首页 > 文献 > 方便面纸杯杯体阻氧性的监测方案——压差法气体渗透仪

方便面纸杯杯体阻氧性的监测方案——压差法气体渗透仪

2017年4月13日 发表评论 阅读评论

摘要:方便面作为油炸类面食,其对外包装的阻隔性要求较高,以防面饼氧化变质。本文利用Labthink兰光VAC-V1压差法渗透仪测试方便面纸杯杯体材料对外界氧气的阻隔性能,并详述了试验过程及试验原理、设备参数等内容,以便企业在验证包装氧气阻隔性能时可加以参考。

关键词:方便面、纸杯、杯体、氧化、酸败、哈喇味、氧气透过率、阻氧性、阻隔性、气体渗透仪

1、现状

方便面主要成分是小麦面粉、棕榈油、调味酱和脱水蔬菜叶等,都是补充人体营养所必需的成分。早期方便面采用塑料复合膜或铝塑复合                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        膜包装,随着时代发展和大众需求的变化,方便面的包装开始多样化,日益兴起的纸杯包装便于消费者在旅途中随时冲泡食用方便面。

阻氧性是指包装材料对外界氧气的阻隔作用,是影响产品货架期的重要因素,通过检测可分析解决产品由于外界氧气产生的氧化变质等问题。本文通过介绍方便面纸杯杯体包装材料阻氧性的检测方法,阐述包装阻氧性能对产品的影响。如果纸杯阻氧性较差,方便面产品在出厂之后的流通环节和货架期时会出现因包装氧气透过率过大,造成内容物出现酸败、哈喇味、发霉等质量问题,因此食品企业应加强对纸杯包装阻氧性的定期检测。

图1  方便面纸杯包装

2、检测标准

国内有关复合膜及片材包装的氧气透过率测试方法有压差法、库仑计法(等压法),参考的方法标准分别为GB/T 1038-2000 《塑料薄膜和薄片气体透过性试验方法压差法》与GB/T 19789-2005 《包装材料塑料薄膜和薄片氧化透过性试验库仑计检测法》。本文参考标准为GB/T 1038-2000。

3、试验样品

某食品厂提供的方便面纸杯。

4、试验设备

济南兰光机电技术有限公司自主研发设计的VAC-V1压差法气体渗透仪。

图2  VAC-V1压差法气体渗透仪

4.1 测试原理

VAC-V1采用压差法测试原理,将预先处理好的试样放置在上下测试腔之间,夹紧。首先对低压腔(下腔)进行真空处理,然后对整个系统抽真空;当达到规定的真空度后,关闭测试下腔,向高压腔(上腔)充入一定压力的试验气体,并保证在试样两侧形成一个恒定的压差(可调);这样气体会在压差梯度的作用下,由高压侧向低压侧渗透,通过对低压侧内压强的监测处理,从而得出所测试样的各项阻隔性参数。

4.2 适用范围

(1) 本设备适用于塑料片材、薄膜、纸张、纸板及其复合材料、化妆品软管片材、各种橡胶片材等包装气体透过率测试。

薄膜类:各种塑料薄膜、塑料复合薄膜、纸塑复合膜、共挤膜、镀铝膜、铝箔、铝箔复合膜等膜状材料的气体渗透性能测试。

片材类:各种工程塑料、橡胶、建材等片状材料的气体渗透性能测试,如PP片材、PVC片材、PVDC片材等。

(2) 本设备适合于多种气体的透过率测试,如氧气、二氧化碳、氮气、空气、氦气等以及各种薄膜对易燃易爆气体的阻隔性能测试。

(3) 本设备可满足多项国家和国际标准,如ISO 15105-1、ISO 2556、GB/T 1038、ASTM D1434、JIS K7126-1、YBB 00082003。

4.3 设备参数

测试范围:0.1 ~ 100,000 cm3/(m2·24h·0.1MPa)。

试样数量: 1件。

试验温度范围:室温 ~ 50℃,控温精度 ±0.1℃。

测试量程可根据需要进行扩展,满足大透过率测试的要求。

支持有毒气体及易燃易爆气体的测试(需改制)。

可进行任意温度下的数据拟合,轻松获得极端条件下的试验结果。

支持LystemTM实验室数据共享系统,统一管理试验结果和试验报告。

5、试验过程

(1) 用取样器从纸杯杯体表面裁取尺寸Φ65 mm样品3片。

(2) 取出其中1片,将试样用胶封合在测试腔上。

(3) 设置试样名称、试样厚度、试验温度等参数。

(4) 启动真空泵。

(5) 点击“开始试验”选项,试验开始,仪器自动计算并显示试验结果。

(6) 将另外2片试样分别按照(2) ~ (5)的步骤进行测试。

6、试验结果

测试的方便面纸杯杯体的氧气透过率为:1207.0238 cm3/(m2·24h·0.1MPa)、1039.1156 cm3/(m2·24h·0.1MPa)、1067.0872 cm3/(m2·24h·0.1MPa)。

7、结论

VAC-V1压差法气体渗透仪是一款专业用于测试薄膜和片材氧气透过率的仪器,设备操作简单、测试精度高、重复性好,可准确反映包装的阻氧性。除了需监控氧气透过率,还应加强对纸杯包装整体的阻湿性能、化学卫生性能等重点项目检测。Labthink兰光作为包装检测设备研发与制造业的翘楚,为全球客户提供专业、高端的包装检测设备和检测服务。了解其相关的检测设备,您可登陆www.labthink.com查看。济南兰光机电技术有限公司愿借此与行业中的企事业单位增进技术交流与合作。

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