JP4865170B2 - Aluminum foil press molding lubricant, method for molding food packaging material using the same, and molded food packaging container - Google Patents
Aluminum foil press molding lubricant, method for molding food packaging material using the same, and molded food packaging container Download PDFInfo
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- 239000000314 lubricant Substances 0.000 title claims description 54
- 239000011888 foil Substances 0.000 title claims description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 44
- 229910052782 aluminium Inorganic materials 0.000 title claims description 44
- 238000000465 moulding Methods 0.000 title claims description 44
- 235000013305 food Nutrition 0.000 title claims description 19
- 239000005003 food packaging material Substances 0.000 title claims description 9
- 238000004806 packaging method and process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 title claims description 6
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 claims description 20
- 229940057995 liquid paraffin Drugs 0.000 claims description 16
- 150000004671 saturated fatty acids Chemical class 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 150000004667 medium chain fatty acids Chemical class 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- 235000019198 oils Nutrition 0.000 description 9
- 229910000838 Al alloy Inorganic materials 0.000 description 8
- -1 fatty acid triglycerides Chemical class 0.000 description 8
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 239000002778 food additive Substances 0.000 description 4
- 235000013373 food additive Nutrition 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003925 fat Substances 0.000 description 3
- 235000019197 fats Nutrition 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- TVQGDYNRXLTQAP-UHFFFAOYSA-N ethyl heptanoate Chemical compound CCCCCCC(=O)OCC TVQGDYNRXLTQAP-UHFFFAOYSA-N 0.000 description 2
- SHZIWNPUGXLXDT-UHFFFAOYSA-N ethyl hexanoate Chemical compound CCCCCC(=O)OCC SHZIWNPUGXLXDT-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 235000003441 saturated fatty acids Nutrition 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VMPHSYLJUKZBJJ-UHFFFAOYSA-N trilaurin Chemical compound CCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCC)COC(=O)CCCCCCCCCCC VMPHSYLJUKZBJJ-UHFFFAOYSA-N 