EP1947241A1 - Procédé de brossage de rideau - Google Patents

Procédé de brossage de rideau Download PDF

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Publication number
EP1947241A1
EP1947241A1 EP08150249A EP08150249A EP1947241A1 EP 1947241 A1 EP1947241 A1 EP 1947241A1 EP 08150249 A EP08150249 A EP 08150249A EP 08150249 A EP08150249 A EP 08150249A EP 1947241 A1 EP1947241 A1 EP 1947241A1
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EP
European Patent Office
Prior art keywords
curtain
layer
coating medium
coating
primary
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Withdrawn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
EP08150249A
Other languages
German (de)
English (en)
Inventor
Tadashi Sasa
Akio Hirano
Hiroyuki Kohno
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 EP1947241A1 publication Critical patent/EP1947241A1/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters

Definitions

  • the invention relates to a Vorhangstreichbacter with a curtain coater and at least one curtain applicator head with or first several Be Anlagenungsmediums- layers are formed on an inclined surface of an oblique guide, wherein the respective layers superimposed on the inclined surface and as superimposed layers a multilayer Form coating medium curtain, which passes from the end of the inclined guide on the surface of the transported web.
  • General printing paper such as for catalogs and coated paper, which is used for, among others, pressure-sensitive paper, thermal paper, automatic barrier tickets, etc., is prepared by applying a coating liquid to the surface of the web, which is the base paper, by a coater ,
  • the coating medium curtains discharged from the curtain heads are placed close to each other and applied as a coating film with a thick film layer. This allows unevenness in the paint, such as speckles, to be prevented.
  • excess coating medium running down from the web surface can not be reused, even if it is collected because the coating media are mixed.
  • Fig. 11 represented (schematic side view, which includes a part of the cross section of the coating machine with multi-layered curtain) and from the Japanese Patent Laid-Open 1995-124510 is known, a coating machine proposed with multilayer curtain.
  • this known device of the spaced at a distance curtain heads Ch3, Ch4 the Coating media tc, td on a guide plate gs, which inclines towards the horizontal with the angle ⁇ ° down, respectively applied, and so the Be istungsmediums- curtains c3, c4 formed.
  • the coating media tc, td are superimposed on the guide sheet gs in a plurality of layers and are lowered in a plurality of layers from the end gs1 of the guide sheet to the surface of the web w moving in the arrow direction as a multilayer coating medium curtain c9.
  • several coating media or coating liquids are applied to the surface of the web w.
  • Fig. 12a and 12b are a projection in the area of the right end of the web w during the coating, seen from direction A in FIG Fig. 11 ,
  • Fig. 12a In the above-mentioned coating machine with multi-layered curtain, it sometimes comes to the appearance, as in Fig. 12a is shown.
  • the appearance is the following: In the coating film of the multi-layered coating medium curtain c91 falling on the surface of the web w, the coating medium curtain td1 of the coating liquid td applied to the upper layer is coated by the coating liquid curtain tc1 of the coating liquid tc facing the upper one Layer is pulled, whereby the liquid breaks (see hatching tc1 'in Fig. 12a ). There is also such a phenomenon, as in Fig. 12b is shown before.
  • the coating medium curtain td2 of the coating liquid td applied to the top layer is coated by the coating medium curtain tc2 of the coating liquid tc applied to the coating medium curtain lower layer is pulled, whereby the coating medium or the liquid breaks, which hatching td2 'in Fig. 12b is specified.
  • the present invention therefore has an object, in view of the above facts, to provide an improved curtain coating method in which the phenomenon of cracking of the coating medium film in a multi-layer coating medium curtain is prevented and a high-quality coating is performed. At the same time a collection of unmixed, excess coating medium should be possible.
  • a plurality of layers of the coating medium are formed on an inclined surface of an oblique guide, the respective superimposed layers being moved to the end of the o.g. directed obliquely guide down so that a multilayer coating medium curtain, which from the o.g. The end of the oblique guide aimed at the surface of the transported web is applied to the surface of the moving web.
  • multiple layers or the coating media each have a difference of not more than 10 mN / m at their surface tension.
  • the excess coating medium which has not been used for the application can be collected without mixing with another coating medium, since there is no cracking of the liquids in the multilayer coating medium curtain, so that further use of the collected medium is possible.
  • web w is intended in the examples of a paper or board web.
  • a layer ta is applied from the curtain head Ch1, initially in the form of a single curtain, to the guide sheet g below.
  • This single curtain is not in FIG. 1 visible, noticeable. In the example, however, it is wider than the width h of the web. He then forms on the guide plate g a line ta1. The respective stroke or primary layer ta1 is moved by the weight on the guide plate g directed to the lower end g1 of the guide plate.
