Coffee Beans Cleaning Solution

一、What problems might be encountered in the cleaning and processing of coffee beans?

The impurities in coffee bean raw materials are diverse and mainly fall into three categories: foreign objects, plant residues, and defective beans. During the field cultivation and outdoor drying stages, coffee beans are prone to be mixed with hard impurities such as sand, stones, and mud, as well as light plant debris such as dead branches, leaves, fruit peel and pulp residues, and grass clippings.

Compared to external impurities, the defective beans hidden in the bean pile are more harmful and are also the most difficult to remove. They include moldy and rotten beans that have been damp, underdeveloped and unripe beans, and broken and fragmented residual beans. These defective beans are mixed with high-quality beans and are difficult to be quickly distinguished by the naked eye.

Therefore, accurately cleaning various impurities and removing defective and bad beans is the first key line of defense to safeguard the quality of coffee bean raw materials and create high-quality coffee beans.

1、Cleaning machine operation-related issues.

● Insufficient screening and classification:

Improper selection of screen mesh size, unreasonable inclination angle of the screen surface, and inappropriate vibration frequency all contribute to the leakage of large impurities, incomplete cleaning of small impurities, and failure to separate good beans from crushed beans and grass seeds. Insufficient screening and classification.

● Equipment blockage, material clogging:

The long stalks of straw got entangled in the feed inlet, the screen, and the hopper of the elevator; the damp coffee beans stuck to the inner walls of the equipment and the pipelines, causing poor material discharge and machine blockages, which required frequent shutdowns for cleaning.

2、Quality and mold/pest infestation issues

●  Mold spots and rotten beans are difficult to remove:

The naked eye and ordinary screening methods cannot accurately distinguish slightly moldy or internally infested coffee beans. If these are mixed into the finished product, they will affect storage and food safety.

●  Fungal growth and spoilage:

Due to the accumulation of materials during processing with poor ventilation and excessive moisture content, the coffee beans that have accumulated will heat up, resulting in rapid moisture absorption, mold growth, and color changes within a short period of time.

3、Problems related to processes and production operations

● Inconsistent feed volume:

Fluctuating between excessive and insufficient. When the equipment is overloaded, the sorting accuracy significantly decreases; too little feed results in waste of production capacity and low cleaning efficiency.

● The process sequence is unreasonable:

The order of initial cleaning, wind selection, screening, stone removal, and classification is incorrect. The fine processing is carried out after the initial cleaning, which results in a large amount of impurities wearing down the equipment and increasing the wear of the screen mesh.

What cleaning machine do coffee beans importers usually use?

To remove impurities such as stalks, shredded leaves, soil clumps, stones, and moldy beans from coffee beans, importers generally adopt a multi-stage combined approach of "pre cleaning → stone removal → magnetic separation → specific gravity measurement → polishing → grading → color sorting → dust removal".The main machine includes the following categories:

1、 Coffee beans Air Screen Cleaner

Function: Can remove large particles (such as straw, leaves, etc.), small particles (such as weed seeds) and light impurities (such as dust, empty shells).

2、 Coffee beans Gravity De-stoner

Function:  It can remove small stones similar in size and weight to coffee beans.

3、 Coffee beans Gravity Separator

Function: Remove unripe coffee beans, infested coffee beans and moldy coffee beans kernels.

4、 Coffee beans Polishing machine

Function: Clean the dust, mud spots and loose soil off the surface of the coffee beans to ensure they have a uniform, smooth and shiny color.

5、 Coffee beans Color Sorter

Function: It can quickly detect color changes, mold, glass and plastic impurities in coffee beans and precisely remove them.

6、 Coffee beans Dust System

Function: It can remove light impurities and dust; prevent the workshop from being contaminated and prevent dust from adhering to the surface of coffee beans.

7、 Coffee beans Packaging Scale

Function:  Automatic weighing (10–50 kg/bag), bag sewing / heat sealing.

How can the purity of coffee beans be improved through the use of cleaning machine?

After the raw coffee beans are harvested and processed, there are numerous hard impurities, defective and damaged beans, etc. that are mixed in. Only manual screening is inefficient and inaccurate, making it difficult to completely purify the raw materials. By relying on a complete set of professional cleaning equipment and through multi-stage layered screening and precise impurity removal, various impurities can be completely removed, significantly improving the purity of the coffee bean raw materials, and ensuring the quality and processing safety of coffee from the source.

1、 Coffee beans Pre-cleaner:Remove large impurities

The first step of the pre-treatment process involves removing large pieces of coffee shells, large soil clumps, and large debris to reduce the burden on the subsequent equipment, prevent machine blockages, and lay the foundation for thorough cleaning.

2、 Coffee beans air screen cleaner:Remove large and small impurities, as well as light impurities.

The coffee beans air screen cleaner removes light impurities, bean shells, dust, small impurities, broken beans and shriveled beans through air separation and screening, initially improving the cleanliness..

