US20190211504A1 - Contamination-preventing agent composition and contamination preventing method - Google Patents

Contamination-preventing agent composition and contamination preventing method Download PDF

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Publication number
US20190211504A1
US20190211504A1 US16/336,816 US201616336816A US2019211504A1 US 20190211504 A1 US20190211504 A1 US 20190211504A1 US 201616336816 A US201616336816 A US 201616336816A US 2019211504 A1 US2019211504 A1 US 2019211504A1
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United States
Prior art keywords
contamination
agent composition
dryer
preventing agent
preventing
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Abandoned
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US16/336,816
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English (en)
Inventor
Hiroshi Sekiya
Daisuke Kobayashi
Hiraku Sawada
Kazuyuki Yusa
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Maintech Co Ltd
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Maintech Co Ltd
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Assigned to MAINTECH CO., LTD. reassignment MAINTECH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEKIYA, HIROSHI, YUSA, KAZUYUKI, SAWADA, HIRAKU, KOBAYASHI, DAISUKE
Publication of US20190211504A1 publication Critical patent/US20190211504A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/022—Emulsions, e.g. oil in water
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/32—Washing wire-cloths or felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • the present invention relates to a contamination-preventing agent composition and a contamination preventing method, and more particularly to a contamination-preventing agent composition and a contamination preventing method capable of preventing pitch contamination of a plurality of dryers in a dry part of a paper machine.
  • a paper making process in a paper machine generally has a wire part in which a liquid in which pulp is dispersed in water is placed on a mesh (wire) for papermaking and excess water is naturally dropped to obtain a wet paper, a press part for transferring moisture in the wet paper to a felt by passing the wet paper between a pair of press rolls and pressing it by the press rolls via the felt, thereby dewatering the wet paper, a dry part for drying the paper by contacting the wet paper which has passed through the press part with a plurality of heated driers, to obtain a paper, and a reel part for winding the paper on a bar called a spool.
  • a silicone-based contamination-preventing agent composition and a non-silicone contamination-preventing agent composition are known as a contamination-preventing agent composition for preventing pitch contamination in a dry part of a paper making process.
  • silicone-based contamination-preventing agent composition a contamination-preventing agent composition containing a polysiloxane compound having a predetermined chemical structural formula and having from 0.5 to 5 amino-modified groups per molecule of the polysiloxane compound is known (see, e.g., Patent Document 1).
  • non-silicone contamination-preventing agent composition a contamination-preventing agent composition containing a non-silicone oil and an emulsifier for emulsifying the non-silicone oil, wherein the emulsifier is a neutralized product of a fatty acid and an amine compound is known (see, e.g., Patent Document 2).
  • dryinger on the upstream side means a dryer positioned upstream with respect to traveling of a wet paper
  • dryinger on the downstream side means a dryer positioned downstream with respect to traveling of a wet paper
  • a contamination-preventing agent composition containing a low molecular polysiloxane compound having a predetermined chemical structural formula and a polymer polysiloxane compound having a predetermined chemical structural formula, wherein the kinematic viscosity of the low molecular polysiloxane compound at 25° C. is 10 to 300 mm 2 /s, the kinematic viscosity of the polymer polysiloxane compound at 25° C.
  • the number of modified groups per molecule of the low molecular polysiloxane compound is from 0.1 to 3.0
  • the number of modified groups per molecule of the polymer polysiloxane compound is 1.0 to 10
  • the repeating number m of the polysiloxane unit in the low molecular polysiloxane compound and the repeating number n of the polysiloxane unit in the polymer polysiloxane compound satisfy the relationship of 2 m ⁇ n (see, e.g., Patent Document 3).
  • the polymer polysiloxane compound forms a coating film on a dryer on the upstream side, while the low molecular polysiloxane compound transfers to a wet paper and is carried by the wet paper, and the low-molecular polysiloxane compound is re-transferred to a dryer on the downstream side to which the wet paper is guided, hence, pitch contamination of a plurality of dryers can be prevented as a whole.
