CN110861380A - 一种单一材料复合可回收冷冻食品包装膜及其制备方法 - Google Patents
一种单一材料复合可回收冷冻食品包装膜及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种单一材料复合可回收冷冻食品包装膜,从上至下依次包括表层和热封层,所述表层和热封层通过胶黏剂复合在一起;其中,所述表层为经过电子交联处理的BOPE膜,厚度为20‑50um;所述热封层为普通PE膜,厚度为40‑80um;所述胶黏剂为无溶剂聚氨酯胶黏剂,含量低于包装膜原料总含量的1%。本发明采用单一的PE膜制作表层和热封层,回收时可直接回收而无需分离处理,从而简化了回收工序,降低了回收成本。本发明还提供了上述包装膜的制备方法,通过对表层PE膜进行双向拉伸与电子交联处理相结合的方式,大大提高了包装膜的粘合度、耐刺穿性能和耐热性能。
Description
技术领域
本发明涉及包装膜技术领域,特别涉及一种单一材料复合可回收冷冻食品包装膜及其制备方法。
背景技术
在食品包装领域,常采用聚乙烯通过共挤的方式制作包装膜,但是由于聚乙烯共挤膜的抗穿刺力较差,容易破损,导致食品在储存和运输过程发生渗漏或氧化而造成损失,特别是对于冷冻食品来说,这个问题尤为突出。
为了改善上述问题,中国专利公开号为CN103481620B的发明-PE液体包装膜及其制备方法,通过在各层的PE母粒中添加碳酸钙、乙烯-醋酸乙烯共聚物、苯乙烯-顺丁烯二酸酐共聚物等助剂进行改性;中国专利公开号为CN 108032577A的发明-高强度洁净PE薄膜及其制备方法,则是通过在内层及外层中增加高压低密度聚乙烯材料可达到对其改性的目的,虽然都极大地增强其抗刺穿能力,但是,前者过多的助剂添加大大增加了后期回收PE粒子的难度,后者不同类别的聚乙烯材料混合不利于单独回收再利用,若放一起回收再生产则限制了应用场合。
因此,有必要研究改进现有的冷冻食品包装膜,以解决上述问题。
发明内容
本发明的第一个目的在于提供一种单一材料复合可回收冷冻食品包装膜。
本发明的第二个目的在于提供一种上述单一材料复合可回收冷冻食品包装膜的制备方法。
为达到上述发明的目的,本发明的技术方案如下:
本发明的第一个方面提供了一种单一材料复合可回收冷冻食品包装膜,从上至下依次包括表层和热封层,所述表层和热封层通过胶黏剂复合在一起;其中,所述表层为经过电子交联处理的BOPE膜,厚度为20-50um;所述热封层为普通PE膜,厚度为40-80um;所述胶黏剂为无溶剂聚氨酯胶黏剂,含量低于包装膜原料总含量的1%。
本发明的第二个方面提供了一种上述单一材料复合可回收冷冻食品包装膜的制备方法,包括如下步骤:
S1、表层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到表层PE膜半成品,然后进行双向拉伸处理得到BOPE膜,再对BOPE膜进行电子交联处理,即得到表层PE膜;其中,挤出机的模头温度为220℃;双向拉伸处理的参数设置:纵向拉伸预热温度60~70℃,纵向拉伸温度100~105℃,纵向拉伸比3.5~4.2,横向拉伸预热温度85~95℃,纵向拉伸温度100~105℃,横向拉伸比3.0~4.0;电子交联处理的参数设置:线速度60m/min,K值2.3,淬火层数5,束流30mA,电压0.2Mv;
S2、热封层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到热封层PE膜,其中,挤出机的模头温度为220℃;
S3、上胶复合
在步骤S2制得的热封层PE膜的内侧均匀涂覆一层无溶剂聚氨酯胶黏剂,将S1步骤制得的表层PE膜的内侧与热封层PE膜相对后在无溶剂复合机上进行复合,经熟化得到所述包装膜。
进一步地,所述无溶剂聚氨酯胶黏剂的上胶量1-2g/m2。
进一步地,所述复合机的参数设置为:复合温度50-70℃,复合压力为0.2-0.4MPa。
进一步地,所述熟化的温度为45-55℃,保持时间为48h。
本发明跟现有技术相比,其优势和有益效果在于:
1、采用单一的PE膜制作表层和热封层,且其中胶黏剂的含量可忽略不计,因此,回收时可直接回收而无需分离处理,从而简化了回收工序,降低了回收成本;
2、表层PE膜通过双向拉伸处理后再进行电子交联处理,在提高包装膜耐刺穿性能、耐高温性能的同时,提高了其粘合度,使之在使用过程中不易撕裂;
