Abstract: In a shoe press apparatus of a papermaking machine, a press part comprises a roll which serves as a pressing member and a shoe. A belt is sandwiched between the roll and the shoe. A lubricant feeder supplies a lubricant from the outside of the shoe at the upstream side of the shoe. A lubricant holding section, comprising a plurality of grooves is provided on the upstream end of the shoe. Lubricant supplied from the lubricant feeder is held in the lubricant holding section of the shoe, and is more reliably supplied to the press part as the belt runs through the press part. The Structure of the lubricant holding section is comparatively simple, and the lubricant holding section decreases friction, thereby saving energy.

Abstract: In a shoe press belt of a papermaking machine, the part of the paper web-facing layer in which water-holding grooves are formed is composed of a surface sublayer, having a relatively low hardness, and an underlying layer having a relatively high hardness. The higher hardness of the underlying layer prevents cracks from forming where the cross-sectional shape of the grooves tends to change as the belt is compressed. The lower hardness of the surface sublayer prevents the formation of cracks as a result of forces acting on the belt in the direction opposite to the machine direction at the nip location in a papermaking machine.

Abstract: To address the conflict between structural strength and flexibility in a conventional elastic belt for a papermaking calender, and to reduce manufacturing time, a belt in which the paper sheet-facing side of a base body side is covered by a high molecular weight elastic layer, is characterized in that the high molecular weight elastic layer is composed of a dense, first high molecular weight elastic layer and a second, high molecular weight elastic layer having a multitude of small voids of almost the same size. Flexibility of the layer having small voids is achieved while the dense surface layer is adapted to the ruggedness of the paper sheet.

Abstract: This invention relates to a papermaking felt which makes it possible to increase the proportion of the base body thereby preventing flattening without costing extra production man-hour, and to maintain the functions such as the water drainage, wet paper smoothening capability, and wet paper web transport capability throughout its entire use period by.

Abstract: Papermaking felt containing a hydrophilic urethane resin that can maintain functions such as water drainage, wet-paper smoothness, and wet-paper transportability by imparting a hydrophilic property to the papermaking felt thereby preventing the deposition and accumulation of adhesive contaminants without impairing the compression recoverability of the felt thus sustaining its antifouling capability.

Abstract: A relatively low-cost calendering belt having excellent heat resistance and durability comprises a central portion 30, and left and right side portions 20 located at the sides of the central portion. The right and left portions 20 comprise high molecular weight elastic material having greater heat resistance than that of the central portion 30. The central portion 30 is composed of high-molecular elastic material, the durability of which is higher than that of the right and left portions 20. The heat of the calender roll CR is intercepted by a paper W, and consequently is not transmitted to the central portion 30 of the calender belt. The right and left portions 20 of the calender belt, which are not protected by paper W do not deteriorate readily as a result of the heat of the calender roll CR because of their heat resisting property.

Abstract: A press felt for use in a papermaking machine comprises a base body, a batt material and a hydrophilic nonwoven fabric, all intertwiningly integrated by needle punching. The batt material comprises a staple fiber, and is composed of a wet paper web side layer and a press side layer. The hydrophilic nonwoven fabric is provided in the wet paper web side layer. The hydrophilic character of the nonwoven fabric improves the movement of water to the nonwoven fabric, and the holding the water in the nonwoven fabric. As a result rewetting is prevented more effectively than in the case of prior press felts.

Abstract: In a shoe press belt, in which the nip zone is narrower than the shoe width, the shearing force which normally acts on the belt at the outer boundary of the nip zone is made either weak or non-existent by forming the outer portions of the belt of less hardness than the inner, or central, portion of the belt, so that the less hard portions can be positioned directly opposite the outer boundaries of the nip zone. Alternatively, the outer portions of the belt can be made thinner than the central portion of the belt and the thinner portions positioned directly opposite to the nip zone boundaries. The shearing force applied to the belt at the nip ends of the roll is reduced or eliminated, cracking resulting from the shear force is reduced or avoided, and a belt having improved durability results.

Abstract: In a shoe press belt of a papermaking machine, the part of the paper web-facing layer in which water-holding grooves are formed is composed of a surface sublayer, having a relatively low hardness, and an underlying layer having a relatively high hardness. The higher hardness of the underlying layer prevents cracks from forming where the cross-sectional shape of the grooves tends to change as the belt is compressed. The lower hardness of the surface sublayer prevents the formation of cracks as a result of forces acting on the belt in the direction opposite to the machine direction at the nip location in a papermaking machine.

Abstract: A papermaking press felt having excellent rewetting suppression without impaired water-squeezing capability, comprises a base body, batt layers, and a rewetting prevention layer, integrated with one another by needle punching. The rewetting prevention layer has three dimensional passages comprising a verge opening, a wet paper web side opening and a roll side opening. The wet paper web side opening is larger than the roll side opening. Under nip pressure, water from the wet paper web moves into the roll surface side of the felt, passing through the passages in the rewetting prevention layer. Although a rewetting phenomenon tends to occur when the press felt is released from the nip pressure, movement of water through the passages back to the wet paper web side of the felt is suppressed since the roll side openings are narrower than the wet paper web side opening.

