EP1316432B1 - Verfahren zum Flexodrucken von einem Zellstoffwatteblatt - Google Patents

Verfahren zum Flexodrucken von einem Zellstoffwatteblatt Download PDF

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Publication number
EP1316432B1
EP1316432B1 EP01403066A EP01403066A EP1316432B1 EP 1316432 B1 EP1316432 B1 EP 1316432B1 EP 01403066 A EP01403066 A EP 01403066A EP 01403066 A EP01403066 A EP 01403066A EP 1316432 B1 EP1316432 B1 EP 1316432B1
Authority
EP
European Patent Office
Prior art keywords
ink
sheet
printed
printing
backing
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
EP01403066A
Other languages
English (en)
French (fr)
Other versions
EP1316432A1 (de
Inventor
Sylvain Breteau
Pierre Laurent
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.)
Essity Operations France SAS
Original Assignee
Georgia Pacific France SAS
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 Georgia Pacific France SAS filed Critical Georgia Pacific France SAS
Priority to EP01403066A priority Critical patent/EP1316432B1/de
Priority to DE60126294T priority patent/DE60126294D1/de
Priority to AT01403066T priority patent/ATE352426T1/de
Priority to PCT/FR2002/003742 priority patent/WO2003045701A1/fr
Publication of EP1316432A1 publication Critical patent/EP1316432A1/de
Application granted granted Critical
Publication of EP1316432B1 publication Critical patent/EP1316432B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/02Letterpress printing, e.g. book printing
    • B41M1/04Flexographic printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/06Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/26Printing on other surfaces than ordinary paper
    • B41M1/36Printing on other surfaces than ordinary paper on pretreated paper, e.g. parchment, oiled paper, paper for registration purposes

