US2761419A - Multiple coating apparatus - Google Patents

Multiple coating apparatus Download PDF

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Publication number
US2761419A
US2761419A US489969A US48996955A US2761419A US 2761419 A US2761419 A US 2761419A US 489969 A US489969 A US 489969A US 48996955 A US48996955 A US 48996955A US 2761419 A US2761419 A US 2761419A
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United States
Prior art keywords
web
coating
layers
slide
layer
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
US489969A
Other languages
English (en)
Inventor
Joseph A Mercier
William A Torpey
Theodore A Russell
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Priority to BE545464D priority Critical patent/BE545464A/xx
Priority to CA554506A priority patent/CA554506A/en
Priority to IT557307D priority patent/IT557307A/it
Priority to CA557259A priority patent/CA557259A/en
Priority to CA557260A priority patent/CA557260A/en
Priority to CA557258A priority patent/CA557258A/en
Priority to US489861A priority patent/US2761417A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US489862A priority patent/US2761418A/en
Priority to US489863A priority patent/US2761791A/en
Priority to US489969A priority patent/US2761419A/en
Priority to DEE11996A priority patent/DE1208998B/de
Priority to DEE11997A priority patent/DE1216686B/de
Priority to DEE11995A priority patent/DE1151173B/de
Priority to DEE11998A priority patent/DE1211488B/de
Priority to GB5590/56A priority patent/GB834525A/en
Priority to GB26305/59A priority patent/GB834527A/en
Priority to FR1148817D priority patent/FR1148817A/fr
Priority to GB26306/59A priority patent/GB834528A/en
Application granted granted Critical
Publication of US2761419A publication Critical patent/US2761419A/en
Priority to US769881A priority patent/US2975754A/en
Priority to DEE18311A priority patent/DE1177931B/de
Priority to FR808185A priority patent/FR1238160A/fr
Priority to GB36130/59A priority patent/GB901686A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05D1/34—Applying different liquids or other fluent materials simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B11/00—Treatment of selected parts of textile materials, e.g. partial dyeing
    • D06B11/0056—Treatment of selected parts of textile materials, e.g. partial dyeing of fabrics
    • D06B11/0069—Treatment of selected parts of textile materials, e.g. partial dyeing of fabrics by continuous contact with a member able to bring simultaneously a plurality of treating materials
    • 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
    • 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/0042—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by pouring or allowing to flow in a continuous stream onto the surface, the entire stream being carried away by the paper
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor

