duster


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duster

a cloth used for dusting furniture, etc.

Duster

 

a machine or device for applying powdered dry pesticides to crops to protect them against pests and disease. Tractor-mounted or knapsack manual dusters are used, depending on conditions.

Tractor-mounted dusters are used to dust field crops, orchards, vineyards, and forest tracts. The working members are driven by a power takeoff shaft from the tractor engine. The operating width depends on the design of the duster; for vineyards it covers two to four rows, and for field crops, 10–100 m. Rated performance is from 3.5–5.0 to 30–64 hectares per hour.

Table 1. Main drying oils and their uses
1 mixture of polymerized and dehydrated oils is used *White spirit is the solvent ‘Content of alkyd resin, which has a fat content of 59–65%
NameType of oilProcessing methodOil content (percent)Uses
Natural.............DryingPartial polymerization100Preparation of primers, putty, oil paints (concentrated and thinned to working consistency); treatment of wood surfaces and other porous materials
Compound...........Drying or semidryingPolymerization and dehydration170–732Preparation of concentrated oil paints
Seminatural (for example, oxole) ............Drying orsemidryingPolymerization50–552Dilution of concentrated oil paints to working consistency
Alkyd (glyptal, pentaglyptal).Drying502,3Preparation of oil paints (concentrated and thinned to working consistency)

Knapsack dusters are used to treat vineyards, young fruit plantings, berry patches, vegetable fields, and other crops on small and inaccessible plots. The main units of such a duster are a tank with a feed device, a fan with a drive handle, and a tube with a spray nozzle. It has shoulder straps for carrying. Some knapsack dusters have a bellows instead of a fan for spraying the pesticide.

All dusters have the same principle of operation. The powder is fed from the bin or tank into a mixing chamber, and then it is forced by a stream of air created by the fan or bellows through the spray nozzle and out onto the plants.

G. P. SHAMAEV

References in periodicals archive ?
Renault India, a subsidiary of Renault SA (EURONEXT: RNO), has reduced the price of its Duster SUV in India.
Costing from PS9,495, the Duster is about the least expensive SUV on the market - but it is far from cheap and nasty.
Techspray Vortex 360[degrees] Renew Duster from Intertronics is formulated with 100% HFO-1234ze, which has a GWP of 6, compared to many existing products based on HFC-134a having a GWP of 1,300.
The gold clutch handbag with solid knuckle duster style handle was not allowed to be taken on to a flight leaving the airport yesterday morning.
With more than one million cars sold, the big-selling Duster has been revised and updated seven successful years after the model was first released by Renault, its parent firm.
Une ruse deja utilisee par son predecesseur avec moins de bonheur, ses ouvrants s'integrant moins harmonieusement avec les ailes avant bodybuildees que sur le nouveau Duster.
Starting at KD 4,200, the Renault Duster offer includes a ten-year warranty or 500,000 km plus free registration and 3 rd party insurance.
The Duster Laureate model is one of the more expensive versions - but it is still yours for a shade under PS16,000.
She paid for all the items she got from the store but forgot about the duster hanging over her shoulder.
20pm on August 27 of the accused inside the Marine Hotel in Ballycastle, Co Antrim, wearing the knuckle duster.
The Dacia Duster range comprises carefully profiled 18-models of 4x2 and Nissan-engineered 4x4 models in four trim levels with choice of 110bhp diesel or petrol engines developing 115 or 125bhp and priced between PS9,500 and PS16,500.
One of the reasons they've become available is because the Duster received a subtle update in looks and kit, as well as engine changes in 2015, and loyal owners have opted to switch to the tweaked model.