  • the contamination-preventing agent composition in the above Patent Document 3 the polymer polysiloxane compound to form a coating film is not transferred to the wet paper, and only the low molecular polysiloxane compound is transferred to the wet paper, hence, there is a disadvantage that the amount of re-transfer to the wet paper (hereinafter referred to as “pick-up amount.”) is small, and sufficient amount cannot be imparted to a dryer on the downstream side.
  • the coating film composed of the low-molecular polysiloxane compound is extremely weak and easily re-transferred, there is also a disadvantage that even if it is imparted to a dryer on the downstream side, it is re-transferred again and it is hard to remain on the dryer.
  • the present invention has been made in view of the above circumstances, and has an object of providing a contamination-preventing agent composition and a contamination preventing method which even if the composition is imparted only to a dryer on the upstream side, a sufficient amount of the composition can be imparted to a dryer on the downstream side via a wet paper, and pitch contamination of a plurality of dryers can be prevented sufficiently as a whole.
  • the present inventors have intensively studied to solve the above-described problem and resultantly found that the above-described problem can be solved by allowing the contamination-preventing agent composition to have a constitution containing a re-transfer agent having predetermined physical properties, leading to completion of the present invention.
  • the present invention is (1) a contamination-preventing agent composition imparted to a dryer in a dry part of a paper machine and comprising an emulsion, a re-transfer agent and water, wherein the re-transfer agent has a cloud point of 55° C. or higher and an HLB value of 8 to 15.
  • the present invention is (2) the contamination-preventing agent composition according to (1), wherein the dynamic surface tension value at a lifetime of 100 ms by a maximum bubble pressure method is 65 mN/m or less.
  • the present invention is (3) the contamination-preventing agent composition according to (1) or (2), wherein the dryer is made of cast iron, and the contact angle to the cast iron is 70° or less.
  • the present invention is (4) the contamination-preventing agent composition according to any one of (1) to (3), wherein the re-transfer agent is at least one selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, polyoxyalkylene sorbitan fatty acid ester and polyoxyalkylene sorbitol fatty acid ester.
  • the present invention is (5) the contamination-preventing agent composition according to any one of (1) to (4), wherein the emulsion is composed of a non-silicone oil, water and an emulsifier, and the non-silicone oil is at least one selected from the group consisting of polybutenes, synthetic ester oils, mineral oils, vegetable oils and liquid paraffins.
  • the present invention is (6) the contamination-preventing agent composition according to (5), wherein the compounding ratio of the re-transfer agent with respect to 10% by mass of the non-silicone oil is 0.1% by mass to 10% by mass.
  • the present invention is (7) the contamination-preventing agent composition according to any one of (1) to (6), wherein the compounding ratio of the re-transfer agent is 0.01% by mass to 10% by mass.
  • the present invention is (8) the contamination-preventing agent composition according to any one of (1) to (7), wherein a coating film is formed by being imparted to the dryer, and a part of the coating film is re-emulsified when the coating film comes in contact with a wet paper.
  • the present invention is (9) a contamination preventing method, comprising a first step of imparting the contamination-preventing agent composition according to any one of claims ( 1 ) to ( 7 ) to a dryer on the upstream side to form a coating film, a second step of bringing a wet paper into contact with the coating film to re-emulsify a part of the coating film and transfer the re-emulsified emulsion to the wet paper, and a third step of bringing the wet paper carrying the emulsion into contact with a dryer on the downstream side to impart the emulsion to the downstream dryer.
  • the contamination-preventing agent composition of the present invention moisture is removed by drying of the emulsion to form a coating film, and then a moisture-containing wet paper comes into contact with the film, whereby a part of the coating film is re-emulsified.
  • the coating film contains a re-transfer agent for promoting re-transfer, the re-emulsified contamination-preventing agent composition will promptly re-transfer to the wet paper.
  • re-transfer agent having a cloud point of 55° C. or higher
  • the contamination-preventing agent composition containing a re-transfer agent forms a coating film on a dryer
  • re-transfer of the contamination-preventing agent composition to the wet paper can be promoted without losing the active performance of the re-transfer agent even during heating with the dryer.
