Voith Patent GmbH

A forming screen has a form of a continuous web extending in a longitudinal direction and has a first lateral edge and a second lateral edge opposite the first lateral edge. The forming screen has a perforated useful region arranged between the first and second lateral edges, on which the fibrous web is formed and which is spaced apart from the first and second lateral edges. The forming screen has a first edge strip arranged between the first lateral edge and the useful region and a second edge strip arranged between the second lateral edge and the useful region. The first and second edge strips are also perforated, and an unperforated first separating strip is arranged between the first edge strip and the useful region and/or an unperforated second separating strip is arranged between the second edge strip and the useful region.

A press cover for a press roll or a transport belt has at least one polyurethane-containing layer. The polyurethane is obtainable by reaction of i) a polyol component, ii) an isocyanate component, and iii) a component containing at least one crosslinker. The polyol component is composed of mutually different structural units having the general formula —O—R 1 —X—R 2 —O— in which all of R 1 and R 2 independently of one another are identical or different and are linear or branched C 1 -C 20 alkylene groups. Groups X are identical or different and are selected from bond, O, C(O)—O, and O—C(O)—O. At least 70 wt % of the structural units meet the following criteria: a) at least 80% of X are O—C(O)—O and the remainder are O or C(O)—O, and b) the average chain length of R 1 and R 2 is 8 or more carbon atoms, and c) at least 50% of R 1 and R 2 are independently of one another a linear or branched C 8 -C 12 alkylene group.

Sensor module has one or more sensor pairs with a first sensor and a second sensor, each having an electrode for a ground terminal and an electrode for a signal terminal. The sensor module has at least one ground line as well as a first signal line and a second signal line. The first signal line is connected to the signal terminal of the first sensor, the second signal line is connected to the signal terminal of the second sensor, and the ground line is connected to the ground terminals of the first and second sensors. The sensor module extends in a longitudinal direction L from a beginning to an end, and the ground line and the signal lines run from the beginning to the end of the sensor module without crossing each other.

A process for the production or treatment of a fibrous web, in particular a paper or cardboard web, includes the following steps: a. drying of the fibrous web in a dryer section; b. subsequent cooling of at least one first side of the fibrous web by way of convection cooling, whereby the fibrous web has a temperature of 65° C. or less on at least the first side after cooling, in particular 50° C. and less; c. apply steam to at least the first side of the fibrous web, in particular the temperature on the first side after steam application is at least 70° C., optionally more than 80° C. or 90° C.; and d. treatment of the fibrous web in at least one calendering nip.

A woven fabric for use in a machine to produce a fiber web, preferably a tissue web. The woven fabric has a machine direction and a transverse direction, as well as a paper side and a machine side. The paper side is formed of warp yarns and weft yarns, which are interwoven with one another in a weave pattern. The paper side has a plurality of twill lines, wherein each twill line is formed by a plurality of adjacent warp yarn floats. The twill lines are completely or substantially formed by warp yarns floating across seven successive weft yarns and adjacent warp yarn floats overlapping over a length of four weft yarns.

A woven fabric has warp threads and weft threads that are interwoven for configuring a textile structure. The woven fabric has a thickness direction as well as a warp direction and a weft direction. The warp threads and/or the weft threads in the thickness direction have a wave-shaped profile. At least some, preferably all, weft threads have a wave-shaped profile in the warp direction, and/or at least some, preferably all, warp threads have a wave-shaped profile in the weft direction. Moreover, a technical textile is formed from such a woven fabric.

An installation for producing a fibrous material web, in particular a long-fiber paper or wet nonwoven web, contains a binder wire section having a binder wire for applying an aqueous binder to the fibrous material web, and a dryer section having a dryer fabric for drying and consolidating the fibrous material web. The binder wire section and the dryer section are arranged at a distance from each other, so that the fibrous material web is led from the binder wire to the dryer fabric in a free draw. At least one air extraction device is arranged at the edge of the installation in the region of the distance between the binder wire section and the dryer section.

A fabric for a machine for producing a fiberweb, the fabric including a woven base structure including a first base element and a second base element, wherein the first base element includes a first flat woven base material and the second base element includes a second flat woven base material, wherein the first flat woven base material has a length of twice a length of the fabric and is folded in a middle, creating a first two-ply element and a first fold, wherein the second flat woven base material also has a length of twice the length of the fabric and is folded in a middle, creating a second two-ply element and a second fold, and wherein the first base element and the second base element is arranged so that at least one ply of the first two-ply element is positioned between plies of the second two-ply element.

A press arrangement and method for pressing a fibrous web include a main press with extended press nip having a length of at least 150 mm. The main press is configured such that, when operated with a line load LL of at least 1,200 kN/m, a line-load ratio LLR of at least 0.69 and at most 1.52 is obtained. The line-load ratio LLR is defined as the quotient of a weighted line load WLL to the line load LL, the weighted line load WLL being the result of integration of the squared local pressure p(x) 2 , weighted with a weighting factor A, over the nip length x, the weighting factor A being one divided by ten megapascal. The line load LL is the result of integration of the local pressure p(x) over the nip length x, such that the following formula for the line-load ratio LLR applies: LLR = WLL LL = ∫ A * p ⁡ ( x ) 2 ⁢ dx ∫ p ⁡ ( x ) ⁢ dx = ∫ 1 10 ⁢ MPa * p ⁡ ( x ) 2 ⁢ d ⁢ x ∫ p ⁡ ( x ) ⁢ d ⁢ x

A press arrangement for pressing a web of fibrous material includes at least two presses which are arranged one behind the other in a direction of travel of the web of fibrous material, the at least two presses including a first press and a second press following the first press, the first press including a first press nip, the second press including a second press nip which is an extended press nip, the second press being configured for being operated at a linear load of at least 500 kN/m, the second press being configured such that a quotient of an average pressure and a peak pressure in the second press nip is less than 0.5, the second press being configured for applying the peak pressure of at least 12 MPa onto the web of fibrous material.