Definitions

  • the invention relates to the field of absorbent paper intended for sanitary or domestic use, for example as a household towel, tablecloth napkin.
  • light weight papers ranging from 15 to 35 g / m 2 , generally consisting essentially of wood fibers.
  • chemical additives may for example be added to improve one or the other of the properties: softness, absorption, etc.
  • a papermaking process involves depositing the fibers suspended in water on a fabric to form a sheet.
  • the sheet is drained and then transferred to a felt which will allow to apply it with a press against a drying cylinder.
  • the sheet is peeled off and is creped by means of a doctor blade. It is finally reeled waiting for a transformation into a finished product.
  • Such a technique presented in a summary way, is said to be conventional. It is referred to in the field as CWP. There are of course variants.
  • Another technique is to dry the sheet after dewatering without exerting pressure, in part at least to a sufficient dryness to freeze the fibers within the sheet. If necessary, the drying is completed by applying the sheet to a heated cylinder. Thanks to this first drying, the sheet can be pressed onto the cylinder without destroying its structure. It retains part of its volume. This cylinder also allows its creping. The drying is carried out without pressure by blowing hot air through the sheet after draining.
  • TAD makes it possible to obtain a thicker sheet with a greater mass volume than the conventional technique. It is characterized by a more open structure and greater permeability.
  • one or more color patterns may be printed on the sheet.
  • the flexographic printing technique is generally used. This method uses relief shapes such as flexible plates, made by insolation or with a laser engraved polymer coating, which will apply a liquid ink on the support. These forms are mounted on a cylinder plate. Flexographic printers are well known and can be of different types: central drum, individual back pressures or independent groups.
  • a printer includes an inking system that takes the ink from a reservoir such as a doctor chamber, a screened cylinder or anilox on which microscopic cells have been engraved, and which measures the amount of ink and transfers it to a cliché cylinder.
  • the sheet to be printed is driven between the latter and a counter-pressure cylinder.
  • This method is widely used in the field for its robustness and the quality of printing that it allows.
  • the print medium has a great influence on the quality of printing.
  • the impressions on the sheets of cellulose wadding, CWP on the one hand and TAD on the other hand, performed under the same operating conditions differ substantially.
  • the color palette is reduced.
  • the finesse is less.
  • the Applicant has set a goal of improving the print quality of the cellulose wadding.
  • the process according to the invention comprising at least one printing unit with a plate carrier with which an ink is applied is characterized in that a sub-layer is applied beforehand. limiting the absorption of said ink by the cellulose wadding sheet, on the areas to be printed.
  • the colored ink is deposited by the plate directly on the surface of the sheet. It penetrates part of the substrate by diffusion along the fibers in proportion that is greater as the material has a high absorbency.
  • the coloring part or the pigment which has penetrated deeply into the support no longer fulfills its role, being masked by the surface fibers.
  • the ink also tends to diffuse outside the boundaries of the print pattern.
  • an undercoat varnish is applied.
  • a varnish suitable for this application is based on acrylic resin.
  • the varnish has the composition of an ink without pigment. It consists of about 60% solvent, such as water, about 35% acrylic resin and 5% adjuvants, such as surfactants, drying retarders and pH stabilizers.
  • an ink comprising white pigments, in particular TiO 2 , is applied as an underlayer.
  • Such an ink comprises for example about 60% of dry extract.
  • the dry extract comprises from 40 to 80% of TiO 2 , the remainder being preferably an acrylic resin.
  • the viscosity of the ink of the under layer is 20 to 35 seconds.
  • the viscosity is measured according to the ISO standard with section 3.
  • the installation 1, here rotating central drum 2 comprises a plurality of inking groups 4, 6, 8, 10 arranged in series at its periphery.
  • the whole is mounted on a frame 20.
  • the sheet to be printed F comes in this example from a mother reel. It is applied on the drum 2 and passes successively under the different inking groups. These each contribute for one part to the realization of the desired pattern. Drying means are also provided. At the output of the printing installation the sheet F is rewound or driven to other processing stations not shown.
  • the machine may comprise individual backpressure cylinders group by group.
  • a printing unit 30 in Figure 2. It comprises three cylinders.
  • a first cylinder 32 is immersed in a reservoir containing the ink. Instead of such a bubbler cylinder, it is possible to use a cylinder with doctor chambers.
  • the cylinder 32 rotating transfers this ink to an anilox cylinder 34 whose function is to dose the ink.
  • the cylinder 34 comprises cells calibrated on the surface. Their total volume as well as the speed of rotation determine the flow rate of ink transferred onto a plate carrier 36.
  • the plates are fixed on this cylinder. properly engraved to reproduce the pattern with the color assigned to the printing unit.
  • the drum 2 forms a counter-cylinder with a smooth surface and presses the sheet F against the plate mounted on the cylinder 36.
  • the printing qualities were first compared between a substrate consisting of a CWP sheet and a substrate consisting of a TAD sheet.
  • the same pattern was printed on a paper sample CWP of 21 g / m 2 and a sample of TAD paper of the same basis weight 21 g / m 2 .
  • the optical density D.O. was measured with a densitometer for three different dilutions of the ink 100%, 300% and 500%.
  • the substrate TAD because of its structure, offers a low optical density against a substrate manufactured using the CWP technique, regardless of the dilution.
  • the colors are less intense, the rendering is paler.
  • the color palette is therefore reduced.
  • the characteristics of the process are as follows. For the printing of the underlayer, we used a shot having a lineament of 60 lines / inch. The tests were carried out with three different anilox cylinders whose volumes were respectively 4, 10 and 16 cm 3 / m 2 for a linearization of 100 lines / cm. The cylinder pressure was set to a minimum.
  • the table below summarizes the results of tests performed on a TAD-type substrate printed with blue ink.
  • Three different dilutions of the ink were tested: 100%, 300% and 500%.
  • three tests were carried out, each with a sub-layer of different thickness, corresponding to the volume of the anilox, and one test without underlayer.
  • the ink of the underlayer was based on TiO 2 .
  • Annotation 0 in the "White Dilution" column means there is no underlay
  • Optical Density is found to increase with the amount of ink applied as an undercoat.
  • Optical Density is 20 to 50% higher
  • Tests were carried out with the same ink, on the same substrate, first without underlayer and then with an underlayer of TiO 2 , the anilox volume of which was 10 cm 3 / m 2 .
  • the tests consisted in printing a weft band, also called a range, having a line-of-line of 60 lines / inch, in order to precisely quantify the fattening of the screen points for covers of 3% to 10%.
  • Figure 3 shows a higher fattening for substrate S without underlayer. This deformation is due to the diffusion of the ink which is superior. Densitometer was measured a fattening greater than 5% to 20% for the substrate TAD.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Vascular Medicine (AREA)
  • Printing Methods (AREA)
  • Laminated Bodies (AREA)

Claims (8)

