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Silva Lusitana

Print version ISSN 0870-6352

Abstract

PESTANA, Miguel; LOUZADA, José  and  SARDINHA, Raúl. Classification of Cork Oaks for the Production of Cork, Appealing to an Objective Criterion: Part II - The Test Tubes (the Tables). Silva Lus. [online]. 2005, vol.13, n.2, pp.181-201. ISSN 0870-6352.

This article is a follow up to the article already published entitled "Classification of the corks for the stopper production, using a objective criterion". Part I-The Strips, and intends to contribute towards better knowledge of the quantitative qualification of cork. It also aims to consolidate the creation of a classification based on reproducible objective parameters independent of the operator in order to expedite the processes. The evaluation parameters used, such as porosity (through image analysis), specific gravity, calibre, humidity, rupture strength and the corresponding angle, were collected on cork planks prepared for that purpose. The qualitative classification developed by CARVALHO (1993) (punctuation criterion), applied to the cork samples was compared to those generated using the data from the physical characteristics criterion, obtained from cork of the same sample trees. The results of this work show that: - The objective classification based on physical and mechanical parameters, assures the reproducibility of the results. This does not happen with the punctuation criterion. - The results of the samples taken from cork strips are coherent with the results of the cork strips, since they have great similarities. This reinforces the consistency of this criterion. - The new proposal of cork quality classification validated through numeric taxonomy analysis enabled the verification that all the samples of tree 320 and almost all of those of trees 36 and 37, have different classification to that attributed using the classification based on the punctuation criterion.

Keywords : quality; image analyses; suberine; mechanical tests; multivariate analyses.

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