EP0550230B1 - Traitement de feutre - Google Patents

Traitement de feutre Download PDF

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Publication number
EP0550230B1
EP0550230B1 EP92311638A EP92311638A EP0550230B1 EP 0550230 B1 EP0550230 B1 EP 0550230B1 EP 92311638 A EP92311638 A EP 92311638A EP 92311638 A EP92311638 A EP 92311638A EP 0550230 B1 EP0550230 B1 EP 0550230B1
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EP
European Patent Office
Prior art keywords
felts
fatty acid
felt
process according
pitch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92311638A
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German (de)
English (en)
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EP0550230A1 (fr
Inventor
Clarice Awino Owiti
Abdul Qavi Khan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BetzDearborn Europe Inc
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Betz Europe Inc
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Publication date
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Classifications

    • 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
    • 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
    • D21H17/07—Nitrogen-containing compounds

Definitions

  • the present invention relates to inhibiting the deposition of particulate materials in the press felts of a papermaking operation. Specifically, this invention pertains to the use of a press felt conditioner directed at controlling the deposition of polymerically flocculated particulate materials, especially in neutral to alkaline papermaking systems.
  • ionically charged, relatively high molecular weight, water soluble polymers are often employed to enhance retention of cellulosic fibres, fines, and inorganic fillers.
  • the addition of these polymers produces a cleaner process stream by reducing the solids level in the process filtrate.
  • the high molecular weight, ionically charged polymers control solids by adsorbing onto solid particulate surfaces in the papermaking furnish slurry and invoking charge neutralization (coagulation) and/or bridging (flocculation) mechanisms which cause the solid particles to flocculate.
  • the flocculate can be retained by the formed mat of cellulosic fibres more easily than smaller individual particles.
  • flocculated particulate materials can be transferred from the surface of the sheet to the papermachine press felts. In the flocculated state, the particles cannot pass through the fine, porous structure of the press felt(s) and become entrapped therein. If not controlled by adequate felt conditioning practices, these agglomerated particulate substances can severely impair the ability of the press felts to absorb water thereby requiring reduced production rates and shortening the useful life of the felts. In addition, it has been found that common polymeric retention aids can render normally effective prior art felt conditioners useless or marginally effective.
  • Typical polymers employed as retention aids are generally relatively high in molecular weight; for example, copolymers made from monomers such as; acrylic acid, acrylamide, dimethyl/diallyl ammonium chloride, dimethylamine, epichlorohydrin, and ethylene diamine.
  • polymeric retention aids have average molecular weights greater than 1,000,000 and can range up to around 20,000,000 for anionically charged polymers and up to 15,000,000 for cationically charged polymers. These ionically charged polymers adsorb onto the various solid particulate surfaces within the papermaking furnish causing flocculation.
  • US-A- 4 715 931 discloses a process for inhibiting aluminium hydroxide deposition in papermaking systems which comprises adding to the felts a hydroxylated carboxylic acid.
  • carboxylic acid in combination with surfactants, such as octyl phenol ethoxylates, nonyl phenol ethoxylates and others listed therein inhibit aluminium hydroxide deposition and associated organic contaminants.
  • pitch formation is of concern in papermaking systems. Filler materials can become trapped within the organic matrix formed by pitch coalescence compounding deposition problems. Methods of controlling the pitch deposition formation are known in the art.
  • US-A- 4 184 912 discloses a method of preventing pitch formation by dispersing and emulsifying pitch particles in the pulp furnish to an exceptionally fine state and uniformally distributing the particles throughout the finished paper.
