Company: SUZ
Filing Date: 2025-04-28
Form Type: 20-F
Source: 0001628280-25-020368
Chunk: 90

Company: Suzano S.A.
Filing Date: 2025-04-28
Form: 20-F
Item: Item 4
Chunk 90
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99.0% of the chemicals used in the kraft cooking process are recovered and reused within a closed-loop chemical recovery system, with only minimal makeup chemicals needed to compensate for losses.

Bleaching. To produce bleached pulp, the unbleached pulp is submitted to a chemical bleaching process. The bleaching process promotes further selective delignification and increases brightness of the fibers. This process consists of a series of medium-consistency bleaching stages in towers. In each bleaching tower a different mixture of bleaching agents is applied and after each stage, the pulp is washed. Three or four bleaching stages are required to obtain a fully bleached pulp. Our modern and low environmental impact bleaching processes are either elemental chlorine free (ECF) or total chlorine free (TCF). The bleaching process is designed to be harmless and may incorporate chlorine dioxide, sulfuric acid, caustic soda and hydrogen peroxide, without the use of elemental chlorine. At the end of the bleaching stages, the diluted bleached pulp, in its fluid state, is pumped to storage towers. Thereafter, the bleached pulp may be transferred directly to integrated operations in our own paper production or tissue paper facilities. We produce paper in the Mucuri, Suzano and Limeira mills and also supply slushed pulp to integrated paper producing customers in Jacareí (Ahlstrom) and Três Lagoas (Sylvamo Corporation). Our tissue paper production takes place in the Mucuri and Imperatriz mills. The majority of bleached pulp is, however, sold as raw material after being dried in high-capacity drying machines and converted into bales. In the Suzano mill, we are also producing dried pulp in rolls for fluff applications.

Paper and Tissue Paper Manufacturing

We produce (i) uncoated woodfree printing and writing paper at our Mucuri unit, Limeira unit, Suzano unit and Rio Verde unit; (ii) coated woodfree printing and writing paper at our Suzano unit and Limeira unit; (iii) paperboard at our Suzano unit and at our recently acquired Pine Bluff unit, in the US, and (iv) tissue papers at Mucuri, Maracanau, Cachoeiro do Itapemirim, Imperatriz, Mogi das Cruzes and Belém. We start the paper production process by sending the pulp to refiners, which increases the fibers’ resistance. The pulp slurry is then fed into the paper mill