TW201609381A - 拋棄式發熱包外袋用多層膜及拋棄式發熱包 - Google Patents
拋棄式發熱包外袋用多層膜及拋棄式發熱包 Download PDFInfo
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- TW201609381A TW201609381A TW104124967A TW104124967A TW201609381A TW 201609381 A TW201609381 A TW 201609381A TW 104124967 A TW104124967 A TW 104124967A TW 104124967 A TW104124967 A TW 104124967A TW 201609381 A TW201609381 A TW 201609381A
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- layer
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- outer bag
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Abstract
本發明提供一種阻止氧氣、水蒸氣等透過之氣體阻隔性優異並且可防止因保存期間中產生之氫氣所引起之膨脹的拋棄式發熱包外袋用多層膜及拋棄式發熱包。
本發明係一種拋棄式發熱包外袋,其係由包含密封劑層10及障壁層20之多層膜所形成者,其中密封劑層10成為外袋之內側表面,障壁層20成為外側表面。密封劑層10包含於熱熔性樹脂基材11之至少一面(圖1中為上側)上蒸鍍金屬或金屬氧化物而成之蒸鍍層12。障壁層20包含於耐熱性樹脂基材21之至少一面(圖1中為下側)上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層22。
Description
本發明係關於一種拋棄式發熱包外袋用多層膜及拋棄式發熱包。
拋棄式發熱包係利用由鐵粉之氧化作用所引起之放熱的發熱包,通常係將於不織布或紙等之透氣性袋內收納放熱性組合物而成之內袋,收納於包含未使用時隔絕與空氣之接觸之非透氣性膜的外袋中,並進行密封包裝而成,上述放熱性組合物含有作為放熱體之鐵粉、作為氧化觸媒之鹽、用以吸入氧之活性碳、使鐵氧化之水、用以保水之保水劑及其他。
拋棄式發熱包外袋必須於阻止空氣尤其是氧氣、水蒸氣等之透過之氣體阻隔性方面優異。於拋棄式發熱包外袋對氧氣及水蒸氣之氣體阻隔性較差之情形時,於長時間之保存中,拋棄式發熱包外袋內部之氣體或水蒸氣向外部散發而成為負壓(真空)狀態,於外袋上產生凹陷,外觀上欠佳。又,如此般成為負壓(真空)狀態者於長時間之保存後作為拋棄式發熱包而使用之情形時,大多情況下其放熱之持續時間變短。作為構成拋棄式發熱包外袋之非透氣性膜,一般使用在密封劑層上設置有阻氣層並於最外層設置有耐熱性樹脂層之多層膜。將該等非透氣性多層膜重疊2片,並將位於內側之密封劑層之周緣部相互熱密封而形成為袋狀,藉此製造拋棄式發熱包外袋。
作為構成此種拋棄式發熱包外袋之非透氣性膜,例如已提出
有:於作為雙軸延伸聚酯系樹脂膜、雙軸延伸聚醯胺系樹脂膜或雙軸延伸聚烯烴系樹脂膜之基材膜之一面上,設置無機氧化物之蒸鍍膜,並於該蒸鍍膜上依序設置底塗劑層、印刷花紋層、及聚乙烯等熱密封性樹脂層而成之多層膜(專利文獻1~2)。於該多層膜中,蒸鍍有無機氧化物之基材膜為阻氣層,熱密封性樹脂層為密封劑層。
且說,已知若將拋棄式發熱包於未使用之狀態下長時間保存,則產生微量之氫氣。拋棄式發熱包外袋因氫氣而膨脹,外觀上欠佳。因此,要求拋棄式發熱包外袋於長時間之保存中不膨脹之程度之氫氣透過性。然而,如上所述,拋棄式發熱包外袋亦要求阻止氧氣、水蒸氣等透過之氣體阻隔性優異。因此,若提高形成拋棄式發熱包外袋之非透氣性膜之上述氣體阻隔性,則氫氣透過性降低,導致長時間之保存中膨脹。因此,作為滿足對氧氣及水蒸氣之氣體阻隔性與氫氣透過性之相悖條件者,提出有如下拋棄式發熱包用外袋,該拋棄式發熱包用外袋係將雙軸延伸聚對苯二甲酸乙二酯膜作為最外層,並利用乾式層壓於其內側接著在雙軸延伸聚丙烯(OPP)上蒸鍍鋁而成之第1金屬蒸鍍膜層,且利用乾式層壓於遠離最外層之內側接著在未延伸聚丙烯(CPP)上蒸鍍鋁而成之第2金屬蒸鍍膜層而成(專利文獻3)。於該多層膜中,第1金屬蒸鍍膜層為障壁層,第2金屬蒸鍍膜層為密封劑層。
然而,專利文獻3中記載之拋棄式發熱包用外袋存在以下問題:難以於外層側之OPP膜上蒸鍍鋁,進而內側層之CPP膜由於拉伸強度及撕裂強度劣於經延伸之OPP膜故容易延伸,於製造步驟中鋁蒸鍍膜出現裂痕而無法確保較高之氣體阻隔性等。因此,提出有如下拋棄式發熱包用外袋,其係將雙軸延伸聚丙烯作為基材膜,並於該基材膜之內側,積層有於聚對苯二甲酸乙二酯之外表面上具有氧化鋁之蒸鍍膜的障壁膜、及聚乙烯等密封劑樹脂層(專利文獻4)。然而,得知專利文獻4記載之拋棄式發熱包用外袋無法透過所產生之氫氣而膨脹。若
膨脹達到極限,則外袋破損,收納於內袋之放熱性組合物氧化而放熱,故導致作為拋棄式發熱包之功能受損。
如上所述,拋棄式發熱包外袋用多層膜雖提出有多種,但一直期望作為商品而可歷經長時間確保最佳之氣體透過性與氣體阻隔性之拋棄式發熱包外袋用多層膜及拋棄式發熱包。
[專利文獻1]日本專利特開2002-086607號公報
[專利文獻2]日本專利特開2002-120860號公報
[專利文獻3]日本專利特開2006-347582號公報
[專利文獻4]日本專利特開2012-065876號公報
因此,本發明之目的在於提供一種阻止氧氣、水蒸氣等透過之氣體阻隔性優異並且可防止因保存中產生之氫氣所引起之膨脹的拋棄式發熱包外袋用多層膜及拋棄式發熱包。
