摘要:
A method of application of a liquid or pasty medium onto a moving material web consisting, in particular, of paper or cardboard, in which a direct application (2) of a liquid or pasty medium (4) onto one side of a moving material web (1) and a contactless deflection (3) of the moving material web along a curved path of motion ensues, the side of the moving material web to be provided with the liquid or pasty medium passing through a concave curvature and the direct application (2) of the liquid or pasty medium ensuing directly ahead of the deflection (3) or during the deflection as a free jet along a contactlessly guided section of the moving material web. Additionally, an apparatus for implementing the method is described.
摘要:
This invention pertains to an elongated gap or extended nip press comprised of two pressing elements whose pressing areas are pressed against each other, wherein each of the press areas is formed of a band-shaped jacket element, with the jacket element moving around carriers and being supported by at least one support element, wherein a change of the length of the press gap or nip and/or of the pressure distribution or pattern in the press gap is accomplished in that the portions of the press elements that form the support surfaces and/or that the support elements of at least one of the pressing elements are displaceable in or against the direction of rotation of the respective jacket element.
摘要:
A twin wire former in a machine for the production of a fibrous material web, specifically a paper or cardboard web, includes two rotating continuous wires which meet in the area of a simultaneously rotating dewatering element, thereby forming a stock inlet gap; and a headbox over which the fiber stock suspension is fed into the stock inlet gap. The stock consistency C of the fiber stock suspension in the headbox, as well as the basis weight F of the fiber stock suspension supplied to the stock inlet gap is selected according to the calculation: F/(C*1000)>0.025 whereby the basis weight F is stated in g/m2 and the stock consistency C is stated in g/l.
摘要翻译:用于生产纤维材料网,特别是纸或纸板网的机器中的双线成形机包括在同时旋转的脱水元件的区域中相遇的两个旋转的连续线,从而形成原料入口间隙; 以及流浆箱,纤维原料悬浮液通过该流浆箱进料到料料入口间隙中。 根据计算,选择流浆箱中的纤维原料悬浮液的原料浓度C以及供给到原料入口间隙的纤维原料悬浮液的单位面积重量F,由此基重F以g / m 2表示, 库存一致性C以g / l表示。
摘要:
A process for producing a web (1) of paper, cardboard or other fibrous material using a device (28) for applying starch is characterised in that the dry content of the web (1) of fibrous material is of less than 70% while the starch becomes adhesive, and in that the web (1) of fibrous material is heated to a temperature which is sufficient for causing the starch to become adhesive.
摘要:
Headbox of a paper machine and a process of supplying a material suspension, The headbox includes at least one material suspension supplying system, and a headbox nozzle that includes a first dividing wall having a machine width and a second dividing wall having a machine width. The first and second dividing walls are arranged to form a first path in which a total nozzle cross-section steadily and continually decreases in a material flow direction and to form a second path, arranged to follow the first path, in which a total nozzle cross-section continually increases in the material flow direction. The process includes includes accelerating the material suspension along a first path having a total nozzle cross-section that steadily and continually decreases in a material flow direction, and decelerating the material suspension along a second path having a total nozzle cross-section that continually increases in the material flow direction. The second path is arranged to follow the first path.
摘要:
Dewatering device and process of a machine for at least one of production and processing of a material web, as well as a glazing device an process. The dewatering device includes a circulating flexible continuous belt and an opposite surface. The circulating flexible continuous belt and the opposite surface are arranged to form a nip elongated in a web travel direction, and at least one screen is adapted to guide the material web through the nip. A saddle, which is arranged to support the circulating flexible continuous belt, is segmented in the web travel direction into saddle segments connected to each other. The saddle segments are at least partially separately pressurized. The dewatering process includes guiding the material web through the nip, and at least partially separately pressurizing the saddle segments against the opposite surface. The glazing device includes a heated roller composed of a saddle roller and a mating roller, and the heated roller and the mating roller are arranged to form a nip elongated in a web travel direction. The saddle roller may include a flexible roller jacket supported by a saddle which is segmented in the web travel direction into saddle segments connected to each other. The saddle segments are at least partially separately pressurized. The glazing process includes guiding the material web through the nip, and at least partially separately pressurizing the saddle segments against the mating roller.
摘要:
A method and machine for the manufacturing a fibrous pulp web including a first draining zone and a second draining zone, where the first and second draining zones are successively arranged in the web run direction, where a first side of the web is drained in the first draining zone by pressure acting on the web which increases from an initial pressure to a final pressure, where a second side of the web is drained in the second draining zone by pressure acting on the web which increases from an initial pressure to a final pressure in the web run direction, and where the initial pressure in the second draining zone is less than the final pressure in the first draining zone.
摘要:
Twin-wire former for producing a fibrous web. The former includes two endless wire belts arranged to form a twin-wire zone, a dewatering element, and a headbox positioned at an angle relative to an imaginary first horizontal plane. The twin-wire zone includes a first section in which the two wire belts are arranged to run over the dewatering element. The two wire belts are further positioned to form a wedge-like inlet gap that is structured and arranged to receive a fibrous stock suspension directly from the headbox. Additional dewatering elements are utilized. The twin-wire zone includes a second section in which the two wire belts along with the fibrous web formed between the two wire belts are arranged to run downward over the additional dewatering elements. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
摘要:
Process for dewatering a fibrous web in a dewatering press including a counterpart face, a shoe press unit having a revolving flexible press belt and at least one press shoe such that the at least one press shoe is arranged to press the flexible press belt against the counterpart face, at least one nip formed by the flexible press belt being pressed against the counterpart face having a length extending in a web travel direction and being at least substantially similar to a length of the at least one press shoe in the web travel direction, and a device that guides the fibrous web and at least one dewatering belt being guided through the extended nip. The process may include pressing the fibrous web within the extended nip, determining a dwell time of the fibrous web within the extended nip, and maintaining the dwell time at less than approximately 12 ms. The dewatering press may include a counterpart face and a shoe press unit that includes a revolving flexible press belt and at least one press shoe. The at least one press shoe may be arranged to press the flexible press belt against the counterpart face. At least one nip may be formed by the flexible press belt being pressed against the counterpart face and may have a length extended in a web travel direction. The extended nip length in the web travel direction may be at least substantially similar to a length of the at least one press shoe in the web travel direction, and the fibrous web and at least one dewatering belt may be guided through the extended nip. The dewatering press may be arranged to provide a dwell time of the fibrous web being within the extended nip of less than approximately 12 ms.
摘要:
Device for guiding a paper sheet on a belt that includes first air guidance surfaces located on a paper sheet guiding side of the belt. The first air guidance surfaces may be positioned to create a dynamic pressure between the first air guidance surfaces and the paper sheet and to press the paper sheet into the belt.