CN111645289A - 镀铝复合用聚酯薄膜在线表面处理及其加工方法 - Google Patents
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Abstract
本发明涉及镀铝复合技术领域,尤其为镀铝复合用聚酯薄膜在线表面处理及其加工方法,选取聚酯薄膜基材,再对所选基材进行结晶干燥,随后进行熔融挤出,并在急冷辊上急速冷却形成铸片,通过纵向拉伸后的薄膜表面先经电晕处理,再通过自行设计的在线表面处理设备在电晕处理面均匀地涂上水性混合溶剂,上述混合溶剂在横向拉伸过程经干燥挥发后,在薄膜表面形成均匀的表面处理层,薄膜成型后进行收卷,并按客户要求分切和包装,最后进行测试合格,本发明中,聚酯薄膜通过在自行设计的在线表面处理设备对薄膜进行表面处理后,增强了薄膜表面与镀铝层的附着力,同时提高了镀铝复合膜对空气和水蒸汽的阻隔性,确保了食品包装的安全性和保鲜性。
Description
技术领域
本发明涉及镀铝复合技术领域,具体为镀铝复合用聚酯薄膜在线表面处理及其加工方法。
背景技术
目前聚酯薄膜镀铝通用的做法是采用在薄膜表面进行电晕处理的技术方案,为了达到高温消毒和超高温灭菌的要求,目前市场上大多使用铝萡结构的包装材料,随着社会的发展,我国对食品包装材料的要求在不断的提高,同时对食品包装的安全也提出了一系列的环保要求,常规电晕处理的聚酯薄膜在镀铝复合制袋后经过巴氏消毒或高温消毒后容易出现铝层脱落现象,使阻隔性大大降低,且无法用于液体包装,无法充分满足食品包装的安全性和功能性,而铝萡结构的包装材料则成本高,不便于使用,因此,针对上述问题提出镀铝复合用聚酯薄膜在线表面处理及其加工方法。
发明内容
本发明的目的在于提供镀铝复合用聚酯薄膜在线表面处理及其加工方法,采用常规的聚酯薄膜在镀铝复合制袋后经过高温消毒后容易出现铝层脱落现象,通过本发明的在线表面处理及其加工方法,可增强聚酯薄膜与铝层的附着力,提高聚酯薄膜的阻隔性能,从而满足食品包装的安全和环保要求,以及某些高端电子产品包装的阻隔要求。本发明的在线表面处理聚酯薄膜经镀铝复合后可替代铝萡结构用于高温消毒杀菌(121℃、30min)和超高温灭菌(135℃~150℃,2s),大大节省了包装成本,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:
镀铝复合用聚酯薄膜在线表面处理及其加工方法,包括以下步骤:
步骤一:选取聚酯薄膜基材,基材为聚对苯二甲酸乙二醇酯(PET),基材厚度8~50μm,混合溶剂中水性丙烯酸树脂、催化剂、固化剂、功能助剂和纯水的重量百分比分别为40~50%:1~2.5%:2~4%:1~3%:40~55%;
步骤二:对所选基材进行结晶干燥,结晶温度为160~170℃,干燥温度为165~175℃,干燥时间为4~6小时;
步骤三:对结晶干燥后的基材进行熔融挤出,基材通过挤出机、计量泵和熔体管道最后通过模头进行挤出;
步骤四:熔体经模头挤出后在20~25℃急冷辊上急速冷却形成铸片;
步骤五:将纵拉机的温度设为60~90℃,拉伸倍数设为3.0~3.4倍,对铸片进行纵向拉伸;
步骤六:纵向拉伸后的薄膜表面先经电晕处理,再通过自行设计的在线表面处理设备在电晕处理面均匀地涂上水性混合溶剂,在线表面处理层厚度2.5~5μm;
步骤七:上述混合溶剂在横向拉伸过程经干燥挥发后,在薄膜表面形成均匀的表面处理层,拉伸温度120~150℃,拉伸倍数3.0~3.5倍,定型温度220~245℃;
步骤八:薄膜成型后进行收卷,并按客户要求分切和包装;
步骤九:在线表面处理聚酯薄膜通过与EAA膜热封后进行剥离测试,不出现脱铝现象;该镀铝膜经过水浸泡和100℃水煮30min均未出现脱铝现象;该镀铝膜与PA膜或CPP膜复合后经过高温消毒(121℃、30min)和超高温灭菌法(135℃~150℃,2s)未出现脱铝现象,产品合格。