本發明者等人為了解決上述問題而進行了銳意研究,結果發現,包含於基材上蒸鍍金屬或金屬氧化物而成之蒸鍍層、及於基材上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層的多層膜作為拋棄式發熱包外袋而可實現最佳之氧氣及水蒸氣透過性,從而完成了本發明。尤其使於熱熔性樹脂上蒸鍍金屬或金屬氧化物而成之密封劑層、及於耐熱性樹脂上塗佈聚偏二氯乙烯而成之障壁層積層所得的多層膜可防止氧氣及水蒸氣之過量透過,且可實現使氫氣透過之最佳之氣體透過性及水蒸氣透過性。本發明之具體態樣如下。
[1]一種拋棄式發熱包外袋用多層膜,其特徵在於:包含於基材
上蒸鍍金屬或金屬氧化物而成之蒸鍍層、及於基材上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層。
[2]如[1]記載之拋棄式發熱包外袋用多層膜,其特徵在於:上述蒸鍍層為於熱熔性樹脂基材之至少一面上蒸鍍金屬或金屬氧化物而成之密封劑層,上述聚偏二氯乙烯層為於耐熱性樹脂基材之至少一面上塗佈聚偏二氯乙烯而成之障壁層。
[3]如[1]或[2]記載之拋棄式發熱包外袋用多層膜,其特徵在於:上述蒸鍍層係於選自未延伸聚丙烯、雙軸延伸聚丙烯、未延伸聚乙烯、低密度聚乙烯、中密度聚乙烯、高密度聚乙烯及直鏈狀(線狀)低密度聚乙烯中之上述基材或上述熱熔性樹脂基材上蒸鍍金屬或金屬氧化物而成。
[4]如[1]至[3]中任一項記載之拋棄式發熱包外袋用多層膜,其特徵在於:上述蒸鍍層係於選自未延伸聚丙烯、雙軸延伸聚丙烯及直鏈狀(線狀)低密度聚乙烯中之上述基材或上述熱熔性樹脂基材上蒸鍍鋁而成,上述聚偏二氯乙烯層係於選自雙軸延伸聚丙烯、雙軸延伸聚對苯二甲酸乙二酯及雙軸延伸聚醯胺樹脂中之上述基材或上述耐熱性樹脂基材上塗佈聚偏二氯乙烯樹脂而成。
[5]如[1]至[4]中任一項記載之拋棄式發熱包外袋用多層膜,其特徵在於:於上述蒸鍍層與上述聚偏二氯乙烯層之間進而包含接著劑層。
[6]如[1]至[5]中任一項記載之拋棄式發熱包外袋用多層膜,其特徵在於:包含追加之樹脂層。
[7]如[1]至[6]中任一項記載之拋棄式發熱包外袋用多層膜,其特徵在於:於20℃、90%RH下所測得之氧透過度為1.5~5.0cc/(m2‧day‧atm),於40℃、90%RH下所測得之水蒸氣透過度為0.05~1.5g/(m2‧day)。
[8]一種拋棄式發熱包,其係於將如上述[1]至[7]中任一項記載之拋棄式發熱包外袋用多層膜熱熔而形成之外袋中,密封包裝收納有放熱性組合物之內袋而成。
本發明之拋棄式發熱包外袋用多層膜作為阻止氧氣及水蒸氣之透過並且容許氫氣之透過的拋棄式發熱包外袋而具有最佳之氣體阻隔性。
本發明之拋棄式發熱包可防止因保存中產生之氫氣所引起之膨脹以及因氧氣及水蒸氣之透過所引起之放熱性組合物之劣化,即便長時間保存亦可防止作為拋棄式發熱包之功能受損。
10‧‧‧密封劑層
11‧‧‧熱熔性樹脂基材
12‧‧‧蒸鍍層
20‧‧‧障壁層
21‧‧‧耐熱性樹脂基材
22‧‧‧聚偏二氯乙烯層
30‧‧‧接著劑層
40‧‧‧印刷油墨層
50‧‧‧追加之樹脂層
圖1係表示本發明之拋棄式發熱包外袋用多層膜之一態樣之積層構成之說明圖。
圖2係表示本發明之拋棄式發熱包外袋用多層膜之另一態樣之積層構成之說明圖。
圖3係表示本發明之拋棄式發熱包外袋用多層膜之又一態樣之積層構成之說明圖。
以下,針對本發明之拋棄式發熱包外袋用多層膜及拋棄式發熱包,一面參照圖式一面進行說明。
本發明之拋棄式發熱包外袋用多層膜之特徵在於:包含於基材上蒸鍍金屬或金屬氧化物而成之蒸鍍層、及於基材上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層。蒸鍍金屬或金屬氧化物之基材與塗佈聚偏二氯乙烯之基材可相同,亦可不同。關於蒸鍍層與聚偏二氯乙烯層之積層位置,於製成拋棄式發熱包外袋時,聚偏二氯乙烯層及蒸鍍層之任一層成為內側或外側均可,較佳為聚偏二氯乙烯層積層於成為外側
之位置,蒸鍍層積層於成為內側之位置。
圖1~3表示本發明之拋棄式發熱包外袋用多層膜之實施態樣。拋棄式發熱包外袋用多層膜包含密封劑層10及障壁層20。於拋棄式發熱包外袋中,密封劑層10成為外袋之內側表面,障壁層20成為外側表面。
於圖1中,密封劑層10包含於熱熔性樹脂基材11之至少一面(圖1中為上側)上蒸鍍金屬或金屬氧化物而成之蒸鍍層12。障壁層20包含於耐熱性樹脂基材21之至少一面(圖1中為下側)上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層22。於圖1所示之態樣中,於密封劑層10上,積層有接著劑層30及印刷油墨層40。接著劑層30係用於使密封劑層10之蒸鍍層12接著於障壁層20或其他層。印刷油墨層40可為了印刷商品說明等視需要而設置。
圖2所示之態樣除圖1之構成以外,還於接著劑層30與印刷油墨層40之間包含追加之樹脂層50。設置於中間之追加之樹脂層50提高多層膜之強度。又,藉由設置追加之樹脂層50而多層膜整體之厚度增加,藉此可使氣體透過性及水蒸氣透過性進一步降低。
圖3所示之態樣係於密封劑層10上積層下側之接著劑層30,繼而以成為耐熱性樹脂基材21及聚偏二氯乙烯層22之順序之方式積層障壁層20,進而依序介隔上側之接著劑層30及印刷油墨層40,以追加之樹脂層50成為最外層之方式積層而成。
包含圖1~3所示之本發明之拋棄式發熱包外袋用多層膜之拋棄式發熱包外袋於熱熔性樹脂基材11之至少一面上具備蒸鍍金屬或金屬氧化物而成之蒸鍍層12作為密封劑層10,及於耐熱性樹脂基材21之至少一面上具備聚偏二氯乙烯層22作為障壁層20,藉此於某種程度上阻斷氧自外袋外部向外袋內部滲入,又,容許氫自外袋內部向外袋外部透過。藉此,有效地防止收納於拋棄式發熱包內袋中之放熱性組合物
