Interest in the mechanical finishing of knit apparel fabrics has increased since the 1990s. Polishing long pile knit fabrics with a pol-rotor machine involves laying the pile fibers in a single direction and shearing the pile to a uniform surface effect. Lafer SpA's Ultrasoft brush sueding machine incorporates a Delta continuous spreading system to create a minimal pile and a superior sueding effect. The machine features a sophisticated fabric tension control system and six synthetic sueding brushes set in a ring capable of rotating individually or as a moving drum. Lafer's Aquasand multiaction wet sueding machine, for woven, knit, and stretch fabrics, uses 20 sueding rolls that beat against the fabric in the manner of a card wire raising machine. Parks & Woolson Machine Company's Phoenix Polybrush sueding machine for knit or woven fabrics features six brushes with nylon fiber bristles containing embedded silicon carbon particles. Sucker-Muller-Hacoba GmbH's Poliactor PP-1 polishing machine is suitable for knit, woven, tufted, and raschel fabrics; blankets; imitation furs; linings; velours; and carpets. Other manufacturers of new polishing machines include Lamperti and Maria Crosta SRL.