To Make Groundwood Pulp...
The bark is removed from the logs.
Then, the cut logs are forced by hydraulic or steam pressure against a revolving grinding stone in the presence of water.
This treatment converts the wood into a pulp consisting of minute particles of both fibrous and nonfibrous portions of wood.
The nonfibrous materials deteriorate when left for some time in contact with air.
Therefore, paper made from this kind of pulp lacks permanency.