EP0392682B1 - Papiermaschinendrucktücher - Google Patents

Papiermaschinendrucktücher Download PDF

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Publication number
EP0392682B1
EP0392682B1 EP90303023A EP90303023A EP0392682B1 EP 0392682 B1 EP0392682 B1 EP 0392682B1 EP 90303023 A EP90303023 A EP 90303023A EP 90303023 A EP90303023 A EP 90303023A EP 0392682 B1 EP0392682 B1 EP 0392682B1
Authority
EP
European Patent Office
Prior art keywords
fibers
polyamide
phenol
intrinsic viscosity
aldehyde
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
EP90303023A
Other languages
English (en)
French (fr)
Other versions
EP0392682A3 (de
EP0392682A2 (de
Inventor
Lionel Normandin
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.)
Albany International Corp
Original Assignee
Albany International Corp
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Filing date
Publication date
Application filed by Albany International Corp filed Critical Albany International Corp
Publication of EP0392682A2 publication Critical patent/EP0392682A2/de
Publication of EP0392682A3 publication Critical patent/EP0392682A3/de
Application granted granted Critical
Publication of EP0392682B1 publication Critical patent/EP0392682B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
    • D06M15/41—Phenol-aldehyde or phenol-ketone resins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides

Definitions

  • This invention relates to paper machine pressing fabrics and has particular reference to paper machine pressing fabrics formed of a polyamide material and having improved longevity and resistance to flattening in the surface layer.
  • a slurry of paper making constituents referred to as "furnish” is deposited on a forming fabric or "wire” and the liquid constituent of the furnish is drawn or extracted through the fabric or wire to produce a self-cohesive sheet.
  • This self-cohesive sheet is then passed to a pressing and then a drying section of the paper making machine.
  • the paper sheet is transported by a pressing fabric to a pair of rollers where the fabric and the paper sheet pass between the nip of the rollers to dewater by mechanical pressure the paper sheet.
  • the paper sheet itself may contain other types of chemical finishes and additives and could be, at the same time, subjected to an elevated temperature in order to aid the dewatering.
  • the paper making pressing fabric together with its sheet of paper tends, therefore, to be subjected to immense pressure at elevated temperatures in a rigorous chemical environment.
  • Paper making pressing fabrics are generally produced by needling batt fiber to a woven base fabric. The fabric has multiple functions: first, to support the formed paper sheet through the press section of the machine; secondly, to accept sheet water expressed at each press nip; and last, to impart a finish or surface texture to the paper sheet.
  • the batt fiber layer constitutes a "cushion" and support for the paper sheet while the woven base provides the primary channels or voids to accept expressed sheet water.
  • the quality of the batt fiber layer and in particular its surface properties and its consistency of surface properties with time, is of extreme importance. As the surface properties of the batt fiber layer deteriorates, so does the quality of the surface of the paper sheet being pressed, as well as, the uniformity of water removal.
  • the batt fibers are bent and deformed under great pressure and at great frequency. Hence the mechanical properties of the batt fiber are of considerable importance in such processes.
  • Polyamide 6 and polyamide 6,6 have been used extensively in the manufacture of paper machine pressing fabrics. These polymers are readily formable as fibers and their fiber characteristics can be controlled to make acceptable paper making pressing fabrics.
  • PA polyamide
  • United States Patent Specification No. US-A-2,434,247 relates to the modification of synthetic linear polyamides with formaldehyde and an alcohol to obtain a more elastic nylon for woven fabrics.
  • United States Patent Specification No. US-A-2,430,953 is concerned with producing nylon yarns with a softer hand, better drape, and in addition, a higher melting point, better dye receptivity and increased resistnce to solvents.
  • the polyamide yarns are reacted with formaldehyde at a pH below 3 in alcohol.
  • United States Patent Specification No. US-A-2,425,334 relates to modification of polyamides with formaldehyde at a pH less than 3 so that they can be cold drawn by no more than 75% of their original lengths.
  • United States Patent Specification No. US-A-3,276,839 describes a process for finishing and dyeing synthetic nylon textile materials in the presence of phenol and an aliphatic anion-active compound in alkaline medium.
  • United States Patent Specification No. US-A-3,322,488 refers to sulfomethylated bisphenol-formaldehyde condensation products used as dye resists for synthetic polyamide fibers.
  • United States Patent Specification No. US-A-2,533,100 relates to a process for treating synthetic linear polyamides with thio derivatives of phenols or their corresponding reduction products.
  • United States Patent Specification No. US-A-2,388,676 is concerned with improving the light stability of polyamide fibers by forming a catecholaldehyde resin within the nylon.
  • nylon materials exhibit improved properties for use in apparrel or decorative assembly, i.e. use in conditions that will not be subjected to the agressive physical and chemical environment of a paper making machine.
  • US-A-3 032 441 discloses a process for treating an open-weave fabric of, for example, nylon yarns comprising applying a phenolic-aldehyde resin and then an amino-aldehyde resin to the fabric, preferably in amounts of 5 - 10% and 10 - 20%, respectively, before curing the resin coating thereon.
  • the process improves the fabric's dimensional stability, abrasion-resistance and stiffness and may be used to treat a Fourdrinier cloth.
  • the present applicant has discovered that a paper making pressing fabric using fibers of various polyamides having an increased amine end group concentration can be further processed and modified to produce significantly improved properties.
