Horizontal Emery Roller Rice Whitener

Horizontal Emery Roller Rice Whitener - Achieving Desired Whiteness and Finish

Refining Brown Rice to Consumer-Grade White Rice
The Horizontal Emery Roller Rice Whitener is a core machine in the rice milling line, responsible for removing the bran layers (pericarp, seed coat, aleurone) from brown rice to produce white rice with the desired degree of whiteness, surface finish, and minimal broken grains. Shijiazhuang Xinlu Technology Co., Ltd. produces horizontal whitener designs known for their efficiency and control.

Working Mechanism: Brown rice enters the machine's horizontal milling chamber. Inside, one or more cylindrical rollers, coated with abrasive emery (silicon carbide or aluminum oxide grit), rotate at high speed. The rice is fed axially along the length of the roller(s). Surrounding the roller is a cylindrical screen (wire mesh or perforated sheet steel). The space between the roller and the screen forms the milling chamber. As the roller rotates, it propels the rice grains against the inner screen surface. The abrasive action of the emery grit on the roller, combined with the friction between grains and against the screen, gradually scrubs off the bran layers. A controlled flow of air is introduced, typically through the screen or the shaft, to cool the rice (preventing overheating and moisture loss which causes breakage) and carry away the bran powder. Pressure is applied at the outlet, often via a pneumatic or weighted lever system acting on a cone choke, to control the residence time and milling intensity.

Design Features & Control: Emery Roller Configuration: Single or double roller designs; roller grit size and pattern influence bran removal rate and kernel surface smoothness. Milling Chamber Screen: Screen aperture size and open area percentage affect bran removal efficiency and resistance to clogging. Pressure Control System: Precise adjustment of the outlet pressure (choke) is paramount for controlling the degree of whitening and minimizing breakage. Air Flow System: Adequate and adjustable air volume is critical for cooling and bran evacuation. Horizontal Shaft Design: Offers advantages in gravity flow and potentially lower power consumption per unit capacity compared to some vertical designs, and often allows easier access for maintenance.

Critical Operational Parameters: Outlet Pressure: The single most crucial setting, directly controlling milling intensity, whiteness degree, temperature rise, and breakage percentage. Feed Rate: Must be consistent and matched to machine capacity; fluctuations cause inconsistent whitening and increased breakage. Roller Speed: Affects the impact force and abrasion intensity. Air Volume & Pressure: Essential for cooling and maintaining bran flow; insufficient air leads to overheating, moisture loss, and screen clogging. Rice Variety & Condition: Kernel size, hardness, initial moisture content, and bran layer characteristics all influence optimal settings.

Impact on Final Product: The whitener directly determines key consumer attributes: Whiteness Degree: How much bran is removed. Milling Degree: Surface finish and polish. Broken Rice Percentage: Minimizing breakage is economically vital. Temperature Rise: Excessive heat damages starch, affecting cooking quality and shelf life. Bran Removal Efficiency: Impacts the quality and quantity of the valuable bran by-product. Achieving the target whiteness with minimal breakage and kernel temperature rise is the hallmark of a well-operated whitener.

Shijiazhuang Xinlu Technology Co., Ltd. focuses on constructing Horizontal Emery Roller Rice Whiteners with precise control mechanisms, durable emery coatings, efficient cooling systems, and robust construction to deliver consistent whitening results while protecting valuable head rice yield.