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 paper (10) is disclosed, especially for use in the production of corrugated cardboard. The paper (10) is formed from at least two layers couched together and having different composition and it contains wastepaper fibers and grass fibers. The special feature of the paper is that a first layer of the paper (10) is formed as a support layer (11) and contains a maximum fraction of 30 wt. % of grass fibers, a second layer of the paper (10) forms a top layer (12) with a minimum fraction of 20 wt. % of grass fibers and a maximum fraction of 80 wt. % of wastepaper fibers, and the fraction of grass fibers in the top layer (12) is higher than the fraction of grass fibers in the support layer (11).

The present invention provides tissue webs and products that are manufactured by non-compressive dewatering and/or drying methods, such as through-air drying, where the webs and products comprise cross-linked fiber. The non-compressively dewatered tissue webs and products have improved sheet bulk and z-direction properties. For example, in one embodiment, the invention provides through-air dried tissue products having good sheet bulk and resiliency, such as a sheet bulk greater than about 15 cc/g and Compression Energy (E) greater than about 1.30 N/m. Surprisingly the foregoing products have sufficient strength to withstand use, such as a GMT greater than about 600 g/3″, but are not overly stiff, generally having a Stiffness Index less than about 12.

A formation detection system comprising: (a) one or more sensors and (b) one or more lights that illuminate a location of interest so that the one or more sensors can monitor the location of interest; wherein one of the one or more sensors are located substantially planar with a wire of a paper machine and proximate to a slice opening so that the one of the one or more sensors is adjacent to a cut through so that the one of the one or more sensors is capable of measuring stock above the wire and removed water below the wire, and wherein the one of the one or more sensors is capable of measuring a distance between an impingement location of a stock jet and the wire from a forming board.

The invention relates to a method for forming a three-layer board web, preferably a folding box board (FBB) or a solid bleached (sulfate) board (SBS), in a forming section (300) comprising a multilayer headbox (100) and a forming unit (200). In the method the layers of the three-layer board web are first formed of pulp suspension in the multilayer headbox (100) and fed to only one forming unit (200), which only one forming unit is a gap or combi type twin-wire former, for water removal and for joining the layers of the three-layer board web and water is first removed by a non-pulsating forming shoe (37, 39). The invention also relates to a forming section for forming a three-layer board web, preferably a folding box board (FBB) or a solid bleached (sulfate) board (SBS), which forming section comprises a multilayer headbox (100) and a forming unit (200). The forming unit consist of only one forming unit (200) for water removal and for joining the layers of the three-layer board web and that the one forming unit (200) is a gap or combi type twin-wire former and first water removal means comprises a non-pulsating forming shoe (37, 39).

The present invention relates to a method for producing a paperboard comprising the steps of; providing a furnish comprising cellulosic fibers, applying the furnish on at least one wire to form a web, dewatering the web on said at least one wire by subjecting the web to a pressure above 150 kPa without the use of a press roll nip and thereafter pressing the dewatered web to form a paperboard. The invention also relates to a paperboard and a corrugated board.

Apparatus, systems, and methods for making insulated paper products are disclosed.

The present invention provides tissue webs and products that are manufactured by non-compressive dewatering and/or drying methods, such as through-air drying, where the webs and products comprise cross-linked fiber. The non-compressively dewatered tissue webs and products have improved sheet bulk and z-direction properties. For example, in one embodiment, the invention provides through-air dried tissue products having good sheet bulk and resiliency, such as a sheet bulk greater than about 15 cc/g and Compression Energy (E) greater than about 1.30 N/m. Surprisingly the foregoing products have sufficient strength to withstand use, such as a GMT greater than about 600 g/3, but are not overly stiff, generally having a Stiffness Index less than about 12.

A paper (10) is disclosed, especially for use in the production of corrugated cardboard. The paper (10) is formed from at least two layers couched together and having different composition and it contains wastepaper fibers and grass fibers. The special feature of the paper is that a first layer of the paper (10) is formed as a support layer (11) and contains a maximum fraction of 30 wt. % of grass fibers, a second layer of the paper (10) forms a top layer (12) with a minimum fraction of 20 wt. % of grass fibers and a maximum fraction of 80 wt. % of wastepaper fibers, and the fraction of grass fibers in the top layer (12) is higher than the fraction of grass fibers in the support layer (11).

A method for forming a multi-ply fiber web in which least part of the sizing of the multi-ply fiber web is provided by applying sizing agent in the form of foam by a curtain type application device (C10, C20) in between at least two layers of the multi-ply fiber web in the forming section. The invention also relates to a forming section for a multi-ply fiber web having at least one twin-wire forming part formed between a wire (10) for the bottom layer and a wire (20) for the top layer of the multi-ply fiber web, where the layers are joined, and the treated layers combined. The forming section has a curtain type application device (C10, C20) for applying sizing agent in the form of foam in between two layers of the multi-ply fiber web in the forming section of a multi-ply fiber web production line.