Definitions

  • the present invention relates to a new coating apparatus for applying multiple coatings to the surface of a moving web, and particularly to a coating apparatus useful in carrying out the method of multiple coating a web described in U. S. application Serial No. 489,863, filed on even date herewith.
  • the prhnary object of the present invention is to provide an apparatus by means of which this method of multiple coating 21 web can be carried out.
  • a further object is to provide a multiple hopper which forms each of several fluid coating compositions into individual layers and then brings them into surface contact prior to the time they are fed to a point of deposition where they are picked up on the surface of a moving web while the distinct layer relationship is maintained.
  • Another object is to provide a multiple slide hopper in which each of a plurality of separate coating compositions are individually formed into layers by individually pumping the compositions at a known rate onto separate downwardly inclined slide surfaces down which the compositions flow by gravity to form a uniform layer thereof, and arranging said slide surfaces so that layers formed on each one flow on top of one another and finally all flow in combined striated relationship from the last slide surface to a point of deposition where they are simultaneously picked up on the surface of a web moved continuously across said point of deposition.
  • Another object is to provide a coating apparatus of the type described wherein the end of the lowermost slide surface is slightly spaced from the surface of the web to be coated whereby a bead of coating is formed between the web surface and the lip of the last slide surface across and in contact with which the web moves to pick up the combined layers of coating compositions which are continuously flowing into said bead.
  • Still another object is to provide a multiple slide hopper of the type described wherein the individual slide surfaces are coplanar and are arranged one above the other.
  • Yet another object is to provide a multiple slide hopper of the type described wherein the individual slide surfaces are substantially parallel but not coplanar to facilitate movement of the successive layers of coating onto the top of one another.
  • Another object is to provide a multiple slide hopper of the type described which in effect comprises a single downwardly inclined slide surface which is broken up into a plurality of separate slide surfaces by means of elongated slots extending transversely thereof and spaced above one another along said surface and through which separate ribbons of coating compositions are fed out onto the slide surface.
  • Fig. l is a schematic showing of a coating apparatus including a multiple slide hopper constructed in accordance with the present invention
  • Fig. 2 is a side view, partly in section, showing a double slide hopper constructed in accordance with the present invention in combination with a web supporting device and Web to be double coated;
  • Fig. 2A is a sectional detail view showing another modification of the double slide hopper of Fig. 2;
  • Fig. 3 is a view similar to Fig. 2, but showing a fourslide hopper by means of which four layers of separate coating compositions can be applied to the surface of a web.
  • the present invention relates to a particular type of apparatus adapted for carrying out this new method of multiple coating.
  • this apparatus includes a multiple feed hopper which in this instance is a multiple slide hopper by the use of which the layers of the separate coating compositions are formed by allowing them to flow by gravity down an inclined slide surface for each coating composition, and all of the slide surfaces are arranged so that the layers formed thereon flow into stratified relation with one another as they move toward the coating point so that by the time they leave the last slide surface they are all combined in layer relationship and in this combined relation flow into a coating bead ma1ntained between the end of thelast slide surface and the web to be coated.
  • the web in moving across and in contact with this head of coating simultaneously picks up the combined layers of coating compositions on its surface and the layers of the separate coating compositions maintain their distinct layer relationship after deposition on the web surface.
  • a double slide hopper 1i having a cavity 11 into which one fluid coating composition S is continuously pumped at a given rate by a metering or constant discharge pump P through inlet 12.
  • the coating composition S is then forced from cavity it through a narrow vertical slot 13 in the form of a ribbon and out onto a downwardly inclined slide surface 14- down which it flows by gravity in the form of a layer i into a coating bead 17 formed between the surface of the web W to be coated and the lip or end of the slide surface.
  • the web W is backed up at this point by a roll 13 which may serve as a means of continuously moving the web across and in contact with the bead 17 as well as serving as a means for supporting and holding the web smooth while passing across the bead of coating.
  • This bead technique of coating is well known in the coating'art and is characterized by the formation of a puddle or head between the lips of the coating hopper and the surface to be coated which tends to pile up or puddle on that side of the coating device from which the web leaves.
  • This pile up or bead extends completely across the width of the web being coated and is generally referred to in the art as a coating bead or a head of coating.
  • Fig. 2 we have shown the form of bead believed to exist with the present double slide hopper, as well as the paths taken by the individual layers of coating composition in passing therethrough. However, it is pointed out that this is merely a speculation since it has proven practically impossible to actually see what occurs within thebead.
