Abstract: The object of the present invention is to provide a wet paper web transfer belt having excellent wet paper web transfer properties wherein the paper robbing phenomenon in the press part is prevented, a papermaking system having excellent operational stability comprising said wet paper web transfer belt, a papermaking method having excellent operational stability using said wet paper web transfer belt, and a method for producing said wet paper web transfer belt. This is achieved by a wet paper web transfer belt 1 for transferring a wet paper web; wherein it comprises a wet paper web carrying surface 221 carrying a wet paper web W, which is made of a resin layer 22, and wherein the skewness Rsk of the roughness curve of the wet paper web carrying surface 221 is ?0.5 or less.

Abstract: A felt that further equalizes a pressure state under pressurization by a press so as to smooth the surface of a wet paper web without causing marking on the surface thereof and allow water to be uniformly squeezed out from the wet paper web without crushing the wet paper web is provided by a papermaking press felt wherein a difference between a maximum value and a minimum value of an interval between an upper knuckle portion and an upper knuckle portion, an interval between upper and lower knuckle portions, or an interval between a lower knuckle portion and a lower knuckle portion is arranged to be a value corresponding to 1.0 piece or less of an upper warp yarn in a base fabric.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer. The wet paper web contacting surface includes, in the width direction, sheet edge regions for carrying the edge parts of the wet paper web and a center region for carrying the center vicinity of the wet paper web. The arithmetic average roughness Ra1 (?m) of the wet paper web contacting surface in the sheet edge regions is smaller than the arithmetic average roughness Ra2 (?m) of the wet paper web contacting surface in the center region, and prescribed roughness related equations are fulfilled.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer, and the wet paper web contacting surface includes a wet paper web carrying region for carrying the wet paper web. A prescribed relation of the swelling rate in water of the resin layer and the surface roughness of the wet paper web contacting surface is fulfilled in accordance with the basis weight of the base paper of the wet paper web.

Abstract: The object of the present invention is to provide a wet paper web transfer belt wherein the adhesive properties and releasing properties of the wet paper web with the wet paper web contacting surface of conventional wet paper web transfer belts have been further improved and paper robbing and floating edges do not occur. This is achieved by a wet paper web transfer belt in which a polyurethane is integrated with a reinforcing base material comprising a wet paper web-side surface and a machine-side surface, at least the wet paper web-side surface of the reinforcing base material is embedded in the polyurethane, an outer circumferential layer comprising a wet paper web contacting surface is constituted by some of the polyurethane; wherein, at least the outer circumferential layer comprises two different types of fillers including a high-roundness filler with a relatively high roundness and a low-roundness filler with a relatively low roundness.

Abstract: The object of the present invention is to reduce the wear of the doctor blade applied to the wet paper web transfer belt and the wear of the guide rolls supporting the wet paper web transfer belt while maintaining the wear resistance of the wet paper web contacting surface and the machine contacting surface of the wet paper web transfer belt together with the adhesive and releasing properties of the wet paper web on the wet paper web contacting surface of conventional wet paper web transfer belts. This is achieved by a wet paper web transfer belt in which a polyurethane is integrated with a reinforcing base material comprising a wet paper web-side surface and a machine-side surface, at least the wet paper web-side surface of the reinforcing base material is embedded in the polyurethane, an outer circumferential layer comprising a wet paper web contacting surface is constituted by some of the polyurethane; wherein, at least the outer circumferential layer comprises a spherical filler.

Abstract: Press felts for papermaking include a batt fiber layer and a base fabric. The batt fiber layer is integrated into the base fabric. The base fabric includes a ground warp yarn, a ground weft yarn, and an additional warp yarn. The ground warp yarn and the ground weft yarn include monofilament yarns, and the additional warp yarn includes a material different from a material forming the ground warp yarn. The additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the additional warp yarn ascends toward a wet paper web-side surface of the base fabric and descends toward a roll-side surface of the base fabric, relative to the at least one ground warp yarn.

