TW202126553A - 用於裝載含有油脂食品的成形容器及包裝體 - Google Patents
用於裝載含有油脂食品的成形容器及包裝體 Download PDFInfo
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- TW202126553A TW202126553A TW109132620A TW109132620A TW202126553A TW 202126553 A TW202126553 A TW 202126553A TW 109132620 A TW109132620 A TW 109132620A TW 109132620 A TW109132620 A TW 109132620A TW 202126553 A TW202126553 A TW 202126553A
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Abstract
[課題]本發明提供一種成形容器,即使長期保存咖哩或燉煮物等大量含有油脂的加工食品,亦不易發生著色或氣味附著。
[解決手段]本發明係使用對於將由均聚丙烯膜所構成的熱熔接性樹脂層10a、由金屬箔所構成的障壁層10c、由合成樹脂膜所構成的保護樹脂層10d依序積層而成的金屬積層包材10以使前述熱熔接性樹脂層10a為內面的方式進行成形而成的容器。
Description
本發明係關於適合保存含有油脂食品的成形容器,及使用此成形容器而成的包裝體。本說明書中若未另外記載,則鋁包含純鋁及鋁合金。
過去即使用罐或瓶來長期保存加工食品。然而,瓶重且易破裂,而罐則有會因開封後的切口而受傷的疑慮等,在運送性及操作性上具有問題。因此,以輕且可撓的積層包材所形成之成形容器被廣泛地使用。
作為積層包材,已知將金屬箔的雙面以合成樹脂膜積層而成的金屬積層包材(所謂的高障壁性薄膜)。又,金屬積層包材之中,將合成樹脂膜貼合於鋁箔的雙面而成的鋁積層包材,其對於光、水分及氧等的阻斷效果高。因此,鋁積層包材,作為各種成形容器(所謂的高障壁性成形容器)的材料,尤其被應用於食品用途。
作為高障壁性成形容器,例如專利文獻1中揭示了一種對於將聚對苯二甲酸乙二酯膜、鋁箔、改質聚丙烯膜及聚丙烯膜進行乾式積層而成的鋁積層包材,去成形為讓聚丙烯膜為最內面之容器。
高障壁性成形容器,以往即被用於裝載果凍、布丁、及斷奶食品等大量包含水分的固態或半固態的食品。另一方面,如咖哩、燉煮物(stew)及義大利麵醬這種大量包含油脂的食品(以下亦稱為含有油脂食品),作為所謂的殺菌食品(Retort food),一般係以袋狀容器包裝而流通。
另外,近年來殺菌食品的需求提高。其背景係雙薪家庭、獨居者的增加,並出現宅經濟的需求等,消費者相關的生活型態具有很大的變化。然而,放入袋狀容器的殺菌食品通常在調理後必須移至盤子或碗等餐具,而需要另外清洗餐具,尤其是獨居者經常感到厭煩。又,最近世界上頻繁發生地震、颱風及洪水等自然災害,在受災地區或避難地區未必能取得餐具。此點,高障壁性成形容器,不僅可作為調理器具,亦可作為餐具直接使用,因此作為方便提供殺菌食品的手段,目前需求確實正在上升。
[先前技術文獻]
[專利文獻]
[專利文獻1]日本專利第2866916號
[發明所欲解決之課題]
然而,若將咖哩或燉煮物等含有油脂食品長期裝載於高障壁性成形容器中,溶入在油脂的著色成分及氣味成分會浸透至成為成形容器最內面的層,而可能發生嚴重的著色或氣味附著。尤其是杯狀成形容器或托盤狀成形容器,在彎曲部分的最外層大幅伸長的同時,最內層強力收縮,而在此收縮部會發生嚴重著色。
[解決課題之手段]
本發明之課題係提供一種使用了金屬積層包材的高障壁性成形容器,即使其中長期裝載含有油脂食品,尤其在加工部位,亦不易發生前述著色及氣味附著的問題。
本案發明人想到以具有均質且緻密之結晶結構的合成樹脂膜來構成成形容器的最內面,藉此作為內容物的含有油脂食品所包含的著色成分及氣味成分就不易轉移至其最內面的內部。而後發現,藉由選擇均聚丙烯膜作為合成樹脂膜可得到能夠解決前述課題的成形容器及包裝體。亦即本發明係關於以下的成形容器及包裝體。
1)一種成形容器,其係用於裝載含有油脂食品且由金屬積層包材所構成的成形容器,其特徵為具有:開口;及凸緣部,環狀地形成於開口周緣;前述金屬積層包材具有由均聚丙烯膜所構成的熱熔接性樹脂層、由金屬箔所構成的障壁層、及由合成樹脂膜所構成的保護樹脂層;前述熱熔接性樹脂層形成容器的最內面,並且前述保護樹脂層形成容器的最外面。
2)如1)之成形容器,其中成為前述熱熔接性樹脂層的均聚丙烯膜的熔點在160℃以上,且結晶熔解能在65J/g以上。
3)如1)或2)之成形容器,其中成為前述熱熔接性樹脂層的均聚丙烯膜的拉伸降伏應力在25MPa以上。
4)如1)至3)中任一項之成形容器,其中在前述熱熔接性樹脂層與前述障壁層之間存在由聚烯烴膜所構成的強化層。
5)如4)之成形容器,其中成為前述強化層的聚烯烴膜為至少2層的積層膜,其至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層。
6)如1)至5)中任一項之成形容器,其中前述障壁層的單面或雙面上形成有由化學處理而來的底塗層。
7)如1)至6)中任一項之成形容器,其中成為前述障壁層的金屬箔為鋁箔。
8) 如1)至7)中任一項之成形容器,其中成為前述保護樹脂層的合成樹脂膜為至少2層的積層膜,其至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層。
9)如1)至8)中任一項之成形容器,其中前述凸緣部的頂面刻劃有開封用切痕。
10)一種包裝體,其係由如1)至9)中任一項之成形容器、含有油脂食品、及最內面由熱熔接性樹脂所形成之蓋所構成的經過熱密封之包裝體,其中,前述蓋的熱熔接性樹脂層與成為前述成形容器之凸緣部頂面的熱熔接性樹脂層之間形成有熱熔接部。
[發明之效果]