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 235000019484 Rapeseed oil Nutrition 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007416 differential thermogravimetric analysis Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- YYZUSRORWSJGET-UHFFFAOYSA-N ethyl octanoate Chemical compound CCCCCCCC(=O)OCC YYZUSRORWSJGET-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229960002446 octanoic acid Drugs 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000015277 pork Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- LADGBHLMCUINGV-UHFFFAOYSA-N tricaprin Chemical compound CCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCC)COC(=O)CCCCCCCCC LADGBHLMCUINGV-UHFFFAOYSA-N 0.000 description 1
- VLPFTAMPNXLGLX-UHFFFAOYSA-N trioctanoin Chemical compound CCCCCCCC(=O)OCC(OC(=O)CCCCCCC)COC(=O)CCCCCCC VLPFTAMPNXLGLX-UHFFFAOYSA-N 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Lubricants (AREA)
Description
【０００１】
【発明の属する技術分野】
アルミニウムもしくはアルミニウム合金箔、これらに樹脂をコートしたものまたはこれらとプラスチックフィルムを積層した複合箔（以下これらを一括して「アルミニウム箔等」と言う。）のプレス成形に使用する潤滑剤、特にアルミニウム箔などの食品包装材へのプレス成形に使用する潤滑剤並びにそれを用いた食品包装材の成形方法および食品包装用容器に関する。
【０００２】
【従来の技術】
アルミニウム箔等の金属箔を含む材料を各種形状にプレス成形する場合、特にグラタン皿、ケーキ皿、鍋焼きうどん用鍋など食品用容器を成形する場合にアルミニウム箔など材料と金型の間の滑り性を向上させ、材料の破断および成形性の向上を目的として通常潤滑剤をコートして行う。このような成形品の内、食品用の包装材として使用される潤滑剤は食用或いは食品添加剤として認可されているものを使用すべきである。従って、通常は流動パラフィン、シリコーン、高級脂肪酸のトリグリセライド（食品用油脂）などが主として使用されてきた。
特に食品包装材の成形用潤滑剤として、食品用油脂が使用されてきた。食品用油脂としては大豆油、綿実油、菜種油、オリーブ油などの液状植物油、椰子油、牛脂、豚油などの固体油脂が各種用途に使用されているが、固体であったり、分子内に不飽和結合を有し、酸化重合し、劣化するなどの欠点があった。
【０００３】
アルミニウム箔プレス成形用潤滑剤としては、適度の粘性、成形性（滑り性）、揮発性が必要である。
潤滑剤として粘性がないときは、潤滑剤の塗膜強度も低下して成形性が悪くなり、また粘性が高いときにはべとつくためワークの連続供給時に余分なワークが重なって供給されたり、プレス屑やゴミなどが付着し易い等の問題がある。滑り性が低いと加工時にワークの破断などが起きやすく、そのため加工限度を低下させることになる。潤滑剤は蒸発潜熱が小さく揮発性の高いものが望まれる。これはプレス後の製品から潤滑剤を除去する際に余分な加熱などを削減するためにできるだけ揮発性の高い潤滑剤が求められている。
【０００４】
例えば、流動パラフィンは粘度が低く滑り性が悪いため、成形性が不十分である。
一方シリコーンは滑り性が良く好ましいが、粘度が高くべとつき、ワークの連続供給などに困難性があり、また製品からの除去が困難であり潤滑剤としては不十分であった。
高級脂肪酸トリグリセライドは粘度が高く、飽和高級脂肪酸系のものは常温で固体であり、一方不飽和脂肪酸系のものは液体ではあるが酸化劣化し易いため使用するには安定性に欠けている。
従ってこれまで提案され、或いは使用されてきた潤滑剤の中には、食品或いは食品添加剤として認可されており、かつ上記のすべての要求された性能を満足できるアルミニウム箔プレス成形用潤滑剤はなかった。
【０００５】
【発明が解決しようとする課題】
本発明は、食料又は食品として認可されているものの内で、アルミニウム箔プレス成形用潤滑剤に適した適度の粘性を有し、塗膜強度および成形性が高く、成形品の表面状態に優れたプレス成形用潤滑剤、それを用いたアルミニウム箔プレス成形および食品包装用容器の開発を目的とするものである。
【０００６】
【課題を解決するための手段】
本発明は、
［１］ 炭素数６ないし１２の飽和脂肪酸トリグリセライド（以下単に「中鎖脂肪酸トリグリセライド」という。）を含有する液状組成物であるアルミニウム箔プレス成形用潤滑剤、
