Why Hammermill - Hammermill Papers- hammer mill defects and remedy ,When you buy Hammermill paper, you are supporting a brand that helps the kids at St. Jude Children's Research Hospital®. Each year, we donate $250,000 to help them advance cures and treatment of childhood cancer and other life-threatening diseases.Hammermill Screens - ThomasNetManufacturer & distributor of perforated metal screens including rotary screens & hammer mill screens. Industries served include aggregate & mining, food, chemical, wholesale hardware, window fabricators, waste water treatment, aerospace & petroleum.