Straighter timber in southern Sweden A method, developed by SP Trätek, to measure and detect grain angle in an industrial environment has been tested in three sawmills in southern Sweden. By measuring the grain angle on logs or blocks it is possible to treat twist prone boards during kiln drying, and thereby to a large extent avoid producing twisted boards. The amount of sixths can be reduced by 4-5%. Besides the rise in quality of the produced timber, the disturbances in production are also lessened, due to fewer boards causing problems in the different process steps.