  • the temperature of the dryer is generally 55° C. or higher.
  • the compounding ratio of the re-transfer agent is 0.01% by mass to 10% by mass based on the total amount.
  • the pick-up amount of the emulsion obtained by re-emulsification of the coating film onto the wet paper can be improved.
  • a contamination-preventing agent composition is given to a dryer at the most upstream side with respect to traveling of the wet paper, it is possible to impart a sufficient amount even to a dryer on the downstream side via the wet paper.
  • the speed of movement to the interface between the coating film and the wet paper can be made faster by setting the dynamic surface tension value at a lifetime of 100 ms according to the maximum bubble pressure method to 65 mN/m or less.
  • the dryer is made of cast iron, and the contact angle to the cast iron is 70° or less, accordingly, the emulsion easily forms a coating film along the surface of the drier.
  • the effect of re-emulsification can be exerted surely when the re-transfer agent is at least one selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, polyoxyalkylene sorbitan fatty acid ester and polyoxyalkylene sorbitol fatty acid ester.
  • the contamination-preventing agent composition of the present invention when the emulsion is composed of a non-silicone oil, water and an emulsifier, the compounding ratio of the re-transfer agent with respect to 10% by mass of the non-silicone oil is 0.1% by mass to 10% by mass.
  • non-silicone oil is at least one selected from the group consisting of polybutenes, synthetic ester oils, mineral oils, vegetable oils and liquid paraffins
  • a coating film can be easily formed on the dryer, re-emulsification is easily performed, and pitch contamination can be surely prevented.
  • the contamination-preventing agent composition of the present invention forms a coating film by being imparted to a dryer and a part of the coating film is re-emulsified with a re-transfer agent by contact of the coating film with a wet paper, even if the composition is imparted only to a dryer on the upstream side, a sufficient amount of the composition can be imparted to a dryer on the downstream side via the wet paper, and pitch contamination of a plurality of dryers can be prevented sufficiently as a whole.
  • pitch contamination of a plurality of dryers can be prevented sufficiently as a whole via a first step, a second step and a third step by using the contamination-preventing agent composition described above.
  • FIG. 1 is a flowchart showing a contamination preventing method using a contamination-preventing agent composition according to the present embodiment.
  • FIG. 2 is an explanatory diagram for explaining a contamination preventing method according to the present embodiment.
  • FIG. 3 is a schematic diagram showing a dryer using a contamination-preventing agent composition according to the present embodiment.
  • the contamination-preventing agent composition according to the present embodiment can prevent pitch contamination of a dryer by being imparted to the dryer in a dry part of a paper machine.
  • a coating film is formed by being imparted to a drier, thereby preventing pitch contamination of the dryer.
  • the coating film comes into contact with the wet paper, a part of the coating film is re-emulsified, and the contamination-preventing agent composition is transferred to the wet paper.
  • the transferred contamination-preventing agent composition is carried by the wet paper and is imparted also to a dryer on the downstream side.
  • the contamination-preventing agent composition of the present embodiment it is possible to sufficiently prevent pitch contamination as a whole for a plurality of dryers.
  • the dynamic surface tension value at a lifetime of 100 ms by a maximum bubble pressure method is 65 mN/m or less.
  • the speed at which the re-transfer agent moves to the interface between the dryer and the emulsion tends to be delayed as compared with the case where the dynamic surface tension value is within the above range. In this case, emulsification does not occur instantaneously, and the pick-up amount to the wet paper becomes insufficient.
  • the dynamic surface tension value is a value measured in an environment of 25° C. using an automatic dynamic surface tension meter BP-D5 (manufactured by Kyowa Interface Science, Inc.).
  • the contamination-preventing agent composition that the contact angle to cast iron is 70° or less.
  • the contact angle is a value measured in an environment of 25° C. and 50% humidity using DropMaster DMs-401, Teflon needle 18 G.
  • the dryer is generally made of cast iron.
