Pressure Filtration

Testori solutions for pressure filtration address a wide range of industrial sectors, each with specific requirements in terms of filter medium performance, filtrate quality and resistance to process conditions.

Main sectors:

• Mining and refining (copper, iron, zinc, lead, nickel, precious metal and alumina concentrates)
• Drinking water and wastewater treatment (municipal and industrial plants)
• Quarries and excavation sites
• Food & beverage (vegetable and animal oils, sugar, wine, beer, juices)
• Chemical (special powders and hazardous substances)

Testori filter media ensure effective solid-liquid separation, high dewatering capacity and mechanical stability, thereby contributing to improved filtrate quality and overall efficiency of the production process.

Every solution is designed to integrate seamlessly into the equipment in use, reducing machine downtime and operating costs.

Testori filter fabrics for pressure filtration are made with a wide range of polymers: polypropylene, polyester, PBT, polyamide, PTFE and PEEK, combined with different yarn types (monofilament to optimize cake discharge, multi-filament for mechanical strength, staple fiber for maximum particle retention). Several weaves are available: plain, twill, satin and double layer, selected according to the specific process requirements such as separation efficiency, flexibility, cake discharge or mechanical strength.

Every fabric undergoes calendering to reach the required air permeability level (range from 1 to over 5,000 L/dm²/min) and heat setting to ensure dimensional stability at process temperatures.

Pressure filtration stands out for its capacity to ensure high dewatering performance, obtaining cakes with low residual moisture content compared to other solid-liquid separation technologies, reducing the volumes to be disposed of and optimizing the recovery of useful product.

Main operational advantages:

• Effectiveness in reaching high dry solids content with suspensions characterized by a fine particle size distribution
• Versatility of configuration, with equipment adaptable to contexts requiring large filtration surfaces in confined spaces

The Testori range for pressure filtration includes textile filter media developed for the different equipment found in industrial plants, each designed according to specific operating modes.

Horizontal filter presses

Cloths for horizontal filter presses represent the core product of the Testori offer for solid-liquid separation. The range includes a wide portfolio of configurations: single, overhang (or drape-over), twin with barrel neck, leak-free gasketed; and adapts to plates of varying dimensions, from laboratory scale up to over 2.5 meters in width.

Belt presses

Continuous belts for belt presses are widely used in municipal and industrial wastewater treatment plants, where dewatering involves sludge with a high content of adhesive colloidal solids. For these applications, high-drainage mono/mono fabrics are suitable, able to handle suspensions that are difficult to drain while maintaining high dewatering efficiency.

Vertical tower presses

Belts for vertical tower presses are dedicated to the filtration of high-value mineral concentrates and special powders from the chemical industry, applications requiring maximum solids recovery and minimum residual moisture content. The configuration of vertical tower presses also facilitates cake drying with compressed air.

Pressure vessels

Bags for pressure vessels are designed for processes involving the treatment of hazardous substances, maximizing the ratio between filtration surface and machine footprint. Filtration takes place from the outside to the inside of the bag, ensuring uniform cake formation and maximum retention of solid impurities.