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EP0221128A1 - Appareil et methode de revetement d'un substrat - Google Patents

Appareil et methode de revetement d'un substrat

Info

Publication number
EP0221128A1
EP0221128A1 EP19860902888 EP86902888A EP0221128A1 EP 0221128 A1 EP0221128 A1 EP 0221128A1 EP 19860902888 EP19860902888 EP 19860902888 EP 86902888 A EP86902888 A EP 86902888A EP 0221128 A1 EP0221128 A1 EP 0221128A1
Authority
EP
European Patent Office
Prior art keywords
substrate
roller
applicator roller
gas
coating
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Withdrawn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
EP19860902888
Other languages
German (de)
English (en)
Inventor
Ronald Edward Knight
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.)
Wallace Knight Ltd
Original Assignee
Wallace Knight Ltd
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 Wallace Knight Ltd filed Critical Wallace Knight Ltd
Publication of EP0221128A1 publication Critical patent/EP0221128A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets

Definitions

  • the present invention is concerned with an apparatus and a method for applying a coating material to a substrate.
  • the coating of substrates has generally been carried out by passing the substrate to be coated between an applicator roller and a pressure roller as for example shown in Figures 1 and 2.
  • the applicator roller 10 has a layer of the coating material 20 deposited on its surface. This can be done in a variety of ways, for instance by transferring a coating material from a coating tray 11 via a pick up and a transfer roller 12 and 13 respectively to the applicator roller.
  • the applicator roller and the pressure roller 14 rotate at identical peripheral speeds, and co-operate to drive the substrate 15 between them.
  • the applicator roller deposits a layer of the coating material onto the surface of the substrate 21 as the substrate passes between the rollers.
  • the applicator roller is generally provided with a rubber layer 16 to ensure both that a constant pressure can be maintained on the substrate to produce an even layer of the coating material, and that the substrate is driven smoothly through the machine.
  • the pressure roller comes into direct contact with the applicator roller and is therefore contaminated with the coating material.
  • This coating material has to be removed to prevent it contaminating the underside of the following substrate sheet. This is generally done by placing doctor blades 17 around the path of the surface of the pressure roller.
  • a drip tray 18 is also generally provided. However, this does not remove all the contamination, and so in the case of sensitive applications, a solvent bath is sometimes placed in the path of the surface of the pressure roller.
  • an apparatus for applying a coating material to a surface of a substrate comprising means for applying a layer of the coating material to the surface of a rotating applicator roller, means for moving the substrate past the roller, and means for pressing the substrate against the coated roller, wherein said pressing means consists solely of means for delivering a stream of gas against the substrate.
  • a method of applying a coating material to a surface of a substrate comprising the steps of: coating the surface of a rotating applicator roller with the coating material, moving the substrate past the coated roller, and pressing the substrate against the coated roller, wherein said pressing means consists solely of means for delivering a stream of gas against the substrate.
  • the present invention therefore provides a coating apparatus without the need for a pressure roller as used in the prior art. This is replaced by a stream of gas delivered onto a first surface of the substrate so as to force the second surface against the applicator roller.
  • the undersurface of the substrate is preferably supported so that its upper surface is out of contact, in the absence of the stream of gas, with the coated surface of the applicator roller.
  • coating material will not be deposited from the applicator roller onto the support.
  • the problem of the pressure roller being coated with coating material is overcome.
  • the coated surface of the applicator roller is engaged to slide over the surface of the substrate, which is found to prevent the two surfaces from sticking together.
  • the applicator roller can be driven at a speed such that its coated surface has a different speed, either faster or slower, than that at which the substrate is moved past it.
  • the applicator roller can be positioned at an angle relative to the direction in which the substrate is moved. This causes their respective surfaces to move in different directions where they contact one another, resulting in the two surfaces sliding across each other.
  • Figure 1 is a schematic sectional view of a prior art coating apparatus.
  • Figure 2 is a close-up sectional view of the prior art showing, in an exaggerated manner, the contact between the applicator roller and the pressure roller.
  • Figure 3 is a schematic sectional view of the coating apparatus of the present invention.
  • Figure 4 is a schematic plan view of one embodiment of the present invention.
  • Figures 1 and 2 illustrate a coating apparatus of the prior art. This comprises an applicator roller and a pressure roller between which the substrate is fed and consequently coated.
