DE1621909A1 - Method of applying a coating liquid to the surface of a continuously moving web - Google Patents

Description

DR. E. WIEGAND DIPL-ING. W. NIEMANN DR. M. KÖHLER DIPL-ING. C GERNHARDT

MONKS HAMBUKG

TELEPHONE: 55547 «eOOOMONCHENIS, 30 June 19Ö7

TBLEGRAMMEt CARPATENT. NUSSBAUMSTRASSE 10

;. '. 13 208/67 13 / never

Fuji Shashin Film Kabushilci Kaisha Kanagawa. (Japan)

^A method for ufbringen a coating liquid on the surface of a moving web sich.kontinuierlich

The invention relates to a method of applying a liquid to a moving orbital carrier. In particular, the invention relates to a transfer process for the production of photographic photosensitive materials (covering a halogen syllable) , Lichthofschütziösurig (antihalation back solution),: ^ ilterübe ^ ztigslösimg o. The like: ..), of raagnetischen Aufzeiehriungsstreifen, Barytpapiereiv coated * · new papers ο «'cdgl., Whereby the process, on such Fg ^ Ie; ^: How über'ziehen at hoherr ^ ssfehwiiidigkeiteri, accurate _coating:

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forming a thin layer. and coating one Dispersion, which carries easily separable pesticide particles under - · separation, can be adjusted.

"Previous attempts to coat at high speeds or to coat precisely with the formation of thin layers by means of roller application or coating have been unsatisfactory, mainly for the reason that the coating is fluid ^: -

to the

sigkeit is at / buckling or Abklemmten in which the coating roller is connected to a to be coated carrier into contact HP "unstable, wherein the coating surface is not smooth;. \, or ⁿ Ieke unevenly .v / IRCU ^w s is therefore difficult , ... "■." ■ .. a; suitable transfer liquid / 'a suitable coating

Torriöhtüng; and select suitable coating conditions. ; In particular. must: sufficient attention should be paid to the material, the adjustment and maintenance of the metering roller and the nature of the process. When a coating liquid is applied in which easily settable solid particles are dispersed, settle. the pesticide particles on the bottom of the container, v / o - '".- ä _v . is caused by a non-equivalency of the coating liquid, and' the resulting precipitate produces when applied to a carrier: longitudinal streaks or an original uniformity on it, .." . "-;. whereby the quality of the coating deteriorates. iQemgemäij the mass container must be exchanged or washed during the coating in order to overcome these disadvantages.

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The main object of the invention is therefore to create
a coating method which is adapted and applicable to such cases as coating at high speeds, precise coating to form a thin layer, and coating of a particulate-carrying dispersion which can easily be deposited, taking the above-mentioned matters into consideration.

Z-Sin. A special feature of the coating method according to the invention consists in the supply of a coating liquid in a greater length than the narrow one which is to be worn on the "web in the direction opposite to the moving web" so that the coated liquid against the outer surface of the web: Bt and ir ·, the subsequent removal of the surplus coating liquid through
Suction at a point where the fluid pressure is reduced .

The invention is explained below with reference to the drawing

explained in more detail, the in schematic representation'eine Vorrich- ^ tion shows that in the practical implementation of the coating process according to the invention can be used.

A web-like carrier 1 is driven by a rotating roller 2
and is moved in the direction of the pull-over arrow
coated by means of the coating device 3. A coating liquid corresponding to the amount to be applied is drawn from a transfer liquid container k via a regulating valve

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by suction from a metering pump 5 (compressed, metering pump) together with a "Ualauf led liquid supplied by a circulation fluid.sver.it 11 16": »- The amount of liquid delivered by the metering pump 5 is the sum of the amount of liquid on the web as a coating, the coating liquid to be applied, and the coating liquid to be removed: and dear- in circulation haifeerien FlS die. sxilt he G, in soft "the impurity timings are removed, are *, d-ureiige & ende ütoraiagsf Erssigkelt arrives in the dile transferring cable & iiag 3 at: liquid admission J _a The excess liquids in the coating

rag-. j flows out of the Schiits 8, the one to. an upper lip or an upper projection of a yoke wall j and an inner core .10 the coating represents a gap formed by a tang, the flow of liquid emerging at a speed opposite to the direction of movement of the carrier 1 so that that he is on

. , -. is ■■■; '■'. '■. ■
this directed / and strongly pushes against the carrier in the event of a collision contact part H. Part of the coating liquid thus colliding is passed through a gap or gap between the carrier and the end of the upper lip part and applied to the carrier as a coating film, while the remaining part of it even after vigorously colliding at the collision contacting parts

BATH ORIGINAL

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1821309

In the opposite direction to the .bewegiii ^ si'ic ^ tutQg .des Tragers imdin 'contact with it-through the-responsibility gt; we-εΐ »-Dana, becomes the oversized one

the to. a suction effect 14, wiriij which represents a gap _{formed zxiisehen a lower part 13 and:} the interior of the covering unit, sucked therein, since this gap or this gap is formed wider than the gap of the slot 8, and the narrow one the coating liquid-is determined by the previously coated ..quantity /. decreased so: that the pressure of the coating liquid on the. Suction opening is lower than that of the coating liquid at the nozzle., This serves to reduce a pond or swamp formed from the coating liquid between the upper lip part and the carrier and to thinner. Coating thickness. ■

The coating liquid sucked into the suction part 14 leaves the coating device at the liquid discharge opening 18 and is again collected by the metering pump 5 through a circulating fluid valve 16. with. of passing through that coating liquid regulator valve VJ ness Liquid aspirated. ■ _ "., -.

