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Powder and Granular Material Feeder,
Circle Feeder® Registered trademark in 45 countries

Powder and Granular Material Feeder,
Circle Feeder® Registered trademark in 45 countries

Test Service

YOSHIKAWA sees no limit to the possibilities.

Powders can be extremely difficult to handle. There are countless factors in powders that can cause problems, including differences in properties arising from production locations and processes, changes in characteristics and cohesion caused by humidity, varieties in shape and bulk density, as well as mixed products of different powders having unique characteristics. 

Changes in characteristics that are particular to each feeder or the shape of the hopper are also important factors to be considered.

At Yoshikawa, we provide a variety of feeders, hoppers and measuring instruments to carry out more than 200 tests yearly, using the actual powdered materials to be fed, to determine the ideal feeder specifications.

Testing Environment

  • Test Room  327 square meters
  • Feeders and hoppers
  • A wide variety of feeders, from 100 to 6000 mm in inlet diameter, are available for testing. 
  • Batch measuring unit
  • Loss-in-weight feeding test equipment
  • Flocculant dissolution unit 
  • Local dust collector

Risk can be minimized by conducting prior discharge tests.

Powdered Material Testing Service

We conduct various tests with materials received from our customers.
Presence/absence of bridging and/or segregation, and feeding accuracy can be confirmed with the actual powdered material.
If you have a material you want tested, contact us via this site.
If the material to be tested cannot be taken outside your site, please consult with us. 


We also accept inquiries by phone or fax.

Phone inquiry hours:
8:30 a.m. to 5:00 p.m. Japan time (except Saturdays and Sundays)
Fax inquiries can be received at any hour.