CN112874098A - 一种适用于高温杀菌的复合包装膜及其制备方法 - Google Patents
一种适用于高温杀菌的复合包装膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及包装膜领域,尤指一种适用于高温杀菌的复合包装膜及其制备方法。包括上膜和下膜,所述上膜和下膜的边缘处通过热压或黏合相互连接,并且互相包围形成容纳腔;所述上膜由外至内依次包括聚烯烃膜层、聚酰胺膜层和聚丙烯膜层,所述下膜由外至内依次包括乙烯‑乙烯醇共聚物膜层、聚烯烃膜层和聚丙烯膜层,所述上膜为平整状态,所述下膜呈凸起状态。本发明适用于高温杀菌的复合包装膜外观的卷曲和平整度有明显的改善,提升产品的包装档次。其中,采用本发明的复合包装膜制备方法,可以达到每层材料的收缩率和应力的一致性,应用于高温杀菌后,包装膜平整不卷曲。
Description
技术领域
本发明涉及包装膜领域,尤指一种适用于高温杀菌的复合包装膜及其制备方法。
背景技术
塑料包装及塑料包装产品在市场上所占的份额越来越大,特别是复合塑料软包装,已经广泛地应用于食品、医药、化工等领域,这些包装产品都给我们的生活带来了极大的便利。
耐高温杀菌拉伸膜包装分为上膜和下膜,应用范围:肉类、海产品、休闲食品类等需要杀菌的产品上,现有材料结构存在的问题:材料之间的收缩率、表面张力、复合应力不同,因此卷曲和平整度不好,导致产品包装也不美观。
发明内容
为解决上述问题,本发明提供一种一种适用于高温杀菌的复合包装膜,平整度好,不卷曲,提高产品包装档次。
为实现上述目的,本发明采用的技术方案是:一种适用于高温杀菌的复合包装膜,包括上膜和下膜,所述上膜和下膜的边缘处通过热压或黏合相互连接,并且互相包围形成容纳腔;所述上膜由外至内依次包括聚烯烃膜层、聚酰胺膜层和聚丙烯膜层,所述下膜由外至内依次包括乙烯-乙烯醇共聚物膜层、聚烯烃膜层和聚丙烯膜层,所述上膜为平整状态,所述下膜呈凸起状态。
进一步地,所述上膜的聚丙烯膜层的内侧面还印刷有油墨层。
进一步地,所述聚烯烃膜层采用低密度聚乙烯膜、高密度聚乙烯膜、聚丙烯膜或改性烯烃共聚物膜。
进一步地,所述下膜凸起形状与容纳腔内的物品相对应,并且上膜的最外层还印刷有图案。
进一步地,所述上膜的聚烯烃膜层、聚酰胺膜层和聚丙烯膜层之间均通过聚氨酯层或环氧树脂胶粘层胶粘连接,所述下膜的乙烯-乙烯醇共聚物膜层、聚烯烃膜层和聚丙烯膜层之间均通过聚氨酯层或环氧树脂胶粘层胶粘连接。
还提供一种适用于高温杀菌的复合包装膜制备方法,包括上膜和下膜的制备,其制备方法步骤如下:
S1印刷,上膜使用无苯无酮油墨在聚丙烯膜层的电晕面上印刷;
S2复合,在上膜的聚丙烯膜层的电晕面涂覆胶水后再涂覆聚酰胺,然后再次涂覆胶水后再涂覆聚丙烯;在下膜的聚丙烯膜层的电晕面涂覆胶水后再涂覆聚丙烯,然后再次涂覆胶水后再涂覆乙烯-乙烯醇共聚物热熔胶;
S3分切,根据需要的规格采用分切机进行分切;
S4包装,最后进行卷装。
具体地,在步骤S1中,印刷的达因值≥40。
具体地,在步骤S2中,胶水的上胶量为3.0-3.5g/m2,高温熟化48小时,胶水交联率为99-100%,剥离强度≥3-5N/mm。
