WO2000056957A1 - Synthetic monofilament - Google Patents

Synthetic monofilament Download PDF

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Publication number
WO2000056957A1
WO2000056957A1 PCT/EP2000/001114 EP0001114W WO0056957A1 WO 2000056957 A1 WO2000056957 A1 WO 2000056957A1 EP 0001114 W EP0001114 W EP 0001114W WO 0056957 A1 WO0056957 A1 WO 0056957A1
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WO
WIPO (PCT)
Prior art keywords
monofilament
polybutylene terephthalate
polyurethane
synthetic fiber
synthetic
Prior art date
Application number
PCT/EP2000/001114
Other languages
German (de)
French (fr)
Inventor
Hans Hinterkeuser
Original Assignee
Hahl Filaments Gmbh & Co. Kg
Priority date (The priority date 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 date listed.)
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Publication date
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Application filed by Hahl Filaments Gmbh & Co. Kg filed Critical Hahl Filaments Gmbh & Co. Kg
Priority to EP00920434A priority Critical patent/EP1169501B1/en
Priority to AT00920434T priority patent/ATE282102T1/en
Priority to DE50008599T priority patent/DE50008599D1/en
Publication of WO2000056957A1 publication Critical patent/WO2000056957A1/en

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Classifications

    • 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
    • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters

Definitions

  • the invention relates to monofilament synthetic fibers based on polybutylene terephthalate.
  • Monofilament synthetic fibers made from polybutylene terephthalate are known (e.g. Hans-Jürgen Saechtling: Plastic Pocket Book, 22nd edition, 1983, page 298 ff., Carl Hanser-Verlag, Kunststoff). These monofilaments can be used, for example, for the production of fabrics and screens for paper machines. Since such monofilaments are subjected to particularly high mechanical and chemical stresses in use, efforts are being made to improve such mechanical fibers based on polybutylene terephthalate with regard to their mechanical and chemical properties.
  • PBT polybutylene terephthalate
  • the object of the invention is to provide a synthetic fiber based on polybutylene terephthalate which, compared to synthetic fibers made of pure polybutylene terephthalate, has better properties with regard to abrasion resistance and dimensional stability, but is nevertheless sufficiently flexible.
  • This object is achieved according to the invention with a monofilament synthetic fiber of the type mentioned at the outset by a mixture of polybutylene terephthalate and polyurethane. It was surprisingly found that the admixture of polyurethane synthetic fibers made of polybutylene terephthalate can significantly improve many properties.
  • the addition of polyurethane primarily has the effect that the abrasion which arises due to the contact between the fabric and the drive rollers, for example in the paper machine, is substantially reduced.
  • a monofilament synthetic fiber according to the invention can be produced by the usual extrusion spinning process.
  • Raw material dry air dryers ensure in advance that the raw material mixture which is fed to the extruder does not have too high a moisture content.
  • extruders single as well as twin screws with and without degassing are used. All other parts of the plant correspond to the technical conditions necessary for standard monofilament production.
  • a composition of 1-30% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate has proven to be advantageous, with a composition of 1 to 10% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate being particularly advantageous in most applications.
  • the monofilament synthetic fiber according to the invention is particularly preferably suitable for the production of fabrics or sieves, in particular for paper machine clothing. These paper machine clothing can be used in the paper machine both in the wire section and in the press section as well as in the dryer section.
  • a state-of-the-art synthetic fiber made of pure polybutylene terephthalate was first examined, with a thread diameter of 0.22 mm. This Fa The diameter was examined because such a thread is frequently used in the wet felt area in paper machines.
  • This synthetic fiber is referred to below as synthetic fiber I.
  • a monofilament synthetic fiber according to the invention with the following composition was examined: 95.0% by weight of polybutylene terephthalate and 5.0% by weight of polyurethane, this fiber is referred to below as synthetic fiber II. It also had a diameter of 0.22 mm.
  • the mechanical properties can be significantly improved with an artificial fiber according to the invention.
  • the abrasion can be reduced by more than 50%.

Abstract

The aim of the invention is to provide a synthetic monofilament on the basis of polybutyleneterephthalate, whereby said monofilament is provided with better abrasion stability and dimensional stability properties in relation to synthetic fibres made of pure polybulyeneterephthalate and is sufficiently flexible at the same time. To this end, a synthetic monofilament made of polybutyleneterephthalate and polyurethane is provided.

