Dispersing Impellers:

Generally speaking, a dispersing blade is a blade that fits onto a disperser which is built to run at high speeds forming a vortex and creating shear on the surface of the blade. The blades are flat and bolt onto the shaft using a center bore with pins/bolts or a center bore with keyway sandwiched between stiffening plates.  They can be found with welded collars and set screws but this can be very dangerous. They can be found with center bores and no pins or no keyway but they can then spin unless there is a strong compression plate type fitting or reverse threads. Polyblades still require stiffening plates to prevent the bolt holes from stretching.  However, urethane blades can be cast with a metal plate in the center eliminating the need for external plates.  The Polyblade is bi-directional and can be flipped over when the following edge of the scooped has gone from a 90 degree angle to a 45 degree angle. ALL Polyblades have this advantage. In addition, Polyblades never get sharp and do not need extra caution and Blade Guardians when not in use.

For more detailed information on this subject, please visit the Education & Information section.

Accessories for Dispersing Blades:

  • Stiffening plates are needed for steel blades to delay fatigue caused by a fluttering effect when the shaft is running at high speeds;
  • Stiffening plates are needed for plastic blades to prevent the holes and/or keyway from stretching;
  • Blade guards should be used for stationary steel impellers to prevent personnel from getting cut or always have the idle blade in an empty drum or tank;

For a quote or discussion, complete the IMPELLER BLADE SPECIFICATION FORM.

POLYBLADES, Polymer Dispersing Impellers: Type 7 Norstone Polyblade

The Polyblade impeller is the answer to the negative issues which are inherent in metal blades when dispersing certain types of slurries. Polyblades still require stiffening plates to prevent the bolt holes from stretching.  However, urethane blades can be cast with a metal plate in the center eliminating the need for external plates.  The Polyblade is bi-directional and can be flipped over when the following edge of the scoop has gone from a 90 degree angle to a 45 degree angle. ALL Polyblades have this advantage. In addition, Polyblades never get sharp, do not need extra caution when handling and/or Blade Guardians when not in use. It is constructed from a wide variety of polymers depending upon the application:

Originally designed for abrasive products and products sensitive to metal contamination. However, safety feature, long life, double sided use and versatility in materials of construction led to the development of impellers that can be used in a variety of industries including chemicals,solvents, FDA, pharmaceuticals, electronics as some of the examples.

  • Polyurethane for maximum abrasion resistance in a non-solvent slurry;
  • Anti-static polyethylene for solvent slurries;
  • PTFE for high temperature and harsh chemical slurries;
  • Nylon for chemical resistance;
  • Polypropylene for low cost applications;
  • Polypropylene & Nylon for FDA and Pharmaceutical applications;
  • Available sizes range from 1″ up to 40”

Features of the Polyblade: Abrasion Resistance; Safety; Low Heat; Low Maintenance; No metal contamination; Dual Sided; Won’t Bend or Deform; High Value. This unique design improves production time first by efficiently incorporating powders into the batch with its pumping ability.  The pumping continues to turn over the liquid/solid material so that the slurry sees the shear zone of the blade more frequently than with any other impeller styles. The batch will run cooler with the end to end radius scoop on the original design. Lightweight materials are more easily incorporated. Heavy settling material is lifted off the bottom. This blade cannot be put on backwards. Best of all this blade never gets sharp and so a safety hazard is removed from the plant or lab.

