Coating processes – Plant member or animal specimen coating
Patent
1985-10-21
1987-04-14
Lusignan, Michael R.
Coating processes
Plant member or animal specimen coating
47 576, 118303, 427212, 427425, A01C 106, A01G 506, B05B 1700, B05C 500
Patent
active
046577734
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for dressing seed which is subjected in freefall to dressing and which is subsequently thrown off outwards into a dressing chamber via a rotary table, and to an apparatus for carrying out this process, which has a dressing chamber which contains a seed dispensing and feed system and in which seed falling in freefall is subjected to a dressing delivered by a dressing distributor device and is deflected and thrown off by a rotary table arranged under the dressing distributor device.
BACKGROUND OF THE INVENTION
DE-C-531,382 describes a dressing apparatus with a dressing chamber, in which a jet of dressing is generated radially from a centrifugal disk outwards and is sprayed two-dimensionally. A continuous veil of seed falls down outside the centrifugal disk over the entire periphery, and the seed and jet of dressing meet one another along a circular line. Such an arrangement has not always proved entirely satisfactory, especially because some of the dressing settles on the walls of the apparatus and the seed grains can therefore never be enveloped to a sufficient extent.
In contrast to this, in the state of the art known from HU-A-157,922, the functions are partially reversed. Here, the product stream is thrown off in freefall onto a conical centrifugal grain plate arranged inside a dressing chamber. The free-falling stream of grains is acted upon over the entire length of its travel by two spray nozzles located opposite one another. The grain stream is deflected by means of the centrifugal grain plate and the retention time of the individual grains in the dressing space is increased, thus improving the mixing of the grains with the dressing.
However, the disadvantage of the two above-indicated solutions from the state of the art is that a considerable proportion of the dressing is sprayed onto the wall of the apparatus located opposite the dressing nozzle, and this is no longer desirable, especially where the mercury-free dressings used more and more frequently are concerned, since these dressings are sometimes extremely sticky and can form crusts on the walls of the apparatus. Furthermore, as can quickly be established by means of dressing patterns, the known apparatuses unfortunately do not ensure that the dressing is sufficiently distributed over the grain as desired, and even the distribution intensity varies greatly from grain to grain. When mercury-containing dressings were used, this was not so important because it was still possible to obtain via the evaporation stage a relatively uniform covering over all the grains, even in the bags filled for the user. This is because, as a result of the mercury vapor pressure, the substances diffuse in gas form more easily into the places on the grain, even into uneven regions and, for example, into the grain furrow, so that it was thereby possible to cover relatively effectively even hollow places with a protective layer via tiny crack orifices in the furrow region. More recently, however, new trends among users have become noticeable. One of these arises because the dressing is intended to exert a so-called aureola effect in the soil, that is to say some of the dressing on the grain sown in the soil dissolves, diffuses into the immediate vicinity and kills troublesome microbes and fungi in the soil within a certain circumference. A complete and uniform covering with dressing is not absolutely necessary for this. However, objections to the effect that this method should preferably not be used for seed have been raised more recently on ecological grounds.
In some countries, the use of mercury for dressings is prohibited because of the toxicity of mercury, so that new solutions have to be sought from both the chemical and the constructive point of view, so that at the very least the quantities of poison required can be kept as low as possible.
Starting from this, the object on which the invention is based is to develop a seed dressing process which produces an excellent dressing effect, whilst at the sa
REFERENCES:
patent: 4320715 (1982-03-01), Maloney et al.
patent: 4360545 (1982-11-01), Maloney et al.
Gebruder Buhler AG
Lusignan Michael R.
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