Description

'Monofile Kunstfaser' 'Monofilament synthetic fiber'
Die Erfindung betrifft monofile Kunstfasern auf Polybutylen- terephthalatbasis .The invention relates to monofilament synthetic fibers based on polybutylene terephthalate.
Monofile Kunstfasern aus Polybutylenterephthalat (PBT) sind bekannt (z.B. HansJürgen Saechtling: Kunststofftaschenbuch, 22. Ausgabe, 1983, Seite 298 ff., Carl Hanser-Verlag, München) . Diese Monofile können beispielsweise zur Produktion von Geweben sowie Sieben für Papiermaschinen eingesetzt werden. Da derartige Monofile im Einsatz insbesondere stark mechanisch und chemisch beansprucht werden, besteht das Bestreben, derartige Kunstfasern auf Polybutylenterephthalat- basis im Hinblick auf ihre mechanischen und chemischen Eigenschaften zu verbessern.Monofilament synthetic fibers made from polybutylene terephthalate (PBT) are known (e.g. Hans-Jürgen Saechtling: Plastic Pocket Book, 22nd edition, 1983, page 298 ff., Carl Hanser-Verlag, Munich). These monofilaments can be used, for example, for the production of fabrics and screens for paper machines. Since such monofilaments are subjected to particularly high mechanical and chemical stresses in use, efforts are being made to improve such mechanical fibers based on polybutylene terephthalate with regard to their mechanical and chemical properties.
Aufgabe der Erfindung ist es, eine Kunstfaser auf Polybuty- lenterephthalatbasis anzugeben, welche gegenüber Kunstfasern aus reinem Polybutylenterephthalat bessere Eigenschaften hinsichtlich der Abriebfestigkeit und Formstabilität aufweist, gleichwohl aber ausreichend flexibel ist.The object of the invention is to provide a synthetic fiber based on polybutylene terephthalate which, compared to synthetic fibers made of pure polybutylene terephthalate, has better properties with regard to abrasion resistance and dimensional stability, but is nevertheless sufficiently flexible.
Diese Aufgabe wird erfindungsgemäß mit einer monofilen Kunstfaser der eingangs bezeichneten Art durch eine Mischung aus Polybutylenterephthalat und Polyurethan gelöst. Es wurde überraschend herausgefunden, daß durch die Beimischung von Polyurethan-Kunstfasern aus Polybutylenterephthalat in vielen Eigenschaften deutlich verbessert werden können. So bewirkt die Beimischung von Polyurethan vor allem, daß der Abrieb, der aufgrund des Kontaktes zwischen dem Gewebe und den Antriebswalzen z.B. in der Papiermaschine entsteht, wesentlich reduziert wird. Außerdem ergibt sich eine Erhöhung der Flexibilität des Monofils und damit ebenso des daraus gebildeten fertigen Gewebes. Dadurch lassen sich größere Gewebe aufgrund der höheren Geschmeidigkeit besser in die einzelnen, mit umlaufenden Walzen bestückten Papiermaschinensektoren einziehen.This object is achieved according to the invention with a monofilament synthetic fiber of the type mentioned at the outset by a mixture of polybutylene terephthalate and polyurethane. It was surprisingly found that the admixture of polyurethane synthetic fibers made of polybutylene terephthalate can significantly improve many properties. The addition of polyurethane primarily has the effect that the abrasion which arises due to the contact between the fabric and the drive rollers, for example in the paper machine, is substantially reduced. In addition, there is an increase in the flexibility of the monofilament and thus also of the finished fabric formed therefrom. This makes it easier for larger fabrics to be drawn into the individual paper machine sectors equipped with rotating rollers because of the greater flexibility.
Darüber hinaus hat sich herausgestellt, daß beim Nadelprozeß, z.B. bei der Herstellung eines Naßfilzes, durch den Zusatz von Polyurethan das Spleißen des Monofils verhindert werden kann. Bei einem derartigen Nadelprozeß ist es nämlich an sich unvermeidbar, daß eine Anzahl von im Gewebe sich befindenden Monofilen durch die einfahrenden Nadeln beschädigt wird.Furthermore, it has been found that in the needle process, e.g. in the production of a wet felt, the addition of polyurethane can prevent the splicing of the monofilament. In such a needle process, it is inevitable that a number of monofilaments in the tissue are damaged by the retracting needles.
