CORRELATION BETWEEN CELLULOSIC PULP CHEMICAL CHARACTERISTICS AND PAPER OPTICAL AND PHYSICAL MECHANICAL PROPERTIES

The knowledge about chemical characteristics of pulp is important in the process of papermaking. This study aimed to correlate the chemical characteristics of pulp with the optical and physical-mechanical properties of paper. The determination of optical properties and physical-mechanical paper were made by the TAPPI (1992) norms. The carbohydrate composition of the bleached pulps was adapted from the Tappi T 249 cm-85 procedure and hexenuronic acids were determined by the Vuorinen (1996) method. The content of xylan showed an r= -0.3411 for the tensile index; r= 0.3307 for the tear index; r= 0.5587 resistance to air flow and r= 0.4504 for opacity. The content of glycans showed r= 0.2534 for the tensile index; r= -0.3950 for the tear index; r= -0.078 and for resistance to air flow and r= 0.5870 for opacity. The hexenuronic acids showed r= -0.2517 for the tensile index; r= -0.2433 for the tear index; r= 0.2028 for the resistance to air flow and r= -0.7245 for opacity The comparison among the samples showed none significance with the F test. This indicates that the chemical characteristics of the pulp do not influence the optical properties and physical and mechanical properties of paper. Conhecer as caracter -sticas qu -micas da polpa celul 3sica fundamental no processo de fabrica § ￡o do papel. Este trabalho teve como objetivo correlacionar as caracter -sticas qu -micas da polpa celul 3sica com as 3pticas e f -sico-mec ￠nicas do papel. Foram determinadas as propriedades 3pticas e f -sico-mec ￠nicas do papel, a composi § ￡o polissacar -dica das polpas branqueadas e os cidos hexenur ′nicos. O teor de xilanas mostrou r= -0,3411 para o -ndice de tra § ￡o; r= 0,3307 para o rasgo; r= 0,5587 para a resist ancia passagem de ar e r= 0,4504 para a opacidade. O teor de glicanas mostrou r= 0,2534 para o -ndice de tra § ￡o; r= -0,3950 para o -ndice de rasgo; r= -0,078 para a resist ancia passagem de ar e r = 0,5870 para a opacidade. Os cidos hexenur ′nicos mostraram r= -0,2517 para o -ndice de tra § ￡o; r= -0,2433 para o de rasgo; r= 0,2028 para a resist ancia passagem de ar e r= -0,7245 para a opacidade. As compara § μes amostradas n ￡o foram significativas. Sendo assim, o estudo aponta para o fato de que as caracter -sticas qu -micas da polpa celul 3sica n ￡o influenciam nas propriedades 3pticas e f -sico-mec ￠nicas do papel.