  • the present invention provides a polymeric material from the family of polyamides, in which said polymeric material is obtainable by subjecting a polyamide having an amine end group concentration of at least 60 equivalents/106g to a phenol/aldehyde treatment process, the conditions of said treatment process being such that the intrinsic viscosity is increased by at least 4% compared with the intrinsic viscosity of the untreated polyamide.
  • the polymeric material has subsequent to said phenol/aldehyde treatment process been exposed to a heat treatment to further increase the intrinsic viscosity by at least 4%.
  • Said polymeric material may be in the form of fibers.
  • the invention further provides a pressing fabric composed of said fibers.
  • a paper making pressing fabric comprising a fiber layer formed of polymeric fibers, in which said fibers are obtainable from polyamide fibers having an end group concentration such that the amine end group/carboxy end group ratio is greater than 1 by subjecting the polyamide fibers to a phenol/aldehyde treatment process which increases the intrinsic viscosity by at least 4% compared with the intrinsic viscosity of the untreated polyamide fibers.
  • the amine end group concentration of the polyamide fibers before said phenol/aldehyde treatment is at least 60 equivalents/106g.
  • the polyamide may be polyamide 6,6. Where the polyamide is polyamide 6,6, the intrinsic viscosity after the treatment process is preferably not less than 1.3 dl/g.
  • Said fiber layer may be just the surface layer or layers of a batt structure and/or any portion of a batt up to 100% of the batt structure.
  • the fiber layer may be on a base fabric.
  • a method of making a paper making pressing fabric wherein polyamide fibers having an amine end group concentration of at least 60 equivalent/106 gram are subjected to an aldehyde/phenol treatment process in which the fibers are contacted with an aqueous solution of an aldehyde at an elevated temperature and with an aqueous solution of a phenol at an elevated temperature, the treatment process being carried out at a temperature for a time sufficient to impart an increase in intrinsic viscosity of the polyamide of at least 4%, and thereafter forming a layer of said fibers and needling the layer onto a woven base fabric.
  • the fibers may be formed into a batt layer prior to attaching to the base fabric either before or after the aldehyde/phenol treatment process.
  • the woven base fabrics contain yarns of monofilament, multifilament, or spun from staple fibers, that are usually polyamide based
  • the technology of the present invention can be utilized for these yarn forms since they are also exposed to the heat, pressure and chemical environment already described. Benefits of dimensional stability, strength retention and maintenance of water handling capacity are all vital, and will be improved using yarns prepared by this invention.
  • fiber should also not be limited in the sense of size dimensions or shape, but be considered a component. In this sense, therefore, for the purposes of this specification, the use of the term “fiber” should also include “yarns”.
  • Phenols which can be used in this process include phenol, pyrocatechol, resorcinol, hydroquinone, pyrogallol and phloroglucinol, as well as, substituted products of the aforementioned compounds provided at least two reactive sites are left open on the aromatic ring.
  • bisphenols, dihydroxy-naphthalenes and the like could also be utilized.
  • Aldehydes applicable to this process are formaldehyde, formaldehyde liberating compounds, oxaldehyde, malonaldehyde, succinaldehyde, glutaraldehyde, adipaldehyde, pimelaldehyde, suberaldehyde, azelaldehyde and sebacaldehyde, and the like, as well as their substituted counterparts.
  • the treated polyamide batt fibers show an increase in intrinsic viscosity up to 25% depending on the phenolic compound and subsequent heat treatment employed. These fibers also exhibit higher wet elongations relative to standard polyamide fibers both before, but especially after the treatment process. There is also a significant improvement in chemical resistance particularly in terms of resistance to degradation of physical properties caused by oxidation by chlorine containing compounds during use on a paper making machine. Fibers also show increased resistance to abrasion resulting from the pressing of papers containing fillers, such as ground calcium carbonate. Such pressing fabrics have exhibited as much as 100% longer lifetime in use, particularly in hostile chemical and mechanically abrasive environments.
  • Polyamide 6,6 15d staple fiber having an amine end group concentration of 66.4 equivalent/106 gram and an intrinsic viscosity of 1.35 dl/g was subjected to a phenolic treatment process as described below.
  • the fiber was first immersed in an aqueous bath consisting of 0.5% ethylene diamine and 2.0% formaldehyde at 54°C (130°F) for 30 minutes. After a rinse, the fiber is then subjected to a second aqueous solution of 1.5% resorcinol and 1% formaldehyde at 54°C (130°F) for one hour. Followinged by a rinse cycle, the sample was subsequently air dried and heated 10 minutes at 149°C (300°F).
  • Table 1 compares intrinsic viscosities and tensile properties of fiber processed with the above formulation and untreated PA 6,6 fibers having high and low amine end group concentrations.
  • Table 2 includes data describing the properties after exposure to sodium hypochlorite solution in a standard degradation test.
  • Table 3 shows that the treated high amine end group fibers give superior properties in terms of improved ranking on the simulated papermaking press. According to the table, the lower the ranking the better the results.
  • the trial fabric structure utilized was composed of 100% of the modified polyamide fiber, with the addition of the special process steps of the invention.
  • Our trial ran 12 days and was scheduled off.
  • the fabric showed no signs of instability and our analysis of the used fabric revealed low weight loss, no fiber fibrillation and fatigue, and little loss to bulk and water handling capacity.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Polarising Elements (AREA)
  • Artificial Filaments (AREA)
  • Polyamides (AREA)
  • Reinforced Plastic Materials (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Woven Fabrics (AREA)
  • Filtering Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (13)

