Rock Products

JUL 2019

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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38 • ROCKproducts • July 2019 EQUIPMENT & TECHNOLOGY SCREENING & SIZING Screening equipment is a major capital investment across a myriad of industrial processing applications including: lime- stone, aggregates, minerals, coal, slag, sand, gravel and clay, among others. To maximize sustainable processes and productivity of this equipment, manufacturers must pay particular attention to an often overlooked, ongoing issue to accomplish their screening goals: replacement screen panels. Like toothbrush heads, screen panels wear out and must be replaced at opti- mal intervals to avoid machine downtime and lost revenues in screen tph and more. Replacement requirements vary based on specific applica- tions and the weight of the material applied to the screen, as well as material compositions that cause excessive blinding or plugging. For example, fine grain materials like sand require less screen replacement, whereas heavy, abrasive materials may require screen replacements as often as a few times per week. The fact is most manufacturers do not plan adequately for screen failure back-stock inventory. Therefore, it is impera- tive to implement a progressive logistical schedule of buying screens based on quick-turnaround shipping, delivery, and most importantly, screen quality based on specific applica- tion requirements. In-House Screening Solution Midwestern Industries Inc. started weaving screen wire in the early 1970s and continues to offer customers the unique ability to create made-to-order screens for their applications. Midwestern manufactures its own replacement wire crimping dies in-house, insuring the quality, durability and longevity of their screen panels. With virtually all screening products in one place, a vast array of custom sizing is available – weaving from small- to-large openings. Customized wire crimping dies are also manufactured on-site (based on need), as Midwestern crimps the wire in-house for each application. Round coil wire is crimped by wheel for every opening, which keeps quality standards high, and test runs are conducted and die adjustments are made to maximize the weave and die–making certain the opening stays true to quality stan- dards of the opening size. Replacement and particle sizing screens are manufactured to not only fit Midwestern's equipment, but most of the indus- try's other makes and models. Screening Dimensions and Materials With a focus on slotted screens, Midwestern's looms weave custom slots, widths, and lengths that cater to each unique application–delivering more throughput and a cleaner cut. The openings of square and slotted custom woven screen panels range from .032- to 5-in. square opening. Three types of wire are available including: stainless steel (304, 316 and 430 magnetic), high carbon and oil tempered. Midwestern also maintains a large inventory of fine mesh screens available in market grade, mill grade and tensile bolting cloth at both their Massillon, Ohio, headquarters and Macon, Ga., facility. Screening Product Profile The focus on slotted opening screens provides a maximum open area that tends to prevent blinding or plugging of mate- rial, as damp or sticky material does not build up on the longer openings. The smaller dimension controls the sizing of the material. Ultimately, Midwestern's experience is the determining factor for combining wire diameter, size of opening and type of slot. The particular application and length of slot may determine the number of shoot wires. Quality built and engineered at Midwestern's manufac- turing headquarters (147,000 sq. ft.) and southern facility (42,000 sq. ft.), a large variety of standard and custom woven heavy mesh, fine mesh and cloth edged screens are available including: • Slotted screens: Offer greater throughput by increasing the amount of open area. Available with single shoot or triple shoot construction. • Perforated plate: Made with an in-house laser bed for custom applications requiring bigger openings like heavy material – it features coarse aggregated upper end 2- to 6 in. openings. Midwestern Industries Expands Screening Capabilities

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