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Ø25×140 mm N42 Neodymium Magnetic Bar for Coffee Processing
Ø25×140 mm N42 Neodymium Magnetic Bar for Coffee Processing
General Features
- Designed to help remove ferromagnetic metal contaminants from coffee processing and production lines
- Suitable for selected green coffee bean, roasted coffee bean and ground coffee transfer points
- Compact Ø25×140 mm construction for small hoppers and narrow product passages
- N42 neodymium magnetic system operates without an external electrical power supply
- M6 female threaded connection for integration with suitable machine supports and mounting fixtures
- Stainless steel outer housing with AISI 304 and AISI 316L material options
- Manually cleaned magnetic surface for periodic removal of captured ferromagnetic particles
- Can be used as a single magnetic bar or incorporated into a suitably engineered mounting assembly
Technical Features
- Dimensions: Ø25×140 mm
- Diameter: Ø25 mm
- Length: 140 mm
- Magnet material: Neodymium (NdFeB)
- Magnet grade: N42
- Mounting connection: M6 female thread
- Maximum operating temperature: 80 °C
- Stated minimum Fe particle size: 0.03 mm / 30 microns
- Housing material options: AISI 304 / AISI 316L stainless steel
- Cleaning method: Manual
- Product configuration: Single magnetic separation bar
- Power requirement: No external electrical power supply
The Ø25×140 mm N42 Neodymium Magnetic Bar is designed to help capture ferromagnetic metal particles at suitable transfer and feeding points in coffee processing lines. Its compact stainless steel construction and M6 female threaded connection allow installation in selected coffee bean handling, grinding preparation, dosing and pre-packaging applications. Separation performance depends on product flow, particle properties, installation geometry and regular manual cleaning.
| Technical Specification | Description |
|---|---|
| Product Type | Neodymium magnetic separation bar |
| Application | Coffee processing and production lines |
| Dimensions | Ø25×140 mm |
| Diameter | 25 mm |
| Length | 140 mm |
| Magnet Material | Neodymium (NdFeB) |
| Magnet Grade | N42 |
| Mounting Connection | M6 female thread |
| Maximum Operating Temperature | 80 °C |
| Stated Minimum Fe Particle Size | 0.03 mm / 30 microns |
| Housing Material | AISI 304 / AISI 316L stainless steel options |
| Product Configuration | Single magnetic bar |
| Cleaning Method | Manual |
| Power Requirement | No external electrical supply |
| Suitable Product Forms | Coffee beans and ground coffee at appropriate transfer points |
| Separation Target | Ferromagnetic metal particles |
1. Neodymium Magnetic Bar for Coffee Processing Lines
The Ø25×140 mm N42 Neodymium Magnetic Bar is a compact magnetic separation component developed for suitable locations within industrial coffee processing lines.
Its primary purpose is to help capture ferromagnetic metal particles that may enter the product stream during raw material handling, conveying, grinding preparation or other mechanical operations.
The magnetic assembly uses N42-grade neodymium magnets housed within a stainless steel outer body. It operates without requiring an external electrical power supply.
Effective separation requires appropriate installation, sufficient exposure of the product to the magnetic surface and regular inspection of captured contaminants.
2. Magnetic Separation in Coffee Production
Industrial coffee production involves multiple processing stages, including raw coffee reception, storage, roasting, conveying, grinding, dosing and packaging.
Throughout these operations, coffee beans and ground coffee may come into contact with mechanical equipment and transfer components.
Ferromagnetic contamination can originate from raw materials, worn machine parts, loose fasteners or maintenance activities.
Installing a magnetic separation point at a suitable location can help reduce the transfer of certain iron-based contaminants to subsequent processing stages.
3. Ferromagnetic Metal Contamination Control
Ferromagnetic contamination control is an important consideration in coffee processing facilities.
Iron particles, carbon steel fragments and certain magnetic steel contaminants can be attracted to a magnetic surface when they pass sufficiently close to it.
The actual capture efficiency depends on particle size, shape, magnetic properties, product flow and distance from the magnetic bar.
A magnetic bar is not a universal metal detector and should not be expected to capture nonmagnetic contaminants such as aluminium, copper or brass.
4. Compact Ø25×140 mm Magnetic Bar Design
This magnetic bar has a nominal diameter of 25 mm and a length of 140 mm.
Its compact dimensions make it suitable for consideration in small hoppers, narrow transfer passages and machinery where installation space is limited.
The bar may be integrated into an appropriately designed support or mounting assembly.
However, a single 140 mm magnetic bar cannot automatically provide adequate magnetic coverage across a wide product passage. The installation geometry must be evaluated.
5. N42 Neodymium Magnetic System
The internal magnetic system uses N42-grade neodymium magnets belonging to the NdFeB material family.
Neodymium magnets are commonly used in industrial magnetic separation equipment because they can provide strong magnetic performance within compact dimensions.
The N42 designation identifies the magnet material grade. It does not, by itself, establish the magnetic flux density at the outer surface of the complete assembly.
The suitability of the bar should therefore be assessed using its construction, the intended application and the actual operating conditions rather than magnet grade alone.
