TPEI is a U.S.-based continuous mixer manufacturer that has designed, built, and serviced compounding equipment since 1979. From our Lehighton, Pennsylvania facility we produce continuous mixers, extruders, and complete turnkey compounding systems for plastics and rubber processors. Every machine is engineered, assembled, and test-run in-house before it ships.

We support plastics, rubber, and recycling operations, from commodity resins to demanding elastomers like EPDM and silicone. Our continuous mixers use short L/D ratios built for high filler compounding equipment and value-added recycling, where dispersion and heat control matter most. If your formulation is difficult, that is exactly what our machines are designed to run.

Yes. Continuous mixer rebuild services and extruder retrofit services are core to what we do. We handle complete or component rebuilds, control system upgrades, gearbox rebuilding for mixers, and rotor restacking services, restoring original capacity or upgrading legacy equipment to current performance standards. We start by inspecting and diagnosing the installed machine, then define scope, budget, and upgrade targets before any work begins.

Most parts ship immediately from stock. We manufacture close-tolerance spare parts for continuous mixers in-house, including rotors, chamber liners for continuous mixers, visco seals, bearings, breaker plates, and seal rings, with performance equal to new. If we do not stock it, we will build it.

Our emergency service runs 24/7/365. We dispatch on-site technicians, handle gearbox rebuilding for mixers and drive repair, machine critical parts fast, and provide laser alignment and line-restart support to get you running again. Line-down events are treated with same-day urgency, not a ticket queue.

Our continuous mixers use short L/D ratios and Class A cleanouts engineered for fast color and formulation changeovers. Color concentrate and masterbatch lines are built for changeovers in as little as 30 minutes. Less time cleaning out means more time producing.

Yes. Turnkey compounding system design is a core capability. We integrate feeders, mixing, extrusion, controls, and pelletizing into one line, with PLC and HMI automation built on Allen-Bradley or Siemens platforms. Systems are factory-assembled and test-run before shipment, with on-site assembly and startup typically within two weeks of delivery.

Our mixers use proprietary Free Rotor (FR) and Extended Rotor (FRE) designs, compact chambers tuned for temperature and residence-time control, and full automation for consistent throughput. The short L/D geometry is purpose-built for high filler compounding equipment and continuous mixers for recycling. The result is cleaner mixes, higher output, and fewer maintenance cycles.

Yes. Our 1FRE laboratory compounding line and pilot systems let you develop formulations, run trials, and validate a process before committing to full production. It is the same mixing technology, scaled down, so what works in the lab transfers cleanly to the plant.

In most cases a rebuild restores original capacity at a fraction of replacement cost and extends the life of equipment you already trust. We inspect the machine, document its condition, and give you a clear scope so the rebuild-versus-replace call is made on real numbers. When an upgrade or replacement is the smarter investment, we will tell you.

Yes. Through contract manufacturing we reverse-engineer legacy parts, develop AutoCAD drawings, and produce close-tolerance components from prototype through volume. We also machine replacement screws and barrels to fit major OEM extruder brands. Bring us a worn part or an old drawing and we will reproduce it to spec.

Talk to an engineer. Tell us the machine, the material, and the problem you are solving, and we will recommend the right mixer, extruder, system, rebuild, or part. No layers, no runaround, just a direct line to the people who build and service the equipment.