CN113478933A - 一种交联pof防雾保鲜自收缩膜及其生产工艺 - Google Patents
一种交联pof防雾保鲜自收缩膜及其生产工艺 Download PDFInfo
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Abstract
本发明公开了一种交联POF防雾保鲜自收缩膜，包含A、B、C三层结构，A层和C层分别复合在B层的两侧；A层包含茂金属PE树脂75‑90份、自粘料5‑20份、开口剂1‑5份、抗氧化剂0.1‑1份；B层包含茂金属PE树脂90‑95份、防雾料5‑10份；C层包含茂金属PE树脂70‑80份、自粘料5‑20份、防雾料5‑10份、开口剂1‑5份、抗氧化剂0.1‑1份；本发明的交联POF防雾保鲜自收缩膜，通过配方原料的改进，使防雾保鲜膜的防雾性能优异、自粘性好、透明度高，并通过交联的方式使收缩率达到80%左右；所包装的产品可以提供适度的透氧性和透湿度，调节被保鲜品周围的氧气含量和水分含量，阻隔空气中的灰尘，从而延长食品的保鲜期；其生产工艺易于产品量产，并能保证产品质量。
Description
技术领域
本发明涉及一种交联POF防雾保鲜自收缩膜及其生产工艺。
背景技术
传统的防雾膜、保鲜膜系采用普通吹膜和流延方法生产，一般收缩率很低，很难达到10%以上，随着人们生活水平的日益提高，很多食材在超市冷藏、热保鲜食品保存、可视性化等有更新更高的要求，普通防雾膜、保鲜膜不能同时具备保鲜、防雾、高收缩三方面的性能要求，这就需要通过交联法生产POF收缩膜来满足。
发明内容
针对上述存在的技术问题，本发明的目的是：提出了一种防雾性能优异、自粘性好、透明度高、收缩率高的交联POF防雾保鲜自收缩膜及其生产工艺。
本发明的技术解决方案是这样实现的：一种交联POF防雾保鲜自收缩膜，包含A、B、C三层结构，A层和C层分别复合在B层的两侧；
所述A层包含如下组分：茂金属PE树脂75-90份、自粘料5-20份、开口剂1-5份、抗氧化剂0.1-1份；
所述B层包含如下组分：茂金属PE树脂90-95份、防雾料5-10份；
所述C层包含如下组分：茂金属PE树脂70-80份、自粘料5-20份、防雾料5-10份、开口剂1-5份、抗氧化剂0.1-1份。
优选的，所述茂金属PE树脂为C4、C6或C8结构的MLLD聚乙烯。
优选的，所述自粘料为PIB、EVA或C8茂金属中的至少一种。
优选的，所述开口剂为以PE为载体的含有开口助剂的母料，其中开口剂助剂为合成二氧化硅、球形二氧化硅、有机硅、硅酸盐类、云母片、硅藻土中的至少一种。
优选的，所述防雾料为以PE为载体的含有防雾助剂的母料，其中防雾助剂为表面活性剂甘油单油酸酯、山梨糖醇酐单硬脂酸酯、聚环氧乙烷(20)甘油单硬脂酸酯中的一种。
优选的，所述抗氧剂为抗氧剂1010和抗氧剂168的混合物，抗氧剂1010与抗氧剂168的质量配比为1:2。
一种交联POF防雾保鲜自收缩膜的生产工艺，包含以下步骤：
①将A层、B层和C层的原材料按配比分别在混合机内混合8-15min，分别得到A层混合料、B层混合料和C层混合料；
②用螺杆挤出机分别将A层混合料、B层混合料和C层混合料通过螺纹块剪切混炼后挤出，得到三层混合熔体，螺杆挤出机的温度设定为150-250℃；
③将三层混合熔体通过环形模具共挤形成熔体坯胎，并进行一次吹泡；
④将熔体坯胎水冷形成筒筒状片材，水冷温度为10-30℃；
⑤筒状片材经过牵引辊导向进入交联机，交联度达到60-80%后完成交联；
⑥对交联后的筒材进行二次吹泡拉伸成薄膜，预热温度在280-325℃，拉伸温度在140-170℃，定型温度在170-185℃；
⑦拉伸后的薄膜在30-70℃的环境下冷却后收卷；
⑧收卷后的薄膜存放在半成品时效架，环境温度为18-35℃，时效12-24小时；
⑨经时效后的薄膜按照客户要求规格分切、复卷，收卷硬度控制在88-93%；
⑩经分切、复卷后的薄膜按照成品检验标准检验并入库。
由于上述技术方案的运用，本发明与现有技术相比具有下列优点：
本发明的交联POF防雾保鲜自收缩膜，通过配方原料的改进，使防雾保鲜膜的防雾性能优异、自粘性好、透明度高，并通过交联的方式使收缩率达到80%左右；所包装的产品可以提供适度的透氧性和透湿度，调节被保鲜品周围的氧气含量和水分含量，阻隔空气中的灰尘，从而延长食品的保鲜期；其生产工艺易于产品量产，并能保证产品质量。
具体实施方式
下面结合实施例来说明本发明。
本发明所述的一种交联POF防雾保鲜自收缩膜，包含A、B、C三层结构，A层和C层分别复合在B层的两侧；
所述A层包含如下组分：茂金属PE树脂75-90份、自粘料5-20份、开口剂1-5份、抗氧化剂0.1-1份。
所述B层包含如下组分：茂金属PE树脂90-95份、防雾料5-10份。