中之鐵粉等金屬之氧化,又,有效地防止因保存中產生之氫氣所引起之外袋之膨脹。進而,藉由具備偏二氯乙烯層22及蒸鍍層12,防止水蒸氣之透過之水蒸氣阻隔性變高。藉此,防止來自外袋外部之水分向外袋內部之滲入,又,防止發揮以下作用之水以水蒸氣之形式自外袋內部向外袋外部釋出:促進於拋棄式發熱包之放熱性組合物中作為構成成分而含有之鐵粉等金屬之氧化的作用。
繼而,對本發明之拋棄式發熱包外袋用多層膜之構成成分及其製造方法進行說明。
密封劑層10包含熱熔性樹脂基材11及蒸鍍層12。作為熱熔性樹脂,例如可使用以下樹脂之一種或兩種以上:以丙烯酸、甲基丙烯酸、順丁烯二酸酐、反丁烯二酸、及其他等不飽和羧酸將低密度聚乙烯、中密度聚乙烯、高密度聚乙烯、直鏈狀(線狀)低密度聚乙烯、聚丙烯、乙烯-乙酸乙烯酯共聚物、離子聚合物樹脂、乙烯-丙烯酸乙酯共聚物、乙烯-丙烯酸共聚物、乙烯-甲基丙烯酸共聚物、乙烯-丙烯共聚物、甲基戊烯聚合物、聚乙烯、聚苯乙烯、聚丙烯等聚烯烴系樹脂改性而成之酸改性聚烯烴系樹脂,及其他等樹脂。可使用一種或更多之上述各種樹脂,使用擠出法、澆鑄成形法、T模法、切割法、膨脹法、其他製膜化法,藉由將單獨或兩種以上之各種樹脂進行多層共擠出製膜化的方法、進而使用兩種以上之樹脂並於進行製膜化之前混合而製膜化的方法等,而製造各種樹脂之薄膜,進而,例如利用拉幅方式、或管式方式等在單軸或雙軸方向上延伸,形成各種樹脂膜。其中,較佳為未延伸聚丙烯、雙軸延伸聚丙烯、未延伸聚乙烯、低密度聚乙烯、中密度聚乙烯、高密度聚乙烯或直鏈狀(線狀)低密度聚乙烯,尤其就熱熔性之觀點而言,更佳為未延伸聚丙烯、雙軸延伸聚丙烯或直鏈狀(線狀)低密度聚乙烯。
又,作為熱熔性樹脂基材11之厚度,較佳為5~300μm,更佳為
10~100μm,最佳為15~50μm。
蒸鍍於熱熔性樹脂基材11上之蒸鍍層係由金屬或金屬氧化物形成。作為蒸鍍於熱熔性樹脂基材11上之金屬,具體可列舉:鋁、金、銀、銅、鎳、鉻、鍺、硒、鈦、錫、鋅等。又,作為蒸鍍於熱熔性樹脂基材11上之金屬氧化物,具體可列舉氧化鋁、氧化矽等。作為蒸鍍於熱熔性樹脂基材11上之金屬或金屬氧化物,就經濟性而言,較佳為鋁、氧化鋁、氧化矽,更佳為就氣體阻隔性、經濟性、穩定性及實用性等而言,較佳為鋁。
蒸鍍層12之厚度較佳為50~5000埃,更佳為100~1000埃,最佳為200~800埃。
密封劑層單獨之氧透過度(20℃、90%RH)較佳為10~200cc/(m2‧day‧atm),更佳為10~150cc/(m2‧day‧atm),最佳為10~100cc/(m2‧day‧atm)。又,密封劑層單獨之水蒸氣透過度(40℃、90%RH)較佳為0.05~5.0g/(m2‧day),更佳為0.05~3.0g/(m2‧day),最佳為0.5~3.0g/(m2‧day)。
作為於熱熔性樹脂基材11上蒸鍍金屬或金屬氧化物之方法,例如可使用真空蒸鍍法、濺鍍法、離子鍍敷法等。
障壁層20包含使聚偏二氯乙烯樹脂塗佈於耐熱性樹脂基材21上而成之聚偏二氯乙烯層22。
作為耐熱性樹脂基材21,例如可使用:聚乙烯系樹脂或聚丙烯系樹脂等聚烯烴系樹脂,環狀聚烯烴系樹脂,聚苯乙烯系樹脂,丙烯腈-苯乙烯共聚物(AS樹脂),丙烯腈-丁二烯-苯乙烯共聚物(ABS樹脂),聚(甲基)丙烯酸系樹脂,聚碳酸酯系樹脂,聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯等聚酯系樹脂,各種尼龍等聚醯胺系樹脂,聚胺基甲酸酯系樹脂,縮醛系樹脂,纖維素系樹脂,其他等各種樹脂之薄膜。其中,較佳為聚酯系樹脂、聚烯烴系樹脂、或聚醯胺系樹脂之
薄膜,尤佳為雙軸延伸聚丙烯、雙軸延伸聚對苯二甲酸乙二酯或雙軸延伸聚醯胺樹脂。可使用一種或更多之上述各種樹脂並使用擠出法、澆鑄成形法、T模法、切割法、膨脹法、其他製膜化法,藉由將單獨或兩種以上之各種樹脂進行多層共擠出製膜化的方法、進而使用兩種以上之樹脂並於進行製膜化之前混合而製膜化的方法等,製造各種樹脂之薄膜,進而,例如利用拉幅方式、或管式方式等在單軸或雙軸方向上延伸,形成各種樹脂膜。
作為耐熱性樹脂基材21之厚度,較佳為3~500μm,更佳為5~300μm,進而較佳為10~100μm,最佳為15~50μm。
塗佈於耐熱性樹脂基材21上之聚偏二氯乙烯樹脂較佳為偏二氯乙烯之均聚物或共聚物。該等聚合物之中,偏二氯乙烯含量處於較佳為50~98莫耳%之範圍、更佳為75~96莫耳%之範圍內之偏二氯乙烯共聚物由於成膜性、氣體阻隔性之平衡優異,故較佳。作為可與偏二氯乙烯共聚之單體之具體例,例如可於以下單體中選擇一種或兩種以上而使用:氯乙烯,丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、丙烯酸2-乙基己酯、丙烯酸2-羥基乙酯等丙烯酸酯,甲基丙烯酸甲酯、甲基丙烯酸縮水甘油酯等甲基丙烯酸酯,丙烯腈、甲基丙烯腈,及丙烯酸、甲基丙烯酸、伊康酸、順丁烯二酸等不飽和羧酸等。其中,就製膜性之方面而言,可較佳地使用氯乙烯、丙烯酸酯。又,聚偏二氯乙烯樹脂亦可適當組合兩種以上而使用。進而,亦可於聚偏二氯乙烯樹脂中適當添加熱穩定劑或光穩定劑、潤滑劑等添加劑而使用。聚偏二氯乙烯樹脂通常係以乳膠或溶液之形式而使用。
作為此種聚偏二氯乙烯層22之形成方法,例如可藉由將視需要溶解或分散於溶劑中而製成塗佈液之聚偏二氯乙烯樹脂塗佈於耐熱性樹脂基材21之表面上之方法等形成。
聚偏二氯乙烯層22之厚度並無特別限定,根據所需之氧氣阻隔
性等適當進行設定即可,較佳為0.5~30μm,更佳為0.8~10μm,最佳為1~2μm。
