n. 11/2023 127 TECHNOLOGY Chippers for every specific requirement with the associated operating costs for their disposal. As a matter of fact, wood chips are ideal for fueling cogeneration power plants which produce electricity and thermal energy simultaneously, gasification establishments and smallto medium-sized boilers. The flake conformation facilitates a continuous and homogeneous type of material loading, while its use in combustion results in the abatement of the use of fossil fuels. The chipper This machine is fairly widespread, given also the considerable market offer, from the simplest models with limited working capacity, often suitable for hobby-type realities, to those of large size, used at the professional level. In the latter case, chippers differ in the energy source: numerous models are driven via the tractor's PTO but also equipped with an autonomous motor (endothermic or electric), sometimes mounted on trucks for the machine's better mobility. Chopping machines to be coupled to the tractor can be connected to the three-point hitch or towed and have power requirements ranging from 60-70 to 200-250 Hp. Logically, the maximum diameter of the input material also varies from 30-40 to 6080 cm, respectively. For larger diameters, models with selfcontained engines up to 700-1,000 Hp are used to process pieces up to 800-900 mm in diameter. Truck-mounted chippers are obviously more suitable for road travel (up to 80 km/h) in high capacity settings, up to 400 m³/h. Electrically powered models obviously feature less noise and lower pollutant emissions, and typically have powers between 50 and 200 kW, capable of processing timber up to 250-450 mm in diameter. Again, on the subject, Pezzolato offers the PTH 1000, with a 200 kW electric motor, which can process logs up to 450 mm in diameter automatically and up to as much as 600 mm with a dedicated operator. Equipped with a drum-cutting device, it has a wide 100-cm inlet for productivity up to 200 m³/h, more than satisfactory for the common de urbano, anziché gestirli come meri “scarti”, con i connessi costi operativi per il loro smaltimento. Il cippato si rivela infatti ottimale per alimentare centrali a cogenerazione, che producono contestualmente energia elettrica e termica, impianti di gassificazione e caldaie di dimensioni medio-piccole. La conformazione in scaglie agevola un caricamento di tipo continuo e omogeneo del materiale, mentre la sua utilizzazione nella combustione permette l’abbattimento dell’impiego di combustibili di origine fossile. La cippatrice Si tratta di una macchina a diffusione piuttosto ampia, data anche la notevole offerta di mercato, dai modelli più semplici e di limitata capacità di lavoro, spesso adatti alle realtà di tipo hobbystico, a quelli di notevoli dimensioni, impiegati a livello professionale. In quest’ultimo caso, le cippatrici si differenziano per la sorgente di energia: sono disponibili numerosi modelli azionati tramite la PTO del trattore, ma anche dotati di motore autonomo (endotermico o elettrico), talvolta montati su autocarri per la miglior mobilità della macchina. Le cippatrici da accoppiare al trattore possono essere portate all’attacco a 3 punti oppure trainate, hanno una richiesta di potenza che varia tra 60-70 e 200-250 Cv. Logicamente, anche il diametro massimo del materiale in entrata varia rispettivamente da 30-40 a 60-80 cm. The broad versatility of modern chippers enables them to be profitably used in different work contexts, in all cases, with high productivity and excellent product quality
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