针芽形绿茶连续化生产线设计与工艺参数优化

摘要

根据针芽形名优绿茶品质特点及加工特性,集成运用设施摊青装备、电磁内热滚筒杀青机、多级连续理条机、搓叶机、远红外提香机等新型节能高效设备,组建一条实用性强、高效节能、品质优异的针芽形名优绿茶连续化生产线;并对生产线中摊青、杀青、理条、烘焙等关键工序的作业参数进行研究,提出整套针芽形绿茶连续化生产工艺技术.经研究后,得到了最佳工艺参数:摊青温度18~25℃,相对湿度60%~90%;杀青投叶量125 kg·h-1,温度270℃,时长65 s;多级连续理条为240℃(38 Hz),210℃(40 Hz),180℃(45 Hz);滚筒干燥温度40~55℃;烘焙温度100℃,投叶量30 kg·h-1.%According to the quality and processing characteristics of needle-type premium green tea, a strongly practicable, energy-efficient and highly qualified needle-type premium green tea continuous production line which consisted of the fresh tea leaves artificial spreading machine, electromagnetic heat roller fixation machine, multiphase continuous fixation-shaping machine, rubbing machine, far-infrared raising fragrant machine and other energy efficient facilities was organized. The processing procedures of the continuous production line including spreading, fixation, fixation-shaping and baking were investigated and a complete set of processing technology about the line on needle-typepremium green tea was proposed. The results showed that the best process parameters were: temperature at 18-25℃ and humidity at 60%-90% for fresh tea leaves spreading, the leaf weight of 125 kg·h-1, baking temperature at 270℃ and time of 65 second for the fixing, 240℃(38 Hz), 210℃(40 Hz) and 180℃(45 Hz) for the multiphase continuous fixation-shaping, and drying temperature at 40-55℃, baking temperature at 100℃, speed of 30 kg·h-1 for the rotary continuous drying.