A Buyer's Guide to Rectangular Vibratory Screeners

What Is a Rectangular Vibratory Screener?

A rectangular vibratory screener is a bulk material screening machine with a rectangular screening deck — as opposed to the circular deck of a round vibratory separator. The screener's frame, drive assembly, and deck are all oriented in a rectangular footprint, typically oriented so that material enters at one end (the feed end) and exits at the opposite end (the discharge end) after passing over or through the screen surface.

Rectangular screeners use vibratory motion to accomplish two simultaneous objectives: stratifying the material so that undersized particles migrate toward the screen surface, and conveying the material across the screen deck so that it moves from feed to discharge while the separation occurs. The specific motion pattern — linear, circular, elliptical, or variable — determines how effectively the machine accomplishes each of these objectives for a given material and application.

Rectangular screeners are manufactured in a wide range of sizes, from small single-deck units with a 2-foot by 4-foot screening area to massive multi-deck vibrating screens used in open-pit mining operations with deck areas exceeding 200 square feet. The same fundamental operating principle applies across this entire size range: vibratory motion separates and conveys the material across a permeable screen surface that passes undersize material while retaining oversize material for separate discharge.

Major rectangular screener manufacturers include Cleveland Vibratory, Midwestern Industries, General Kinematics, SWECO (for their rectangular line), Derrick Corporation, and dozens of international suppliers for mining-scale equipment. ScreenerKing supplies replacement screen media compatible with many of these machines, allowing owners to reduce ongoing screen costs without sacrificing separation performance.

How Rectangular Screeners Differ from Round Separators

Motion Pattern

Round vibratory separators use a single vibratory motor with counterweights mounted on the motor shaft to produce a three-dimensional, spiraling motion — the material traces an outward spiral from the center of the deck to the periphery. This spiral motion is very effective for powder classification and check screening, but it does not produce the directional conveying action needed for high-volume or linear-flow applications.

Rectangular screeners use either a linear motion (from twin counter-rotating motors or an eccentric shaft drive) or a circular/elliptical motion (from a single eccentric shaft). These motions produce a directed conveying action along the length of the deck, moving material from feed to discharge in a controlled, measurable manner. This conveying action is why rectangular machines can handle dramatically higher throughput rates than round separators of comparable screen area.

Throughput Capacity

A 30-inch round separator (approximately 4.9 square feet of screen area) might handle 2,000 to 5,000 pounds per hour for a medium-difficulty dry separation. A 5-foot by 10-foot rectangular screener (50 square feet of screen area) running the same material at the same cut point could handle 20,000 to 80,000 pounds per hour — 10 to 40 times more throughput at roughly 10 times the screen area. The conveying efficiency of rectangular motion means that capacity scales more favorably with screen area in rectangular machines than in round ones.

Footprint and Installation

Round separators are compact and fit neatly into circular footprints with relatively small floor space requirements. A 30-inch round separator occupies less than 8 square feet of floor space. Rectangular screeners are physically larger and require more floor space, installation headroom for screens to be changed from above or the side, and structural support for higher operating weights and dynamic forces. Installation complexity and cost are significantly higher for rectangular machines.

Deck Orientation

Round separators are typically oriented horizontally (flat). Rectangular screeners can be horizontal, inclined (typically 15 to 30 degrees), or — in the case of banana screens — multi-slope with variable angles across the deck length. Inclination affects material velocity across the deck, screening efficiency, and capacity.

Types of Rectangular Screeners

Linear Motion Screeners

Linear motion screeners use two vibratory motors mounted on the screen body in counter-rotating configuration, or a single exciter shaft with counterweights arranged to produce a linear throw. The vibration is directed along a single axis — typically at an angle of 45 to 60 degrees from horizontal, which simultaneously lifts and propels material in a consistent direction. Linear motion screeners are the most widely used type in industrial and mineral processing, valued for their controllable material velocity, effective dewatering performance, and suitability for wet or sticky materials. They are the preferred choice for sand classification, coal dewatering, and food-grade scalping applications.