Abstract: A felt that further equalizes a pressure state under pressurization by a press so as to smooth the surface of a wet paper web without causing marking on the surface thereof and allow water to be uniformly squeezed out from the wet paper web without crushing the wet paper web is provided by a papermaking press felt wherein a difference between a maximum value and a minimum value of an interval between an upper knuckle portion and an upper knuckle portion, an interval between upper and lower knuckle portions, or an interval between a lower knuckle portion and a lower knuckle portion is arranged to be a value corresponding to 1.0 piece or less of an upper warp yarn in a base fabric.

Abstract: Provided is a belt for transferring a wet web, wherein any water mark does not appear on made paper even when a rate of feeding the belt for transferring a wet web by a roll is high. The roll side layer surface of the belt for transferring a wet web has the surface structure in which the percentage of a contact area with the roll per unit area is 10% to 75% and a surface roughness Ra is 50-150 ?m.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer, and the wet paper web contacting surface includes a wet paper web carrying region for carrying the wet paper web. A prescribed relation of the swelling rate in water of the resin layer and the surface roughness of the wet paper web contacting surface is fulfilled in accordance with the basis weight of the base paper of the wet paper web.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer. The wet paper web contacting surface includes, in the width direction, sheet edge regions for carrying the edge parts of the wet paper web and a center region for carrying the center vicinity of the wet paper web. The arithmetic average roughness Ra1 (?m) of the wet paper web contacting surface in the sheet edge regions is smaller than the arithmetic average roughness Ra2 (?m) of the wet paper web contacting surface in the center region, and prescribed roughness related equations are fulfilled.

Abstract: Press felts for papermaking include a batt fiber layer and a base fabric. The batt fiber layer is integrated into the base fabric. The base fabric includes a ground warp yarn, a ground weft yarn, and an additional warp yarn. The ground warp yarn and the ground weft yarn include monofilament yarns, and the additional warp yarn includes a material different from a material forming the ground warp yarn. The additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the additional warp yarn ascends toward a wet paper web-side surface of the base fabric and descends toward a roll-side surface of the base fabric, relative to the at least one ground warp yarn.

Abstract: Press felts for papermaking include a batt fiber layer and a base fabric. The batt fiber layer is integrated into the base fabric. The base fabric includes a ground warp yarn, a ground weft yarn, and an additional warp yarn. The ground warp yarn and the ground weft yarn include monofilament yarns, and the additional warp yarn includes a material different from a material forming the ground warp yarn. The additional warp yarn is arranged so that, when the base fabric is viewed in cross-section in a warp yarn direction, the additional warp yarn ascends toward a wet paper web-side surface of the base fabric and descends toward a roll-side surface of the base fabric, relative to the at least one ground warp yarn.

Abstract: A paper making shoe press belt includes a reinforcing fiber substrate and a polyurethane laminate. The reinforcing fiber substrate is embedded in at least one layer of the polyurethane laminate. At least one layer of the polyurethane laminate includes a polyurethane obtained by heat-curing a urethane prepolymer together with a mixed curing agent. The urethane prepolymer includes a terminal isocyanate group and is obtained by reacting a diisocyanate compound and a long-chain polyol. The diisocyanate compound includes at least one of toluene-diisocyanate, diphenylmethane-diisocyanate, and paraphenylene-diisocyanate. The mixed curing agent includes 70-99.5 mol % of dimethylthiotoluenediamine and 0.5-30 mol % of a curing agent. The curing agent includes at least one of diethyltoluenediamine and hydroquinone bis (?-hydroxyethyl) ether. An equivalent ratio of active hydrogen groups of the mixed curing agent to isocyanate groups of the urethane prepolymer is from 1.02 to 1.15.