Abstract: In a one-surface coated papermaking belt composed of a base layer and a thick resin layer, or a covered, one-surface coated papermaking belt composed of thin and thick resin layers on opposite sides of a base layer, curling of the edges of the belt due to the shrinkage of the thick resin layer is reduced by forming the opposite side edge parts of the thick resin layer thinner than the middle part. The reduction in curling results in improved oil removal especially in a shoe-press belt. It also stabilizes turning of the belt and facilitates belt installation.

Abstract: To improve the water squeezing function of a shoe press belt for papermaking, the wet web side layer of a main body of the belt is composed of a high molecular weight elastic material, and the wet web facing surface of the wet web side layer is made hydrophobic. Water, squeezed from the wet web under compression in a shoe press, and transferred to the surface of the wet web side layer of the belt through a felt, may be shaken off reliably before the belt is again subjected to compression.

Abstract: A shoe press belt for papermaking is composed of heat-resistant base and resin layers, the resin layer containing a filler for either increasing or decreasing its thermal conductivity. The resin layers do not soften at high temperatures, and consequently the dewatering grooves do not deform during the pressing operation. Improved performance is observed both with both types of fillers. In one case external heat is prevented from entering the belt, and in the other case, the resin layers of the belt are not adversely affected by external heat even when they permit entry of heat. The resin layer may be composed of sublayers, some having filler, with the outer layer preferably free of filler so that the surface characteristics of the belt are unaffected. The sublayers may have fillers with different thermal conductivities, proceeding progressively from low to high or from high to low, for improved control over belt temperature.

Abstract: A wet web transfer belt for a closed draw papermaking machine is provided with a rough surface to allow easy release of a wet web. The rough surface is obtained easily, and with reliable quality, by forming the web-contacting side of a batt layer from a welded layer of meltable fiber. A filler is included in the surface portion of the welded layer, extending from the surface at least part way into the welded layer, thereby facilitating the production of projections and concavities which provide the rough surface, and resulting in a wet web transfer belt of stable quality.

Abstract: A papermaking felt which offers excellent elasticity over a long duration comprises a base body (2) and batt layers (3), and a film layer (5) with elongate ridges (4) having their orientation in the CMD direction. The film is arranged in the base body, in the batt layers, or between the layers. The papermaking felt is capable of running flexibly and smoothly in a winding path of a papermaking machine, and is highly resistant to flattening through fatigue, even if subjected to repeated compression under the nip pressure.

Abstract: An easily manufactured shoe press belt for a papermaking machine comprises a high molecular weight cylindrical elastic member having embedded within it, between its inner and outer walls, a multiple layer base member formed by winding a belt-like woven fabric. The layers of the base member are substantially axially coextensive, reinforce the belt against sideward elongation, and achieve uniform hardness and improved durability.

Abstract: A paper-making press felt (1) includes a base member (2) and at least one batt layer (3) laminated on the base member (2), and is characterized in that the base member (2) is made of a plurality of ground fabrics, and in that, of the plurality of ground fabrics, a second ground fabric (B) arranged next to a first ground fabric (A) arranged nearest to a surface (4) on which a wet paper sheet is placed has a structure whose density is higher than or whose air permeability is lower than that of the first ground fabric (A), and can regulate water from moving from the second ground fabric (B) to the first ground fabric (A) and hence can prevent a re-wetting phenomenon effectively.

Abstract: The invention provides a web transfer belt, having good paper releasability, that can be produced with ease and at a low cost without increasing either its hardness or its weight, and a production process therefor. In one embodiment, the web transfer belt includes a high-molecular weight elastic member formed using a resin material mixed with microcapsules (alternatively, closed bubbles or closed bubbles created by a foaming agent), and having a web-receiving face for receiving a web P thereon to transfer, at whose web-receiving face there are provided a multitude of recesses having cut-openings of the microcapsules, such that a water film W easy to be formed between the web-receiving face and the web P can be broken by a large number of recesses.

Abstract: The problem of this invention is to inhibit the infiltration of a lubricating oil supplied to the contact area of the shoe with the belt into the high molecular weight elastic member, and to offer a shoe press belt which has an excellent performance improving durability of the friction surface, preventing flaking off phenomena, cracks, and breakage; and its manufacturing method. An endless shoe press belt the inner portion 1a of which is adapted to contact a shoe S of a papermaking machine, said inner portion 1a being composed of a high molecular weight elastic material, characterized in that the surface of said inner portion is provided with a protective oil 3 comprising an oil the viscosity of which is higher than that of a lubricating oil J supplied to the contact area of said inner portion with said shoe, or a paste-like oil having a certain consistency. It effectively prevents infiltration of the lubricating oil into the surface of the inner portion of the belt.

Abstract: A web transfer belt is provided having a good paper releasability with good paper releasability and having stable surface features. The web transfer belt includes a high-molecular weight elastic member 2 having a web-receiving face 2b for receiving a web P to transfer, and a surface layer forming member 3 disposed on the high-molecular weight elastic weight member 2. A portion of high-molecular weight elastic weight member 2 is exposed on web-receiving face 2b, with one of the web-receiving face 2b and surface layer forming member 3 being made of a hydrophobic material. In this way, water-repellent portions and water-condensing portions are dispersed on the web-receiving face, with recesses and protrusions at fine scales, which can break a water film formed between web-receiving face 2b and web P, and can be easily formed on the web-receiving face 2b.