  • a second coating medium is discharged from the curtain head ch2. This is done by first forming a coating medium curtain c2. This has a smaller width than the primary coating medium layer ta1.
  • the secondary layer tb1 reaches the guide surface g below the curtain heads ch1 and ch2 and the primary layer ta1 applied thereon.
  • the now superimposed two layers or lines ta1 and tb1 move by their weight on the guide plate g in the direction of the lower end g1 of the oblique guide.
  • This multilayer curtain c8 consists of the coating medium curtain ta2 resulting from the primary layer ta1 and the coating medium curtain tb2 resulting from the secondary layer tb1. In the vertical direction, these curtains are superimposed and result in a superimposed primary layer ta and a secondary layer tb on the surface of the web w.
  • the primary layer ta is the lower layer (base layer) and the secondary layer tb is the outer layer.
  • the excess primary layers ta9 which were not used for the coating are separated from the web w, i. directed outwards from its two web edges and collected and reused by a paint tray (not shown).
  • Fig. 2 is an enlarged view in the direction C, which shows the state of the multilayer coating medium curtain c8 in the right side of the end of the guide plate g1 of FIG Fig. 1 shown curtain coater 1 represents.
  • the viscosity of the primary coating medium layer ta1 (hereinafter referred to as the primary layer) and secondary coating medium layer tb1 (hereinafter referred to as the secondary layer) are set approximately equal, the difference in the surface tension of the primary layer ta1 and the surface tension of the secondary layer tb1 are large and small, and they show the state of the multi-layered coating medium curtain c8 for the primary layer ta1, a layer of 57% solid pigment, which distributes to the width h of the web w at a flow rate of 7 l / min and, as secondary layer tb1, a PVA (polyvinyl alcohol) containing Coating medium is used.
  • a PVA polyvinyl alcohol
  • the viscosity of the primary layer ta1 is for the Fig. 2a to 2c is set equal to 776 mpa (millipascal), and the viscosity of the secondary layer tb1 is for the Fig. 2a, 2c set equal with 804 mpa. In contrast, in Fig. 2b with 794 mpa the same viscosity is set approximately for both layers.
  • the surface tension of the primary layer ta1 is 33 mN / m (milli-Newton / meter) and the surface tension of the secondary layer tb1 is 43 mN / m, so that the surface tension of the secondary layer tb1 is set 10 mN / m greater than the surface tension of the primary layer ta1.
  • the primary coating medium curtain ta2 for the primary layer ta1 in the multilayer coating medium curtain c8 is drawn by the secondary coating medium curtain tb2 for the secondary layer tb1 whose surface tension is 10 mN / m, thereby forming a curtain ta2 ' the fluid is a little cracked.
  • the surface tension of the primary layer ta1 is 33 mN / m
  • that of the secondary layer tb1 is 28 mN / m
  • the surface tension of the primary layer ta1 is set to be 5 mN / m larger (ie the secondary layer is 5mN / m smaller) than the surface tension of the secondary layer tb1 ,
  • the secondary coating medium curtain tb2 of the secondary layer tb1 in the multilayer coating medium curtain c8 is drawn through the primary coating medium curtain ta2 of the primary layer ta1 whose surface tension is 5 N / m larger, thereby forming a curtain tb2 'in which the Fluid is also slightly cracked.
  • the surface tension of the primary layer ta1 is 33 mN / m
  • that of the secondary layer tb1 is 31 mN / m, so that the surface tension of the primary layer ta1 2 N / m is set larger than the surface tension of the secondary layer tb1.
  • Fig. 3 is an enlarged view in the direction C, which shows the state of the multilayer coating medium curtain c8 in the right side of the end of the guide plate g1 of FIG Fig. 1 shown curtain coater 1, and Fig. 4 shows from behind (web or paper surface back of Fig. 1 ) the multilayer coating liquid curtain c8 extending from the end of the guide plate g1 of FIG Fig. 1 Curtain coater 1 drops down.
  • Fig. 3 and 4 For example, high values were set for the viscosity of the primary layer ta1 and the secondary layer tb1, the differences in the surface tension of the primary layer ta1 and the surface tension of the secondary layer tb1 are set large and small, and they show the state of the multilayer Coating medium curtain c8 here.
  • a paint containing 57% solid pigment which is distributed at a flow rate of 7 l / min to the width h of the web, was used.
  • the viscosity of the primary layer ta1 is 764 mpa, that of the secondary layer tb1 is 890 mpa.
  • the surface tension of the primary layer ta1 is 32 mN / m and that of the secondary layer tb1 is 44 mN / m, so that the surface tension of the secondary layer tb1 is set to be 12 mN / m greater than the surface tension of the primary layer ta1.
  • the primary coating medium curtain ta2 of the primary layer ta1 is drawn through the secondary coating medium curtain tb2 of the secondary layer tb1 whose surface tension is 12 mN / m larger, thereby forming a curtain ta2 'in which the Liquid is largely torn.
  • the viscosity of the primary layer ta1 and the secondary layer tb1 are set equal to 890 mpa and, at the same time, the surface tension of the primary layer ta1 and the secondary layer tb1 are set equal to 32 mN / m.
