Product Introduction

Wet‑process lithium‑ion battery separator casting pilot line is designed for UHMWPE powder‑white oil‑additive wet‑process separator systems. As an integrated full‑process unit, it integrates dual reactors for slurry preparation, precision twin‑screw extrusion, melt pump pressure‑stabilized conveying, coat‑hanger T‑die casting, three‑roll casting & shaping, ultrasonic dichloromethane extraction and hot‑air drying. It is suitable for separator formula screening, process parameter optimization and small‑batch sample preparation.

The core process route of wet‑process separator:

High‑temperature melt‑blending of ultra‑high‑molecular‑weight polyethylene (UHMWPE) with white oil (mineral oil) in proportion → melt compounding via twin‑screw extrusion → casting through coat‑hanger T‑die onto casting rolls for cooling and forming → white oil extraction by dichloromethane → hot‑air drying → subsequent stretching for pore formation.

Product Performance

● Full‑process integration: Completes the whole front‑end workflow of wet‑process separators on one single line, from slurry preparation and extrusion casting to extraction and drying.

● Freely combinable modular screw: More than six types of screw elements can be arranged as required. Only screw configuration needs adjusting for formula change. One equipment supports process development for UHMWPE of various molecular weights, diverse white‑oil contents and different additive systems.

● Alternate dual‑reactor feeding + melt‑pump pressure stabilization: Two 50L reactors enable continuous material supply. The 1.8 kW servo‑driven melt pump delivers stabilized output to eliminate screw pulsation and ensure uniform casting‑sheet thickness.

● Three‑roll independent servo casting: Three Φ300 mm super‑mirror casting rolls are individually driven by 1.8 kW servo motors. Adjustable line‑speed difference between rolls allows research on effects of different draw ratios upon film crystallization and orientation. Combined cooling‑heating temperature controllers provide precise temperature control from 5 °C to 160 °C.

● Constant‑tension winding + automatic edge trimming & winding: 0.75 kW servo motor realizes constant‑tension main winding; 0.4 kW independent motor collects edge trimmings for neat and wrinkle‑free rolls.

● Ultrasonic extraction & explosion‑proof drying: Dual‑chamber duplex‑stainless‑steel extraction tank equipped with ultrasonic units accelerates extraction; 12 fixing frames support batch processing. The drying oven adopts explosion‑proof exhaust fans for safe removal of residual dichloromethane.

● Automatic measurement & control: A 10‑inch touch screen centrally manages the whole system with real‑time display of temperature‑pressure curves and automatic fault alarm & shutdown. PLC plus host computer realizes adaptive linkage of multiple process parameters.

● Easy‑to‑clean & low‑maintenance design: Dead‑zone‑free bottom ball valves and quick‑discharge three‑way valves for reactors; quick‑open replaceable feeding screws; non‑stop hydraulic screen changer. All designs cater to frequent material change‑over and repeated cleaning typical for pilot‑scale equipment.

Application Fields

● Lithium‑ion battery separator manufacturers: New‑product R&D centers and pilot‑scale lines

● Power / energy‑storage battery manufacturers: Separator material evaluation and supplier comparison tests

● Polymer‑material research institutes: Research projects on UHMWPE processing and polyolefin microporous membranes

● New‑energy‑material enterprises: Separator formula development, white‑oil‑system optimization and additive screening

● Material testing & certification institutions: Standard sample‑making platform for separator materials