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首页> 外文期刊>Packaging Technology and Science >Effect of biaxial-simultaneous stretching conditions on OTR and CO_2 permeation of CO_2 laser perforated poly(lactic acid) film
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Effect of biaxial-simultaneous stretching conditions on OTR and CO_2 permeation of CO_2 laser perforated poly(lactic acid) film

机译：双轴同时拉伸条件对CO_2激光打孔聚乳酸薄膜OTR和CO_2渗透的影响

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The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser with the power of 60W. The focal spot diameter was fixed at 103m. Pulse durations were varied from 1 to 30s, which corresponds to the fluence from 1.4 to 42.6J/cm(2). The perforated microhole size increased with increasing laser energy. The shape of microholes was circular for the films of equi-biaxial stretching, whereas elliptical microholes were formed with its long and short axes corresponding to the directions of higher and lower stretch ratios, respectively. Comparing the laser perforation behavior of the as-drawn films and annealed films, the opening of a microhole in the annealed films started at higher laser fluence, and at the same fluence the size of microhole was smaller. Gas transmission rates of the biaxially oriented poly(lactic acid) films with different thicknesses were examined. The oxygen transmission rates (OTR) of film improved with increased microhole diameter. The OTR of films containing 1 microhole/103cm(2) (hole diameter of 110m) was 184, 150, and 98cm(3)/d in comparison with the OTR for the original films without microhole of only 16, 10, and 8cm(3)/d, respectively. Packaging films with OTR higher than 100cm(3)/d (equivalent to the 9700cm(3)/m(2)/d) are required to create a modified atmosphere inside the package of fresh produce for shelf-life extension. Measured OTR and CO2TR values of the 3 different shapes of microhole were compared and discussed.
机译：通过同时双轴拉伸制备的双轴取向聚乳酸薄膜由功率为60W的CO2激光打孔。焦点直径固定为103m。脉冲持续时间从1到30s不等，对应于从1.4到42.6J / cm（2）的注量。穿孔的微孔尺寸随着激光能量的增加而增加。对于等双轴拉伸的膜，微孔的形状是圆形的，而椭圆形的微孔的长轴和短轴分别对应于较高和较低拉伸比的方向。比较拉伸薄膜和退火薄膜的激光穿孔行为，退火薄膜中的微孔开口以较高的激光通量开始，而在相同的通量下，微孔的尺寸较小。研究了具有不同厚度的双轴取向聚乳酸薄膜的气体透过率。膜的透氧率（OTR）随着微孔直径的增加而提高。包含1个微孔/ 103cm（2）（孔径为110m）的膜的OTR为184、150和98cm（3）/ d，而没有微孔的原始膜的OTR只有16、10和8cm（ 3）/ d。需要使用OTR高于100cm（3）/ d（相当于9700cm（3）/ m（2）/ d）的包装膜，以在新鲜农产品的包装内创造一种改良的气氛，以延长保质期。比较并讨论了三种不同形状的微孔的OTR和CO2TR测量值。

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