  • Fig. 3b . 4b is shown that at approximately the same viscosity and surface tension set for the primary layer ta1 and Secondary layer tb1, the liquid does not crack in the multi-layer coating medium curtain c8, and Fig. 3a . 4a show that when the surface tension of the primary layer ta1 and the secondary layer tb1 differ by more than 10 mN / m, there is a marked cracking of the liquid in the multilayer coating medium curtain c8.
  • Figure 5 is a representation of the multilayer coating medium curtain c8 seen from behind (web or paper surface back in Fig. 1 ), which from the end of the guide plate g1 of in Fig. 1 shown curtain coater 1 falls down
  • Fig. 6 is an enlargement in the direction C, which the multilayer coating medium curtain c in the right side of the end guide plate g1 of in Fig. 1 shown curtain coater 1 shows.
  • . 6a becomes the primary coating medium curtain ta2 of the primary layer ta1 in the multilayered coating medium curtain c8 is drawn through the secondary coating medium curtain tb2 of the secondary layer tb1, whose surface tension is 13 mN / m greater, and thereby a curtain ta2 'is formed in which the liquid is largely cracked.
  • the surface tension of the primary layer ta1 is 32 mN / m, and that of the secondary layer tb1 is 31 mN / m, so that the surface tension of the primary layer ta1 is set larger by 1 mN / m than the surface tension of the secondary layer tb1, that is, they are set approximately equal ,
  • the difference in viscosity between the primary layer ta1 and the secondary layer tb1 has no relation to the cracking of the liquids in the multi-layered coating medium curtain c8. But there is a substantial rupture of the liquid when the difference between the surface tensions of the primary layer ta1 and the secondary layer tb1 is large.
  • Fig. 7a, b Fig. 12 are views in the direction D, which shows the multilayer coating liquid curtain c8 from the end of the guide plate g1 of FIG Fig. 1 show shown curtain coater 1
  • Fig. 7c is an enlarged view in the direction C, the multilayer coating medium curtain c8 in the region of the right side of the end of the guide plate g1 of Fig. 1 shown curtain coater 1 represents.
  • Fig. 7a b show the state of the multi-layer coating medium curtain c8 in which pigments are contained in the secondary layer tb1, and 7c in which a PVA layer for the secondary layer tb1 was used, and FIG Fig. 7a to c , the state at approximately equal set surface tension for the primary layer ta1 and surface tension for the secondary layer tb1 is shown.
  • the viscosity of the primary layer ta1 is set to 658 mpa
  • the viscosity of the secondary layer tb1 is set to a low value of 60 mpa.
  • the surface tension of the primary layer ta1 is 32 mN / m
  • that of the secondary layer tb1 is 31 mN / m, so that the surface tension of the primary layer ta1 is set larger than the surface tension of the secondary layer tb1 by 1 mN / m, that is, they are approximately equal set.
  • the viscosity of the primary layer ta1 is set to 960 mpa, and the viscosity of the secondary layer tb1 is also set to a high value of 690 mpa.
  • the surface tension of the primary layer ta1 is 32 mN / m, and that of the secondary layer tb1 is 31 mN / m, so that the surface tension of the primary layer ta1 is set larger than the surface tension of the secondary layer tb1 by 1 mN / m, that is, they are approximately equal set.
  • the viscosity of the primary layer ta1 is set to 776 mpa
  • the viscosity of the secondary layer tb1 is set to 804 mpa.
  • the surface tension of the primary layer ta1 is 33 mN / m
  • that of the secondary layer tb1 is 31 mN / m, so that the surface tension of the primary layer ta1 is set larger than the surface tension of the secondary layer tb1 by 2 mN / m, that is, they are approximately set equal.
  • the viscosities of the primary layer ta1 and the secondary layer tb1 are approximately equal.
  • the secondary layer tb1 is provided with pigments
  • Fig. 7c contains the secondary layer tb1 PVA, and it is in the Fig. 7b, c It has been shown that even if the kinds of the paint change so there is no cracking of the liquid when the surface tension of the primary layer ta1 and the surface tension of the secondary layer tb1 are the same.
  • Fig. 8 is an enlarged view in the direction C, which the multilayer coating medium curtain c8 in the region of the right side of the end of the guide plate g1 of Fig. 1 shown curtain coater 1 shows.
  • the viscosity of the primary layer ta1 is 500 mpa
  • the viscosity of the secondary layer tb1 is 440 mpa
  • the surface tension of the primary layer ta1 is 35 mN / m
  • that of the secondary layer tb1 is 28 mN / m, so that the surface tension of the primary layer ta1 is set to be 7 mN / m greater than the surface tension of the secondary layer tb1.
  • the secondary coating medium curtain tb2 of the secondary layer tb1 in the multilayer coating medium curtain c8 is pulled through the primary coating medium curtain ta2 of the primary layer ta1 whose surface tension is larger by 7 mN / m, and thereby creates a curtain tb2 ', where the liquid is slightly cracked.
  • the viscosity of the primary layer ta1 is 1120 mpa, and the viscosity of the secondary layer tb1 is 564 mpa.
  • the surface tension of the primary layer ta1 is 32 mN / m, and that of the secondary layer tb1 is 34 mN / m, so that the surface tension of the secondary layer tb1 is set larger by 2 mN / m than the surface tension of the primary layer ta1.
