Optimization in the application of varnishes barries on cartonboard packaging.


In this work adjustments in the rotogravure printing process are proposed to the varnish water vapor
transmission rate (WVTR) aiming to obtain results smaller than 20g/m²/24h. One case study was used
for the propositions for improvements, where focused on varnish application process in a gravure
printer for an eight-printing unit cartonboard packaging, maximum printing speed of 175 m/min and
a 285 g/m² weight cartonboard. The possible variables that influenced the WVTR result were selected
from the technical expertise of the people involved in the project, the analysis in the printing process
with the application of directed trials using experimental designs (DOE). After realizing forty four
trials in a printing machine, were identifying and defined thirteen process adjustment parameters to
the best analysis. The project was developed for a cartonboard packaging with a varnish water vapor
transmission rate (WVTR) with capacity to pack 500g of a product. The obtained results allowed
the proposition for improvements in the studied printing process, used by the print shop to reduce
significantly the WVTR used. The records of the results are an average of 25.98g/m²/24h, before the
study, and after implementation of improvements there was a reduction to 18.16g/m²/24h in the average
of the results, 1.84 g/m²/24h below the target. The WVTR standard deviation was from 8.95 g/m²/24h to
2.22 g/m²/24h, thus presented better process stability. There are large number of solvents and resins,
which can be applied in rotogravure machines, and each has its specificities. Based on all the expertise
acquired from the study, it is possible to propose a line of work to find precise adjustments in the
varnish application. Therefore this study addresses an important approach to the future of sustainable
packaging, which contains little information in technical literature.

ANDRADE, Andre Ramalheiro de; RODRIGUES, Maria Isabel; MACHADO, Eduardo Luiz. Optimization in the application of varnishes barries on cartonboard packaging. Journal of Applied Packaging Research, v.13, n.1, 16 p., 2021.

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