Leading yarn manufacturer Unifi Inc on Wednesday posted a far wider fourth quarter net loss as it was hurt by hefty charges linked to the restructuring of its US and European operations and the loss of an arbitration dispute with DuPont. The North Carolina-base company reported a net loss of $30.5 million, or 57 cents per share, for the quarter ending June 29, compared to a net loss of $1.6m, or three cents per share, in the year-ago period.