  • the primary coating medium curtain ta2 of the primary layer ta1 is drawn through the secondary coating medium curtain tb2 of the secondary layer tb1 whose surface tension is larger by 2 mN / m, thereby forming a curtain ta2 'in which the medium film is slightly cracked.
  • the viscosity of the primary layer ta1 and the secondary layer tb1 are set to the same value of 500 mpa, and both are set to the same value of 35 mN / m for the surface tension.
  • FIG. 8a Compared to the Fig. 8b, 8c is in Fig. 8a shown that for paintings of thermal paper, the more the surface layer tensions of the primary layer ta1 and the secondary layer tb1 are cracked, the more the liquid of the multi-layered coating medium curtain c8 cracks irrespective of the viscosity of the primary layer ta1 and the secondary layer tb1.
  • Fig. 9 is a view in the direction D, the multilayer coating medium curtain c8 from the end g1 of the guide plate of in Fig. 1 shown coating machine 1 shows.
  • Fig. 9 shows the state of the multi-layered coating medium curtain c8 at a high viscosity for the primary layer ta1 and the secondary layer tb1, using for the primary layer ta1 and the secondary layer tb1, in each case, paints with a 57% proportion of solid pigments having a flow rate of 7 l / min were applied to the width h of the web.
  • the viscosity of the primary layer ta1 is 764 mpa and that of the secondary layer tb1 is 890 mpa.
  • the surface tension of the primary layer ta1 is 32 mN / m and that of the secondary layer tb1 is 44 mN / m, so that the surface tension of the secondary layer tb1 is set to be 12 mN / m greater than the surface tension of the primary layer ta1.
  • the primary coating medium curtain ta2 of the primary layer ta1 is drawn through the secondary coating medium curtain tb2 of the secondary layer tb1 whose surface tension is 12 mN / m, thereby forming a curtain ta2 'in which the Liquid is much cracked.
  • the viscosity of the primary layer ta1 and the secondary layer tb1 are set to the same value of 890 mpa, and likewise, the same value of 32 mN / m for the surface tension is set for both.
  • Fig. 9 proves that if, at a high viscosity for the primary layer ta1 and the secondary layer tb1, the difference in surface tension for the primary layer ta1 and the secondary layer tb1 exceeds 10 mN / m, the liquid coating will break in the multilayer coating medium curtain c8 and that, on the other hand, with the same surface tension of the primary layer ta1 and the secondary layer tb1 and the same surface tension of the secondary layer tb, there is no cracking of the liquid.
  • Fig. 10 is a view in the direction D, the multilayer coating medium curtain c8 from the end g1 of the guide plate of in Fig. 1 shown coating machine 1 shows.
  • Fig. 10a, 10b show the state of the multi-layer coating medium curtain c8, with a same low viscosity of 60 mpa for the secondary layer tb1, and at the same high viscosity of 658 mpa for the primary layer ta1, wherein for the primary layer ta1 and the secondary layer tb1 each with a coating medium a 57% solid pigment was used, which was applied to the width h of the web at a flow rate of 7 l / min.
  • the surface tension of the primary layer ta1 is set to 32 mN / m, and the surface tension of the secondary layer tb1 to 45 mN / m, so that the surface tension of the secondary layer tb1 13 mN / m is greater than the surface tension of the primary layer ta1.
  • the primary coating medium curtain ta2 of the primary layer ta1 of the multi-layered coating medium curtain c8 is drawn through the secondary coating medium curtain tb2 of the secondary layer tb1 whose surface tension is 13 mN / m greater, thereby forming a curtain ta2 'where the liquid is essentially torn.
  • the surface tension of the primary layer ta1 is set to 32 mN / m
  • the surface tension of the secondary layer tb1 is set to 31 mN / m, so that approximately the same surface tensions are set.
  • Fig. 10 proves that when the viscosity difference for the primary layer ta1 and the secondary layer tb1 is large, there is no cracking of the liquid when the surface tensions for the primary layer ta1 and the secondary layer tb1 are approximately equal, but substantial tearing occurs Difference exceeds 10 mN / m.
  • the difference in the surface tension of the primary layer ta1 and the surface tension of the secondary layer tb1 is set to not more than 10 mN / m, and thus the coating of the primary layer ta1 and the secondary layer tb1 is carried out on the surface of the web w ,
  • the surface tension of the individual layers ta1, tb1 in the coater 1 is between 25 and 45 mN / m, and by setting the difference in the surface tension of the respective layers ta1, tb1 below 10 mN / m, tearing of the multiple coating medium curtain may occur 8c can be prevented.
  • the range of the concentration is provided in each case between 3 and 70%.
  • the viscosity can be selected arbitrarily in a range of 10 to 3000 mpa.
  • the coating medium film does not crack in the free fall in the multi-layered coating medium curtain 8c, whereby the coating liquid film is stable over the width, and uniform curtain coating across the width can be applied with high quality.
  • the secondary layer tb1 not with the excess primary layer ta9 (see Fig. 1 ), which falls downwardly from the web w, mixed, so that only the excess primary layer ta9 alone is collected in the ink tray and thus can continue to be used.