1)的成形容器中,係將既定金屬積層包材進行成形而成的容器,因此對於水分、氣體及光等的阻斷效果良好。因此適合長期保存各種食品,特別是富含香味的咖哩、燉煮物或義大利麵醬等的含有油脂食品。又,此成形容器中,成為其最內面的熱熔接性樹脂層係以具有均質且緻密之結晶結構的均聚丙烯膜所形成,由前述含有油脂食品而來的油脂不易浸透至該膜。因此,即使將前述含有油脂食品長期裝載於此成形容器中,其內面整體亦不易附著來自前述油脂的顏色及氣味。尤其是在該成形容器的彎曲加工部位可明顯地確認此情況。如此,1)的成形容器中,其耐著色性及耐氣味附著性良好。
2)的成形容器中,成為其最內面的均聚丙烯膜具有既定值以上的熔點與結晶熔解能,且結晶結構更均質且緻密,因此耐著色性及耐氣味附著性更加良好。
3)的成形容器中,成為其最內面的均聚丙烯膜具有既定值以上的拉伸降伏應力,並呈現更高的強度,因此耐著色性及耐氣味附著性良好,而且耐久性及耐衝擊性等機械性能(以下有時僅稱為機械性能)亦優良。
4)的成形容器中,成為其最內面的熱熔接性樹脂層與障壁層之間存在由聚烯烴膜所構成的強化層,因此耐著色性及耐氣味附著性良好,而且機械性能更加良好。又,因為存在此強化層,因此亦不會在障壁層的單面或雙面中確認到分層。
5)的成形容器中,成為前述強化層的聚烯烴膜係以2層以上的積層膜所構成,且該積層膜係以聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層為要件,因此耐著色性及耐氣味附著性良好,而且機械性能亦良好。又,耐熱性與耐水性亦提升,因此使用此成形容器而成的包裝體,例如即使在熱水中進行加熱,在熱熔接部亦無分層或剝離等缺陷。
6)的成形容器中,在障壁層的單面或雙面上形成有由化學處理而來的底塗層,藉由接著劑將既定的熱熔接性樹脂層或強化層接合於障壁層的頂面,並相同地以接合劑將既定的保護樹脂層接合於障壁層的底面,此情況中,呈現了良好的層間密合性,因此耐著色性及耐氣味附著性良好,而且機械性能亦非常良好。又,耐熱性與耐水性亦提升,因此使用此成形容器而成的包裝體,例如即使在熱水中加熱,在熱熔接部亦無分層或剝離等缺陷。又,前述底塗層,其本身亦具有作為障壁層的功能,因此將含有油脂食品存放於此成形容器而成的包裝體,適合更長期的保存。
7)的成形容器中,成為障壁層的金屬箔為鋁箔,因此輕量且低成本。又,因為鋁箔延展性良好,故此成形容器,即使係以深衝(deep drawing)成形或拉伸成形(stretch forming)等伴隨大幅度變形的成形手段所製造者,鋁箔中亦不會有裂縫或針孔。
8)的成形容器中,成為最外面的合成樹脂膜係以2層以上的積層膜所構成,且此積層膜係以聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層作為要件,因此耐著色性及耐氣味附著性良好,而且機械性能亦良好。又,使用了此成形容器而成的包裝體,例如即使在熱水中加熱,在熱熔接部亦無分層或剝離等缺陷。
9)的成形容器中,在開口周緣刻劃有開封用切痕,因此以此成形容器作為要件的包裝體,易開封性良好。
10)的包裝體,即使在長期保存咖哩、燉煮物或義大利麵醬等含有油脂食品後將其取出,成為本體的成形容器其最內面亦不易殘留顏色,在彎曲加工部位尤其顯著。又,亦無氣味殘留。又,因應本體的成形容器的種類,耐衝擊性及耐久性等機械性能、以及耐熱性及耐水性、以及易開封性的一部分或全部更加良好。
以下,參照圖1至3說明本發明的實施型態。然而此等圖式為例示,並未限定本發明的範圍。
圖1係成為本發明之成形容器(1)的金屬積層包材(10)之一態樣的剖面圖。圖1(a)的金屬積層包材(10),係將熱熔接性樹脂層(10a)、障壁層(10c)及保護樹脂層(10d)依序積層而成。圖1(b)的金屬積層包材(10),係將熱熔接性樹脂層(10a)、強化層(10b)、障壁層(10c)及保護樹脂層(10d)依序積層而成。其中,強化層(10b)為任意並可省略。
圖2係本發明之成形容器(1)的一態樣的立體圖。此成形容器(1)係由金屬積層包材(10)所構成,其係由上方的開口(11)、開口(11)的周緣(12)、在周緣(12)形成環狀的凸緣部(13)、使周緣(12)在交界處與凸緣部(13)連續而往下方延伸的圓筒狀側壁(14)、被側壁(14)圍繞的底壁(15)所構成。凸緣部(13)的頂面刻劃有環狀的開封用切痕(16)。
圖3係本發明之包裝體(2)的一態樣的剖面圖。包裝體(2)係經過熱密封的密封體,其以本發明之成形容器(1)、作為內容物的含有油脂食品(3)、作為密封手段的蓋(4)為要件。
熱熔接性樹脂層(10a)係形成成形容器(1)之最內面的層並與蓋(4)的底面熱熔接的層,其係以均聚丙烯膜(A)所構成。均聚丙烯膜(A)係由丙烯的均聚物所構成的膜,具有相對均質且緻密的結晶結構,因此耐油性優良。又,均聚丙烯膜(A)絞合(hinge)特性亦良好,因此即使在金屬積層包材(10)的成形時使其變形,內部亦不易產生孔洞。根據以上例示的理由,即使將含有油脂食品(3)裝載於成形容器(1),來自含有油脂食品(3)的著色成分及氣味成分變得難以浸透至熱熔接性樹脂層(10a)的內部,結果成形容器(1) 發揮良好的耐著色性及耐氣味附著性。
作為均聚丙烯膜(A),可使用各種習知者,可列舉例如:在氯化鈦(III)-二乙基氯化鋁等齊格勒系觸媒的存在下使丙烯進行配位陰離子聚合而得到同排( isotactic )均聚丙烯並將其膜化而成者。又,亦可列舉:將以BASE法、Anoco法或UCC法等所得之均聚丙烯來膜化而成者。膜化手段並未特別限定,可採用各種習知的(共)擠製成型法(吹製、T字模等)、延伸法或積層法等,亦可將此等方法組合。又,以延伸法進行的情況,均聚丙烯膜(A)可為延伸型或無延伸型任一者。若選擇無延伸型者,則成形容器(1)的耐著色性及耐氣味附著性變得更加良好。
均聚丙烯膜(A),若結晶結構更均質且緻密,則成形容器(1)的耐著色性及耐氣味附著性會提升。從此觀點而言,作為均聚丙烯膜(A),較佳為熔點在160℃以上且結晶熔解能在65J/g以上者。此處「熔點」係指根據JIS K7121-1987以示差掃描熱分析法(以下稱為DSC)所測得的熔解峰值溫度(Tmp)。又,「結晶熔解能」係指根據JIS K7122-1987以DSC所測得的峰值熔解熱(結晶熔解能,ΔH)。又,Tmp的峰值與ΔH的峰值為複數的情況,分別採用最大值。此熔點與結晶熔解能,依序較佳為160~165℃及65~80J/g,此情況中,成形容器(1)的耐著色性及耐氣味附著性變得更加良好。
