Solutions · Plastic Compounding
Compounding brings polymers, fillers, and additives together – each with its own flow behavior. PW Silo Systems designs aluminum and stainless steel silos for compound pellets and their raw materials, with reliable discharge for fillers and clear separation of recipes.
Compounding Storage at a Glance
A plastic compound silo stores finished compound pellets – or the polymers, fillers, and additives that go into them – between delivery, compounding, and shipping or processing. It protects the material from contamination and feeds it reliably to dosing.
Compounders handle pellets, fine fillers, and many recipes side by side. PW Silo Systems combines storage silos, blending silos, filtration, and discharge solutions into one system that fits your plant.
Why Compounding Is Demanding
Fillers, recipes, and consistency decide how a compounding silo system is built.
Fillers such as calcium carbonate, talc, and kaolin are fine powders that can bridge.
Compounders work with many polymers, fillers, and additives at the same time.
Filling and conveying fine fillers release dust. Some raw materials, such as wood flour, are combustible.
Production lots differ, and a silo filled in batches forms layers of different quality.
In coated carbon steel silos, flaking paint and rust particles can end up in the compound.
Polymer production and compounding need large storage capacities – often more than a road-transportable silo can hold.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Both materials offer high corrosion resistance and a long service life – without a coating as the only protection against corrosion.
Which of our two materials fits your compound silo depends on your product, your process, and your site. We review it with you.
Your Compound Silo System
Storage silos, panel silos, blending silos, process silos, filtration, and safety equipment are engineered as one system. That means fewer interfaces for your team.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreLarge Volumes
Seal-welded panel silos up to 53,000 ft³ for petrochemicals, plastics, and recycling.
Learn moreBlending
Blending and homogenizing of polymer pellets with PW PipeBlend and PW CentralPipeBlend.
Learn moreProcess
Process silos for deodorizing, degassing, and drying.
Learn moreFiltration
Dust separation during filling and conveying.
Learn moreSafety & Monitoring
Rupture discs or explosion vents for combustible dust, level measurement for reliable monitoring of the silo content.
Learn moreCompounds & Raw Materials
Products marked “Tested in our lab” are on our list of bulk materials. The others we review with you based on your material data before designing the silo.
Tested in our lab
Plastic compound, compound pellets
Plastic compound is on our list of bulk materials tested in our lab.
Tested in our lab
PP compound, filled PP
PP compound is on our tested list.
Tested in our lab
WPC compound, wood-plastic composite
WPC compound is on our tested list.
Tested in our lab
Calcium carbonate, chalk, PCC
Calcium carbonate, chalk, and precipitated calcium carbonate are on our tested list.
Tested in our lab
Talc, kaolin
Talc and kaolin are on our tested list.
Tested in our lab
Aluminum hydroxide (ATH)
Aluminum hydroxide is on our tested list.
Tested in our lab
Titanium dioxide, carbon black
Titanium dioxide and carbon black are on our tested list.
Tested in our lab
Plastic additives, wood flour, barium sulfate
Plastic additives, wood flour, and barium sulfate are on our tested list.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Material Check
Type in your material or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
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Service in the U.S.
With more than 40 years of experience in silo engineering, we support your compound silo project from the first design discussion to commissioning. We deliver to every U.S. state and install with our own qualified personnel.
FAQ
Answers to the questions plant managers, engineers, and buyers ask most often about silos for plastic compounding.
These products are on our list of bulk materials tested in our lab:
Glass fibers, MDH, and other fillers we review with you based on your material data.
PW FlowLine adds tailored discharge solutions for poorly flowing bulk solids – such as PW SpeedBlow air fluidization and bin activators. Which solution fits depends on your filler and your process. We review it with you.
We recommend a dedicated silo per product – or PW StoreLine multi-compartment silos that keep several products separate in one silo.
PW BlendLine silos blend and homogenize polymer pellets – with PW PipeBlend or PW CentralPipeBlend, depending on your product and throughput.
Seal-welded PW PanelLine silos reach capacities of up to 53,000 ft³. Their prefabricated components travel in standard containers or on curtain-side trucks – no oversize transport permits – and are assembled on site.
Both are possible. Which material fits your compound silo depends on your product, your process, and your site. We review the options with you.
Yes. We deliver to every U.S. state and support your project with silo transport, field assembly, silo installation and supervision, and site relocation of existing systems.
Very likely. Our silo systems are designed for nearly all free-flowing, granular, and powdered bulk solids. Send us your material details – kernel size, moisture, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your compound grades, required storage capacity, how the silo is filled and discharged, and your site conditions. Based on this, we work out the material, silo type, and configuration with you and send you a detailed quote.
Your Project
Whether you need a single compound silo, a large panel silo, or a complete system with blending and process silos, tell us about your requirements. We'll develop a solution that fits your product, your process, and your site.
Send a Request NowWhat Happens Next
Tell us about your bulk material, your process, and your site conditions.
We work with you on material, silo type, and configuration – based on a bulk material analysis if needed.
You receive a custom-engineered solution with a detailed quote.