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
EP08150249A 2007-01-19 2008-01-15 Procédé de brossage de rideau Withdrawn EP1947241A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007010266A JP2008173577A (ja) 2007-01-19 2007-01-19 カーテンコータ

Publications (1)

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EP1947241A1 true EP1947241A1 (fr) 2008-07-23

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Application Number Title Priority Date Filing Date
EP08150249A Withdrawn EP1947241A1 (fr) 2007-01-19 2008-01-15 Procédé de brossage de rideau

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EP (1) EP1947241A1 (fr)
JP (1) JP2008173577A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190590A (zh) * 2014-08-18 2014-12-10 临安南洋装饰纸有限公司 浸胶打样机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07124510A (ja) 1993-11-05 1995-05-16 Dainippon Printing Co Ltd 同時多層塗工方法及びそれに使用する塗工装置
WO2004035931A1 (fr) * 2002-10-15 2004-04-29 Dow Global Technologies Inc. Processus de fabrication de papier couche ou de papier carton couche

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2858136B2 (ja) * 1989-09-05 1999-02-17 コニカ株式会社 塗布方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07124510A (ja) 1993-11-05 1995-05-16 Dainippon Printing Co Ltd 同時多層塗工方法及びそれに使用する塗工装置
WO2004035931A1 (fr) * 2002-10-15 2004-04-29 Dow Global Technologies Inc. Processus de fabrication de papier couche ou de papier carton couche

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190590A (zh) * 2014-08-18 2014-12-10 临安南洋装饰纸有限公司 浸胶打样机

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