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EP0461173A1 - Dispositif d'application d'une couche - Google Patents

Dispositif d'application d'une couche

Info

Publication number
EP0461173A1
EP0461173A1 EP19900904397 EP90904397A EP0461173A1 EP 0461173 A1 EP0461173 A1 EP 0461173A1 EP 19900904397 EP19900904397 EP 19900904397 EP 90904397 A EP90904397 A EP 90904397A EP 0461173 A1 EP0461173 A1 EP 0461173A1
Authority
EP
European Patent Office
Prior art keywords
particulate material
body shell
baffles
fluid coating
agitator elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19900904397
Other languages
German (de)
English (en)
Inventor
Peter Robin Mason
Brian Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corteva Agriscience LLC
Original Assignee
Dow Chemical Co Ltd
DowElanco LLC
Dow Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co Ltd, DowElanco LLC, Dow Chemical Co filed Critical Dow Chemical Co Ltd
Publication of EP0461173A1 publication Critical patent/EP0461173A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
    • A01C1/06—Coating or dressing seed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B1/00—Preparing grain for milling or like processes
    • B02B1/04—Wet treatment, e.g. washing, wetting, softening
    • B02B1/06—Devices with rotary parts

Definitions

  • This invention concerns a device for smoothing out a fluid coating applied on particulate material, and in particular to a device for smoothing out a fluid coating, for example a pesticide, on seeds.
  • a device for applying a fluid coating material to a particulate material, said device having a generally upright circular body, which has an inside wall surface defining a flowpath for passage of the particulate material therethrough, which comprises, a device for making uniform a fluid coating material on a particulate material, said device comprising a generally upright circular body shell, having an inside wall surface defining a flowpath for passage of the particulate material downwardly therethrough, with a) means for feeding the particulate material to the interior of the upper part of the body shell promptly after fluid coating material has been applied thereto, b) a rotatable shaft extending upwardly and axially towards the means for feeding and within and generally along the length of the body shell, c) an array of agitator elements spaced along and affixed to the shaft for rotation therewith, the agitator elements each having a proximal end attached to the shaft and
  • the device is suitable for applying a pesticidal material to agricultural seeds, although the device is not limited to such application.
  • the fluid material is preferably a liquid, for example, an aqueous or non-aqueous pesticidal composition which may be of conventional form.
  • the device according to the invention may also be utilized to apply fluid compositions in powder form.
  • the device of the present invention is not limited to the use of applying pesticides onto seeds, but may advantageously be employed to apply selected fluid coating onto selected particulate material.
  • the device comprises a generally upright circular body shell, having an inside wall surface defining a flowpath for passage of the particulate material therethrough.
  • Means are provided for feeding the particulate material to the interior of the upper part of the body, to cause the particulate material to pass downwardly through the body cavity under gravity.
  • a rotatable shaft extends generally axially within the body, and has a plurality of agitator elements spaced along and affixed to it, for rotation with it.
  • the agitator elements each have a proximal end attached to the shaft, and a distal end directed generally radially towards the inside wall surface of the body.
  • Means are provided for supporting and rotating the shaft within the body at a controllable constant rate.
  • a spray head is preferably provided for applying the fluid coating material (typically, a pesticide) to the particulate material (for example seeds) , prior to contact of the particulate material with the said agitator.
  • the spray head may be provided within the upper part of the body, or externally of the body such that the particulate material may be treated prior to its entry into the body.
  • the agitator elements are so shaped as to provide a decreasing amount of agitation to the particulate material as it passes downwardly through the body.
  • the agitator elements in the upper part of the body may be generally in the form of plates of blades, angled so as to direct the falling particulate material momentarily generally upwardly against the gravitational flow, whereas the agitator elements in the lower part of the body may be rods or bars or the like. It is desired to produce decreasing agitation as the particular material passes downwardly through the body to ensure even distribution over the particulate material.
  • the lower part of the body functions mainly as a drying chamber. A sufficient amount of drying takes place (particularly in the case of agricultural seeds) so that the material emerging from the coating device can be packed and shipped. Left undisturbed, the fluid coating material distributed in the upper part of the body can tend to cause the material to agglomerate, so that it is not free flowing. In order to prevent possible agglomeration agitation is provided in the lower part of the body, but this agitation is of a much lower degree than is provided in the upper part of the body.
  • the agitator elements are tapered towards their radially extending distal ends in such a manner as to tend to equalize the shear applied to the particulate material over the length of the agitator elements. It has been found that shaping the agitator elements in this way to equalize the shear applied to the particulate material along the length of the agitator elements gives rise to a particularly advantageous distribution of the fluid coating material over the surface of the particulate material.
