Gruvön Gruvön, Sweden Home of the world’s strongest fluting, Billerud Flute® and a pioneer in several areas including the development of BillerudKorsnäs FibreForm®. Production capacity: 710 000 tonnes. Number of employees: 850 (approx). Products: Kraft paper, sack paper, corrugated solutions.(fluting, liner), liquid board, cup stock, market pulp.