3、 Coffee beans Gravity de-stoner:Remove the Stones from coffee beans

The coffee bean destoner is specifically designed to remove stones that are stuck together and cannot be removed by the air sieve. This significantly reduces the stone content and improves the purity for edible use.

4、 Coffee beans Gravity Separator:Remove substandard and damaged coffee beans.

Based on the differences in the fullness and density of the coffee beans, they are classified. At the same time, the shriveled, infested and damaged coffee beans are removed.

5、 Coffee beans Magnetic Separator:Removing Clods of Soil from coffee beans

The coffee beans magnetic separator uses magnetic force to remove soil and soil clumps. It is mainly used to remove soil from coffee beans.

6、 Coffee beans Color Sorter:Precisely removes moldy, blackened, and discolored coffee beans.

The coffee beans color sorting machine remove moldy coffee beans , discolored coffee beans , impure coffee beans  of different colors, and coffee beans of different varieties. Ensure that the products meet the national standards with high purity and no damaged coffee beans .

7、 Coffee beans grading machine

The coffee bean grading machine sorts the coffee beans by particle size, separating large particles, normal particles, small particles, and broken pods.

From raw coffee beans to finished refined coffee beans, various levels of impurities are removed step by step. The major impurities are cleared first, then light impurities are removed by air, heavy impurities are removed by sieving, irregular grains are sorted, and damaged grains are selected. The purity gradually increases.

二、What technical problems exist in the coffee beans cleaning production line?

1、Insufficient accuracy in the initial purification and classification process

Wind selection / Initial cleaning efficiency is low: Light impurities (dead leaves, fruit peels, grass debris) are not completely separated from the bad beans; improper matching of air volume may cause good beans to be blown away or impurities to be missed.

Wet beans have high viscosity and their sieve holes are prone to being clogged by pectin and fine mud; after the sieve is worn out, there will be leakage of beans, mixed grades, and an increase in the rate of broken beans.

2、Uneven drying and the challenge of moisture control

Drying rate imbalance: The surface is dry while the interior is wet (dry on the outside and damp on the inside), or some areas become overly dry and crack; uneven moisture distribution (variance of 10–13%), making storage prone to mold growth and flavor deterioration.

3、Equipment maintenance and reliability issues

Short lifespan of wear-prone components: The stripping disc, screen mesh, bearings, and seals wear out rapidly in wet, sticky, and abrasive environments, resulting in frequent gap drift, leakage, and abnormal noises.

Regarding these issues, how should we design a coffee beans cleaning solution?

In response to the problems of difficult separation of impurities and unstable purity in coffee beans raw materials, we have designed a complete cleaning production line equipment. Through processes such as "pre-treatment → rough cleaning → fine cleaning → classification → polishing → color sorting", along with intelligent debugging and interlocking control, we achieve a closed-loop cleaning process throughout the entire process, and solve various pain points one by one.

Each process is designed specifically to address the corresponding technical issues.

(1) Coffee beans pre-cleaner —Raw material pre-treatment

Function:

✅ Customize the screen mesh according to the particle size of coffee beans. Dynamically filter out dust, crushed beans, weed seeds and large pieces of dead branches and debris, while avoiding clogging of the screen mesh.

(2) Coffee beans air screen cleaner —Solve the problems of blocked nets, residual fine and coarse materials, and imbalance of air volume.

Capacity:5-10 Tons per hour

Purity: 99%

Function:

✅ By combining air selection with screening, large impurities, small impurities, light impurities and dust in the coffee beans are removed.

Advantages:

✅ Multifunctional impurity removal：It integrates vibrating screening and air separation functions, allowing one piece of equipment to simultaneously complete the separation of various impurities.

✅ Low material damage rate： Adopting flexible vibration and gentle material conveying design, the material flows smoothly without strong compression or violent collisions.

✅ High versatility, multiple functions in one machine:After replacing the screen mesh and adjusting the air volume parameters, it can be compatible for the separation of crops such as coffee beans and soybeans, suitable for importers of various types of coffee beans, and the equipment utilization rate is high.

(3) Coffee beans destoner —Remove the stones from the coffee beans.

Capacity:5-10 Tons per hour

Purity: 99%

Function:

✅ By adjusting the vibration frequency and air volume, the stones in the coffee beans can be removed.

Advantages:

✅ Food-grade stainless steel material：Stainless steel woven countertop, which can directly come into contact with food.

✅ High quality motor:for coffee beans cleaning machine, high quality Japan bearing.

✅ Highly adjustable： accommodating diverse material types and specifications.

(4) Coffee beans Gravity Separator  —Remove the stones from the coffee beans.

Capacity:5-10 Tons per hour

Purity: 99%

Function:

✅ The gravity separator can effectively remove diseased coffee beans, damaged coffee beans, rotten coffee beans, deteriorated coffee beans, moldy coffee beans and ineffective coffee beans from coffee beans.

Advantages:

✅ Precisely sorted according to the proportion：By using differences in density and bulk density for separation, it is easy to distinguish: full and good coffee beans, shriveled coffee beans, insect-infested coffee beans, and moldy coffee beans..