Abstract: A paper making shoe press belt includes a reinforcing fiber substrate and a polyurethane laminate. The reinforcing fiber substrate is embedded in at least one layer of the polyurethane laminate. At least one layer of the polyurethane laminate includes a polyurethane obtained by heat-curing a urethane prepolymer together with a mixed curing agent. The urethane prepolymer includes a terminal isocyanate group and is obtained by reacting a diisocyanate compound and a long-chain polyol. The diisocyanate compound includes at least one of toluene-diisocyanate, diphenylmethane-diisocyanate, and paraphenylene-diisocyanate. The mixed curing agent includes 70-99.5 mol % of dimethylthiotoluenediamine and 0.5-30 mol % of a curing agent. The curing agent includes at least one of 4,4?-methylenebis(2,6-diethyl-3-chloroaniline), 4,4?-methylenedianiline, and 1,4-butanediol. An equivalent ratio of active hydrogen groups of the mixed curing agent to isocyanate groups of the urethane prepolymer is from 1.02 to 1.15.

Abstract: A belt (shoe press belt) for papermaking machines having good wet paper web water squeezing capability, and wherein damage, cracks, and abrasion of the outer circumferential belt surface during use is small, and due to the reduced abrasion between the cutting chips, the cutter and the groove walls, the cutter life is long and the surface roughness is small. The cross-section in the cross-machine direction of the water draining grooves is provided in the machine direction in the felt-side surface of the shoe press belt and the groove corner parts formed by the groove sidewalls and the groove bottom part of the water draining grooves are chamfered in the shape of a trapezoid or a rectangle.

Abstract: A shoe press belt includes a substrate, a wet paper web-side layer provided on the outer side of the substrate; and a shoe-side layer on the inner side; the wet paper web-side layer and the shoe-side layer are made from a high-polymer elastic material. The surface layer of the wet paper web-side layer includes concave water catching parts and land parts which are projecting parts occurring due to formation of the water catching parts. The occurrence of cracks in the surface part of the land part and the bottom part and corner parts of the water catching part of the shoe press belt is suppressed by setting the hardness of the surface part of the land part at a relatively higher value than the hardness of the bottom part of the water catching part. Thereby, occurrence of cracks in the surface part of the land parts and the bottom part of the water catching part in a shoe press belt having water catching parts and land parts in the surface layer of the wet paper web-side layer can be suppressed.

Abstract: Provided is a belt for transferring a wet web, wherein any water mark does not appear on made paper even when a rate of feeding the belt for transferring a wet web by a roll is high. The roll side layer surface of the belt for transferring a wet web has the surface structure in which the percentage of a contact area with the roll per unit area is 10% to 75% and a surface roughness Ra is 50-150 ?m.

Abstract: A belt for wet-web conveyance which includes a hydrophilic fibrous structure formed by needle punching in a wet-web-side layer thereof and which can be inhibited from increasing in belt width dimension with water absorption of the hydrophilic fibrous structure and from forming base fabric marks. The belt for wet-web conveyance includes a wet-web-side layer including a hydrophilic fibrous structure and a machine-side layer. A base fabric disposed in the belt is constituted of a first woven fabric disposed on the wet-web side and, laminated therewith, a second woven fabric disposed on the press roll side. The first woven fabric is woven from a machine-direction yarn material and a cross-direction yarn material, the machine-direction yarn material being a spun yarn and the cross-direction yarn material being a yarn having a low water absorption.

Abstract: A felt (10) for papermaking according to the present invention has a batt fiber layer comprising batt fibers contained in and integrally combined with a high-polymer elastic material (50). The batt fiber layer contained in the high-polymer elastic material (50) includes hydrophilic 1-methyl-2-pyrrolidone. The felt (10) for papermaking exhibits a hydrophilic capability as a felt structure from an initial phase of use. The felt has a sustained ability to be compressed and recovered for a long period of time and maintains water squeezing function, a wet paper web smoothing function, and a wet paper web feeding function until the end of the period in which the felt is used.