EP1375014A2 - Procédé de revêtement avec un film fluide - Google Patents

Procédé de revêtement avec un film fluide Download PDF

Info

Publication number: EP1375014A2
Authority: EP; European Patent Office
Prior art keywords: coating; liquid; curtain; organic; surface tension
Prior art date: 2002-06-21
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.): Granted

Application number

EP03405398A

Other languages

German (de)

English (en)

Other versions

EP1375014A3 (fr

EP1375014B1 (fr

Inventor

Peter Schweizer

Ferdinand Krebs

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.)

Polytype Converting SA

Original Assignee

Polytype SA

Wifag Maschinenfabrik AG

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.)

2002-06-21

Filing date

2003-06-03

Publication date

2004-01-02

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=29716585&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1375014(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

2003-06-03 Application filed by Polytype SA, Wifag Maschinenfabrik AG filed Critical Polytype SA

2004-01-02 Publication of EP1375014A2 publication Critical patent/EP1375014A2/fr

2004-10-06 Publication of EP1375014A3 publication Critical patent/EP1375014A3/fr

2007-01-24 Application granted granted Critical

2007-01-24 Publication of EP1375014B1 publication Critical patent/EP1375014B1/fr

2023-06-03 Anticipated expiration legal-status Critical

Status Revoked legal-status Critical Current

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
- B05D1/305—Curtain coating
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/588—No curing step for the last layer
- B05D7/5883—No curing step for any layer
- B05D7/5885—No curing step for any layer all layers being applied simultaneously