✅ Adopting a design with anti-clogging screens： for coffee beans cleaning machine, high quality Japan bearing.

✅ Highly adjustable： One machine can be used for various types of coffee beans.

(5) Coffee beans Magnetic separator  —Remove the clods from the coffee beans.

Capacity:5-10 Tons per hour

Purity: 99%

Function:

✅ The Magnetic separator can remove all metals or clods and soils from coffee beans.

Advantages:

✅ Stainless steel surface :  Used for food processing

✅ Low speed no broken bucket elevator:  Transports coffee beans to the magnetic separator without any damage occurring during the process.

✅ Advanced frequency converter: Can adjust the vibration frequency according to different materials to achieve the best results.

(6) Coffee beans grading machine  — separate the coffee beans to different size.

Capacity:5-10 Tons per hour

Function:

✅ Vibration Grader for removing the the big & small impurities or separate different size for coffee beans.

Advantages:

✅  Simple operation: Replaceable screen mesh allows for adaptation to different material classification requirements

✅ Surface undergoes sandblasting treatment: Prevents rusting and moisture absorption.

✅ Advanced frequency converter: Can adjust the vibration frequency according to different materials to achieve the best results.

(7) Coffee beans polishing machine  —Polish the surface of the coffee beans.

Capacity:5-10 Tons per hour

Function:

✅ Clean the dust, mud spots and loose soil off the surface of the coffee beans to ensure they have a uniform, smooth and shiny color.

Advantages:

✅  Excellent polishing results: The polishing cloth is made of pure cotton fabric and features good adsorption properties, thereby enhancing the polishing effect.

✅ Durable and with a long service life: The outer cylinder is made of 304 stainless steel mesh, which has excellent durability.

✅ Protect the Environment: The entire polishing chamber operates under a suction negative pressure condition. The generated dust can be promptly removed, preventing the accumulation of dust which could affect the polishing effect.      .

(8) Coffee beans color sorter  — Detect and remove moldy coffee beans, discolored coffee beans particles, as well as foreign objects such as glass.

Function:

✅ coffee beans color sorter relies on high-speed image acquisition, intelligent recognition and jet removal principles. By taking advantage of the differences in color, hue, defects and texture among different materials, it can precisely separate abnormal color particles, moldy particles, impurities and various types of particles.

Advantages:

✅  Precisely remove any non-uniform or deteriorated particles: Relying on high-definition optical recognition and intelligent algorithms, it accurately eliminates moldy coffee beans, diseased spots, insect-infested coffee beans, blackheads, and abnormal color mixed coffee beans.

✅ Intelligent operation, simple to operate: Intelligent screen, adjustable parameters, simple operation, stable operation for long-term continuous use.

✅ Adaptable, suitable for multiple sources of supply: It can be switched between coffee beans and mung beans in one click, and is suitable for raw materials from different production areas.

(9) Coffee beans Auto packing machine  — Automatically complete coffee beans quantitative measurement and packaging.

Function:

✅ The coffee beans auto packing machine used for packing the coffee beans, From 10kg-50kg per bag, electronic controlled automatic.At the end of the coffee beans production line, automatic feeding, weighing, discharging and bagging are carried out in a continuous process, replacing manual filling and weight estimation, significantly improving the packaging efficiency.

Advantages:

✅  Precise measurement and weighing: Accurate weighing, small quantitative error, and unified measurement standards.

✅ Save manpower: Reduce the need for multiple people to weigh, carry bags, and prepare ingredients, thereby lowering labor costs.

✅ The operation is simple:One-click setting of weight, automatic adjustment of speed and capacity. Easy to switch specifications. Compatible with various packaging types of beans.

三、The advantages of the coffee beans processing plant?

1、The process is seamless, and impurity removal is comprehensive and thorough.

First, the coffee beans processing plant includes the pre-cleaner, Air screen cleaner, De-stoneer,Gravity separator,magnetic separator, grading machine, polishing machine,color sorter, and Auto packaging machine.The entire production line employs a closed-loop process comprising initial cleaning, air-screen separation, destoning, gravity separation, color sorting, and automated packaging. This sequence systematically removes coarse impurities, dust, grit, stones; through this multi-stage, progressive purification, the finished product achieves a high level of purity.

2、High degree of automation, saving manpower

Our entire  coffee beans production line is highly automated. The entire process features continuous mechanical transportation, automatic sorting, and quantitative packaging, eliminating the need for manual screening, handling, and weighing. This reduces reliance on human labor and significantly increases processing efficiency.

3、All the components of the entire machine are made from the world's top brands.

The coffee beans processing plant core electrical, transmission, sealing, and sensing components are sourced exclusively from leading international top-tier brands, ensuring that all critical parts feature high-standard configurations. By addressing potential issues—such as wear and tear, aging, electrical faults, and mechanical jamming—at the source, the equipment achieves exceptional operational stability. This results in a significantly reduced failure rate, minimizes downtime for maintenance, and guarantees the long-term, continuous, and efficient operation of the coffee beans processing line.