In addition, strikes and an explosion have stopped the group's production plants.      At Metsä Group's Äänekoski bioproduct factory, the annual maintenance shutdown begins at the end of the week. The factory will be shut down on Friday morning (April 5) by department, it will be restarted at the end of the month. During the maintenance shutdown, necessary maintenance, cleaning and maintenance work is carried out at the factory. The most important works are the inspection and maintenance of the soda boiler and the kettle. At the moment, Mets ...