MORPIIOLOGICAL COMPOSITION OF WEB-BREAK INDUCING SHIVES IN COMMERICAL NEWSPRINT PULP

Abstract

Web-bnab dUring poper production causl? a so-iow incOtJWnience in produCtion pnxus and ;"awI? COlt of production.' Earlier studies
indicate that web breakJ occur at tensions far belOw the ultimate 'tensile strength mlues determined by tensile tuting in the laboratory. It
~ abo reported that most of the web-breaks were ~ ca~,d by sbw .. (JmndJe of unsepararedjiberJ). In this paper the re$1.llt of an investigation an lhe morphological composition of shives in commerd~l
newJprini pulp at dwhole and those cawing wehbnakJ is preJenred. It waJ found that 93% of the shives -re earlywood and only 7% late"l\!ood. II was also deurmined that latewood shives are the null" ,causes of web-break More than 90% of the' web-break indUCing shives were found to be fatewood "hives.