TOKYO( Kyodo)--A number of Japanese firms have recently turned to paper as a more environmentally friendly alternative to plastic products, from water-resistant cardboard boxes to small hangers.... The newly manufactured cardboard is coated with a chemical that repels water and moisture, and when made into a box, it can hold water for up to three weeks, Nippon Paper Industries said.... Meanwhile, Oji F-Tex Co., a subsidiary of pulp and paper manufacturer Oji Holdings Corp., has developed trans