优选的,所述聚酯薄膜基材为ABA三层结构,中间B层使用100%膜级有光聚酯切片,面层A层使用95%~98%膜级有光聚酯切片和2%~5%亚光切片。
优选的,所述在熔融挤出过程中,熔融温度为275~290℃,挤出速度为30~50r/min。
优选的,所述在进行横向拉伸操作前,需要先进行预热,横向拉伸预热温度为100~120℃。
与现有技术相比,本发明的有益效果是:
本发明中,聚酯薄膜通过在自行设计的在线表面处理设备对薄膜进行表面处理后,增强了薄膜表面与镀铝层的附着力,同时提高了镀铝复合膜对空气和水蒸汽的阻隔性,确保了食品包装的安全性和保鲜性。可替代铝萡结构用于高温消毒杀菌和超高温灭菌,从而大大降低了该类包装用途的成本。
附图说明
图1为本发明的整体工作流程示意图。
具体实施方式
实施例1:
请参阅图1,本发明提供一种技术方案:
镀铝复合用聚酯薄膜在线表面处理及其加工方法,包括以下步骤:
步骤一:选取聚酯薄膜基材,基材为聚对苯二甲酸乙二醇酯(PET),基材厚度8μm,混合溶剂中水性丙烯酸树脂、催化剂、固化剂、功能助剂和纯水的重量百分比分别为42%:1%:2%:1%:44%;
步骤二:对所选基材进行结晶干燥,结晶温度为160℃,干燥温度为165℃,干燥时间为4小时;
步骤三:对结晶干燥后的基材进行熔融挤出,基材通过挤出机、计量泵和熔体管道最后通过模头进行挤出,在熔融挤出过程中,熔融温度为275℃,挤出速度为30r/min;
步骤四:熔体经模头挤出后在20℃急冷辊上急速冷却形成铸片;
步骤五:将纵拉机的温度设为60℃,拉伸倍数设为3.0倍,对铸片进行纵向拉伸;
步骤六:纵向拉伸后的薄膜表面先经电晕处理,再通过自行设计的在线表面处理设备在电晕处理面均匀地涂上水性混合溶剂,在线表面处理层厚度2.5μm;
步骤七:上述混合溶剂在横向拉伸过程经干燥挥发后,在薄膜表面形成均匀的表面处理层,拉伸温度120℃,拉伸倍数3.0倍,定型温度220℃,在进行横向拉伸操作前,需要先进行预热,横向拉伸预热温度为100℃;
步骤八:薄膜成型后进行收卷,并按客户要求分切和包装;
步骤九:在线表面处理聚酯薄膜通过与EAA膜热封后进行剥离测试,不出现脱铝现象;该镀铝膜经过水浸泡和100℃水煮30min均未出现脱铝现象;该镀铝膜与PA膜或CPP膜复合后经过高温消毒(121℃、30min)和超高温灭菌法(135℃~150℃,2s)未出现脱铝现象,产品合格。
所述聚酯薄膜基材为ABA三层结构,中间B层使用100%膜级有光聚酯切片,面层A层使用95%膜级有光聚酯切片和2%亚光切片。
在三层共挤双向拉伸聚酯薄膜的生产流程中增加在线表面处理,即在纵向拉伸之后通过自行设计的在线表面处理设备对薄膜进行表面处理,表面处理层所用的混合溶剂由水性丙烯酸树脂、催化剂、固化剂和功能助剂配制而成,可替代铝萡结构用于高温消毒杀菌和超高温灭菌,大大降低了该类包装用途的成本。
实施例2:
请参阅图1,本发明提供一种技术方案:
镀铝复合用聚酯薄膜在线表面处理及其加工方法,包括以下步骤:
步骤一:选取聚酯薄膜基材,基材为聚对苯二甲酸乙二醇酯(PET),基材厚度12μm,混合溶剂中水性丙烯酸树脂、催化剂、固化剂、功能助剂和纯水的重量百分比分别为45%:1.5%:2.5%:2%:49%;
步骤二:对所选基材进行结晶干燥,结晶温度为160~170℃,干燥温度为170℃,干燥时间为5.5小时;
步骤三:对结晶干燥后的基材进行熔融挤出,基材通过挤出机、计量泵和熔体管道最后通过模头进行挤出,在熔融挤出过程中,熔融温度为285℃,挤出速度为40r/min;
步骤四:熔体经模头挤出后在25℃急冷辊上急速冷却形成铸片;
步骤五:将纵拉机的温度设为70℃,拉伸倍数设为3.2倍,对铸片进行纵向拉伸;
步骤六:纵向拉伸后的薄膜表面先经电晕处理,再通过自行设计的在线表面处理设备在电晕处理面均匀地涂上水性混合溶剂,在线表面处理层厚度3.5μm;
