How much do you know about Top Former Suction System?
The top former is a part of the PM wire part. It is installed between the under-pressure and suction boxes, approximately in the second third of the wire table. Its most important part is a three-chamber suction box with different under-pressure values in particular chambers. Through separators, this suction box is connected to the vacuum system.
l Drain the water from the top surface of the sheet
l Improve the sheet formation and the 2-sidesness
l Improve the print quality
l Improve the bulk of the sheet
l Improve the drainage
The most important part of the top former is its suction box with diverse vacuum capacity and gradually increasing under-pressure values. Under the second suction box chamber and under the bottom wire there is a forming box installed with height-adjustable and pneu matically controlled bars in order to improve the formation of the paper on the wire. Behind the forming chamber, there is a suction box keeping the paper web on the bottom wire in the place of the division of the top and bottom wire.
On the bearing structure, type cantilever, there are driving roll, guide roll with positioning, wire run regulator, wire stretching device, spraying showers, and wire cleaning system installed. All the rolls are provided by doctors. Under the bottom wire, on the bearing struc ture, there are white water trays with discharge branches installed and used for splashing. The top former itself is completed also with service bridges. It is used particularly in new and reconstructed PM wire sections with operating speeds up to 1600 m/min.
LEIZHAN WORKING CASES：
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