EP3359379B1 - Verfahren zur herstellung von reinigungstüchern für druckzylinder - Google Patents

Verfahren zur herstellung von reinigungstüchern für druckzylinder Download PDF

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Publication number
EP3359379B1
EP3359379B1 EP16779062.5A EP16779062A EP3359379B1 EP 3359379 B1 EP3359379 B1 EP 3359379B1 EP 16779062 A EP16779062 A EP 16779062A EP 3359379 B1 EP3359379 B1 EP 3359379B1
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EP
European Patent Office
Prior art keywords
web
cloth
fibers
calendering
range
Prior art date
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Active
Application number
EP16779062.5A
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English (en)
French (fr)
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EP3359379A1 (de
Inventor
Birger Hansson
Ulf ARKENLJUNG
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.)
Baldwin Jimek AB
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Baldwin Jimek AB
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Publication date
Application filed by Baldwin Jimek AB filed Critical Baldwin Jimek AB
Publication of EP3359379A1 publication Critical patent/EP3359379A1/de
Application granted granted Critical
Publication of EP3359379B1 publication Critical patent/EP3359379B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/485—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with weld-bonding
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/50—Selection of materials or products for cleaning

Definitions

  • the present invention relates to cleaning of printing cylinders and more specifically to a method for fabricating a nonwoven cleaning cloth for printing cylinders.
  • the material that is to be printed is often fed trough a system of rollers and cylinders at high speed.
  • the material can be both sheet-fed and web-fed.
  • the ink that is to be printed onto the material is generally applied to the material through contact between a number of ink rollers and contact between a printing cylinder, a blanket cylinder and finally the material that is to be printed.
  • the rollers of the system should be kept clean and ink residues should be avoided. Any other paper residues (e.g. paper lint) also need to be removed during the cleaning. Oftentimes cleaning is performed at regular intervals and especially when a printing series is changed.
  • cloths for cleaning printer cylinders are very demanding, purpose engineered nonwoven textiles are often used due to their high strength and suiting properties.
  • the cloths may be provided with characteristics for increasing abrasion and/or be soaked in solvents that contribute to the removal of ink residues. Market demands are developing towards further enhanced cleaning systems, which means that there is room for improvements.
  • WO2008045340A1 and WO2006089179A1 could be mentioned as examples. Furthermore, applicant's recent WO2015067392A1 should be mentioned as well.
  • This object is achieved by a concept having the features set forth in the appended independent claim; preferred embodiments thereof being defined in the related dependent claims.
  • the present invention provides a method for fabricating a nonwoven cleaning cloth for printing cylinders according to claim 1.
  • a cloth produced according to the first aspect is thus hydroentangled, apertured and calendered in the specified order which gives the cloth improved characteristics over prior art.
  • the apertures increase the abrasive properties of the cloth and allow fluid to easier flow trough the cloth during cleaning. Furthermore, the apertures also increase the ability of the web to remove paper residues such as lint from a roller.
  • the calendering can have the effect of smoothening the surface of the cloth, reducing the thickness and reducing the air content, and in combination with the apertures previously formed it is still possible to achieve an abrasive cloth. Furthermore, by varying the shape and quantity of apertures it is possible to control the abrasive properties of the cloth.
  • the calendering may also provide the advantage of improving bonding of the fibers of the web together thus providing the advantage of reducing the risk of linting, i.e. that fibers are released during cleaning.
  • the calendering also provides compression and extension of the web while reducing air content.
  • the web is embossed after calendering by embossing rollers at least one of which has an impression pattern.
  • the resulting nonwoven, apertured, calendered and embossed cloth is an improved product in relation to prior art.
  • the apertures provide improved abrasive properties while they also let water flow or seep trough the cloth during cleaning.
  • the apertures also provide increased ability to remove paper residues (such as lint) from a roller.
  • the calendering results in a compressed cloth and may efficiently bond the fibers of the web together.
  • the durability and high quality of the embossing can also be ensured since the embossing is the last step after calendering when preparing the cloth before impregnation with a cleaning agent and packaging.
  • the thickness of the web after hydroentangling and aperturing is in the range of 0,4-1,0 mm and the thickness after calendering the web is preferably in the range of 0,2-0,5 mm. It is advantageous that the finished cloth is neither too dense nor too soft and that the finished cloth thickness of the cloth is kept low without risking breakage or loss of function. As the web is fed through the steps in the process, its thickness will decrease and the defined thickness ranges are favorable in regards to achieving an end result which is highly suited for the application at hand.
