David Hohman has been appointed vice president and general manager of Rycoline, a manufacturer of printing supplies based in Chicago, according to Dr. David Hill, Sun Chemical senior vice president, technology and operations.      Rycoline was recently acquired by Sun Chemical as part of its efforts to build a “total solution” package of products and services for printers. Rycoline produces and sells a range of well-known products under the Rycoline, Sun Graphic, Rogersol and Vivitek brands. ...