Paper machine
Suspension at the headbox
After dilution and sorting in the constant part, the suspension of fibres, process materials and water has to be led to the wire part uniformly distributed across the width of the paper web. In principle, the speed at which the suspension exits from the headbox onto the wire has to be equal to the speed of the wire on which the sheet is formed. To achieve this, pressure is applied to the suspension in the headbox, in order to accelerate it to the wire speed. Apart from that, turbulence is generated just before the exit point of the headbox to avoid harmful flock formation.
The suspension leaves the headbox at the discharge lip. At this point, the suspension flowing onto the wire can have a thickness of up to 18 mm.
Paper machineSuspension at the headboxAfter dilution and sorting in the constant part, the suspension of fibres, process materials and water has to be led to the wire part uniformly distributed across the width of the paper web. In principle, the speed at which the suspension exits from the headbox onto the wire has to be equal to the speed of the wire on which the sheet is formed. To achieve this, pressure is applied to the suspension in the headbox, in order to accelerate it to the wire speed. Apart from that, turbulence is generated just before the exit point of the headbox to avoid harmful flock formation.The suspension leaves the headbox at the discharge lip. At this point, the suspension flowing onto the wire can have a thickness of up to 18 mm.
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