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Size Reduction
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Milling with Exwold for Maximum Performance
Exwold offers specialised contract size reduction and particle size reduction services for a wide array of chemical and industrial solids. Through our extensive suite of milling capabilities, we can transform raw materials into precisely defined powder grades, handling everything from kibbling large lumps to achieving sub-10 micron particle sizes.
Contract Size Reduction Services
At Exwold we have been kibbling, milling and micronising solids, granules and powders for decades and have built a reputation for quality and a collaborative approach to our clients. Always looking to develop new and innovative solutions for existing and potential clients, we have helped our clients to achieve particle sizes suitable for wide ranging applications such as Plastic Additives, Water Treatment, Powder Catalysts, Crop Protection and Chemical Intermediates. Download our document on why particle size distribution really matters.
Contract Kibbling & Crushing
Exwold provides contract kibbling and crushing services designed to convert difficult materials into manageable feed sources. Over time, hygroscopic or sensitive powders can become solid blocks during storage. We offer a solution to reclaim this stock.
Process Description
Kibbling is a particle size reduction technique, often referred to as crushing, de-compaction, or granulating.
The process utilises cheese-grater type screens or rotating knives to produce a coarse product. Typically, this results in particle diameters ranging between 3mm and 25mm. We can tailor this process to meet your specific particle size specifications and packaging requirements.
When is Kibbling Required?
This service is the ideal solution for materials that have deteriorated in storage or transport, specifically products that are:
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Fused: Materials that have chemically or physically bonded.
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Compacted: Powders that have become dense blocks due to pressure or settling.
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Hardened: Products that have set over time.
By reworking these materials, we return them to a usable, free-flowing state, saving you the cost of disposal and lost inventory.
Contact Us
To discuss how we can help reclaim your stock through kibbling, please contact us on +44 (0)1429 230340. Alternatively, you can email enquiries@exwold.com and we will respond to your enquiry.
Contract Milling Services
At Exwold, we offer a diverse range of milling processes designed to meet specific particle size requirements. By evaluating the physical properties and safety characteristics of your material, we select the optimal milling technology to achieve your specification.
Our Capabilities:
Coarse Milling: Using hammer and pin Mills, we produce coarse materials with particle diameters of 2000 microns or below.
Fine Milling: Using our Baumeister Turbo Mill, we achieve finer particle sizes down to 75 microns.
Market Expertise
We have extensive experience providing contract milling services for speciality markets, including:
- Plastic Additives
- Powder Coatings
- Catalysts
- Chemical Intermediates
Contact Us
For expert advice on achieving your required particle size, call our team on +44 (0)1429 230340 or email your requirements to enquiries@exwold.com.
Powder Micronising Technologies
Leverage Exwold’s extensive outsourcing experience in powder micronising to refine your fine powders down to low micron levels. From laboratory trials to full-scale commercial production, we provide precision particle size reduction tailored to your needs.
Our Capabilities:
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Air Classifier Milling (ACM): Precision milling to approximately 10 microns.
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Commercial Scale: Capacity to handle campaigns from single tonnes upwards.
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Integrated Processing: On-site powder blending capabilities to complement the milling process.
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Scalability: Access to pilot and laboratory-scale equipment, including jet micronisation, ensuring a seamless transition to production.
A Proven Track Record
Exwold has a long history of micronising a wide range of active ingredients on a commercial scale. We are experienced in handling materials with complex safety requirements and hazardous properties.
Technical Development Centre
To ensure you choose the right milling technology, we offer laboratory and pilot-scale evaluations in our Technical Development Centre. These trials provide the data and confidence you need before committing to full-scale manufacture.
Contact Us
Ready to discuss your project? Call our Customer Service team on +44 (0)1429 230340 for an expert evaluation, or email us at enquiries@exwold.com.
Precision Milling Solutions
At Exwold, we mill powders to optimize their physical properties, ensuring they meet the exacting standards of our customers' diverse applications. By reducing particle size, we achieve three critical technical objectives:
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Increased Surface Area: Accelerates chemical reaction rates, improves dissolution speeds, and ensures faster, more efficient drying.
