Difference of effects of environmental humidifier and spray-chilling on weight-loss of pig carcasses in cooling process
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摘要: 本研究对比了雾化增湿与雾化喷淋两种方式对猪胴体预冷干耗的影响。采用超声雾化加湿器来增加预冷环境湿度方式以及气液两相流间歇雾化喷淋的方式分别对猪胴体样品进行预冷处理,以直接冷却猪胴体样品为对照组。实验结果表明:雾化增湿组样品最终平均干耗为1.442%,经14 h雾化喷淋处理的各样品继续冷却至24 h后测得最终平均干耗为1.066%,对照组实验样品最终平均干耗为2.914%。雾化喷淋冷却处理与雾化增湿冷却处理均可使猪胴体冷却速度加快(p<0.05)。雾化喷淋冷却处理与雾化增湿冷却处理均可有效缩短样品干耗达到峰值的时间(p<0.05),其达到峰值时间关系为:雾化喷淋组<雾化增湿组<对照组。雾化喷淋冷却处理与雾化增湿冷却处理均可显著降低猪胴体预冷干耗(p<0.05);雾化喷淋冷却处理比雾化增湿冷却处理降低干耗效果更为理想(p<0.05)。Abstract: In this study,effects of cooling process on the weight-loss of pig carcasses under environmental humidifier condition and spray-chilling condition were compared. Cooling process of pig carcasses were conducted under the environmental humidifier condition by ultrasonic atomization humidifier increasing environment humidity and under spray-chilling condition by gas-liquid two-phase flow intermittently spraying,and experiment sample without humidification and spray treatment was regarded as control group.The experiment results indicated that the final average weight-loss of samples under environmental humidifier condition( humidity 100%) was 1.442%,and the final average weight-loss of samples under spray-chilling condition for 14 h and then cooling to 24 h was 1.066%,and the final average weight-loss of samples for control group was2.914%. Spray-chilling and environmental humidifier cooling treatment can increase the cooling velocity of pig carcass( p <0.05). The spray-chilling treatment and environmental humidifier treatment can reduce effectively the weight-loss peak time( p < 0.05).Relationship of the weight loss peak time for three groups is spray-chilling < environmental humidifier < control group. Spray-chilling and environmental humidifier cooling treatment can reduce the weight-loss of pig carcasses in cooling process( p < 0.05) significantly.Reducing weight-loss effect for spray-chilling is better than that for environmental humidifier( p < 0.05).
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Keywords:
- pig carcass /
- weight-loss /
- environmental humidifier /
- spray-chilling
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