射频处理对花椒粉品质及EVOH/PA包装薄膜性能的影响

Effect of Radio Frequency on the Quality of Pepper Powder and the Properties of EVOH/PA Films

为了避免二次污染,在实际生产中产品多以预包装形式进行射频处理,研究射频处理对内装物及外部包装材料的影响尤为重要。本文以花椒粉为原料,EVOH/PA薄膜为外部包装材料,采用6 kW,27.12 MHz的射频设备进行杀菌,研究射频过程中影响其升温速率的关键因素。结果表明:在25~40 mm的射频极板间距下,随着极板间距的升高,电场强度变小,射频输出功率降低,包装件的升温速率下降。在相同的极板间距条件下,随着花椒粉含水率的升高,介电损耗因子增加,包装件的升温速率提高。还研究了射频处理不同温度的花椒粉的菌落总数及最佳杀菌温度下的颜色改变情况,结果表明,当射频处理温度80℃时,花椒粉基本无细菌检出,且此处理温度未对花椒粉色泽产生显著影响。射频处理未对EVOH/PA包装薄膜的力学性能和阻隔性能产生显著性影响,说明其可作为预包装花椒粉新型杀菌方式。

In order to avoid secondary pollution,in actual production,products are usually pre-packaged for RF treatment.Therefore,it is particularly important to study the influence of RF treatment on the inner and outer packaging materials.In this paper,pepper powder as Installation,EVOH/PA film as external packaging material,using 6 kW,27.12 MHz RF equipment for sterilization,the key factors affecting the heating rate in the RF process were studied.It was found that with the increase of electrode gap,the electric field strength and the RF output power decreases,so the heating rate of the packaging decreases.With the increase of the moisture content of the pepper powder the dielectric loss factor increases,so the heating rate of the packaging decreases.The total number of colonies at different temperature and the pepper powder's color with the optimal sterilization temperature were studied.The results showed that when the temperature of RF treatment reached 80℃,it had almost no bacteria detected.Moreover,this temperature had no significant effect on its color.The effects of RF treatment on the external packaging materials were studied.The results showed that the mechanical and barrier properties of EVOH/PA packaging films were not significantly affected by RF treatment.Therefore,RF treatment can be used as a new and effective sterilization method of pre-packaged pepper powder.