  • the coating is not in fact deposited directly onto the web surface by the hopper, but that the hopper merely maintains the coating bead and the web is coated therefrom.
  • the actual thickness of the coating laydown on a web moved thereacro ss will be determined by the action of the bead and will vary with the speed of web movement, etc. and will not necessarily be equal to, or directly dependent upon, the thickness of the ribbon of coating composition fed to the slide surface or the thickness of the layer formed in flowing down the slide surface.
  • the second fluid coating composition S is continuously pumped into a second cavity 19 at a given rate by a second metering or constant discharge pump P through inlet 20. From this cavity the composition is forced through a narrow vertical slot 21 in the form of a ribbon and out onto a downwardly inclined slide surface 22 down which it flows by gravity in the form of a layer 23. If slide surface 22 is coplanar with slide surface 1 5, as shown in Fig. 2, then layer 23 of coating composition S will flow up onto the top of the ribbon of coating composition S leaving slot 33 when it reaches this point and then the two layers and 23 of the separate coating compositions will flow down slide surface 14 in combined layer relationship without mixing.
  • the slide surface'22 may be raised above slide surface l4 by an amount substantially equal to the thickness of layer 23 so that layer 23 will flow onto the top of layer i5 without any, or with little, change in direction if such is desired.
  • the only requirement in this respect is that the two slide surfaces 14 and 22' be substantially parallel to one another and not be relatively offset by such an amount that the two layers would be brought together in such a way as to provoke a turbulent efiect which might cause the two to mix.
  • the layers of coating after application to the web have been designated by the same reference characters as the layers formed by moving down the slide surfaces 14 and 22 with the exception that the deposited layers have been designated by a prime to indicate that the thickness of the layers after deposition might be different than during the initial formation.
  • the hopper ll could be made from a single block of metal so that the slide surfaces 14 and 22 would in fact constitute a single slide surface broken into two separate slide surfaces by the vertical slot 13 entering transversely thereof, from a practical standpoint of milling out the cavities and slots, this is out of the question. Accordingly, we have shown the hopper made up of a plurality of individual blocks 253tl which are suitably machined so that when they are assembled as shown, the cavities, vertical slots and inlets will be formed. These individual blocks can be held in assembled relation by any suitable means not shown. With such a construction the slide surfaces 14 and 22 would be formed on blocks 25 and 27, respectively, and would be completely separate parts.
  • the hopper, or the blocks making up the same may be provided with interconnected conduits 31 through which a fluid heating or cooling medium may be circulated. If the vertical slots 13 and 21 are of the same width, then the relative thickness of the two layers of coating composition deposited on the web will depend upon the rate at which they are pumped into their re spective cavities 11 and 19.
  • a gelatino silver halide photographic emulsion and a protective coat of clear gelatin have been simultaneously coated onto a baryta-coated paper 42 inches wide at a speed of feet per minute to produce a commercial photographic paper having as. good physical and and photographic characteristics as the same product on which the two coatings were applied successively and with a complete drying of the emulsion coat prior to application of the protective gelatin coat.
  • a vacuum on the bead as disclosed in U. S. Patent 2,681,294 to eliminate excessive vibration and/or rupture of the bead.
  • this apparatus is not limited to the coating of narrowwidth sheets and the use of slow coating speeds, but is equally adapted for the multiple coating of commercial width product at high coating speeds. While there is no known limitation as to the thickness of coatings which can be applied by this hopper, it is particularly adapted for the application of thin layers, i. e. one micron to .025 inch in thickness.
  • the hopper may be provided with any suitable form of adjustable mount so that the position of the lower end of the lowermost slide surface relative to the web being coated may be adjusted for the best results.
  • the hopper 10 may be carried by a frame 32 provided with bearings 33 rotatably mounted on the axle of the roll 13 to swing concentrically of the roll so that the position of the hopper as a whole may be shifted around the roll periphery, see Fig. 1. It is adapted to be locked in any adjusted position by clamping screw 34 engaging an arcuate slot 35 in the support 36.
  • the hopper may be pivoted to the frame 32 for critical adjustment around the periphery of the roll, and may be slidably mounted on the frame for adjustment toward and from the roll periphery by any suitable means not shown.
  • the coatings applied may be of the type which are set by cooling prior to drying in order to limit the amount of relative flow between the layers themselves or between the bottom layer and the support.
  • the web W after being coated can be passed through a chill box 37 and then through a drying chamber 38. If the coatings applied are of the type which do not require chilling before drying, then chill box 37 can be omitted or by-passed.
  • the web may be pulled from the drying chamber 38 by a feed or guide roller 39.
  • hopper 50 is practically identical with the double hopper 10 shown in Fig.
  • the first fluid coating composition S is continuously pumped at a known rate into a cavity 51 through inlet 52 and from which it is extruded through a narrow vertical slot 53 in the form of a ribbon onto a downwardly inclined slide surface 54 over which it flows by gravity to form into a layer 55.
