CA2049026A1 - Plant spraying apparatus and method - Google Patents
Plant spraying apparatus and methodInfo
- Publication number
- CA2049026A1 CA2049026A1 CA 2049026 CA2049026A CA2049026A1 CA 2049026 A1 CA2049026 A1 CA 2049026A1 CA 2049026 CA2049026 CA 2049026 CA 2049026 A CA2049026 A CA 2049026A CA 2049026 A1 CA2049026 A1 CA 2049026A1
- Authority
- CA
- Canada
- Prior art keywords
- atomiser
- spray
- plant
- pumped
- liquid
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/035—Discharge apparatus, e.g. electrostatic spray guns characterised by gasless spraying, e.g. electrostatically assisted airless spraying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
Landscapes
- Catching Or Destruction (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Fertilizers (AREA)
Abstract
An apparatus and method for plant spraying are disclosed. Liquid plant spray is pumped at high pressure through one or more atomisers (28) to produce a mist having a small droplet size, i.e.
between 5 and 60 microns. The spray may be pumped to the atomisers through a hose (24) of nylon or other material which induces an electrostatic charge in the droplets.
between 5 and 60 microns. The spray may be pumped to the atomisers through a hose (24) of nylon or other material which induces an electrostatic charge in the droplets.
Description
WO go/~ 5 P~ 190/00102 -1- 2~ 2~
PLANT SPRAYING APPARATUS AND ME,THOD
FELD OF THE IN~ENTION
This invention rela~es to a spraying apparatus particularly but not necessarily exclusively for spraying plants with fungicide~ insecdcide and ~he like.
DESCRIPTION OF THE PRIOR ART
Conventional plant sprayers of one kind cornprise a rnotor driven centrifugal blower which blows air through a flexible pipe of relatively large bore (i.e. of the order of 50 mm diarneter). Liquid insecticide is led tO the flexible pipe through a feed pipe which is connected tO a tank for holding the insecticide. The insecticide is fed through the feed 13 pipe either by gravity, by putting the tank under the low air pressure generated by the blower, by ventun effect or by a combination of these. As the liquid enters the flexible pipe it forms into droplets which are entrained in the air strearn. Typically the size of the droplets emitted from a conventional plant sprayer is of the order of 250 to 400 rnicrons.
~0 It is a disadvantage of droplets of this size that thsre is a lot of wastage of the spray.
The reason for ~his is that when the droplets are deposited on the plant they have a marked tendency to coalesce into larger dsops which merely run off the plant under gsavity and are wasted.
Furthermore the conventional sprayers of the kind refelTed to above ase relatively slow in operation as ~e spray which they emit covers a rela~vely small area in each pass of the sprayer.
30 In another kind of plant sprayer large drops of the liql~id insecticide a~e dropped onto a spinning disc and become dissociated into droplets of small size. The output of spinning dise sprayers in however limiteL
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WO 90/1~05 PCT'/AU91)~00102 2~ 2-OBJECT OF THE INVENTION
It is an object of the invention to provide a sprayer which dis~ibutes ~he spray over a 5 crop in a more cost-effective manner; or at least to offer the public the choice of a sprayer of novel design.
SUMMARY OF THE INVENTION
10 According to the invention plant spraying apparatus compIises at least one atomiser and means to pump liquid plant spray through the atomiser at high pressure, the atomiser being such that the plant spray pumped therethrough emerges as a rnist the average droplet size of which is not grea2er than 100 microns.
15 Further according to the invention a methcd of plant spraying includes the step of pumping a liquid plant spray through an atomiser under high pressure to form a mist the average droplet si~e of which is not greater than 100 microns.
, .
Liquid plant sprays include fung~cides, insecticides, herbicides and the like but are not 20 necessarily limited thereto.
