How the Chip-sizer™ Advances Rechipper Technology
Oversize chips do not completely "cook" and are either burned along with entrained chemicals or re-circulated:
- Pins and fines result in lower tear and burst strengths and clog digester screens
- Increases in coarse particle content leads to increased tensile energy absorption (TEA)
The Jeffrey Rader Chip-sizer Adds More Value to Oversize Chips
- "Overs" account for between 3% and 15% of total chip production in a typical application
- Nearly all the fiber in “overs” is usable when rechipped with the Chip-sizer
- Chips are more valuable in pulp than as boiler fuel
The Secret to Efficient Chip-sizing
The Jeffrey Rader Chip-sizer fractures chips along fiber lines.
The Chip-sizer reduces shear perpendicular to the grain. Shear perpendicular to the grain is the main cause of fines in other rechippers.
The most significant issue in designing the Jeffrey Rader Chip-sizer rechipper was to reduce the chips and generate low levels of pins and fines. To accomplish this, Jeffrey Rader borrowed technology from its coal crushers where minimizing fines is essential.
Jeffrey Rader’s Chip-sizer hammers are in effect a cross between swing and fixed hammers, in that each hammer swings on one bar but a second bar limits how far it extends from the rotor. It extends to a point much less than perpendicular to the rotor and more easily "floats" away from the material on impact, giving a "soft touch" that minimizes pins and fines.
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The Chip-sizer hammers also permit the rotor to turn at lower RPM than in a typical hammermill because their unique shape reduces the centrifugal force required to extend them.
In addition to impact with the hammers, the oversize chips are reduced in the action between the hammers and screen grates.
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The special Chip-sizer rechipper grates utilize Jeffrey Rader’s Slant-Flow™ technology, with the bars inclined into the direction of material flow and having a beveled edge. The net effect of the special hammers and grates is that chips are fractured along fiber lines. This maintains acceptable fiber lengths and minimizes production of fines.
For More Online Information about the Chip-sizer Rechipper
Download the Jeffrey Rader Chip Sizer Brochure
For more information on the Chip-sizer rechipper, including dimensions and specifications, download our free Chip-sizer Brochure (PDF - requires registration).
Support for your Jeffrey Rader Chip-sizers
For the best performance and longest wear, order your Chip-sizer parts from Jeffrey Rader, and count on Jeffrey Rader Technical Services for field service, training and repairs.
Ask a Question about the Chip-sizer
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Use our online form to request a quote for the Chip-sizer or other Jeffrey Rader equipment. |