障壁層單獨之氧透過度(20℃、90%RH)較佳為1.5~20cc/(m2‧day‧atm),更佳為2.0~15cc/(m2‧day‧atm),最佳為2.0~10cc/(m2‧day‧atm)。又,障壁層單獨之水蒸氣透過度(40℃、90%RH)較佳為1.0~20g/(m2‧day),更佳為2.5~15g/(m2‧day)。
具有上述密封劑層10及障壁層20之本發明之拋棄式發熱包外袋用多層膜之氧透過度(20℃、90%RH)較佳為1.5~5.0cc/(m2‧day‧atm),更佳為2.0~4.5cc/(m2‧day‧atm),最佳為2.5~4.0cc/(m2‧day‧atm),水蒸氣透過度(40℃、90%RH)較佳為0.05~1.5g/(m2‧day),更佳為0.05~1.0g/(m2‧day),最佳為0.05~0.75g/(m2‧day)。藉由將具有上述密封劑層10及障壁層20之本發明之拋棄式發熱包外袋用多層膜之氧透過度及水蒸氣透過度設為上述數值範圍,可發揮如下效果:阻止氧氣、水蒸氣等透過之氣體阻隔性優異,並且可防止因保存中產生之氫氣所引起之膨脹。
較佳為於上述密封劑層10及障壁層20之間設置接著劑層30,使密封劑層10與障壁層20接著而進行積層。作為構成接著劑層之接著劑,可無限制地使用通常用於拋棄式發熱包外袋用多層膜之接著劑,例如可使用:醚系接著劑,聚乙酸乙烯酯系接著劑,包含丙烯酸之乙酯、丁酯、2-乙基己酯等之均聚物或該等與甲基丙烯酸甲酯、丙烯腈、苯乙烯等之共聚物等的聚丙烯酸酯系接著劑,氰基丙烯酸酯系接著劑,包含乙烯與乙酸乙烯酯、丙烯酸乙酯、丙烯酸、甲基丙烯酸等單體之共聚物等的乙烯共聚物系接著劑,纖維素系接著劑,聚酯系接著劑,聚醯胺系接著劑,聚醯亞胺系接著劑,包含脲樹脂或三聚氰胺樹脂等之胺基樹脂系接著劑,酚樹脂系接著劑,環氧系接著劑,聚胺基甲酸酯系接著劑,反應型(甲基)丙烯酸系接著劑,包含氯丁二烯橡
膠、腈橡膠、苯乙烯-丁二烯橡膠等之橡膠系接著劑,聚矽氧系接著劑,包含鹼金屬矽酸鹽、低熔點玻璃等之無機系接著劑,其他接著劑。接著劑之組成系可為水性型、溶液型、乳膠型、分散型等之任一組合物形態。又,接著劑之性狀可為薄膜/片狀、粉末狀、固體狀等之任一形態。進而,關於接著機制,可為化學反應型、溶劑揮發型、熱熔融型、熱壓型等之任一形態。接著劑之使用態樣亦可無限制地使用通常使用之態樣,例如,可於密封劑層10或障壁層20之至少一者上藉由輥式塗佈法、凹版輥式塗佈法、接觸塗佈法、其他塗佈法或印刷法等而塗佈接著劑,繼而使溶劑等乾燥而形成接著劑層。作為接著劑之含量,較佳為0.1~10g/m2(乾燥狀態),更佳為0.5~8g/m2(乾燥狀態),最佳為1.5~4g/m2(乾燥狀態)。
本發明之拋棄式發熱包外袋用多層膜可於任意部位設置印刷油墨層40作為構成成分。作為印刷油墨層40,可將通常之一種或兩種以上之油墨媒劑作為主成分,視需要任意添加塑化劑、穩定劑、抗氧化劑、光穩定劑、紫外線吸收劑、硬化劑、交聯劑、潤滑劑、抗靜電劑、填充劑、及其他等添加劑之一種或兩種以上,進而添加染料/顏料等著色劑,利用溶劑、稀釋劑等充分混練而製備油墨組合物,繼而使用該油墨組合物,使用例如凹版印刷、套版印刷、凸版印刷、網版印刷、轉印印刷、軟版印刷、及其他等印刷方式,印刷所需文字、圖形、記號、花紋及其他而形成。
作為油墨媒劑,可無限制地使用通常用於拋棄式發熱包外袋之油墨媒劑,例如可列舉:亞麻仁油、桐油、大豆油、烴油、松香、松香酯、松香改性樹脂、蟲膠、醇酸樹脂、酚系樹脂、順丁烯二酸樹脂、天然樹脂、烴樹脂、聚氯乙烯系樹脂、聚乙酸乙烯酯系樹脂、聚苯乙烯系樹脂、聚乙烯醇縮丁醛樹脂、丙烯酸或甲基丙烯酸系樹脂、聚醯胺系樹脂、聚酯系樹脂、聚胺基甲酸酯系樹脂、環氧系樹脂、脲
樹脂、三聚氰胺樹脂、胺基醇酸系樹脂、硝化纖維素、乙基纖維素、氯化橡膠、環化橡膠、及其他的一種或兩種以上。
作為印刷油墨層40之含量,較佳為0.1~10g/m2(乾燥狀態),更佳為0.5~8g/m2(乾燥狀態),最佳為1~5g/m2(乾燥狀態)。
本發明之拋棄式發熱包外袋用多層膜可進而包含追加之樹脂層50。追加之樹脂層50只要不妨礙本發明之拋棄式發熱包外袋用多層膜之氣體透過性及水蒸氣透過性,則可為包含任意樹脂之層,且可設置於任意位置。例如,可使用用作密封劑層10之基材之熱熔性樹脂或者用作障壁層20之基材之耐熱性樹脂。於為熱熔性樹脂之情形時,可設置於較密封劑層10更靠外側,用作形成外袋時之熱密封部分。於為耐熱性樹脂之情形時,較佳為設置於密封劑層10及障壁層20之間,或與密封劑層10相反之側且較障壁層20更靠外側、即成為拋棄式發熱包外袋之外表面之位置。於設置於密封劑層10與障壁層20之間之情形時,提高多層膜之強度,於設置於成為拋棄式發熱包外袋之外表面之位置之情形時,作為保護膜而發揮作用。追加之樹脂層50之厚度並無特別限定,較佳為3~500μm,更佳為5~300μm,進而較佳為5~100μm,最佳為5~50μm。
本發明之拋棄式發熱包外袋用多層膜可實現較佳為1.5~5.0cc/(m2‧day‧atm)、更佳為2.0~4.5cc/(m2‧day‧atm)、最佳為2.5~4.0cc/(m2‧day‧atm)之氧透過度(20℃、90%RH)及較佳為0.05~1.5g/(m2‧day)、更佳為0.05~1.0g/(m2‧day)、最佳為0.05~0.75g/(m2‧day)之水蒸氣透過度(20℃、90%RH)。藉由將本發明之拋棄式發熱包外袋用多層膜之氧透過度及水蒸氣透過度設為定上述數值範圍,可發揮如下效果:阻止氧氣、水蒸氣等透過之氣體阻隔性優異,並且可防止因保存中產生之氫氣所引起之膨脹。為了穩定地長期保存拋棄式發熱包,必須使氧透過度及水蒸氣透過度兩者均為上述範圍內,若任
意一者成為範圍外,則變得無法獲得所需效果。
繼而,對本發明之拋棄式發熱包外袋用多層膜及拋棄式發熱包外袋之製造方法進行說明。