"High pressure" as used herein means pressure which is high enough to cause a plant spray pumped through an atomiser of orifice size betweesl .18 mm and .60 mm diameter to emerge as a mist having a droplet size of between ~ and 100 microns. An 25 atomiser with an orifice size of less than about .18 mm would probably be tooexpensive except for special purposes and equally a pump required to pump at a pressure high enough to produce droplets smaller ~han ~ microns would be too expensive to be commercially useful for ordinary plant spraying work. It is envisaged that the apparatus of the invendon will include a pump which will operate at a pressure 30 of about 130 bar but it is believed that, to be useful for ordinary plant spraying, the rninimum pressure at which the pump should be capable of operating under ordinary conditions should be about 120 bar. Under special conditions or for some purposes however, a purnp operadng as low as 60 bar and as high as about ~00 bar might still be useful for plant spraying.
. - - .. : .
-: : . . . .
:.. : . :
wo 90~ 05 pcrlAugoloolo2 The apparatus of the invention will thus operate without the use of an air stream to draw the liquid through the atomiser. Also, since the apparatus does not use air to en~rain the atomised spray. According to an important aspect of the invention the 5 apparatus includes a small bore flexible hose at least downstream of the pump. In one form the hose is of hose material such as nylon which induces an electrostatic charge in the spray. Any other suitable hose material having the same effect may of course be used and the hose may be reinforced to enable it to sustain the opera~ng pressure.
10 It is an important feature of the invention that droplets are formed which are subslantially smaller ~an the droplets formed by conventional sprayers. In one aspect of the invention the average size of the droplets produced is of the order of 5 to 60 microns. However, it might be useful for some purposes IO achieue an average droplet size of up to about 100 microns.
Another important feature of the apparatus is that it may comprise a wand or other distribution member having a number of atomisers, i.e. at least two bu~ even three or mose atorr~sers. This is made possible by the efflcient action of the rnist in enveloping the plants to which it is directed combined with the considerably reduced quantity of 20 plant spray which passes through each atomiser per unit time.
BRIEF DESCRI~IION OF THE DRAW~G
The invention is further discussed with refeIence to the accompanying line diagram, ~5 which by way of example, shows the aIrangement of components for making up a plant or crop spraying apparatus.
I)ESCRIPTION OF EMBODIM~IT OF l ~ INVE~TION
30 In the drawing the outlet of a tan~ 10 containing liquid fungicide or insecticide is connected by a low pressure pipe 12 to, for example, a triplex (i.e. three stage) plunge~
pump 14 driven by a directly connected petrol engine. The pump and engine may besupplied as a single unit and are not separately shown on the diagram. A high pressure pipe 16 connects the outlet of the pump 14 to a regulator valve 18 provided with a 35 pressure gauge 20 and a by-pass line 22 for returning excess liquid to the tank. The outlet of the regulator valve 18 is conneeted by a flexible, reinforced, high pressure .
' : , .. : .. : .............. .
Wo 9~/l0505 PCr/AlJ90/00l02 S~!J~
nylon hose 24 to a rigid wand or boom 26 provided with, in this case, ~hree liquid atomisers 28.
5 The tank 10 is a standard size tank of capacil~y to suit the size of the apparatus. Por example, if the apparatus is intended to be canied on the back of the user the tank may haYe a capacity as low as 10 litres. On the othe,r hand a tractor mounted apparatus may have a tank of 1500 litres capacity. It is irnpor~ant that the tank should not be too large since suspended materials in the liquid may have a tendency to settle if the liquid 10 remains in the tank for tOO long after the tank is filled or if the ~ank is not provided with an agitator.
Since the tank 10, the pump 14,and the regulator valve 18 are all fixed on a common frame (not shown) the pipes 12, 16 and 22 may be Iigid or flexible as desired.
~, ~5 The pump 14 in one ~vorking example is a SpeckTM pump, model ~NP 12-12-130.
This pump has a rated working pressure of 130 bar and the ou~put of this apparatus was about 3 litres per minute. Whatever pump is used it must of cours0 have a delivery capacity matched to the capabilities of the apparatus. The capaciy of the pump may ba 20 as low as 1 litre per minute for a back mounted apparatus and as high as 76 litres per minute for a tractor mounted apparatus.
