Screw Press Description | Vincent Corp

The function of a screw press is to dewater various materials by using a rotating screw within a perforated cylinder. This mechanism forces the liquid out through the cylinder walls, with the remaining solid matter being discharged from the opposite end. Vincent Corp offers a horizontal continuous press that is particularly efficient for this purpose.

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Design and Functionality

Graduated Pitch Screw

The press features screws ranging from 4" to 30" in diameter with a graduated pitch, interrupted flight design that works with stationary resistor teeth. These teeth ensure the material does not rotate with the screw and is mixed efficiently, exposing more material to the screening surface.

Compression Process

The material is gradually compressed as it moves through the main screen cylinder, with liquid being forced through the screen perforations. The cone system at the discharge end provides the final pressing action. This system is adjustable to optimize resistance for better dewatering.

Special Features

The frustum design near the discharge point enhances final pressing action. The cone assembly is actuated using air cylinders, springs, or counterweights, depending on the model.

Capacity

The capacity of the Vincent Continuous Screw Press depends on the bulk density and slippage characteristic of the material. Adjusting the cone pressure can vary the capacity and the amount of water removed. The high capacity and low horsepower requirement are among its key advantages.

Screens

The screens are easily accessible for cleaning and maintenance, available in various arrangements and perforation sizes. Wedge wire screens with slots ranging from 0.012" to 0.030" are common.

Maintenance

The Vincent press is known for its low maintenance costs, facilitated by easy access to components and the use of off-the-shelf parts. Its all-fabricated steel design allows for in-plant repairs if necessary.

Materials of Construction

• H style: Carbon steel with stainless steel screening, covers, and drain pans.
• P style: Type 304 stainless steel covers, drain pans, perforated screening, and screw-spindle assembly.
• K style: All contact parts made of Type 304 stainless steel.
• Special construction of Type 316 stainless steel is also available.

Series Options

The Vincent Press comes in various series, each with unique features:

• TSP Series: Features two overlapping screws for better dewatering performance.
• VP Series: Includes screens in the inlet hoppers and generally uses a belt drive between the motor and gearbox.
• CP Series: Compact design with a simplified cone drive and often uses profile bars screens.
• KP Series: Designed for a “soft” squeeze, using a lever actuated stopper plate instead of a discharge cone.

Test Facilities

Vincent Corporation maintains laboratory and pilot equipment for conducting various tests, including feed rates, moisture content, and horsepower requirements. Rental machines are also available for in-plant trials.