This double facer (a key corrugator component) features auto-rectifying canvas with bladder cylinder-controlled tightness, self-weight-adjusted upper rollers, and heating plates with 3-point-lock design plus 4-group independent steam supply for seasonal temperature tuning; thin base paper/3-layer boards trigger press roller cold-part lifting to preserve corrugation, 4-ply production uses internal nozzles to boost speed and bonding, the 150H steel frame ensures long-term stability, and optional vacuum suction enables mark-free boards for consistent long-hour operation and reliable firm board output.