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Thayer Scale
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Thayer Scale thayer-logo www.thayerscale.com

Thayer Scale is the pioneering developer of continuous weighing and feeding equipment for the dry solids conveying and processing industries. Our equipment provides that rare combination of precision measurement and extreme reliability in a wide variety of industries and markets.

From forest products, steel and biofuels to snack foods, chemicals and plastics, Thayer Scale offers continuous and batch weighing solutions that are specially engineered for maximum performance. For 60 years, our innovative technologies, unique expertise and commitment to customer service have earned Thayer Scale a trusted reputation for providing the right equipment for every need.

Founded in 1949, Thayer Scale is a pioneering developer of continuous weighing and feeding equipment for the dry solids conveying and processing industries. Our conveyor belt scales and weigh feeders of both the weigh belt and loss-in-weight types, cover an extremely wide range of applications covering virtually all industries that involve dry solids conveying and processing. From loss-In-weight feeders that feed vitamins into cereals at rates below 1 pound per hour to 6-idler conveyor scales weighing coal at rates up to 10,000 tons per hour, there are more than 100 proven product variations available to suit most application requirements.

Thayer-Scale Produces:

  • Loss-In-Weight Feeders
  • Instrumentation
  • Volumetric Feeders
  • Weigh Belt Feeders
  • Conveyor Belt Scales
  • Material Flow Aids

For more information contact your M.C. Schroeder Sales Representative today.

PF-S Volumetric Powder Feeder
Feeds difficult powders such as Cabosil®, TiO2 and other pigments without bridging or clogging the hopper, or the screw.

Exclusive trough design; defeats flooding by dissipating kinetic energy of material stream at initial fill.

Agitator and screw overwind prevent material compaction or arching over screw flights. Feeder disassembles easily for total cleaning, eliminating contamination problems when changing materials,

Proven ability to feed difficult powders PF-S Volumetric Powder Feeder controls both flooding and clogging problems associated with difficult-to-handle powders. Unique feeder trough effectively de-aerates and contains the powder at the initial fill cycle to prevent flooding. Independently driven agitator maintains optimum material conditioning while screw speed can vary to control flow rate. Material does not build up within the continuous screw tube liner, preventing binding or erratic feed.

MH High Capacity Weigh Belt Feeder
Slack belt design for more stable accuracy

The MH belt is driven from the head pulley located at the outlet end of the feeder, rather than the tail pulley located at the end inlet. This permits lower belt tension during operation for better sensitivity and more stable accuracy. The head pulley is crowned to prevent belt tracking problems and is sheathed in rubber lagging to prevent belt slippage.

Inlet dimensions custom tailored
Ensures uniform withdrawal of material from storage. Very careful consideration is given to density, particle size and handling characteristics of your material.

Speed sensor mounted at idling tail pulley
Measures the true speed of the belt via rotation of the idling pulley, not an inferred belt speed based on motor speed. Belt slippage or breakage is immediately detected because the idling pulley stops rotating.

Scale outside material handling area
An idler supporting the belt (the “weigh” idler) transmits the load to the scale, which is located outside the weigh belt enclosure. This design has several benefits. The scale is not prone to damage, is out of the way for cleaning, and is not subject to tare build-up since material cannot fall onto the scale.

Feed Rate: 400 – 3,000 STPH
Particle Sizes: Fines up to 6″
Densities: 40-200 lbs/ft3

Automatic calibration
Thayer Scale’s optional automatic test weight mechanism provides a means for applying a precision test weight to allow completely automatic calibration. The calibration sequence can be initiated via the weigh belt instrument keypad or via a contact closure. The need for test chains is eliminated.

High accuracy, rugged measurement system 100% of the scale’s capacity is used to weigh material. Dead weight of the weigh idler and belt is mass-counterbalanced, thus providing excellent resolution and a high signal to noise ratio. Thayer Scale’s rugged load cell design assures reliable and accurate performance for the life of the weigh feeder.

Screw adjustable idler alignment
Thayer Scale’s “scale disturbance control” (SDC) system further enhances feeder performance by minimizing effects caused by occasional mechanical shocks or vibrations that would otherwise affect feed control.

Superior scale design and patented control algorithms assure reliable, accurate metering under harsh industrial conditions. 

The model 18L scale design provides high sensitivity to even the smallest weight changes. The measurement of weight loss is accomplished with a unique flexure scale system coupled to an accurate, very sensitive, high output electronic force measurement sensor. Feeder “dead” weight (weigh hopper, motor, speed reducer, etc.) is mass-counterbalanced so that material weight only is measured. This feature helps assure excellent control even in “noisy” environments.

Bridge Breaker® Material Flow Aids
Bridge Breaker® Design covered by U.S. and International Patents
Operation An expanded metal screen is mounted inside of and parallel to the hopper wall. The shaker supported frame is rigidly mounted to the screen through the use of two bolt and spacer assemblies. The bolts pass through elastomers sealing mounts which permit the screen to be actuated externally by the shaker assembly. A support bar welded to the hopper supports the shaker reaction spring and shaker assembly. The shaker which is air operated imparts a thrusting action to the screen with an amplitude (typically ±1/8”) which is effective in shearing or under-cutting material producing gravity flow. Quiet operation is assured.

Typical Installation
Bridge Breaker single material flow aids or multiple material flow aids can be used in common bins and chutes to prevent formation of rat holes or material bridging. Larger installation commonly require more than one flow aid, staggered in mounting height around the circumference of the outlet. Activation can be sequenced to create maximum, cascading effect.

THAYER Bridge Breaker® flow aids are custom manufactured to meet a particular bin configuration, type of material, or unique installation application. Bridge Breaker Screens come in a number of different configurations.