  • a plurality of baffles are mounted on the inside wall of the body.
  • the baffles are so positioned that all of the particulate material passing through the device must necessarily encounter at least one of the baffles, there being no direct downward straight-line path through the body by which the baffles may be avoided.
  • the baffles preferably extend around substantially the entire circumference of the said inside wall.
  • the baffles have a deflecting surface so angled as to face inwardly, so as to deflect downwardly flowing particulate material in a direction generally towards the shaft.
  • baffles When baffles are employed which do not extend around the entire circumference of the inside wall, their leading edges are preferably inclined so as to disrupt plug rotation of the particulate material, for example, they may be inclined at an angle of from 30° to 80° to the vertical, preferably 40° to 70°, most preferably 60°, and so angled as to face uDwardly, and
  • the baffles are somewhat interdigitated with the agitator elements, and the clearance between the distal ends of the agitator
  • shear imparted to the particulate material is from 5 to 50 sec-1. Shear is defined to be the difference in velocity between two layers, divided by the distance
  • the velocity of the layer of particular material adjacent the agitator element may be considered to be the same as that of the agitator element, and the layer of material adjacent the inside wall surface of the body
  • the applied shear may, therefore, be calculated in terms of the relative velocity of the agitator element tips and the inside wall.
  • the rate of shear is from 5 to 50 sec-1,
  • Q preferably from 10 to 30 sec- 1 -, more preferably
  • the agitators elements may be of any desired shape, for example they may be circular or square in cross section, but as indicated above, in a preferred embodiment are shaped so as to direct the falling particulate material generally upwardly, against the gravitational flow.
  • they may be triangular in cross section, or may take the form of an angled plate, preferably having a leading surface which forms an angle of from 20° to 75° from the vertical, preferably 60°.
  • the baffles employed in accordance with the third aspect of the invention extend around the entire periphery of inside wall surface of the body, because this configuration results in the best mixing, and allows the shortest possible body length. It is, however, possible to provide short gaps in the baffles, provided that such gaps are not aligned with each other in adjacent baffles so as to provide a direct flow path for the particulate material, without deflection towards the shaft.
  • the deflecting surface of the baffles is preferably at an angle of from 30° to 80° from the vertical, preferably from 40° to 70°, more preferably 60°.
  • the device in accordance with the invention will generally also include measuring means for ensuring that the appropriate dosage of the fluid material is applied.
  • Such measuring means may include means for measuring the flow rate of the incoming particulate material (e.g. , seed) and fluid coating material (e.g., pesticide), and may preferably also include means for weighing treated particulate material, and means for indicating the level of material in the body, for example, a proximity sensor.
  • the device may also include means for indicating the dosage rate applied, in dependence upon the said measuring and sensing means.
  • the invention includes within its scope a method for the application of a fluid coating material (e.g./ pesticidal material) to particulate material (e.g., seeds) employing a device as described above. Also included are particulate materials thus treated.
  • a fluid coating material e.g./ pesticidal material
  • particulate material e.g., seeds
  • particulate materials thus treated.
  • Figure 1A is a schematic elevation, partially in section of a device in accordance with the first and second aspects of the invention.
  • Figure IB is a schematic elevation, partially in section of a device in accordance with the first aspect of the invention.
  • Figure 2A is a sectional view of the device of Figure 1A, taken along the line 2-2.
  • Figure 2B is a sectional view of the device of Figure IB, taken along the line 5-5,
  • Figure 3 is a schematic elevation, partially in section of a device in accordance with the first and the third aspects of invention.
  • a coating device for applying a fluid coating material (e.g., pesticide) to particulate material (e.g., seeds) is shown, which device comprises a generally upright circular body shell 1, having an inside wall surface 2, defining a flow path for passage of the particulate ⁇ material. Means not shown are provided for feeding the particulate material to the upper part of the body through the feed opening 3, in direction of arrows 4.
  • a fluid coating material e.g., pesticide
  • particulate material e.g., seeds
  • fluid coating material is applied to the particulate material, using a spray head (not shown) of the conventional "rolling cone" type.
  • the particulate material throughput through opening 3 is such as to maintain the body 1 substantially full of particulate material through the coating process.
  • the particulate material is allowed to pass the spray head at a convenient rate so that the fluid coating is selectively metered onto it.
  • a rotatable shaft 5 Centrally located within body 1 is a rotatable shaft 5, extending generally axially within body 1, and journalled for rotation in a bearing (not shown) in the direction of arrow 6.
  • Agitator elements 7 and 8 provided in the upper and lower part of body 1, respectively, are affixed to the shaft 5 for rotation therewith, and have their proximal ends attached to shaft 5, and their distal ends directed generally radially towards surface 2.
