Top Dewatering Former

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. 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 with doctors. Under the bottom wire, on the bearing structure, 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 1.500 resp. 1.600 m/min. Dryness on the bottom wire is 10-12%.

Design

The most important part of the top former is its suction box with diverse vacuum capacity and gradually increasing under- pressure values.

Under the suction box of top former and under the bottom wire there is a forming box installed with height-adjustable and pneu-matically controlled bars in order to improve 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 division of the top and bottom wire.

Main parts
  • Supporting structure – cantilever design (1)
  • Guide rolls (2)
  • Wire stretching units (3)
  • Wire run regulator (4)
  • Suction box – top former (5)
  • Forming box – bottom wire (6)
  • Oscillating system (7)
  • Suction box for wire cleaning (8)
  • Doctors
  • Suction box – bottom wire (9)
  • Sensing of wire stroke
  • Collecting tanks (10)
  • Covering and walkways
Accessories
  • Under-pressure system
  • Drive
  • Control system with control panel
  • Dewatering wire
  • System for vapours suction
  • Fixtures for rolls and wire replacement

Construction design and machine safety are in compliance with EU and EAC standards.

Technical Parameters
Max. Paper widthmm7500
Max. Working speedm/min1500
Max. Production rangeg/m235 - 200 *)
Dewatering (% flow rate from headbox)%30 - 60 *)

* according to the grade of produced paper

Advantages
  • High dewatering efficiency
  • Placement saving
  • Improved paper symmetry
  • Improved web strength characteristics and limited or even eliminated porosity
  • Improved formation of fibres in paper sheets
  • Enhanced possibility for checking of dewatering capacity
  • Category

    Paper Machine
  • Section

    IndustrialPaper/CulturalPaper/SpecialtyPaper




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