又,若均聚丙烯膜(A)的拉伸降伏應力(Tensile Yield Stress;以下有時簡稱為TYS)在25MPa以上,則成形容器(1)的耐著色性及耐氣味附著性良好,而且耐衝擊性及耐久性等機械性能亦變得優良。此處「拉伸降伏應力」係根據JIS K7127的測量值,其係MD方向上的TYS與TD方向上的TYS的加權平均值。此拉伸降伏應力較佳為25~45MPa,更佳為31~39MPa,此情況中,成形容器(1)的機械性能變得更良好。此情況中,MD方向上的TYS通常為34~40MPa,TD方向上的TYS通常為28~38MPa。
作為均聚丙烯膜(A),只要是未大幅損及成形容器(1)的耐著色性及耐氣味附著性的範圍,則亦可使用使丙烯與微量的乙烯或1-丁烯等其他α烯烴共聚合而成的聚丙烯所構成的膜。作為α烯烴,可列舉例如:乙烯及/或1-丁烯。α烯烴在均聚丙烯膜(A)中的含量小於10莫耳%。
均聚丙烯膜(A)的厚度,亦即熱熔接性樹脂層(10a)的厚度並未特別限定,但若考慮金屬積層包材(10)的成形性、以及成形容器(1)的耐著色性、耐氣味附著性及耐熱性等,通常為20~400μm,較佳為40~350μm。
熱熔接性樹脂層(10a)與強化層(10b)或障壁層(10c)之間,亦可任意地設置接著劑層(101)(圖中未顯示)。作為成為接著劑層(101)的接著劑,可使用各種習知者,可列舉例如:聚胺基甲酸酯樹脂系接著劑、丙烯酸樹脂系接著劑、環氧樹脂系接著劑、聚烯烴樹脂系接著劑及彈性體系接著劑,可併用二種以上。其中,較佳為聚胺基甲酸酯樹脂系接著劑,特佳為雙液硬化型聚醚-胺基甲酸酯樹脂系接著劑及/或雙液硬化型聚酯-胺基甲酸酯樹脂系接著劑。藉由使接著劑包含後述填充物,可賦予接著劑層(101)例如設計性。特別是藉由包含二氧化鈦等白色顏料,更容易檢測混入成形容器(1)內面的異物。若考慮此等效果與接著劑層(101)之接著強度的平衡,則填充物的含量通常為10~60重量%。接著劑層(101)的厚度並未特別限定,通常為1~5μm。
強化層(10b)為任意,可由各種習知的聚烯烴膜(B)構成。藉由使強化層(10b)存在於熱熔接性樹脂層(10a)與金屬箔層(10c)之間,可提升成形容器(1)及包裝體(2)的機械性能。
作為構成聚烯烴膜(B)的聚烯烴,可使用各種習知者,可列舉例如:聚乙烯及聚丙烯。作為聚乙烯,可列舉例如:高密度聚乙烯、中密度聚乙烯及線狀低密度聚乙烯。作為聚丙烯,可列舉例如:均聚丙烯、聚(乙烯-丙烯)無規共聚物及聚乙烯-聚丙烯嵌段共聚物。由均聚丙烯所構成的膜亦可與均聚丙烯膜(A)相同。聚乙烯及聚丙烯皆可由馬來酸酐或乙酸乙烯酯等不飽和羧酸進行改質。聚烯烴的膜化手段並未特別限定,可列舉各種習知的(共)擠製成型法(吹製、T字模等)、延伸法或積層法等。以延伸法進行的情況,聚烯烴膜(B)可為延伸型及無延伸型任一者。
聚烯烴膜(B),可包含各種習知填充物及/或彈性體。作為填充物,可列舉:白黏土、二氧化矽、滑石、二氧化鈦及碳黑等,亦可組合二種以上。作為彈性體,可列舉:苯乙烯系彈性體及/或烯烴系彈性體等,亦可組合二種以上。
若聚烯烴膜(B)以至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層的至少2層的積層膜來構成,則金屬積層包材(10)的成形性及成型容器(1)的耐衝擊性變得特別良好。積層膜的層數,具體可為2~5層。作為積層膜的具體例,可列舉以任意順序將聚(乙烯-丙烯)無規共聚物層及聚乙烯-聚丙烯嵌段共聚物層組合而成的2層或3層的聚烯烴膜。
聚烯烴膜(B)的厚度,亦即強化層(10b)的厚度並未特別限定,從金屬積層包材(10)的成形性、以及成形容器(1)及包裝體(2)的耐久性及耐衝擊性等觀點來看,通常為20~300μm,較佳為30~200μm。
強化層(10b)與障壁層(10c)之間亦可任意地設置接著劑層(102)(圖中未顯示)。作為成為接著劑層(102)的接著劑,可使用與成為接著劑層(101)之接著劑相同者,特佳為雙液硬化型聚醚-胺基甲酸酯樹脂系接著劑及/或雙液硬化型聚酯-胺基甲酸酯樹脂系接著劑。又,接著劑層(102)中亦可以前述的量包含接著劑層(101)可含有的前述填充物。接著劑層(102)的厚度並未特別限定,通常為1~5μm左右。
障壁層(10c),係保護含有油脂食品(3)不受氣體、水蒸氣及光等影響的層,可由各種習知的金屬箔(C)構成。作為金屬箔(C),可列舉例如:鋁箔、鐵箔、不銹鋼箔、銅箔及鎳箔。此等之中,從遮光性、障壁功能、成形性、成本等的觀點來看,鋁箔較為理想。又,鋁箔因為延展性良好,即使對於金屬箔(C)由鋁箔所構成的金屬積層包材(10)施加深衝成形或拉伸成形等伴隨大幅變形的成形手段,障壁層(10c)亦不易產生裂縫或針孔等缺陷。作為鋁箔,可列舉軟質(O材)或硬質(H18材)的純鋁箔或鋁合金箔,特佳為含有0.7~1.7%之鐵的Al-Fe系合金箔。例如,JIS H4160規定之A1000系或A8000系的軟質材(O材),深衝成形等的冷軋成形中成形性優良,因而較佳。作為軟質材(O材),可列舉例如:A8021H-O材、A8079H-O材及A1N30-O材等。金屬箔(C)的厚度,亦即障壁層(10c)的厚度無特別限制,但從障壁層(10c)之前述缺陷、以及成形容器(1)及包裝體(2)的耐久性、耐衝擊性等觀點來看,通常為50~200μm,較佳為50~150μm。
亦可在障壁層(10c)的雙面中至少在單面上形成由化學處理而來的底塗層。例如,應用選自下述群組的水-醇溶液作為化學處理液,藉此在進行了脫脂處理的金屬箔(C)的表面上形成該底塗層。
(i)包含選自由磷酸、鉻酸、氟化物之金屬鹽及氟化物之非金屬鹽所構成之群組的至少一種化合物的水-醇溶液
(ii)包含選自由磷酸、丙烯酸系樹脂、幾丁聚醣衍生物樹脂及酚系樹脂所構成之群組的至少一種樹脂與選自由鉻酸及鉻(III)鹽所構成之群組的至少一種化合物的水-醇溶液