  • the contamination-preventing agent composition when imparted to a dryer, the contamination-preventing agent composition can form a coating film on the surface of the dryer instantaneously by setting the contact angle to cast iron within the above-described range.
  • Cast iron is formed by casting an alloy containing iron as a main component and containing at least one selected from the group consisting of nickel, chromium, carbon and silicon.
  • the cast iron used to measure the contact angle may be the same as or different from the cast iron of a dryer. It is preferable that both of them are cast irons having a ten-point average roughness (Rz) of 0.16 ⁇ m or less, a maximum height (Rmax) of 0.21 ⁇ m or less, and an arithmetic mean roughness (Ra) of 0.04 ⁇ m or less.
  • the emulsion is composed of a non-silicone oil, water and an emulsifier. That is, the non-silicone oil is emulsified with an emulsifier using water as a medium.
  • the non-silicone oils includes mineral oils such as gear oil, dryer oil, turbine oil, spindle oil and the like, vegetable oils such as coconut oil, linseed oil, castor oil, rapeseed oil, corn oil and the like, liquid paraffin, isoparaffin, polyisobutylene, polybutene, maleated polybutene, synthetic ester oil, polyethylene wax, micro wax, 12-hydroxystearic acid and the like. These may be used singly or in combination of two or more.
  • the non-silicone oil is preferably at least one selected from the group consisting of polybutenes, synthetic ester oils, mineral oils, vegetable oils and liquid paraffins from the viewpoint of a film forming property and a pitch contamination preventing property.
  • the emulsifier is not particularly limited, and known nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like are used.
  • the emulsifier is preferably an anionic surfactant or a nonionic surfactant, from the viewpoint of storage stability of the emulsion.
  • the re-transfer agent includes polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl thioethers, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene sorbitol fatty acid esters, glycerin mono-fatty acid esters and the like. These may be used singly or in combination of two or more.
  • the re-transfer agent is preferably at least one selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters and polyoxyalkylene sorbitol fatty acid esters, from the viewpoint of ease of re-emulsification.
  • the re-transfer agent preferably has a cloud point of 55° C. or higher.
  • the function as a re-transfer agent may possibly be lost due to heat of a dryer as compared with the case where the cloud point is within the above range.
  • the cloud point is a temperature at which an aqueous solution containing 1% by mass of the re-transfer agent is heated to become cloudy.
  • the cloud point is a temperature at which a 25% (w/w) diethylene glycol monobutyl ether aqueous solution containing 10% by mass of the re-transfer agent is heated to become cloudy.
  • the re-transfer agent preferably has an HLB value of 8 to 15.
  • the HLB value is a value measured by a known Griffin method.
  • the compounding ratio of the re-transfer agent is preferably 0.01% by mass to 10% by mass with respect to the total amount of the contamination-preventing agent composition.
  • the compounding ratio of the re-transfer agent with respect to the total amount of the contamination-preventing agent composition is less than 0.01% by mass, there is a fear that the re-transfer becomes insufficient and the pick-up amount to the paper decreases, as compared with the case where the compounding ratio of the re-transfer agent is within the above range, while when the compounding ratio of the re-transfer agent with respect to the total amount of the contamination-preventing agent composition exceeds 10% by mass, the re-transfer agent itself bonds to the pitch or the like, which may cause contamination, as compared with the case where the compounding ratio of the re-transfer agent is within the above range.
  • the compounding ratio of the re-transfer agent with respect to 10% by mass of the non-silicone oil is preferably 0.1% by mass to 10% by mass.
  • the compounding ratio of the re-transfer agent with respect to 10% by mass of the non-silicone oil is less than 0.1% by mass, there is a fear that the re-transfer agent cannot sufficiently re-transfer the non-silicone oil, as compared with the case where the compounding ratio of the re-transfer agent is within the above range, while when the compounding ratio of the re-transfer agent with respect to 10% by mass of the non-silicone oil exceeds 10% by mass, there is a fear that the effect of preventing adhesion of pitch contamination by the non-silicone oil becomes insufficient, as compared with the case where the compounding ratio of the re-transfer agent is within the above range.
