Best Car Rental Industry TPU Invisible Car Film Extrusion Line Factory & Exporters

Aliphatic TPU features a linear carbon structure that does not absorb ultraviolet wavelengths. Aromatic TPU, by contrast, contains benzene rings that degrade and yellow when exposed to sunlight. For car rental companies that need long wrap life cycles (typically 3 to 5 years), aliphatic TPU ensures the film remains optically clear and does not leave hard adhesive residues behind upon removal.

Our T-dies feature high-precision expansion bolts controlled by heating cartridges. These are linked to an online beta-ray or X-ray thickness measurement gauge. If a section of film is detected to be too thick or thin, the controller adjusts the heating current on the respective bolt. The resulting thermal expansion alters the die lip gap locally, maintaining film thickness variation within a precise ±1.5% tolerance.

TPU is highly hygroscopic and absorbs moisture from the atmosphere quickly. If you extrude wet resin, the high heat inside the barrel causes hydrolysis, breaking the polymer chains. This results in visual defect bubbles, reduced tensile strength, and lower impact resistance. Gwell includes desiccant dryers that reduce resin moisture to less than 0.02% before extrusion.

Depending on film thickness (typically 150μm to 200μm for paint protection films), our lines achieve stable mechanical run speeds between 15 to 30 meters per minute. A standard line delivers a net production output of 250 to 450 kilograms per hour, optimizing utility and resin consumption rates.

We use high-purity, optical-grade stainless steel casting rolls that undergo multi-stage super-mirror polishing. The rolls are paired with cleanroom enclosures surrounding the casting and winding zones to prevent dust settling. In addition, our multi-channel screw and barrel designs prevent polymer gels and degradation points.