Abstract: A contact roller according to one embodiment includes a cylindrical rubber roll main body, two spiral groove groups provided in a surface of the rubber roll main body, spiral rubber layers which is provided in the groove groups and hardness of which is lower than the rubber roll main body, and a surface rubber layer which covers a surface of the rubber roll main body and hardness of which is lower than that of the rubber roll main body. Nip pressure of the surface rubber layer corresponding to the rubber roll main body is higher than that of the surface rubber layer corresponding to the spiral rubber layers.

Abstract: A contact roller according to one embodiment includes a cylindrical rubber roll main body, two spiral groove groups provided in a surface of the rubber roll main body, spiral rubber layers which is provided in the groove groups and hardness of which is lower than the rubber roll main body, and a surface rubber layer which covers a surface of the rubber roll main body and hardness of which is lower than that of the rubber roll main body. Nip pressure of the surface rubber layer corresponding to the rubber roll main body is higher than that of the surface rubber layer corresponding to the spiral rubber layers.

Abstract: A transfer fabric for conveying wet paper from a sheet forming part to a hydro-extracting part and a papermaking machine using the same are disclosed. A transfer fabric for receiving from a paper forming fabric the wet paper formed by a sheet forming part and delivering the wet paper into a hydro-extracting part as the subsequent step. The transfer fabric is a clothed net produced by preparing as wefts such yarns having both monofilaments and plain threads of a small diameter so bound as to interpose water absorbing gaps therebetween on the running side face side and plain threads of a small diameter so bound as to interpose water absorbing gaps therebetween on the wet paper receiving face side, and as warps monofilaments or twisted monofilaments, laying the wefts in a plurality of layers and the warps in a single layer, and weaving the wefts and said warps.

Abstract: A forming belt and/or a transfer belt which are belts for a forming part of an apparatus for manufacturing a construction material, prevent stains caused by entry of raw material particles and has excellent rigidity and cleanability.

Abstract: To provide a conveyor belt which is light in weight, easy to clean, free from rust, and easy to manufacture, a plastic conveyor belt is formed in an endless shape, by sequentially coupling belt constituent units, each of which comprises a cranked connection piece formed by joining horizontal portions of two plates each having an L-shaped cross section such that vertical portions of the two plates are not located on the same side, a rod which is connected integrally with an inner vertical portion of the connection piece, and has a core-sheath structure consisting of a metal core portion and a plastic sheath portion, a connection shaft provided on one portion of the connection piece, and a connection piece having a connection hole formed in a portion of the connection piece where the connection shaft is not provided.

Abstract: A device 10 for dissolving a coagulant having a rotor chamber 13 supporting rotors 21 around the horizontal axis, wherein a mixture of the coagulant and water is fed to the rotor chamber 13, the liquid level of the mixture is kept at a medium level of the rotors 21, and the mixture can be stirred vertically by means of the rotation of the rotors 21.

Abstract: The apparatus for straightening sheet curls of the present invention is operating in the following processes 1 and 2 when splicing the sheets from the parent rolls:1 The wrap angle adjusting apparatus starts to return one of the main backup rolls and the decurler bar from the position corresponding to the small parent roll to the position corresponding to the large parent roll.2 The apparatus for suddenly changing the wrap angle causes the other of the main backup rolls and the decurler bar to retract from the standard position at which the sheet is pushed inwardly to a position at which the sheet is not pushed inwardly or moderately so as to suddenly change the wrap angle of the sheet substantially at the same timing as the start of return above described in process 1. During this operation, the sheet is guided by the secondary backup rolls, and the wrap angle of the sheet is set to a value appropriate to the diameter of the second parent roll having a large diameter.

Abstract: The present invention provides an apparatus for straightening sheet curls in which a wrap angle .theta. is provided for a sheet wound off from a winding roll by applying a decurler bar to the sheet between two backup rolls, the apparatus comprising a wrap angle adjusting device for adjusting the wrap angle of the sheet by relatively displacing the backup rolls and the decurler bar, and a controller which serves to calculate an optimum wrap angle in accordance with changes in the diameter of the winding roll using the logical equation: .theta.=A/D.sup.q +B (wherein A, B, q are constants which are previously determined) from which the optimum wrap angle .theta. can be calculated for the diameter D of the winding roll, and to control the wrap angle adjusting device on the basis of the results of this calculation. In consequence, the present invention is able to realize automatization of straightening of curls with a simple configuration and in a rapid and highly precise manner.