 2015-09-18 | 2020-09-10 | 大日本印刷株式会社 | Laminate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416556A (en) * | 1977-07-08 | 1979-02-07 | Miyoshi Yushi Kk | Polyvinyle chloride improved processability |
| JPS5959435A (en) * | 1982-09-30 | 1984-04-05 | 藤森工業株式会社 | Composite packing material |
| JPH01192545A (en) * | 1988-01-28 | 1989-08-02 | Nippon Steel Corp | Laminated steel plate for can excellent in processability and corrosion resistance |
-
1988
- 1988-08-22 JP JP63208600A patent/JP2621406B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416556A (en) * | 1977-07-08 | 1979-02-07 | Miyoshi Yushi Kk | Polyvinyle chloride improved processability |
| JPS5959435A (en) * | 1982-09-30 | 1984-04-05 | 藤森工業株式会社 | Composite packing material |
| JPH01192545A (en) * | 1988-01-28 | 1989-08-02 | Nippon Steel Corp | Laminated steel plate for can excellent in processability and corrosion resistance |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0671747A (en) * | 1992-08-31 | 1994-03-15 | Teijin Ltd | Polyester film for laminating metallic sheet |
| US5876851A (en) * | 1993-05-19 | 1999-03-02 | Teijin Limited | Film from polycarbonate, polyester to be laminated on metal |
| JPH07117120A (en) * | 1993-10-26 | 1995-05-09 | Toray Ind Inc | Metal sticking film |
| US5874163A (en) * | 1993-12-06 | 1999-02-23 | Teijin Limited | Laminated polyester film to be laminated on metal plate |
| JPH07195617A (en) * | 1993-12-28 | 1995-08-01 | Toyo Seikan Kaisha Ltd | Drawing squeeze can and resin coated metal panel therefor |
| EP0688813A1 (en) | 1994-06-24 | 1995-12-27 | Toray Industries, Inc. | A polyester film for thermal lamination |
| JPH081863A (en) * | 1994-06-24 | 1996-01-09 | Toray Ind Inc | Polymer-coated metal laminate |
| US5814385A (en) * | 1994-07-19 | 1998-09-29 | Teijin Limited | Laminated polyester film to be laminated onto metal plate |
| WO1996002387A1 (en) * | 1994-07-19 | 1996-02-01 | Teijin Limited | Laminated polyester film for metallic lamination |
| JPH08104743A (en) * | 1994-10-05 | 1996-04-23 | Mitsubishi Chem Corp | Copolyester |
| US5776616A (en) * | 1994-10-18 | 1998-07-07 | Teijin Limited | Laminated polyester film to be laminated on metal plate |
| EP0712720A2 (en) | 1994-10-18 | 1996-05-22 | Teijin Limited | Laminated polyester film to be laminated on metal plate |
| US5780158A (en) * | 1996-02-09 | 1998-07-14 | Teijin Limited | Biaxially oriented film to be laminated on a metal |
| US6071599A (en) * | 1996-09-18 | 2000-06-06 | Teijin Limited | Polyester film for metal lamination and the use thereof |
| US6420010B1 (en) | 1996-10-18 | 2002-07-16 | Teijin Limited | White laminated polyester film for metallic plate lamination work |
| US6372326B1 (en) | 1998-04-13 | 2002-04-16 | Teijin Limited | Biaxially oriented polyester film to be molded and laminated on metal sheet |
| US6617006B1 (en) | 2000-01-07 | 2003-09-09 | Teijin Limited | Biaxially oriented polyester film to be laminated on a metal plate and molded |
| EP1186405A1 (en) * | 2000-08-04 | 2002-03-13 | Mitsubishi Polyester Film GmbH | Coextruded, biaxially oriented polyester film with good metal adhesion, its use, and process for its production |
| US6607815B2 (en) | 2000-08-04 | 2003-08-19 | Mitsubishi Polyester Film Gmbh | Coextruded, biaxially oriented polyester film with good metal adhesion and process for its production |
| WO2004103697A1 (en) * | 2003-05-22 | 2004-12-02 | Jfe Steel Corporation | Laminated metal sheet for can |
| JP2017056692A (en) * | 2015-09-18 | 2017-03-23 | 大日本印刷株式会社 | Laminate |
| JP2017056693A (en) * | 2015-09-18 | 2017-03-23 | 大日本印刷株式会社 | Laminate |
| JP2020114754A (en) * | 2015-09-18 | 2020-07-30 | 大日本印刷株式会社 | Laminate |
| JP2020142529A (en) * | 2015-09-18 | 2020-09-10 | 大日本印刷株式会社 | Laminate |
| JP2020142528A (en) * | 2015-09-18 | 2020-09-10 | 大日本印刷株式会社 | Laminate |
| EP3473436A4 (en) * | 2016-06-17 | 2020-03-04 | JFE Steel Corporation | Laminate metal plate for metal container lid and method for manufacturing same |
| US11518144B2 (en) | 2016-06-17 | 2022-12-06 | Jfe Steel Corporation | Laminated metal sheet for metal container lid and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2621406B2 (en) | 1997-06-18 |
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