  • the pitch deposition is controlled by the addition of a three component formulation comprising a nonionic surfactant plus an anionic surfactant and a low molecular weight anionic polymer. The three component mixture is added to the papermaking pulp system at a point prior to where pitch deposits normally form.
  • US-A- 3 642 572 discloses that polyamidoamines are useful not only as flocculants, but also as retention aids and dewatering agents in papermaking processes. Additional polyamines are disclosed in US-A- 3 893 885 (Ziemann et al) as being useful as retention aids and dewatering agents.
  • EP-A- 0359590 addresses the control of deposits on and within papermill felts by employing the use of a cationic polymer in conjunction with nonionic or cationic surfactants.
  • the base products used to create the cationic polymers preferably contain amine groups.
  • US-A- 4 895 622, (Barnett et al.) discloses a felt conditioner comprising a relatively low molecular weight anionic organic polymer and a hydrophilic anionic or nonionic surfactant.
  • the polymers preferably contain acrylic acid or methacrylic acid moieties.
  • a process for conditioning the felts of a papermaking system in order to inhibit polymeric retention aid flocculated particulate deposition in the felts which comprises applying to the felts a fatty acid imidazoline having the general formula wherein R is an alkyl hydrophobe radical having a carbon chain length of C12 or more.
  • Fatty acid imidazolines as used in the present invention, will provide for an effective continuous press felt conditioning treatment when the press felts are subjected to significant quantities of the aforementioned polymerically flocculated particulate substances originating particularly from coated neutral and alkaline pH papermaking furnishes, with or without sizing agent being present.
  • the choice of the fatty acid imidazoline appears to be critical and the imidazoline used in the present invention falls within a hydrophobe carbon chain length of C12 or greater with the preferred hydrophobe chain length of C18.
  • the felt conditioning agents used in the present invention may be metered into one or more fresh water showers directed onto a press felt on its runs between the press nip and the vacuum or uhle box utilized for dewatering the treated felts.
  • the required amount or concentration of fatty acid imidazoline will depend on, among other things, the volume of shower water employed, the production rate, and the concentration of polymerically flocculated contaminants.
  • the total concentration of fatty acid imidazoline added to the aqueous showering medium is from 10 to 1500 parts per million parts of the aqueous medium.
  • they are added at concentrations from 100 parts to 300 parts per million parts of aqueous showering medium.
  • the paper making system is preferably of a neutral or alkaline pH.
  • the Examples contained herein will demonstrate the unexpected superior responses produced by the present invention.
  • the results were obtained utilizing a continuous press felt conditioning test apparatus and a simulated coated alkaline fine paper contaminant system.
  • the testing incorporates a clean (unused) press felt sample of known initial weight and air permeability placed on a heavy-mesh support screen through which the treated or untreated contaminant solution is pressed.
  • the simulated coated alkaline fine papermaking contaminant test slurry consisted of the following: Ingredient Concentration (ppm) Ground Calcium Carbonate 375.00 Clay 125.00 Fatty ester/fatty acid pitch mixture 50.00 *Coating solids (cured, redispersed 15% slurry) 300.00 Alkaline Size (ASA/starch, 1:3 ratio, 10% slurry) 48.75 Cationic Retention Aid (High Molecular Weight, Cationic Polyacrylamide) 2.00 * Pre-cured coating formulation contains: 5% PVAc latex, 5% SBR latex, 32% Clay, 8% TiO2 and 50% water
  • Table 1 contains data generated in this slurry system showing the performance characteristics of several commercially available surfactants and polymers as defined below, employed in the art for continuous or intermittent conditioning of paper machine press felts in comparison to the fatty acid imidazolines according to the present invention.
  • Table 2 summarizes data generated to evaluate the effectiveness of the present invention in the same slurry system excluding the alkaline size.
  • Alkyl or dialkyl phenol ethoxylates used may be represented by the general structure: where,

Landscapes

  • Paper (AREA)
  • Color Printing (AREA)
  • Filtering Materials (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (6)