Circular Motion Screeners (Single Shaft)

Circular motion screeners use a single eccentric shaft to produce a circular or slightly elliptical vibration pattern. At the feed end of the deck, the circular motion lifts and aggressively stratifies the incoming material. At the discharge end, the material has spread into a thinner layer and the circular motion helps fine particles find screen openings. Circular motion machines are well suited for dry classification of granular materials. They are simpler mechanically than linear motion machines (one shaft vs. two motors) but provide less control over material velocity.

Banana Screens (Multi-Slope)

Banana screens — named for their curved side profile — feature a deck with multiple inclined sections that decrease in angle from feed to discharge (e.g., 40 degrees at the feed end, stepping down to 15 degrees at the discharge end). At the steep feed-end section, high material velocity and thin bed depth allow rapid initial stratification and sizing. As material moves to progressively less-inclined sections, velocity slows and more precise near-size separation occurs. Banana screens achieve very high throughput per unit of screen area — 2 to 3 times that of conventional inclined screens — and are used extensively in coal and mineral processing. They require more headroom than conventional machines due to their geometry.

Horizontal Screeners

Horizontal rectangular screeners operate with a flat (0-degree) deck orientation. Without gravity assist from inclination, these machines rely entirely on the vibration energy to convey material and achieve separation. Horizontal machines have a smaller installation height requirement than inclined machines and are useful when headroom is limited. They are commonly used in food and pharmaceutical processing, where a sanitary horizontal design is required, and in recycling applications where a controlled, gentle material path is needed.

Key Specifications to Understand

Deck Dimensions: Width and Length

Screening area is the product of deck width and deck length. Width is typically the space-constrained dimension — standard widths range from 24 inches to 120 inches (2 to 10 feet) in industrial applications, with mining machines reaching 240 inches (20 feet). Deck length determines residence time on the screen; longer decks provide more opportunity for near-size particles to find openings, improving efficiency but requiring more floor space. Standard length-to-width ratios range from 2:1 to 3:1 for most applications.

Number of Decks

Single-deck machines make one cut, producing two fractions (oversize and undersize). Two-deck machines make two cuts, producing three fractions. Three-deck machines produce four fractions. Each additional deck adds weight, complexity, and cost, but reduces the number of machines needed to achieve multiple separations. Stacked multi-deck configurations require adequate structural support and must be designed to ensure the vibration energy is effectively transmitted to all decks.

Amplitude and Frequency

Amplitude is the peak-to-peak displacement of the screen deck during vibration, typically measured in millimeters. Frequency is the number of vibration cycles per second or minute (expressed as strokes per minute or Hz). The product of amplitude and frequency determines the acceleration experienced by the material on the deck. Most industrial rectangular screeners operate at frequencies of 900 to 1,800 strokes per minute (15 to 30 Hz) with amplitudes of 3 to 12 mm. Higher frequency with lower amplitude favors fine separation and longer screen life; lower frequency with higher amplitude favors coarse, high-tonnage applications.

Throw Angle

In linear motion screeners, the throw angle is the angle of the vibration stroke relative to the deck surface. Typical throw angles are 45 to 60 degrees. A steeper throw angle (closer to 60 degrees) projects material higher off the screen surface and reduces material velocity across the deck, increasing residence time and separation efficiency at the cost of throughput. A shallower angle (closer to 45 degrees) increases material conveyance speed and throughput at the cost of some separation efficiency.

Deck Inclination Angle

Inclined screeners typically operate at 15 to 25 degrees. Steeper inclinations increase material velocity and throughput while reducing residence time and separation efficiency. Flatter inclinations have the opposite effect. Banana screens vary inclination across the deck length, optimizing both throughput and efficiency simultaneously.

Common Applications for Rectangular Screeners

Note that round vibratory separators remain the better choice for fine powder classification (sub-100 mesh), check screening in pharmaceutical and food applications, and lower-throughput applications where their compact footprint and lower cost are advantages. See our complete vibratory screener selection guide for a full comparison of machine types.

Sizing a Rectangular Screener: Width × Length vs. Capacity

Sizing a rectangular screener correctly is critical to achieving target throughput and separation efficiency. Undersizing results in poor efficiency, high near-size contamination in your product, and excessive wear on the screen media. Oversizing wastes capital and floor space.

