ISO 633:2019 pdf download

ISO 633:2019 pdf download.Cork — Vocabulary
1 Scope
This document defines cork as a raw material for the industry, as well as the terms to be used in describing the different forms in which cork can be found. This document also indicates the terms and definitions concerning its main products, some of the operations to which cork can be submitted and anomalies that can be associated with it.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: 一ISO Online browsing platform: available at https://www.iso.org/obp – IEC Electropedia: available at http://www .electropedia.org/
3.1.1.2 layer
vein suberous tissue produced during a one yearly growth cycle of the cork oak, comprising a high- coloured large softer band formed at the begin- ning of the year, the spring layer, and a thinner darkish band grown towards the end of that year, the autumn layer Note 1 to entry: The number of layers formed from the beginning of the cork’s growth determines the number of years of the cork bark, i.e. its“age”.
3.1.1.3 lenticel
radial canals which allow essential gaseous exchanges between the tree tissues and the atmosphere
3.1.1.4 pore
opening of the lenticels (3.1.1.3), in cross-section Note 1 to entry: The surface of the lenticels in cross- section is called porosity. This surface is taken into account when visually classifying the cork stoppers (3.4.1.3).
3.1.1.8 stripping
extraction of part of the cork (3.1.1.1) bark covering living cork oak trees, performed every 9 years at least. It is carried out during the period of the year that physiologically allows its easy separation from the tree, without causing damage to the tree’s vascular cambium Note 1 to entry: In French, different terms are used for the first extraction ” demasclage” and for subsequent extractions “levee”. In English, the term “stripping” is always used for all the extractions.
3.1.2 Types of cork resulting from stripping
3.1.2.1 virgin cork cork (3.1.1.1) obtained from the first stripping (3.1.1.8) of the trunk and branches Note 1 to entry: This type of cork is called “cortica de desboia” in Portugal. If it is virgin cork from living trees where the cork has been stripped from a level over the preceding stripping it is called “cortica de aumentos” in Portugal.