Beam distortion control system using fluid channels

摘要

Paper and continuous web scanners operate at varying and high temperature conditions that cause distortion of the support beams and ultimately misalignment of the scanner heads. Circulating a heat transfer fluid between the support beams and through segmented fluid channels within the beam allows tuning of the beam's deflection when operating in an uneven thermal environment. The heat transfer rate can be modulated through various techniques, including: (1) varying the flow rate through each channel under manual or automatic control, (2) controlling the inlet fluid temperature of each channel with fluid immersion heaters or coolers, and (3) setting up the flow sequence via distribution channels that are, for example, in parallel, serial, or mixed.

主权项

1. A system for measuring properties of the composition of traveling webs of sheet material that are moving in a machine direction during manufacture, which comprises:
a first track mounted to extend in a cross direction, which is perpendicular to the machine direction, and adjacent to a face of a traveling web wherein the first track comprises a first elongated monolithic member with a first upper wall, a first lower wall and first and second side walls and a plurality of first segmented fluid channels that are integrated into two or more walls of the first monolithic member which has a rectangular cross section and hollow cavity; a first sensor device that is mounted on the first track and that moves along the cross direction; a second track mounted to extend generally parallel to the first track and adjacent a second face of the traveling web that is opposite the first face of the traveling web wherein the second track comprises a second elongated monolithic member with a second upper wall, a second lower wall and third and fourth side walls and a plurality of second segmented fluid channels that are integrated into two or more walls of the second monolithic member which has a rectangular cross section and hollow cavity; a second sensor device that is mounted on the second track and that moves along the cross direction, wherein the first and second sensor devices are aligned as they move back and forth along the cross direction; and means for delivering a modulated fluid heat transfer medium through the plurality of first and second segmented fluid channels in response to environmental temperature gradients to which the first and second track are exposed such that the fluid heat transfer medium is in direct thermal communication with the first and second monolithic members.