［２］ 中鎖脂肪酸トリグリセライドに流動パラフィンを配合したアルミニウム箔プレス成形用潤滑剤、
［３］ 中鎖脂肪酸トリグリセライド１０〜６０重量部に流動パラフィン９０〜４０重量部を配合した上記［２］に記載のアルミニウム箔プレス成形用潤滑剤、
［４］ 摩擦係数μが０．１６以下、耐圧力２．５ｋｇ／ｃｍ2以上、４０℃における粘度３０ｃｓｔ以下、凝固点ー５℃以下の上記［１］〜［３］のいずれかに記載のアルミニウム箔プレス成形用潤滑剤、
【０００７】
［５］ アルミニウム箔に、中鎖脂肪酸トリグリセライドを含む上記［１］〜［４］のいずれかに記載の潤滑剤を塗布してプレス成形を行うことを特徴とするアルミニウム箔プレス成形方法、
［６］ アルミニウム箔に、上記［１］〜［４］のいずれかに記載の潤滑剤を、０．１〜０．５ｇ／ｍ2塗布してプレス成形を行うことを特徴とする食品包装材の成形方法、および
［７］ アルミニウム箔に、上記［１］〜［４］のいずれかに記載の潤滑剤を塗布してプレス成形により成形された食品包装用容器、を開発することにより上記の目的を達成した。
【０００８】
【発明の実施の形態】
本発明の潤滑剤を使用するプレス成形の対象とする成形品は、アルミニウム箔等を材料とし、プレス成形により製造される成形品であればすべて対象とすることができる。特に本発明の潤滑剤はすべて食料又は食品添加剤として認可されているものであるので、グラタン皿、ケーキ皿、鍋焼きうどん用鍋、その他食品用のアルミニウム箔製の各種容器等の食品包装材に用いることができる。
【０００９】
本発明においてアルミニウム箔等におけるアルミニウムとしては、１０００番系の純アルミニウム系およびアルミニウム合金を意味し、好ましくはアルミニウム単体の容器には純アルミニウム系および３０００番系、５０００番系のアルミニウム合金（特に３００４番アルミニウム合金が好ましい）が、またコーティングやフィルムラミネートアルミニウム箔の場合には１０００番系や５０００番系のアルミニウム合金箔が用いられている。
これらアルミニウム箔等は、アルミニウム箔、アルミニウム合金箔、あるいはそれらに耐熱性の樹脂コートおよび／またはポリエチレン、ポリプロピレン或いはポリエステルなどのプラスチックフィルムと積層された複合アルミニウム箔であっても構わない。これらはすべて従来と同様にＯ材として使用することが望ましい。
この箔の厚さは、容器など成形品のサイズにより変わるが、一般的に言えばアルミニウム箔単体であるときは約３０〜１２０μｍ、樹脂コーティング箔の場合には約３０〜１５０μｍのアルミニウム箔の表面にエポキシ樹脂などの耐熱性、耐食性の０．５〜１０μｍの樹脂をコートし、内面になる他の表面にヒートシール用の樹脂を３〜１５μｍコートしたものを用いることができる。ヒートシール用の樹脂としては塩酢ビ・酸変性オレフィンなどのコーティングあるいはポリエチレン、エチレン−酢酸ビニル共重合体等のフィルムを用いることもできる。
【００１０】
本発明のプレス用潤滑剤として使用されるものは、場合によっては食品包装用容器の成形に使用することを考慮し、すべて食品或いは食品衛生法の食品添加物として認可されているものである。そしてアルミニウム箔プレス成形用潤滑剤として、適度の粘性、成形性（滑り性）、蒸発潜熱が小さく揮発性の高いものである
【００１１】
すなわち、本発明の潤滑剤はすべて中鎖脂肪酸トリグリセライドを含むものである。ここで中鎖脂肪酸とは炭素数６ないし１２の飽和脂肪酸、すなわち、カプロン酸、カプリン酸、カプリル酸、ラウリン酸を意味する。不飽和脂肪酸のトリグリセライドは、常温であっても空気中において酸化され、重合して変色したり臭気がするなどの難点があるので好ましくない。
【００１２】
中鎖脂肪酸のうち、ラウリン酸のトリグリセライドは、それ単独では常温固体であるので単独状態での使用は好ましくなく、他の中鎖脂肪酸トリグリセライドと混合して液状となっている場合には使用できる。特に好ましいのはカプリル酸のトリグリセライド、カプリン酸のトリグリセライドである。
本発明の潤滑剤としてはこの中鎖脂肪酸トリグリセライドを主体とするか、または流動パラフィンと中鎖脂肪酸トリグリセライドを少なくとも１０重量％以上、好ましくは２０重量％以上含むものである。いずれの場合も少量の高級脂肪酸トリグリセライドを含んでいても液状であれば使用できるが、粘度が高くなるのでできれば避けるのが望ましい。
中鎖脂肪酸トリグリセライドは、粘度は流動パラフィンよりは若干高く、揮発性も若干劣るが、潤滑剤としては極めてバランスのとれた性能を有することを見出し本発明に到達した。
【００１３】
上記の中鎖脂肪酸グリセライドは、
・凝固点が−５℃以下で常温で液状であり、コート剤として適していること（ラウリン酸トリグリセライドを除く）、
・不飽和結合を含まず飽和脂肪酸だけから構成されているため、常温では酸化、重合せず保存安定性に優れていること、
・殆ど無味、無臭であること、
・種々の溶剤、油脂類との混和性に優れていること、
・食料油として消化、吸収が良い油脂である
の特徴を有している。
【００１４】
一方流動パラフィンは、揮発性も高く好ましい性能を有するが、それ自身単独では粘度が低く、塗膜強度や滑り性（加工性）も低くて滑り性が悪く、成形性が不十分であった。
この流動パラフィンに上記の中鎖脂肪酸グリセライドを混合してみたところ、意外なことに、粘度および揮発性は流動パラフィンに近く、滑り性が中鎖脂肪酸と同等となり、成形性も大きく改善され両者の弱点をそれぞれ補ってさらに好ましい潤滑剤となることが見出された。また流動パラフィンの均等物としてはヘキサン酸エチル、ヘプタン酸エチル、オクタン酸エチルが挙げられる。
