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SWECO separators were vibratory screening devices with from one to four decks (layers) of screens of varying mesh. The material to be screened was fed to the top layer. As vibration forced the material to the edge of the screen, the smaller particles or liquids passed through the mesh and the larger particles were funneled off from the periphery. Further passes through lower, finer screens removed increasingly smaller particles.

A vibratory separation machine consisted of a large metal cylinder, with layers of screen cloth inside, and spouts for inflow and outflow of materials. Units ranged up to 6 feet in diameter and were built with a variety of special configurations and custom features. In addition to selling separators, SWECO sold replacement screens and spare parts. These items were a continuing and profitable source of follow-on business. In 1972 SWECO separators ranged in price from $1,000 to $10,000; replacement screens sold for between $50 and $400 apiece.

The second product line in the Process Equipment Division was the Vibro-Energy grinding mill, used to reduce the size of wet or dry particles. A grinding mill was loaded with the material to be ground, together with a special grinding media (e.g., cyclindrical aluminum pellets). The combination was vibrated at a high frequency, producing a grinding action. Applications for the grinding mill included the processing of ceramics, pharmaceuticals, cosmetics, paints, foods, electronic memory cores, powdered metals, and pesticides.

Finishing Equipment Division. This division manufactured Vibro-Energy finishing mills, which deburred or polished metal parts by vibrating them with an abrasive compound. Customers for this equipment were diverse metalworking industries.

Environmental Systems Division. This division manufactured a centrifugal wastewater concentrator that used a fine-mesh centrifugal screening process to purify liquids. The concentrator was used in municipal applications for removing a high percentage of solids from raw sewage. It was also used in industrial processing plants, such as in paper, textiles, meatpacking, food canning, and poultry, where the concentrator could recover large amounts of usable material while cleaning up plant effluent.

Product Technology

The three-dimensional Meinzer process used in SWECO's products gave them several advantages over conventional vibratory products. The additional dimension of movement increased the number of ways in which the materials undergoing separation could be shaken and increased the force that could be exerted. This greatly improved the control of the separation process, its capacity to discriminate among different particles, and the rate of throughput. Second, the three-dimensional vibrating movement allowed the use of round rather than rectangular screens. This led to two advantages. A round screen made it possible to use an entire screening surface without having to worry about material becoming trapped in corners. Also, the screens could be mounted much more efficiently. A key feature of an efficient screen was that it be taut and even to prevent materials from concentrating at uneven spots. With rectangular screens, the mounting points on the framing rim exerted uneven pressures on the screen cloth. The mounting points for a round screen, in contrast, exerted exactly even pressures. The greater resulting tautness and freedom from irregularities increased both the screening efficiency and the life of a round screen.

For the exclusive use of S. Sayeste, 2018.

This document is authorized for use only by Sibiya Sayeste in Strategic Managment taught by Fairweather, Peter, SUNY - New Paltz from January 2018 to May 2018.