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O desgaste dos bicos de pulverização afeta, entre outras características, principalmente a vazão. Ensaio realizado com bicos de cone vazio tipo disco mostrou, em certos casos, aumentos superiores a 100% sobre a vazão inicial, já nas primeiras 50 horas de operação. Evidentemente, isto também conduz a um aumento de mais de 100% na quantidade de defensivos aplicados, caso o usuário não se aperceba do problema. Observou-se menor influência do aumento do orifício do disco sobre a vazão. Por outro lado, os helicóides apresentaram pronunciado desgaste, afetando diretamente a vazão. Esse desgaste ainda alterou a característica do cone de pulverização do bico, preenchendo o seu centro. Foi notada também redução do ângulo do cone, bem como aumento do tamanho das gotículas. In this paper it was studied the abrasive action of a copper oxichloride spray mixture on some disc type hollow cone spray nozzles under usual pressures. Changes in spray nozzles characteristics were noticed during the work as increasing in the flow-rate, decreasing in the spraying angle, and filling of the hollow cone with high density of spray droplets. The flow rate change is of main importance because if neglected it may contribute to excessive deposition of pesticides on the plants. Beyond the pesticides wastage it implies in great hazzard to environmental contamination and phyto-toxicity. Among the nozzles components tested the core showed higher wearing. The one made of brass was more sensitive to abrasive action of spray mixture than nylon ones, while that of stainless steel showed to be the strengthest. The influence of the nozzles wearing on the flow-rate, angle cone, and cone spray pattern was analyzed in function of the time of operation. To determine the droplet parameters, droplet analyses of new spray nozzles and after 100 hours of use were made

Desgaste de bicos de pulverização pelo uso de formulações cúpricas