(iii) 包含選自由磷酸、丙烯酸系樹脂、幾丁聚醣衍生物樹脂及酚系樹脂所構成之群組的至少一種樹脂、選自由鉻酸及鉻(III)鹽所構成之群組的至少一種化合物、以及選自由氟化物的金屬鹽及氟化物的非金屬鹽所構成之群組的至少一種化合物的水-醇溶液
化學處理液的使用量並未特別限定,障壁層(10c)的每一單面之鉻附著量通常為0.1~50mg/m2
,較佳為2~20mg/m2
的範圍即可。
障壁層(10c)與保護樹脂層(10d)之間,亦可任意設置接著劑層(103)(圖中未顯示)。作為成為接著劑層(103)的接著劑,可使用與成為接著劑層(101)之接著劑相同者,特佳為雙液硬化型聚醚-胺基甲酸酯樹脂系接著劑及/或雙液硬化型聚酯-胺基甲酸酯樹脂系接著劑。又,接著劑層(103)中亦可以前述的量含有接著劑層(101)中可含有的前述填充物。接著劑層(103)的厚度並未特別限定,通常為1~5μm左右。
保護樹脂層(10d)係形成成形容器(1)之最外面的層並且確保成形容器(1)及包裝體(2)的強度且用以保護包裝體(2)中裝載之含有油脂食品(3)不受外部影響的層,可由各種習知的合成樹脂膜(D)構成。
作為成為合成樹脂膜(D)的合成樹脂,可列舉例如:聚烯烴、聚酯及聚醯胺、以及其他合成樹脂。作為聚烯烴,可列舉聚乙烯及聚丙烯。作為聚乙烯,例如,可例示:高密度聚乙烯、中密度聚乙烯及線狀低密度聚乙烯。作為聚丙烯,可列舉例如:均聚丙烯、聚(乙烯-丙烯)無規共聚物及聚乙烯-聚丙烯嵌段共聚物。由均聚丙烯所構成的膜,亦可與均聚丙烯膜(A)相同。聚乙烯及聚丙烯皆可由馬來酸酐或乙酸乙烯酯等酸進行改質。又,作為聚酯,可列舉例如:聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯及聚萘二甲酸丁二酯等。又,作為聚醯胺,可列舉:6-尼龍等。又,作為其他合成樹脂,可列舉例如:聚苯乙烯、聚氯乙烯及聚碳酸酯等。合成樹脂膜(D)的膜化手段並未特別限定,可列舉:各種習知的(共)擠製成型法(吹製、T字模等)、延伸法或積層法等。以延伸法進行的情況,合成樹脂膜(D)可為延伸型及無延伸型任一者。合成樹脂膜(D),可包含前述填充物及/或前述彈性體。
若合成樹脂膜(D)以至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層的至少2層的積層膜構成,則金屬積層包材(10)的成形性及成型容器(1)的耐候性等變得良好。積層膜的層數具體為2~5層即可。作為積層膜的具體例,可列舉:聚(乙烯-丙烯)無規共聚物層及聚乙烯-聚丙烯嵌段共聚物層以任意順序組合而成的2層或3層的聚烯烴膜。
合成樹脂膜(D)的表面,亦可形成由環氧樹脂、氯化聚烯烴樹脂、硝化纖維、丙烯酸樹脂、氯化乙烯-乙酸乙烯酯共聚物等熱固***聯性樹脂所構成之保護塗劑所構成的層。
合成樹脂膜(D)的厚度,亦即保護樹脂層(10d)的厚度無特別限制,但若考慮成形容器(1)以及包裝體(2)的耐久性、耐衝擊性及耐候性等,則通常為15~50μm,較佳為15~40μm。
金屬積層包材(10)可以各種習知的方法製作。作為方法,可例示乾式積層法、擠製積層法及熱積層法等。乾式積層法的情況可使用前述接著劑。
以下舉出金屬積層包材(10)的較佳態樣。
第一態樣:熱熔接性樹脂層(10a)由無延伸均聚丙烯膜(厚度20~400μm,較佳為40~350μm)所構成,障壁層(10c)由以前述化學處理液在至少單面上形成有底塗層的鋁箔(特別是JIS H4160的A8079H-O材或A8021H-O材)(厚度50~200μm,較佳為50~150μm)所構成,保護樹脂層(10d)由聚(乙烯-丙烯)無規共聚物層及聚乙烯-聚丙烯嵌段共聚物層以任意順序組合而成的2層或3層的聚烯烴膜(總厚度15~50μm,較佳為15~40μm)所構成。
第二態樣:在第一態樣中,於熱熔接性樹脂層(10a)與保護樹脂層(10d)之間,存在聚(乙烯-丙烯)無規共聚物層及聚乙烯-聚丙烯嵌段共聚物層以任意順序組合而成之2層或3層的膜(總厚度20~300μm,較佳為30~200μm)以作為強化層(10b)。
本發明的成形容器(1),係以各種習知的成形手段將金屬積層包材(10)加工而成者。作為成形手段,可列舉拉伸成形及深衝成形等的壓製成形。深衝成形的情況,首先,將裁切為既定尺寸的金屬積層包材(10)從保護樹脂層(10d)側設置於固定母模具(die)的頂面。接著,在金屬積層包材(10)的熱熔接性樹脂層(10a)之一側,使與成形容器(1)的裝載部相同形狀的可動公模具下降,進行深衝。接著,使可動公模具上升,從固定母模具中取出成形容器(1)。成形容器(1)的凸緣部(13)亦可因應需求進行修整(trimming)而去除不要的部分。如此得到預期形狀的成形容器(1)。
成形容器(1)的形狀並未特別限定,只要因應用途及設計適當設定即可。例如開口(11)可為圓形、橢圓形及多角形等。凸緣部(13)亦可為圓環狀、橢圓環狀及多角環狀等。側壁(14)可為圓柱狀、多角柱狀及錐狀,亦可在中間位置設有階差或實施浮凸(Emboss)加工。底壁(15)與開口(11)相同,亦可為圓形、橢圓形及多角形等。成形容器(1)整體的形狀,不限於如圖2的杯狀,亦可為例如托盤狀。成形容器(1)的尺寸並未特別限定,如圖2之杯狀的成形容器(1)的情況,例如凸緣部(13)的寬度為5~10mm左右,開口(11)的直徑(R)與容器深度(D)的比(D/H)為2左右。
開封用切痕(16)的形成方法並未特別限定,例如,將加熱至200℃左右的環狀切痕形成刀刃(省略圖示)按壓在凸緣部(13)的頂面,藉此使該刀尖侵入熱熔接性樹脂層(10a)的內部,之後將其向上抬起,藉此留下與該刀尖相同之剖面形狀的開封用切痕(16)。作為切痕形成刀刃,可列舉例如:日本特開2017-30087號公報或日本實公平7-20004號公報記載者。開封用切痕(16)的位置亦未特別限定,在凸緣部(13)的寬度為5~10mm的情況,例如通常只要在距離開口(11)之周緣(12)2~4mm的位置即可。
本發明的包裝體(2),係在將含有油脂食品(3)裝載於成形容器(1)後,藉由使蓋(4)的底面熱熔接於凸緣部(13)頂面而得。
