New tools for extracting cork from Quercus suber L.: increasing productivity and reducing damage
Abstract
Aim of study: The aim of this study is to test new tools designed to debark cork oak trees: mechanized tools to perform cutting operations (IPLA-Morell, Stihl MC200 and COVELESS) and manual tools to separate and extract the cork (cork pincers, MIJURO).
Area of study: Southwestern Spain.
Material and methods: One of the longstanding problems affecting the sector is the shortage of skilled labor to perform debarking due to the difficulty of handling axes and the temporary nature of the work. To overcome these problems, four debarking systems using the new tools were designed according to the morphological properties of cork oak. The viability of the debarking systems were evaluated based on productivity (kg · person–1 · hour–1), production costs (€ · t1) and percentage of pieces smaller than 400 cm2 (%), and compared with the traditional system. Debarking quality and operator experience were also evaluated. A total of 204 trees were debarked.
Main results: The new systems obtain better results: productivity is higher, the percentage of pieces is slightly lower and production costs are reduced, except for one system. Debarking quality improves with the new tools as cork is extracted in a more precise and cleaner manner, thus permitting cork manufacturers to obtain higher yields from the cork planks.
Research highlights: Semi-skilled operators using the new tools obtain very similar results to skilled operators using axes. This would therefore resolve the problem of the lack of skilled labor, while improving the working conditions of operators. The results demonstrate that the new tools are viable for cork debarking and can bring potential benefits to the sector.
Key words: Q. suber L.; cork debarking; mechanization; productivity; cork stripping damage; axe; IPLA_Morell, Sthil MC 200, COVELESS.
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References
Almeida AM, Tome J, Tome M, 2010. "Development of a system to predict the evolution of individual tree mature cork caliber over time." Forest Ecology and Management 260(8): 1303-1314. http://dx.doi.org/10.1016/j.foreco.2010.07.017
Antolín PG, Díaz A, González JA, Guerra M, Iglesias JM, Maestre A, Peralta A, Pianu, B, Del Pozo JL, Robledano L, Rodríguez MA, Sánchez L, Santiago R, Sanz J, Vasco A, 2003. La máquina IPLA para el descorche. IPROCOR, Junta de Extremadura, Merida, Spain.
Cardillo E, 2000. Caracterización productiva de los alcornocales extreme-os. Congreso mundial del alcornoque y del corcho. Lisboa, Portugal.
CELIEGE, 2005. Código Internacinal de Prácticas Suberícolas. Proyecto Subernova. Mérida-vora.
Celis M. and Caseras J, 2009. "Estudio comparativo del rendimiento y viabilidad economica de los métodos mecanizados de extraccion del corcho". Revista Forestal Espa-ola 43: 7-25
Costa A, Oliveira AC, Vidas F, Borges JG, 2010. "An approach to cork oak forest management planning: a case study in southwestern Portugal." European Journal of Forest Research 129(2): 233-241. http://dx.doi.org/10.1007/s10342-009-0326-y
Costa A., Pereira H, Oliveira A, 2004. "The effect of corkstripping damage on diameter growth of Quercus suber L." Forestry 77(1): 1-8. http://dx.doi.org/10.1093/forestry/77.1.1
Graca J, Pereira H, 2004. "The periderm development in Quercus suber." Iawa Journal 25(3): 325-335. http://dx.doi.org/10.1163/22941932-90000369
Instituto del Corcho, la Madera y el Carbón Vegetal, ICMC, 2007. "La experiencia de IPROCOR con las máquinas de descorche". Inedito. Mérida, Spain.
