A system and method is provided for proactive process intervention in manufacturing creped products via a chemical feed stage and a Yankee dryer stage. The method includes generating signals from a plurality of online sensors, corresponding to directly measured variables for respective process components such as, e.g., pH, conductivity, and Yankee blade vibration. Models are developed including retrievable information relating combinations of certain directly measured variables to respective quality characteristics of the creped product. The method further includes indirectly determining quality characteristics (e.g., softness, bulk) for the creped product, substantially in real time, based on, e.g., signals corresponding to directly measured variables, and optionally a predicted natural coating potential. An output feedback signal is automatically generated corresponding to a detected intervention event based on the indirectly determined one or more quality characteristics and respective predetermined targets. The feedback signal may automatically regulate chemistry feed characteristics, substantially in real time.

A high performance through-air apparatus is provided. The though-air apparatus includes a through-air roll configured for rotational movement about a first axis, and a high flow circuitous air path inside of the apparatus that includes a path extending through a supply conduit, through the through-air roll, and also through an exhaust conduit. The through-air apparatus also includes a plurality of turning vanes positioned within the high flow circuitous path positioned to guide the flow of air through the apparatus. The through-air apparatus has a length, a width, a height, which together define a volume having a compact configuration. The high flow circuitous air path inside of the apparatus has a length, where the ratio of the volume of the through-air apparatus to the length of the high flow circuitous air path is less than 20 m.sup.2.

The invention relates to a method and a device for drying a pulp web, with dewatering of the pulp web by pressing and the pulp web being guided directly on the press belt to a first transfer area for transfer of the pulp web to a transfer clothing and transfer of the pulp web in a second transfer area to a dryer. It is characterized in that the pulp web undergoes thermal drying between the first transfer area and the second transfer area. This enables production of a pulp web with improved quality characteristics and low energy consumption at the same time.

The invention relates to a method and a device for drying a pulp web, with dewatering of the pulp web by pressing and the pulp web being guided directly on the press belt to a first transfer area for transfer of the pulp web to a transfer clothing and transfer of the pulp web in a second transfer area to a dryer. It is characterized in that the pulp web undergoes thermal drying between the first transfer area and the second transfer area. This enables production of a pulp web with improved quality characteristics and low energy consumption at the same time.

The present invention relates to a crescent former for producing tissue paper, the former comprising a forming section (A), a press section (B) and a drying section (C), wherein the crescent former further comprises a felt fabric (41) for carrying the stock from the forming nip (15) of the forming section (A) to the press nip (22) of the press section (B), and the felt fabric (41) being configured to carry the stock to the press nip (22) where the stock is transferred to the drying section (C), wherein further the felt fabric (41) is configured to be returned from the press nip (22) to the forming nip (15) in a return section (D) such that the felt fabric (41) forms an endless loop, wherein the return section (D) comprises a cleaning station (42), of which at least a part is arranged in a negative machine direction (-MD) in relation to a center line (R) of the forming roll (12).

The invention relates to a tissue paper making machine designed for possible rebuild from one concept to another. The machine comprises a forming section (2) and a Yankee drying cylinder (3) mounted to be rotatable about a first axis of rotation (A1). The forming section has a forming roll mounted for rotation about a second axis of rotation (A2) which is parallel to the first axis of rotation (A1). The forming section (2) has a head box (5) and a first and a second forming fabric (6,7). The head box (5) is arranged to inject stock into a gap (8) between the first forming fabric (6) and the second forming fabric (7). The first forming fabric (6) is a felt that forms a loop and is arranged to carry a newly formed fibrous web (W) from the forming section (2) to the Yankee drying cylinder (3). The tissue paper making machine (1) comprises a press roll (9) arranged inside the loop of the first forming fabric (6) and forming a nip (N) against the Yankee drying cylinder (3). The distance (X) in the horizontal direction between the first axis of rotation (A1) and the second axis of rotation (A2) is in the range of 18 m-40 m.

A through-air apparatus for drying or bonding paper, tissue, or nonwoven webs is provided. The apparatus includes a web-carrying structure configured to move and a first component having at least one sealing element adjacent the web-carrying structure, where the sealing element is configured to reduce the infiltration of ambient air into the through-air apparatus. The apparatus also includes at least one channel configured to direct air to the sealing element to reduce the infiltration of ambient air into the through-air apparatus. A method of operating a through-air apparatus for drying or bonding paper, tissue, or nonwoven webs is also provided. The method includes directing air to a sealing element to reduce the infiltration of ambient air into the through-air apparatus.

A two-ply rolled Through Air Dried paper towel with high total absorption and absorption rate at a low basis weight. Further, the paper towel has a unique combination of properties including an Sdr value of greater than 30, and a Vvd value of greater than 4.

Herein described is a plant for the production of a web-like paper material which comprises a system for generating steam at three or more pressure levels using the discharge coming from a Yankee hood. This system allows an energy recovery, given that the steam produced is generated through two heat exchangers, supplied by the Yankee hood discharge which would otherwise be disposed into the atmosphere. The first heat exchanger conveys the exit of the mixed phase in a first pressurised tank, where the steam is separated from water. From here the steam is introduced into the line for use in the paper drying process, while the water at balance temperature with the steam is transferred in a second pressurised tank, with lower pressure with respect to that of the first tank. Lastly, the residual water is introduced into a third pressurised tank, with lower pressure with respect to that of is the second tank, which collects the condensate from the Yankee cylinder together with the blow-through steam, so that this blow-through steam is recompressed to the operating pressure of the plant and it is re-introduced in the plant.

A sheet manufacturing apparatus including an accumulating unit that causes a defibrated product to accumulate in a dry manner and forms a web, a moisture adding unit that adds moisture from a side of one surface of the formed web such that a moisture content of the web is equal to or more than 12 mass % and equal to or less than 40 mass %, and a heating unit that heats the web to which moisture is added. The heating unit has a first portion that comes in contact with the one surface of the web and a second portion that comes in contact with another surface of the web, and the heating unit heats the web in a state of a surface temperature of the first portion being higher than a surface temperature of the second portion.