包裝體(2)的開封,係藉由在蓋(4)底面的熱熔接樹脂層(40d)與成形容器(1)的熱熔接樹脂層(10a)之間所產生的界面剝離來進行。
圖3(a)係本發明的包裝體(2)的部分剖面圖,藉由前述熱熔接,在蓋(4)底面與成形容器(1)的凸緣部(13)的頂面之間形成環狀的熱熔接部(51)。另一方面,熱熔接部(51)的外周側(開口(11)的相反側)形成有環狀的未熱熔接部(52),可利用其作為開封用起始處。未熱熔接部(52)的寬度並未特別限定,但凸緣部(13)的寬度為5~10mm的情況,通常為1~3mm。又,此情況中,熱熔接部(51)的寬度通常為7~9mm。
圖3(b)的包裝體(2)中,在從成形容器(1)的開口(11)稍微有距離的位置刻劃有開封用切痕(16)。開封用切痕(16)的位置並未特別限定,在凸緣部(13)的寬度為5~10mm的情況,例如通常只要在距離開口(11)之周緣(12)2~4mm的位置即可。又,此情況中,熱熔接部(51)的寬度通常為6~8mm。開封用切痕(16)的橫向剖面通常為略V字形,但亦可為例如略U字形。開封用切痕(16)為略V字形的情況,由兩斜邊所形成的角度並未特別限定,通常為5°~25°。開封用切痕(16)的尖端位置並未特別限定,只要達到熱熔接性樹脂層(10a)或強化層(10b)即可。尖端到達障壁層(10c)附近的情況(省略圖示),即使藉由熱熔接性樹脂層(10a)或強化層(10b)的內聚破壞(cohesive failure)來進行蓋(4)的剝離,亦必定停止於開封用切痕(16)的位置,因此開封變得更容易。
作為含有油脂食品(3),可列舉含動植物油的半固態或固態加工食品。具體而言,可列舉:咖哩露、義大利麵醬、燉煮物、多蜜醬(demi-glace sauce)、魚類加工食品(鮪魚、鯖魚、秋刀魚及沙丁魚等油漬物或燉煮物等)、花生醬及肉類加工品(鹹牛肉(Corned beef)、午餐肉(Spam)等)等香味食品。
蓋(4)係成形容器(1)中所裝載之含有油脂食品(3)的密封手段,其係以積層包材(40)所構成。
圖3(a)及(b)中,積層包材(40)係將既定的保護樹脂層(40a)、金屬箔層(40b)、強化層(40c)、及熱熔接性樹脂層(40d)依序積層而成者。其中,金屬箔層(40b)與強化層(40c)皆為任意而可省略。
保護樹脂層(40a),係形成蓋(4)之最外面的層,其係由各種習知的合成樹脂膜所構成。作為合成樹脂膜,可使用前述舉出作為合成樹脂膜(D)者,較佳係選自延伸聚丙烯膜、延伸聚對苯二甲酸乙二酯膜及延伸聚醯胺膜的膜。又,保護樹脂層(40a),亦可為將相同或不同的合成樹脂膜以任意順序組合一種或兩種而成的多層。又,保護樹脂層(40a)亦可由前述保護塗劑所構成。保護樹脂層(40a)的厚度未特別限制,但從包裝體(2)的耐久性及耐衝擊性、耐候性等的觀點來看,通常為1~30μm。
任意的金屬箔層(40b)發揮作為障壁層的功能,其保護成形容器(1)中所裝載之含有油脂食品(3)不受氣體、水蒸氣及光等影響。作為金屬箔,可使用與金屬箔(C)相同者,較佳為鋁箔。作為鋁箔,可列舉O材或H18材的純鋁箔或鋁合金箔。金屬箔層(40b)的雙面上,亦可藉由前述化學處理液在至少單面上形成底塗層。金屬箔層(40b)的厚度無特別限制,通常為5~40μm。
任意的強化層(40c),係由各種習知合成樹脂膜所構成,藉由設置於金屬箔層(40b)與熱熔接性樹脂層(40d)之間而可提升蓋(4)的強度。作為合成樹脂膜,除了可列舉聚烯烴膜(B)以外,亦可例示前述聚酯膜及前述聚醯胺膜。強化層(40c)亦可為合成樹脂膜的2層或3層以上的複合膜。強化層(40c)的厚度未特別限制,通常為5~30μm。
熱熔接性樹脂層(40d),係熱封於構成成形容器(1)之凸緣部(13)頂面的熱熔接性樹脂層(10a)的層,其係以各種習知的熱塑性樹脂膜構成。具體而言,可列舉例如:舉出作為聚烯烴膜(B)的聚乙烯膜及聚丙烯膜,以及聚乙烯醇膜、離子聚合物樹脂膜及丙烯酸系共聚合樹脂膜等。熱塑性樹脂膜可包含前述填充物及/或彈性體。熱熔接性樹脂層(40c),亦可為將相同或不同的熱塑性樹脂膜以任意的順序組合一種或二種以上的多層。熱熔接性樹脂層(40d)的厚度未特別是限制,通常為10~100μm。
積層包材(40),例如可以乾式積層法、擠製積層法及熱積層法等製作。乾式積層法的情況,可使用前述接著劑作為層間接著劑。
蓋(4)係將積層包材(40)加工成預期形狀者。蓋(4)的形狀並未特別限定,例如,只要與成形容器(1)的凸緣部(13)為相同形狀或相似形狀即可。蓋(4)上亦可任意設置開封用舌片,其尺寸及形狀並未特別限定。作為形狀,可列舉例如:半圓形、三角形或四角形。開封用舌片,亦可為構成蓋(4)之積層包材(40)的一部分。亦可將另外製作的舌片安裝於蓋(4)的外周緣的一部分。
包裝體(2)的製造法並未特別限定,可利用各種習知的方法。以圖2的成形容器(1)為例,在此成形容器(1)中放入既定量的含有油脂食品(3)後,從熱熔接性樹脂層(40d)側將既定形狀的蓋(4)載置於凸緣部(13)的頂面,將加熱至既定溫度的環狀熱封器以既定壓力、既定時間按壓於既定位置,將成為蓋(4)底面的熱熔接性樹脂層(40d)與成為成形容器(1)之凸緣部(13)頂面的熱熔接性樹脂層(10a)進行熱熔接,藉此進行熱密封,而得到包裝體(2)。蓋(4)的端緣亦可因應需求修整。圖3(a)及(b)的包裝體(2),共通地在蓋(4)的底面與凸緣部(13)的頂面之間,產生有在凸緣部(13)整個周方向上的環狀熱熔接部(51)。其中,圖3(a)的包裝體(2)的情況,在熱熔接部(51)的外側形成有既定寬度的未熱熔接部(52),可使用其作為開封用起始處。又,圖3(b)的包裝體(2)的情況,在熱熔接部(51)的內側形成既定形狀的開封用切痕(16),可使用其作為開封用起始處。
包裝體(2),因為兼具保存容器、調理器具及餐具的功能,因此具有在將含有油脂食品(3)加熱並開封後可直接食用的便利性。
[實施例]
以下,通過實施例及比較例進一步說明本發明,但此等並不限定本發明的技術範圍。
本實施例中所使用之簡稱其意思如下。
Tmp(℃):熔點(JIS K7121-1987)