  • a method for fabricating a nonwoven printer cylinder cleaning cloth from a web comprising synthetic fibers evenly distributed in the web comprises the steps of (i) hydroentangling and aperturing of the web and (ii) embossing of the web by embossing rollers at least one of which has an impression pattern.
  • the synthetic fibers in the web are polyester and/or copolyester and/or olefin fibers.
  • the properties of the web may be controlled.
  • the olefin and copolyester fibers may have a lower melting temperature than polyester fibers.
  • the web comprises two components, the first being synthetic fibers and the second component being an absorbing material such as wood pulp or viscose.
  • the absorbing material increases the ability for the finished cloth to absorb cleaning agent and/or ink residues.
  • the finished cloth may be adapted for advantageous cleaning properties in various printing applications.
  • the synthetic fibers has a lower melting temperature than the absorbing material which means that the temperature of the embossing can be controlled to only melt and/or deform synthetic fibers.
  • the web comprises between 30% to 70% synthetic fibers, preferably about 50% synthetic fibers.
  • the cloth can be adapted to fit various applications.
  • the synthetic fibers will partly melt during the bonding steps in the process, thereby adhering to the absorbing fibers.
  • the above mixture has proven advantageous in absorption of ink and paper residues and release of cleaning agent and in that the finished cloth will not release any fibers onto the roller or cylinder that it is cleaning.
  • the embossing is performed by impression rollers having a temperature in the range of 150 - 190°C, preferably 160 - 180°C and most preferred about 170°C. Embossing in the specified temperature intervals results in a beneficial combination of high bonding of the fibers in the web and high speed of the embossing.
  • the calendering is performed by rollers having a temperature in the range of 10°C - 80°C, preferably 20°C - 30°C.
  • the finished cloth has a basis weight in the range of 60g/m 2 - 120 g/m 2 .
  • a cloth with a basis weight in the mentioned range has beneficial properties, combining high absorption and beneficial thickness with durability and ability to release cleaning agent onto the cylinder/roller that is cleaned.
  • a printing cylinder cleaning cloth which is fabricated according to the method of the teachings herein.
  • An advantage with the obtained cloth is superior cleaning properties in comparison with prior art and improved release of cleaning agent and absorption of ink and paper residues. Furthermore, the cloth can be manufactured more rapidly and/or by using less energy.
  • a process line for manufacturing a nonwoven cleaning cloth 10 for printing cylinders is presented.
  • the web material 1 travels from left to right as seen in Fig. 1 through the steps in the process line as it is being refined into cloth 10 material with properties suited for cleaning of printing cylinders.
  • the fibers that will constitute the web 1 are evenly distributed such that the density of the web 1 will not vary to any considerable extent throughout the web.
  • the web 1 comprises as a first component synthetic fibers, such as polyester and/or copolyester and/or olefin fibers.
  • the synthetic fibers are made of low temperature melting polyester and constitute a first component of the web 1.
  • the low melting temperature of olefin fibers may facilitate processing by enabling the temperature of the embossing and the calendering to be reduced.
  • the web 1 comprises a second component in the shape of absorbing fibers, such as wood pulp (cellulose) or viscose.
  • the web 1 comprises one component being synthetic fibers or two or more components where 30% - 70% are synthetic fibers, more preferably about 50% synthetic fibers, and the remainder absorbing fibers, such as wood pulp or viscose.
  • the finished cloth 10 may have a basis weight in the range of 60g/m 2 - 120 g/m 2 . By varying the basis weight of the cloth 10, it can be adapted to various cleaning applications. The basis weight affects the ability of the cloth 10 to release cleaning agent and to absorb ink and paper residues.
  • the web 1 comprising the fibers mentioned above is fed into the hydroentangling and aperturing stage where the web 1 is subject to a plurality of high power water jets 2.
  • the web 1 is applied to a roller 3 during the hydroentanglement process.
  • the roller 3 could equally be a flat conveyor belt (not shown).
  • Water jets 2 intertwine the fibers of the web 1 such that a nonwoven web 1 is formed.
  • Hydroentanglement, or spunlacing as it is also called, is usually performed with the web 1 having an underlying conveying belt (not shown) contributing to the entangling of the web 1.
  • the belt will have to be perforated accordingly. The perforations of the belt will result in that the high pressure water jets 2 can travel straight through the web 1 and continue through the belt as well, leaving small apertures in the web 1 that correspond to the perforations in the belt.
  • the apertures in a printing cylinder cleaning cloth 10 provide the advantage of increased abrasiveness of the cloth 10 in comparison with regular cloths, and the perforated belt is known in the art as a mesh, the mesh size defining a number of perforations per surface area unit.
  • the mesh size may be in the range of 10-25, and a preferred mesh size is mesh 13.
  • the thickness of the web 1 is reduced by the hydroentangling stage to a thickness of between 0,4 mm and 1,0 mm.
