Polyester giant Teijin Ltd on Thursday warned it expects to slip into the red during the first half due to restructuring costs related to the axing of loss-making operations. The firm said it now sees a group net loss of one billion yen for the six months to September 30 versus its prior outlook of break-even, with group sales seen down slightly at 446 billion yen but group operating profit outlook lifted to 15 billion yen from 10.5 billion yen.