| 摘要: |
| 目的 比较分析不同种类包装材料的阻隔性及耐揉搓性，以研究材料在包装不同类型食品时的合 理性，并探讨压差法、等压法测试不同阻隔性材料的可比性及适用性。方法 采用压差法和等压法分别 测试食品包装常用材料 PET/Al/PA/CPP，PET/Al/CPP，PET/VMPET/CPP，PET/VMCPP，PET/PET- AlOx/CPP，PET-AlOx/PA/CPP，KPET/CPP，KOPP/CPP，PET/CPP，BOPP/CPP 样品的氧阻隔性，及其 经 270 次揉搓后的氧气透过量。结果 氧气阻隔性由高到低依次为 PET/Al/PA/CPP，PET/Al/CPP， PET/VMPET/CPP，PET-AlOx/PA/CPP，PET/PET-AlOx/CPP，PET/VMCPP，KOPP/CPP，KPET/CPP， PET/CPP，BOPP/CPP；与揉搓前样品的氧气透过量相比，KOPP/CPP，KPET/CPP，PET/CPP，BOPP/CPP 样品揉搓后氧气透过量增加量均低于 3%，其余 6 种样品揉搓后氧气透过量增加了至少 5 倍；除揉搓前 PET/Al/PA/CPP 样品外，其余样品的 2 种方法测试结果偏差均低于±10%。结论 在材质结构、镀层种类 及致密性，以及各层厚度、柔韧性等因素的影响下，10 种样品的阻隔性及耐揉搓性差异较大，适用于 包装不同类型的食品；同时，压差法测试高阻隔样品时结果偏高，等压法测试高透过量样品时结果偏低， 2 种方法均可用于除揉搓前 PET/Al/PA/CPP 样品外其余样品的测试。 |
| 关键词: 压差法 等压法 氧气透过量 揉搓 耐揉搓性 |
| DOI：10.19554/j.cnki.1001-3563.2019.07.011 |
| 分类号:TS206 |
| 基金项目:山东省材料化学安全检测技术重点实验室开放课题（2018SDCLHX006） |
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| Flex Resistance and Oxygen Permeability of Packaging Materials with Differential-pressure Method and Equal-pressure Method |
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YU Jia-jia1, CHEN Xin1, HE Xiang-ke2, GAO Cui-ling2
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1.Labthink Instruments Co., Ltd., Jinan 250031, China;2.Shandong Institute for Product Quality Inspection, Jinan 250102, China)
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| Abstract: |
| This research aims to compare permeability and flex resistance of different packaging materials, study the rationality of materials in different packaging for food and discuss the comparability and applicability of materials with different permeability through differential-pressure method and equal-pressure method. Oxygen permeability of samples including PET/Al/PA/CPP, PET/Al/CPP, PET/VMPET/CPP, PET/VMCPP, PET/PET-AlOx/CPP, KPET/CPP, PET- AlOx/PA/CPP, KOPP/CPP, PET/CPP, BOPP/CPP were tested with differential-pressure method and equal-pressure method before and after 270 cycles of flex test. The oxygen permeability rate of the samples before flex tests from high to low were PET/Al/PA/CPP＞PET/Al/CPP＞PET/VMPET/CPP＞PET-AlOx/PA/CPP＞PET/PET-AlOx/CPP＞PET/VMCPP＞ KOPP/CPP＞KPET/CPP＞PET/CPP＞BOPP/CPP. Compared with their oxygen permeability rate before flex tests, the oxygen permeability rate of KOPP/CPP, KPET/CPP, PET/CPP and BOPP/CPP after flex tests were increased by less than 3%, while for the other six samples, the oxygen permeability rate were increased by at least 5 times. The test results of all samples except PET/Al/PA/CPP obtained with both differential-pressure method and equal-pressure method were within the deviation of ±10%. Due to the differences in material structure, types of coatings, thickness and flexibility, the permeability and flex resistance of the ten samples are quite different, for which, they are suitable for different food packaging. In addition, though differential-pressure method gives a slightly higher result when testing high barrier materials; equal-pressure method gives a lower result when testing high permeability materials. Both methods are applicable to determine the oxygen permeability of all the samples except PET/Al/PA/CPP. |
| Key words: differential-pressure method equal-pressure method oxygen permeability flex test flex resistance |
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