所述C层包含如下组分：茂金属PE树脂70-80份、自粘料5-20份、防雾料5-10份、开口剂1-5份、抗氧化剂0.1-1份。
其中，所述茂金属PE树脂为C4、C6或C8结构的MLLD聚乙烯。
所述自粘料为PIB、EVA或C8茂金属中的至少一种。
所述开口剂为以PE为载体的含有开口助剂的母料，其中开口剂助剂为合成二氧化硅、球形二氧化硅、有机硅、硅酸盐类、云母片、硅藻土中的至少一种。
所述防雾料为以PE为载体的含有防雾助剂的母料，其中防雾助剂为表面活性剂甘油单油酸酯、山梨糖醇酐单硬脂酸酯、聚环氧乙烷(20)甘油单硬脂酸酯中的一种。
所述抗氧剂为抗氧剂1010和抗氧剂168的混合物，抗氧剂1010与抗氧剂168的质量配比为1:2。
实施例1-3的各层原料质量份数配比如下表所示：
上述实施例1-3的交联POF防雾保鲜自收缩膜均按照如工艺生产：
①将A层、B层和C层的原材料按配比分别在混合机内混合8-15min，分别得到A层混合料、B层混合料和C层混合料；
②用螺杆挤出机分别将A层混合料、B层混合料和C层混合料通过螺纹块剪切混炼后挤出，得到三层混合熔体，螺杆挤出机的温度设定为150-250℃；
③将三层混合熔体通过环形模具共挤形成熔体坯胎，并进行一次吹泡；
④将熔体坯胎水冷形成筒筒状片材，水冷温度为10-30℃；
⑤筒状片材经过牵引辊导向进入交联机，交联度达到60-80%后完成交联；
⑥对交联后的筒材进行二次吹泡拉伸成薄膜，预热温度在280-325℃，拉伸温度在140-170℃，定型温度在170-185℃；
⑦拉伸后的薄膜在30-70℃的环境下冷却后收卷；
⑧收卷后的薄膜存放在半成品时效架，环境温度为18-35℃，时效12-24小时，以保证定型收缩率及稳定其它性能；
⑨经时效后的薄膜按照客户要求规格分切、复卷，收卷硬度控制在88-93%；
⑩经分切、复卷后的薄膜按照成品检验标准检验并入库。
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施，并不能以此限制本发明的保护范围，凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围内。
Claims (7)
1.一种交联POF防雾保鲜自收缩膜，其特征在于：包含A、B、C三层结构，A层和C层分别复合在B层的两侧；
所述A层包含如下组分：茂金属PE树脂75-90份、自粘料5-20份、开口剂1-5份、抗氧化剂0.1-1份；
所述B层包含如下组分：茂金属PE树脂90-95份、防雾料5-10份；
所述C层包含如下组分：茂金属PE树脂70-80份、自粘料5-20份、防雾料5-10份、开口剂1-5份、抗氧化剂0.1-1份。
2.根据权利要求1所述的交联POF防雾保鲜自收缩膜，其特征在于：所述茂金属PE树脂为C4、C6或C8结构的MLLD聚乙烯。
3.根据权利要求1所述的交联POF防雾保鲜自收缩膜，其特征在于：所述自粘料为PIB、EVA或C8茂金属中的至少一种。
4.根据权利要求1所述的交联POF防雾保鲜自收缩膜，其特征在于：所述开口剂为以PE为载体的含有开口助剂的母料，其中开口剂助剂为合成二氧化硅、球形二氧化硅、有机硅、硅酸盐类、云母片、硅藻土中的至少一种。
5.根据权利要求1所述的交联POF防雾保鲜自收缩膜，其特征在于：所述防雾料为以PE为载体的含有防雾助剂的母料，其中防雾助剂为表面活性剂甘油单油酸酯、山梨糖醇酐单硬脂酸酯、聚环氧乙烷(20)甘油单硬脂酸酯中的一种。
6.根据权利要求1所述的交联POF防雾保鲜自收缩膜，其特征在于：所述抗氧剂为抗氧剂1010和抗氧剂168的混合物，抗氧剂1010与抗氧剂168的质量配比为1:2。
7.一种根据权利要求1所述的交联POF防雾保鲜自收缩膜的生产工艺，其特征在于，包含以下步骤：
①将A层、B层和C层的原材料按配比分别在混合机内混合8-15min，分别得到A层混合料、B层混合料和C层混合料；
②用螺杆挤出机分别将A层混合料、B层混合料和C层混合料通过螺纹块剪切混炼后挤出，得到三层混合熔体，螺杆挤出机的温度设定为150-250℃；
③将三层混合熔体通过环形模具共挤形成熔体坯胎，并进行一次吹泡；
④将熔体坯胎水冷形成筒筒状片材，水冷温度为10-30℃；
⑤筒状片材经过牵引辊导向进入交联机，交联度达到60-80%后完成交联；
⑥对交联后的筒材进行二次吹泡拉伸成薄膜，预热温度在280-325℃，拉伸温度在140-170℃，定型温度在170-185℃；
⑦拉伸后的薄膜在30-70℃的环境下冷却后收卷；
⑧收卷后的薄膜存放在半成品时效架，环境温度为18-35℃，时效12-24小时；
⑨经时效后的薄膜按照客户要求规格分切、复卷，收卷硬度控制在88-93%；
⑩经分切、复卷后的薄膜按照成品检验标准检验并入库。
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