Solutions · Plastic Additive Storage
Additives decide the properties of your compound – even in small quantities. Impact modifiers, stabilizers, lubricants, and other additives come as powders, granules, or flakes and must reach the mixer in exactly the right amount. PW Silo Systems designs aluminum and stainless steel silos for plastic additives with you.
Plastic Additive Storage at a Glance
A plastic additive silo stores impact modifiers, stabilizers, lubricants, fillers, and other additives close to compounding, extrusion, or PVC dry blend production. It keeps each additive clean and separate and feeds it in a controlled way to weighing and dosing.
Additives are used in small quantities, but every batch needs the right amount. Many plants handle several additives side by side – as powders, granules, or flakes with very different flow behavior. Silo size, discharge, and dust collection are therefore designed together with you for your additives and your process.
Why Plastic Additives Are Demanding
Many products, small quantities, and different flow behavior decide whether an additive silo system runs reliably.
Compounders often handle several additives at once. Mixing them up changes the properties of the compound.
Additives are dosed in small amounts – but every batch needs exactly the right quantity.
Powders bridge, flakes interlock, and granules flow freely – each additive behaves differently in the silo.
Fine additive powders dust during pneumatic filling and conveying.
Contamination from flaking coating or rust can show up as specks or defects in the end product.
Venting, filtration, and explosion protection depend on the additive and its particle size.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Carbon steel is not an option for us: its coating is the only protection against corrosion – and flaking coating or rust can end up in your compound.
Which of our two materials fits your additive silo depends on the product, your process, and your site. We select the material and the design with you.
Your Plastic Additive Silo System
Silo, discharge, blending, filtration, and monitoring are engineered as one system. That means fewer interfaces for your team and components that are designed to work together.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreBlending
Gravity blending and homogenizing with four technologies, including PW ConeBlend with a hopper that is quick to clean.
Learn moreDischarge
Air fluidization for uniform discharge of poorly flowing products – prevents bridging and can be retrofitted to existing silos.
Learn moreDischarge
Vibration from unbalanced motors breaks up cohesive forces, resolves caking, and keeps the outlet clear.
Learn moreFiltration
Dust separation during pneumatic filling and conveying – sized for fine powders.
Learn moreMonitoring
Level measurement for reliable monitoring of the silo content – so you know when to reorder.
Learn moreAdditives & Modifiers
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 additives, additive blends, compounding additives
Plastic additives are on our list of bulk materials tested in our lab. Silo and discharge are designed for your product form.
Tested in our lab
Impact modifiers, toughening agents
Impact modifiers are on our tested list. Discharge and dust collection are planned for your grade.
Tested in our lab
Hydrotalcite, acid scavenger
Hydrotalcite is on our tested list. Outlet and discharge are designed for its fine particles.
Tested in our lab
Potassium stearate and other stearates
Potassium stearate is on our tested list. Storage conditions for your site we clarify with you.
Review with us
Antioxidants, heat stabilizers
Antioxidants and stabilizers differ in product form and flow behavior. We review your product data with you before designing the silo.
Review with us
UV stabilizers, light stabilizers
UV stabilizers are often used in small quantities. We review the right storage with you.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Additive Check
Type in your additive or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
Try: , ,
Service in the U.S.
With more than 40 years of experience in silo engineering, we support your plastic additive 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 storing plastic additives and modifiers in silos.
Dry additives can be stored in a properly designed silo. These products are on our list of bulk materials tested in our lab:
Antioxidants, UV stabilizers, and other additives we review with you based on your material data.
That depends on your consumption, delivery form, and the number of additives. Silos reduce manual handling of bags and big bags and keep products separate. We size the system with you – without oversized investment.
We recommend a dedicated silo per additive – or PW StoreLine multi-compartment silos that keep several products separate in one silo.
Integrated filters and PW FilterLine dust collectors separate dust during pneumatic filling and conveying. Explosion protection we review with you where your product requires it.
In mass flow, the entire silo content moves downward when material is discharged – not just a channel in the center. Your plastic additives leaves the silo in the order it came in (first in, first out), and no product is left behind in dead zones. Our PW StoreLine silos are designed for concentric mass-flow discharge without asymmetric flow zones.
We build silos exclusively in aluminum and stainless steel – never in coated carbon steel, so no flaking coating or rust can contaminate your compound. Which of our two materials fits depends on the product, your process, and your site. We select it with you.
The right size depends on your daily consumption, delivery intervals, the number of products, and the space available at your site. PW StoreLine silos are available in a wide range of sizes and diameters, and silos too large for road transport are assembled on site. We size the system with you – without oversized investment.
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 – particle size, bulk density, moisture, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your products, 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.