  • the contamination-preventing agent composition according to the present embodiment is produced by stirring and mixing a non-silicone oil, an emulsifier and water to obtain an emulsion and stirring and mixing the emulsion, a re-transfer agent and water.
  • a hand mixer, a homogenizer and the like are suitably used.
  • they may be dispersed by a dispersing machine such as a sand mill, a bead mill, a ball mill or the like.
  • FIG. 1 is a flowchart showing a contamination preventing method using the contamination-preventing agent composition according to the present embodiment.
  • the contamination preventing method has a first step S 1 of imparting the contamination-preventing agent composition a dryer on the upstream side to form a coating film, a second step S 2 of bringing a wet paper into contact with the coating film to re-emulsify a part of the coating film and transfer the re-emulsified emulsion to the wet paper, and a third step S 3 of bringing the wet paper carrying the emulsion into contact with a dryer on the downstream side to impart the emulsion to the downstream dryer.
  • FIG. 2 is an explanatory diagram for explaining a contamination preventing method according to the present embodiment.
  • the contamination-preventing agent composition is first directly imparted to a dryer 10 on the upstream side of a dry part in the first step S 1 .
  • the dryer 10 is at a high temperature in order to dry a wet paper W. For this reason, in the surface of the dryer 10 , a part of water contained in the contamination-preventing agent composition is evaporated, and a coating film 1 is formed of a non-silicone oil.
  • the coating film 1 contains also a re-transfer agent.
  • the traveling wet paper W comes into contact with a dryer 10 on the upstream side, at the same time as the wet paper W is dried, a part of the coating film 1 on the surface of the dryer 10 is re-emulsified by water contained in the wet paper W.
  • the re-transfer agent is contained in the emulsion 1 a of the re-emulsified contamination-preventing agent composition, the emulsion 1 a is transferred to the wet paper W.
  • the time from imparting the contamination-preventing agent composition to a dryer until the wet paper comes into contact with the dryer is extremely short, and is 40 ms to 160 ms.
  • the wet paper W travels while holding the emulsion 1 a and comes into contact with a dryer 11 on the downstream side.
  • the re-transferred emulsion 1 a is heated again by the dryer 11 on the downstream side to form a coating film.
  • the emulsion 1 a which has not been re-transferred to the dryer 11 on the downstream side is transferred to a dryer on the further downstream side of by the wet paper W, and re-transferred to the dryer in a like manner.
  • a contamination-preventing agent composition is continuously imparted to a dryer 10 on the upstream side, so that an emulsion of the contamination-preventing agent composition is imparted continuously also to a drier 11 on the downstream side via the wet paper W.
  • the contamination-preventing agent composition described above since the contamination-preventing agent composition described above is used, it is possible to increase the pick-up amount of the contamination-preventing agent composition to the wet paper W.
  • FIG. 3 is a schematic diagram showing a dryer using the contamination-preventing agent composition according to the present embodiment.
  • the contamination-preventing agent composition is used in a dry part D.
  • the dry part D includes a wet paper W, a plurality of cylindrical dryers D 1 , D 2 , D 3 , D 4 , D 5 , D 6 , D 7 and D 8 (hereinafter referred to as “D 1 to D 8 ”) for heating and drying the wet paper W, canvases K 1 , K 2 for pressing the wet paper against the dryers D 1 through D 8 , a canvas roll KR for guiding the canvases K 1 , K 2 , a breaker stack roll B for gently adjusting the smoothness and paper thickness of the dried wet paper W, and a calender roll C for adjusting the smoothness and paper thickness of the dried wet paper W.
  • the wet paper W is pressed against the surfaces of the dryers D 1 to D 8 by the canvases K 1 and K 2 . As a result, the wet paper W adheres to the dryers D 1 to D 8 and is simultaneously heated and dried.
  • wet paper W is sandwiched by the breaker stack roll B, and then the wet paper W is densified by the calender roll C.
  • the contamination-preventing agent composition is imparted to the dryer D 1 on the most upstream side of the dry part D at the position of the arrow A.
