IMPACT OF THE RECYCLING PROCESS ON
KRAFTLINER PAPER PROPERTIES – A COMPARATIVE
STUDY BETWEEN EUCALYPTS AND PINE FIBERS
Caroline S. Araújo1
, Juliana C. Silva1
, Luciana A. C. Alexandre1
, Márcio L. Ferreira¹, Osvaldo Vieira1 1 Klabin S/A. Brazil
O PAPEL vol. 84, N.o 4, pp. 73 - 80 - APR 2023
ABSTRACT
In order to evaluate the recycling influence in the properties
of papers composed of eucalyptus short fibers only, such as the
Eukaliner®
, compared to papers composed of 100% pine long fibers,
a characterization of fiber was carried out and handsheets were
formed in the laboratory for physical and mechanical resistance
tests. The handsheets were submitted to the recycling process and
each cycle was refining operation in Bauer refiner. Seven refining
cycles were evaluated. The brown kraft pulps used in this essay
were collected directly from the industrial process. Both the
eucalyptus and pine fibers had reduction in the properties along
the cycles, which is inherent to the recycling process. The refining
partially recovered some physical-mechanical properties of the
paper obtained and the consumption of energy for refining proved
to be lower for the eucalyptus fiber.
The eucalyptus fiber had less impact in the length reduction
and remained more preserved in relation to the pine fibers after
consecutive recycling processes. The research showed that both
the eucalyptus and pine fibers presented acceptable resistance
along the seven recycling cycles assessed, overcoming the CCB2022
(Cepi Container Board) document values for testliner papers.
The relevance of this study is due to the increase in the offer
of short fiber in the market, the higher sustainability and the
lower cost in the eucalyptus production, the cellulose and paper
obtained, besides granting higher printing quality and better
performance in the conversion of those papers.
Key Words: Cellulose, eucalyptus, Eukaliner®
, recycling,
testliner, quality