Type 7STD: Original design, Scoops only

  • High shear with excellent pumping
  • May run louder than steel blades
  • Far outlast steel blades – no teeth to bend, stays rigid, dual sided
  • Requires plates to prevent the holes from stretching
  • Available in many materials of construction but primarily in urethane and anti-static ultra high molecular polyethylene
  • Runs cooler than steel blades and competitive polymer blades due to its end-to-end radius scoop
  • External stiffening plates are required;
  • The blade is thick but can be counterbored and drilled to fill all shaft configurations;
  • All Polyblades can have hubs attached to them for mounting mid-way on shaft
  • 4000-4500 fpm tip speed

Type 7STD Original Polyblade in Cast Urethane

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Type 7STD Original Polyblade Anti-Static Polyethylene

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URETHANE TYPE 7STD: BLADE CONFIGURATIONS: TYPE 7STR/RP – TYPE 7EP

  • These designations apply to urethane blades only
  • STR: Soft Tear Resistant blades are made with a softer abrasion and tear resistant urethane throughout. This formulation requires an internal plate for blades 14” diameter and larger.  External stiffening plates are required if no internal plate is present.
  • STR/RP: Soft Tear Resistant made with  a ¼” thick internal plate. External stiffening plates may still be required for blades 18” and larger unless an internal plate of ½” or thicker is present.
  • EP: Soft Tear Resistant made with ½” – 5/8” thick internal plate either round or clover shaped depending on blade size. External stiffening plates are NOT required if blade has the following internal plate:
    ¼” thick plate  6” – 16” diameter blade
    3/8” thick plate  12” – 18” diameter blade
    ½” thick plate  16” – 20” diameter blade
    5/8” thick plate  20” – 32” diameter blade

Type 7EP: POLYBLADE with Embedded Plate

  • Cast Polyurethane Blades can have a REINFORCED plate embedded into the blade for improved stiffness eliminating the requirement for external plates;
  • No Stiffening Plates are Required;
  • The internal plates can be precision machined or dynamically balanced for safe machine operation at high speeds;
  • This design eliminates all metal exposure;
  • The internal plate is a one piece assembly which is especially helpful in confined space entry situations;
  • Round Plates for smaller sizes and Clover Plate for larger sizes due to increased torque.

Type 7EP Original Polyblade with Clover Embedded Plate, larger sizes

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Type 7EP Original Polyblade with Round Embedded Plate, smaller sizes

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Type 7 DHS-EP Urethane Diamond Shaped Teeth, Spoked Plate

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Type 7SP: POLYBLADE with Turbo Pegs

  • (3) Square Turbo Pegs on the perimeter in between scoops added to both sides to increase the cutting ability of the blade;
  • Option for the stiffening plate molded into the blade eliminating the need for stiffening plates (see Type 7EP)
  • Bi-Directional
  • Pegs improve dispersion in higher viscosities
  • Pegs may cause splashing in low viscosities
  • 4000-4500 fpm tip speed

The Blade Depot has the ability to customize the Polyblade designs to make them more or less aggressive, to make them pump more or less, and/or make them run cooler or hotter.  Contact us for your specific needs if you don’t find the answer in our standard selections

7EP-SP Urethane Polyblade with Embedded Plate and Turbo Pegs

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Type 7SP-AS Anti-Static Turbo Polyblade

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Type 7HS: Polyblade with High Shear Teeth & Scoops

The most aggressive Polyblade style available with scoops and teeth.  Never gets sharp, reversible, and long lasting.  Currently available in all materials.  Only needed when extremely difficult agglomerates are present or the blade cannot be raised to one full blade diameter off the bottom.
Stiffening plates must be used. Embedded plates are available with the urethane blades.

  • Newest design for maximum cutting and pumping power
  • Options for 0, 3, 6 or 9 scoops to determine level of pumping
  • Options for 2 or 3 teeth in between the scoops to determine grinding efficiency
  • Options for Diamond, Wedge or Bowtie teeth on all blades except urethane (Diamond only)
  • Options for 7HS-LF, high shear laminar flow with no scoops but additional option for teeth on the perimeter
  • Doesn’t sharpen with use
  • Bi-directional
  • Excellent for a wide range of viscosities
  • Available in a wide range of materials
  • Requires stiffening plates
  • 3500-5000 fpm tip speed depending on desired results
  • Free 30 day trial

Available Configuration for the Type 7 HS Blade

Type 7 WHS Made with Taller Teeth for Difficult to Grind Products

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Type 7DHS: Diamond Shaped Teeth