  • the fibers of the web 1 are entangled but they may not yet be sufficiently bonded together. Since it is beneficial that linting is avoided, i.e. that no fibers are detached from the cloth 10 during cleaning, a step further bonding the fibers of the web securely together may be needed. As can be seen in Fig. 1 , this may be performed by calendering rollers 4 forming a nip through which the web 1 is fed. The calendering also provides the advantage of reducing the thickness and air content of the web 1.
  • the calendering step may be performed at temperatures in the range of 10°C - 80°C, or more preferably in the range of 20°C - 30°C.
  • a benefit of the apertured and calendered web 1 is that it will be compressed such that the thickness is reduced, which reduces the size of the final product when the cloth 10 is rolled onto bobbins for packaging.
  • the thickness after calendering is in the approximate range of 0,2 to 0,5 mm corresponding to the thickness of the final product.
  • the air content of the cloth 10 will also be reduced due to the compressing of the web 1.
  • Fig. 2 a variant of the process line is presented.
  • the fibers that will constitute the web 1 are applied evenly distributed onto the conveyor belt (not shown).
  • the web 1 is fed into the hydroentangling step where the web 1 is subjected to a plurality of high power water jets 2.
  • the water jets 2 partly intertwine the fibers of the web 1 such that a nonwoven web 1 is formed.
  • the web 1 is apertured during the hydroentangling stage as described in relation to Fig. 1 .
  • the web 1 is fed to and between a pair of embossing rollers 5 forming a nip through which the web 1 is passed.
  • At least one of the embossing rollers 5 is provided with an impression pattern that is a negative of the pattern that will be embossed onto the web 1.
  • the embossing is performed by heated rollers 5 which melt some of the fibers in the web 1 when the web 1 is put into contact with the impression pattern.
  • the synthetic fibers of the web 1 are melted, thus bonding the fibers of the web together and forming a stable embossing pattern which will increase the abrasive properties of the finished cloth.
  • the temperature at which embossing is performed is preferably in the range of 150-190°C, more preferably in the range of 160°C-180°C and even most preferred approximately 170°C.
  • the thickness of web 1 as it is processed decreases from the unprocessed thickness (i.e. before hydroentagling and aperturing), to a hydroentangled thickness of between 0,4 and 1,0 mm.
  • the embossing will not affect the overall thickness of the web 1 more than in areas which come into contact with the impression roller(s).
  • a cloth 10 which is both apertured and embossed, combining the advantages from both properties and increasing the ability of the cloth 10 to collect and remove ink and paper residues from a printer cylinder.
  • the pattern that is applied to the web 1 when embossing extends essentially perpendicular to the lengthwise direction of the cloth. This will ensure that no stripes form on the cylinders during wiping from the apertures or from possible defects in the cloth 10 material.
  • Fig. 3 a third process line is shown, in which the steps of Figs 1 and 2 have been combined to provide a cleaning cloth 10.
  • fibers of the web 1 are the same as described in Figs 1 and 2 , they will not be presented in further detail.
  • the fibers of the web 1 are distributed evenly on the conveyor belt/process line. Hydroentangling and aperturing bond the fibers of the web together but for further improved bonding, the web 1 is calendered by calendering rolls 4 after hydroentangling and aperturing.
  • the calendering improves surface smoothness of the web 1 and decreases the thickness by 50-60%, from the hydroentangled thickness of in the range of 0,4-1,0 mm to a thickness in the range of 0,2-0,5 mm after calendering.
  • the air content of the web 1 is also reduced.
  • the decreased thickness results in longer sections of cloth 10 can be rolled onto a bobbin (not shown) without increasing the diameter of the finished roll.
  • the third step in the fabrication of the cloth 10 shown in Fig. 3 is the step of embossing the web 1 by the embossing rollers 5.
  • the embossing will not affect the overall thickness of the web 1 since only the portions of the web 1 that come in contact with the protruding impression pattern on the embossing rollers 5 will be compressed.
  • a nonwoven cleaning cloth 10 for printing cylinders from a web 1 comprising synthetic fibers, wherein the web 1 is fed into a process line in which it is hydroentangled and apertured in a first step (roller nip 4) and then calendered in a second step (roller nip 5).
  • the web 1 is impregnated with a cleaning agent (e.g. a solvent), rolled onto a bobbin and packed in a sealed package (not shown).
  • a cleaning agent e.g. a solvent
  • the sealed package will ensure that the cloth 10 is less likely to be damaged, that the cleaning agent is contained in the cloth 10 and that transportation of the cloth is facilitated.
  • the process line is continuous. In fact, this is not always the case since storage of the web 1 between the steps in the process is common. For instance, it might be necessary to dry the web 1 after hydrotentangling to ensure that no water remains in the web 1 when the calendering or embossing is performed. Therefore, a drying step (not shown) can be added between the hydroentangling and the calendering/embossing. The steps of the process can even be performed at completely separate locations with temporary storage of the web 1 between the steps of the process.
  • a third or even a fourth component of the web is possible.
  • such components could be binder fibers, such as olefin fibers, which further increases bonding of the fibers in the web or other fiber materials that increase the abrasive properties of the finished cloth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (9)

