Industrial Process

In this stage, the objective is to dissolve any lignin present between the wood fibers. These fibers are the actual cellulose pulp.

The wood chips are submitted to chemical action with white liquor (sodium hydroxide plus sodium sulfide) and steam in the contnuous digester (pressure vessel) with controlled temperature, pressure and retention time.

After cooking, the pulp undergoes the first wash in the continuous digester and is then discharged into a discharge tank (blow tank), where it is stored for transfer to the next stage in the process.