Whether you’re building a new facility, adding a production line, or looking to upgrade an existing process, one of the first and most consequential decisions you’ll face is how to move dry ingredients through your operation. Get it right, and your system runs efficiently for years. Get it wrong, and you’re dealing with maintenance headaches, throughput bottlenecks, and costs you didn’t anticipate.
There’s no one-size-fits-all answer. The best conveying solution depends on your facility layout, your ingredient profile, your production volume, and your operational goals. Here we have a practical breakdown of the two main approaches, when each makes sense, and what pet food manufacturers specifically need to consider when making this decision.
Mechanical Conveying: How It Works and When It Makes Sense
Mechanical conveying relies on physical components, most commonly screw conveyors (augers), belt conveyors, and bucket elevators, to move material from one point to another. In many facilities, gravity does a significant portion of the work. If you’ve ever walked into a tall manufacturing building with multiple levels and mezzanines, you’ve probably seen a gravity-fed mechanical system in action: ingredients come in at the top level, move through processing equipment on each floor, and arrive at the finished product stage at the ground level.
Mechanical conveying tends to be straightforward to understand, operate, and maintain, particularly for facilities that aren’t moving material over long horizontal distances. Bulk bag unloaders, gravity-fed hoppers, and auger systems are reliable, well-understood technologies that don’t require a lot of supporting infrastructure.
Where mechanical conveying runs into limitations is when you need to move ingredients across a large horizontal footprint. The moment you try to extend a screw conveyor system over a long distance, you end up stacking drive after drive after drive. Every additional drive is another motor to maintain, another potential failure point, and more complexity in your system. For spread-out, single-level facilities, mechanical conveying can quickly become impractical.
Pneumatic Conveying: How It Works and When It Makes Sense
Pneumatic conveying uses air pressure or vacuum to transport dry material through a sealed pipeline. There are two primary types: dilute phase, which suspends material in a high-velocity airstream, and dense phase, which moves material in slugs at lower velocity and is typically used for fragile or abrasive materials.
The core advantage of pneumatic conveying is the ability to move material over long distances for relatively low cost and complexity. A single pipeline can carry ingredients from one end of a facility to the other, around corners, up and over obstacles, without the need for multiple drives or mechanical handoffs. For wide, spread-out facilities, this is often the most practical and cost-effective solution.
Pneumatic systems are also enclosed, which helps with dust control and sanitation, both important considerations in food manufacturing environments where a lot of dry powder ingredients are being used. The sealed pipeline means less product exposure to the surrounding environment and less airborne dust for workers.
The tradeoffs are worth understanding. Pneumatic systems require a blower or vacuum source, a filter receiver to separate product from air at the destination, and careful system design to match airflow, pipe sizing, and blower capacity to your specific material and throughput requirements. An undersized blower or an incorrectly sized filter receiver creates real operational problems. Proper sizing from the start is essential.
Why Many Facilities Use Both
It’s worth noting that mechanical and pneumatic conveying aren’t mutually exclusive. Many well-designed facilities use both, each where it performs best.
A common scenario in pet food manufacturing looks like this: bulk ingredients arrive in bulk bags or silos and are unloaded mechanically into hoppers or weigh stations near the point of use. From there, pneumatic conveying picks up the transfer work, moving ingredients across the production floor to blenders, mixers, or packaging lines. The mechanical system handles the vertical and short-distance work efficiently; the pneumatic system handles the long runs.
Having a partner who can design and build both types of systems, rather than one who only offers pneumatic or only mechanical, is a significant advantage. It means your system is designed around what your operation actually needs, not around what your vendor happens to sell.
That advantage compounds when your partner also understands bulk bags and bulk bag unloading. Conveying doesn’t happen in isolation. It starts the moment your ingredients arrive on your floor, typically in bulk bags. How those bags are unloaded, how material flows from the bag into your process, and how it then gets transferred to the next stage are all connected decisions. A partner who only knows conveying is handing you half a solution. A partner who designs and builds bulk bags, unloaders, and conveying systems together can engineer the entire ingredient flow as one integrated system, which means fewer handoff problems, better accuracy, and a cleaner overall design.
