Observatorio de I+D+i UPM

Memorias de investigación
Book chapters:
Electrical Resistance vs Moisture Content in Four Different Types of Cork Products
Year:2012
Research Areas
  • Engineering
Information
Abstract
Cork is the main non-wood forest product in the western Mediterranean; development of its potential uses requires a detailed knowledge of its properties. One of the variables affecting cork behaviour is moisture content, currently determined by means of electric resistance moisture meters. We have studied the hygroscopic behaviour of different types of cork products (natural and agglomerated), and obtained electrical resistance-moisture curve for each. Specimens were conditioned in climate chambers (20ºC, four different relative humidity ?RH,%- conditions). Equilibrium moisture (EMC, %) and electrical resistance (R,?) were determined for each specimen. Resistance-moisture curves were adjusted using the equation: log (log (R) + 1) = a + b?EMC. Results showed significant differences for EMC and R-EMC curves among the different types. Individual models adjusted better (R2 between 0.909 and 0.992) than the aggregated model, and showed smaller typical errors (0.01 %EMC - 0.04 %EMC vs 0.05 %EMC). The aggregated model showed systematic errors up to 1 %EMC (for RH=85%). We have concluded that precision of resistance hygrometers increases significantly by using resistance-moisture curves adjusted for each type.
International
Si
Book Edition
Book Publishing
Nova Science Publishers
ISBN
978-1-62081-986-9
Series
Materials and Manufacturing Technology
Book title
Wood and Wood Products
From page
109
To page
124
Participants
  • Autor: Jose Ramon Gonzalez Adrados (UPM)
  • Autor: Florentino González Hernández (INIA)
  • Autor: Juan Ignacio Fernández-Golfín Seco (UPM)
  • Autor: José Luis Gacía de Ceca (INIA)
  • Autor: María Conde García (UPM)
  • Autor: Francisco Garcia Fernandez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Tecnología de la Madera y el Corcho
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