Vibra Screw Incorporated has been the most trusted name in dry solids processing since 1955, when founder Eugene A. Wahl pioneered revolutionary ways to discharge and meter dry bulk solids through applied vibration. Today, Vibra Screw’s patented technology remains the industry standard for overcoming flow resistance in bins, hoppers, and silos — imparting controlled vibration directly to the material to produce smooth, consistent flow that conventional mechanical systems cannot match. The result is an improved order of accuracy in volumetric feeders, weigh feeders, and blending systems across the most demanding bulk solids processing applications.

Vibra Screw backs every machine with the industry’s best guarantee: if their equipment doesn’t perform in the service for which it was sold, they will refund your money — no time limits, no conditions. Trotter Equipment represents Vibra Screw across Ohio, Indiana, Kentucky, and West Virginia. Together, we evaluate material flow concerns and offer the ideal solution — from initial consultation through installation, commissioning, and ongoing support.

Vibra Screw Equipment

Vibra Screw designs and manufactures a comprehensive line of dry solids processing equipment for storing, discharging, metering, conveying, sizing, and blending bulk materials — all built in the U.S.A. and backed by their unconditional performance guarantee.

Bin Discharge & Flow Aid Equipment

• Bin Activators — Vibra Screw’s flagship product and the original vibrating bin discharger. The Bin Activator is mounted to the outlet of a storage bin, hopper, or silo and uses controlled vibration to promote reliable, consistent mass flow of difficult bulk materials that bridge, rat-hole, or pack under storage pressure. Eliminates the need for air pads, vibrators, or manual intervention. Available in carbon steel, stainless steel, and specialty alloys in sizes from 12 inches to over 144 inches in diameter. The most widely installed bin discharge device in the process industries.
• Vibrating Bins — Live-bottom vibrating storage bins that combine integrated storage with active discharge in a single unit. The entire bin bottom vibrates to promote consistent mass flow directly from storage into the downstream feeder or conveyor. Eliminates bridging and segregation for cohesive, sticky, or compressible bulk materials. Available in multiple configurations and capacities for both indoor and outdoor service.

Volumetric & Gravimetric Feeders

• Volumetric Screw Feeders & Conveyors — Vibra Screw’s core product line. Vibrating screw feeders use patented vibration of the screw and trough to fluidize material in the feed zone, eliminating the bridging and packing that cause conventional screw feeders to slug and surge. The result is significantly better volumetric accuracy than non-vibrating designs. Available in HD (heavy duty), standard, and sanitary configurations. Sizes from 1 inch to 24 inches in diameter. Handles free-flowing, cohesive, sticky, fibrous, and floodable materials that defeat conventional feeders.
• Versi Feeder — A compact, versatile volumetric feeder designed for applications requiring flexibility and easy product changeover. The Versi Feeder handles a wide range of dry bulk materials in a small footprint and is well-suited for pilot-scale, laboratory, and production applications where multiple materials are processed on the same equipment. Winner of Processing Magazine’s 2023 Product of the Year award.
• Versi Feeder VF-150 — An expanded-capacity version of the award-winning Versi Feeder platform, engineered for higher throughput production applications while retaining the flexibility and ease of changeover that makes the Versi Feeder family unique.
• Volumetric Belt Feeders — Belt-type volumetric feeders for materials that are best handled on a flat moving surface rather than in a screw. Ideal for fragile, sticky, or fibrous bulk materials that would be damaged or clogged by screw-type feeding mechanisms. Available in multiple belt widths and configurations.
• Weigh Feeders & Batchers (Loss-in-Weight) — Gravimetric loss-in-weight feeders that continuously measure the rate of material discharge and automatically adjust feeder speed to maintain the target feed rate regardless of changes in material bulk density, particle size, or flow characteristics. Delivers the highest level of feed rate accuracy for critical process applications in food, pharmaceutical, chemical, and plastics industries. Available in screw, belt, and vibratory configurations.
• Gravimetric Belt Feeders — Weigh-belt feeders for continuous gravimetric metering of bulk materials at high throughput rates. The material is weighed on a moving belt and feed rate is controlled by adjusting belt speed. Ideal for high-capacity applications in minerals, aggregate, cement, and industrial processing where continuous mass flow measurement is required.

Bulk Bag Handling

• Bulk Bag Unloaders — Complete bulk bag (FIBC / super sack) unloading systems that safely suspend, condition, and discharge bulk bags into downstream feeders, conveyors, or process equipment. Includes bag massage paddles or conditioning frames to break up compacted material before discharge, integrated dust containment, and connection to Vibra Screw bin activator or screw feeder for controlled discharge rate. Available in standard and sanitary configurations for food, pharmaceutical, and chemical applications.
• Bulk Bag Fillers — Semi-automatic and automatic bulk bag filling systems for filling empty FIBCs from process lines or storage. Incorporates bag inflation, fill-by-weight control, bag densification, and dust-tight connection to maintain housekeeping and product integrity during the filling process.

