An apparatus and method for the production of an oriented plastic strap having a predetermined desired thickness for use in connection with a strap, such as ping package is described. The nip in the sheet workpiece formed between the pair of milling and stretching roller is guided, one of the rollers is rotated at a high linear surface speed than the linear surface speed of the other roller, the roller is rotated in both directions. One of the rollers is the other of the rollers on the other hand to destroy or process one of the surfaces of the sheet workpiece effectively, and the workpiece is accelerating the other of the surfaces of the sheet workpiece as it passes through the nip formed between the roller effectively , whereby the workpiece is milled by being stretched at the same time. This additional heating is provided in relation to the surface of the sheet workpiece that is exposed to the atmosphere prior to introducing the workpiece into the nip formed between a pair of rollers, the both surfaces have similar temperature level to indicate a similar density characteristics, and the sheet workpiece of the edge portion is heated also across its width so as to better control the flatness of the sheet material or workpiece. Flat amount of the sheet workpiece is zero - is accomplished by a specially formed milling extrusion die by a roller or a specially formed to form a gap assembly nip, whereby the edge part during their operation the milling and stretching the workpiece thickened portion edge of the sheet-workpiece If the comparison with the central portion of the sheet workpiece to exhibit a thickness equal to the thickness dimension of the central portion of the edge portion is thinner sheet workpiece.