  • coating compositions are continuously pumped into cavities 56, 57 and 58 through inlets 59, 60 and 61, respectively, and are extruded in the form of ribbons from narrow vertical slots 62, 63 and 64, respectively, onto slide surfaces 65, 66, and 67, respectively, down which they flow by gravity to form separate layers 68, 69 and 79 of the different compositions.
  • Each coating composition is continuously fed into the hopper by a separate metering pump of the constant discharge type as shown.
  • the four slide surfaces are coplanar, or substantially so, so that as the layers of the separate coating compositions flow down their respective slide surfaces they are brought together in overlapping relation, and by the time the four layers reach the coating bead 17', they are combined in the desired stratified relationship.
  • the distinct layer relationship is maintained throughout the head so that as the web W .is moved across and in contact with the bead, it takes up on its surface the four layers of coating in the desired orientation and with the layers distinctly separate from one another and having a relative thickness commensurate with the rate at which each was pumped into the hopper. So far as we have been able to ascertain, there is no limit as to the number of separate layers of coating compositions which can be simultaneously laid down on the surface of a web with a multiple hopper of this type.
  • Reynolds showed that the critical velocity depended on the diameter of the pipe, the velocity of the fluids passing through the pipe, its density, and its viscosity, and that if these four factors were combined in one way, and one way only, a function known as the Reynolds number would be obtained giving the critical velocity for the flow of a fluid through a pipe.
  • the element of time might be the critical factor since the time elapsing between the deposition of the layers on the web and the time the coating is dried is relatively short and perhaps less than the time required for the coatings, or the materials dispersed therein, to diffuse into one another.
  • a multiple-layer slide hopper comprising aslide surface inclined downwardly toward the web guiding surface and terminating in a lip spaced from the guide surface by an amount slightly greater than the thickness of the web to be coated, a plurality of discharge slots extending from the interior of said hopper and opening onto said slide surface through which the separate coating compositions are adapted to be extruded in the form of layers, said discharge slots arranged so that the lowermost is spaced above said lip and the others are spaced from it and one another to provide uninterrupted slide portions below each slot down which the layer extruded from any slot flows by gravity to form a smooth layer of uniform thickness prior, in the case of all but the lowest slot, to the time it reaches the next lowest slot and flows onto the top of and along with the layer of coating composition extruded
  • a coating apparatus in which said slide surface of the hopper is composed of a plurality of individual slide surfaces separated by said discharge slots and positioned in adjacent relationship, the planes of all of said slide surfaces being substantially parallel to one another and each slide surface being spaced above the plane of the next lowest slide surface by an amount substantially equal to the layer of coating composition to be extruded from the latter so that the layer of coating composition sliding down the higher surface can flow onto the top of the layer of coating composition extruded from the next lower discharge slot with substantially no deformation of the uppermost layer.
  • a multiple-layer hopper for feeding a plurality of fluid coating compositions in superposed and distinct layer relationship to a point of deposition where they are simultaneously deposited onto the surface of a web moving relative thereto in such strata relationship, and comprising a block, a slide surface on said block inclined downwardly and terminating in a lip adjacent said point of deposition, a plurality of separate cavities within said block, one for each coating composition, a narrow discharge slot extending from each cavity to said slide surface through which a thin layer of coating composition is adapted to be extruded from each cavity and onto said slide surface, the lowermost of said discharge slots spaced from said lip and the remaining discharge slots spaced above this lowest slot and from each other to provide an uninterrupted slide portion below each slot over which the layer of coating composition extruded therefrom flows by gravity to form a smooth layer of uniform thickness before, in the case of all but the lowest slot, it reaches the next lowest discharge slot and flows onto the top of, and along with, the layer of coating composition extruded therefrom, and, in the case of the
  • a dual-layer hopper for feeding two fluid coating compositions in superposed and distinct layer relationship to a point of deposition where they are simultaneously deposited in such strata relationship onto the surface of a web moving relative thereto, and comprising a hopper provided with two separate cavities, a slide surface inclined downwardly toward said point of deposition and terminating in a lip adapted to be spaced from the surface of the web to be coated, a narrow discharge slot connecting each cavity with said slide surface through which a thin layer of coating composition is adapted to be extruded from each cavity and onto said slide surface, one of said slots opening into said slide surface at a point spaced from said lip whereby a slide portion is provided below said slot over which the layer of coating composition is adapted to flow by gravity to smooth out and obtain a uniform thickness, the second slot opening into said slide surface at a point above said other slot to provide a slide portion over which the layer of coating composition extruded therefrom may flow by gravity to smooth out and obtain a uniform thickness prior to flowing onto the top of the layer of coating composition extrude

