EP1736321A1 - Procédé pour la fabrication d'un papier thermique - Google Patents

Procédé pour la fabrication d'un papier thermique Download PDF

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Publication number
EP1736321A1
EP1736321A1 EP06111373A EP06111373A EP1736321A1 EP 1736321 A1 EP1736321 A1 EP 1736321A1 EP 06111373 A EP06111373 A EP 06111373A EP 06111373 A EP06111373 A EP 06111373A EP 1736321 A1 EP1736321 A1 EP 1736321A1
Authority
EP
European Patent Office
Prior art keywords
nip
paper web
temperature
paper
length
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.)
Withdrawn
Application number
EP06111373A
Other languages
German (de)
English (en)
Inventor
Jörg Dr. Rheims
Rüdiger Dr. Kurtz
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1736321A1 publication Critical patent/EP1736321A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers

Definitions

  • the invention relates to a method for producing thermosensitive paper, wherein a temperature-sensitive coating is applied to a paper web and the paper web provided with the coating is smoothed.
  • thermo-sensitive coating often contains, besides a binder and some secondary components, two dye precursors which, when reacted with each other by melt, produce a mostly black color.
  • the main fields of application of such a thermosensitive paper are fax papers, printer, plotter and label papers.
  • thermosensitive paper is usually smoothed with a soft calender.
  • the coated paper passes through one or more nips, each formed between a hard roll having an unyielding surface and a soft roll having an elastic surface. Since the line would discolor at higher temperatures, supporting the smoothing by higher temperatures is not possible. As a result, the smoothing can be done only by using pressure.
  • a smooth surface is desired. This is possible by increasing the pressure. On the other hand, a greater pressure increase leads to compressive stresses, which can be observed by a reaction of the line, a graying of the surface. With a soft calender it is often not possible to achieve the desired surface quality. Using a soft-soft nip, a nip formed by two soft rollers, improves the situation. The result is still not convincing.
  • the object of the invention is to set the surface quality to desired values.
  • This object is achieved in a method of the type mentioned above in that it uses a flat nip for smoothing, which is formed between a circumferential jacket and a counter-pressure element with circumferential surface, being produced in the nip a mean compressive stress of at least 3.5 MPa.
  • the coated paper web is smoothed out with a relatively low compressive stress compared to the previously used methods, but this is maintained over a longer period of time.
  • the mean compressive stress results from the quotient of line load and length of the wide nip.
  • the exact definition of the length of the wide nip is difficult because there is an inlet area and an outlet area. With “length” is therefore the length of the Concave area meant.
  • the jacket can be formed by the shell of a shoe roll, while the counter-pressure element is formed by a hard roller on which the coated side of the paper web preferably rests.
  • the jacket can also be formed by a circulating belt, which bears against a hard roller.
  • nip with a length in the range of 30 to 150 mm is used.
  • a long nip with a length in the range of 30 to 100 mm.
  • the temperature in the nip is limited to a maximum of 80 ° C. At this temperature limit, no thermally induced discoloration of the coating results. On the other hand, the temperature is already high enough to contribute to the smoothing of the paper web, in particular the coated page.
  • a line load of at least 250 N / mm is selected. This can be easily produce the desired minimum compressive stress.
  • no moisture is applied to the paper web between application of the stroke and smoothing in the nip. So you do not use a moistening device to improve the smoothing result in front of the wide-nip calender. This avoids that both sides of the paper web become too smooth, which could cause problems at the reeling by lateral shifting of the layers ("telescoping effect").
  • the bar is applied without contact.
  • This is a particularly economical measure. It is possible to set the layer thickness of the temperature-sensitive line to a minimum. The forming layer then follows the contour of the surface of the paper web, i. it is not necessary to compensate for the roughness of the web and to fill in "valleys". So you need less material for the stroke. After the application of the line, all areas of the paper web are sufficiently uniformly covered with the temperature-sensitive line.
  • a curtain coater is offered for example by Voith Paper GmbH, 89522 Heidenheim, Germany. With a curtain coater, the line can be applied without contact and with a relatively small thickness.
  • the drawing shows a device 1 for treating a paper web 2.
  • the paper web 2 may have a weight per unit area in the range from 30 to 300 g / m 2 , ie it may also already have a carton-like design.
  • the paper web 2 comes from a paper or board machine 3 shown only schematically. Instead, it can also be unwound from a roll, for example a jumbo roll.
  • the paper web 2 passes in the web running direction 19, a coating device 4, in which a temperature-sensitive bar 5 is applied to the upper surface.
  • the coater 4 is here designed as a "curtain coater", which allows the coating color 6 in the form of a curtain, which is symbolized here by an arrow, to run on the paper web 2.
  • the bar 5 contains, for example, besides a binder and some minor components, two dye precursors which are reacted by melt and which then produce a color.
  • the color is usually black, while the paper web 2 or the unreacted line 5 is white.
  • the main areas of application are fax papers, print, plotter and label papers.
  • the temperature-sensitive bar 5 can be supported by a heat-insulating primer, not shown, which can also be applied with a curtain coater.
  • the coating device 4 has an output device 7, which applies the line 5 to the paper web 2, and a collecting trough 8, in which laterally excess coating color 6 can be accommodated. In a manner not shown, the coating color 6 from the drip tray 8 back to the output device 7 can be performed.
  • a shoe calender 9 is arranged, which has a shoe roll 10 with a circumferential jacket 11 and a support shoe 12.
  • the support shoe 12 has a pressure surface 13, which is provided with non-illustrated means for introducing lubricants, such as hydraulic oil.
  • a counter-roller 14 cooperates, which has a plurality of peripheral holes 15 in order to adjust the temperature at the surface of the counter-roller 14 can.
  • the counter-roller 14 relative to the shoe roll 10 is displaced.
  • the support shoe 12 of the shoe roll 10 is stationary.
  • the counter-roller 14 is thus immersed in the shell 11 of the shoe roll 10. This has the advantage that the jacket 11 does not have to be stretched at its axial ends. There it is usually provided with end discs which rotate about an axis 17.
  • the shoe roll 10 forms with the counter-roller 14 together a broad nip 18, in which the paper web 2 is calendered with the applied temperature-sensitive bar 5.
  • the length of the broad nip 18 in the running direction of the paper web 2 is at least 30 and at most 150 mm, preferably in the range from 30 to 100 mm. "Length” is understood here as the area in which the jacket 11 is concavely pressed.
  • the line load is at least 250 N / mm.
  • the line load is the force with which the jacket 11 of the shoe roll 10 and the counter roll 14 are pressed against each other, based on the axial length of the counter roll.
  • a mean compressive stress of at least 3.5 MPa is set.
  • the mean compressive stress is calculated from the line load divided by the length of the wide nip 18 in the direction of travel.
  • the temperature in the extended nip 18 is not above 80 ° C. This can be achieved, for example, by heating the surface of the counter-roller 14 to a maximum temperature of 80 ° C.
  • the line 5, which rests against the counter-roller 14 and is smoothed by the hard and smooth surface of the counter-roller 14, is thus passed through the thermal impact not discolored.
  • a shoe roll 9 can also use a circumferential elastic band, which is guided by a roller assembly, not shown. Also, you can use a rotating steel strip instead of a counter roll, in which case two support shoes are provided to produce the necessary compressive stress in the extended nip 18.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Paper (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
EP06111373A 2005-06-22 2006-03-20 Procédé pour la fabrication d'un papier thermique Withdrawn EP1736321A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510028822 DE102005028822A1 (de) 2005-06-22 2005-06-22 Verfahren zum Herstellen von thermosensitivem Papier