Eine erfindungsgemäße monofile Kunstfaser läßt sich nach dem üblichen Extrusionsspinnverfahren herstellen. Rohstoff-Trok- kenlufttrockner sorgen dabei vorab dafür, daß das Rohstoff- gemisch, welches dem Extruder zugeführt wird, nicht einen zu hohen Feuchtigkeitsgehalt aufweist. Als Extruder kommen so- wohl Ein- wie auch Doppelschnecken mit und ohne Entgasung zum Einsatz. Alle übrigen Anlagenteile entsprechen den für die Standardmonofilherstellung notwendigen technischen Bedingungen.A monofilament synthetic fiber according to the invention can be produced by the usual extrusion spinning process. Raw material dry air dryers ensure in advance that the raw material mixture which is fed to the extruder does not have too high a moisture content. As extruders single as well as twin screws with and without degassing are used. All other parts of the plant correspond to the technical conditions necessary for standard monofilament production.
Als vorteilhaft hat sich eine Zusammensetzung von 1 - 30 Gew.% Polyurethan und ad 100 Gew.% Polybutylenterephthalat herausgestellt, wobei in den meisten Anwendungsfällen eine Zusammensetzung von 1 bis 10 Gew.% Polyurethan und ad 100 Gew.% Polybutylenterephthalat besonders vorteilhaft ist.A composition of 1-30% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate has proven to be advantageous, with a composition of 1 to 10% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate being particularly advantageous in most applications.
Besonders bevorzugt eignet sich die erfindungsgemäße monofile Kunstfaser zur Herstellung von Geweben oder Sieben, insbesondere für Papiermaschinenbespannungen. Diese Papiermaschinenbespannungen lassen sich innerhalb der Papiermaschine sowohl in der Siebpartie als auch in der Preßpartie als auch in der Trockenpartie einsetzen.The monofilament synthetic fiber according to the invention is particularly preferably suitable for the production of fabrics or sieves, in particular for paper machine clothing. These paper machine clothing can be used in the paper machine both in the wire section and in the press section as well as in the dryer section.
Die Erfindung ist nachstehend anhand von Ausführungsbeispie- len näher erläutert:The invention is explained in more detail below on the basis of exemplary embodiments:
Beispiel 1:Example 1:
Es wurde zunächst eine dem Stand der Technik entsprechende Kunstfaser aus reinem Polybutylenterephthalat untersucht, und zwar mit einem Fadendurchmesser von 0,22 mm. Dieser Fa- dendurchmesser wurde deshalb untersucht, da im Naßfilzbereich bei Papiermaschinen ein solcher Faden häufig verwendet wird. Diese Kunstfaser wird nachfolgend als Kunstfaser I bezeichnet.A state-of-the-art synthetic fiber made of pure polybutylene terephthalate was first examined, with a thread diameter of 0.22 mm. This Fa The diameter was examined because such a thread is frequently used in the wet felt area in paper machines. This synthetic fiber is referred to below as synthetic fiber I.
Beispiel 2:Example 2:
Demgegenüber wurde eine erfindungsgemäße monofile Kunstfaser mit folgender Zusammensetzung untersucht: 95,0 Gew.% Polybutylenterephthalat und 5,0 Gew.% Polyurethan, diese Faser wird nachfolgend als Kunstfaser II bezeichnet. Sie wies ebenfalls einen Durchmesser von 0,22 mm auf.In contrast, a monofilament synthetic fiber according to the invention with the following composition was examined: 95.0% by weight of polybutylene terephthalate and 5.0% by weight of polyurethane, this fiber is referred to below as synthetic fiber II. It also had a diameter of 0.22 mm.
Beide Kunstfasern wurden jeweils einer Scheuerprüfung unterzogen. Die Ergebnisse sind in der nachfolgenden Tabelle dargestellt:Both synthetic fibers were subjected to a scrubbing test. The results are shown in the table below:
Tabelle:Table:
Figure imgf000006_0001
( Scheuerprüfunσ (trocken) - Drehzahl konstant):
Figure imgf000006_0001
(Abrasion test (dry) - constant speed):
Figure imgf000007_0001
Figure imgf000007_0001
Wie sich aus den vorstehenden Untersuchungsergebnissen ergibt, läßt sich deutlich erkennen, daß gegenüber bekannten Kunstfasern aus reinem Polybutylenterephthalat sich mit einer erfindungsgemäßen Kunstfaser die mechanischen Eigenschaften wesentlich verbessern lassen. Insbesondere läßt sich der Abrieb um mehr als 50 % reduzieren.As can be seen from the above test results, it can be clearly seen that compared to known synthetic fibers made of pure polybutylene terephthalate, the mechanical properties can be significantly improved with an artificial fiber according to the invention. In particular, the abrasion can be reduced by more than 50%.
Natürlich ist die Erfindung nicht auf das dargestellte Ausführungsbeispiel beschränkt. Weitere Ausgestaltungen sind möglich, ohne den Grundgedanken zu verlassen. Of course, the invention is not limited to the exemplary embodiment shown. Further configurations are possible without leaving the basic idea.

