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The first generation of paddy husker

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Joined: 2018-06-06
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*Posted: Submitted by ricepolisher (0) on Tue, 2018-06-12 02:02. | Subject: The first generation of paddy husker

The first generation of paddy husker
were adapted from whitening machines. They featured a similar vertical
cone design but had two basic differences. The first was that the cone
was made of a simplified steel wire construction and covered with wood,
on to which leather strips were nailed. The second was that the cone
rotated at a speed that was 25 percent slower than the vertical cone
design.

The process from dried paddy to white rice divided into
several stages: separation, husking and whitening. The separation
carried out before and after the husking process, and this operation
also done after whitening to obtain a good quality of white rice.

Mature
seeds were dehusked with a rice husker and were surface sterilized in
2.5% sodium hypochlorite for 30 min with gentle mixing. The seeds were
washed five times in water and then incubated overnight in water at room
temperature. About 30 mature seeds were placed on filter papers in a
Petri dish and soaked with 10 ml of water and the plate was then sealed
with surgical tape. After germination, the rice seedlings were incubated
in the biotron for 7 d. The 7-day-old rice seedlings were transferred
to individual disposable plastic pots filled with 150 ml of rice nursery
culture soil. Each plant was restricted to the main culm by the removal
of tillers. Twenty plant pots were put in a plastic tray and placed in
the biotron. Water was supplied to the plant until the soil was covered.
Additional fertilizer was not supplied.

Tavakoli et al. (2002)
reported that the most appropriate clearance between the rubber rollers
for a laboratory husker for three varieties of Binam, Khazar and
Sepidroud was ranged from 0.45 to 0.65 mm. Payman et al. (1999)
determined the most suitable spacing between rubber rolls for increasing
husking percentage and reducing rice breakage in the test huller.
Alizadeh and Payman (2004) reported that use of blade-type rice whitener
as a huller in milling process increased rice breakage in comparison
with rubber roll husker. Shitanda et al. (2001) studied the Performance
of experimental impeller and rubber roller huskers using three different
varieties of paddy. Results of their study showed that Rubber roll
husker had high husking energy efficiency compared to the impeller
husker.

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