  • the method of imparting the contamination-preventing agent composition is not particularly limited, and for example, a shower method using a spray nozzle or the like, a spray method, and the like are used.
  • the dryer D 1 After the contamination-preventing agent composition is imparted at the position of the arrow A of the dryer D 1 , the dryer D 1 is rotated to guide the wet paper W and the emulsion of the contamination-preventing agent composition is transferred to the wet paper W.
  • the emulsion of the contamination-preventing agent composition is carried by the wet paper W and re-transferred to a dryer D 3 on the downstream side to which the wet paper is guided, and re-transferred to a dryer D 5 on the further downstream side and re-transferred to a dryer D 7 on the further downstream side.
  • the contamination-preventing agent composition imparted at the position of the arrow A of the dryer D 2 is re-transfers to a dryer D 4 on the downstream side to which the wet paper is guided, and re-transferred to a dryer D 6 on the further downstream side and re-transferred to a dryer D 8 on the further downstream side.
  • the contamination-preventing agent composition or the emulsion thereof is imparted to the dryers D 1 to D 8 as a whole and pitch contamination can be prevented.
  • the spray amount of the contamination-preventing agent composition is preferably 0.02 mg/m 2 to 2.0 mg/m 2 in terms of the nonvolatile component amount per passage area of the wet paper.
  • the contamination-preventing agent composition does not sufficiently adhere to the surface of a dryer and pitch contamination cannot be sufficiently prevented in some cases, as compared with the case where the spray amount is within the above-described range.
  • the spray amount is over 2.0 mg/m 2 , there is a possibility that the contamination-preventing agent composition itself causes contamination, as compared with the case where the spray amount is within the above-described range.
  • the contamination-preventing agent composition according to the present embodiment is composed of an emulsion, a re-transfer agent and water, and may contain additives such as a chelating agent, a pH adjusting agent, a preservative, a dispersing agent, a viscosity adjusting agent, a solid lubricant, a wetting agent, a dusting-preventing agent, a release agent, an adhesive, a surface modification agent, a cleaning agent, a paper strength enhancer, a sizing agent, a retention aid, a water repellent, an oil repellent, an anti-lubricant, a softener and the like.
  • additives such as a chelating agent, a pH adjusting agent, a preservative, a dispersing agent, a viscosity adjusting agent, a solid lubricant, a wetting agent, a dusting-preventing agent, a release agent, an adhesive, a surface modification agent, a cleaning agent, a paper strength enhancer,
  • the contamination-preventing agent composition is imparted to a dryer, but it may be imparted not only to a dryer but also to a canvas, a canvas roll, a calender roll, a breaker stack roll and the like.
  • the dryer is made of cast iron, but it may be made of another material.
  • the dynamic surface tension value at 100 ms of the sample A was 45 mN/m and the contact angle to cast iron was 50°.
  • a sample B of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of another polyoxyalkylene alkyl ether (re-transfer agent, cloud point: 79° C., HLB: 14.7) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample B was 49 mN/m and the contact angle to cast iron was 54°.
  • a sample C of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of polyoxyalkylene sorbitan fatty acid ester (re-transfer agent, cloud point: 60° C. or higher, HLB: 14.9) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample C was 62 mN/m and the contact angle to cast iron was 68°.
  • a sample D of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of castor oil (vegetable oil, non-silicone oil) was used instead of liquid paraffin.
  • castor oil vegetable oil, non-silicone oil
  • the dynamic surface tension value at 100 ms of the sample D was 52 mN/m and the contact angle to cast iron was 60°.
  • a sample E of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of castor oil (vegetable oil, non-silicone oil) was used instead of liquid paraffin and 1 part by mass of polyoxyalkylene fatty acid ester (re-transfer agent, cloud point: 60° C. or higher, HLB: 13.6) was used instead of the polyoxyalkylene alkyl ether.