This matters practically in a few ways. Bulk bag unloader design affects how cleanly material feeds into a conveying line. Scale integration on the unloader affects batching accuracy downstream. And if something isn’t working right, having one partner who owns the full system is far easier to troubleshoot than coordinating between a bag supplier, an unloader vendor, and a conveying company who each point to someone else when a problem arises.
What Pet Food Manufacturers Specifically Need to Consider
The general principles above apply across industries, but pet food manufacturing has its own set of nuances that should inform your conveying system design.
Bulk Ingredients vs. Minor Additives Require Different Approaches
Most pet food formulas involve two distinct categories of ingredients: high-volume bulk ingredients like proteins, grains, and starches, and low-volume minor additives like flavorings, colorings, vitamins, and in some cases, medicated components.
For bulk ingredients, your primary concerns are throughput, efficiency, and reliability. These materials are typically well-behaved, relatively consistent in density, and don’t require precision down to the gram. A well-sized pneumatic or mechanical system handles them without issue.
Minor additives are a different story. Some flavorings, colorings, and specialty compounds are expensive per pound, meaning that even small measurement errors add up quickly over time. A few ounces of giveaway per batch doesn’t sound like much until you run the numbers across thousands of batches per year. For these ingredients, precision feeding equipment such as loss-in-weight or gain-in-weight feeders capable of measuring to the gram becomes an important part of your system design.
The level of automation you apply to minor additive measurement should reflect what your operation can realistically support. A highly automated batching system for minor ingredients is a great investment if you have the technical staff to operate and maintain it. If you don’t, a simpler but still accurate system may serve you better in the long run.
Most Dry Pet Food Ingredients Are Easy to Work With
The good news for pet food manufacturers is that most dry ingredients behave similarly from a conveying standpoint. The density variation across common proteins, grains, and base ingredients is manageable, and a properly designed pneumatic system can be tuned, via blower speed and airflow, to handle the range without significant system changes.
Where you need to pay closer attention is with minor additives that have unusual physical properties. Sticky ingredients, materials that absorb moisture and agglomerate, or anything that can compact and stick together requires more careful handling. If you can make a snowball out of it, it’s going to behave differently in a pneumatic line than a free-flowing powder. These materials need to be identified upfront and tested before your system is designed.
Specialty Formulas May Have Different Material Contact Requirements
Standard pet food production can often use aluminum pipe with stainless steel elbows, a practical choice since elbows are where wear typically occurs and where a harder material makes sense. However, specialty formulas, including hypoallergenic products, medicated formulas, and certain performance or veterinary diets, may need full stainless steel product contact surfaces if that’s what you require. In some cases, tri-clover fittings offer easier breakdown and cleaning.
Understanding your process requirements before you design your system avoids the cost and disruption of retrofitting later. These conversations are worth having early with your conveying partner.
Choosing the Right Partner Matters as Much as Choosing the Right System
The best conveying system for your operation isn’t determined by what’s most technically impressive or what carries the largest price tag. It’s determined by what fits your facility layout, your material profile, your throughput goals, and your team’s ability to operate and maintain it.
That’s why working with a partner who takes the time to understand your operation before recommending equipment is so important. A vendor who only offers one type of conveying will find a way to make that technology work for your situation. A vendor who offers both mechanical and pneumatic, and who designs systems to your specific requirements rather than to a catalog standard, can recommend what’s actually right for you.
At FormPak Group, we take it a step further than conveying alone. Because we design and manufacture bulk bags and bulk bag handling equipment alongside our mechanical and pneumatic conveying systems, we can engineer your entire ingredient flow as one optimized solution, starting from the bag itself. We let the material drive the solution, not the other way around. That means the right bag, the right unloader, and the right conveying system, all sized and designed to work together from the start. If you’re planning a new line, expanding your facility, or troubleshooting an existing system, we’d like to help you figure out what the right approach looks like for your operation, from the bag out.
We also offer free material testing and a performance guarantee for any system we design and build for your pet food facility. To get started, request your material test.