Publications (1)

Publication Number Publication Date
EP1736321A1 true EP1736321A1 (fr) 2006-12-27

Family

ID=36910976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06111373A Withdrawn EP1736321A1 (fr) 2005-06-22 2006-03-20 Procédé pour la fabrication d'un papier thermique

Country Status (2)

Country Link
EP (1) EP1736321A1 (fr)
DE (1) DE102005028822A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090694A1 (fr) * 2008-02-12 2009-08-19 Voith Patent GmbH Procédé d'application d'un enduit et de lissage combiné
EP2157238A1 (fr) * 2008-08-21 2010-02-24 Voith Patent GmbH Dispositif de production de bandes de matière fibreuse de papier, de carton ou autres revêtues dotées au moins d'une couche thermosensible et procédé de fonctionnement d'un tel dispositif
WO2011088911A1 (fr) * 2010-01-25 2011-07-28 Voith Patent Gmbh Machine à papier thermosensible ou à papier autocopiant et procédé de fabrication de papier thermosensible ou papier autocopiant
CN107100012A (zh) * 2017-05-25 2017-08-29 浙江汉邦化工有限公司 多功能温敏色变窗帘用智能材料

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539225A (en) * 1983-02-23 1985-09-03 Kanzaki Paper Manufacturing Co., Ltd. Method for the production of a heat-sensitive record material
EP1593778A1 (fr) * 2004-05-06 2005-11-09 Voith Paper Patent GmbH Procédé et appareil de traitement d'une bande de papier ou carton
WO2005123411A1 (fr) * 2004-06-17 2005-12-29 Papierfabrik August Koehler Ag Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539225A (en) * 1983-02-23 1985-09-03 Kanzaki Paper Manufacturing Co., Ltd. Method for the production of a heat-sensitive record material
EP1593778A1 (fr) * 2004-05-06 2005-11-09 Voith Paper Patent GmbH Procédé et appareil de traitement d'une bande de papier ou carton
WO2005123411A1 (fr) * 2004-06-17 2005-12-29 Papierfabrik August Koehler Ag Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090694A1 (fr) * 2008-02-12 2009-08-19 Voith Patent GmbH Procédé d'application d'un enduit et de lissage combiné
EP2157238A1 (fr) * 2008-08-21 2010-02-24 Voith Patent GmbH Dispositif de production de bandes de matière fibreuse de papier, de carton ou autres revêtues dotées au moins d'une couche thermosensible et procédé de fonctionnement d'un tel dispositif
WO2011088911A1 (fr) * 2010-01-25 2011-07-28 Voith Patent Gmbh Machine à papier thermosensible ou à papier autocopiant et procédé de fabrication de papier thermosensible ou papier autocopiant
CN107100012A (zh) * 2017-05-25 2017-08-29 浙江汉邦化工有限公司 多功能温敏色变窗帘用智能材料

Also Published As

Publication number Publication date
DE102005028822A1 (de) 2007-01-04

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