Batch Gravimetric Doser，Loss-in-Weight Feeder，Blown film extrusion

Batch Gravimetric Doser（欧洲塑料辅机行业叫法，对应GIW增重批次配料机）

重点：Doser = 配料/定量装置，欧洲厂商（Moretto、Piovan、Brabender）更喜欢用 Batch Gravimetric Doser / Gravimetric Batch Dosing Unit；美国市场习惯叫 Gravimetric Batch Blender，两者指同一种增重式批次称重混料设备（Gain-in-Weight GIW）

1. Overseas Definition（国外定义）

Batch Gravimetric Doser is a gain-in-weight (GIW) multi-component gravimetric dosing & mixing unit for plastics processing. It works in discrete batch cycles, not continuous flow. Multiple raw materials are dosed sequentially into one shared weighing hopper fitted with load cells. The controller measures the weight gain of each ingredient one by one. Once all components reach recipe target weights, materials are blended inside the chamber and discharged as one complete batch to extruder / blown film line / injection machine.

中文释义：批次称重配料机是增重式（GIW）多组份称重配料混合设备，属于间歇批次循环，不是连续流量。多种原料依次投放到同一套称重传感器的共用秤斗，控制器逐个测量每种物料的增重；全部组分达到配方设定重量后，在仓内混合，整批一次性卸料送入挤出机、吹膜线或注塑机。

❗ 行业区分（老外很看重这点）

• Batch Gravimetric Doser / Gravimetric Batch Blender → GIW 增重批次，单秤斗，依次加料，间歇出料
• Loss-in-Weight Feeder / Continuous Gravimetric Doser → LIW失重式，多独立秤，连续流量喂料

2. Working Principle（国外样本标准原理描述）

1. The weighing hopper is tared to zero at the start of each cycle. 每批次开始，秤斗归零去皮。
2. Each ingredient hopper opens pneumatic gate in sequence, material drops into the common weighing chamber. 各原料料仓气动闸阀按顺序开启，物料落入共用称重仓。
3. Load cell monitors real-time weight gain. Fast feed first, then dribble slow feed for precision; gate closes once target weight is achieved. 称重传感器实时监测增重，先快下料，临近目标值转为慢速滴料提升精度；达到设定重量，料门关闭，切换下一组分。
4. After all ingredients are dosed, the batch is mixed in blending chamber. 全部配料完成，物料在搅拌仓混合。
5. Full batch discharge to process machine, then hopper empties and tare for next cycle. 整批卸料至主机，料斗排空归零，开启下一批循环。

3. Key Benefits（海外官网常用卖点，中英一行对一行）

✅ Gravimetric dosing, independent of bulk density variation 重量法计量，不受物料堆积密度波动影响 ✅ Single load cell design, lower investment cost vs multi loss-in-weight feeders 单传感器设计，对比多台失重喂料机采购成本更低 ✅ Multi recipe storage, easy grade / color changeover 多配方存储，换规格、换色快速切换 ✅ Stainless steel material contact parts, easy disassembly & cleaning 物料接触不锈钢，可拆卸，清料换色便捷 ✅ Compact design, can be mounted directly above extruder throat (blown film / injection) 结构紧凑，可直接吊装在吹膜、注塑主机料斗上方 ✅ Batch-to-batch consistency, stabilizes film colour and gauge for blown film 批次间配比稳定，用于吹膜时稳定薄膜色差与膜厚

4. Typical Applications（海外应用场景）

• Blown film extrusion（吹膜生产线，4组分*常用：新料、回料、色母、功能母粒）
• Injection molding（注塑）
• Pipe & profile extrusion（管材、型材挤出）
• Sheet / thermoforming（片材、热成型）
• PET preform, recycling compounding（PET瓶坯、回收改性）

5. Limitations（选型说明，国外技术文档标配）

It is batch-intermittent operation, not continuous mass flow. Good accuracy for medium & high percentage ingredients; relative error increases for very low additive ratios (<0.5%). Optimized for plastic pellets; not ideal for poor-flow fine powders.

中文：间歇批次工作，无法提供连续恒定流量；中大比例组分精度**；极低添加比例（＜0.5%）相对误差变大；主打塑料颗粒，流动性差的超细粉体不适合。

6. 

1. Full title：4-Component Batch Gravimetric Doser for Blown Film (Gain-in-Weight Type)
2. Short title：Batch Gravimetric Doser / Gravimetric Batch Dosing Unit
3. Short paragraph for product brochure

   Batch Gravimetric Doser (GIW) sequentially weighs virgin resin, regrind, color masterbatch and additives into one weighing hopper. After completing all dosing, the batch is mixed and discharged to extruder. It ensures consistent blend ratio batch after batch for blown film and injection molding.