Abstract
The overall mechanical behaviour of a series of experimental Mater-Bi made thin low-tunnel films is analysed with respect to the effect of two major factors: the film processing optimisation during manufacturing and the design of the low-tunnels structural system. The analysis of the mechanical behaviour of the biodegradable low-tunnel films, based on the results of extensive full-scale and small-scale experiments, combined with laboratory testing of the mechanical properties of the film, proves that a rather good mechanical behaviour is possible for these films, comparable to the behaviour of conventional agricultural films in terms of strength, provided that two criteria are met: (a) the low tunnel structural design is based on the initial stress at yield value of the film, which represents the asymptotic value of the tensile strength of the film, following its evolution with the time of exposure to real field conditions; (b) the processing of the film is optimised for the particular biodegradable material and film thickness under consideration. It is also confirmed that the stabilisation schemes used with conventional polyethylene films are not suitable for the biodegradable films.
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Notes
Bioplastics: ‘Biodegradable plastics for environmentally friendly mulching and low tunnel cultivation’, QLK5-CT-2000-00044.
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Acknowledgments
This work has been carried out in the framework of the European research project Bioplastics: ‘Biodegradable plastics for environmentally friendly mulching and low tunnel cultivation’, QLK5-CT-2000–00044, funded by the EU. Special thanks are due to Dr. A.Mistritis for his work on the electronic measurement and analysis of the wind data, Mr. G.Makris, for collecting the samples and supervising the experiments in the experimental field in Athens, to N.Chronopoulou for performing the mechanical tests and to Mr. D.Giannopoulos for the technical support.
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Briassoulis, D. Mechanical Performance and Design Criteria of Biodegradable Low-tunnel Films. J Polym Environ 14, 289–307 (2006). https://doi.org/10.1007/s10924-006-0037-0
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DOI: https://doi.org/10.1007/s10924-006-0037-0