The Unit Capacity Method

The most common approach to rectangular screener sizing is the unit capacity method, which uses empirical data for your material type and cut point to determine the required screen area:

Base unit capacity values from industry tables typically range as follows:

• Coarse, easy-to-screen dry material (e.g., clean aggregate, 3/4" to 2" cut): 3.0 to 6.0 tph/ft²
• Medium-difficulty dry material (e.g., limestone, 1/4" cut): 1.5 to 3.0 tph/ft²
• Fine, difficult dry separation (e.g., 28 mesh silica sand): 0.5 to 1.5 tph/ft²
• Wet screening (e.g., sand and gravel, 1/8" cut): 1.0 to 3.0 tph/ft²

Correction factors adjust the base capacity for actual operating conditions: the percentage of oversize in the feed, the percentage of half-size material (near-size particles within 75% of the opening size), moisture content, deck position (upper decks process more cleanly), required efficiency, and material bulk density.

Worked Example

Scenario: You need to scalp oversize from 80 tph of dry limestone at a 1/4-inch cut point. Feed contains 15% oversize, 20% half-size material. Required efficiency: 85%.

Base unit capacity for 1/4" limestone cut: 2.0 tph/ft²

Correction factors (approximate): half-size factor 0.85, efficiency factor 0.95 = combined factor 0.81

Corrected capacity: 2.0 × 0.81 = 1.62 tph/ft²

Required area: 80 tph ÷ 1.62 tph/ft² = 49.4 ft²

Select a standard 5-foot × 10-foot single-deck screener (50 ft²), which meets the required area with a small safety margin.

This is a simplified example. For critical applications, work with the application engineering team at Cleveland Vibratory, Midwestern Industries, or another reputable supplier to develop a complete sizing calculation using their proprietary capacity data for your specific material and conditions.

Screen Media Options for Rectangular Screeners

Woven Wire Mesh

Woven wire cloth is the most versatile screen media and is available in the widest range of aperture sizes — from 4-inch coarse mesh down to 400 mesh (38 micron) for ultra-fine applications. Woven wire is manufactured from carbon steel, 304 stainless steel, 316 stainless steel, T430 stainless steel, manganese steel, and other alloys depending on the application requirements.

For food, pharmaceutical, or chemical applications, 316 stainless steel woven wire provides corrosion resistance in aggressive environments including salt, acids, and cleaning chemicals. 304 stainless steel is the standard choice for most sanitary or moderate-corrosion applications. T430 stainless steel is used in applications where magnetic properties are needed for contamination detection systems.

Woven wire wear life in abrasive applications is the main limitation. High-silica or abrasive minerals can wear through woven wire in as little as 2 to 4 weeks, making polyurethane or rubber the better choice for those conditions.

Polyurethane Screen Panels

Polyurethane screen panels offer dramatically longer wear life than woven wire in abrasive, wet applications. Typical polyurethane life in sand and gravel screening is 5 to 10 times longer than woven wire. Polyurethane panels are modular — typically 305mm × 305mm or 305mm × 610mm — and snap or bolt into a support frame on the deck. The modular design allows individual worn panels to be replaced without replacing the entire screen surface.

The tradeoff for polyurethane's wear resistance is reduced open area — polyurethane panels typically have 25 to 40% open area compared to 45 to 60% for woven wire with comparable opening sizes. This reduces effective capacity per unit of screen area. Polyurethane panels are also limited in the fine sizes they can achieve; most polyurethane panel suppliers do not offer panels below approximately 1 mm opening size.

Rubber Screen Panels

Rubber screen panels function similarly to polyurethane but offer even greater flexibility, which makes them excellent for wet, sticky, or near-size applications where blinding and pegging are significant problems. The rubber flexes with each vibration cycle, dislodging particles that would blind or peg a rigid screen. Rubber is also the most impact-resistant option, making it appropriate for coarse, heavy-impact applications such as ROM ore scalping.

Rubber's lower stiffness means it is not suitable for fine separations where precise aperture size control is required.

