In the fields of new energy materials, electronic packaging, and composite film manufacturing, hot melt coating technology is gradually replacing traditional solvent-based coating processes. As the core equipment of this technology, extrusion-type hot melt coating systems have undergone multiple technological innovations, effectively addressing the pain points of traditional equipment, such as low coating accuracy, high material waste, and poor adaptability. These advancements provide reliable support for the efficient production of novel polymer adhesive films like POE/EVA.

1. Breakthrough Improvements in Tension Control Systems

Modern extrusion-type hot melt coating equipment adopts a fully closed-loop tension control system, enabling independent and precise regulation of unwinding, coating, and rewinding processes. Through the coordinated operation of servo motors and tension sensors, the system monitors substrate movement in real time, controlling tension fluctuations within ±0.5N. This segmented control mode not only eliminates substrate wrinkling and uneven adhesive thickness caused by tension imbalances in traditional systems but also significantly enhances adaptability to diverse substrates. Whether handling 25μm PET films or 1.2mm fiberglass fabrics, the equipment achieves smooth transitions through preconfigured parameters.

2. Structural Optimization of Extrusion Systems

To address the industry challenge of hot melt adhesive residue and difficult cleaning, new-generation equipment features modular screw designs. For single-screw systems, increasing the shear groove depth in the mixing section (from 0.8mm to 1.5mm) improves POE material melting efficiency by 30%. Dual-screw systems utilize an asymmetric meshing structure, reducing residue by 82% compared to conventional models. This design shortens cleaning time during material switching to 45 minutes and reduces the minimum trial material usage to one-third of traditional equipment, substantially lowering R&D costs.

3. Advancements in Precision Metering Technology

Coating systems equipped with high-precision gear metering pumps achieve flow control accuracy of ±0.25%. Specially designed involute tooth profiles and nitriding processes stabilize gear pair clearances within 5μm at 280°C. Integrated with PID temperature control modules, the system confines adhesive viscosity fluctuations to ±3%, ensuring coating uniformity with a CV value ≤1.8%. Tests show that at a line speed of 2m/min, coating thickness deviation remains stable at ±2μm, fully meeting the production requirements for high-end products like photovoltaic backsheets.

4. Upgraded Multifunctional Coating Die Compatibility

The slot-die coating head incorporates multi-zone temperature control technology, enabling lip gap adjustments with 0.01mm precision. By rapidly replacing lip components, the same equipment can accommodate various coating methods, including knife-over-roll and micro-gravure. A uniquely designed flow channel guide plate reduces adhesive residence time in the die cavity by 40%, effectively preventing thermal degradation. Combined with online thickness gauges and closed-loop feedback systems, coating weight control accuracy reaches ±0.8g/m².

As novel composite materials continue to emerge, modern extrusion-type hot melt coating equipment is evolving toward intelligent and flexible production. Through innovations in core components, these systems not only improve production yields but also enable seamless scaling from lab-scale trials to industrial mass production. Driven by carbon neutrality policies, their low-energy-consumption and zero-emission characteristics will support the development of green manufacturing systems, providing critical technological foundations for strategic industries such as new energy and electronics.