The regulator valve in the samè working exarnple is also known per se, being a model ~Ul. 150, also marketed by Specl~. The pressure valve controls the pressure and rate 25 of delivery of the li~uid to the atornising nozzles.
The atomising nozzles may also be of commercially available type as used in airless paint spraying equipment. The nozzle size can be chosen to suit the characteristics of the liquid and the size of droplet required. The droplet size is detesmined at least in par~
30 by the diseæe or pest for which the plants are being spIayed. Ille orifice size of nozzles most commonly used in the present apparatus will probably be .28 mm ~o .~8 mm diarneter. ln apparatus using the above mentioned model of Speck pump operating at 130 b~r as measure:d on the pressure gauge the average droplet size of a mist produced by pumping a liquid insecticide through a wand with three nozzles of .38 mm orihce 35 size was determined to be 40 microns. Ihe test comprised passing a glass mic~oscope slide through the mist and determining the average size of the drople~s which adhered :. ~ . . :
WO 90/lO~;OS PCI/AU90/00102 2 ~ 2 ~
to the glass. r As already mentioned a hand held wand may comprise two, three or even more 5 atomising nozzles. On the other hand a tractor mounted boom may comprise as many as thirty five atomising, nozzles.
It is of considerable benefit if the atomisinc, nozzles are of tungsten carbide or other material which is resistant to the abrasion of solids suspended in the liquid. One 0 advantage of the apparatus is believed to be that such solids tend to be broken up as They pass through the high pressu~e filters with which such no771es are provided. Filters of this kind are comrnonly of stainless steel gauze and again a~e well hlown in airless paint spraying equipment.
1~ It is believed tha~ the use of a nylon hose in combination with the high pressure and velocity of the liquid through the hose imparts a static charge ~o the m~st drople~s which causes the droplets to be attracted by the plants at which the spray is directed. This ~educes wastage. Another factor which is believed to reduce wastage is that there is less tendency for the droplets to agglomerate in the air and, being so finely diYided, eddies 20 or swirls occur in the spray which increase the efficiency of the distribution of the droplets over the plants.
Yet another fac~or which may contribute to the efficiency of the apparatus, still associated with the small droplet size, is that the fine mist created by the sprayer causes 25 a sudden increase in humidity around the plant and also a rapid reduction in ~he humidity as the mist is dispersed. It is possible that this rapid change in humidity is beneficial ~or flowering and pollination.
Because of the efficiency of the distribution of the mist over the plants the time ta~en 30 to spray a given ~rop is very considerably reduced and moreover the qualltity of liquid used is considerably diminished.
It is not intended that the scope of a patent granted in pursuance of the ~pplica~ion of which this specifica~ion forms a part should exclude modifications and/or 35 improvements to the embodiments described and/or illustrated which are within the spirit of the invention as defined herein or be limited by details of such embodiments WO 90/10~0~ PCI/AV90/00102 2 ~ 6-:: further than is necess~ry to distinguish the invention frorn the prior 3rt.
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PLANT SPRAYING APPARATUS AND ME,THOD
FELD OF THE IN~ENTION
This invention rela~es to a spraying apparatus particularly but not necessarily exclusively for spraying plants with fungicide~ insecdcide and ~he like.
DESCRIPTION OF THE PRIOR ART
Conventional plant sprayers of one kind cornprise a rnotor driven centrifugal blower which blows air through a flexible pipe of relatively large bore (i.e. of the order of 50 mm diarneter). Liquid insecticide is led tO the flexible pipe through a feed pipe which is connected tO a tank for holding the insecticide. The insecticide is fed through the feed 13 pipe either by gravity, by putting the tank under the low air pressure generated by the blower, by ventun effect or by a combination of these. As the liquid enters the flexible pipe it forms into droplets which are entrained in the air strearn. Typically the size of the droplets emitted from a conventional plant sprayer is of the order of 250 to 400 rnicrons.
