Detrashing for Low and Medium Consistency Pulping

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With the use of contaminated secondary fibers, it is essential to remove the contaminants from the process as early as possible in order to prevent size reduction, to improve the stock preparation line runnability, productivity and to reduce maintenance costs.

Kadant detrashing systems apply to applications with low and medium consistency pulping in to remove as much as 95% of the total contaminants.

Kadant has two basic designs for detrashing:

The Cleaning Poire
The Hydrapurge/Select purge concept

These systems can be associated with other pieces of equipment, such as the junk trap and the trash well, in order to remove heavy destructive or large floatable contaminants, before they reach any rotating device.

Kadant also has a complete range of raggers and rag rope cutters.

Working Principle
Both the Hydrapurge and Cleaning Poire enable the stock to be screened at the pulping section in order to separate the contaminants at a very early stage before they reach any pump.

The cleaning Poire is a one stage concept, operating discontinuously, and introducing a washing cycle before rejecting the contaminants in order to reject virtually fibre free contaminants.

The Hydrapurge in connection with the Select purge rejects continuously contaminated stock. The Hydrapurge includes a strong defibering action allowing part of its output to be accepted and consequently increasing the pulping capacity. The Selectpurge is a special heavy duty trommel drum allowing the recovery of fibres and rejecting virtually fibre free contaminants.

Applications
All secondary fibre stock preparation lines

Benefits

Excellent contaminant removal
Excellent runnability
Reduced maintenance costs

Cleaning Poire

Very compact (one piece of equipment)
Economic
Ideal for small and medium capacity systems

Hydrapurge and Selectpurge

Besides the high decontamination capacity, the system acts as a parallel pulper, increasing the capacity of the line
Ideal for medium to large capacity systems
Flexible layout