Definitions

the invention relates to a liquid-film coating method for the on or multilayer coating of an article, in particular a web-like Substrate, such as a paper or board material, a plastic film, a metal foil or tape or web-like composite materials.
a web-like Substrate such as a paper or board material, a plastic film, a metal foil or tape or web-like composite materials.
coating object may also be a piece goods.
the liquid film coating process also known as curtain coating process
the liquid film coating process has been known for almost 100 years. In the beginning it became the one-layer coating of piece goods, such as chocolates or Furniture parts used, as described in DE 145 517 A. Since about 1960 the method is also used for the coating of endless belts, for example of Paperboard materials and aluminum foils used and, for example, by C.C. Poirier in "Curtain Coating of Corrugated Paper Board” TAPPI 49 (10): 66A-67A.
the first, technically advanced curtain process for the order of one or simultaneously several layers on a continuous substrate, especially for photographic Films and papers is described in U.S. Patent 3,508,947.
An example of the Coating for the production of magnetic recording materials is known from the US-PS 5,044,305, and the coating for producing a thermal Recording material or an ink jet recording material is disclosed in DE 100 33 056 A1.
the coating fluid or the several Coating fluids water based carrier liquids for each Coating material can be used.
the aqueous carrier liquids wetting agents added.
the wetting agents should be the Reduce the surface tension of the carrier liquid.
the invention relates to a liquid-film multilayer coating method in which a Curtain of at least one coating fluid on a transverse to the curtain poured subsidized object and thereby a fluid on the object Coating is formed.
the conveying direction of the object to be coated can normal to the curtain or also a deviating from the normal inclination respectively.
the fluid coating formed on the article then becomes solidified.
the coating fluid is based on an organic liquid or several organic liquids.
the organic liquid or more Organic liquids may or may be solidified by a chemical reaction and even a coating material or a part of a coating material or one or more volatile carrier liquids which itself is not part of the coating material.
Coating material in the context of the invention is referred to that material which after solidification, a coating or a single layer of a coating forms.
the coating material may for example consist of binders, pigments and Additives exist or may be another, serving a desired function Be material.
the coating fluid is therefore often a mixture of various substances, according to the invention at least one of these substances a organic liquid is.
This organic liquid can turn that Coating material or a part of the coating material form or a Carrier liquid for a coating material.
the mixture can be a solution or a dispersion, for example a suspension or emulsion.
organic liquids solidifiable by chemical reaction and organic carrier liquids are referred to as organic liquids.
organic carrier liquid is used only when the organic liquid in question is removed from the coating fluid after coating, for example by evaporation.
an organic liquid By using an organic liquid can be used in particular wetting agents are dispensed with when using water or aqueous Solutions serve as a carrier liquid of the lowering of the surface tension. Accordingly, the organic liquid is in a particularly preferred Embodiment of the invention wetting agents.
Organic liquids for example ketones, alcohols, esters, aliphatic and aromatic hydrocarbons and ethers, have the required according to the invention Surface tension from home on, so when using multiple Coating fluids have excellent uniformity of the layers in the film and on adjusts the object.
the uniformity is especially for thin Layer thickness satisfactory at low web speeds. Across from aqueous carrier liquids, this means a significant increase in the Operating window for the curtain coating process.
the organic carrier liquid can evaporate on heating Be carrier liquid, so that a single-layer coating or from the Coating fluid formed layer of a multilayer coating Heating is solidified, namely by removing the carrier.
the coating fluid may alternatively also be solidified by energy input, the Coating material immediately forming, organic liquid without volatile Be part or contain such an organic liquid, in particular a monomer or oligomer, ie a reactive organic liquid.
the organic liquid may be a polymerizable by heating Be liquid to the coating or just the relevant layer (s) Heating and polymerizing the organic liquid to be able to solidify.
the Organic liquid can advantageously also by irradiation, preferably by UV irradiation or electron irradiation, be polymerizable liquid, so that the single-layer coating or the layer formed from the coating fluid a multilayer coating polymerized by appropriate irradiation and can be solidified thereby.
the invention is particularly useful for forming multilayer coatings suitable. All or part of the multiple coatings can each be from a be formed other coating fluid. It can also be two or more of Layers are formed by the same coating fluid. Each of the organic Liquids which form or co-form the coating fluids are particularly preferred however, an organic liquid having a surface tension of at most 40 mN / m has. Each of the coating fluids is in other words according to the invention educated.
the plurality of coating fluids are preferably either only built up or containing organic carrier liquid or are only organic Liquids that are solidified by polymerization. In principle, however, can Also, both types of coating fluids have different layers in the same Form curtain.
the curtain coating coating fluids can not only with different Coating materials, but also with different organic liquids be formed.
