Dec 29, 2006. /Lesprom Network/. Ahlstrom company, producer of high performance fiber-based materials, today announced significant price increases on its calender bowl materials, as a consequence of the continuous rise of raw materials, energy, transportation and packaging costs. The price increases will be effective as from January 1, 2007. The level of the increases will depend on existing contracts and invoicing currencies. The detailed actions are being discussed with customers.