one roll couple or to use more than two roll couples and the apparatus for supplying chips to the roll couple or couples may be of types other than the distributing device 12 described above the surfaces of the rolls used in the present invention differ from that of rolls used for delaminating chips previously in that the roll surfaces of the present invention are aggressively contoured in the embodiment shown in fig3 the roll surface comprises a matrix of pyramid shaped projections 100 which are formed by machining into the roll surface circumferential v shaped valleys 102 and axial v shaped valleys 104 in the roll at right angles by machining such intersecting valleys four sided pyramids are formed extending radially outward on the roll surface each of the projections 100 has a peak 106 formed by the remaining material from the outer portions of the machined roll surface and a base 108 defined by the depth of the intersecting valleys 102 and 104 in the machined material zone normally both rolls of the roll couples have similar surface configuration however it may be desirable to have one roll of each roll couple be smooth or otherwise have a more aggressively or less aggressively contoured surface than that of the other roll in the roll couple in one structure found to work advantageously the roll surface was formed wherein the peaks 106 were spaced one half inch apart and each peak comprised a flattened surface approximately one sixteenth inch square the depth of each pyramid from peak 106 to base 108 was six millimeters in the use and operation of an apparatus for destructuring wood chips as depicted in the aforedescribed drawings.