Automotive headliners

The headliner (internal roof lining) is the vehicle's roof finishing part, typically a composite structure composed of rigid substrate (traditionally fiberglass or reinforced cardboard, modernly semi-rigid PU foam or combination with polyolefins), flexible PU foam layer for soft touch and acoustic absorption, and knit fabric or synthetic leather as finishing. PU represents the critical component at two points: as three-dimensionally molded semi-rigid structural substrate (roofs with contours, courtesy light housing, sunroof structures, curtain airbag structures), and as backing for the finishing fabric for adhesion and feel. It increasingly integrates features — ambient lighting systems, sensors, integrated antennas, panoramic sunroof, airbags. Contributes significantly to cabin acoustic and thermal performance.