  1. Ein Polymer-Material aus der Familie der Polyamide, dadurch gekennzeichnet, daß das Polymer-Material erhältlich ist, indem man ein Polyamid mit einer Amin-Endgruppenkonzentration von mindestens 60 Äquivalenten/10⁶g einem Phenol/Aldehyd-Behandlungsprozeß unterwirft, wobei die Bedingungen dieses Behandlungsprozesses derart sind, daß die Strukturviskosität um mindestens 4% erhöht wird im Vergleich mit der Strukturviskosität des unbehandelten Polyamids.
  2. Ein Polymer-Material nach Anspruch 1, das nach dem Phenol/Aldehyd-Behandlungsprozeß einer Wärmebehandlung unterworfen worden ist, um die Strukturviskosität um mindestens 4% weiter zu erhöhen.
  3. Fasern, hergestellt aus dem Polymer-Material nach Anspruch 1 oder Anspruch 2.
  4. Ein Pressentuch, hergestellt aus Fasern nach Anspruch 3.
  5. Ein Papiermaschinen-Pressentuch, umfassend eine Faserschicht, gebildet aus Polymer-Fasern, dadurch gekennzeichnet, daß die Fasern erhältlich sind aus Polyamid-Fasern mit einer Endgruppenkonzentration derart, daß das Verhältnis der Amin-Endgruppen/Carboxy-Endgruppen größer als 1 ist, indem die Polyamid-Fasern einer Phenol/Aldehyd-Behandlung unterworfen werden, die die Strukturviskosität um mindestens 4% erhöht im Vergleich mit der Strukturviskosität der unbehandelten Polyamid-Fasern.
  6. Ein Pressentuch nach Anspruch 5, bei dem die Amin-Endgruppenkonzentration der Polyamid-Fasern vor der Phenol/Aldehyd-Behandlung mindestens 60 Äquivalente/10⁶g beträgt.
  7. Ein Pressentuch nach Anspruch 5, bei dem das Polyamid ein 6,6-Polyamid ist.
  8. Ein Pressentuch nach Anspruch 7, bei dem die Strukturviskosität nach der Behandlung nicht niedriger liegt als 1,3 dl/g.
  9. Ein Pressentuch nach Anspruch 5, bei dem die Faserschicht sich auf einem Basistuch befindet.
  10. Ein Verfahren zum Herstellen eines Papiermaschinen-Preßtuchs, bei dem Polyamid-Fasern mit einer Amin-Endgruppenkonzentration von mindestens 60 Äquivalent/10⁶ Gramm einem Aldehyd/Phenol-Behandlungsprozeß unterworfen werden, in welchem die Fasern mit einer wässrigen Lösung von Aldehyd bei einer erhöhten Temperatur kontaktiert werden sowie mit einer wässrigen Lösung von einem Phenol bei einer erhöhten Temperatur, welche Behandlungen bei einer Temperatur und über eine Zeit ausgeführt werden, die hinreicht, um eine Zunahme der Strukturviskosität des Polyamids von mindestens 4% mit sich zu bringen, und danach eine Schicht dieser Fasern gebildet wird und die Lage auf ein gewebtes Basistuch aufgenadelt wird.
  11. Ein Verfahren nach Anspruch 10, bei dem die Faser in eine Vlieslage geformt wird, bevor sie an dem Basistuch befestigt wird, entweder vor oder nach der Aldehyd/Phenol-Behandlung.
  12. Ein Verfahren nach Anspruch 10, bei dem die Phenole, die bei der Behandlung der Faser verwendet werden, ausgewählt werden aus der Gruppe, bestehend aus Phenol, Pyrocatechol, Resorcin, Hydrochinon, Pyrogallol und Phloroglucin.
  13. Ein Verfahren nach Anspruch 10, bei dem die Aldehyde, die in dem Verfahren eingesetzt werden, ausgewählt werden aus der Gruppe, bestehend aus Formaldehyd, Formaldehyd freisetzenden Verbindungen, Oxaldehyd, Malonaldehyd, Succinaldehyd, Glutaraldehyd, Adipaldehyd, Pimelaldehyd, Suberaldehyd, Azelaldehyd und Sebacaldehyd.
EP90303023A 1989-04-13 1990-03-21 Papiermaschinendrucktücher Expired - Lifetime EP0392682B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US337627 1982-01-07
US33762789A 1989-04-13 1989-04-13

