热处理过程对PLA薄膜阻隔性能的影响

发布时间：2018-01-23 06:52

本文关键词： 热处理 PLA阻隔性氧气透过量吸水量水分透过量　出处：《包装工程》2017年19期 　论文类型：期刊论文

【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80~124g·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。
[Abstract]:Objective to study the effects of different heat treatments on the barrier properties of PLA films. Methods the food simulants packaged with PLA and PE films were treated with different heat treatments. The oxygen transmittance and water absorption capacity of PLA and PE films after heat treatment were analyzed. Results the oxygen transmittance of PLA and PE films before heat treatment was 3737.27 and 1469.54 cm3/(m2 路d 路Pa, respectively. Due to defects in PLA and PE films after heat treatment, the moisture transmittance of PLA films was not measured in the gas permeability tester. The moisture transmittance of the films was between 80 ~ 124g 路cm/(cm2 路s 路Pa). The moisture transmittance of PE film is between 4.9 ~ 29.6 g 路cm/(cm2 路s 路Pa. When cooking and heating, the tensile strength and moisture permeability of PE film are obtained when the storage time is 3 weeks. Conclusion the traditional cooking and heating disinfection has the greatest influence on the barrier performance of PLA, which is not suitable for food packaging materials that need cooking and disinfection. The effect of disinfection on the properties of packaging materials should not be ignored.
【作者单位】：义乌工商职业技术学院;
【分类号】：TB484
【正文快照】： 聚乳酸(PLA)主要以玉米等可再生资源为原料,来源广泛,具有很好的生物降解性、生物相容性和生物可吸收性,且兼具聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)等塑料的优点,是最有发展前途的绿色包装材料,可广泛应用于食品包装、医药包装等领域[1—2]。其中聚乳酸薄膜对西兰花、杨桃、

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