  • castor oil vegetable oil, non-silicone oil
  • polyoxyalkylene fatty acid ester re-transfer agent, cloud point: 60° C. or higher, HLB: 13.6
  • the dynamic surface tension value at 100 ms of the sample E was 43 mN/m and the contact angle to cast iron was 52°.
  • a sample F of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of ester synthetic oil (non-silicone oil) was used instead of liquid paraffin.
  • the dynamic surface tension value at 100 ms of the sample F was 50 mN/m and the contact angle to cast iron was 62°.
  • a sample G of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of ester synthetic oil (non-silicone oil) was used instead of liquid paraffin and 1 part by mass of polyoxyalkylene sorbitol fatty acid ester (re-transfer agent, cloud point: 80° C. or higher, HLB: 13.8) was used instead of the polyoxyalkylene alkyl ether.
  • ester synthetic oil non-silicone oil
  • polyoxyalkylene sorbitol fatty acid ester re-transfer agent, cloud point: 80° C. or higher, HLB: 13.8
  • the dynamic surface tension value at 100 ms of the sample G was 42 mN/m and the contact angle to cast iron was 50°.
  • a sample H of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that the polyoxyalkylene alkyl ether was not used.
  • the dynamic surface tension value at 100 ms of the sample H was 72 mN/m and the contact angle to cast iron was 102°.
  • a sample I of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of another polyoxyalkylene alkyl ether (cloud point: 53° C., HLB: 6.5) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample I was 66 mN/m and the contact angle to cast iron was 85°.
  • a sample J of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of another polyoxyalkylene alkyl ether (cloud point: 52° C., HLB: 8.0) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample J was 66 mN/m and the contact angle to cast iron was 76°.
  • a sample K of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of another polyoxyalkylene alkyl ether (cloud point: 62° C., HLB: 7.8) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample K was 66 mN/m and the contact angle to cast iron was 79°.
  • a sample L of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 1.0 part by mass of another polyoxyalkylene alkyl ether (cloud point: 100° C. or higher, HLB: 16.0) was used instead of the polyoxyalkylene alkyl ether.
  • the dynamic surface tension value at 100 ms of the sample L was 67 mN/m and the contact angle to cast iron was 85°.
  • a sample M of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of castor oil (vegetable oil, non-silicone oil) was used instead of liquid paraffin and the polyoxyalkylene alkyl ether was not used.
  • castor oil vegetable oil, non-silicone oil
  • the dynamic surface tension value at 100 ms of the sample M was 69 mN/m and the contact angle to cast iron was 82°.
  • a sample N of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of castor oil (vegetable oil, non-silicone oil) was used instead of liquid paraffin and 1.0 part by mass of another polyoxyalkylene alkyl ester (cloud point: 53° C., HLB: 6.5) was used instead of the polyoxyalkylene alkyl ether.
  • castor oil vegetable oil, non-silicone oil
  • the dynamic surface tension value at 100 ms of the sample N was 68 mN/m and the contact angle to cast iron was 78°.
  • a sample O of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of castor oil (vegetable oil, non-silicone oil) was used instead of liquid paraffin and 1.0 part by mass of another polyoxyalkylene alkyl ester (cloud point: 100° C. or higher, HLB: 16.0) was used instead of the polyoxyalkylene alkyl ether.
  • castor oil vegetable oil, non-silicone oil
  • the dynamic surface tension value at 100 ms of the sample O was 68 mN/m and the contact angle to cast iron was 80°.
  • a sample P of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of ester synthetic oil (non-silicone oil) was used instead of liquid paraffin and the polyoxyalkylene alkyl ether was not used.
  • ester synthetic oil non-silicone oil
  • the dynamic surface tension value at 100 ms of the sample P was 70 mN/m and the contact angle to cast iron was 90°.
  • a sample Q of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of ester synthetic oil (non-silicone oil) was used instead of liquid paraffin and 1.0 part by mass of another polyoxyalkylene alkyl ester (cloud point: 53° C., HLB: 6.5) was used instead of the polyoxyalkylene alkyl ether.