本發明之拋棄式發熱包外袋用多層膜可於使成為密封劑層10之蒸鍍熱熔性樹脂、成為障壁層20之塗佈有聚偏二氯乙烯樹脂之耐熱性樹脂、成為接著劑層30之接著劑、及視需要之印刷油墨層40及追加之樹脂層50進行積層之狀態下,使用輥等進行壓接而製造。
繼而,可將2片拋棄式發熱包外袋用多層膜以熱熔性樹脂基材11之面相對向之方式重疊,將熱熔性樹脂基材11之周緣部進行熱密封,藉此形成為袋狀,而製造拋棄式發熱包外袋。熱密封之態樣可無限制地使用通常所用之態樣,例如可為側面密封型、兩方密封型、三方密封型、四方密封型、信封式密封型、合掌式密封型(枕形密封型)、帶褶密封型、平底密封型、角底密封型、角撐型、其他熱密封形態。熱密封之方法亦可無限制地使用通常所用之方法,例如可為棒密封、旋轉輥密封、傳送帶密封、脈衝密封、高頻密封、超音波密封等。
本發明之拋棄式發熱包係於由上述拋棄式發熱包外袋用多層膜所形成之拋棄式發熱包外袋中,密封包裝收納有放熱性組合物之內袋而成。
放熱性組合物只要為通常用於拋棄式發熱包之放熱性組合物即可,並無特別限定。例如可為含有鐵粉等金屬粉、食鹽等反應助劑、活性碳、保水劑、水及其他之放熱性組合物。具體而言,例如可包含:還原鐵粉、鑄鐵粉等鐵粉、鋁粉等金屬粉100重量份,氯化鈉等反應助劑3~10重量份,活性碳及保濕劑20~40重量份,水30~90重量份,及其他等。再者,可於上述放熱性組合物中,例如添加氫氧化鈉、氫氧化鉀、碳酸氫鈉、磷酸三鈉等鹼金屬氫氧化物及弱鹼性之鹼金屬鹽等作為氫產生抑制劑,關於其使用量,可相對於金屬粉微量添
加而使用。
又,收納放熱性組合物之內袋只要具有金屬於氧之存在下可放熱之程度之透氣性即可,例如可使用單面由透氣性包裝用材料所製作且另一面由非透氣性包裝用材料所製作之袋體、或兩面同時由透氣性包裝用材料所製作之袋體等。作為透氣性包裝用材料,例如可使用:織布或不織布、將塑膠薄膜或片材等穿孔所得之多孔質性片材、該等之複合片材、及其他等。又,作為非透氣性包裝用材料,例如可使用:聚乙烯系樹脂、聚丙烯系樹脂、乙烯-丙烯共聚物、乙烯-乙酸乙烯酯共聚物、離子聚合物樹脂、乙烯-丙烯酸乙酯共聚物、乙烯-丙烯酸或甲基丙烯酸共聚物、甲基戊烯聚合物、聚丁烯系樹脂、聚乙酸乙烯酯系樹脂、聚(甲基)丙烯酸系樹脂、聚丙烯腈系樹脂、聚苯乙烯系樹脂、丙烯腈-苯乙烯共聚物(AS系樹脂)、丙烯腈-丁二烯-苯乙烯共聚物(ABS系樹脂)、聚酯系樹脂、聚醯胺系樹脂、聚碳酸酯系樹脂、聚乙烯醇系樹脂、乙烯-乙酸乙烯酯共聚物之皂化物、氟系樹脂、二烯系樹脂、聚縮醛系樹脂、聚胺基甲酸酯系樹脂、硝化纖維素、及其他等公知之樹脂之薄膜或片材。內袋之製造方法可無限制地使用通常公知之方法,例如可較佳地使用關於外袋之製造而於上文中所述之各種熱密封法。
[實施例]
以下,列舉實施例及比較例對本發明進一步具體地說明。
(實施例1)
於具有聚偏二氯乙烯層之雙軸延伸聚丙烯膜(厚度21μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:5g/(m2‧day))之聚偏二氯乙烯層側,使用通常之凹版油墨組合物,藉由凹版印刷方式印刷文字、圖形、記號、圖樣及其他,形成印刷油墨層。繼而,於上述所形成之印刷油墨層上,塗佈醚系接著劑並使其乾燥,形成接著劑層。於
該接著劑層上,以鋁蒸鍍層與接著劑層接觸之方式載置具有鋁之蒸鍍層之未延伸聚丙烯膜(厚度25μm;氧透過度:10cc/(m2‧day‧atm);水蒸氣透過度:0.5g/(m2‧day))進行積層一體化,製造包含雙軸延伸聚丙烯膜/聚偏二氯乙烯層/印刷油墨層/接著劑層/鋁之蒸鍍層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(實施例2)
使用具有聚偏二氯乙烯層之雙軸延伸聚醯胺膜(厚度15μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day))代替具有聚偏二氯乙烯層之雙軸延伸聚丙烯膜(厚度21μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:5g/(m2‧day)),除此以外,以與實施例1相同之方式製造包含雙軸延伸聚醯胺膜/聚偏二氯乙烯層/印刷油墨層/接著劑層/鋁之蒸鍍層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(實施例3)
使用具有聚偏二氯乙烯層之雙軸延伸聚對苯二甲酸乙二酯膜(厚度12μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day))代替具有聚偏二氯乙烯層之雙軸延伸聚丙烯膜(厚度21μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:5g/(m2‧day)),除此以外,以與實施例1相同之方式製造包含雙軸延伸聚對苯二甲酸乙二酯膜/聚偏二氯乙烯層/印刷油墨層/接著劑層/鋁之蒸鍍層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(實施例4)
於作為障壁層之具有聚偏二氯乙烯層之雙軸延伸聚醯胺膜(厚度15μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day))之聚偏二氯乙烯層側,使用通常之凹版油墨組合物,藉由凹版印刷方式印刷文字、圖形、記號、圖樣及其他,形成印刷油墨層。
