WorksheetsMulti or 3 Layer Forming paperboard
Total questions: 10
Worksheet time: 5mins
Multi forming section is designed for manufacturing multiply boards principle, kecuali:
bonds together the web plies delivered by the different headboxes to the fourdriniers
forming one uniform web
forming multi uniform web
The different plies are joined by using an open transfer roll to press the web to be bonded against another web.
The forming section consists of Fourdrinier 1 and Fourdriniers 2 and 3 and a OptiFormer Hybrid top former unit, kecuali:
•The drives of Fourdrinier 1 (print ply) are on the couch and turning rolls.
•The print ply of the board is formed on Fourdrinier 1, the filler ply on Fourdrinier 2 and the OptiFormer Hybrid top former unit , and the back ply on Fourdrinier 3.
•The OptiFormer Hybrid top former unit drive is not located on the turning roll.
•The drives of Fourdriniers 2 and 3 (filler and back ply) are on the turning rolls.
The fourdrinier dewatering elements are, kecuali:
specified for each forming section separately on the basis of converting
productionvthe basis of production
the properties of the furnish used
the dewatering elements is selected such that it will produce a dryness level best suited for bonding the different plies at the bonding point.
Board ply formation is affected by, kecuali:
Adjustment on the fourdriniers takes place by adjusting the furnish
adjusting the drainage
the drainage split on the fourdriniers.
element blade angles, number and vacuum.
To ensure press section runnability, kecuali:
•the dewatering elements in the web travel direction.
the suction boxes and couch roll not include i run
Dewatering continues on the suction boxes and couch roll after bonding of the plies
Dewatering continues on the suction boxes and couch roll after bonding of the plies
The number and vacuum levels considered by, kecuali:
former drive power consumption as well as fabric life.
the flat suction boxes are optimized for each operator
the flat suction boxes are optimized for each board grade by observing the maximum final dryness,
the flat suction boxes are optimized for each board grade by observing the maximum final dryness, furnish properties
Multi forming section jobs were, kecuali:
The web plies delivered by the press
• stock coming from the headbox is couched on the forming section and roughly 98 % of the water is removed.
The fourdriniers remove water from the web downward and at the top former unit dewatering occurs upward.
Water is drained from the stock suspension with the help of various dewatering elements.
form a single web after multi forming happened, kecuali:
The web plies delivered by the headboxes to the fourdriniers are bonded together to form a single web
The different plies are bonded by using an open transfer roll to press one ply against another ply.
•After the bonding point, web travel along the bottom fourdrinier is ensured by a transfer suction box under the fabric.
The web plies delivered by the stock preparation
dewatering in forming mechanisme, kecuali:
The first dewatering element on the fourdriniers is the forming board.
After the forming board, water is removed by means of foil boxes, vacufoil boxes and high-vacuum foil boxes as well as flat suction boxes and transfer suction boxes.
At the top former unit water is removed by the to top press
•After bonding of the plies, the bottom fourdrinier removes water by means of the two-chamber flat suction boxes and the couch roll.
Effect of Stock Properties on Dewatering, kecuali:
stock from broke paperboard
filtration resistance (SR number, CSF),
consistency, fines content
temperature, air content, and pH
