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.

Disclosed herein is a method and apparatus for improving the heating capacity of steam-heated hot plates, and in particular, to steam-heated hot plates used in the corrugating industry. One or more separators and thermocompressors are added to the output of the hot plates to separate blow through steam from condensate and pressurize and inject the steam back into the hot plates.

The invention relates to manufacturing low weight high quality paper suitable for use as a support layer of a release liner. A paper web is formed from pulp slurry, the moisture content of the paper web is reduced by a press section (PSEC), the paper web is supported by a belt (BELT1) from a first contact point (CP1) in the press section (PSEC) to a first separation point (SP1) in a drying section (DSEC), and the paper web is dried to form paper. The temperature profile of the paper web may be non-decreasing. When supported, the temperature of the paper web of the paper web may be higher than or equal to 56° C. to obtain a paper web having a dry content of at least 40 wt.-% at the first separation point.

A method of forming a fibrous web including the steps of providing a fiber slurry, depositing the fiber slurry between an inner forming wire and an outer forming wire, wherein the outer forming wire comprises a structured fabric and the inner forming wire contacts a segment of a forming roll, and rotating the forming roll so that the fiber slurry moves into contact with the structured fabric.

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.

A drying hood for drying a fibrous web, such as a tissue paper web, includes a plurality of nozzle boxes for supplying or discharging air and a housing that at least partially surrounds the nozzle boxes. The nozzle boxes are each individually mounted on the housing by a first bearing and a second bearing. The two bearings allow at least one movement of the nozzle box relative to the housing along a longitudinal axis of the nozzle box and/or at least one movement in a direction transverse thereto, along a transverse axis of the nozzle box. The two bearings have translational degrees of freedom differing by one. A drying arrangement having a drying cylinder and the drying hood is also provided.

The present invention relates to a method for the production of a film comprising microfibrillated cellulose, wherein the method comprises the steps of; providing a suspension comprising between 70 weight-% to 100 weight-% of microfibrillated cellulose based on total dry weight, forming a fibrous web of said suspension, drying the web in a drying equipment wherein the web is at least partly dried at a drying rate above 75 kg(H.sub.2O)/m.sup.2/h by use of hot air whereby a film is formed. The invention also relates to a film produce according to the method and a paper or paperboard substrate comprising said film.

A method of forming a fibrous web including the steps of providing a fiber slurry, depositing the fiber slurry between an inner forming wire and an outer forming wire, wherein the outer forming wire comprises a structured fabric and the inner forming wire contacts a segment of a forming roll, and rotating the forming roll so that the fiber slurry moves into contact with the structured fabric.

A pre-dryer for continuous feed or cut sheet systems is described. Such a module can be used in various applications, for example, prior to printing where the time constant for fusing and glossing is long enough that the substrate temperature essentially equilibrates with that of the marking material on the surface of the sheet. The pre-dryer may be part of an image forming device. Substrates, including paper, typically have high moisture content in normal atmospheric conditions. Such substrates may have a moisture content of about 10% water by weight, which is considered high for printing. Such high moisture content in image receiving substrates leads to various artifacts and extends heating times to take the substrate to its glossing temperature that are about four times longer than for dry media. This longer heating time translates to undesirably longer paper paths or nip lengths.

A pre-dryer for continuous feed or cut sheet systems is described. Such a module can be used in various applications, for example, prior to printing where the time constant for fusing and glossing is long enough that the substrate temperature essentially equilibrates with that of the marking material on the surface of the sheet. The pre-dryer may be part of an image forming device. Substrates, including paper, typically have high moisture content in normal atmospheric conditions. Such substrates may have a moisture content of about 10% water by weight, which is considered high for printing. Such high moisture content in image receiving substrates leads to various artifacts and extends heating times to take the substrate to its glossing temperature that are about four times longer than for dry media. This longer heating time translates to undesirably longer paper paths or nip lengths.