Available modern rice processing machines include: Paddy Cleaner-This machine separates all the impurities like straw, dust, sand, and stones, etc., from paddy, where a blower is attached to the machine for proper cleaning; Paddy Husker-This machine is used for dehusking or shelling process. This machine is also called a Paddy Sheller. Rice Polishing Machine(RPM) or commonly known as the rice polisher is one of the newly developed rice processing machines used in rice processing industry. This machine was designed to make the milled rice more attractive in appearance and also to improve the packing properties as well as to remove the final traces of dust, bran, and flour from rice surface.

A pneumatic rice polishing system, based on jet-polishing technique of metal surface, has been developed to minimize broken. This consists of 5 cm diameter polythene pipe; inner surface is lined with hard abrasive material, a blower and a collection system, and no moving part. Brown rice and air are fed through 180° scroll and flow through abrasive pipe. The system used 28.2 m s airflow, 0.45 kg feed rate and different pipe lengths (1.0–4.0 m; interval 0.5 m). Degree of polish and broken varied with both pipe length (L) and number of passes (N; 5–50). System showed uniform polishing, and degree of polish (Dp) varied from 3.72% (1 m) to 9.97% (4 m), and linearly with N. 8.52% broken was obtained (4 m pipe) while laboratory abrasive polisher yielded 20% at equal Dp level. Effects of N and L and their interactions were found significant (p < 0.05) on Dp.

A major occupational hazard for workers in rice mills is the noise during the operation of various machines. In India, noise in the workrooms of industries is considered as a part of the routine and inescapable industrial work environment. Moreover, no industrial law in India provides any protection to workers from noise pollution. Section 11 (I) of the Factories Act, 1948 stipulates that every factory shall be kept clean, without having any nuisance. The word "nuisance" includes noise, but statutory provisions in industrial law to provide this protection are overdue. Due to this, agro industries do not give much importance to the exposure of workers to high-intensity noise and the adoption of suitable measures for its control. Noise is one of the common occupational hazards and there is evidence to support the increasing prevalence of high noise levels in the workplace. Therefore, one of the major safety concerns has been the exposure of high intensity of noise to the workers.

It is proven fact that exposure to organic dust have high prevalence of respiratory diseases, such as asthma, chronic bronchitis, extrinsic allergic alveoli ties, toxic syndrome, and interstitial lung. These occupational diseases depend up on the dust concentration and duration of exposure apart from variation in personal immunity. The Swedish National Board of Occupational Safety and Health has prescribed the dust exposure limit of 10 mg/m3 and 5 mg/m3 for normal and organic dust, respectively. Many studies have demonstrated and concluded that occupational diseases constitute serious health and economic problems to the nations. Occupational hygienists must look at the working environment. Several reports have suggested that unprotected dust exposures in agricultural work stations may lead to pulmonary fibrosis.

The method of partial budgeting was used for economic comparison of two types of paddy separator. Results showed that performance of the tray type paddy separator was better than compartment type in three evaluated paddy varieties. There was a significant difference between the paddy separators from the viewpoint of percentage of paddy and brown rice. Tray type separator had more percentage of paddy (76.03%) and brown rice (99.89%) compared to compartment type paddy separator with 28.32% and 99.5% of percentage of paddy and brown rice, respectively. Furthermore, rice breakage of tray type separator (18.34%) was significantly less than that of compartment type (21.75%).

If you want to know more information, please visit this website: http://www.china-zjlg.com/product/polishing-machine/