步骤七:上述混合溶剂在横向拉伸过程经干燥挥发后,在薄膜表面形成均匀的表面处理层,拉伸温度130℃,拉伸倍数3.3倍,定型温度240℃,在进行横向拉伸操作前,需要先进行预热,横向拉伸预热温度为110℃;
步骤八:薄膜成型后进行收卷,并按客户要求分切和包装;
步骤九:在线表面处理聚酯薄膜通过与EAA膜热封后进行剥离测试,不出现脱铝现象;该镀铝膜经过水浸泡和100℃水煮30min均未出现脱铝现象;该镀铝膜与PA膜或CPP膜复合后经过高温消毒(121℃、30min)和超高温灭菌法(135℃~150℃,2s)未出现脱铝现象,产品合格。
所述聚酯薄膜基材为ABA三层结构,中间B层使用100%膜级有光聚酯切片,面层A层使用97%膜级有光聚酯切片和3%亚光切片。
在三层共挤双向拉伸聚酯薄膜的生产流程中增加在线表面处理,即在纵向拉伸之后通过自行设计的在线表面处理设备对薄膜进行表面处理,表面处理层所用的混合溶剂由水性丙烯酸树脂、催化剂、固化剂和功能助剂配制而成,可替代铝萡结构用于高温消毒杀菌和超高温灭菌,大大降低了该类包装用途的成本。
本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实例的说明只是用于帮助理解本发明的方法及其核心思想。以上所述仅是本发明的优选实施方式,应当指出,由于文字表达的有限性,而客观上存在无限的具体结构,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进、润饰或变化,也可以将上述技术特征以适当的方式进行组合;这些改进润饰、变化或组合,或未经改进将发明的构思和技术方案直接应用于其它场合的,均应视为本发明的保护范围。
Claims (4)
1.镀铝复合用聚酯薄膜在线表面处理及其加工方法,其特征在于,包括以下步骤:
步骤一:选取聚酯薄膜基材,基材为聚对苯二甲酸乙二醇酯(PET),基材厚度8~50μm,混合溶剂中水性丙烯酸树脂、催化剂、固化剂、功能助剂和纯水的重量百分比分别为40~50%:1~2.5%:2~4%:1~3%:40~55%;
步骤二:对所选基材进行结晶干燥,结晶温度为160~170℃,干燥温度为165~175℃,干燥时间为4~6小时;
步骤三:对结晶干燥后的基材进行熔融挤出,基材通过挤出机、计量泵和熔体管道最后通过模头进行挤出;
步骤四:熔体经模头挤出后在20~25℃急冷辊上急速冷却形成铸片;
步骤五:将纵拉机的温度设为60~90℃,拉伸倍数设为3.0~3.4倍,对铸片进行纵向拉伸;
步骤六:纵向拉伸后的薄膜表面先经电晕处理,再通过自行设计的在线表面处理设备在电晕处理面均匀地涂上水性混合溶剂,在线表面处理层厚度2.5~5μm;
步骤七:上述混合溶剂在横向拉伸过程经干燥挥发后,在薄膜表面形成均匀的表面处理层,拉伸温度120~150℃,拉伸倍数3.0~3.5倍,定型温度220~245℃;
步骤八:薄膜成型后进行收卷,并按客户要求分切和包装;
步骤九:在线表面处理聚酯薄膜通过与EAA膜热封后进行剥离测试,不出现脱铝现象;该镀铝膜经过水浸泡和100℃水煮30min均未出现脱铝现象;该镀铝膜与PA膜或CPP膜复合后经过高温消毒(121℃、30min)和超高温灭菌法(135℃~150℃,2s)未出现脱铝现象,产品合格。
2.根据权利要求1所述的镀铝复合用聚酯薄膜在线表面处理及其加工方法,其特征在于:所述聚酯薄膜基材为ABA三层结构,中间B层使用100%膜级有光聚酯切片,面层A层使用95%~98%膜级有光聚酯切片和2%~5%亚光切片。
3.根据权利要求1所述的镀铝复合用聚酯薄膜在线表面处理及其加工方法,其特征在于:所述在熔融挤出过程中,熔融温度为275~290℃,挤出速度为30~50r/min。
4.根据权利要求1所述的镀铝复合用聚酯薄膜在线表面处理及其加工方法,其特征在于:所述在进行横向拉伸操作前,需要先进行预热,横向拉伸预热温度为100~120℃。
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