  1. Procédé de traitement des feutres d'un système de fabrication de papier afin d'inhiber le dépôt de matière particulaire floculé polymérique d'aide à la rétention dans les feutres qui comporte l'application aux feutres d'un imidazoline d'acide gras ayant la formule générale suivante:
    Figure imgb0007
     dans lequel R est un radical hydrophobe d'alcoyle ayant une longueur de chaîne de carbone de C₁₂ ou plus.
  2. Procédé selon la revendication 1, dans lequel R est un radical hydrophobe d'alcoyle ayant une chaîne de carbone d'une longueur de C₁₈.
  3. Procédé selon la revendication 1 ou 2, dans lequel le système de fabrication de papier est d'un pH neutre ou alcalin.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel le feutre est traité en l'arrosant d'un milieu aqueux contenant l'imidazoline d'acide gras.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel l'imidazoline d'acide gras est ajouté dans une quantité de 10 à 1.500 parties par million de parties du milieu aqueux.
  6. Procédé selon la revendication 5, dans lequel l'imidazoline d'acide gras est ajouté dans une quantité préférée de 100 à 300 parties par million de parties du milieu aqueux.
EP92311638A 1992-01-02 1992-12-21 Traitement de feutre Expired - Lifetime EP0550230B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81620092A 1992-01-02 1992-01-02
US816200 1992-01-02

Publications (2)

Publication Number Publication Date
EP0550230A1 EP0550230A1 (fr) 1993-07-07
EP0550230B1 true EP0550230B1 (fr) 1995-08-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92311638A Expired - Lifetime EP0550230B1 (fr) 1992-01-02 1992-12-21 Traitement de feutre

Country Status (6)

Country Link
EP (1) EP0550230B1 (fr)
AT (1) ATE126557T1 (fr)
CA (1) CA2083406C (fr)
DE (1) DE69204154T2 (fr)
FI (1) FI97553C (fr)
NO (1) NO300226B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9797091B2 (en) 2014-11-25 2017-10-24 Buckman Laboratories International, Inc. Felt conditioner and cleaner

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2131143A1 (fr) * 1993-10-07 1995-04-08 Betzdearborn Inc. Procede servant a empecher le depot de resines conferant la resistance a l'etat humide sur les feutres d'une machine a papier
GB2284833A (en) * 1993-11-02 1995-06-21 Steven Frederick Finch Inhibiting the deposition of sticky particles on paper mill dryer fabrics
DE19519268C1 (de) * 1995-05-31 1997-01-23 Stockhausen Chem Fab Gmbh Verwendung von Mitteln zur Zellstoff- und Papierherstellung
DK174460B1 (da) * 2002-02-08 2003-03-31 Dan Web Holding As Fremgangsmåde til renholdelse af et binder/lim-påføringsapparat, samt et binder/lim-påføringsapparat

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2509743A1 (de) * 1975-03-06 1976-09-23 Basf Ag Geschirrspuelmittel
AR247436A1 (es) * 1988-09-16 1994-12-29 Dearborn Chemical Company Ltd Composicion y medio para controlar el deposito de material pegajoso sobre fieltros de fabrica de papel
DE4020271A1 (de) * 1990-06-26 1992-01-02 Henkel Kgaa Salze von fettsaeureamiden und fettsaeureimidazolinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY vol. 48, no. 7, January 1978, APPLETON US page 740 WENZL 'abstract no.6840' & WOCHENBLATT FÜR PAPIERFABRIKATION vol. 105, no. 16, 1977, pages 619-622 WENZL 'Ein Konzept zur Vermeidung nichtbiologischer Ablagerungen in dem Kreislaufsystem von Papier- und Zellstoffabriken' *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9797091B2 (en) 2014-11-25 2017-10-24 Buckman Laboratories International, Inc. Felt conditioner and cleaner

Also Published As

Publication number Publication date
FI97553C (fi) 1997-01-10
FI97553B (fi) 1996-09-30
FI925886A0 (fi) 1992-12-28
CA2083406A1 (fr) 1993-07-03
CA2083406C (fr) 2004-01-06
ATE126557T1 (de) 1995-09-15
DE69204154T2 (de) 1996-01-04
FI925886A (fi) 1993-07-03
EP0550230A1 (fr) 1993-07-07
DE69204154D1 (de) 1995-09-21
NO925022L (no) 1993-07-05
NO300226B1 (no) 1997-04-28
NO925022D0 (no) 1992-12-28

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