Perforated Plate

Perforated steel or stainless steel plate is used for coarse scalping applications where opening sizes are 1/4 inch and larger, and where extremely high material impact loads would damage wire or panel media. Perforated plate offers very long wear life in the right application, but its relatively low open area (typically 25 to 50% depending on hole pattern) limits capacity compared to woven wire. It is commonly used as the top scalping deck on multi-deck machines in mining and quarrying.

Rectangular Screener Brands and What ScreenerKing Replaces

The rectangular vibratory screener market includes a wide range of domestic and international manufacturers. Understanding the major brands and their screen media systems helps you evaluate aftermarket screen availability before you buy.

Cleveland Vibratory Company

Cleveland Vibratory is one of the most respected names in U.S. industrial screening, manufacturing both round and rectangular vibratory equipment. Their horizontal and inclined rectangular screeners are used widely in chemical, food, and industrial processing applications. ScreenerKing supplies replacement woven wire screen media compatible with Cleveland Vibratory rectangular screeners in standard deck dimensions.

Midwestern Industries

Midwestern Industries manufactures a broad line of rectangular vibratory screeners alongside their well-known round separator line. Their EZ-SCREEN and SCREENER-KING rectangular units are used in grain, food, chemical, and industrial applications. Midwestern's commitment to accessible, practical screening solutions is reflected in their equipment design, and ScreenerKing replacement screens are a natural complement to their installed base.

General Kinematics

General Kinematics specializes in two-mass and brute-force vibratory equipment for heavy industrial applications including mining, foundry, and recycling. Their rectangular screens are found in demanding, high-throughput environments. Screen media for GK equipment tends to be application-engineered — consult ScreenerKing's application team for media compatibility.

Sweco

SWECO, best known for their round vibratory separators, also manufactures rectangular screeners under their SWECO VIBRO-ENERGY and related product lines. Their rectangular equipment is found primarily in chemical and industrial applications. ScreenerKing is familiar with SWECO screen media specifications and offers compatible woven wire replacements for many SWECO rectangular deck sizes.

Derrick Corporation

Derrick Corporation specializes in high-frequency fine screening equipment, including their well-known Stack Sizer and Hyperpool series. These machines use very fine woven wire or urethane panels at high frequency for ultra-fine wet separations in mining. Screen media for Derrick equipment is highly specialized — ScreenerKing can advise on compatible woven wire options for applicable Derrick deck sizes.

What to Ask Before You Buy

The following 10 questions will reveal whether a supplier is the right partner for your rectangular screener purchase and help you avoid costly specification errors.

Red Flags When Evaluating Rectangular Screeners

Beyond the questions above, the following specific red flags should cause you to pause or reconsider a supplier or machine:

• No application engineering support. Rectangular screener sizing is not a catalog exercise. A supplier who quotes a machine based only on your throughput number without asking about material properties, cut point, feed size distribution, moisture, or operating conditions is not doing adequate engineering.
• Proprietary screen media with no alternative supply. If the supplier's screen panels are a unique format available only from them, you are locked into their pricing for the life of the machine. This is a significant TCO exposure, especially if their pricing increases or their supply chain is disrupted.
• Underpowered exciter drives. Some suppliers spec the minimum motor size to hit a price point. Verify that the drive power is appropriate for your material bulk density and throughput — underpowered drives lead to poor separation and premature bearing failure.
• Thin side plate construction. Side plates are the primary structural element of a rectangular screener. Request the side plate thickness and material specification. Light-gauge fabrications (under 10mm for industrial machines) are a false economy that leads to early fatigue cracking.
• No isolation system or inadequate isolation specification. Rectangular screeners must be mounted on proper vibration isolation springs or rubber mounts to protect the supporting structure and prevent vibration transmission. A quote that does not include isolation components or specify their design load is incomplete.
• Unrealistically long delivery quotes that do not include commissioning. If the delivery timeline does not include factory acceptance testing (FAT) and on-site commissioning support, you may be responsible for troubleshooting a new machine yourself.

Rectangular Screener Buyer's Guide FAQs