~0 It is a disadvantage of droplets of this size that thsre is a lot of wastage of the spray.
The reason for ~his is that when the droplets are deposited on the plant they have a marked tendency to coalesce into larger dsops which merely run off the plant under gsavity and are wasted.
Furthermore the conventional sprayers of the kind refelTed to above ase relatively slow in operation as ~e spray which they emit covers a rela~vely small area in each pass of the sprayer.
30 In another kind of plant sprayer large drops of the liql~id insecticide a~e dropped onto a spinning disc and become dissociated into droplets of small size. The output of spinning dise sprayers in however limiteL
, :
:.: : , ,,~, , .
. ,: ~ . - : i -, .. .
.
. , .. ~ ~. :
, . ~
WO 90/1~05 PCT'/AU91)~00102 2~ 2-OBJECT OF THE INVENTION
It is an object of the invention to provide a sprayer which dis~ibutes ~he spray over a 5 crop in a more cost-effective manner; or at least to offer the public the choice of a sprayer of novel design.
SUMMARY OF THE INVENTION
10 According to the invention plant spraying apparatus compIises at least one atomiser and means to pump liquid plant spray through the atomiser at high pressure, the atomiser being such that the plant spray pumped therethrough emerges as a rnist the average droplet size of which is not grea2er than 100 microns.
15 Further according to the invention a methcd of plant spraying includes the step of pumping a liquid plant spray through an atomiser under high pressure to form a mist the average droplet si~e of which is not greater than 100 microns.
, .
Liquid plant sprays include fung~cides, insecticides, herbicides and the like but are not 20 necessarily limited thereto.
"High pressure" as used herein means pressure which is high enough to cause a plant spray pumped through an atomiser of orifice size betweesl .18 mm and .60 mm diameter to emerge as a mist having a droplet size of between ~ and 100 microns. An 25 atomiser with an orifice size of less than about .18 mm would probably be tooexpensive except for special purposes and equally a pump required to pump at a pressure high enough to produce droplets smaller ~han ~ microns would be too expensive to be commercially useful for ordinary plant spraying work. It is envisaged that the apparatus of the invendon will include a pump which will operate at a pressure 30 of about 130 bar but it is believed that, to be useful for ordinary plant spraying, the rninimum pressure at which the pump should be capable of operating under ordinary conditions should be about 120 bar. Under special conditions or for some purposes however, a purnp operadng as low as 60 bar and as high as about ~00 bar might still be useful for plant spraying.
. - - .. : .
-: : . . . .
:.. : . :
wo 90~ 05 pcrlAugoloolo2 The apparatus of the invention will thus operate without the use of an air stream to draw the liquid through the atomiser. Also, since the apparatus does not use air to en~rain the atomised spray. According to an important aspect of the invention the 5 apparatus includes a small bore flexible hose at least downstream of the pump. In one form the hose is of hose material such as nylon which induces an electrostatic charge in the spray. Any other suitable hose material having the same effect may of course be used and the hose may be reinforced to enable it to sustain the opera~ng pressure.
10 It is an important feature of the invention that droplets are formed which are subslantially smaller ~an the droplets formed by conventional sprayers. In one aspect of the invention the average size of the droplets produced is of the order of 5 to 60 microns. However, it might be useful for some purposes IO achieue an average droplet size of up to about 100 microns.
Another important feature of the apparatus is that it may comprise a wand or other distribution member having a number of atomisers, i.e. at least two bu~ even three or mose atorr~sers. This is made possible by the efflcient action of the rnist in enveloping the plants to which it is directed combined with the considerably reduced quantity of 20 plant spray which passes through each atomiser per unit time.
BRIEF DESCRI~IION OF THE DRAW~G
The invention is further discussed with refeIence to the accompanying line diagram, ~5 which by way of example, shows the aIrangement of components for making up a plant or crop spraying apparatus.