  • Diamond shaped teeth in between scoops
  • 6/3:  6 scoops with 3 teeth in between, 4800-5300 fpm
  • 9/2  9 scoops with 2 teeth in between, 4500-5000 fpm
  • More aggressive than standard Polyblade
  • Similar shear to Type 1 & Type 6 with more pumping
  • Available in UHMW and cast urethane

Type 7 DHS 9-2 Anti-Static Polyblade with Diamond Shaped Teeth, 9 scoops & 2 teeth in between each scoop for higher pumping

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Type 7 DHS 6-3 Anti-Static Polyblade with Diamond Shaped Teeth, 6 scoops & 3 teeth in between each scoop for more aggressive shearing

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TYPE 7EPDHS/TP: DHS DESIGN IN ABRASION RESISTANT URETHANE

  • Diamond shaped teeth & Turbo Pegs in between scoops
  • (3) set of 2 scoops set evenly around blade
  • (3) diamond shaped teeth between each set of scoops
  • (1) turbo peg in between each pair of scoops
  • Internal Clover shaped stiffening plate
  • External plate design also available
  • Turbo Pegs can be eliminated as an option
  • Not available in all sizes
  • More aggressive than standard Polyblade
  • More abrasion resistant than AntiStatic UHMW
  • Similar shear and pumping to Type 11 but dual sided and lasts longer

T7 DHS-TP-EP with Clover Plate

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Type 7WHS: Wedge Shaped Teeth

  • Wedge shaped teeth in between scoops
  • 6/3:  6 scoops with 3 teeth in between, 4800-5300 fpm
  • 9/2  9 scoops with 2 teeth in between, 4500-5000 fpm
  • Most aggressive of the Polyblades
  • Maximum shear with pumping for hard to grind products and high viscosities
  • Generates heat fast

Type 7 WHS Anti-Static Polyblade with Wedge Shaped Teeth

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Type 7BHS: Bowtie Shaped Teeth

  • Specialty blade for large agglomerates that don’t break down with shear
  • Bowtie shaped teeth in between scoops
  • 6/3:  6 scoops with 3 teeth in between, 4800-5300 fpm
  • 9/2  9 scoops with 2 teeth in between, 4500-5000 fpm
  • Maximum disruption of a batch sometimes needed in an emulsion
  • Good for breaking chunks

T7 BTHS Anti-Static Polyblade with Bowtie Shaped Teeth which can be made beefier

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Type 7LF Diamond Shaped Teeth with no scoops, option for teeth on the perimeter

  • Diamond shaped teeth on top, bottom and/or perimeter
  • No scoops
  • 6/3:  6 spaces with 3 teeth in between
  • 9/2  9 spaces with 2 teeth in between
  • Should be operated at 5700+ fpm
  • Use when high shear or homogenization is required and pumping is not needed or detrimental

Type 7 LF-DHS+ Laminar Flow Blade with Diamond Shaped Teeth on Perimeter

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Type7 LF-DHS Laminar Flow Blade Diamond Teeth, no scoops

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Type 7OS Single Sided Polyblade, any style

  • Purpose is to reduce the amount of air entrained in the batch;
  • Flat side up; Scoops & Teeth face down;
  • Available in any size;
  • Available in any material.

Type 7OS One Sided Polyblade, any configuration, for less air incorporation

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MIXING IMPELLERS

Generally speaking, a mixing blade is a blade that fits onto a mixer which runs at low speed up to 3000 rpm

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Metal Dispersing Impellers

There are many different styles of the sawtooth type dispersing blade. Some differences are subtle and may make a difference depending upon the product’s characteristics.

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Laboratory Impellers

Most of the styles found in both the Mixing and Dispersing sections are available in laboratory size.  Some start as small as 1” while others will be 1.5” or 2.0” depending on the style.

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ACCESSORIES

There are a few accessories for dispersing impellers that are critical for the impellers to run correctly and/or operate safely.

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DESCRIPTIONS

 

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