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Rarely, the resistor teeth are shortened, usually by half, to increase the capacity of
the press. Removing the teeth altogether will result in co-rotation and jamming.
Not infrequently the resistor teeth are drilled so that fluid can be injected into the press
during operation. See the next section.
KP RESISTOR BAR WITH THREE TEETH
FLUID INJECTION
Resistor teeth can be drilled to permit injection of steam, solvent or water while the
press is in operation. Also, these modified resistor teeth can be used for CIP
cleaning, without the need of removing the screen from the press.
Commonly alcohol injection is used to achieve in-line washing to remove sugars. Hot
water injection is used to recover dissolved solids in juice production. Steam injection is
used in dewatering raw organic materials.
The moisture reduction that results from steam injection is related to a chemical change
that comes with blanching, or parboiling, a material. Steam injection works well on
pineapple skin, citrus waste, and raw fish. Tests run with steam injection in a Vincent
press at Anheuser-Busch showed little benefit. The material being pressed, spent grain,
had already been "cooked" before steam was added.
Injection is achieved by drilling holes through the resistor teeth and piping these holes to a
manifold outside of the screen. Photos and drawings are available from the factory.
Vincent does not charge for providing a drilled resistor bar.
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