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Sesame has small particles, smooth surface, and high oil content. Its impurities are complex and come from various sources. They run through the entire process of harvesting, drying, transportation, and storage, and can be roughly divided into the following categories.

Mexico is a major global producer and consumer of corn, which serves as its primary staple food. According to data from the U.S. Department of Agriculture (USDA), Mexico’s corn production for the 2025/26 marketing year is projected at approximately 25.3 million metric tons—an increase of about 10% over the previous year—with a harvested area of roughly 6.7 million hectares, up 3% year-on-year. This growth is largely driven by recovering reservoir levels and improved weather conditions; notably, the state of Sinaloa is seeing a gradual recovery following two consecutive years of drought. For the 2024/25 marketing year, production is estimated at approximately 25 million metric tons, with a harvested area of about 6.4 million hectares. Mexico’s corn cultivation follows two main seasonal cycles—spring/summer and autumn/winter—across regions including Jalisco, Guanajuato, and Michoacán (in the Bajío area), as well as the states of Mexico, Puebla, and Chihuahua. The crop consists primarily of white corn, which is used to meet domestic demand for both food and animal feed. Despite the recovery in production, output remains about 3% below the five-year average; coupled with robust domestic consumption, this ensures that Mexico’s corn imports remain substantial.

Nigeria is one of the world’s major sesame-producing countries. Its sesame seeds are renowned for their high oil content and excellent whiteness; however, the harvesting and drying processes are often rudimentary, leading to the presence of impurities—such as sand, soil, straw, dust, shriveled seeds, and discolored weed seeds—within the raw product. These contaminants directly compromise the purity required for export and negatively affect the quality of subsequent oil extraction. In this context, air-screen cleaners and destoners serve as two critical, interconnected pieces of equipment within the overall cleaning production line.

Although the same gravity separator and operating principle are used for both soybeans and sesame seeds, there are systemic differences ranging from feeding and separation parameters to the structural design of the equipment. These differences stem from the starkly contrasting physical properties of the two materials: soybeans feature large, heavy, and dense kernels with relatively abrasion-resistant seed coats, whereas sesame seeds are extremely small—with a thousand-kernel weight of only 2–4 grams—and possess a high oil content (around 50%), thin and fragile seed coats, and smooth, slippery surfaces. These characteristics dictate that the gravity separator must operate under completely different conditions when processing each material.

The soil separator—also known as a magnetic separator or clay-clod separator—is specialized equipment designed to complement air-screen cleaners and gravity destoners in grain and legume processing lines. It is primarily used for processing raw materials with high soil content or clay clods. Typically positioned after air-screen cleaning and before gravity destoning (or in the final processing stage following the gravity separator), it specifically targets and removes magnetic clay clods that are difficult for standard cleaning equipment to eliminate. Widely used in the processing of crops such as soybeans, kidney beans, pinto beans, peanuts, corn, sorghum, chia seeds, and rice, it serves as a key optional component for enhancing the purity of export-grade coarse grains and legumes.

Honduras is the most important Arabica coffee producer in Central America and a major global coffee exporter, consistently ranking among the world's top five coffee producers and top four Arabica exporters.