繼而,於上述所形成之印刷油墨層上,塗佈醚系接著劑並使其乾燥,形成接著劑層。於該接著劑層上,以鋁蒸鍍層與接著劑層接觸之方式載置具有鋁之蒸鍍層之未延伸聚丙烯膜(厚度25μm;氧透過度:10cc/(m2‧day‧atm);水蒸氣透過度:0.5g/(m2‧day))進行積層一體化。又,於雙軸延伸聚醯胺膜上塗佈醚系接著劑並使其乾燥,形成第2接著劑層。於該第2接著劑層上,載置雙軸延伸聚丙烯膜(厚度20μm;氧透過度:1500cc/(m2‧day‧atm);水蒸氣透過度:8g/(m2‧day))作為追加之樹脂層進行積層一體化,製造包含雙軸延伸聚丙烯膜/第2接著劑層/雙軸延伸聚醯胺膜/聚偏二氯乙烯層/印刷油墨層/接著劑層/鋁之蒸鍍層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(實施例5~11)
使用下述表1所示之薄膜代替障壁層之具有聚偏二氯乙烯層之雙軸延伸聚醯胺膜(厚度15μm、8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day)),且使用下述表1所示之薄膜代替追加之樹脂層之雙軸延伸聚丙烯膜(厚度20μm;氧透過度:1500cc/(m2‧day‧atm);水蒸氣透過度:8g/(m2‧day)),除此以外,以與實施例4相同之方式,分別製造拋棄式發熱包外袋用多層膜。
KPET#12:具有聚偏二氯乙烯層之雙軸延伸聚對苯二甲酸乙二酯
膜(厚度12μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day))
KOPP#20:具有聚偏二氯乙烯層之雙軸延伸聚丙烯膜(厚度20μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:5g/(m2‧day))
KONY#15:具有聚偏二氯乙烯層之雙軸延伸聚醯胺膜(厚度15μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:10g/(m2‧day))
OPP#20:雙軸延伸聚丙烯膜(厚度20μm;氧透過度:1500cc/(m2‧day‧atm);水蒸氣透過度:8g/(m2‧day))
PET#12:雙軸延伸聚對苯二甲酸乙二酯膜(厚度12μm;氧透過度:80cc/(m2‧day‧atm);水蒸氣透過度:50g/(m2‧day))
ONY#15:雙軸延伸聚醯胺膜(厚度15μm;氧透過度:30cc/(m2‧day‧atm);水蒸氣透過度:250g/(m2‧day))
(比較例1)
於具有聚偏二氯乙烯層之雙軸延伸聚丙烯膜(厚度21μm;氧透過度:8.1cc/(m2‧day‧atm);水蒸氣透過度:5g/(m2‧day))之聚偏二氯乙烯層側,以與實施例1相同之方式形成印刷油墨層及接著劑層。於該接著劑層上,載置直鏈狀低密度聚乙烯膜(厚度30μm;氧透過度:5000cc/(m2‧day‧atm);水蒸氣透過度:16.6g/(m2‧day))後,與上述同樣地設置接著劑層,進而於其上載置乙烯-乙酸乙烯酯共聚物膜(厚度30μm;氧透過度:10000cc/(m2‧day‧atm);水蒸氣透過度:75g/(m2‧day))進行積層一體化,製造包含雙軸延伸聚丙烯膜/聚偏二氯乙烯層/印刷油墨層/接著劑層/直鏈狀低密度聚乙烯膜/接著劑層/乙烯-乙酸乙烯酯共聚物膜之拋棄式發熱包外袋用多層膜。
(比較例2)
於雙軸延伸聚丙烯膜(厚度20μm;氧透過度:1500cc/(m2‧day‧atm);水蒸氣透過度:8g/(m2‧day))之單面上,以與實施例1相同之方式形成印刷油墨層及接著劑層。於該接著劑層上,以接著劑層與鋁之蒸鍍層接觸之方式載置具有鋁之蒸鍍層之雙軸延伸聚對苯二甲酸乙二酯膜(厚度12μm;氧透過度:1.5cc/(m2‧day‧atm);水蒸氣透過度1.7g/(m2‧day))進行積層一體化。進而,於具有鋁之蒸鍍層之雙軸延伸聚對苯二甲酸乙二酯膜的與鋁之蒸鍍層相反之側形成接著劑層,其後於其上載置直鏈狀低密度聚乙烯膜(厚度30μm;氧透過度:5000cc/(m2‧day‧atm);水蒸氣透過度:16.6g/(m2‧day))進行積層一體化,製造包含雙軸延伸聚丙烯膜/印刷油墨層/接著劑層/鋁之蒸鍍層/雙軸延伸聚對苯二甲酸乙二酯膜/接著劑層/直鏈狀低密度聚乙烯膜之拋棄式發熱包外袋用多層膜。
(比較例3)
於具有氧化矽之蒸鍍層之雙軸延伸聚對苯二甲酸乙二酯膜(厚度12μm;氧透過度:1.5cc/(m2‧day‧atm)、水蒸氣透過度1.7g/(m2‧day))之氧化矽之蒸鍍層側,以與實施例1相同之方式形成印刷油墨層及接著劑層。於該接著劑層上,載置未延伸聚丙烯膜(厚度25μm;氧透過度:2400cc/(m2‧day‧atm);水蒸氣透過度14.4g/(m2‧day))進行積層一體化,製造包含雙軸延伸聚對苯二甲酸乙二酯膜/氧化矽之蒸鍍層/印刷油墨層/接著劑層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(比較例4)
使用具有氧化矽之蒸鍍層之雙軸延伸聚醯胺膜(厚度12μm;氧透過度:2.1cc/(m2‧day‧atm)、水蒸氣透過度4.3g/(m2‧day))代替具有氧化矽之蒸鍍層之雙軸延伸聚對苯二甲酸乙二酯膜(厚度12μm;氧透過度:1.5cc/(m2‧day‧atm)、水蒸氣透過度1.7g/(m2‧day)),除
此以外,以與比較例3相同之方式製造包含雙軸延伸聚醯胺膜/氧化矽之蒸鍍層/印刷油墨層/接著劑層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(比較例5)
於構成比較例3所獲得之拋棄式發熱包外袋用多層膜之雙軸延伸聚對苯二甲酸乙二酯膜上,塗佈醚系接著劑並使其乾燥,形成第2接著劑層。於該第2接著劑層上,載置雙軸延伸聚丙烯膜(厚度20μm;氧透過度:1500cc/(m2‧day‧atm);水蒸氣透過度:8g/(m2‧day))進行積層一體化,製造包含雙軸延伸聚丙烯膜/第2接著劑層/雙軸延伸聚對苯二甲酸乙二酯膜/氧化矽之蒸鍍層/印刷油墨層/接著劑層/未延伸聚丙烯膜之拋棄式發熱包外袋用多層膜。