  1. Verfahren zur Herstellung eines Reinigungsvliestuchs (10) für Druckzylinder aus einer Bahn (1) mit synthetischen Fasern, die gleichmäßig in der Bahn (1) verteilt sind, wobei die Bahn (1) zwei Komponenten umfasst, wobei die erste die synthetischen Fasern ist und die zweite ein Absorptionsmaterial in Form von Absorptionsfasern wie z. B. Zellstoff oder Viskose ist, und wobei die Bahn (1) zwischen 30 % und 70 % synthetische Fasern umfasst, wobei das Verfahren die Schritte umfasst:
    - Wasserstrahlverfestigen und Perforieren der Bahn (1), und
    - Kalandrieren der Bahn (1) durch Kompression zwischen Kalanderwalzen (4), um die Dicke und den Luftgehalt der Bahn (1) zu verringern.
  2. Verfahren nach Anspruch 1, wobei die Dicke der Bahn (1) nach dem Wasserstrahlverfestigen und Perforieren im Bereich von 0,4 - 1,0 mm liegt.
  3. Verfahren nach Anspruch 1, wobei die Dicke der Bahn (1) nach dem Wasserstrahlverfestigen und Perforieren im Bereich von 0,4 - 1,0 mm liegt und die Dicke nach dem Kalandrieren der Bahn (1) im Bereich von 0,2 - 0,5 mm liegt.
  4. Verfahren nach einem der vorangehenden Ansprüche, wobei die synthetischen Fasern Polyester- und/oder Copolyester- und/oder Olefinfasern sind.
  5. Verfahren nach einem der vorangehenden Ansprüche, wobei die synthetischen Fasern eine niedrigere Schmelztemperatur als das Absorptionsmaterial aufweisen.
  6. Verfahren nach einem der vorangehenden Ansprüche, wobei das Kalandrieren durch Walzen (4) mit einer Temperatur im Bereich von 10 °C - 80 °C, vorzugsweise 20 °C - 30 °C, durchgeführt wird.
  7. Verfahren nach einem der vorangehenden Ansprüche, wobei das fertige Tuch (10) ein Flächengewicht im Bereich von 60 g/m2 - 120 g/m2 aufweist.
  8. Verfahren nach einem der vorangehenden Ansprüche, das ferner einen Schritt zum weiteren sicheren Zusammenbinden der Fasern der Bahn (1) durch Kalanderwalzen (4) umfasst, die einen Walzenspalt bilden, durch den die Bahn (1) vorgeschoben wird.
  9. Verfahren nach einem der vorangehenden Ansprüche, wobei das Perforieren der Bahn (1) durch ein Netz mit einer Maschenweite im Bereich von 10 - 25 durchgeführt wird.
EP16779062.5A 2015-10-09 2016-10-07 Verfahren zur herstellung von reinigungstüchern für druckzylinder Active EP3359379B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1551309 2015-10-09
PCT/EP2016/073957 WO2017060402A1 (en) 2015-10-09 2016-10-07 Method for fabricating cleaning cloths

Publications (2)

Publication Number Publication Date
EP3359379A1 EP3359379A1 (de) 2018-08-15
EP3359379B1 true EP3359379B1 (de) 2020-01-01

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EP16779062.5A Active EP3359379B1 (de) 2015-10-09 2016-10-07 Verfahren zur herstellung von reinigungstüchern für druckzylinder

Country Status (3)

Country Link
EP (1) EP3359379B1 (de)
ES (1) ES2781874T3 (de)
WO (1) WO2017060402A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789793B1 (de) * 1994-11-02 2000-03-22 The Procter & Gamble Company Verfahren zur herstellung von vliesstoffen
DE602006017968D1 (de) * 2005-02-18 2010-12-16 Du Pont Abriebfester vliesstoff zum reinigen von druckern
CA2649356C (en) * 2006-04-10 2015-01-13 First Quality Nonwovens, Inc. Cotendered nonwoven/pulp composite fabric and method for making the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
WO2017060402A1 (en) 2017-04-13
ES2781874T3 (es) 2020-09-08
EP3359379A1 (de) 2018-08-15

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