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SCC Screen Classifying Cutters


General Features:

  • Rapid throughout with minimum fines.
  • Advanced helical rotor design with interconnected parallelogram cutters.
  • Tungsten carbide replaceable cutter inserts.
  • Does not introduce heat — minimal heat introduction
  • Carbide offers extended wear life ~10x
  • High tolerance cut 5/1000ths to 7/1000ths of an inch between rotor knives and stationary bedknifes provides tight, controllable particle size range (tight bell curve)
  • Gravity or pneumatic discharge
  • Gravity or pinch-roll or conveyor feed
  • Sound deadening enclosures
  • Parallelogram cutters of heat-treated tool steel, and available with replaceable cutter inserts

Detailed Features:

    Broad Size Range

    SCC Screen Classifying Cutters are offered in five sizes with model numbers denoting length in inches of the feed throat opening. The width of the feed throat is 11 inches for all models.

    • SCC-10 (10 x 11-in)
    • SCC-15 (15 x 11-in)
    • SCC-30 (30 x 11-in)
    • SCC-48 (48 x 11-in)
    • SCC-60 (60 x 11-in)
    • SCC-72 (72 x 11-in)

    Parallelogram Cutters Minimize Power Requirements

    The SCC rotor assembly is comprised of inter-connected parallelogram cutters arranged in a progressive configuration to stagger the distribution of rotational torque. Whereas conventional knife cutters rely on a simultaneous cutting action over the entire length of the cutting knives, the staggered blades of the SCC cutter impart six times more force per inch at the instant of cutting than comparably sized knife-type cutters of equivalent horsepower, providing more thorough reduction of such hard-to-reduce materials as fiberglass, tough hydrocarbons, Aramid® fiber and fiber reinforced plastics.

    Parallelogram cutters are fabricated from a select grade of tool steel, and are heat-treated for greater strength and longer life. They can be sharpened in minutes with a minimal removal of material. To sharpen, the parallelograms may be stacked, thus allowing all to be sharpened simultaneously in a single operation.

    Proprietary Rotary Cutter Design

    • Proprietary, progressively staggered rotary cutter blade design
    • Parallelogram cutters of heat-treated tool steel, and available with replaceable cutter inserts
    • Cutter inserts mount into precision-machined locating slots on opposing ends of cutting blades.
    • Cutter blade inserts are available in, tungsten carbide, various grades of stainless steel and tool steel.
    • Inserts provide exceptionally long wear life in the most demanding applications.
    • Cutter inserts are easily replaceable via socket head tip retaining screws.
    • Staggered rotor blade arrangements may be changed for different process applications.
    • Cutting action occurs as carbide tips pass within thousandths of an inch of stationary knives.
    • Stationary bedknives precision machined of proprietary hardened steel material.
    • Rotor configuration produces an effective spiral cutter/feeding effect.
    • Design allows for high volume airflow through cutter.
    • Controllable particle size with minimal fines produced.

    Non-redundant Cutting

    Staggered cutting instantly creates a major granulated reduction of product that minimizes retention period within the cutting chamber and assists in reducing the percentage of fines. Thereby increasing the rate of throughput. Conventional knife cutters often shear product into strips that are retained until the knives can further reduce these strips.

    Spiral Feeding Effect

    The parallelograms are pre-drilled and self-aligning. Their cutting sequence creates a natural spiral feeding effect, moving the material from the ends of the cutting area and toward the center. This action greatly reduces the possibility of material becoming trapped between the shaft and end plates. If desired, the parallelograms may be arranged to feed the material in a right-hand or left-hand direction within the cutter, or in a non-directional, intermittent fashion.

    Stationary Bed Knives

    Bed knives are secured to solid anvils to prevent movement. Bed knives feature reversible cutting edges that double their functional life. They are easily accessible from the outside of the cutter housing for quick removal or adjusting. The bed knives are adjustable to compensate for sharpening and wear on the parallelogram cutters.

    Bedscreen Size Determines Finished Output

    Munson can furnish classifying screens in a variety of sizes to suit customer requirements. The screens are available with round perforations from 1/32" to 1½" diameter, and with special square perforations (typically for fiberglass) on request. Screens are held securely in place by a quick-release support mechanism for rapid removal and replacement.

    Product Infeed

    • Materials gravity fed through the intake hopper, or fed horizontally
    • Vertical feed via double baffled feed hopper with adjustable baffle
    • Material may be fed directly into the front of the hopper or though a hinged top door
    • Horizontal product feed is accomplished through an independently powered, variable speed pinch roll feeder
    • Special feed chutes are available per application requirements
    • Available mechanical and powered product feeding mechanisms tailored to application requirements
    • Vibratory feeders available to regulate input of granular material

    Product Discharge

    • Product discharge may be via gravity, pneumatic transition or independently powered belt or screw conveyor.
    • Systems can include integral pneumatic discharge transition for rapid removal of reduced product.

    Drive Arrangements

    • Standard cutter drive is via a common support base mounted multiple V-belt drive motor
    • Direct-coupled drive and gear reduced drives available per request
    • Cutter drive may be equipped with an electrical or a mechanical variable speed provision
    • Rotor speed operating range is between 30 - 3600 RPM'S, depending on application
    • All drives are furnished with totally enclosed guarding
    • Variable speed drives also available


    • Heavy duty welded and bolted, reinforced plate steel construction
    • Available in carbon steel, abrasion resistant steel and various grades of stainless steel
    • Easily accessible, anvil supported front and rear adjustable bedknives have reversible cutting edges
    • 180 Product classifying bedscreens are available in a broad size range
    • Bedscreen easily replaceable and supported by heavy duty cradle
    • Outboard mounted, flange block roller bearing assemblies available with various shaft seal designs
    • Rotor shaft supported by self-aligning, sealed ball bearings
    • Entire rotor assembly is easily removable with the use of a shaft extension
    • Rugged precision machined steel weldment encompasses the unique rotor assembly, providing an unyielding framework from which combined internal forces can reduce product throughput