I)ESCRIPTION OF EMBODIM~IT OF l ~ INVE~TION
30 In the drawing the outlet of a tan~ 10 containing liquid fungicide or insecticide is connected by a low pressure pipe 12 to, for example, a triplex (i.e. three stage) plunge~
pump 14 driven by a directly connected petrol engine. The pump and engine may besupplied as a single unit and are not separately shown on the diagram. A high pressure pipe 16 connects the outlet of the pump 14 to a regulator valve 18 provided with a 35 pressure gauge 20 and a by-pass line 22 for returning excess liquid to the tank. The outlet of the regulator valve 18 is conneeted by a flexible, reinforced, high pressure .
' : , .. : .. : .............. .
Wo 9~/l0505 PCr/AlJ90/00l02 S~!J~
nylon hose 24 to a rigid wand or boom 26 provided with, in this case, ~hree liquid atomisers 28.
5 The tank 10 is a standard size tank of capacil~y to suit the size of the apparatus. Por example, if the apparatus is intended to be canied on the back of the user the tank may haYe a capacity as low as 10 litres. On the othe,r hand a tractor mounted apparatus may have a tank of 1500 litres capacity. It is irnpor~ant that the tank should not be too large since suspended materials in the liquid may have a tendency to settle if the liquid 10 remains in the tank for tOO long after the tank is filled or if the ~ank is not provided with an agitator.
Since the tank 10, the pump 14,and the regulator valve 18 are all fixed on a common frame (not shown) the pipes 12, 16 and 22 may be Iigid or flexible as desired.
~, ~5 The pump 14 in one ~vorking example is a SpeckTM pump, model ~NP 12-12-130.
This pump has a rated working pressure of 130 bar and the ou~put of this apparatus was about 3 litres per minute. Whatever pump is used it must of cours0 have a delivery capacity matched to the capabilities of the apparatus. The capaciy of the pump may ba 20 as low as 1 litre per minute for a back mounted apparatus and as high as 76 litres per minute for a tractor mounted apparatus.
The regulator valve in the samè working exarnple is also known per se, being a model ~Ul. 150, also marketed by Specl~. The pressure valve controls the pressure and rate 25 of delivery of the li~uid to the atornising nozzles.
The atomising nozzles may also be of commercially available type as used in airless paint spraying equipment. The nozzle size can be chosen to suit the characteristics of the liquid and the size of droplet required. The droplet size is detesmined at least in par~
30 by the diseæe or pest for which the plants are being spIayed. Ille orifice size of nozzles most commonly used in the present apparatus will probably be .28 mm ~o .~8 mm diarneter. ln apparatus using the above mentioned model of Speck pump operating at 130 b~r as measure:d on the pressure gauge the average droplet size of a mist produced by pumping a liquid insecticide through a wand with three nozzles of .38 mm orihce 35 size was determined to be 40 microns. Ihe test comprised passing a glass mic~oscope slide through the mist and determining the average size of the drople~s which adhered :. ~ . . :
WO 90/lO~;OS PCI/AU90/00102 2 ~ 2 ~
to the glass. r As already mentioned a hand held wand may comprise two, three or even more 5 atomising nozzles. On the other hand a tractor mounted boom may comprise as many as thirty five atomising, nozzles.
It is of considerable benefit if the atomisinc, nozzles are of tungsten carbide or other material which is resistant to the abrasion of solids suspended in the liquid. One 0 advantage of the apparatus is believed to be that such solids tend to be broken up as They pass through the high pressu~e filters with which such no771es are provided. Filters of this kind are comrnonly of stainless steel gauze and again a~e well hlown in airless paint spraying equipment.
1~ It is believed tha~ the use of a nylon hose in combination with the high pressure and velocity of the liquid through the hose imparts a static charge ~o the m~st drople~s which causes the droplets to be attracted by the plants at which the spray is directed. This ~educes wastage. Another factor which is believed to reduce wastage is that there is less tendency for the droplets to agglomerate in the air and, being so finely diYided, eddies 20 or swirls occur in the spray which increase the efficiency of the distribution of the droplets over the plants.
