Fluid sprinkling – spraying – and diffusing – Processes
Patent
1999-01-29
2000-10-03
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Processes
239399, 239722, B05B 1700, B05D 1700
Patent
active
061260843
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method for spraying a field crop with a plant protective liquid in the shape of a number of clouds of atomized liquid which are sent out in the direction of the field crop through a number of liquid nozzles placed on a sprayer boom which, at the same time, is driven across the field crop.
Protecting e.g. crop in this way against attacks of for instance fungi and insects has been known for a long time. In order to obtain an effective protection, the atomized liquid cloud must be able to penetrate into the crop and cover all parts of the crop surface, and it has therefore been necessary to use abundant quantities of plant protective liquid. For this reason, this known method cannot meet the demands made today to dosage of plant protective liquids out of consideration of the environment.
The development within the spraying technology has furthermore resulted in the fact that high spraying pressure is employed in order to obtain an atomized liquid cloud of extremely fine liquid particles which can be deposited in a very thin coat on the crop surface. It is thereby possible to reduce the quantity of crop spray, but the atomized liquid cloud will, at the same time, be very sensitive to drifting. In windy weather, the liquid cloud can therefore be likely to drift whereby the spraying will be uneven and damage can be done to the neighbouring fields.
From the Danish lay open publication No. 156806 B is known a field sprayer with a sprayer boom which, besides liquid nozzles, has air nozzles for sending an air current down towards the crop in the shape of an air curtain for preventing the atomized liquid cloud from drifting in windy weather. The air current opens furthermore the crop for the liquid cloud which therefore easily can penetrate into and be deposited on all parts of the crop surface. With this field sprayer, it has been possible to obtain an effective spraying with a heavily reduced quantity of crop spray. The liquid stream and the air current have a more or less laminar character and will therefore easily be driven out of position by great wind forces, unless the liquid stream and air current have a relatively higher velocity in relation to the wind velocity, whereby the quantities of crop spray and air used are increased correspondingly.
In order to eliminate the above said disadvantages of the known methods, it is the object of the invention to provide a method of the kind mentioned in the preamble, whereby a field crop can be sprayed at optimum with a minimum use of plant protective liquid.
The novel and unique features according to the invention, whereby this is achieved is the fact that each atomized liquid cloud is put into whirling movement. Thereby the atomized liquid cloud assumes the shape of a whirl which, as known, is extremely stiff and stable to external influences. The whirl is therefore not sensitive to drifting even in high wind. A second advantage is that the atomized whirl opens the crop and penetrates into all parts of this.
When the atomized clouds are transformed, in this way, into whirls, there is no need for an air curtain to protect the atomized liquid cloud from drifting to the same extend as in the field sprayer known from the said Danish lay open No. 156806 B. An air curtain can, however, support the stability of the atomized liquid clouds against drifting and especially so if it consists of a number of air currents which are also put into whirling movement.
By letting the atomized whirls and the air whirls whirl in the same direction, they will be inclined to merge into each other and become one single, strong whirl having a very high resistance to the effects of the wind. The atomized whirls and the air whirls are, in this way, literally woven into one coherent curtain of an unprecedented stability against drifting in high wind.
It is, however, an advantage when each of the two adjacent and thus melted together, strong whirls have opposite directions of rotation, since the whirls, at least to some extend, are overlapping each other. If the two adjace
REFERENCES:
patent: 3339846 (1967-09-01), Guetet
patent: 4927080 (1990-05-01), Alsing
patent: 4982898 (1991-01-01), Ballu
patent: 5176322 (1993-01-01), Sator
Kashnikow Andres
O'Hanlon Sean P.
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