Method for reconfiguring finishing rolls in a plastic sheet fabrication sheetline

A method of reconfiguring at least three finishing rolls of a plastic sheet fabricating sheetline and forming extruded sheet, said method comprising the steps of:

• maintaining in a stationary position a center one of the finishing rolls being mounted for rotation about a first axis;
• angularly adjustably moving between angularly displaced positions, relative to the center roll, and about the first axis, a first outer one of the rolls being mounted for rotation about a second axis, said first outer roll being moved through an adjustment angle of at least 45.degree. to reconfigure substantially the angular position of the first outer roll relative to the center roll, the first roll forming a first nip with the center roll, and wherein the first nip is circumferentially displaced about the center roll as-the first outer roll is angularly moved;
• angularly adjustably moving between angularly displaced positions, relative to the center roll, and about the first axis, a second outer one of the rolls being mounted for rotation about a third axis, said second outer roll being moved through an adjustment angle of at least 45.degree. to reconfigure substantially the angular position of the second outer roll relative to the center roll, the second roll forming a second nip with the center roll, and wherein the second nip is circumferentially displaced about the center roll as the second outer roll is angularly moved;
• and
• extruding molten plastic material into one of said first and second nips to form a sheet of the plastic material, the sheet being wound around at least a portion of the surfaces of each of the three rolls, the amount of surface contact with the rolls varying in accordance with the circumferential positions of the nips.