Coffee bean vibrating screen

Coffee beans are the raw material for making coffee. A Coffee bean vibrating screen can effectively remove impurities from coffee beans or grade them to achieve a purer particle size, facilitating subsequent grinding and brewing. Commonly used equipment can sieve coffee beans ranging from 4.8 mm to 8.0 mm, corresponding to screen sizes of Screen 12 to Screen 20. Depending on the required coffee bean production volume, the screen can sieve approximately 0.1 to 15 tons of coffee beans per hour. The equipment is typically made of stainless steel to maintain the cleanliness of the coffee beans.

The Sieving Process of a Coffee Bean Vibrating Screen

When sieving with a coffee bean vibrating screen, the coffee beans to be sieved are first evenly poured into the feed inlet of the screen. The coffee beans will be repeatedly tossed up and down by the vibration of the screen surface, slowly moving along the screen surface towards the discharge end. The screens in the sieving machine are arranged in layers from top to bottom according to their aperture size. The upper coarse screen first blocks large particles and unhulled beans, which are discharged from the side outlet. Coffee beans of the correct size can pass through the upper screen and fall onto the lower fine screen. The fine screen removes broken beans, fine powder, and other small impurities. Finally, coffee beans that meet the particle size standard are collected from the fine screen outlet.

International Common Coffee Bean Sieve Grading Table

Benefits of a Coffee Bean Vibrating Screen

A coffee bean vibrating screen offers benefits such as screening, cleaning, and grading. During the harvesting and drying process, green coffee beans may be mixed with impurities such as sand and broken bean husks. The equipment can separate these impurities from the coffee beans, preventing them from affecting subsequent processing. The vibrating screen can grade coffee beans according to their particle size based on the preset screen aperture, ensuring that beans roasted in the same batch are of uniform size, heated for the same time and degree, achieving uniform roasting. Coffee beans of different sizes and plumpness have different uses. Vibrating screens, by changing the mesh size of the sieves, separate coffee beans into multiple grades, enabling graded sales and enhancing the commercial value of the raw coffee.

Coffee Bean Vibrating Screen Parameter Table

Application Scenarios of Coffee Bean Vibrating Screens

Coffee bean vibrating screens can be used in green bean pre-processing, roasting, finished product packaging, and batch screening.

During green bean processing, a linear vibrating screen or 1-5 layers of sieves can be used to remove impurities such as dirt, twigs, and bean husks, while also initially grading the green beans by size. Before roasting, using a coffee bean vibrating screen removes any impurities and broken beans that slip through the sieve, ensuring uniform size of the green beans entering the roaster and preventing uneven roasting. After roasting, the equipment can remove burnt residue, bean husks, and fine powder, preventing these residues from mixing into the finished beans and affecting their taste and appearance. In coffee processing plants, equipment allows for large-scale, continuous screening of coffee beans, thereby increasing production speed.

After harvesting, processing, drying, and roasting, coffee beans become grindable and brewable. The different flavor characteristics of coffee, such as acidity, sweetness, bitterness, and aroma, make coffee tasting a unique and enjoyable experience. Coffee bean vibrating screens provide an excellent screening solution for coffee bean production.