具体地,在步骤S2中,采用的胶水均为聚氨酯胶水或环氧树脂胶水。
具体地,在步骤S3中,经过步骤S2高温熟化后的半成品,还需要在高温下放置24h,待胶水反应交联完成后,需要经过烘箱收卷后,冷却48h后,再进行分切。
本发明的有益效果在于:本发明适用于高温杀菌的复合包装膜外观的卷曲和平整度有明显的改善,提升产品的包装档次。其中,采用本发明的复合包装膜制备方法,可以达到每层材料的收缩率和应力的一致性,应用于高温杀菌后,包装膜平整不卷曲。
附图说明
图1是本实施例的结构示意图。
图2是本实施例上膜的剖视图。
图3是本实施例下膜的剖视图。
附图标号说明:1.上膜;2.下膜;3.容纳腔;4.聚烯烃膜层;5.聚酰胺膜层;6.聚丙烯膜层;7.乙烯-乙烯醇共聚物膜层;8.油墨层;9.聚氨酯层或环氧树脂胶粘层;10.图案。
具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。本申请可以以多种不同的形式来实现,并不限于本实施例所描述的实施方式。提供以下具体实施方式的目的是便于对本申请公开内容更清楚透彻的理解,其中上、下、左、右等指示方位的字词仅是针对所示结构在对应附图中位置而言。
请参阅图1-3所示,本发明关于一种适用于高温杀菌的复合包装膜,包括上膜1和下膜2,所述上膜1和下膜2的边缘处通过热压或黏合相互连接,并且互相包围形成容纳腔3;所述上膜1由外至内依次包括聚烯烃膜层4、聚酰胺膜层5和聚丙烯膜层6,所述下膜2由外至内依次包括乙烯-乙烯醇共聚物膜层7、聚烯烃膜层4和聚丙烯膜层6,所述上膜2为平整状态,所述下膜1呈凸起状态,所述下膜2凸起形状与容纳腔3内的物品相对应,并且上膜1的最外层还可以印刷有图案10。
在本实施例中,所述上膜1的聚丙烯膜层6的内侧面还印刷有油墨层8。其中,所述聚烯烃膜层4采用低密度聚乙烯膜、高密度聚乙烯膜、聚丙烯膜或改性烯烃共聚物膜。
在本实施例中,所述上膜1的聚烯烃膜层4、聚酰胺膜层5和聚丙烯膜层6之间均通过聚氨酯层或环氧树脂胶粘层7胶粘连接,所述下膜2的乙烯-乙烯醇共聚物膜层7、聚烯烃膜层4和聚丙烯膜层6之间均通过聚氨酯层或环氧树脂胶粘层9胶粘连接。此处优选环氧树脂胶粘层,通过环氧树脂胶粘剂将各个不同的功能层相互粘合联结。环氧树脂胶粘剂为软性胶粘剂,不易受紫外线照射而硬化,因此采用环氧树脂胶粘剂粘合的薄膜更容易弯曲,且胶粘牢固。
上述复合包装膜制备方法步骤如下:
S1印刷,上膜1使用无苯无酮油墨在聚丙烯膜层6的电晕面上印刷,印刷的达因值≥40;
S2复合,在上膜1的聚丙烯膜层6的电晕面涂覆胶水后再涂覆聚酰胺,然后再次涂覆胶水后再涂覆聚丙烯;在下膜2的聚丙烯膜层6的电晕面涂覆胶水后再涂覆聚丙烯,然后再次涂覆胶水后再涂覆乙烯-乙烯醇共聚物热熔胶;
S3分切,根据需要的规格采用分切机进行分切;
S4包装,最后进行卷装。
其中,在步骤S2中,胶水的上胶量为3.0-3.5g/m2,高温熟化48小时,胶水交联率为99-100%,剥离强度≥3-5N/mm;在步骤S3中,经过步骤S2高温熟化后的半成品,消除应力的方法为:还需要在高温下放置24h,待胶水反应交联完成后,需要经过烘箱收卷后,冷却48h后,再进行分切。此外,采用的胶水均为聚氨酯胶水或环氧树脂胶水。本实施例方法所制备的复合包装膜材料断裂伸长率为MD560/TD620,表面张力38-52。
