PET瓶胚專用干燥機工作原理，PET結晶機，PET干燥機四、設備核心工作原理

1. 密閉上料：常溫無定形 PET 切片經(jīng)真空上料機從原料倉輸送至預結晶模塊，通過鎖氣旋轉閥密閉進入結晶器，料位傳感器實時控制料層厚度，防止受熱不均。
   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. 分級預結晶：過濾后的環(huán)境空氣經(jīng)加熱至 140~160℃，從結晶器底部布風板均勻送入，與流化的切片充分接觸，完成常溫→預熱→結晶的分級加熱，結晶度提升至 25%~35%，定型防粘連，同時脫附表面游離水。
   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. 密閉送料至干燥模塊：結晶達標后的切片經(jīng)鎖氣閥排出，通過保溫密閉輸送機送至干燥料斗，全程無外露、零接觸環(huán)境空氣，輸送溫度穩(wěn)定在 140℃左右，杜絕二次吸濕。
   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. 高溫低露點深度干燥：環(huán)境空氣經(jīng)分子篩除濕機降至 - 40℃~-70℃低露點，再加熱至 160~180℃形成高溫低露點熱風，從干燥料斗底部向上吹送，與切片逆流接觸 4~6 小時，將含水率降至≤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. 熱風再生循環(huán)：吸附飽和的分子篩由 180~250℃再生熱風脫附水汽，雙塔分子篩自動交替切換、轉輪分子篩連續(xù)旋轉，保證干燥熱風無間斷供應，再生廢風余熱回收預熱進氣，實現(xiàn)節(jié)能運行。
   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. 注塑聯(lián)動供料：干燥達標后的切片經(jīng)保溫真空上料機送至注塑機恒溫料斗，料位傳感器與干燥機聯(lián)動，根據(jù)注塑產(chǎn)能自動調節(jié)供料速度，保證料位穩(wěn)定，切片輸送溫度≥150℃，匹配注塑機高速熔融需求。
   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.