Abstract: A dryer section in a paper machine which comprises a number of dryer groups, each having drying cylinders, reversing cylinders arranged between adjacent pairs of drying cylinders and a wire which presses the web against heated cylinder faces of the drying cylinders whereas the web remains at the side of the outside curve on the reversing cylinders. The dryer groups are arranged in two or more stories. Some of the dryer groups in the dryer section are placed in the basement spaces underneath the machine hall level, and some of them are placed on the machine hall level.

Abstract: A lower wire loop of a paper machine has an initial single-wire portion of a dewatering zone defined by an initial portion of the wire of the lower wire loop, succeeded by an upper wire unit defining a twin-wire dewatering zone with a coinciding upper run of the wire of the lower wire loop. Dewatering occurs in the twin-water dewatering zone through the wire of the lower wire loop and the wire of the upper wire loop. The twin-wire dewatering zone is located above the level of the initial portion of the wire of the lower wire loop. A first dewatering element is a first forming shoe in the direction of the web run in the upper wire loop. The twin-wire zone curves in a first direction in a first sector on the first forming shoe so that dewatering occurs primarily through the wire of the lower wire loop. A second dewatering element is a second forming shoe following the first forming shoe and spaced therefrom in the lower wire loop.

Abstract: A process in the forming of a paper web, the dewatering of the pulp web, and of the paper web being formed comprises feeding the pulp suspension jet from the slice of the headbox into a gap formed by two wires, the gap becoming narrower in the feeding direction of the pump suspension jet. Water is removed from the pulp web when the web is in compression between the carrying wire and the covering wire within the twin-wire forming zone, which begins immediately after the feeding gap. The twin-wire forming zone is curved towards the loop of the carrying wire with a curve radius which is selected large enough so that the wire tensioning pressure resulting from it and acting upon the pulp web becomes low and the water removed from the pulp web is not splashed from the inside surface of the wire loop by the effect of centrifugal force dependent upon the curve radius.