ΔH(J/g):結晶熔解能(JIS K7122-1987)
TYS(MPa):拉伸降伏應力 (JIS K7127)
HPP1~3:均聚丙烯
rPP:聚(乙烯-丙烯)無規共聚物
bPP:聚(乙烯-丙烯)嵌段共聚物
LLDPE:線狀低密度聚乙烯
PET:聚對苯二甲酸乙二酯
PU接著劑:雙液硬化型聚酯-聚胺基甲酸酯系接著劑
熔點(Tmp ℃)及結晶熔解能(ΔH J/g)為下述條件中的測量值。
・測量裝置:島津製作所製股份有限公司示差掃描熱量分析儀「DSC-60A」
・樣本量:5mg
・測量溫度:23℃~210℃
・升溫速度:10℃/分鐘
拉伸降伏應力(TYS)係使用A&D股份有限公司製 Tensilon RTG-1210的測量值。
表1中顯示HPP1、HPP2、HPP3、rPP、bPP及LLDPE的熔點、結晶熔解能以及拉伸降伏應力。
[表1]
1.鋁積層包材的製作
製造例1
Tmp | ΔH | TYS(MPa) | |||
(℃) | (J/g) | MD | TD | 平均 | |
HPP1 | 163 | 75 | 33.5 | 31.8 | 32.7 |
HPP2 | 166 | 79 | 39.4 | 37.6 | 38.5 |
HPP3 | 165 | 76 | 36.8 | 28.8 | 32.8 |
rPP | 135 | 18 | 26.4 | 25.3 | 25.9 |
bPP | 160 | 55 | 6.90 | 6.20 | 6.60 |
LLDPE | 125 | 120 | 14.3 | 11.8 | 13.1 |
以磷酸、丙烯酸系樹脂、氯化鉻(III)、水及醇所構成的化學處理液對於120μm厚的鋁箔(A8079H-O材)的雙面進行處理,製作形成有底塗層的處理鋁箔。又,每一單面的鉻附著量為10mg/m2
。接著,在處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合由HPP1所構成的膜(厚度300μm,以T字模法製造)。接著,在處理鋁箔的另一面上以使塗布PU接著劑讓乾燥膜厚成為3μm,並貼合厚度4.5μm的rPP層、厚度21μm的bPP層、厚度4.5μm的rPP層所構成的總厚度30μm的無延伸三層共擠製聚烯烴膜,藉此製作積層體。接著,將此積層體於40℃進行時效8天,藉此作為鋁積層包材A。
製造例2~3
在製造例1中使用由HPP2所構成的膜(300μm厚,以T字模法製造)或由HPP3所構成的膜(厚度300μm,以T字模法製造)代替由HPP1所構成的膜,除此之外,相同地製作鋁積層包材B及C。
製造例4
在製造例1的處理鋁箔的單面上,塗布PU接著劑讓乾燥膜厚成為3μm,並貼合由rPP所構成的厚度30μm的膜。接著,在此rPP膜的表面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合HPP1膜。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例1的3層共擠製聚烯烴膜,藉此製作積層體。接著,以與製造例1相同的條件使此積層體進行時效,藉此作為鋁積層包材D。
製造例5~6
在製造例4中使用HPP2膜或HPP3膜代替HPP1膜,除此之外,相同地製作鋁積層包材E及F。
製造例7
在製造例1的處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合由厚度150μm的bPP層與厚度25μm的rPP層所構成的總厚度175μm的2層共擠製聚烯烴膜以作為強化層。接著,在此2層共擠製聚烯烴膜上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合HPP1膜。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例1的3層共擠製聚烯烴膜,藉此製作積層體。接著,以與製造例1相同的條件使此積層體進行時效,藉此作為鋁積層包材G。
製造例8~9
在製造例7中使用HPP2膜或HPP3膜代替HPP1膜,除此之外,相同地製作鋁積層包材H及I。
比較製造例1
在製造例1的處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例4的rPP膜(30μm厚)以作為強化層。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例1的3層共擠製聚烯烴膜,藉此製作積層體。接著,以與製造例1相同的條件使積層體進行時效,藉此作為鋁積層包材J。
比較製造例2
在製造例1的處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例7的2層共擠製聚烯烴膜以作為強化層。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例1的3層共擠製聚烯烴膜,藉此製作積層體。接著,以與製造例1相同的條件使此積層體進行時效,藉此作為鋁積層包材K。
比較製造例3
在製造例1的處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合由LLDPE所構成的厚度50μm的膜以作為強化層。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合製造例1的3層共擠製聚烯烴膜,藉此製作積層體。接著,以與製造例1相同的條件使此積層體進行時效,藉此作為鋁積層包材L。
2.成形容器的製作
實施例1
將鋁積層包材A設置於市售的壓製模具機,在拉伸(draw forming)成形後進行修整,藉此製作圖2所示之杯狀成形容器A。成形容器A,凸緣部外徑為86mm,凸緣部寬度為10mm,開口徑為66mm,高度為30mm,底徑為56mm。
實施例2~6
在實施例1中,使用鋁積層包材B~F代替鋁積層包材A,除此之外,相同地製作與成形容器A相同尺寸的成形容器B~F。
實施例7