6. Magnetic Separation Without Electrical Power
The magnetic bar uses permanent neodymium magnets and does not require an external electrical power supply to generate its magnetic field.
This allows it to function as a passive magnetic separation component when installed in an appropriate product passage.
The magnetic field remains present during normal operation and when the bar is removed for cleaning.
Personnel should therefore handle captured metal fragments carefully and follow suitable safety procedures during inspection and maintenance.
7. M6 Female Threaded Connection
The magnetic bar features an M6 female threaded mounting connection.
This connection allows the bar to be attached to a compatible threaded fastener, machine support or specially designed mounting bracket.
It is particularly useful when a compact magnetic separation component must be incorporated into an existing coffee processing machine.
The mounting arrangement should prevent loosening caused by vibration and should provide access for periodic cleaning and inspection.
8. Stainless Steel Housing Options
The outer housing is available with AISI 304 or AISI 316L stainless steel material options.
AISI 304 is widely used in industrial equipment, including many dry food processing applications.
AISI 316L may be considered where the cleaning environment, corrosion exposure or plant specification requires different material characteristics.
The selection should be based on the operating environment and applicable food-contact requirements. Stainless steel material selection alone does not certify the complete assembly for food contact.
9. Manual Cleaning and Contaminant Removal
The magnetic bar is designed for manual cleaning.
During operation, attracted ferromagnetic particles may accumulate on its external surface.
These particles must be removed at suitable intervals to maintain the intended magnetic separation function and reduce the risk of contaminant accumulation.
Cleaning frequency should be established according to the actual contamination load, production throughput and accessibility of the installation point.
10. Maximum Operating Temperature of 80 °C
The stated maximum operating temperature of this model is 80 °C.
Temperature is particularly important in coffee production because roasting equipment and nearby transfer systems can operate under elevated thermal conditions.
The temperature at the actual magnetic bar installation point must be assessed rather than relying only on the general temperature of the production area.
If continuous operating conditions exceed 80 °C, a magnetic system specifically designed for higher temperatures should be considered.
11. Stated Minimum Fe Particle Size of 30 Microns
The product specification states a minimum capturable iron particle size of 0.03 mm, equivalent to 30 microns.
This specification relates to particles with suitable ferromagnetic characteristics.
It should not be interpreted as a guarantee that every 30-micron particle will be captured under all operating conditions.
Actual capture performance depends on particle geometry, magnetic response, distance from the bar, product velocity and the arrangement of the magnetic separation point.
12. Magnetic Separation at Green Coffee Bean Feeding Points
Green coffee beans may pass through receiving hoppers, storage outlets, conveying systems and transfer channels before roasting.
A magnetic bar can be considered at a suitable feeding or transfer point to help retain ferromagnetic contaminants present in the product stream.
The position should encourage coffee beans to pass sufficiently close to the magnetic surface.
For wider hoppers or larger transfer passages, multiple magnetic bars or a dedicated magnetic separator assembly may provide more appropriate coverage.
13. Magnetic Control Before Coffee Roasting
Pre-roasting material handling may involve conveyors, elevators, feed hoppers and mechanical transfer equipment.
These components can introduce opportunities for ferromagnetic contamination through equipment wear or foreign metal fragments.
A magnetic separation point upstream of roasting may help capture suitable iron-based particles before the beans reach the next process stage.
The bar must not be installed in a location where operating temperatures exceed its stated 80 °C limit.
14. Applications in Roasted Coffee Bean Transfer
After roasting and cooling, coffee beans may be transferred through conveying equipment toward storage, grinding or packaging.
A compact magnetic bar can be evaluated at an appropriate transfer point where the beans pass close to its surface.
The mounting arrangement must account for the physical characteristics of roasted beans and their movement through the system.
Adequate product clearance is important to avoid unnecessary blockage or accumulation around the magnetic bar.
15. Magnetic Separation Before Coffee Grinding
Coffee grinders contain mechanical components designed to reduce roasted coffee beans to a controlled particle size.
Ferromagnetic foreign bodies entering a grinder may create unwanted processing conditions and can potentially damage sensitive components.
A magnetic control point before the grinder may help reduce the likelihood of suitable iron-based particles reaching the grinding mechanism.
The bar must be positioned within an appropriate feeding or transfer section and must not interfere with moving grinder components.
16. Applications in Ground Coffee Processing
Ground coffee behaves differently from whole coffee beans because it consists of much smaller particles.
The flow characteristics of ground coffee may be affected by moisture, particle size distribution, bulk density and equipment geometry.
A magnetic bar can be considered at a suitable discharge or transfer point where ground coffee passes near its surface.
The design must prevent excessive material accumulation and ensure that the product continues to flow through the process as intended.
17. Magnetic Control in Coffee Dosing Systems
Dosing systems are used to deliver controlled quantities of coffee beans or ground coffee to downstream equipment.
Where the machine configuration permits, a magnetic bar may be installed at a suitable inlet, outlet or intermediate transfer location.
The product stream should be directed close enough to the magnetic surface for meaningful exposure.