  • An electric motor (not shown) is provided for rotating shaft 5 in the direction of arrow 6, at a controllable constant rate.
  • Agitator elements 7 are in the form of angled blades, and are so shaped as to have a maximum cord line or width a., shown in Figure 2A, and to taper from the said maximum chord a both towards shaft 5, and (by virtue of tapered edges 9) towards their distally- directed tips.
  • the tapering edges 9 of agitators 7 tend to ⁇ equalize the shear applied to the particulate material, over the length of the agitators (i.e. over the radius of body 1).
  • the agitator elements 7 are angled so as to direct the falling particulate material generally upwardly, against their gravitational flow through the body, and serve to distribute the fluid coating material evenly over the surface of the descending particulate material.
  • paddle-like agitator elements 7 are replaced by smaller agitators 8, in the form of rods that are more or less circular in section.
  • the function of rods 8 is not primarily to further distribute the fluid coating material over the particulate material, but instead to agitate the particulate material continuously, so the agglomerations or clumping of the particulate material does not occur. It has been found that an excess of agitation to the particulate material once the drying process has begun is likely to result in the fluid coating materials being mechanically removed from the particulate material, leading to the formation of dust.
  • the agitator elements 8 are thus shaped to provide a gentle agitation, to minimize such removal.
  • FIG. IB and 2B a coating device generally similar in form to that of the device of Figures 1A and 2A, respectively is shown, which device has stationary baffles 61 which are similar to the agitator elements 7 of Figures 1A and 2A, except that the baffles 61 are fixed to the wall of the body shell, not to the shaft.
  • the leading edge 60 ( Figure 2B) is the edge which first contacts the particulate material if the shaft is rotated in the direction of arrow 6, and the agitator elements 62 form an angle to the horizontal.
  • a coating device generally similar in form to that of the device of Figures 1A and 2A, is shown, which device has a body 31, with an inside wall surface 32 defining a flowpath for particulate material 28.
  • Means 29, for example a conveyor belt, are provided for feeding the particulate material to the upper part of the body through the feed opening 33, in direction of arrows 4.
  • the particulate material is fed into the hopper head 46, in either a batch or continuous process.
  • the fluid coating is fed to the spray head 38, and contacts the particulate material within the hopper head (i.e., prior to the particulate material entering the body).
  • Particulate material enters body 31 via opening 33.
  • a shaft 35 is journalled in bearing 36 for rotation about a vertical axis, driven by an electric motor 42.
  • a spray head 45 of the rolling cone type applies fluid coating material 30 to particulate material falling through the hopper 46, in which the spray head 45 is mounted or suspended.
  • a plurality of agitator elements 37 of generally triangular cross-section extend from shafr 35 towards the wall 32.
  • a plurality of baffles 48 are mounted on wall 32, and each extends around the entire circumference of the inside wall. Baffles 48 have a deflecting surface 49 which is angled so as to deflect the particulate material generally inwardly toward the shaft 35.
  • the baffles 48 are interdigitated with agitators 37, and have a clearance such as to provide shear of from 5 to 50 sec ⁇ l when the device is in use.
  • a shear rate of 20 sec-1 will be achieved at a rotational speed of 64 rpm.
  • the clearance between the agitators and the inside wall surfaces is from 25 to 50 mm and the speed of rotation is such that the distal ends of the agitators have a velocity of from 1 to 2 m/s.
  • Additional agitators 66 in the form of round bars of relatively small diameter, are provided on the lower part of the shaft so as to provide a lesser degree of agitation to the particulate material than it experiences further up the body shell, so as to prevent agglomeration of the seeds without damaging the seeds during drying.
  • Treated particulate material leaves the body 31 via a discharge hopper 41, and is caused to discharge through a gate valve 50a or 50b into a sock 51, which rests on a weighing device 52.
  • a pair of capascitative proximity sensors 53 and 54 detect upper and lower permissible limits of particulate material in body 31, and metering pumps (not shown) are provided for metering the flow of particulate material and fluid material to hopper 46 and spray head 45.
  • Means (not shown) are also provided for producing a visuai display of the said flow rate, weight of material removed, and levels to enable the dosage applied to the particulate material to be accurately monitored and controlled.
  • the seeds When the particulate material is seeds, the seeds may then be planted in soil or potting medium, e.g., in a greenhouse or in the field and under ambient normal growth conditions the seeds develop into plants which flower and develop seeds.
  • soil or potting medium e.g., in a greenhouse or in the field and under ambient normal growth conditions the seeds develop into plants which flower and develop seeds.
  • plant includes seed capable of being germinated into a whole fertile plant; plant cells; plant protoplasts; plant cell or tissue cultures from which a plant can be regenerated; plant calli; plant clumps; and plant cells that are intact in a plant or parts of a plant, such as : flowers, kernels, ears, cobs, leaves, husks, stalks, and similar parts or tissues.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Pretreatment Of Seeds And Plants (AREA)