Yet another fac~or which may contribute to the efficiency of the apparatus, still associated with the small droplet size, is that the fine mist created by the sprayer causes 25 a sudden increase in humidity around the plant and also a rapid reduction in ~he humidity as the mist is dispersed. It is possible that this rapid change in humidity is beneficial ~or flowering and pollination.
Because of the efficiency of the distribution of the mist over the plants the time ta~en 30 to spray a given ~rop is very considerably reduced and moreover the qualltity of liquid used is considerably diminished.
It is not intended that the scope of a patent granted in pursuance of the ~pplica~ion of which this specifica~ion forms a part should exclude modifications and/or 35 improvements to the embodiments described and/or illustrated which are within the spirit of the invention as defined herein or be limited by details of such embodiments WO 90/10~0~ PCI/AV90/00102 2 ~ 6-:: further than is necess~ry to distinguish the invention frorn the prior 3rt.
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'. IO
~' ` 15 2~) .
Claims
Claims 1.
Plant spraying apparatus comprising at least one atomiser (28) and means to pumpliquid plant spray through the atomiser at high pressure, the atomiser being such that the plant spray pumped therethrough emerges as a mist the average droplet size of which is not greater than 100 microns.
2.
Apparatus according to claim 1, including a pump (14) for pumping the liquid plant spray to the atomiser at a pressure of not less than 60 bar.
3.
Apparatus according to claim 1 or claim 2, including a pump (14) for pumping theliquid plant spray to the atomiser at a pressure of between 60 bar and 200 bar.
4.
Apparatus according to any one of claims 1 to 3, in which the average droplet size is between 5 and 60 microns.
5.
Apparatus according to any one of claims 1 to 4, in which the atomiser (28) has an orifice the diameter of which is between .18 mm and .60 mm.
6.
Apparatus according to any one of claims 1 to 5, in which the liquid plant spray is pumped to the atomiser through a pipe (24) which causes an electrostatic charge to be present in the mist.
7.
Apparatus according to any one of claims 1 to 6, including a rigid pipe (26) through which the liquid plant spray can be pumped to two or more said atomisers mountedthereon.
8.
A method of plant spraying includes the step of pumping a liquid plant spray through an atomiser (28) under high pressure to form a mist the average droplet size of which is not greater than 100 microns.
9.
A method according to claim 8, in which the liquid plant spray is pumped to the atomiser at a pressure of not less than 60 bar.
10.
A method according to claim 8 or claim 9, in which the liquid plant spray is pumped to the atomiser at a pressure of between 60 bar and 200 bar.
11.
A method according to any one of claims 8 to 10, in which the average droplet size is between 5 and 60 microns.
12.
A method according to any one of claims 8 to 11, in which the atomiser has an orifice the diameter of which is between .18 mm and .60 mm.
13.
A method according to any one of claims 8 to 12, in which the liquid plant spray is pumped to the atomiser through a pipe (24) which causes an electrostatic charge to be present in the mist.
Plant spraying apparatus comprising at least one atomiser (28) and means to pumpliquid plant spray through the atomiser at high pressure, the atomiser being such that the plant spray pumped therethrough emerges as a mist the average droplet size of which is not greater than 100 microns.
2.
Apparatus according to claim 1, including a pump (14) for pumping the liquid plant spray to the atomiser at a pressure of not less than 60 bar.
3.
Apparatus according to claim 1 or claim 2, including a pump (14) for pumping theliquid plant spray to the atomiser at a pressure of between 60 bar and 200 bar.
4.
Apparatus according to any one of claims 1 to 3, in which the average droplet size is between 5 and 60 microns.
5.
Apparatus according to any one of claims 1 to 4, in which the atomiser (28) has an orifice the diameter of which is between .18 mm and .60 mm.
6.
Apparatus according to any one of claims 1 to 5, in which the liquid plant spray is pumped to the atomiser through a pipe (24) which causes an electrostatic charge to be present in the mist.
7.
Apparatus according to any one of claims 1 to 6, including a rigid pipe (26) through which the liquid plant spray can be pumped to two or more said atomisers mountedthereon.