【００１５】
中鎖脂肪酸グリセライド或いは中鎖脂肪酸グリセライドと流動パラフィンとの混合物らなる潤滑剤は、通常アルミニウム箔プレス成形用潤滑剤に使用されている粘度低下助剤など各種添加剤を通常の場合と同様に配合使用できる。
このようなアルミニウム箔プレス成形用潤滑剤は、アルミニウム箔等が金属面であれば０．１〜０．５ｇ／ｍ2、好ましくは約０．２〜４ｇ／ｍ2塗布してプレス成形を行う。耐熱性、耐食性の樹脂コーティング面においては０．１〜０．４ｇ／ｍ2、またポリエチレンなどの樹脂フィルム面においては０．１〜０．５ｇ／ｍ2程度塗布してプレス成形を行う。
【００１６】
このようにして得られたアルミニウム箔プレス成形用潤滑剤は、混合した結果の潤滑剤として、摩擦係数μ＝０．１６以下、耐圧力＝２．５ｋｇ／ｃｍ2以上の滑り性を有し、４０℃における粘度が２０ｃｓｔ以下であることが好ましい。摩擦係数がこれより高いとき、あるいは耐圧力が低いときは、プレス成形において材料が破断しやすく、破断伸度が低いため目的とする製品形状に成形が困難となる。また粘度がこれより高いときはワークがべとつき、外観上不快感を与えたり、異物が付着しやすくなるため衛生上製品価値を損なったり、また食品メーカーが包材外面に製品ラベルを貼る場合にラベルがはがれやすくなるので、折角の中鎖脂肪酸トリグリセライドを含む潤滑剤としての利点を損なうことになる。
【００１７】
以下実施例により本発明をより具体的に説明する。
［測定方法］
（１）バウデン試験
Ａ１０５０Ｐのアルミニウム試片に試験すべき成形用潤滑剤を塗布し、室温において荷重０．５ｋｇｆ、滑り速度３．８８ｍｍ／ｓｅｃの条件で、ＳＵＪ−２．３／１６インチの鋼球を試片に押しつけながら往復滑り摩擦係数を測定した。同時に素材摩擦面の写真および工具摩擦面の写真を撮り、成形後の成形品表面を観察した。
（２）耐圧力試験（塗膜強度）
ＪＩＳ Ｋ２５１９に準拠し、曽田式耐圧力試験器を用い、ＳＵＪ−２．３／１６インチの鋼球を用い、固定した３鋼球に対し、試験すべき成形用潤滑剤を浸漬した鋼球を押しつけて、荷重を０．５ｋｇｆ／ｍｉｎの割合で増しながら回転数２００ｒｐｍで一方向に連続して回転させ、固定した３鋼球が動くときの荷重を測定した。
【００１８】
（３）熱特性試験（油膜の揮発性）
試料重量１０ｍｇ、昇温速度５℃／ｍｉｎ、雰囲気ガス：窒素１００ｍｌ／ｍｉｎで通気しながら示差熱重量分析を行い減量曲線を作成してその５０重量％が揮発する温度を測定した。
（４）その他の測定
４０℃における粘度、並びにアルミニウム合金Ａ３００４箔を用いてプレス成形を行い、成形性および成形後の外観のテストを行った。
【００１９】
（参考例１）
厚さ７０μｍのアルミニウム合金箔Ａ３００４材の両面に、プレス成形用潤滑剤として中鎖脂肪酸（炭素数８および１０の飽和脂肪酸の混合）トリグリセライドの０．２ｇ／ｍ2をロールコーターで塗布した。このアルミニウム箔を約８００ｃｍ 2 （非円形）に打ち抜き、プレス成形によって内容積約３００ｍｌの容器を１１０個製造した。その場合の成形性および成形後の外観のテストを行った。これらの結果は表１に示す。
【００２０】
（実施例１〜２、比較例１〜２）
成形用潤滑剤として、参考例１の中鎖脂肪酸トリグリセライドに代え、参考例１の中鎖脂肪酸トリグリセライドと流動パラフィン（重量比で５０：５０）（実施例１）、同中鎖脂肪酸トリグリセライドと流動パラフィン（重量比で２０：８０）（実施例２）、シリコーンオイル（比較例１）および流動パラフィン（比較例２）を用いた他は参考例１と同様に測定を行った。これらの結果を表１に示す。
【００２１】
【表１】
【発明の効果】
本発明は、アルミニウム箔等のプレス成形に使用する潤滑剤、特にアルミニウム箔などの食品包装材へのプレス成形に使用する潤滑剤として、炭素数６ないし１２の飽和脂肪酸トリグリセライドを含有する液状組成物並びに該飽和脂肪酸トリグリセライドに流動パラフィンを配合したアルミニウム箔プレス成形用潤滑剤を開発した。
該潤滑剤はアルミニウム箔プレス成形用潤滑剤に適した適度の粘性を有し、塗膜強度および加工性が高く、該潤滑剤を使用したプレス成形品はその表面状態に優れており、生産性高い食品包装用容器の生産に寄与するものである。[0001]
BACKGROUND OF THE INVENTION
Lubricants used for press molding of aluminum or aluminum alloy foils, those coated with a resin, or composite foils in which these are laminated with a plastic film (hereinafter collectively referred to as “aluminum foils”), particularly aluminum The present invention relates to a lubricant used for press molding of a food packaging material such as a foil, a method for molding a food packaging material using the lubricant, and a food packaging container.