Publications (3)

Publication Number Publication Date
EP0392682A2 EP0392682A2 (de) 1990-10-17
EP0392682A3 EP0392682A3 (de) 1991-03-13
EP0392682B1 true EP0392682B1 (de) 1995-08-16

Family

ID=23321309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90303023A Expired - Lifetime EP0392682B1 (de) 1989-04-13 1990-03-21 Papiermaschinendrucktücher

Country Status (13)

Country Link
EP (1) EP0392682B1 (de)
JP (1) JPH072839B2 (de)
KR (1) KR950013485B1 (de)
AT (1) ATE126526T1 (de)
AU (1) AU626659B2 (de)
CA (1) CA2013852C (de)
DE (1) DE69021612T2 (de)
DK (1) DK0392682T3 (de)
ES (1) ES2078304T3 (de)
FI (1) FI101154B (de)
GR (1) GR3017488T3 (de)
NO (1) NO179711C (de)
ZA (1) ZA902210B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69233624T2 (de) * 1991-02-18 2007-04-26 Albany International Corp. Verbesserung an Papiermaschinengeweben

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388676A (en) * 1942-01-12 1945-11-13 Du Pont Synthetic linear polyamides
US3032441A (en) * 1960-04-18 1962-05-01 Huyck Corp Open weave endless fabric and method for producing the same
EP0159635A2 (de) * 1984-04-12 1985-10-30 E.I. Du Pont De Nemours And Company Verfahren zur Färbbarkeit von Nylon-Teppichfasern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE456355A (de) * 1939-10-07
GB616549A (en) * 1946-04-26 1949-01-24 Dunlop Rubber Co Improvements in and relating to the treatment of nylon thread
DE1469347C3 (de) * 1964-05-25 1974-01-24 Filzfabrik Fulda Gmbh & Co, 6400 Fulda Verfahren zur Herstellung von Schleifartikeln

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388676A (en) * 1942-01-12 1945-11-13 Du Pont Synthetic linear polyamides
US3032441A (en) * 1960-04-18 1962-05-01 Huyck Corp Open weave endless fabric and method for producing the same
EP0159635A2 (de) * 1984-04-12 1985-10-30 E.I. Du Pont De Nemours And Company Verfahren zur Färbbarkeit von Nylon-Teppichfasern

Also Published As

Publication number Publication date
AU5326690A (en) 1990-10-18
AU626659B2 (en) 1992-08-06
KR900016515A (ko) 1990-11-13
DE69021612D1 (de) 1995-09-21
DK0392682T3 (da) 1995-12-11
GR3017488T3 (en) 1995-12-31
EP0392682A3 (de) 1991-03-13
EP0392682A2 (de) 1990-10-17
CA2013852C (en) 2001-01-02
DE69021612T2 (de) 1996-02-08
NO179711C (no) 1996-12-04
NO901281D0 (no) 1990-03-20
JPH032218A (ja) 1991-01-08
KR950013485B1 (ko) 1995-11-08
FI901474A0 (fi) 1990-03-23
CA2013852A1 (en) 1990-10-13
NO179711B (no) 1996-08-26
NO901281L (no) 1990-10-15
ATE126526T1 (de) 1995-09-15
JPH072839B2 (ja) 1995-01-18
ES2078304T3 (es) 1995-12-16
FI101154B (fi) 1998-04-30
ZA902210B (en) 1990-12-28

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