Abstract: Provided is a paper machine contamination preventive agent that has high fixability to rolls and the like of a paper machine, that positively finds a silicone oil capable of imparting releaseability and water-repellent properties to the rolls or the like immediately upon being supplied to the rolls or the like, and that uses the silicone oil as a main component. Further provided is a paper machine contamination preventive agent using a silicone oil that permits transfer of less foreign matters from a wet paper web than that in a case where a contamination preventive agent containing a dimethylpolysiloxane base oil is a main component. The paper machine contamination preventive agent is fed to a paper machine and has a sidechain-type modified silicone oil or a sidechain both-termini modification silicone oil as a main component.

Abstract: The invention provides a method of preventing contamination of a canvas of a paper machine, whereby antifouling effect on the canvas can always be maintained and precise drying efficiency is ensured. With the method of preventing contamination of the canvas for pressing a paper strip against the surface of drum-dryers used for drying the paper strip in a paper machine, a predetermined amount of a surface treatment agent P is continuously supplied to the surface of the canvases C2, C3, facing the paper strip, in a stage of operation prior to the paper strip being pressed into contact with the canvases C2, C3 as well as the drum-dryers C1, while the paper strip is being fed by operation of the paper machine.

Abstract: The invention provides a method of preventing contamination of a dryer of a paper machine so that predetermined effects of contamination prevention over the long term can always be ensured while maintaining satisfactory drying efficiency. With the method of preventing contamination of the surface of the drum dryer used in a paper machine, a predetermined amount of a surface treatment agent P is continuously supplied to the surface of the drum dryer C1 in rotation, facing a paper strip W, while the paper strip is being fed by the paper machine in operation.

Abstract: The present invention provides a method of spraying antipollution agent which can securely apply a proper amount of antipollution agent to a canvas of a paper machine, a spray nozzle and a slidable spray apparatus used in the spraying method, and antipollution agent. In antipollution agent spraying method of applying antipollution agent (T) to a canvas (A) used for drying paper in a paper machine, the method applies the antipollution agent (T) from a spray nozzle (S) toward a contact start position (C) between an outer surface of the canvas (A) and an out roll (B), applies the antipollution agent (T) to said out roll (B), and transfers and applies the antipollution agent (T) to the canvas (A) via said out roll (B).

Abstract: Provided is a paper machine contamination preventive agent that has high fixability to rolls and the like of a paper machine, that positively finds a silicone oil capable of imparting releaseability and water repellent properties to the rolls or the like immediately upon being supplied to the rolls or the like, and that uses the silicone oil as a main component. Further provided is a paper machine contamination preventive agent using a silicone oil that permits transfer of less foreign matters from a wet paper web than that in a case where a contamination preventive agent containing a dimethylpolysiloxane base oil is as a main component. The paper machine contamination preventive agent is fed to a paper machine has a sidechain-type modified silicone oil or a sidechain both-termini modification silicone oil as a main component.

Abstract: The invention provides a method of preventing contamination of a dryer of a paper machine so that a predetermined anti-fouling effect can always be ensured over a long term while maintaining satisfactory drying efficiency. With the method of preventing contamination of the surface of a drum dryer used in a paper machine, according to the invention, a predetermined amount of a surface forming agent P is continuously supplied to the surface of the drum dryer D1 in rotation, facing a paper strip W, while the paper strip W is being fed by the paper machine in operation.

Abstract: A method of producing core raw paper is provided that prevents corrugation cracking, corrugation cutting or breakage from occurring during corrugating operation using a corrugating roll, prevents the wearing of the corrugating roll, reduces the consumption of driving power and noise, is capable of uniformly and efficiently coating the core raw paper with wax, and does not pollute facilities such as a paper machine.

Abstract: An object of the present invention is to provide a method of preventing the over-adhesion of paper onto the surface of a press roll for a long time and preventing both wear and contamination in a paper machine. To do so, there is adopted a method of, in a press roll in a state in which paper is being supplied by driving a paper machine, preventing the over-adhesion of the paper onto a surface of the press roll, wherein wax whose melting point is lower than the surface temperature of the press roll is continuously supplied to a direct surface of the rotating press roll by the amount of 0.01 to 10 mg/m2, that is a calculation on the basis of passing paper.

Abstract: The object of the present invention is to improve the adhesiveness of the paper body to the surface of a cylindrical Yankee dryer in the manufacturing process of crepe paper products in order to make a high-grade crepe form. This is a manufacturing process of high-grade crepe paper products by attaching a paper body (P) to the surface of a rotating Yankee dryer (Y) and separating said paper body P through a doctor blade (D), wherein a crepe assistant (C) including 0.1 &mgr;g˜10 &mgr;g/m2 of molybdenum disulfide is continuously fed directly onto the surface of the cylindrical Yankee dryer (Y) while the paper body P is continuously fed to the cylindrical Yankee dryer. An improvement in the adhesiveness of the paper body brought about a lower crepe ratio and enabled to manufacture high-grade crepe paper products provided with uniformly fine and delicate crepe “microholds.