8.
A method of plant spraying includes the step of pumping a liquid plant spray through an atomiser (28) under high pressure to form a mist the average droplet size of which is not greater than 100 microns.
9.
A method according to claim 8, in which the liquid plant spray is pumped to the atomiser at a pressure of not less than 60 bar.
10.
A method according to claim 8 or claim 9, in which the liquid plant spray is pumped to the atomiser at a pressure of between 60 bar and 200 bar.
11.
A method according to any one of claims 8 to 10, in which the average droplet size is between 5 and 60 microns.
12.
A method according to any one of claims 8 to 11, in which the atomiser has an orifice the diameter of which is between .18 mm and .60 mm.
13.
A method according to any one of claims 8 to 12, in which the liquid plant spray is pumped to the atomiser through a pipe (24) which causes an electrostatic charge to be present in the mist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ22609389 | 1989-03-09 | ||
| NZ226,093 | 1989-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2049026A1 true CA2049026A1 (en) | 1990-09-10 |
Family
ID=19922582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2049026 Abandoned CA2049026A1 (en) | 1989-03-09 | 1990-03-09 | Plant spraying apparatus and method |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0474635A4 (en) |
| JP (1) | JPH04506472A (en) |
| AU (1) | AU5276890A (en) |
| CA (1) | CA2049026A1 (en) |
| WO (1) | WO1990010505A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2877098B2 (en) * | 1995-12-28 | 1999-03-31 | 株式会社日立製作所 | Gas turbines, combined cycle plants and compressors |
| ES2196577T3 (en) * | 1997-07-04 | 2003-12-16 | Univ Southampton | INSECTICIDES THAT CAN IMPROVE THE PERFORMANCE AS DIANS OF FLYING INSECTS, AND LIQUID LOADING APPARATUS. |
| GB2327587A (en) * | 1997-07-29 | 1999-02-03 | Geismar | High pressure vehicular mounted weed spraying system |
| CN103478109B (en) * | 2013-09-12 | 2015-02-11 | 北京农业信息技术研究中心 | Device and method for generating quantitative-diameter of pesticide spraying droplets |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE607001C (en) * | 1932-04-07 | 1935-10-05 | Robert Bosch Akt Ges | Method and device for atomizing paints, varnishes or the like. |
| US4039144A (en) * | 1972-03-01 | 1977-08-02 | Mee Industries, Inc. | Environmental control method and apparatus |
| SE390827C (en) * | 1976-03-22 | 1980-08-11 | Astra Dinol Ab | PROCEDURE FOR APPLICATION OF AN ANTI-PROTECTIVE EQUIPMENT IN RIGHT SAVEL AS A CROCKET HALL ROOM MEDIUM SPRAYING |
| US4202357A (en) * | 1978-10-27 | 1980-05-13 | Philip Morris Incorporated | Reordering expanded tobacco by water mist |
| NL187729C (en) * | 1980-01-04 | 1992-01-02 | Icab Ind Coating Ab | ELECTROSTATIC POWDER SYRINGE. |
| US4278711A (en) * | 1980-01-14 | 1981-07-14 | Ball Corporation | Apparatus and method for the lubrication of cans |
-
1990
- 1990-03-09 EP EP19900904732 patent/EP0474635A4/en not_active Withdrawn
- 1990-03-09 JP JP50470590A patent/JPH04506472A/en active Pending
- 1990-03-09 WO PCT/AU1990/000102 patent/WO1990010505A1/en not_active Application Discontinuation
- 1990-03-09 AU AU52768/90A patent/AU5276890A/en not_active Abandoned
- 1990-03-09 CA CA 2049026 patent/CA2049026A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990010505A1 (en) | 1990-09-20 |
| JPH04506472A (en) | 1992-11-12 |
| AU5276890A (en) | 1990-10-09 |
| EP0474635A4 (en) | 1992-03-25 |
| EP0474635A1 (en) | 1992-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |