Doctor blades are an indispensable component of all rolls in a paper machine, from the wire section to the take-up section. Their main functions include: keeping the roll surface clean, maintaining roll surface roughness, preventing paper tangling, and improving paper quality. The correct selection and application of doctor blades are crucial to paper performance, the stability of the paper machine’s operation, and the lifespan of the rolls.

The hardness of the doctor blade edge should be lower than or match the surface hardness of the roll surface. Using an overly hard doctor blade will severely scratch the expensive roll surface coating or overmolding in a short period of time, resulting in repair or replacement costs of tens or even hundreds of thousands of yuan.

The requirements for doctor blades vary significantly between different stations on a paper machine. The wire section primarily requires the removal of free water and avoidance of damage to the expensive forming wire or roll surface. The press section primarily requires paper feeding (peeling the wet paper web) and cleanliness, while protecting the granite or polyurethane roll surface. The drying section primarily requires the removal of dry pulp, adhesives, and coating residues, high temperature resistance (typically exceeding 90°C), and timely paper feeding guidance. The calender and winding section primarily require maintaining cleanliness under high temperature and pressure, and facilitating neat winding of the paper web.

With years of industry experience, Leizhan can help global paper mill customers precisely match doctor blade solutions, extend roll life, and reduce paper consumption per ton. Contact us to provide customized doctor blade solutions and paper mill machinery. Email: paperrecyclemachine@gmail.com