Abstract: The object of the invention is an apparatus and a method for improving the detachment of paper (1) from the cylinder of a paper machine in a drying section implemented with a single wire transfer, which drying section comprises means for heating the paper on the drying cylinder (3) and for transporting it onwards on the wire (2) via a hitch roll (8) to the next drying cylinder such that the paper together with the wire in the section between the cylinders is sucked against the wire by means of low pressure. What is essential to the invention is that in order to improve the detachment of the paper (1) an apparatus is installed on the opposite side of the drying wire (2) at the detachment point (7), which apparatus comprises a nozzle (14), with which an air jet (11) is blown against the direction of travel (15) of the drying wire, and a carrying surface (9) such that the air jet (11) ejects secondary air (17) along with it causing an air flow (18) between the planar carrying surface (9) and the drying wire (2).
Abstract: The object of the invention is an apparatus and a method for improving the detachment of paper (1) from the cylinder of a paper machine in a drying section implemented with a single wire transfer, which drying section comprises means for heating the paper on the drying cylinder (3) and for transporting it onwards on the wire (2) via a hitch roll (8) to the next drying cylinder such that the paper together with the wire in the section between the cylinders is sucked against the wire by means of low pressure. What is essential to the invention is that in order to improve the detachment of the paper (1) an apparatus is installed on the opposite side of the drying wire (2) at the detachment point (7), which apparatus comprises a nozzle (14), with which an air jet (11) is blown against the direction of travel (15) of the drying wire, and a carrying surface (9) such that the air jet (11) ejects secondary air (17) along with it causing an air flow (18) between the planar carrying surface (9) and the drying wire (2).
Abstract: The invention relates to an apparatus for the on-line determination of paper web moisture content and/or temperature on the dryer section of a papermaking machine. The apparatus is designed to form, in combination with a doctor means and/or a packet ventilating tube, such a compact structure wherein the apparatus operates underneath such means or in a close proximity thereto. The invention also relates to a method for control of paper web moisture content and temperature on the basis of measurements performed on the dryer section of a papermaking machine.
Type:
Grant
Filed:
November 2, 2000
Date of Patent:
November 28, 2006
Assignee:
EV Group Oy
Inventors:
Pekka Koskinen, Esa Virtanen, Ilpo Pitkaniemi, Jari Ristola
Abstract: An apparatus for separating droplets and/or solid particles from a gas. The apparatus includes a shell defining a space. An impeller in the space and a gas inlet duct through the shell are arranged for introducing gas with liquid and/or solid particles into the space. A driving device rotates the impeller. One or several openings are arranged around the shell. At least a major portion of the liquid and/or solid particles exit through the openings and may be carried into a collecting space which may be outside the shell.
Abstract: A method and apparatus for cleaning a drying fabric of a paper machine. In the method a cleaning liquid is introduced into a gap (3) defined by the roll or cylinder (2) of a paper machine and a fabric (1) being fed onto the roll or cylinder. The cleaning liquid is pressed between the roll or cylinder (2) and the fabric (1) and is carried along with the fabric and is spread along the whole width of the fabric. The apparatus includes means for introducing and spreading the cleaning liquid into the gap between the roll and cylinder (2) and the drying fabric and, optionally, includes means (6) for collecting the cleaning liquid.
Abstract: A method for cleaning one or more orifice slots (2, 3) of a blow box (1) or similar object particularly in the press or dryer section of a paper machine or similar equipment. The orifice slot (2, 3) is subjected to treatment from inside the blow box by means of one or more mechanical cleaning elements (4) and/or a cleaning jet (8, 9, 23). The invention also concerns an apparatus suited for implementing said method.