在實施例1中,使用鋁積層包材G代替鋁積層包材A,除此之外,相同地製作與成形容器A相同尺寸的成形容器。接著,在此成形容器的凸緣部的頂面,將加熱至200℃的環狀切痕形成刀刃以120kgf的加壓力按壓2秒,藉此在距離開口周緣2mm的位置,刻劃剖面為略V字形的環狀開封用切痕,以製作成形容器G。切口的深度為110μm,其尖端如圖3(b)所示,認為其到達成為強化層的bPP膜層。
實施例8~9
在實施例7中,使用鋁積層包材H或I代替鋁積層包材G,除此之外,相同地製作成形容器H及I。各別的尺寸與成形容器A相同,又,形成於各凸緣部頂面的開封用切痕的形狀及尺寸,亦與成形容器A的切痕相同。
比較例1~3
在實施例1中,使用鋁積層包材J、K或L代替鋁積層包材A,除此之外,相同地製作成形容器J、K及L。
表2顯示成形容器A~L的層構成。
[表2]
3.蓋的製作
製造例10
實施例 | 比較例 | |||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | 2 | 3 | |
(1)成形容器 | A | B | C | D | E | F | G | H | I | J | K | L |
(A)均聚丙烯薄膜 | HPP | HPP | HPP | HPP | HPP | HPP | HPP | HPP | HPP | |||
1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | ||||
(B)聚丙烯薄膜 其他聚烯烴薄膜 | -- | rPP | (bPP/rPP) | rPP | (bPP/rPP) | LLDPE | ||||||
(C)金屬箔 | 處理鋁箔(雙面化學處理) | |||||||||||
(D)合成樹脂薄膜 | (rPP/bPP/rPP) |
以製造例1的塗布液對於12μm厚的鋁箔(A8021-H18材)的雙面進行化學處理,製作形成有底塗層的處理鋁箔。此外,每一單面的鉻附著量為10mg/m2
。接著,在處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,貼合厚度25μm的雙軸延伸PET膜。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合厚度50μm的LLDPE膜作為熱熔接性樹脂,以製作積層體。接著,使積層體於40℃進行時效8天,藉此製作積層包材。接著,將積層包材裁切成120mm×120mm的正方形,以製作蓋A。
製造例11
在製造例10的處理鋁箔的單面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合厚度25μm的雙軸延伸PET膜以作為保護樹脂層。接著,在處理鋁箔的另一面上塗布PU接著劑讓乾燥膜厚成為3μm,並貼合厚度12μm的雙軸延伸PET膜以作為強化層。接著,在強化層的雙軸延伸PET膜上塗布PU接著劑讓乾燥膜厚成為3μm,貼合厚度50μm的LLDPE膜作為熱熔接性樹脂層,以製作積層體。接著,以與製造例10相同條件,使積層體進行時效,藉此製作積層包材。然後將積層包材裁切為120mm×120mm的正方形,以製作蓋B。
4.包裝體的製作
實施例10
準備2個成形容器A。一個成形容器A中放入從市售的殺菌咖哩露(好侍食品股份有限公司製 Pro-quality beef curry(註冊商標)中辣)去除食材而剩下的醬汁20g,並將蓋A載置於凸緣部。接著,將加熱至190℃的環狀密封器(外徑84mmφ,內徑72mmφ,寬度6mm)以使其開口中心與成形容器A之開口中心在同一垂直線上的方式以0.2MPa按壓於該凸緣部2秒,藉此製作放入有咖哩露的包裝體A。另一個成形容器A中放入水20ml,以相同的方法及條件將蓋A在該凸緣部上進行熱封,以製作放入有水的包裝體A。各包裝體A中,在凸緣部頂面內側的整個周方向上的寬度6mm之帶狀區域皆構成熱熔接部,外側寬度1mm的未熱熔接部則作為開封起始處使用。又,凸緣部頂面的內側形成有寬度3mm的未熱熔接部。
實施例11~15
針對成形容器B~F,與實施例10相同地,製作放入有咖哩露的包裝體B~F及放入有水的包裝體B~F。各包裝體具有與包裝體A相同尺寸及數量的熱熔接部以及未熱熔接部。
實施例16
準備2個成形容器G。一個成形容器G中,放入從前述殺菌咖哩露去除食材而剩下的醬汁20g,將蓋B載置於凸緣部。接著,將加熱至190℃的環狀密封器(外徑86mmφ,內徑72mmφ,寬度7mm)以其開口中心與成形容器G之開口中心在同一垂直線上的方式,以0.2MPa按壓該凸緣部2秒,藉此製作放入有咖哩露的包裝體G。另一個成形容器G中放入水20ml,以相同的方法及條件將蓋B在其凸緣部上進行熱封,藉此製作放入有水的包裝體G。各包裝體G,在凸緣部頂面之外側的整個周方向上的寬度7mm之帶狀區域皆構成熱熔接部,並且無外側的未熱熔接部。又,凸緣部頂面的內側形成有寬度3mm的未熱熔接部,此未熱熔接部上形成有開封用切痕。
實施例17、18
針對成形容器H及I,亦與實施例16相同地,製作放入有咖哩露的包裝體H及I以及放入有水的包裝體H及I。各包裝體具有與包裝體G相同尺寸及數量的熱熔接部以及未熱熔接部。
比較例4~6
針對成形容器J~L,與實施例10相同地,使用蓋A製作放入有咖哩露的包裝體J~L及放入有水的包裝體J~L。各包裝體具有與包裝體A相同尺寸及數量的熱熔接部以及未熱熔接部。
5.包裝體的評估
5-1.易開封性、耐著色性及耐氣味附著性
將放入有咖哩露的包裝體A於常溫放置四週後,在傾斜45°的狀態下,設置於市售的拉伸試驗機,測量將蓋A往上方拉伸時的強度,結果約20N。接著,從開封後的成形容器A中倒出並丟棄咖哩露,洗淨內部之後,以布擦拭,以下述標準對於成形容器A的側壁及底壁以及轉角部的著色與成形容器A裝載部內的氣味殘留進行官能評估。針對放入有咖哩露的包裝體B~L亦進行相同的官能評估。結果顯示於表3。
○:皆未確認到容器內面的著色、氣味殘留。
△:容器內面之中僅在轉角部確認到些微的著色。未確認到氣味殘留。
×:容器內面之中在底壁與轉角部皆確認到嚴重著色。亦確認到氣味殘留。
[表3]
5-2.熱處理時的熱熔接部的缺陷的有無
實施例 | 比較例 | ||||||||||||