(比較例6)
使用直鏈狀低密度聚乙烯膜(厚度30μm;氧透過度:5000cc/(m2‧day‧atm);水蒸氣透過度:16.6g/(m2‧day))代替未延伸聚丙烯膜(厚度25μm;氧透過度:2400cc/(m2‧day‧atm);水蒸氣透過度:14.4g/(m2‧day)),除此以外,以與比較例5相同之方式製造包含雙軸延伸聚丙烯膜/第2接著劑層/雙軸延伸聚對苯二甲酸乙二酯膜/氧化矽之蒸鍍層/印刷油墨層/接著劑層/直鏈狀低密度聚乙烯膜之拋棄式發熱包外袋用多層膜。
(評價)
使用實施例1及比較例1~6所製造之拋棄式發熱包外袋用多層膜,如以下般進行氧透過度、水蒸氣透過度及外觀評價。
(1)氧透過度之測定
於以下溫度及濕度之條件下,於以下測定條件下使用以下測定機械測定氧透過度(cc/(m2‧day‧atm))。
溫度:20℃;濕度:90%RH;
測定機械:MOCON(mocon)公司製造OX-TRAN 2/20;測定方法:每隔30分鐘 連續測定20次
(2)水蒸氣透過度之測定
於以下溫度及濕度之條件下,於以下測定條件下使用以下測定機械測定水蒸氣透過度(g/(m2‧day))。
溫度:40℃;濕度:90%RH;
測定機械:MOCON(mocon)公司製造OX-TRAN 2/20;測定方法:每隔30分鐘 連續測定20次
(3)加速試驗後之外觀之評價
分別準備2片實施例1及比較例1~6之拋棄式發熱包外袋用多層膜,使密封劑層之熱熔性基材(實施例1、比較例3~5:未延伸聚丙烯膜;比較例1:乙烯-乙酸乙烯酯共聚物膜;比較例2及6:直鏈狀低密度聚乙烯膜)之面相對向而重疊後,製造對其外周緣部進行三方熱密封而形成密封部、並且上方具有開口部之三方熱密封型之拋棄式發熱包外袋。
製備包含鐵粉22g、活性碳6g、保水劑6g、水10g之放熱性組合物,繼而,將該放熱性組合物填充包裝至包含單面包含聚乙烯膜之透氣性多孔質內袋、且另一面包含聚乙烯膜之非透氣性內袋中,製造包含單個包裝體之黏貼型拋棄式發熱包。
繼而,自上述製造之拋棄式發熱包外袋之開口部,填充上述製造之包含單個包裝體之拋棄式發熱包,其後,將該開口部進行熱密封而形成上方密封部,製造拋棄式發熱包製品。
將5片以此種方式所獲得之拋棄式發熱包製品重疊並載置於台上,對重疊5片之狀態下之高度(mm)(以下設為「高度H1(mm)」)進行測定。繼而,將拋棄式發熱包製品於重疊5片之狀態下於50℃之溫度下保存3個月,於3個月之期間中,每隔1週對重疊5片之狀態下之高度
(mm)進行測定。繼而,將經過3個月後之高度設為「高度H2(mm)」。其中,於保存期間中拋棄式發熱包製品之外袋膨脹而破損之情形時,將破損前最大之高度設為「高度H2(mm)」。繼而,算出H2-H1(mm)之值,對照以下基準進行加速試驗後之外觀之評價。
-2<H2-H1(mm)<2:無變化
-5<H2-H1(mm)≦-2:稍許負壓傾向
H2-H1(mm)≦-5:負壓傾向
2≦H2-H1(mm)<5:稍許膨脹傾向
5≦H2-H1(mm):膨脹傾向
(4)加速試驗後之放熱性能(持續時間)之評價
以與上述「(3)加速試驗後之外觀之評價」相同之方式製造拋棄式發熱包製品。
針對10個以此種方式所獲得之拋棄式發熱包製品,將拋棄式發熱包外袋開封,取出拋棄式發熱包,根據JIS S4100對作為拋棄式發熱包之放熱性能進行試驗。將其持續時間之平均值設為「放熱性能(持續時間)‧初期」(以下設為「持續時間T1」)。
另一方面,針對10個按上述方式所獲得之拋棄式發熱包製品,於50℃之溫度下保存3個月,其後將拋棄式發熱包外袋開封,取出拋棄式發熱包,根據JIS S4100對作為拋棄式發熱包之放熱性能進行試驗。將其持續時間之平均值設為「放熱性能(持續時間)‧加速試驗後」(以下設為「持續時間T2」)。
繼而,算出T2/T1×100(%)之值,對照以下基準進行加速試驗後之放熱性能(持續時間)之評價。
90<T2/T1×100(%)≦100:○(良好)
80<T2/T1×100(%)≦90:△(可使用)
T2/T1×100(%)≦80:×(不適合作為製品)
熱密封部因膨脹而破損,製品於開封前結束放熱:-(不適合作為製品)
只要上述評價為「無變化」,則即便將拋棄式發熱包製品長時間保存之後,外觀亦無變化,可作為商品於市場中進行售賣。另一方面,若上述評價為「稍許負壓傾向」、「負壓傾向」、「稍許膨脹傾向」或「膨脹傾向」,則將拋棄式發熱包製品長時間保存之後外觀發生變化而欠佳。
根據上述表2之結果,於實施例1中,加速試驗前後之包裝製品之外觀無變化,即便於長時間保存之後,放熱功能亦無劣化。又,於實施例1中,拋棄式發熱包外袋之水蒸氣透過度較低而不易透過水蒸氣,故而水分不易自外部向外袋內部滲入,又,作為拋棄式發熱包之成分而包含之水分不易向外部散發,即便於長時間保存之後,亦作為拋棄式發熱包而充分地發揮作用。另一方面,比較例1~6均係加速試驗前後之包裝製品之外觀發生變化,於將拋棄式發熱包製品長時間保存之後,成為外觀上欠佳之狀態。又,於比較例1及4中,外包裝材之水蒸氣透過度稍高而容易透過水蒸氣,故而水分容易自外部向外袋內部滲入,又,作為拋棄式發熱包之放熱性組合物成分而包含之水分容
易向外部散發,於長時間保存之後未作為拋棄式發熱包而充分地放熱。又,於比較例2及6中,可見明顯之膨脹傾向,熱密封部分因該膨脹而破損,於製品開封前發熱包與外部大氣接觸而已結束放熱。
又,填充包裝至包含單面包含聚乙烯膜之透氣性穿孔內袋、且另一面包含聚乙烯膜之非透氣性內袋中,製造包含單個包裝體之非黏貼型拋棄式發熱包,並進行與實施例1相同之試驗,與實施例1同樣地成為良好之結果。
10‧‧‧密封劑層
11‧‧‧熱熔性樹脂基材
12‧‧‧蒸鍍層
20‧‧‧障壁層
21‧‧‧耐熱性樹脂基材
