Valmet Paper Machinery Inc.

Ev Group Oy

Valmet Oy

Kymmene Oy

Timo Haverinen

Pekka Eskelinen

Raimo Virta

Vesa Vuorinen

Pekka Koskinen

Juhani Jokinen

Martti Salmivaara

Ilpo Pitkäniemi

Raimo Malkki

Paavo Jaatinen

Pekka Koshinen

Jouko Tyrmi

The object of the invention is an apparatus and a method for improving the detachment of paper () 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 () and for transporting it onwards on the wire () via a hitch roll () 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 () an apparatus is installed on the opposite side of the drying wire () at the detachment point (), which apparatus comprises a nozzle (), with which an air jet () is blown against the direction of travel () of the drying wire, and a carrying surface () such that the air jet () ejects secondary air () along with it causing an air flow () between the planar carrying surface () and the drying wire ().

Apparatus and method for improving the detachment of paper from the drying cylinder of a paper machine

Method for cleaning fabrics of a paper machine

Method and device for ensuring the run of the web in the multi-cylinder

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.

Method and apparatus for use in the press or dryer section of a paper

The present invention is a method and apparatus for eliminating the flutter of a paper web in the dryer section of a papermaking machine between two single felt configurations in which the web is transferred from a dryer fabric of a first configuration onto a dryer fabric of a second configuration along a common run of the fabrics, the transfer being effected from one fabric to the other by means of a vacuum transfer roll, with the second configuration dryer fabric being brought into contact with the web and around which the fabric is winding, whereby on the side of the first configuration dryer fabric upstream of a contact point between the web carried thereon and the second configuration dryer fabric winding around the vacuum transfer roll there is provided a vacuum zone defined by the first configuration dryer fabric for retaining the web in contact with the first configuration dryer fabric. At a location downstream of the contact point in the traveling direction of the first configuration dryer fabric, air is blown from the side of the first configuration dryer fabric released from the web through the fabric into a gap formed between the second configuration dryer fabric lying on the vacuum transfer roll together with the web and the first configuration dryer fabric released from the web.

Method and apparatus for eliminating the flutter of a paper web in the

An apparatus in the dryer section of a papermaking machine for preventing the flutter of a paper web comprises an air blow box located between adjacent cylinders within a loop of a support fabric (F) formed by a guide roll. The blow box includes a blow chamber, into whose wall opens a nozzle for providing an ejector assembly together with an opposite wall included in the box. The walls build therebetween a flow path direct towards an uncovered section of support fabric (F). An air current discharging from nozzle is delivered through the flow path and into a space confined by the uncovered section of support fabric (F) and thereby through the support fabric. The air current creates a vacuum in a space defined between the ejector assembly and a section of support fabric (F) carrying the web (W).

Apparatus for eliminating the flutter of a paper web in the dryer

A method of and arrangement for resisting formation of undulations in a fiber/water mixture supplied onto a forming wire at an open planar wire section of a paper-making machine include establishing over the wire an air curtain extending over the full breadth thereof, in the region of which the air mass upon the wire is set in motion. The direction of movement of the air mass is the same as the traveling direction of the wire, and the velocity of the air substantially equals the speed of the wire. The air curtain commences on the planar wire section, in the machine direction, only at a given distance from a lip slice of a headbox of the machine, and the air curtain extends along the traveling direction of the web over the planar wire section over a given distance.

Method for resisting formation of undulations in a fiber/water mixture

Growing community of inventors

Masku, Finland

Timo Haverinen