Abstract

Cette invention concerne un dispositif pour l'application d'un matériau fluide à une matière particulaire. En particulier, elle se rapporte au dispositif qui convient pour l'application de pesticides et similaires aux semences agricoles et horticoles.
EP19900904397 1989-02-28 1990-02-26 Dispositif d'application d'une couche Withdrawn EP0461173A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8904542 1989-02-28
GB898904542A GB8904542D0 (en) 1989-02-28 1989-02-28 Coating device

Publications (1)

Publication Number Publication Date
EP0461173A1 true EP0461173A1 (fr) 1991-12-18

Family

ID=10652451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900904397 Withdrawn EP0461173A1 (fr) 1989-02-28 1990-02-26 Dispositif d'application d'une couche

Country Status (4)

Country Link
EP (1) EP0461173A1 (fr)
CA (1) CA2011185A1 (fr)
GB (1) GB8904542D0 (fr)
WO (1) WO1990009733A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108738494A (zh) * 2018-06-23 2018-11-06 吴永凤 一种农业用种子拌药装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155542A (en) * 1960-09-22 1964-11-03 Ben Gustason & Son Mfg Company Cottonseed-treating machine
HU177350B (en) * 1978-01-02 1981-09-28 Mezoegaz Gepgyar Szolgalt Vall Seed dressing machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9009733A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108738494A (zh) * 2018-06-23 2018-11-06 吴永凤 一种农业用种子拌药装置

Also Published As

Publication number Publication date
GB8904542D0 (en) 1989-04-12
WO1990009733A1 (fr) 1990-09-07
CA2011185A1 (fr) 1990-08-31

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910828

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Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

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Effective date: 19920828

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: DOWELANCO

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19930308