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Superior Flow & Mixing: Creating uniform particle sizes eliminates segregation and improves material flow for downstream processing.
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Consistent Quality: Precise control over particle size distribution (PSD) ensures repeatable product performance and high-quality results in every batch.
Our Milling Capabilities
We operate a versatile range of milling technologies, allowing us to deliver precise particle size distributions across a wide spectrum—from coarse granules to ultra-fine powders.
| Technology | Typical Particle Size Range | Best For... |
| Granulator | 0.5 mm – 1 mm | Targeted coarse milling for granular materials. |
| Hammer Mill | Down to 100 µm | Robust reduction with a finer "bottom cut" than standard granulation. |
| Cone Mill | Typically 1000 µm (1 mm) | Gentle milling where size is controlled by screen selection and throughput. |
| Universal Pin Mill | 600 µm – 50 µm | Versatile processing; size is highly dependent on screen size and feed rates. |
| Air Classifier Mill (ACM) | 500 µm – 25 µm | Integrated particle size control for precise, narrow distributions. |
| Air Jet Mill | 100 µm – 3 µm | Our finest milling technology for ultra-fine particle size requirements. |
Expertise That Delivers
Choosing the right milling technology is dependent on your specific material characteristics and target PSD. Exwold’s technical team works closely with you to select the optimal equipment to ensure your product performs exactly as intended. Contact our team.
Our Resources Section
Discover our range of support services and browse our resource library for in-depth case studies and capabilities. Access key reports, policies, and guides in our downloads area, or visit our media and FAQ sections for more information.
Case Studies
Surface Coating Blending
A multinational company required a cost-effective 2mm granule of a waxy product used as surface coating additive .
The product had not been previously extruded. The material was supplied as a waxy solid block with a melting point below 100 ºC.
The material also required careful handling as it was corrosive and a significant aim was to reduce contact hazards.
Surface Coating Additive Milling
Exwold was approached by a leading chemical company to process a range of automotive surface coating additives.
The surface coating additive is produced as a molten solid in drums. Once cooled it forms a waxy, solid mass. The material has a low melting point <50ºC. The client required this in physical form to charge into coating with a specific particle size distribution to ensure dispersion.
Coating Processing
A powder coating manufacturer contacted us to establish whether a process could be established to recycle fines (the fine powder generated and removed during powder coating manufacture).
The company was sending around 10-25mt of fines to landfill each year and wanted to reduce the environmental and financial impact. The fines ranged in PSD but were typically 150 microns.
Downloads
Supplier Code of Conduct
Exwold is committed to doing business responsibly, ethically and sustainably at all times.
The company adheres to the highest code of conduct and expects its suppliers to do the same. Exwold will only deal with suppliers, consultants and distributors who conduct business in an ethical and responsible manner. Our supplier code of conduct ensures we work together.
Booking In Form
Our booking-in form ensures every collection and delivery to site is managed safely, efficiently, and with transparency.
By confirming arrival times and key details in advance, we can prepare the right resources, minimise delays, and maintain a secure working environment. It also provides a clear audit trail for all shipments, helping us protect product integrity and meet regulatory and safety requirements.
Reports
ESG Report 2025
Our ESG Report embodies our commitment to sustainability, ethical business practices, and transparency. Through this report, we detail how we measure and manage our environmental impact, uphold human rights and employee well-being, and enforce high standards of corporate governance. By doing so, we build trust with stakeholders and demonstrate accountability, showing that profitability and responsibility can go hand in hand.
Particle Size Distribution
Particle Size Distribution (PSD) is a key factor that determines how powders and granular materials behave during processing and final use. Even with identical chemistry, variations can affect flow, stability, reactivity, and product appearance.
This guide outlines what PSD is, why it matters, and how effective measurement and control lead to greater efficiencies and quality.