3、本发明的冷冻食品包装膜制备方法简单、耐刺穿性能强、不易损坏、易于回收再利用,可广泛推广应用于食品包装领域。
具体实施方式
本发明的一种单一材料复合可回收冷冻食品包装膜,从上至下依次包括表层和热封层,所述表层和热封层通过胶黏剂复合在一起;其中,所述表层为经过电子交联处理的BOPE膜,厚度为20-50um;所述热封层为普通PE膜,厚度为40-80um;所述胶黏剂为无溶剂聚氨酯胶黏剂,含量低于包装膜原料总含量的1%。
上述单一材料复合可回收冷冻食品包装膜的制备方法,包括如下步骤:
S1、表层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到表层PE膜半成品,然后进行双向拉伸处理得到BOPE膜,再对BOPE膜进行电子交联处理,即得到表层PE膜;其中,挤出机的模头温度为220℃;双向拉伸处理的参数设置:纵向拉伸预热温度60~70℃,纵向拉伸温度100~105℃,纵向拉伸比3.5~4.2,横向拉伸预热温度85~95℃,纵向拉伸温度100~105℃,横向拉伸比3.0~4.0;电子交联处理的参数设置:线速度60m/min,K值2.3,淬火层数5,束流30mA,电压0.2Mv;
S2、热封层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到热封层PE膜,其中,挤出机的模头温度为220℃;
S3、上胶复合
在步骤S2制得的热封层PE膜的内侧均匀涂覆一层无溶剂聚氨酯胶黏剂,将S1步骤制得的表层PE膜的内侧与热封层PE膜相对后在无溶剂复合机上进行复合,经熟化得到所述包装膜。
进一步地,所述无溶剂聚氨酯胶黏剂的上胶量1-2g/m2。
进一步地,所述复合机的参数设置为:复合温度50-70℃,复合压力为0.2-0.4MPa。
进一步地,所述熟化的温度为45-55℃,保持时间为48h。
以下结合具体实施例,对本发明做进一步说明。
实施例1
一种单一材料复合可回收冷冻食品包装膜的制备方法,包括如下步骤:
S1、表层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到表层PE膜半成品,然后进行双向拉伸处理得到BOPE膜,再对BOPE膜进行电子交联处理,即得到厚度为20um表层PE膜;其中,挤出机的模头温度为220℃;双向拉伸处理的参数设置:纵向拉伸预热温度60℃,纵向拉伸温度100℃,纵向拉伸比3.5,横向拉伸预热温度85℃,纵向拉伸温度100℃,横向拉伸比3.0;电子交联处理的参数设置:线速度60m/min,K值2.3,淬火层数5,束流30mA,电压0.2Mv;
S2、热封层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到热封层PE膜,其中,挤出机的模头温度为220℃;
S3、上胶复合
在步骤S2制得的热封层PE膜的内侧均匀涂覆一层无溶剂聚氨酯胶黏剂,将S1步骤制得的表层PE膜的内侧与热封层PE膜相对后在无溶剂复合机上进行复合,经熟化得到所述包装膜。
其中,所述无溶剂聚氨酯胶黏剂的上胶量1g/m2;所述复合机的参数设置为:复合温度50℃,复合压力为0.2MPa;所述熟化的温度为45℃,保持时间为48h。
以下结合具体实施例,对本发明做进一步说明。
实施例2
相较于实施例1的区别仅在于:表层PE膜的厚度均为35μm,热封层PE膜的厚度为60μm,纵向拉伸预热温度65℃,纵向拉伸温度102℃,纵向拉伸比4,横向拉伸预热温度90℃,纵向拉伸温度102℃,横向拉伸比3.5,上胶量为1.5g/m2,复合温度60℃,复合压力为0.3MPa,熟化的温度为50℃,其余均同实施例1。
实施例3
相较于实施例1的区别仅在于:表层PE膜的厚度均为50μm,热封层PE膜的厚度为80μm,纵向拉伸预热温度70℃,纵向拉伸温度105℃,纵向拉伸比4.2,横向拉伸预热温度95℃、纵向拉伸温度105℃,横向拉伸比4.0,上胶量为2g/m2,复合温度70℃,复合压力为0.4MPa,熟化的温度为55℃,其余均同实施例1。
对比例1
相较于实施例1的区别仅在于:所述步骤S1中的PE膜为普通的PE膜,未经过双向拉伸处理和电子交联处理,其余均同实施例1。
对比例2
相较于实施例1的区别仅在于:所述S1中的表层PE膜为BOPE膜,其余均同实施例1。
对比例3
相较于实施例1的区别仅在于:所述S2中的热封层PE膜为电子交联PE膜,其余均同实施例1。
