By Angie DeRosa, UT Akron BureauWilloughby, Ohio-Custom profile and tubing extruder Malish Plastics of Willoughby will add an extrusion line this September and plans to upgrade existing equipment next year.The company currently has eight extrusion lines in its 2800-sq.m site. Malish extrudes materials including thermoplastic polyurethane, PVC, ABS, high density polyethylene and polypropylene, and makes tooling, said national sales manager Dave Hutson."We are looking at improving technology in the extrusion of tightly toleranced, large-diameter, heavy-wall tubes," he said in a 23 Aug telephone interview.Malish Plastics was formed in 1987. About 25 percent of its total output is earmarked for its parent company, Willoughby-based Malish Corp., which makes rotary brushes and engineered pad-driver systems for floor-cleaning equipment.In addition to its Willoughby location, Malish Corp. has a production facility in Dongguan, China, where it makes brushes. The firm employs 150 and has been family-owned since its formation in 1948 as Malish Brush and Specialty Co."