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Textile Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
US489969A 1955-02-23 1955-02-23 Multiple coating apparatus Expired - Lifetime US2761419A (en)

Priority Applications (22)

Application Number Priority Date Filing Date Title
BE545464D BE545464A (it) 1955-02-23
CA554506A CA554506A (en) 1955-02-23 Simultaneous deposition of a plurality of fluid coating materials
IT557307D IT557307A (it) 1955-02-23
CA557259A CA557259A (en) 1955-02-23 Multiple layer hopper for multiply coating a web
CA557260A CA557260A (en) 1955-02-23 Multiple feed hopper for feeding a plurality of coating compositions
CA557258A CA557258A (en) 1955-02-23 Multilayer hopper for feeding a plurality of coating compositions
US489862A US2761418A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489863A US2761791A (en) 1955-02-23 1955-02-23 Method of multiple coating
US489969A US2761419A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489861A US2761417A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
DEE11996A DE1208998B (de) 1955-02-23 1956-02-22 Vorrichtung zum gleichzeitigen Auftragen mehrerer Schichten
DEE11995A DE1151173B (de) 1955-02-23 1956-02-22 Verfahren zum Beschichten eines Schicht-traegers fuer einen photographischen Film
DEE11998A DE1211488B (de) 1955-02-23 1956-02-22 Vorrichtung zum gleichzeitigen Auftragen mehrerer Schichten
DEE11997A DE1216686B (de) 1955-02-23 1956-02-22 Vorrichtung zum gleichzeitigen Auftragen mehrerer Schichten
GB26305/59A GB834527A (en) 1955-02-23 1956-02-23 Improvements in or relating to web coating apparatus
FR1148817D FR1148817A (fr) 1955-02-23 1956-02-23 Procédé et machine pour l'application simultanée de plusieurs couches sur un support et produit obtenu
GB5590/56A GB834525A (en) 1955-02-23 1956-02-23 Improved methods of making flexible material having a plurality of superposed layers
GB26306/59A GB834528A (en) 1955-02-23 1956-02-23 Improvements in or relating to web coating apparatus
US769881A US2975754A (en) 1955-02-23 1958-10-27 Multiple coating apparatus
DEE18311A DE1177931B (de) 1955-02-23 1959-09-30 Vorrichtung zum gleichzeitigen Auftragen mehrerer Schichten
FR808185A FR1238160A (fr) 1955-02-23 1959-10-22 Machine pour l'application simlutanée de plusieurs couches sur un support en bande continue
GB36130/59A GB901686A (en) 1955-02-23 1959-10-26 Improvements in or relating to web coating apparatus

Applications Claiming Priority (5)

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US489862A US2761418A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489969A US2761419A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489861A US2761417A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489863A US2761791A (en) 1955-02-23 1955-02-23 Method of multiple coating
US769881A US2975754A (en) 1955-02-23 1958-10-27 Multiple coating apparatus

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US2761419A true US2761419A (en) 1956-09-04

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US489969A Expired - Lifetime US2761419A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489862A Expired - Lifetime US2761418A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489863A Expired - Lifetime US2761791A (en) 1955-02-23 1955-02-23 Method of multiple coating
US489861A Expired - Lifetime US2761417A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US769881A Expired - Lifetime US2975754A (en) 1955-02-23 1958-10-27 Multiple coating apparatus

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US489862A Expired - Lifetime US2761418A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US489863A Expired - Lifetime US2761791A (en) 1955-02-23 1955-02-23 Method of multiple coating
US489861A Expired - Lifetime US2761417A (en) 1955-02-23 1955-02-23 Multiple coating apparatus
US769881A Expired - Lifetime US2975754A (en) 1955-02-23 1958-10-27 Multiple coating apparatus

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US (5) US2761419A (it)
BE (1) BE545464A (it)
CA (4) CA554506A (it)
DE (5) DE1208998B (it)
FR (2) FR1148817A (it)
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IT (1) IT557307A (it)

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Publication number Publication date
DE1151173B (de) 1963-07-04
DE1177931B (de) 1964-09-10
FR1238160A (fr) 1960-08-05
GB834525A (en) 1960-05-11
DE1211488B (de) 1966-02-24
GB834528A (en) 1960-05-11
CA554506A (en) 1958-03-18
DE1208998B (de) 1966-01-13
US2761791A (en) 1956-09-04
IT557307A (it) 1900-01-01
CA557260A (en) 1958-05-13
DE1216686B (de) 1966-05-12
US2975754A (en) 1961-03-21
GB901686A (en) 1962-07-25
CA557259A (en) 1958-05-13
CA557258A (en) 1958-05-13
GB834527A (en) 1960-05-11
BE545464A (it) 1900-01-01
US2761418A (en) 1956-09-04
US2761417A (en) 1956-09-04
FR1148817A (fr) 1957-12-16

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