RMS Industrial Pepper Grinder Improves Yield for Spice Processor

A spice processor’s grinding system produced excessive fines, leaving only a small portion of product in the desired 12–20 mesh range.

RMS tested the material in the RMS Test Lab using a roller-based industrial pepper grinder and adjusted roll settings to produce a more consistent particle size.

The optimized grind increased the percentage of product in the 12–20 mesh range to about 78% while significantly reducing fines.

Controlling particle size during pepper grinding is critical for maximizing product yield. A large spice producer in the United States approached RMS Roller-Grinder to test a roller-based industrial pepper grinder capable of producing a tighter particle size distribution. Their existing system generated too many fines and limited recovery in the desired particle size range.

Testing in the RMS Test Lab allowed engineers to optimize grinding parameters and shift particle distribution toward the target range. The results showed that roller milling can increase usable product yield.

The Grinding Challenge Facing Pepper Processors

Black pepper presents a unique grinding challenge due to its hard outer shell and brittle internal structure. Many traditional grinding systems rely on high-speed impact to fracture the peppercorns.

Impact grinding can break peppercorns too aggressively, producing too many fine particles. These fines reduce usable product and make screening less efficient.

The customer approached RMS with several clear objectives:

• Increase yield within the 12–20 mesh product range
• Reduce fines generation
• Improve screening efficiency
• Protect flavor by minimizing heat generation during grinding

Achieving these goals required evaluating a different type of industrial spice-crushing equipment capable of applying controlled mechanical force rather than high-speed impact.

Baseline Performance of the Existing Grinding Process

Before testing began, RMS engineers analyzed samples produced by the customer’s existing system using standard sieve testing.

The analysis revealed a big problem.

Only about 28% of the product fell within the 12–20 mesh target range, while nearly three-quarters of the material was over-ground into fine particles. Excess fines left less product in the desired range and increased the amount of material that had to be reprocessed.

Testing a Black Pepper Grinder in the Lab

To improve performance, RMS engineers conducted a series of controlled grinding trials using a roller mill configured as an industrial black pepper grinder.

Testing focused on several adjustable variables:

• Roll corrugation pattern
• Roll speed differential
• Roll gap settings
• Feed rate

Each trial was followed by a full sieve analysis to measure particle size distribution. This allowed engineers to systematically adjust machine settings and monitor how those changes influenced yield within the target range.

The objective was to reduce fines and increase the percentage of product in the target range.

Optimized Grinding Results

After refining the grinding parameters, the resulting particle distribution shifted dramatically.

Yield Improvement

Baseline yield in the 12–20 mesh range: ~28%
Optimized RMS grind: ~78%

The optimized grind nearly tripled usable product recovery in the desired particle size range.

Fines Reduction

Baseline fines: ~72% below 30 mesh
Optimized grind: ~19% fines

Reducing fines dramatically improved:

• Screening efficiency
• Product recovery
• Overall process economics

This improvement allows spice processors to increase sellable product without increasing raw material input.

Why Roller Mills Improve Pepper Grinding

Roller mills are highly effective for spice processing because they apply controlled compression rather than high-speed impact.

This controlled breakage provides several advantages during pepper grinding:

• Selective particle breakage
• Reduced fines generation
• Better particle size control
• Lower grinding temperatures that protect flavor compounds

Because the grinding force is adjustable, operators can tune an industrial pepper grinder to produce consistent particle sizes rather than excessive fines.

Collaborating with RMS in the Test Lab

One of the advantages RMS offers processors is access to the RMS Test Lab, where customers can evaluate grinding performance using their own materials.

During testing, customers can:

• Observe grinding trials in real time
• Walk through the equipment and process flow
• Adjust machine parameters during testing
• Review sieve analysis results with RMS engineers

This collaborative process allows spice producers to validate performance before investing in new industrial spice-crushing equipment.

Improving Yield With the Right Grinding Technology

Grinding black pepper efficiently requires careful control of particle breakage to maximize usable product while limiting fines.

Through testing in the RMS Test Lab, RMS engineers demonstrated how an optimized industrial pepper grinder can dramatically shift grind distribution toward valuable product sizes.

Processors considering upgrades to their industrial spice-crushing equipment can work directly with RMS engineers to test their materials, evaluate grinding performance, and identify the optimal configuration for their application.

Request a test grind to see how RMS technology can improve your pepper grinding process. Our team can also help you evaluate other RMS equipment and services for your operation.