  • ester synthetic oil non-silicone oil
  • cloud point 53° C., HLB: 6.5
  • the dynamic surface tension value at 100 ms of the sample Q was 66 mN/m and the contact angle to cast iron was 73°.
  • a sample R of a contamination-preventing agent composition was prepared in the same manner as in Example 1 except that 10 parts by mass of ester synthetic oil (non-silicone oil) was used instead of liquid paraffin and 1.0 part by mass of another polyoxyalkylene alkyl ester (cloud point: 100° C. or higher, HLB: 16.0) was used instead of the polyoxyalkylene alkyl ether.
  • ester synthetic oil non-silicone oil
  • HLB 16.0
  • the dynamic surface tension value at 100 ms of the sample R was 67 mN/m and the contact angle to cast iron was 75°.
  • a 5 ⁇ 25 cm square broad-leaf tree bleached kraft pulp (LBKP) was adjusted to a water content of 60%, which was brought into contact with the sample on the stainless steel plate for 10 seconds at a contact pressure of 30 g/cm 2 . In this way, a part of the sample was transferred to LBKP.
  • a heat-resistant tape (trade name: No. 5413, manufactured by 3 M Japan Co., Ltd.) was pasted so as to sandwich the re-transferred sample, and the sample was heated at 80° C.
  • doctor blades dryer contamination-removing apparatus not shown were placed so as to come into contact with the dryers D 1 , D 3 , D 5 and D 7 , respectively.
  • the contamination-preventing agent composition of the present invention is used by being imparted to a dryer in a dry part at the time of paper making. According to the contamination-preventing agent composition of the present invention, it is possible to prevent pitch contamination of a plurality of dryers as a whole, so that the yield in the production of paper can be greatly improved.

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  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
  • Dispersion Chemistry (AREA)
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JP6999200B1 (ja) 2021-02-09 2022-02-10 株式会社南日本モラブ 製紙工程で用いる汚れ付着防止剤及び汚れ付着防止剤供給装置

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JPS4828001A (ja) 1971-08-15 1973-04-13
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JPS5221525B2 (ja) 1971-12-21 1977-06-11
US4184912A (en) * 1976-08-09 1980-01-22 Nalco Chemical Company Pitch control method
JPH04130190A (ja) * 1990-09-20 1992-05-01 Nippon Oil & Fats Co Ltd 抄紙用ドライヤー表面清浄潤滑剤
US5256254A (en) * 1991-07-12 1993-10-26 Betz Paperchem, Inc. Methods of controlling deposition in a paper machine dryer section
DE19519268C1 (de) * 1995-05-31 1997-01-23 Stockhausen Chem Fab Gmbh Verwendung von Mitteln zur Zellstoff- und Papierherstellung
JP3388450B1 (ja) * 2002-01-11 2003-03-24 株式会社メンテック 抄紙機用汚染防止剤、及びそれを使用した汚染防止方法
TW200508455A (en) * 2003-04-09 2005-03-01 Maintech Co Ltd Method for preventing pollution on a dry part in a paper machine, and anti-pollution agent used for this method
US20050039873A1 (en) * 2003-08-18 2005-02-24 Curham Kevin D. High HLB non-ionic surfactants for use as deposition control agents
JP5616578B2 (ja) * 2008-10-22 2014-10-29 東レ・ダウコーニング株式会社 非硬化型コーティング用組成物
CA2790717A1 (en) * 2010-02-25 2011-09-01 Dow Corning Toray Co., Ltd. Contamination inhibitor
WO2011122050A1 (ja) * 2010-03-31 2011-10-06 株式会社メンテック 汚染防止剤組成物
WO2012168986A1 (ja) * 2011-06-10 2012-12-13 株式会社メンテック 汚染防止剤組成物
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JP6080285B1 (ja) 2017-02-15
KR20190060990A (ko) 2019-06-04
JPWO2018061060A1 (ja) 2018-10-04
AU2016425095A1 (en) 2019-04-18
WO2018061060A1 (ja) 2018-04-05
CA3038777A1 (en) 2018-04-05
AU2016425095B2 (en) 2021-12-16

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