The magnetic bar must not obstruct dosing mechanisms or compromise the required consistency of product delivery.
18. Pre-Packaging Magnetic Separation
Coffee beans and ground coffee may pass through additional conveying and dosing equipment before reaching packaging machinery.
A magnetic separation point before packaging can provide another opportunity to capture suitable ferromagnetic contaminants introduced during upstream operations.
The location should be selected according to the available installation space, product flow and access for cleaning.
This magnetic control point should be considered part of a broader contamination management system rather than a substitute for all other inspection methods.
19. Differences Between Coffee Beans and Ground Coffee
Whole coffee beans and ground coffee have different physical flow characteristics.
Coffee beans are relatively large individual particles, while ground coffee forms a finer bulk material that may flow or accumulate differently.
For whole beans, the mounting arrangement should ensure suitable distribution of the product around the magnetic surface.
For ground coffee, additional attention may be needed to prevent thick product layers, material build-up and restricted flow around the bar.
20. Importance of Product Layer Thickness
The thickness of the product layer affects the distance between potential ferromagnetic contaminants and the magnetic surface.
Particles passing close to the bar experience different magnetic conditions from particles moving farther away within a thick layer of coffee.
This is especially relevant when processing ground coffee through wider transfer channels.
Suitable flow distribution, a thinner product layer or a multi-bar magnetic arrangement may be required to improve exposure to the magnetic surfaces.
21. Product Flow Rate and Separation Performance
Product flow rate can influence the interaction between ferromagnetic particles and the magnetic bar.
Particles moving rapidly through the separation area may spend less time near the effective magnetic field.
The flow rate should therefore be considered alongside product distribution, particle characteristics and installation geometry.
The correct magnetic separation solution must be selected for the actual process conditions rather than based solely on the dimensions or magnet grade of the bar.
22. Installation Orientation and Magnetic Coverage
The orientation of the magnetic bar influences how coffee beans or ground coffee move around its surface.
An appropriate installation should encourage a meaningful proportion of the product stream to pass through the effective magnetic region.
A bar installed only at the edge of a wide passage may leave much of the product too far from the magnetic surface.
The support arrangement should also allow safe removal, inspection and cleaning without interfering with nearby machine components.
23. Single Magnetic Bar or Multiple Magnetic Bars?
The Ø25×140 mm product is a single magnetic separation bar.
A single bar may be suitable for a small hopper or narrow product passage when the flow is directed sufficiently close to its surface.
For wider channels, one bar may not provide adequate coverage across the full product stream.
Alternative solutions may include multiple magnetic bars, magnetic grids, staggered bar arrangements or drawer-type magnetic separators.
24. Sources of Metal Contamination in Coffee Processing
Ferromagnetic metal particles may enter coffee production through several possible sources.
Examples include worn conveyor components, elevator mechanisms, grinder parts, screws, fasteners and tools used during maintenance.
Some metal contaminants may also arrive with incoming raw materials.
Identifying likely contamination sources helps determine where magnetic separation points should be installed and how frequently the equipment should be inspected.
25. Inspection and Preventive Maintenance
Regular inspection is necessary to maintain the magnetic bar in suitable operating condition.
The stainless steel housing and M6 female threaded mounting connection should be checked for visible damage, wear or loosening.
Any damaged component that could affect product safety, hygiene or mechanical reliability should be removed from service and evaluated.
Where magnetic performance verification is required, measurements should follow a documented procedure with appropriate acceptance criteria.
26. Limitations of Magnetic Metal Separation
Magnetic separation primarily targets particles with sufficient ferromagnetic properties.
Iron, carbon steel and certain magnetic steel particles can be attracted to the magnetic surface under suitable conditions.
Nonmagnetic metals such as aluminium, copper and brass are not reliably captured by this method. Some stainless steel grades may also exhibit insufficient magnetic response.
A magnetic bar should therefore not be described as guaranteeing the complete removal of all metal contaminants from coffee products.
27. Food Processing Hygiene and HACCP Integration
Magnetic separation can form part of a broader contamination control strategy within coffee production facilities.
Installation points, cleaning intervals, inspection procedures and acceptance criteria should be documented according to the plant’s operating requirements.
Where appropriate, the equipment may be included within a food safety management programme based on HACCP principles.
The suitability of the magnetic separator and its role in the overall control system should be established through the facility’s risk assessment and validation activities.
28. Magneteksan Magnetic Solutions for Coffee Production
Magneteksan develops industrial magnetic separation solutions for different processing applications, including coffee production and handling.
The Ø25×140 mm N42 Neodymium Magnetic Bar combines compact dimensions, an M6 female threaded mounting connection, stainless steel housing options and a permanent magnetic system that requires no external electrical supply.
The product can be considered for suitable coffee bean feeding, pre-grinding, ground coffee transfer, dosing and pre-packaging control points.
For accurate technical selection, the type of coffee, hourly production capacity, product passage dimensions, flow characteristics, operating temperature, mounting arrangement, cleaning access and expected ferromagnetic contaminants should be evaluated. Where a single bar is insufficient, a purpose-designed magnetic separation assembly may be more appropriate.