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 4 | 5 | 6 | ||
(2)包裝體 | A | B | C | D | E | F | G | H | I | J | K | L | |
(4)蓋 | A | A | A | A | A | A | B | B | B | A | A | A | |
(1)成形容器 | A | B | C | D | E | F | G | H | I | J | K | L | |
開封用起始處 | 切口 | 無 | 有 | 無 | |||||||||
未熱熔接部 | 有 | 無 | 有 | ||||||||||
評估 | 開封強度 | 20N | 20N | 20N | 20N | 20N | 20N | 15N | 15N | 15N | 15N | 20N | 20N |
耐著色性 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | × | △ | × | |
耐氣味附著性 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | × | △ | × |
將放入有水的包裝體A在殺菌釜中進行加熱處理(125℃,20分鐘)後,從凸緣部的側面目視觀察熱熔接部,結果未確認到分層及剝離等缺陷。針對放入有水的包裝體B~L亦進行相同的評估,同樣並未確認到缺陷。
根據表3的結果,實施例的包裝體A~I中,作為本體的成形容器之最內面皆由均聚丙烯膜所形成,因此耐著色性及耐氣味附著性良好,開封強度亦為沒有問題的等級。另一方面,比較例的包裝體J~L中,作為本體的成形容器之最內面皆非均聚丙烯而是由聚烯烴所形成,因此開封強度雖無問題,但耐著色性及耐氣味附著性不佳。
[產業上的可利用性]
本發明的成形容器適合長期保存咖哩、燉煮物或義大利麵醬等含有油脂食品。
1:成形容器
2:包裝體
3:含有油脂食品
4:蓋
10:金屬積層包材
10a:熱熔接性樹脂層
10b:強化層
10c:障壁層
10d:保護樹脂層
11:開口
12:周緣
13:凸緣部
14:側壁
15:底壁
16:開封用切痕
40:積層包材
40a:保護樹脂層
40b:金屬箔層
40c:強化層
40d:熱熔接性樹脂層
51:熱熔接部
52:未熱熔接部
A:均聚丙烯膜
B:聚烯烴膜
C:金屬箔
D:合成樹脂膜
圖1係構成本發明之成形容器的金屬積層包材之一態樣的剖面圖,(a)係顯示基本構成,(b)係顯示變形例。
圖2係本發明的成形容器之一態樣的立體圖。
圖3係本發明的包裝體之一態樣的部分剖面圖,(a)係顯示凸緣部頂面未刻劃開封用切痕的態樣,(b)係顯示凸緣部頂面刻劃有開封用切痕的態樣。
1:成形容器
2:包裝體
3:含有油脂食品
4:蓋
10:金屬積層包材
10a:熱熔接性樹脂層
10b:強化層
10c:障壁層
10d:保護樹脂層
12:周緣
13:凸緣部
16:開封用切痕
40:積層包材
40a:保護樹脂層
40b:金屬箔層
40c:強化層
40d:熱熔接性樹脂層
51:熱熔接部
52:未熱熔接部
Claims (10)
- 一種成形容器,其係用於裝載含有油脂食品且由金屬積層(laminate)包材所構成的成形容器,其特徵為具有: 開口;及 凸緣部,環狀地形成於開口周緣; 前述金屬積層包材具有由均聚丙烯膜所構成的熱熔接性樹脂層、由金屬箔所構成的障壁層、及由合成樹脂膜所構成的保護樹脂層; 前述熱熔接性樹脂層形成容器的最內面,並且前述保護樹脂層形成容器的最外面。
- 如請求項1之成形容器,其中成為前述熱熔接性樹脂層的均聚丙烯膜的熔點在160℃以上,且結晶熔解能在65J/g以上。
- 如請求項1之成形容器,其中成為前述熱熔接性樹脂層的均聚丙烯膜的拉伸降伏應力(tensile yield stress)在25MPa以上。
- 如請求項1之成形容器,其中在前述熱熔接性樹脂層與前述障壁層之間存在由聚烯烴膜所構成的強化層。
- 如請求項4之成形容器,其中成為前述強化層的聚烯烴膜為至少2層的積層膜,其至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層。
- 如請求項1之成形容器,其中前述障壁層的單面或雙面上形成有由化學處理而來的底塗層。
- 如請求項1之成形容器,其中成為前述障壁層的金屬箔為鋁箔。
- 如請求項1之成形容器,其中成為前述保護樹脂層的合成樹脂膜為至少2層的積層膜,其至少包含聚(丙烯-乙烯)無規共聚物層及/或聚丙烯-聚乙烯嵌段共聚物層。
- 如請求項1之成形容器,其中前述凸緣部的頂面刻劃有開封用切痕。
- 一種包裝體,其係由如請求項1至9中任一項之成形容器、含有油脂食品、及最內面由熱熔接性樹脂所形成之蓋所構成的經過熱密封之包裝體,其中, 前述蓋的熱熔接性樹脂層與成為前述成形容器之凸緣部頂面的熱熔接性樹脂層之間形成有熱熔接部。
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WO2022270157A1 (ja) * | 2021-06-22 | 2022-12-29 | 昭和電工パッケージング株式会社 | 成形容器用積層体、成形容器および包装体 |
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US5836919A (en) * | 1996-05-23 | 1998-11-17 | Solopak Pharmaceuticals, Inc. | Cap assembly |
US6143825A (en) * | 1999-05-14 | 2000-11-07 | Montell Technology Company Bv | Adhesive propylene polymer compositions suitable for coating substrates |
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