PET瓶胚专用干燥机工作原理

PET瓶胚专用干燥机工作原理，PET结晶机，PET干燥机四、设备核心工作原理

1. 密闭上料：常温无定形 PET 切片经真空上料机从原料仓输送至预结晶模块，通过锁气旋转阀密闭进入结晶器，料位传感器实时控制料层厚度，防止受热不均。
   Airtight feeding: Normal temperature amorphous PET chips are conveyed from the raw material silo to the pre-crystallization module by a vacuum feeder, and enter the crystallizer hermetically through an air lock rotary valve. The level sensor controls the material layer thickness in real time to prevent uneven heating.
2. 分级预结晶：过滤后的环境空气经加热至 140~160℃，从结晶器底部布风板均匀送入，与流化的切片充分接触，完成常温→预热→结晶的分级加热，结晶度提升至 25%~35%，定型防粘连，同时脱附表面游离水。
   Graded pre-crystallization: Filtered ambient air is heated to 140~160℃, uniformly sent from the air distribution plate at the bottom of the crystallizer, and fully contacted with fluidized chips to complete graded heating from room temperature to preheating to crystallization, the crystallinity is increased to 25%~35% to shape and prevent adhesion, and at the same time desorb surface free water.
3. 密闭送料至干燥模块：结晶达标后的切片经锁气阀排出，通过保温密闭输送机送至干燥料斗，全程无外露、零接触环境空气，输送温度稳定在 140℃左右，杜绝二次吸湿。
   Airtight feeding to drying module: Chips with qualified crystallization are discharged through an air lock valve and sent to the drying hopper through a thermal insulation airtight conveyor, with no exposure and zero contact with ambient air throughout the process, and the conveying temperature is stable at about 140℃ to eliminate secondary moisture absorption.
4. 高温低露点深度干燥：环境空气经分子筛除湿机降至 - 40℃~-70℃低露点，再加热至 160~180℃形成高温低露点热风，从干燥料斗底部向上吹送，与切片逆流接触 4~6 小时，将含水率降至≤20ppm。
   High temperature and low dew point deep drying: Ambient air is reduced to a low dew point of -40℃~-70℃ by a molecular sieve dehumidifier, then heated to 160~180℃ to form high-temperature and low-dew-point hot air, which is blown upward from the bottom of the drying hopper and contacts the chips in countercurrent for 4~6 hours to reduce the moisture content to ≤20ppm.
5. 热风再生循环：吸附饱和的分子筛由 180~250℃再生热风脱附水汽，双塔分子筛自动交替切换、转轮分子筛连续旋转，保证干燥热风无间断供应，再生废风余热回收预热进气，实现节能运行。
   Hot air regeneration cycle: The water vapor of the saturated molecular sieve is desorbed by 180~250℃ regeneration hot air. The double-tower molecular sieve switches automatically and alternately, and the rotary molecular sieve rotates continuously to ensure the uninterrupted supply of dry hot air. The waste heat of regenerated waste air is recovered to preheat the intake air for energy-saving operation.
6. 注塑联动供料：干燥达标后的切片经保温真空上料机送至注塑机恒温料斗，料位传感器与干燥机联动，根据注塑产能自动调节供料速度，保证料位稳定，切片输送温度≥150℃，匹配注塑机高速熔融需求。
   Injection linked feeding: Dried qualified chips are sent to the constant temperature hopper of the injection moulding machine by a thermal insulation vacuum feeder. The level sensor is linked with the dryer to automatically adjust the feeding speed according to the injection capacity to ensure stable level. The chip conveying temperature is ≥150℃, matching the high-speed melting demand of the injection moulding machine.