Conveyors

• Vibrating Conveyors — Vibrating trough conveyors for horizontal and slightly inclined transport of bulk materials without moving mechanical parts in contact with the product. Natural frequency or brute force designs available. Well-suited for hot, abrasive, sticky, or fragile materials that would damage or be damaged by conventional mechanical conveyors. Handles temperatures to 1,500°F for direct discharge from furnaces, kilns, and dryers.
• Spiral Conveyors — Vertical spiral vibratory conveyors for elevating bulk materials in a small floor footprint. Material travels upward along a helical trough path driven by vertical vibration. Ideal for applications requiring gentle vertical elevation of fragile materials such as food ingredients, tablets, capsules, and delicate granules where a bucket elevator or screw conveyor would cause unacceptable breakage.
• Flexible Conveyors — Flexible screw conveyors for routing bulk materials through tight spaces, around obstacles, and at variable angles without fixed ductwork or rigid conveyor structures. Ideal for filling machines, packaging lines, and process connections where conventional rigid conveyors cannot be installed.

Vibrating Screens & Blenders

• Vibrating Screens — Vibratory screening equipment for scalping oversized material, removing fines, and classifying bulk solids by particle size. Available in single-deck and multi-deck configurations for a range of screening applications in food, chemical, mineral, and industrial processing.
• Continuous Blenders — Continuous vibratory blending systems for homogeneous blending of two or more dry bulk ingredients without batch interruption. Gentle vibration promotes thorough mixing without degrading fragile particles or causing segregation of blended materials. Compact design for in-line installation between feeder and downstream process equipment.

Environmental Control & Pollution Control

• Environmental Control Systems — Vibra Screw systems for handling bulk solids generated in environmental and pollution control processes, including ash handling, biosolids processing, grit and screenings conveyance, and waste sludge management for municipal and industrial wastewater treatment facilities.
• Air & Water Treatment Equipment — Feeding and conveying systems for bulk chemical addition in air and water treatment applications, including activated carbon, lime, alum, ferric sulfate, polymer, and other treatment chemicals. Precise metering ensures accurate chemical dosing for effective treatment performance.

Industries Served

Vibra Screw equipment is trusted by processors worldwide — including ADM, Cargill, General Mills, Kellogg’s, Nestlé, Dow, DuPont, P&G, Pfizer, PPG, and scores of others — across a wide range of bulk solids processing industries:

• Food & Beverage — Flour, sugar, salt, starch, cocoa, spices, dried dairy, snack food ingredients, confections, bakery premixes, coffee, tea, pet food ingredients, food-grade bulk solids requiring sanitary construction and FSMA compliance
• Pet Food — Kibble, ingredient metering, bulk bag unloading, bin discharge for sticky and cohesive pet food ingredients
• Plastics & Polymers — Plastic pellets, powder, regrind, PVC, polyethylene, polypropylene, engineering resins, colorants, and compounding ingredients
• Chemicals — Industrial and specialty chemicals, pigments, dyes, detergents, fertilizer, resins, waxes, adhesives, and reactive or hygroscopic materials requiring enclosed handling
• Minerals & Mining — Silica, talc, calcium carbonate, titanium dioxide, alumina, potash, gypsum, coal, ore, and abrasive industrial minerals
• Agriculture — Grain, seed, animal feed, agricultural chemicals, fertilizer, starch, and dried agricultural products
• Pharmaceutical & Nutraceuticals — Active pharmaceutical ingredients, excipients, vitamins, supplements, botanical extracts, and other regulated bulk solids requiring sanitary, validated feeding and conveying systems
• Forest Products — Wood chips, sawdust, bark, paper fiber, and other fibrous or irregular bulk materials that challenge conventional mechanical handling equipment
• Environmental Control — Ash, biosolids, grit, screenings, lime, activated carbon, and bulk treatment chemicals for municipal and industrial environmental processing
• Rubber & Carbon Black — Carbon black, rubber compound ingredients, and polymer powders in rubber and tire manufacturing
• Aerospace & Defense — Specialized bulk solids applications for NASA, Northrop Grumman, Raytheon, Pratt & Whitney, and Rockwell — where precision metering and contamination control are paramount

Services

• Engineering / Design
• Trials / Test Lab
• Install / Commissioning
• System Integration
• Troubleshooting

PARTS

• Spare Parts
• Sub-Assembly Replacements
• Bin Activator Replacement Pans & Components
• Screw Feeder Augers, Troughs & Drives
• Belt Feeder Belts & Drive Components
• Vibrating Screen Media & Frame Components
• Bulk Bag Unloader & Filler Components