[0002]
[Prior art]
Sliding properties between materials such as aluminum foil and molds when pressing materials containing metal foil such as aluminum foil into various shapes, especially when forming food containers such as baking dishes, cake dishes, pots for udon Usually, a lubricant is applied for the purpose of improving the fracture of the material and improving the moldability. Among such molded articles, the lubricants used as food packaging materials should be those approved as edible or food additives. Therefore, liquid paraffin, silicone, higher fatty acid triglyceride (food oil) has been mainly used.
In particular, food fats and oils have been used as lubricants for molding food packaging materials. As fats and oils for food, liquid vegetable oils such as soybean oil, cottonseed oil, rapeseed oil, olive oil, and solid oils such as coconut oil, beef tallow and pork oil are used for various purposes, but they are solid or unsaturated bonds in the molecule. There were drawbacks such as oxidative polymerization and deterioration.
[0003]
As an aluminum foil press molding lubricant, an appropriate viscosity, formability (sliding property), and volatility are required.
When there is no viscosity as a lubricant, the coating strength of the lubricant also decreases, resulting in poor formability, and when the viscosity is high, it is sticky. There are problems such as easy attachment of dust. If the slipperiness is low, the workpiece is likely to break during machining, which lowers the machining limit. A lubricant having a low latent heat of vaporization and high volatility is desired. This requires a lubricant having the highest volatility as much as possible in order to reduce excessive heating when the lubricant is removed from the product after pressing.
[0004]
For example, liquid paraffin has low viscosity and poor slipperiness, so that moldability is insufficient.
Silicone, on the other hand, is preferable because it has good slipperiness, but has a high viscosity and is sticky, it is difficult to continuously supply workpieces, etc., and it is difficult to remove from the product, which is insufficient as a lubricant.
Higher fatty acid triglycerides are high in viscosity, and saturated higher fatty acid-based ones are solid at room temperature, while unsaturated fatty acid-based ones are liquid but easily oxidatively deteriorated and thus lack stability.
Therefore, among the lubricants that have been proposed or used so far, there is no lubricant for aluminum foil press molding that has been approved as a food or food additive and that can satisfy all the above-mentioned required performances. It was.
[0005]
[Problems to be solved by the invention]
The present invention has an appropriate viscosity suitable for an aluminum foil press molding lubricant among those approved as food or food, has high coating strength and moldability, and is excellent in the surface condition of a molded product. The purpose is to develop press molding lubricants, aluminum foil press molding using the same, and food packaging containers.
[0006]
[Means for Solving the Problems]
The present invention
[1] A lubricant for aluminum foil press molding, which is a liquid composition containing a saturated fatty acid triglyceride having 6 to 12 carbon atoms (hereinafter simply referred to as “medium chain fatty acid triglyceride”),
[2] Lubricant for aluminum foil press molding in which liquid paraffin is blended with medium chain fatty acid triglyceride,
[3] Lubricant for aluminum foil press molding according to the above [2], wherein 90 to 40 parts by weight of liquid paraffin is blended with 10 to 60 parts by weight of medium chain fatty acid triglyceride,
[4] The aluminum according to any one of [1] to [3], wherein the friction coefficient μ is 0.16 or less, the pressure resistance is 2.5 kg / cm 2 or more, the viscosity at 40 ° C. is 30 cst or less, and the freezing point is 5 ° C. or less. Foil press molding lubricant,
[0007]
[5] An aluminum foil press molding method, wherein the lubricant according to any one of the above [1] to [4] containing a medium chain fatty acid triglyceride is applied to an aluminum foil to perform press molding,
[6] A food packaging material, wherein the lubricant according to any one of [1] to [4] is applied to an aluminum foil in an amount of 0.1 to 0.5 g / m 2 and press-molded. And [7] a food packaging container formed by press molding by applying the lubricant according to any one of [1] to [4] to an aluminum foil. Achieved the purpose.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The molded product to be subjected to press molding using the lubricant of the present invention can be any target as long as it is a molded product made of aluminum foil or the like and manufactured by press molding. In particular, since the lubricants of the present invention are all approved as food or food additives, they can be used in food packaging materials such as gratin dishes, cake dishes, pots for pan-baked udon, and other food containers made of aluminum foil. Can be used.