需要进一步说明的是,除非另有明确的规定和限定,术语“连接”“固定”“设置”等术语应做广义理解,对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本发明中的具体含义。
以上实施方式仅仅是对本发明的优选实施方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通工程技术人员对本发明的技术方案作出的各种变形和改进,均应落入本发明的权利要求书确定的保护范围内。
Claims (10)
1.一种适用于高温杀菌的复合包装膜,其特征在于:包括上膜和下膜,所述上膜和下膜的边缘处通过热压或黏合相互连接,并且互相包围形成容纳腔;所述上膜由外至内依次包括聚烯烃膜层、聚酰胺膜层和聚丙烯膜层,所述下膜由外至内依次包括乙烯-乙烯醇共聚物膜层、聚烯烃膜层和聚丙烯膜层,所述上膜为平整状态,所述下膜呈凸起状态。
2.根据权利要求1所述的一种适用于高温杀菌的复合包装膜,其特征在于:所述上膜的聚丙烯膜层的内侧面还印刷有油墨层。
3.根据权利要求1所述的一种适用于高温杀菌的复合包装膜,其特征在于:所述聚烯烃膜层采用低密度聚乙烯膜、高密度聚乙烯膜、聚丙烯膜或改性烯烃共聚物膜。
4.根据权利要求1所述的一种适用于高温杀菌的复合包装膜,其特征在于:所述下膜凸起形状与容纳腔内的物品相对应,并且上膜的最外层还印刷有图案。
5.根据权利要求1所述的一种适用于高温杀菌的复合包装膜,其特征在于:所述上膜的聚烯烃膜层、聚酰胺膜层和聚丙烯膜层之间均通过聚氨酯层或环氧树脂胶粘层胶粘连接,所述下膜的乙烯-乙烯醇共聚物膜层、聚烯烃膜层和聚丙烯膜层之间均通过聚氨酯层或环氧树脂胶粘层胶粘连接。
6.一种适用于高温杀菌的复合包装膜制备方法,其特征在于:包括上膜和下膜的制备,其制备方法步骤如下:
S1印刷,上膜使用无苯无酮油墨在聚丙烯膜层的电晕面上印刷;
S2复合,在上膜的聚丙烯膜层的电晕面涂覆胶水后再涂覆聚酰胺,然后再次涂覆胶水后再涂覆聚丙烯;在下膜的聚丙烯膜层的电晕面涂覆胶水后再涂覆聚丙烯,然后再次涂覆胶水后再涂覆乙烯-乙烯醇共聚物热熔胶;
S3分切,根据需要的规格采用分切机进行分切;
S4包装,最后进行卷装。
7.根据权利要求6所述的一种适用于高温杀菌的复合包装膜制备方法,其特征在于:在步骤S1中,印刷的达因值≥40。
8.根据权利要求6所述的一种适用于高温杀菌的复合包装膜制备方法,其特征在于:在步骤S2中,胶水的上胶量为3.0-3.5g/m2,高温熟化48小时,胶水交联率为99-100%,剥离强度≥3-5N/mm。
9.根据权利要求6所述的一种适用于高温杀菌的复合包装膜制备方法,其特征在于:在步骤S2中,采用的胶水均为聚氨酯胶水或或环氧树脂胶水。
10.根据权利要求6所述的一种适用于高温杀菌的复合包装膜制备方法,其特征在于:在步骤S3中,经过步骤S2高温熟化后的半成品,还需要在高温下放置24h,待胶水反应交联完成后,需要经过烘箱收卷后,冷却48h后,再进行分切。
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