A needle-incisor was manufactured for trial. This machine has an incising mechanism that a set of needles held by a rotary plate incises timber which is moved toward the front simultaneously, and then another set of needles incises a new part of the timber. Timber is incised by recycling the process. Timber incised of 4400 incisons/m² with the depth of 56 mm by 2.8 mm-diameter needles on all the surfaces had 5-9 kg/m³ retention and 9.9-19.2 mm penetration of DDAC or CCA by pressure treatments. These values are agreed with those of the revised Japanese Agricultural Standard for lumber (1995).

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