The preheated raw paper enters the core part of the single facer -- the corrugating roll group. The corrugating roll set consists of two upper and lower rolls, with precise corrugated tooth patterns engraved on the surface. As the paper passes between the meshing corrugating rolls, it is pressed and formed into a uniform corrugated flute structure. The combination of pressure, temperature, and precise flute geometry shapes the paper into the required corrugated profile.
During the forming process, proper control of roll temperature, pressure, and alignment is essential. These factors directly affect the flute formation, bonding quality, and overall strength of the corrugated board, ensuring stable production and consistent cardboard quality.