The forming roll is a cylindrical component, typically covered with
a mesh or porous surface. It is part of the paper machine’s forming
section, where it works in conjunction with other equipment to
shape and drain the pulp slurry into a cohesive paper sheet. The
roll is usually made of materials that can withstand the mechanical
and moisture conditions present in the papermaking process.
Function:
1. Sheet Formation:
- The forming roll helps in shaping the wet paper web as the pulp
slurry is distributed onto it. The roll’s surface assists in
forming and consolidating the fibers into a continuous sheet.
2. Water Drainage:
- As the paper sheet moves over the forming roll, water drains
through the mesh or porous surface. This drainage is crucial for
removing excess moisture and allowing the fibers to bond together,
forming a solid and uniform paper sheet.
3. Fiber Distribution:
- The design and texture of the forming roll’s surface can
influence the evenness of fiber distribution in the paper web.
Proper fiber distribution is essential for achieving consistent
paper quality.
4. Support and Transfer:
- The forming roll supports the paper web during the early stages
of its formation and transfers it to the next section of the paper
machine. It helps maintain the integrity of the sheet as it
transitions through various stages of the papermaking process.
5. Control of Sheet Formation:
- By adjusting the roll’s surface characteristics and rotational
speed, operators can control aspects such as the thickness and
density of the paper sheet. This customization helps in producing
paper with specific properties tailored to various applications.
Summary:
The forming roll is integral to the papermaking process,
contributing to the effective formation, drainage, and support of
the paper sheet
