Disclosed is a device for forming an extended nip between a counter roll and a shoe roll for machining a material web, wherein the shoe roll has a support and a flexible roll shell, which can rotate around the support (4) and which rests in the region of the extended nip upon a head surface of a press shoe guided on the support, and the press shoe displaceably rests on the support in order to generate a press pressure via a pressure chamber to which fluid can be applied, the pressure chamber is disposed as a pressure pad, on which the press shoe rests surficially on the rear side, wherein the pressure pad is inserted into a groove-like chamber, wherein the press shoe has a stamp-like section on the rear side, which stamp-like section descends into an invaginable pressure pad in order to perform reciprocating movements, and the pressure pad is guidedly supported on the groove-like chamber along a pressure pad lateral wall that forms a roll wall.

The invention relates to an extended nip roll 1 for use in a nip N through which a fibrous web W is to be passed. The roll has two axial ends 3, 4 and comprises a support beam 5 having an axial extension between the axial ends 3, 4 of the extended nip roll and a press body 6 with an axial extension and which press body 6 is substantially parallel with the support beam 5 as well as means 7 supported by the support beam 5 for causing the press body to move or expand radially outwards towards a counter roll 2 to form a nip N. The inventive roll also comprises a tubular flexible jacket 8 with two axial ends 12, 13, the tubular flexible jacket 8 forming a loop around the press body 6 and the support beam 5. At each end of the extended nip roll 1, there is an end wall 9, 10 which is rotatably journalled to allow each end wall 9, 10 to rotate about the support beam 5. Each end wall 9, 10 being attached to an axial end 12, 13 of the tubular flexible jacket 8 such that the end walls 9, 10 and the tubular flexible jacket 8 form together an enclosed space 14. On the support beam 5, there is at least one support element 15 for the tubular flexible jacket 8 which support element 15 is arranged to support a part of the tubular flexible jacket 8 at a location spaced away from the press body 6. According to the invention, the at least one support element 15 is arranged to be movable in a circumferential direction such that it can be moved to different positions along the circumference of the tubular flexible jacket 8.

The invention relates to a method to produce a linerboard exhibiting a high bending resistance and a high compression strength, which in turn provides high resistance to interflute buckling and sagging in a thereof formed corrugated board. This is achieved by the inventive combination of an optimized fiber refining level of the furnish in each layer of the linerboard, the separate formation of the top layer and the use of a multi-layer headbox to form the two-layered ply. In addition, the linerboard made according to the invention provides good printing properties in a thereof produced corrugated board, especially in flexographic printing, without the fluting structure being negatively affected.

An extended nip press apparatus (1) for removing water from a web (20), comprising a rotatable backing roll (2), an elongated press device (3, 30) cooperating with the backing roll for defining between the elongated press device (3, 30) and the backing roll (2) an extended nip (4). The elongated press device is provided with a perforated belt (5, 50). A moveable, permeable carrying medium (6a) is arranged to be passed through the extended nip, and to support on a surface thereof a web 20. A mechanical pressure is created between the backing roll (2) and the elongated press device in the extended nip, and a vacuum is applied to the extended nip through the elongated press device, thereby both a mechanical pressure and a vacuum is applied to a web (20) being passed through the extended nip (4) on the carrying medium (6a).

The present invention relates to a method for dewatering a web comprising microfibrillated cellulose, wherein the method comprises the steps of: providing a suspension comprising between 50 wt-% to 100 wt-% of microfibrillated cellulose based on total dry weight, forming a fibrous web of said suspension on a support wherein said web has a dry content of 1-25% by weight, applying a dewatering felt into direct contact with the fibrous web, conducting said fibrous web, arranged between said dewatering felt and said support, through at least one shoe press equipment, drying the dewatered web to form a film which film has an Oxygen Transmission Rate (OTR) value (23 C., 50% RH) below 100 cc/m.sup.2/24 h according to ASTM D-3985.

There is provided a method of producing a paper- or linerboard having a grammage measured according to ISO 536:2019 of 170-310 g/m2 and comprising a print layer, a middle layer and a back layer, wherein the middle layer is formed from a middle layer furnish comprising at least 25% by dry weight CTMP and the back layer is formed from a back layer furnish comprising an unbleached pulp, such as an unbleached kraft pulp, said method comprising the step of subjecting a multi-layered web at a speed of at least 600 m/min to pressing in a press section comprising a first and a second double-felted shoe press nip arranged in series, wherein the total press impulse of the double-felted shoe press nips is at least 95 kPa*s, preferably at least 100 kPa*s.

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.

The present invention relates to a support body (50) for a paper machine having an extended nip formed between the support body and a counter-pressure member, wherein the support body comprisesa base body (51) comprising an upper surface facing in the first direction, a cover body (52) comprising a working surface (15) for forming an extended nip with a counter-pressure member, wherein the cover body (52) is mounted on the upper surface of the base body (51) such that the working surface faces in the first direction, and wherein the cover body (52) comprises a first material, said first material being a polymer. The invention also relates to a paper machine comprising a support body (50).