如何选择适合的PET Desiccant Drying分子筛除湿干燥机？

 如何选择适合的PET Desiccant Drying分子筛除湿干燥机？分子筛干燥机，节能干燥机

# How to Select Suitable PET Desiccant Drying Machine ## 中英双语完整版选型指南 ## English ### 1. Calculate actual hourly PET consumption (Basic data) First calculate material consumption per hour based on injection molding machine parameters: Hourly consumption (kg/h) = (3600 ÷ molding cycle) × cavity number × single preform weight(g) ÷ 1000 Add 15%~20% safety margin for peak production. ### 2. Match drying hopper capacity PET standard drying time: 4~6 hours. Hopper effective capacity = hourly consumption × drying time × 1.2 safety factor. Choose double-layer 304 stainless steel insulated hopper; adopt low-speed stirring structure for PET slices & rPET flakes to prevent caking under high temperature. ### 3. Confirm required dew point grade (core standard) | Product Type | Required Dew Point | Target Moisture Content | Machine Matching | | ---- | ---- | ---- | ---- | | Ordinary mineral water preform | -40℃ | ≤80ppm | Twin tower molecular sieve, economical model | | Edible oil bottle, hot-fill preform | -45~-50℃ | ≤50ppm | High-performance 3A molecular sieve, mainstream choice | | Food & medical grade transparent preform | -50~-55℃ | ≤35ppm | Imported molecular sieve + full closed-loop air duct | High humidity workshop (South China rainy season RH＞75%) shall not adopt dew point higher than -45℃. ### 4. Match drying air volume Standard airflow for PET: 2.2~3.0 m³/h per kg raw material. Total air volume = hourly consumption × 2.5 + 15% pipeline loss allowance. Ensure hot air evenly penetrates material layer to avoid uneven drying. ### 5. Choose molecular sieve & machine structure - Adsorbent: Select **3A molecular sieve**, only absorb water molecules, avoid adsorbing nitrogen/air to maintain stable dew point; reject 4A molecular sieve. - Structure type: Twin-tower alternating adsorption & regeneration, realize 24h non-stop supply of dry air. - Energy-saving option: Equip waste heat recovery device to cut power consumption by 20%~30%. - Material: All air ducts and hoppers contact with PET adopt SUS304 stainless steel, fully insulated to stop re-moisture. ### 6. Distinguish virgin PET & recycled rPET matching scheme 1. Virgin PET slices: Standard twin tower desiccant dryer + agitating hopper, dew point -40~-45℃, drying 4h. 2. Recycled rPET flakes: Upgrade to high dew point (-50℃), longer drying time 6~8h, match pre-crystallizer to remove surface glue and impurity moisture. ### 7. Auxiliary function & after-sales consideration - Recommended functions: Online dew point monitoring, PLC formula storage, interlock with central feeding system. - Brand selection: Large mass production line chooses imported brands (Piovan, Moretto); medium & small bottle preform factories select domestic first-line or local manufacturers with fast after-sales service. - Avoid under-sized machine: Small airflow & insufficient hopper capacity cause incomplete drying, resulting in bubbles, haze and brittleness of preforms. --- ## 中文对照 如何选型适配的PET分子筛除湿干燥机 ### 1. 核算每小时PET实际耗料量（选型基础） 根据注塑机腔数、成型周期、单只瓶胚重量计算小时用料： 小时耗料(kg/h)=(3600÷成型周期秒数)×腔数×单胚克重÷1000 额外增加15%~20%余量，应对生产峰值。 ### 2. 匹配干燥料斗有效容量 PET标准烘干时长4～6小时； 料斗有效容量=小时耗料×干燥时长×1.2**系数； 必须选用双层304不锈钢保温料桶；加工切片、回收瓶片需搭配低速搅拌结构，防止高温物料结块架桥。 ### 3. 确定露点等级（核心选型指标） | 产品类型 | 要求露点 | 原料含水率标准 | 机型配置建议 | | ---- | ---- | ---- | ---- | | 普通矿泉水瓶胚 | -40℃ | ≤80ppm | 经济型双塔分子筛 | | 食用油瓶、热灌装瓶胚 | -45~-50℃ | ≤50ppm | 高性能3A分子筛（行业主流） | | 食品、医药级高透瓶胚 | -50~-55℃ | ≤35ppm | 进口分子筛+全闭环保温风道 | 华南梅雨季车间湿度＞75%，低选型露点不低于-45℃。 ### 4. 匹配干燥风量 PET行业标准：每公斤原料需2.2~3.0m³/h干燥风； 总风量=小时耗料×2.5 + 15%管路损耗余量； 保证热风均匀穿透料层，避免局部干燥不足、干湿不均。 ### 5. 分子筛类型与主机结构选择 - 吸附介质：优先**3A分子筛**，只吸附水分子，不吸附氮气空气，露点长期稳定；不推荐4A分子筛。 - 主机结构：双塔交替吸附再生，可24小时不间断输出低露点干风。 - 节能升级：选配余热回收模块，整体节电20%~30%。 - 材质标准：接触原料风道、料斗全部304不锈钢，全程保温，杜，绝烘干后原料二次返潮。 ### 6. 全新PET切片与回收rPET瓶片区分选型 1. 全新PET切片：标准双塔除湿主机+搅拌料斗，露点-40~-45℃，烘干4小时； 2. 回收rPET瓶片：升级-50℃深度露点，烘干延长至6~8小时，配套预结晶机去除表面胶渍与杂质水分。 ### 7. 附加功能与售后考量 - 实用配置：在线露点实时监测、PLC多配方存储、可联动中央供料系统； - 品牌分级：大型规模化产线选；中小型瓶胚厂选国产一线或本地设备厂，售后上门响应更快； - 避坑提醒：不可一味选小机型，风量不足、料斗容量偏小会导致干燥不彻底，成品出现气泡、发白、脆裂大量不（良）。