In detail, the .Flüssigkeitsüberzugseinrichtung 3 is preferably formed so that the gap of the liquid slit 3 gergelt independently or autonomously .. is, by holding the end of the upper Eppenteils $ ,, variable. The position

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The purpose of the end of the upper lip part 9 is, to a significant extent, to provide stability for a filling part on the other part of the cycle between the carrier r / xtia egg> be: · - draw roller and the regulation of the. Uberzupjadiek to be raised ¹ ).

Furthermore, with such a structure or ilechanic, it is desirable that the distance between a carrier to be coated and the liquid coating element can be regulated in a straightforward manner. V / hen the - 10 inner core of überzugseinrlchtung from a circulation or Dreriwalzej as shown in the drawing, which Gesehwindii ^ Bitsverteilung can to be dispensed coating liquid can be easily regulated ¹ and the cleaning of the inner parts of the coating device is easy, although this gerriäß the present Invention is not absolutely necessary ο The inner core can also be arranged in a fixed position or have a different shape than a roller. In the case of a fold, an empty space or clearance 15 is preferably provided in order to obtain good turning or revolving of the folds. The selection of a suitable rotational speed of the inner core roller as a function of the speed distribution of a flow of liquid which is to be dispensed can serve to regulate the angle of collision between the coating liquid and the carrier. In some cases the core roll can be used in the reverse direction (opposite to the arrow). Furthermore, the core roll must be immersed in a coating liquid

BATH ORIGINAL

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162-308

"Are ends of v'a.lse liquid sealed> without d ^ e -bersugijilv-LIQUID" nit a de rar tigeri Syst .EM be equipped AEAS both influence "au," - "is.. ilu ^ er der · ν anste bi; sc3i.v'j flat rotating roller, the .inner core can also consist of .einer:. in 'de, ¹ : ildän; "a side wall- a liquid nozzle bsWo.-

? Mel 3etr * ^i: 3 -> - such a "V" orrfchtun can r- "the tunnel Jen advantages are obtained: Sin over ieiien ^ at r>Iien" ^ £ ^{*;? /.'-:} ndigkeiteii unte '' _ stable conditions err.ioglioht -.:irä ...: .. ii \ * ^accurate: öersieheh, to form a thin. Layer K?: Ra da ;;; it without further ado, enables: what up to 3U this-i 2'eitpuiViiv was regarded as very difficult to cover a. -Dispersion, the solid particles, - which can easily more stable "/ can be carried out during a long period with an equally effective and good quality of the coating" and without the formation of longitudinal striations and unevenness, whereby these advantages considerably improve the production performance. " In addition, various disturbances or difficulties in coating, for example due to dust materials adhering to the carrier, can be reduced to a minimum. ^

The transfer device of the above described Type can be used for a wider range of properties, excess liquid, coating speed and

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Coating thickness with no need for any mechanical Precision compared to other coating systems such as roll coating and ejection coating can be applied.

The invention is illustrated below by way of examples explained in more detail »

Example 1 ". '■'. '.'

A gelatin halide silver emulsion having a viscosity of 50 cp was on a film base made of cellulose triacetate, the previously undercoated or with an intermediate coat had been provided ^ at a coating speed of 50 m / min applied using the device shown in the drawing, being a smooth and uniform Thick coating of 10 ml / m was obtained, "The Resulting Photographic" film gave on exposure to photographic Treatments have similar properties as those-one ordinary "ilms.

- Example 2 ^

Solution of a high molecular weight material for the formation of an agnetic film with a content of magnetic iron oxide with a viscosity of. 3500 cp: was applied to a ilmunterläge from cellulose triacetate at a coating speed of 30 ro / roin using the - applied in the drawing coating device shown, wherein a smooth and uniformly thick coating of 50 "ml / m was obtained ,, ^=?

BAD ORiGSNAL ^r "; ^{: i} 109834 / 12Λ9

Claims (2)

■ - 9 - Claims 1, a method for applying a coating liquid 'to the - "-' surface of a continuously moving web, characterized in that the coating liquid is applied in a larger amount than the amount to be carried by the web in the opposite direction to the direction of movement of the The web is applied in such a way that the coating liquid collides against the surface of the web, and then the excess coating liquid is removed by suction at a point at which the ¹ VuCk of the coating liquid is reduced. .'- '■ "" ■ -. '■' ■: "'-.-' ■: ' 2. 'Method according to claim 1, characterized in that the coating liquid in a _bigger: Quantity than die.von the web to supporting amount domestic "opposite fiiehtung to the running direction of the web through-a between a in a cavity of a coating device arranged rotating or revolving roller and a ... before the wall of the coating device formed ^q slit so that the coating liquid collides against the surface of the web, and. then the excess coating liquid.-is reduced by suction at a .. ^a share in softer ⁼ the pressure of the coating liquid is removed. ".. '" _--: i ORIGINAL BATHROOM 109834/1249 La er se it-e