the different organic liquids should however, at least approximately equal surface tensions. if the organic carrier liquids of the mixtures or the coating material or a part of the same immediately forming organic liquids different Have surface tensions, the differences should not exceed 5 mN / m and preferably not more than 2 mN / m. It is particularly preferred if all organic liquids have the same surface tension. The easiest is the requirement of the same or at least approximately the same Surface tension in mixtures by using the same organic Filling liquid.
Fig. 1 shows a coating apparatus for a liquid film coating means a multilayer curtain of coating fluids.
the coating device comprises a nozzle device 11 for the production of the Curtain of the plurality of coating fluids, in the embodiment of the four different coating fluids 1 to 4.
the following statements apply but also for curtains from less than four coating fluids, for example for a curtain of a single coating fluid. Likewise, they apply to Curtains with more than four different coating fluids.
Such a curtain can be formed with ten or more layers. Just as large, the number of be different coating fluids in the curtain.
the nozzle device 11 is a multilayer cascade nozzle, for example but also be formed by a multi-slot slot.
the Coating fluids 1 to 4 are supplied to the nozzle device 11 separately and in each case in one the consumption corresponding feed rate fed.
Such nozzle devices are known and therefore do not require a more detailed description.
the web 10 can For example, be a paper web, a plastic film or a metal foil.
the nozzle device 11 forms transverse to the material web 10 in parallel, in Conveying direction F successively arranged slots through which the coating fluids 1 to 4 emerge and after their exit on a side facing away from the material web 10 Top of the nozzle device 11 in the conveying direction F flow.
the slots in the conveying direction F one behind the other is on top of the Nozzle device 11 generates a multilayer liquid film.
the liquid film on the top of the nozzle device 11 already has the layer structure of the later Coating the web 10 on.
This multilayer liquid film flows the top of the nozzle device 11 in the conveying direction F of the material web 10 up to a front nozzle lip 15 of the nozzle device 11.
the fluid coating 6 formed on the material web 10 is subsequently solidified, for example by drying.
the coating device further comprises a below the nozzle device 11th arranged casting roll 12, around which the web 10 is deflected.
the curtain 5 impinges on the upper side of the material web 10 in a web area which is separated from the web Casting roller 12 expires, but is still supported by the casting roll 12.
a drip pan 13 At the Outside of the casting roll 12 upstream of the impact line of the curtain 5 on the Material web 10 is further a drip pan 13 with integrated suction device 14th arranged.
the drip pan 13 serves to fill and clean the Nozzle device 11 and for forming the liquid curtain.
the nozzle device 11 is horizontally in a parking position such shifted back that the detaching from the die lip 15 coating fluids fall into the directly underlying trough 13.
the casting roll 12 opposite wall of the tub 13 is also designed to that a narrow, precise and concentric gap between the trough 13 and the Giesswalze 12 and the casting rollers 12 wraparound web 10th forms.
the width of this gap must be small, preferably 0.5 mm, so that the Sump 13 achieved with its underside a squeegee effect with which a substantial Part of the entrained by the uncoated web 10 air boundary layer removed, i. is doctored off.
suction device 14 vacuum cleaner principle
the scraping and aspirating a substantial portion of the boundary layer air causes the Curtain method operated even at high speeds of the web 10 can be, without the remaining amount of boundary layer air along the wetting line of the impinging curtain 5 running transversely to the material web 10 between curtain 5 and web 10 is fed.
Each of the coating fluids 1 to 4 is or contains an organic liquid called as at the same time forms the coating material or a part of it, or one Mixture of a coating material and an organic carrier liquid, the in the case of a solution of the coating material in the carrier liquid also as Solvent can be designated. All coating fluids 1 to 4, if they Are mixtures, dispersions, for example emulsions or suspensions, or solutions. Also mixed forms, where one or more of the Coating fluids 1 to 4 a solution and another or more of the other Coating fluids 1 to 4 are a dispersion are possible. It can also be a or more of the layers one mixture and one or more other ones Layers a the coating material or a part thereof forming organic Be liquid.
a liquid curtain for example the curtain 5
a liquid curtain is called stable if it is used for long periods of operation, ie for several hours, can not be torn open by constantly present disturbing influences.
Such a curtain is also referred to as suitable for production, that is he can for the industrial Coating be used.
the invention has recognized that a low surface tension of at most 40 mN / m of the liquids used is conducive to curtain stability, namely especially when dynamic processes are reduced or ideally completely can be avoided.
Such dynamic processes are flow processes and Diffusion processes within the fluid layers and between the fluid layers of the Curtain.
Such dynamic processes are inventively practical Insignificance thereby reduces the liquid in the case of a single-layered Curtain of organic nature and in the case of a multi-layered curtain the Majority or, most preferably, all liquids are organic in nature. If the different coating materials of a multilayer coating it For mixtures with just one other coating material, it should only be allowed a single organic liquid for such different coating fluids of the Curtain can be used to obtain surface tension identity.
Fig. 2 shows the relationship depending on the age of the free liquid surface, the characteristic time of the diffusion process and the wetting agent concentration. It is known that the characteristic time of the diffusion process depends on the type of wetting agent used, that is to say on its molecular structure, and on the wetting agent concentration. The characteristic time can take up to several seconds. With sufficiently long diffusion time, the equilibrium surface tension, that is, the static surface tension, is achieved. Until the static surface tension is reached, aqueous solutions mixed with wetting agents therefore have a changing surface tension. It can be seen in particular from FIG.