22‧‧‧聚偏二氯乙烯層
30‧‧‧接著劑層
40‧‧‧印刷油墨層
Claims (8)
- 一種拋棄式發熱包外袋用多層膜,其特徵在於:包含於基材上蒸鍍金屬或金屬氧化物而成之蒸鍍層、及於基材上塗佈聚偏二氯乙烯而成之聚偏二氯乙烯層。
- 如請求項1之拋棄式發熱包外袋用多層膜,其中上述蒸鍍層為於熱熔性樹脂基材之至少一面上蒸鍍金屬或金屬氧化物而成之密封劑層,上述聚偏二氯乙烯層為於耐熱性樹脂基材之至少一面上塗佈聚偏二氯乙烯而成之障壁層。
- 如請求項1或2之拋棄式發熱包外袋用多層膜,其中上述蒸鍍層係於選自未延伸聚丙烯、雙軸延伸聚丙烯、未延伸聚乙烯、低密度聚乙烯、中密度聚乙烯、高密度聚乙烯及直鏈狀(線狀)低密度聚乙烯中之上述基材或上述熱熔性樹脂基材上蒸鍍金屬或金屬氧化物而成。
- 如請求項1至3中任一項之拋棄式發熱包外袋用多層膜,其中上述蒸鍍層係於選自未延伸聚丙烯、雙軸延伸聚丙烯、未延伸聚乙烯、低密度聚乙烯、中密度聚乙烯、高密度聚乙烯及直鏈狀(線狀)低密度聚乙烯中之上述基材或上述熱熔性樹脂基材上蒸鍍鋁而成,上述聚偏二氯乙烯層係於選自雙軸延伸聚丙烯、雙軸延伸聚對苯二甲酸乙二酯及雙軸延伸聚醯胺樹脂中之上述基材或上述耐熱性樹脂基材上塗佈聚偏二氯乙烯樹脂而成。
- 如請求項1至4中任一項之拋棄式發熱包外袋用多層膜,其於上述蒸鍍層與上述聚偏二氯乙烯層之間進而包含接著劑層。
- 如請求項1至5中任一項之拋棄式發熱包外袋用多層膜,其包含追加之樹脂層。
- 如請求項1至6中任一項之拋棄式發熱包外袋用多層膜,其於20 ℃、90%RH下所測得之氧透過度為1.5~5.0cc/(m2‧day‧atm),於40℃、90%RH下所測得之水蒸氣透過度為0.05~1.5g/(m2‧day)。
- 一種拋棄式發熱包,其係於將如請求項1至7中任一項之拋棄式發熱包外袋用多層膜熱熔而形成之外袋中,密封包裝收納有放熱性組合物之內袋而成。
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JP2017217878A (ja) * | 2016-06-10 | 2017-12-14 | 三菱ケミカル株式会社 | 熱収縮性積層フィルム、及び該フィルムを用いた包装資材 |
US10640277B2 (en) | 2017-06-01 | 2020-05-05 | Chef Pack, Llc | Packaging for a food item |
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US5763033A (en) * | 1996-01-30 | 1998-06-09 | Becton, Dickinson And Company | Blood collection tube assembly |
JP2002086607A (ja) | 2000-09-13 | 2002-03-26 | Dainippon Printing Co Ltd | ケミカルカイロ用外袋構成包材およびそれを使用したケミカルカイロ用外袋 |
JP2002086614A (ja) * | 2000-09-19 | 2002-03-26 | Dainippon Printing Co Ltd | 積層用2軸延伸ポリアミドフィルムおよびそれを用いたレトルトパウチ |
JP4774587B2 (ja) | 2000-10-13 | 2011-09-14 | 大日本印刷株式会社 | ケミカルカイロ用外袋構成包材およびそれを使用したケミカルカイロ用外袋 |
WO2005013869A1 (ja) * | 2003-08-11 | 2005-02-17 | Mycoal Products Corporation | 発熱体 |
JP4749050B2 (ja) * | 2005-06-15 | 2011-08-17 | 花王株式会社 | 包装袋 |
JP2007136736A (ja) * | 2005-11-15 | 2007-06-07 | Dainippon Printing Co Ltd | 積層材およびそれを使用した包装用袋 |
JP4730964B2 (ja) | 2006-09-15 | 2011-07-20 | 株式会社ナカヨ通信機 | 簡易電話会議装置 |
JP5515194B2 (ja) * | 2006-09-26 | 2014-06-11 | 大日本印刷株式会社 | バリア性共押出多層シーラントフィルムを用いた包装材料、包装袋および包装製品 |
JP2008143103A (ja) * | 2006-12-12 | 2008-06-26 | Dainippon Printing Co Ltd | ガスバリア性積層フィルム |
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CN202637227U (zh) * | 2012-03-28 | 2013-01-02 | 浙江安南炭业科技有限公司 | 一种竹炭暖贴 |
US9024360B1 (en) * | 2014-02-17 | 2015-05-05 | Sonoco Development, Inc. | Container having self-contained heater material |
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EP3196145A1 (en) | 2017-07-26 |
CN106660675B (zh) | 2019-08-30 |
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