Multi-Layered Paper or Paperboard

Multi layered paper or paper board machines manufactures board with multi layers so that the thickness or basis weight of the board is up to 700 gsm. This are normally used for book covers, asphalt paper or roofing paper base and a variety of thick boards for industrial and commercial use.This machines run so slow. The design or construction of multi-layered board machines is a combination of Fourdrinier and Former cylinders or just plainly made of 6- units of conventinal design Former Cylinders. Odf course the usual Press section and Drying part is integrated in the whole system.

Board Machines

This machines are used to manufacture paperboard -normally on the higher basis weight categories.
The basis weight ranges from 125 gsm up to 300 gsm and this types of paperboards are linerboard,corrugating medium, bristol boards, roofing paper, chip board and other packaging materials.
Board machines run at normally low speeds say up to 100 meters per minute due to its thickness.
Board machines consist of two parts, they are-Wet Part and Drying Part.The wet part is the forming section and the Drying part is the final stage. The froming section consists of the Forming Cylinders where it receives pulp stock from the Approach flow system. This pulp stock just rotates around the cylider for initial formation and drainage then it is fed towards the succeeding fromer cylinder and so on. Board Machines may operate with up to 5 Former cylinders before the paper web is fed to the Press Section.
Press operation, Drying, Calendering and Reeling operation then follows-almost typical as the ones in the Paper Machines.