a low surface tension of 40 mN / m and preferably less with a low surface age of the aqueous solution in question can only be achieved if large amounts of a fast-diffusing wetting agent are added.
adding wetting agents may improve curtain stability, it is problematic or even banned in many potential applications.
packaging materials such as food or drug wetting agents are undesirable or are not allowed by the relevant regulatory authorities, such as the FDA in the US, when the surfactant molecules come into contact with the product to be packaged and there is a risk that the product properties by on the Filling material passing wetting agent molecules could be changed.
wetting agents can also be problematic because they can adversely affect wetting and bleeding of the ink on the material to be printed.
the invention provides a remedy, especially when it is completely dispensed with the use of wetting agents, for which the invention just creates the best conditions.
the invention thus opens up new fields of application for the curtain coating processes which are particularly suitable for mass production, namely in particular those mentioned above.
the characteristic Diffusion time can be compared with the characteristic fall time of the curtain.
the initial velocity V 0 can generally be neglected, since its dependence on the type of nozzle is usually low and the initial velocity is usually much smaller than the gravitational term in equation (1).
Fig. 3 a typical example of the dependence of the curtain fall time on the drop height x shown.
the Curtain drop time therefore between 50 and 200 ms. This is a very short time ago all compared to the diffusion time, which is required to in aqueous solutions the meaningful due to the short surface age in the curtain Surface tension of at most 40 mN / m and preferably less to produce.
the curtain coating process belongs to the class of so-called pre-metered coating processes, in which only just the exact amount of coating fluid is pumped to the nozzle device. In contrast to other coating methods, such as roller, knife or air knife method, the curtain method is operated without excess liquid.
the invention has recognized that not only the lowest layer of a multilayer curtain should have a low surface tension, as in DE 100 33 056 A1 is required.
the effect of a rapidly adjusting low surface tension on the curtain stability is due to the ability to local Cross flows, so-called Marangoni currents, on the curtain surface too avoid being affected by local surface voltage differences as a result of interference be generated.
a liquid curtain has two outer surfaces, on which can attack disturbances.
the layers between the outermost layers Ability to rapidly reduce their surface tension to these levels the curtain stability is guaranteed even if the outer layers of the Disturbances can not resist.
a multi-layered curtain is so special then industrially robust or stable, if all layers of the curtain one According to the invention have low surface tension of at most 40 mN / m. Preferably, the surface tensions of all layers are even lower.
the origin of the front outer curtain surface is at Slot exit of the uppermost layer 1 on the inclined plane of the cascade nozzle 11. Je according to the number of layers, this location can be far away from the nozzle lip 15. at For example, the formation of three fluid layers is the distance from Slot exit to the nozzle lip 15 about 150 mm.
the age of the free Film surface at the location of the nozzle lip 15, that is, at the location where the curtain 5 is determined by the flow rate of the multilayer fluid film on the determined inclined plane. The flow rate depends on the viscosities of the Coating fluids, their densities and volumetric flows and from the angle of inclination.
the front curtain surface at Curtain start that is, at the nozzle lip 15, therefore a deep surface tension. If the flow time of the fluid film on the nozzle surface is long enough, the Surface tension even the equilibrium value, which is the static Surface tension corresponds. Below the nozzle lip 15, the front outer Curtain surface stretched due to the gravitational acceleration, that is, it arises there a new liquid surface, the immediately after their emergence less Contains wetting agent molecules, so that the local surface tension first again increases before they due to wetting and adsorption Fall time decreases again.
Fig. 4 shows this relationship and shows beyond also the course of the surface tension as a function of the surface age for the rear outer curtain surface.
the disadvantages described above are avoided by that the curtain coating process is carried out with liquids based on organic substances, that is with organic liquids.
Many of these Liquids have an inherently deep surface tension of less than 40 mN / m.
Carrier liquids, in particular solvents have a surface tension in the Range of 15 to 35 mN / m as preferred for the purposes of the invention.
the problem of dynamic surface tension is eliminated in organic Liquids, because the surface tension is not due to dynamic effects such as Diffusion and adsorption must be lowered.
Suitable organic carrier liquids are both low-boiling and high-boiling Liquids, as long as only the surface tension does not reach the value of 40 mN / m exceeds.
Suitable carrier liquids are, in particular, ketones, for example Acetone, butanone and cyclohexanone, furthermore alcohols such as ethanol, Butanol and cyclohexanol, further esters such as ethyl acetate, also butyl acetate and finally aliphatic and aromatic hydrocarbons such as Low-boiling point benzine and toluene.
ethers such as tetrahydrofuran or even those with other or more functional groups such as chlorobenzene or 2-methoxy-1-propyl acetate.
Carrier liquids are useful in the context of the invention and are among the Concept of carrier liquid subsumed.

