Water jet cutter

#1. Field of the Invention.

#The present invention relates to a water jet cutter for separation of a trim strip from a moving paper, cardboard, tissue or other type of fiber web, in a machine for the production and/or conversion of the fiber web, including at least one nozzle whose water jet is directed onto the fiber web.

#2. Description of the Related Art.

#The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

#FIG. 1 is a schematic side view of an embodiment of an operational water jet cutter of the present invention; and

#FIG. 2 is a top view of an embodiment of a support plate of the present invention.

#Referring now to the drawings, and more particularly to FIG. 1, there is shown a dryer section or group 20 of a paper machine wherein fiber web 1 runs usually alternates over heated dryer cylinders 4 and suction equipped guide rollers 11 for the purpose of being dried. Fiber web 1 is carried by at least one dryer fabric 8 of the respective dryer group, whereby fiber web 1 comes into contact with dryer cylinders 4.

#During drying the moisture content of fiber web 1 decreases and the consistency increases. In order to produce clean edges on fiber web 1, the water jet cutter is utilized. Because of the increased consistency of fiber web 1 this can occur in the unsupported section 22 of fiber web 1.

#This is relatively easy at the end of one dryer group, and specifically as shown in FIG. 1, at the end of the last dryer group. After leading off the corresponding dryer fabric 8, fiber web 1 travels into the area of water jet cutter 24. This is located between dryer cylinder 4 and a subsequent guide roller 5. Water jet cutter 24 includes essentially a nozzle 2 that is located above fiber web 1 and that directs the water jet approximately vertically onto fiber web 1. Support plate 3 is located on the opposite side for the purpose of supporting fiber web 1. Support plate 3 is equipped with a flat and smooth surface and, in uncompromised condition, is located at a distance 26 of between approximately 0-2 mm, and preferably 0.5 mm from fiber web 1. During cutting however, fiber web 1 is pressed against support plate 3. In order to avoid splash-back support plate 3 is equipped with cut-out 12 to accommodate the water jet according to FIG. 2. In addition, support plate 3 includes guide component 10 that assists the further transportation of the separated trim into pulper 6 of the dryer section. Guide component 10 can be adjustable relative to its location.