Extract the cellulose fibers, there are two possible options: 1. Grinding the wood (into what is known as mechanical pulp, used in only 30% of the world's paper production processes). 2. Apply a chemical treatment to the wood chips (in what is known as chemical pulp), through an alkaline product such as caustic soda or sulfate, or through sulfite.
In the second option, if an alkaline product is used, the effluents generated are highly polluting, and in both cases there are often chemicals that cannot be recovered buy email database and are released together with the residual effluents from the process. Once the cellulose fibers have been extracted, there are remains of lignin that give the pulp its color.
In order for the pulp obtained to be white, it must be subjected to a bleaching process, which can be carried out following different techniques (using products such as ozone or hydrogen peroxide, or other much less sustainable ones such as the use of chlorine dioxide or of chlorine gas). Finally, different kinds of moist pulp are mixed.