实施例1-3和对比例1-3的性能测试
对实施例1-3和对比例1-3所制得的包装膜进行拉伸强度、抗刺穿强度、耐热性能测试,:
(1)拉伸强度
测试依据:GBT 13022-1991《塑料薄膜拉伸性能试验方法》;
测试条件:速度500mm/min;
(2)抗刺穿强度
测试依据:GBT 21302-2007《包装用复合膜、袋通则》;
测试条件:1mm直径针头,速度50mm/min;
(3)热封曲线测试
测试依据:QB/T 2358《塑料包装的热封强度测试方法》;
测试条件:RFY-03热封仪,热封时间1s,热封压力0.2Mpa,在不同温度下,检测起封温度。
实施例1-3和对比例1-3的性能测试数据如表1所示:
表1
拉伸强度(MPaN/15mm) | 抗穿刺强度(N) | 起封温度(℃) | |
实施例1 | 22 | 10 | 140 |
实施例2 | 27 | 12 | 150 |
实施例3 | 30 | 13 | 155 |
对比例1 | 15 | 6 | 105 |
对比例2 | 16 | 8 | 120 |
对比例3 | 18 | 7 | 125 |
从表1可以看出,实施例1-3均具有较优异的拉伸强度、抗刺穿强度和耐温性能,且随着包装膜厚度的增加,拉伸强度、抗刺穿强度和耐温性能均有所提升,特别是当包装膜的厚度接近实施例3的厚度时,其拉伸强度、抗刺穿强度和耐温性能处于最优状态;此外,通过比较实施例1和对比例1-3的各项性能数据可知,未经过双向拉伸和电子交联处理的PE膜所制成的包装膜,其拉伸强度、抗刺穿强度和耐温性能均较差。
本发明相较于现有技术的最大区别点在于:本发明的表层和热封层均采用单一的PE膜,分别通过双向拉伸与电子交联处理相结合的方式制备而成,大大提高了包装膜的机械强度和耐热性,同时,由于材料的单一性,胶黏剂含量很少可忽略不计,因此,本发明的包装膜在回收时可直接回收而无需分离处理,从而简化了回收工序,降低了回收成本。
以上已对本发明创造的较佳实施例进行了具体说明,但本发明创造并不仅限于所述的的实施例,熟悉本领域的技术人员在不违背本发明创造精神的前提下还可以作出种种的等同的变型或替换,这些等同变型或替换均包含在本申请权利要求所限定的范围内。
Claims (5)
1.一种单一材料复合可回收冷冻食品包装膜,其特征在于,从上至下依次包括表层和热封层,所述表层和热封层通过胶黏剂复合在一起;其中,所述表层为经电子交联处理的BOP E膜,厚度为20-50um;所述热封层为普通PE膜,厚度为40-80um;所述胶黏剂为无溶剂聚氨酯胶黏剂,含量低于包装膜原料总含量的1%。
2.上述权利要求1所述的一种单一材料复合可回收冷冻食品包装膜的制备方法,其特征在于,包括如下步骤:
S1、表层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到表层PE膜半成品,然后进行双向拉伸处理得到BOPE膜,再对BOPE膜进行电子交联处理,即得到表层PE膜;其中,挤出机的模头温度为220℃;双向拉伸处理的参数设置:纵向拉伸预热温度60~70℃,纵向拉伸温度100~105℃,纵向拉伸比3.5~4.2,横向拉伸预热温度85~95℃,纵向拉伸温度100~105℃,横向拉伸比3.0~4.0;电子交联处理的参数设置:线速度60m/min,K值2.3,淬火层数5,束流30mA,电压0.2Mv;
S2、热封层PE膜的制备
将PE母粒放入对应的挤出机料斗中,经模头熔融塑化共挤得到热封层PE膜,其中,挤出机的模头温度为220℃;
S3、上胶复合
在步骤S2制得的热封层PE膜的内侧均匀涂覆一层无溶剂聚氨酯胶黏剂,将S1步骤制得的表层PE膜的内侧与热封层PE膜相对后在无溶剂复合机上进行复合,经熟化得到所述包装膜。
3.根据权利要求2所述的一种单一材料复合可回收冷冻食品包装膜的制备方法,其特征在于,所述步骤S3中的无溶剂聚氨酯胶黏剂的上胶量1-2g/m2。
4.根据权利要求2所述的一种单一材料复合可回收冷冻食品包装膜的制备方法,其特征在于,所述步骤S3中的复合机的参数设置为:复合温度50-70℃,复合压力为0.2-0.4MPa。
5.根据权利要求2所述的一种单一材料复合可回收冷冻食品包装膜的制备方法,其特征在于,所述步骤S3中的熟化温度为45-55℃,保持时间为48h。
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