周刚.热处理过程对PLA薄膜阻隔性能的影响[J].包装工程,2017,38(19):87-91.
ZHOU Gang.Impact of Heat Treatment on the Barrier Properties of PLA Film[J].Packaging Engineering,2017,38(19):87-91. |
| 热处理过程对PLA薄膜阻隔性能的影响 |
| Impact of Heat Treatment on the Barrier Properties of PLA Film |
| 投稿时间：2017-02-22 修订日期：2017-10-10 |
| DOI： |
| 中文关键词: 热处理 PLA阻隔性 氧气透过量 吸水量 水分透过量 |
| 英文关键词: heat treatment barrier property of PLA oxygen permeation water absorption moisture permeability |
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| 中文摘要: |
| 目的 研究不同热处理对PLA薄膜阻隔性能的影响。方法 对用PLA和PE薄膜包装好的食品模拟物进行不同的热处理，分析热处理后PLA和PE薄膜氧气透过量、吸水能力、水分透过量的变化。结果 热处理前的PLA和PE薄膜的氧气透过量分别为3737.27和1469.54 cm3/(m2•d•Pa)，热处理后因PLA和PE薄膜出现缺陷，在透气性测试仪中测量不出数据。PLA薄膜的水分透过量在80~124 g•cm/(cm2•s•Pa)之间，PE薄膜的水分透过量在4.9~29.6 g•cm/(cm2•s•Pa)之间。在蒸煮加热时，当储存时间为3周时，PLA的拉伸强度、透湿量、吸水率都会减小。结论 传统的蒸煮加热消毒对PLA的阻隔性能影响最大，不适用于需要蒸煮消毒的食品包装材料。在预测食品货架期时，不应忽视消毒方式对包装材料性能产生的影响。 |
| 英文摘要: |
| The work aims to study the impact of different heat treatment on the barrier property of PLA films. The food stimulants wrapped with PLA and PE films were under heat treatment. The change in oxygen permeation, water absorption capacity and moisture permeability of PLA and PE films after heat treatment were analyzed. The oxygen permeation of PLA and PE films without heat treatment was 3737.27 and 1469.54 cm3/(m2•d•Pa), respectively. No data could be detected by the air permeability tester due to the defects occurring in PLA and PE films after heat treatment. The moisture permeability of PLA film was 80~124 g•cm/(cm2•s•Pa), and the moisture permeability of PE film was 4.9~29.6 g•cm/(cm2•s•Pa). During steaming and heating, if the storage time was three weeks, the tensile strength, moisture permeability and water absorption rate of PLA would decrease. The traditional steaming and heating for disinfection has the greatest effect on the barrier property of PLA. Such operation is not applicable to the food packaging materials to be steamed for disinfection. For the prediction of food’s shelf life, the impact of the disinfection way on the properties of packaging materials should not be neglected. |
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