[0009]
In the present invention, aluminum in an aluminum foil or the like means 1000 series pure aluminum series and aluminum alloys, and preferably a pure aluminum series and 3000 series and 5000 series aluminum alloys (particularly 3004) No. aluminum alloy is preferable), but in the case of coating or film laminated aluminum foil, 1000 series or 5000 series aluminum alloy foil is used.
These aluminum foils and the like may be aluminum foils, aluminum alloy foils, or composite aluminum foils laminated thereon with a heat-resistant resin coat and / or a plastic film such as polyethylene, polypropylene, or polyester. These are all desirably used as O materials as in the prior art.
The thickness of the foil varies depending on the size of the molded product such as a container. Generally speaking, the surface of the aluminum foil is about 30 to 120 μm when the aluminum foil is a single piece, and about 30 to 150 μm when the resin coating foil is used. A heat-resistant and corrosion-resistant 0.5 to 10 μm resin such as an epoxy resin can be coated on the other surface, and a heat sealing resin can be coated on the other surface 3 to 15 μm. As the resin for heat sealing, a coating of vinyl chloride / acid modified olefin or the like, or a film of polyethylene, ethylene-vinyl acetate copolymer or the like can be used.
[0010]
In consideration of use in molding food packaging containers in some cases, all of those used as press lubricants according to the present invention are approved as food additives in the food or food hygiene law. As an aluminum foil press molding lubricant, it has moderate viscosity, formability (sliding property), low latent heat of vaporization and high volatility.
That is, all the lubricants of the present invention contain medium-chain fatty acid triglycerides. Here, the medium chain fatty acid means a saturated fatty acid having 6 to 12 carbon atoms, that is, caproic acid, capric acid, caprylic acid, lauric acid. Unsaturated fatty acid triglycerides are not preferred because they are oxidized in the air even at room temperature, and they are difficult to polymerize and discolor or smell.
[0012]
Of the medium chain fatty acids, the triglyceride of lauric acid is solid at room temperature by itself, so it is not preferred to be used alone, and can be used when mixed with other medium chain fatty acid triglycerides. Particularly preferred are caprylic acid triglyceride and capric acid triglyceride.
The lubricant of the present invention is mainly composed of this medium chain fatty acid triglyceride or contains at least 10% by weight, preferably 20% by weight or more of liquid paraffin and medium chain fatty acid triglyceride. In either case, even if it contains a small amount of higher fatty acid triglyceride, it can be used if it is liquid, but it is desirable to avoid it if possible because it increases the viscosity.
The medium-chain fatty acid triglyceride has a viscosity slightly higher than that of liquid paraffin and is slightly inferior in volatility, but has been found to have a very balanced performance as a lubricant and has reached the present invention.
[0013]
The medium chain fatty acid glyceride is
-The freezing point is -5 ° C or less and it is liquid at room temperature and is suitable as a coating agent (excluding lauric acid triglyceride)
・ Because it is composed only of saturated fatty acids without containing unsaturated bonds, it has excellent storage stability without oxidation and polymerization at room temperature.
・ It is almost tasteless and odorless,
・ Excellent miscibility with various solvents and oils,
・ It has the characteristic of being a fat and oil that is easily digested and absorbed as food oil
[0014]
On the other hand, liquid paraffin has high volatility and favorable performance, but itself has low viscosity, low coating strength and slipperiness (workability), poor slipperiness, and insufficient moldability.
When the above medium-chain fatty acid glyceride was mixed with this liquid paraffin, surprisingly, the viscosity and volatility were close to that of liquid paraffin, the slipperiness was equivalent to that of the medium-chain fatty acid, and the moldability was greatly improved. It has been found that each of the weaknesses can be compensated to make a more preferable lubricant. Further, liquid paraffin equivalents include ethyl hexanoate, ethyl heptanoate, and ethyl octoate.
[0015]
Lubricants consisting of medium-chain fatty acid glycerides or a mixture of medium-chain fatty acid glycerides and liquid paraffin are blended with various additives such as viscosity reducing aids that are usually used in aluminum foil press molding lubricants as usual. Can be used.