Claims

Patentansprüche : Claims:
1. Monofile Kunstfaser auf Polybutylenterephthalatbasis, bestehend aus einer Mischung aus Polybutylenterephthalat und Polyurethan.1. Monofilament synthetic fiber based on polybutylene terephthalate, consisting of a mixture of polybutylene terephthalate and polyurethane.
2. Monofile Kunstfaser nach Anspruch 1, gekennzeichnet durch2. Monofilament synthetic fiber according to claim 1, characterized by
1 - 30 Gew.% Polyurethan und ad 100 Gew.% Polybutylenterephthalat.1 - 30% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate.
3. Monofile Kunstfaser nach Anspruch 2, gekennzeichnet durch3. Monofilament synthetic fiber according to claim 2, characterized by
1 bis 10 Gew.% Polyurethan und ad 100 Gew.% Polybutylenterephthalat .1 to 10% by weight of polyurethane and ad 100% by weight of polybutylene terephthalate.
4. Verwendung einer monofilen Kunstfaser nach einem oder mehreren der Ansprüche 1 bis 3 in Geweben oder Sieben, insbesondere für Papiermaschinenbespannungen. 4. Use of a monofilament synthetic fiber according to one or more of claims 1 to 3 in fabrics or sieves, in particular for paper machine clothing.
PCT/EP2000/001114 1999-03-19 2000-02-11 Synthetic monofilament WO2000056957A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00920434A EP1169501B1 (en) 1999-03-19 2000-02-11 Synthetic monofilament
AT00920434T ATE282102T1 (en) 1999-03-19 2000-02-11 MONOFILE SYNTHETIC FIBER
DE50008599T DE50008599D1 (en) 1999-03-19 2000-02-11 MONOFILE ARTIFICIAL FIBER

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19912371A DE19912371A1 (en) 1999-03-19 1999-03-19 Monofilament synthetic fiber
DE19912371.3 1999-03-19

Publications (1)

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WO2000056957A1 true WO2000056957A1 (en) 2000-09-28

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ID=7901622

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EP (1) EP1169501B1 (en)
AT (1) ATE282102T1 (en)
DE (2) DE19912371A1 (en)
WO (1) WO2000056957A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7435474B2 (en) 2004-07-06 2008-10-14 Voith Patent Gmbh Abrasion resistant monofilament for industrial fabrics

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387395A2 (en) * 1989-03-17 1990-09-19 Jwi Limited Stabilized polyurethane modified polyester forming fabric
US4973512A (en) * 1990-04-03 1990-11-27 Mount Vernon Mills, Inc. Press felt for use in papermaking machine
WO1995026432A1 (en) * 1994-03-25 1995-10-05 Hoechst Aktiengesellschaft Wear resistant polyester-polyurethane mixture with improved processing safety and monofilaments made thereof
WO1999015047A1 (en) * 1997-09-22 1999-04-01 Erwin Hahl Gmbh Plastic bristles for brushes of automatic car washing installations

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387395A2 (en) * 1989-03-17 1990-09-19 Jwi Limited Stabilized polyurethane modified polyester forming fabric
US4973512A (en) * 1990-04-03 1990-11-27 Mount Vernon Mills, Inc. Press felt for use in papermaking machine
WO1995026432A1 (en) * 1994-03-25 1995-10-05 Hoechst Aktiengesellschaft Wear resistant polyester-polyurethane mixture with improved processing safety and monofilaments made thereof
WO1999015047A1 (en) * 1997-09-22 1999-04-01 Erwin Hahl Gmbh Plastic bristles for brushes of automatic car washing installations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7435474B2 (en) 2004-07-06 2008-10-14 Voith Patent Gmbh Abrasion resistant monofilament for industrial fabrics

Also Published As

Publication number Publication date
ATE282102T1 (en) 2004-11-15
DE50008599D1 (en) 2004-12-16
EP1169501B1 (en) 2004-11-10
EP1169501A1 (en) 2002-01-09
DE19912371A1 (en) 2000-09-21

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