Ilic JC, 2001. Wood: Electrical Properties. Encyclopedia of Materials: Science and Technology. Oxford, Elsevier: 9629-9633. http://dx.doi.org/10.1016/B0-08-043152-6/01744-7
Joffre R, Vacher J, Delosllanos C, Long G, 1988. "The dehesa, an agrosilvopastoral system of the Mediterranean region with special reference to the Sierra Morena area of Spain." Agroforestry Systems 6(1): 71-96. http://dx.doi.org/10.1007/BF02220110
Leal S, Nunes E, Pereira H, 2008. "Cork oak (Quercus suber L.) wood growth and vessel characteristics variations in relation to climate and cork harvesting." European Journal of Forest Research 127(1): 33-41. http://dx.doi.org/10.1007/s10342-007-0180-8
Marat-Mendes JN, Neagu ER, 2003. "The study of electrical conductivity of cork." Ferroelectrics 294: 123-131. http://dx.doi.org/10.1080/00150190390238757
Martínez Arias R, 1999. El análisis multivariante en la investigación científica. Ed. La Muralla y Hespérides. Madrid.
Mederski PS, 2006. "A comparison of harvesting productivity and costs in thinning operations with and without midfield." Forest Ecology and Management 224(3): 286-296. http://dx.doi.org/10.1016/j.foreco.2005.12.042
Miyata E, 1980 Determining fixed and operating cost of logging equipment. General Technical Report NC-55, Forest Service North Central Forest Experiment Station, St. Paul, MN. 14 pp.
Montero G, Torres E, Ca-ellas I, Ortega C, 1996. "Models for the prediction of cork production in cork oak stands". Forest Systems 5(1): 97-127
Moreira F, Duarte L, Catry F, Acacio V, 2007. "Cork extraction as a key factor determining post-fire cork oak survival in a mountain region of southern Portugal." Forest Ecology and Management 253(1-3): 30-37. http://dx.doi.org/10.1016/j.foreco.2007.07.001
Nieto R, Soria J, 1995 Motores y maquinaria forestal. Consejeria de Agricultura y Pesca. Govern of Andalusia
OJ, 1986. Ley 1/1986, de 2 de mayo sobre la Dehesa de Extremadura. Diario Oficial de Extremadura. 15/05/1986.
OJ, 1988. Orden de 26 de septiembre de 1988, por la que se dan instrucciones para la ejecución de determinados trabajos en montes, en régimen privado, poblados con encinas y alcornoques. Boletín Oficial de la Junta de Andalucía., 11/10/1988.
Oliveira G, Costa A, 2012. "How resilient is Quercus suber L. to cork harvesting? A review and identificacion ok knowledge gaps". Forest Ecology and Management 270: (257-272) http://dx.doi.org/10.1016/j.foreco.2012.01.025
Peralta A, 2003. Estudio de la máquina IPLA para el descorche. Universidad Politécnica de Madrid, Spain.
Pereira, H, 2007. Cork. Amsterdam, Elsevier Science B.V.
Pinto-Correia T, 2000. "Future development in Portuguese rural areas: how to manage agricultural support for landscape conservation?" Landscape and Urban Planning 50(1-3): 95-106. http://dx.doi.org/10.1016/S0169-2046(00)00082-7
Prades C, 1996. Bases para la utilización de un sistema de aprovechamientos mecanizado de alta tecnología. Doctoral Thesis, Universidad Politécnica, Madrid, Spain.
Prades C, Gómez I, Sánchez F, 2009. El perfil del corchero en el Parque Natural Los Alcornocales y su opinión sobre el sector. EuropaCork 44: 36-40.
Ribeiro F, Tome M, 2002. "Cork weight prediction at tree level." Forest Ecology and Management 171(3): 231-241. http://dx.doi.org/10.1016/S0378-1127(01)00780-0
Sanchez-Gonzalez M, Canellas I, Montero G, 2008 "Baseage invariant cork growth model for Spanish cork oak (Quercus suber L.) forests." European Journal of Forest Research 127(3): 173-182. http://dx.doi.org/10.1007/s10342-007-0192-4
Santiago R, 2009. Défis de l'UE concernant le secteur du liège. Presentación en el Grupo Consultivo Forestal y Corcho (20 de febrero de 2009). Bruselas (Bélgica).
Timm N, 2002. Applied Multivariate Analysis. Springer. New York.
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