Such aluminum foil for press molding lubricant performs press forming aluminum foil or the like if the metal surface 0.1 to 0.5 g / m 2, preferably about 0.2~4g / m 2 applied to . Heat resistance, in the resin coating surface of the corrosion-resistant performing press molding by applying about 0.1 to 0.5 g / m 2 in the resin film surface, such as 0.1 to 0.4 g / m 2, also polyethylene.
[0016]
The aluminum foil press-molding lubricant thus obtained has a sliding coefficient of friction coefficient μ = 0.16 or less, withstand pressure = 2.5 kg / cm 2 or more as a mixed lubricant. The viscosity at 40 ° C. is preferably 20 cst or less. When the coefficient of friction is higher than this, or when the pressure resistance is low, the material is easily broken in press molding, and the elongation at break is low, so that it becomes difficult to form the desired product shape. Also, if the viscosity is higher than this, the work will be sticky and uncomfortable in appearance, or foreign substances will easily adhere to it, sacrificing the product value in terms of hygiene. Since it becomes easy to peel off, the advantage as a lubricant containing a medium-chain fatty acid triglyceride at an angle is impaired.
[0017]
Hereinafter, the present invention will be described more specifically with reference to examples.
[Measuring method]
(1) A lubricant for molding to be tested is applied to an aluminum specimen of Bowden test A1050P, and a steel of SUJ-2.3 / 16 inch under conditions of a load of 0.5 kgf and a sliding speed of 3.88 mm / sec at room temperature. The reciprocating sliding friction coefficient was measured while pressing the ball against the specimen. At the same time, a photograph of the material friction surface and a tool friction surface were taken, and the surface of the molded product after molding was observed.
(2) Pressure resistance test (coating film strength)
In accordance with JIS K2519, using a Hamada-type pressure tester, using SUJ-2.3 / 16-inch steel balls, the steel balls immersed in the molding lubricant to be tested were fixed to the three steel balls fixed. It was pressed and continuously rotated in one direction at a rotational speed of 200 rpm while increasing the load at a rate of 0.5 kgf / min, and the load when the three fixed steel balls moved was measured.
[0018]
(3) Thermal characteristic test (volatility of oil film)
A differential thermogravimetric analysis was performed while venting at a sample weight of 10 mg, a heating rate of 5 ° C./min, and an atmospheric gas: nitrogen of 100 ml / min to prepare a weight loss curve, and the temperature at which 50% by weight volatilized was measured.
(4) Other measurements Press molding was performed using the viscosity at 40 ° C. and the aluminum alloy A3004 foil, and the moldability and appearance after molding were tested.
[0019]
( Reference Example 1)
0.2 g / m 2 of medium chain fatty acid (mixture of saturated fatty acids having 8 and 10 carbon atoms) triglyceride as a press molding lubricant was applied to both surfaces of a 70 μm thick aluminum alloy foil A3004 with a roll coater. This aluminum foil was punched into about 800 cm 2 (non-circular), and 110 containers having an internal volume of about 300 ml were manufactured by press molding. In this case, the moldability and the appearance after molding were tested. These results are shown in Table 1.
[0020]
(Examples 1-2, Comparative Examples 1-2)
Instead of the medium chain fatty acid triglyceride of Reference Example 1 as the molding lubricant, the medium chain fatty acid triglyceride of Reference Example 1 and liquid paraffin (50:50 by weight) (Example 1 ), the medium chain fatty acid triglyceride and liquid paraffin Measurement was performed in the same manner as in Reference Example 1 except that (weight ratio 20:80) (Example 2 ), silicone oil (Comparative Example 1) and liquid paraffin (Comparative Example 2) were used. These results are shown in Table 1.
[0021]
[Table 1]
【Effect of the invention】
The present invention relates to a liquid composition containing a saturated fatty acid triglyceride having 6 to 12 carbon atoms as a lubricant used for press molding of aluminum foil or the like, particularly as a lubricant used for press molding of food packaging materials such as aluminum foil. In addition, an aluminum foil press molding lubricant in which liquid paraffin was blended with the saturated fatty acid triglyceride was developed.
The lubricant has a suitable viscosity suitable for aluminum foil press molding lubricant, has high coating strength and processability, and the press-molded product using the lubricant has excellent surface condition and productivity. It contributes to the production of high food packaging containers.
Claims (5)
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