Andreas Kufferath Gmbh & Co. Kg

Andritz Technology and Asset Management Gmbh

Klaus Fichter

Wolfgang Heger

An upper side for a multiple-layer sheet-forming fabric has a multiplicity of longitudinal threads woven with a multiplicity of transverse threads and thereby form repeats in the longitudinal and transverse directions. The transverse-thread repeat contains three times as many threads as the longitudinal-thread repeat. The longitudinal-thread repeat has at least three threads. The transverse-thread repeat has at least nine threads. All longitudinal threads run alternately over three transverse threads and under three transverse threads, and subsequently under the remaining transverse threads of a transverse thread repeat. Two directly adjacent longitudinal threads are displaced with respect to one another in the longitudinal direction by at least three transverse threads.

Upper side, in particular paper side, and papermaking-machine fabric

A wire cloth, in particular a paper making wire cloth, has at least two fabric layers (B,T;B,T), including an upper fabric layer made of wires in the making direction () and wires in the cross direction (), and a lower fabric layer made of wires in the making direction and wires in the cross direction (). Wire bridges are formed for the individual fabric layers in such a way that they extend over a predeterminable distance within a pattern repeat without being tied to other wires. The wire bridges of the upper cross direction wires extend within a pattern repeat over at least nine making direction wires and under maximum one making direction wire. The wire bridges of the lower cross direction wires extend within the pattern repeat at least under six and over two making direction wires. Between two making direction wires extending over a cross direction wire, at least one other making direction wire extends under the same cross direction wire.

Wire cloth, in particular paper making wire cloth

A papermaking screen, especially for the sheet forming zone, has one paper side and one machine side with a first type of transverse yarns of the paper side and a second type of transverse yarns (to) of the machine side. The transverse yarns are woven with at least one type of longitudinal yarns (to). The longitudinal yarns (to) on the machine side within the machine-side pattern repeat bind two respective transverse yarns of the second type (). The division of the intersections for the longitudinal yarns is then improved, so that marks in the paper to be produced are prevented to the greatest extent possible.

Papermaking screen

A papermaking screen includes at least one individual fabric for the paper side and at least one individual fabric for the machine side. Each of those fabrics is provided with a set of weft yarns () and warp yarns (). At least one part of the superimposed individual fabrics is interconnected via binder yarns (). The two fabric layers (paper side and machine side) are connected by binder yarns that are fully integrated into the fabric structure of the paper side and are able to support the resulting binding point due to each binder yarn () engaging with warp yarns () of the individual fabric from above at defined points on the paper side, while at least one weft yarn () of the individual fabric engages with the warp yarns () from below on the opposite side so as to lean against it such that the binder yarns remain on one plane along with the weft and the remaining warp yarns. This arrangement results in a high-strength papermaking screen which has very good dewatering power and a regular structure.

A papermaking wire cloth, especially for the sheet forming zone, includes a paper side () and a backing side (). The wire cloth is formed out of at least one type of transverse threads () which are interwoven with at least one type of longitudinal threads (). The threads together form repeats (A-H) and at least two different types of crossing (). The longitudinal threads () are alternated within the respective repeat (A-H) on the backing side (), forming the other type of intersection (). The transverse threads () on the backing side () are held on their outer side () which faces the paper side (), by at least two longitudinal threads () within the repeat (A-H) on the backing side (). Maximum fibre support is achieved on the paper side accompanied by little marking of the upper side as the points of alternation or intersections are evenly distributed.

Paper making wire cloth

A paper-making machine wire cloth has an individual woven cloth for the paper side () and an individual woven cloth for the running side (). Each woven cloth includes a set of weft threads () and warp threads (). The diameters and the number of paper side and running side warp threads () are essentially equal. The paper side warp threads () and weft threads (), together, form a weave. At least a portion of the running side threads () passes into the paper side (), extends over the subsequent paper side weft thread () and, afterwards, returns to the running side () each time at a location (), at which this warp thread () is located above at least one assigned running side weft thread (). A marking-free paper side is achieved in the weave, while simultaneously improving the surface uniformity. A compact binding of the individual woven cloth is effected without the use of additional binding threads, largely avoiding a layer separation of the individual woven cloth or an offset of the same with regard to one another.

Growing community of inventors

Jüchen, Germany

Klaus Fichter