  1. Verfahren zum Flexobedrucken eines Zellstoffwatteblatts, das für eine Verwendung als Saugpapier ausgelegt ist, mit einem Flächengewicht zwischen 15 und 35 g/m2, insbesondere mit einer Dichte von weniger als 130 kg/m3, umfassend mindestens eine Druckgruppe mit einem Klischeeträger, mit dessen Hilfe man Druckfarbe auf das Blatt aufträgt, dadurch gekennzeichnet, dass man auf den zu bedruckenden Zonen zuvor eine Unterschicht aufträgt, die die Absorption der Druckfarbe durch das Zellstoffwatteblatt begrenzt.
  2. Verfahren nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass man als Unterschicht einen Lack aufträgt.
  3. Verfahren nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Lack auf Acrylharzbasis ist.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass man als Unterschicht eine Druckfarbe auf TiO2-Basis aufträgt.
  5. Verfahren nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass 40% bis 80% des Trockenextrakts der Druckfarbe, bei einem Trockenextrakt von etwa 60%, TiO2 ist.
  6. Verfahren nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, dass die Viskosität der Unterschicht-Druckfarbe, gemessen nach der Norm ISO mit dem Becher 3, 20 s bis 35 s beträgt.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Substrat ein Zellstoffwatteblatt mit einer Dichte von weniger als 130 kg/m3, insbesondere als 70 kg/m3, ist.
  8. Produkt aus Zellstoffwatte mit einem Flächengewicht zwischen 15 und 35 g/m2 und einer Dichte von weniger als 130 kg/m3 mit einem gedruckten Dekor, dadurch gekennzeichnet, dass es als Unterschicht der bedruckten Zonen eine Schicht entweder aus TiO2-Pigmenten oder aus Lack umfasst.
EP01403066A 2001-11-29 2001-11-29 Verfahren zum Flexodrucken von einem Zellstoffwatteblatt Expired - Lifetime EP1316432B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP01403066A EP1316432B1 (de) 2001-11-29 2001-11-29 Verfahren zum Flexodrucken von einem Zellstoffwatteblatt
DE60126294T DE60126294D1 (de) 2001-11-29 2001-11-29 Verfahren zum Flexodrucken von einem Zellstoffwatteblatt
AT01403066T ATE352426T1 (de) 2001-11-29 2001-11-29 Verfahren zum flexodrucken von einem zellstoffwatteblatt
PCT/FR2002/003742 WO2003045701A1 (fr) 2001-11-29 2002-10-30 Procede d'impression flexographique d'une feuille d'ouate de cellulose

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01403066A EP1316432B1 (de) 2001-11-29 2001-11-29 Verfahren zum Flexodrucken von einem Zellstoffwatteblatt

Publications (2)

Publication Number Publication Date
EP1316432A1 EP1316432A1 (de) 2003-06-04
EP1316432B1 true EP1316432B1 (de) 2007-01-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01403066A Expired - Lifetime EP1316432B1 (de) 2001-11-29 2001-11-29 Verfahren zum Flexodrucken von einem Zellstoffwatteblatt

Country Status (4)

Country Link
EP (1) EP1316432B1 (de)
AT (1) ATE352426T1 (de)
DE (1) DE60126294D1 (de)
WO (1) WO2003045701A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050045293A1 (en) * 2003-09-02 2005-03-03 Hermans Michael Alan Paper sheet having high absorbent capacity and delayed wet-out
US7189307B2 (en) 2003-09-02 2007-03-13 Kimberly-Clark Worldwide, Inc. Low odor binders curable at room temperature
US7297231B2 (en) 2004-07-15 2007-11-20 Kimberly-Clark Worldwide, Inc. Binders curable at room temperature with low blocking
CN105368231B (zh) * 2015-12-09 2017-11-10 杭华油墨股份有限公司 一种uv光油印前打底水性光油及其制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5209953A (en) * 1989-08-03 1993-05-11 Kimberly-Clark Corporation Overall printing of tissue webs
DE4300034A1 (de) * 1993-01-02 1994-07-07 Hobema Maschf Hermann Verfahren zum Bedrucken von endlosen Mehrfachbahnen aus Papier, Tissue, Nonwoven o. dgl., sowie Druckmaschine zur Durchführung des Verfahrens
JP3321596B2 (ja) * 1994-07-18 2002-09-03 凸版印刷株式会社 立体模様化粧紙及びその製造方法
US5735989A (en) * 1996-07-09 1998-04-07 Hampshire Holographic Manufacturing Corp. Process for transferring holographic images
JP4268261B2 (ja) * 1999-05-12 2009-05-27 大日本印刷株式会社 化粧材およびその製造方法

Also Published As

Publication number Publication date
EP1316432A1 (de) 2003-06-04
ATE352426T1 (de) 2007-02-15
WO2003045701A1 (fr) 2003-06-05
DE60126294D1 (de) 2007-03-15

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