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Application Of Or Painting With Fluid Materials (AREA)
Coating Apparatus (AREA)

EP03405398A 2002-06-21 2003-06-03 Procédé de revêtement avec un film fluide Revoked EP1375014B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE10227789A DE10227789B4 (de)	2002-06-21	2002-06-21	Flüssigfilm-Beschichtungsverfahren
DE10227789		2002-06-21

Publications (3)

Publication Number	Publication Date
EP1375014A2 true EP1375014A2 (fr)	2004-01-02
EP1375014A3 EP1375014A3 (fr)	2004-10-06
EP1375014B1 EP1375014B1 (fr)	2007-01-24

Family

ID=29716585

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP03405398A Revoked EP1375014B1 (fr)	2002-06-21	2003-06-03	Procédé de revêtement avec un film fluide

Country Status (6)

Country	Link
US (1)	US20030235657A1 (fr)
EP (1)	EP1375014B1 (fr)
JP (1)	JP2004025179A (fr)
AT (1)	ATE352382T1 (fr)
DE (2)	DE10227789B4 (fr)
ES (1)	ES2280719T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102009050898A1 (de)	2009-10-27	2011-04-28	Alcan Technology & Management Ltd.	Käseproduktverpackung, verpacktes Käseprodukt, Verwendung sowie Verfahren zum Herstellen einer Käseproduktverpackung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1249533A1 (fr) *	2001-04-14	2002-10-16	The Dow Chemical Company	Procédé de fabrication de papier ou carton enduit muticouche
US7473333B2 (en) *	2002-04-12	2009-01-06	Dow Global Technologies Inc.	Process for making coated paper or paperboard
US7364774B2 (en)	2002-04-12	2008-04-29	Dow Global Technologies Inc.	Method of producing a multilayer coated substrate having improved barrier properties
PT1712299E (pt) *	2003-12-30	2009-09-02	Sarriopapel Y Celulosa S A	Método de produzir papel metalizado através de revestimento por cortina
AU2005285221B2 (en) *	2004-09-09	2010-11-11	Avery Dennison Corporation	Curtain coating method
JP2006320785A (ja) *	2005-05-17	2006-11-30	Nippon Steel Corp	多層被覆金属板の製造方法

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US3443983A (en) *	1966-10-28	1969-05-13	Robertson Co H H	Film forming composition and protected metal articles utilizing the same
US3508947A (en) *	1968-06-03	1970-04-28	Eastman Kodak Co	Method for simultaneously applying a plurality of coated layers by forming a stable multilayer free-falling vertical curtain
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2002
- 2002-06-21 DE DE10227789A patent/DE10227789B4/de not_active Expired - Fee Related
2003
- 2003-06-03 EP EP03405398A patent/EP1375014B1/fr not_active Revoked
- 2003-06-03 AT AT03405398T patent/ATE352382T1/de not_active IP Right Cessation
- 2003-06-03 DE DE50306351T patent/DE50306351D1/de not_active Revoked
- 2003-06-03 ES ES03405398T patent/ES2280719T3/es not_active Expired - Lifetime
- 2003-06-19 US US10/465,907 patent/US20030235657A1/en not_active Abandoned
- 2003-06-20 JP JP2003176283A patent/JP2004025179A/ja active Pending

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102009050898A1 (de)	2009-10-27	2011-04-28	Alcan Technology & Management Ltd.	Käseproduktverpackung, verpacktes Käseprodukt, Verwendung sowie Verfahren zum Herstellen einer Käseproduktverpackung
WO2011054452A1 (fr)	2009-10-27	2011-05-12	Amcor Flexibles Kreuzlingen Ltd.	Emballage de produit fromager, produit fromager emballé, utilisation et procédé de fabrication d'un emballage de produit fromager

Also Published As

Publication number	Publication date
DE10227789A1 (de)	2004-01-22
EP1375014A3 (fr)	2004-10-06
JP2004025179A (ja)	2004-01-29
EP1375014B1 (fr)	2007-01-24
ATE352382T1 (de)	2007-02-15
DE10227789B4 (de)	2009-01-08
ES2280719T3 (es)	2007-09-16
US20030235657A1 (en)	2003-12-25
DE50306351D1 (de)	2007-03-15

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