Aktiebolaget Karlstads Mekaniska Werkstad

Ab Karlstads Mekaniska Werkstad

Douglas Wahren

Erik G Stenberg

Carl Zotterman

Berndt Erik Klerelid

Erik Gunnar Stenberg

A headbox for paper and pulp machines is pivotally mounted at the ends of a plurality of control links secured to the machine frame and pointing from the machine frame towards a center of rotation in the vicinity of the headbox slice opening. The angular relation and the vertical position of the headbox with respect to a web forming zone are accurately set by controlling the rotation and translation of the respective control links and the headbox thereafter is maintained rigidly fixed in the set position.

Suspension device for a headbox for paper and pulp machines

Methods and apparatus for producing a web by injecting a jet of stock between two tensioned wires and running the wires over a circumferentially grooved forming cylinder. The cylinder grooves and a zone immediately on the other side of the wires extending from the forming throat where the web is injected to the web run-off point are in direct, open communication with the ambient atmosphere so that water is drained inwardly and outwardly of the forming cylinder as the web is being formed. The jet stock size, wire speed and wire tension are adjusted in relation to the radius of the forming cylinder so that the inward and outward drainage of liquid from the web occurs in relative amounts sufficient to avoid substantial two-sidedness of the web thus produced.

Two-sided drainage in a roll-type twin-wire former

A method and apparatus for continuously forming a fibrous web in which a fibrous suspension is injected into a tapered throat formed by two running wires pervious to the suspension and converging to the periphery of an impermeable roll; the wires and the injected suspension therebetween are transported over a portion of the periphery of the roll under tension to form and dewater the injected suspension; as the wires run off the forming and dewatering roll, the web is sucked loose from the outer wire and it and the wires are transported over a convexly curved surface under tension; and the web is separated from the outer wire by off-running in the direction away from the convexly curved surface while the inner wire runs off that surface with the web, the convexly curved surface being impermeable at least at the wire separation location.

Method and apparatus for forming a fibrous web

The transfer of a fibrous web in a paper-making machine from a first foraminous belt to a second foraminous belt is facilitated by applying water to the side of the first belt opposite from the side on which the web is carried partially to wet the web, leading the second belt into engagement with the fibrous web before or after wetting it, and after the web is wet, and while the second belt is in engagement with the web, causing the water or gas pressure on the side of the web adhering to the first belt to exceed the water or gas pressure on the side of the web adjacent to the second belt.

Method and apparatus for separating a fibrous web from a foraminous belt

Finely-mixed stock is produced in a headbox by delivering a multiplicity of separate stock streams at a relatively high velocity into passages defined between closely-spaced planar lamellae which extend parallel to the stock flow and oblique to a medial plane that lies axially and transversely of the fine-mixing stage that contains the lamellae. The stock flows at relatively low velocity in finely-mixed condition from the fine-mixing stage to a discharge nozzle, the axis of which lies at a substantial angle to the axis of the fine-mixing stage. The stock distribution and mixing section and the delivery nozzle of the headbox may be divided axially and transversely into two or more separate compartments for discharge of a jet composed of layers of the same or different stocks to form multi-ply webs. Different fiber orientations in different layers of such a multi-ply web are obtained by orienting the lamellae in the different chambers at substantially different oblique angles to the aforementioned axial-transverse medial plane of the fine-mixing stage.

Growing community of inventors

Karlstad, Sweden

Douglas Wahren