PROCESS FOR THE PRODUCTION OF KRAFT PULP FROM HARDWOOD AND SOFTWOOD MIXTURES, KRAFT PULP OBTAINED BY THE PROCESS AND PAPER PRODUCTS PRODUCED FROM THE PULP

• Main Authors: DE PASCOAL NETO, Carlos, ANDREIA ALVES ALMEIDA, Catia, ISABEL GOMES SOARES, Belinda, CRISTINA DE OLIVEIRA RODRIGUES PINTO, Paula
• Format: Patent
• Language: English; French; German
• Published: 17.04.2024
• Subjects: APPARATUS THEREFOR; IMPREGNATING OR COATING OF PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS; PULP COMPOSITIONS; REGENERATION OF PULPING LIQUORS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

The present invention relates to a process for producing a pulp by the Kraft process, from mixtures of hardwood and softwood, in which the hardwood species predominates, using suitable impregnation, mild cooking conditions, typical of hardwood, and cooking interruption, followed by complementary separation of the fibers by mechanical means. The process includes steps of selecting a mixture of hardwood and softwood wood chips in a minimum proportion of 51% by weight of hardwood, impregnating the wood with a cooking liquor up to the cooking temperature, stopping the cooking when at least 30% of the lignin has been removed from the softwood wood, separating the cooking liquor from the resulting partially delignified wood and mechanically defibration of the resulting wood until a high yield cellulosic pulp is obtained. A further aspect of the present invention relates to paper products produced from the pulp obtained by the process of the invention.