PVDF Extrusion Casting Machine with Machine Direction Orientation
I.Introduction
PVDF Extrusion Casting Machine with MDO mainly consists of 1 small precision single-screw extruder, 1 screen changer, 1 melt pump, 1 casting die, 1 small precision casting unit, 1 single-point MDO unit, and 1 haul-off & winding unit. It can realize online extrusion, casting, stretching, edge trimming, and winding in one continuous process.
II. Material Application
PVDF (Polyvinylidene Fluoride) is an excellent polymer material. Its film products are widely used in photovoltaic backsheets, industrial wastewater treatment, and other fields due to outstanding mechanical strength and chemical stability (pH 2–12).
Key Process Parameters Material:
PVDF pellets Die width: 500 mm
Effective width: 300–400 mm (with both-side trimming)
Film thickness: 10–50 μm
III.Experimental Results and Performance Improvement
Film Structure and Crystal Phase Control
By precisely controlling the stretching temperature and ratio, the equipment effectively promotes the transformation of PVDF from the α-phase to the β-phase. Meanwhile, blended modifiers (such as GO/metal nanoparticles) are uniformly dispersed in the film, resulting in a denser film structure and controllable pore channels. This significantly improves permeability and corrosion resistance, providing a reliable foundation for the R&D of homogeneously blended PVDF ultrafiltration membranes, PVDF/PTFE composite membranes, and similar products.
Mechanical and Separation Performance
After blending modification, the anti-fouling performance of the film is greatly enhanced. Its water flux and rejection rate meet the application requirements for reclaimed water reuse and special separation scenarios, effectively expanding the application scope of PVDF membranes.
POTOP PVDF Extrusion Casting Machine with MDO achieves stable, high-ratio, high-precision, and high-uniformity machine-direction stretching. It enables precise control of the crystal structure and overall performance of PVDF films, making it ideal for the development of blended modified PVDF membranes and special separation membranes. It is the preferred equipment for university laboratories and advanced material companies engaged in PVDF membrane research.