  • This apparatus has several disadvantages as outlined above.
  • FIG. 3 shows a schematic sectional view of a coating apparatus according to one embodiment of the present invention.
  • This provides an applicator roller 100 of circular cross-section rotatively mounted on driving means 102.
  • the applicator roller has a layer of coating material deposited on its surface via pick-up roller 106 and transfer roller 108.
  • the coating material 104 is conveniently picked up by the pick up roller from a tray of coating material 110.
  • the substrate 112 which is to be coated is mounted on vacuum conveyors 114 and passes beneath the applicator roller 100.
  • the vacuum conveyor is driven by vacuum rollers 116.
  • a feed roller 118 is conveniently located before the applicator roller to drive the substrate past the applicator roller.
  • a stream of gas illustrated by arrow A, is delivered against the underside of the substrate, forcing it against the roller.
  • the stream of gas is conveniently supplied from a plenum chamber 122 which is in turn connected to a pressurised gas source such as a fan or air pump 120.
  • the gas is then forced out of either a narrow slot or plurality of orifices 124 so as to be impinge on the undersurface of the substrate forcing its top surface against the roller 100, causing the coating material to be deposited on the moving substrate.
  • any suitable gas may be used, but for economic reasons, air is preferred.
  • the plenum chamber 122 has a top surface wall 126 which forms a support on which the substrate 112 moves during the coating step. This wall has down turned edges 127,128 to stop snagging of the substrate.
  • the distance between the wall 126 of the plenum chamber and the surface of the coating on the applicator roller is generally greater than the thickness of the uncoated substrate 112. This enables the applicator roller to slide over the substrate resulting in the sticking of the substrate to the applicator roller being greatly reduced.
  • the two surfaces can be caused to slide with respect to each other in two possible ways. Firstly, the applicator roller can be driven at a speed such that its coated surface has a different speed, either faster or slower than that of the substrate. Alternatively, the applicator roller can be positioned so that it is skewed with respect to the direction in which the substrate is moved, as shown in Figure 4. This causes their respective surfaces to move in different directions where they contact one another, resulting in the two surfaces sliding with respect to each other.
  • the surface of the applicator roller can have a speed such that the component of the sp-eed in the direction of the movement of the substrate is the same as the speed of the substrate itself.
  • the sliding action will be provided by the component of the motion of the surface of the applicator roller perpendicular to the direction of the movement of the substrate.
  • the stream of gas from the plenum chamber is conveniently delivered through the support wall 126 onto the undersurface of the substrate. Up until the present time, it has been necessary to provide a layer of rubber 16 on the outer surface of the applicator roller 10 so as to apply a pressure on the substrate 15 between the rollers 10 and 14 as shown in Figures 1 -and 2.
  • the present applicator roller may be made of a more durable material such as steel.
  • the applicator roller can be made of alternative suitable materials such as synthetic rubber.
  • analox rollers have been used for rollers 106 or 108.
  • Such a roller comprises a roller having a surface with a plurality of dimples in it. These rollers are capable of depositing a predetermined weight of coating material per unit area on a surface pressed against them.
  • the applicator roller may have grooves cut into it or be threaded. The use of such recesses allows a controlled amount of coating material to be deposited on the substrate, therefore giving an improved finish.
  • the applicator roller 100 is movable relative to the support 126, so that different thicknesses of substrate can be fed through the apparatus of the present invention.
  • the applicator roller and drive means, and/or the plenum chamber are preferably mounted for vertical movement.
  • Various coatings might be used in connection with the present invention, such as clear coatings. These can be used to produce a varnish or gloss finish on packaging for such articles as record sleeves, cosmetic containers, and book covers. It is also possible to use either pigmented or adhesive coatings to produce a coated substrate having a coloured or adhesive finish respectively.
  • Preferred substrates which may be used in connection with the apparatus .of the present invention are thin foils, plastics, laminates, paper and cardboard.

Landscapes

  • Coating Apparatus (AREA)

Abstract

Une couche de matériau de revêtement (104) est appliquée à un cylindre applicateur rotatif (100) qui dépose la couche sur un substrat (112), tel que des feuilles fines, des laminés, du papier ou du carton, se déplaçant sur son passage. Le substrat (112) est plaqué contre le cylindre rotatif (100) par un courant de gaz (A) dirigé contre la face inférieure du substrat (112).
EP19860902888 1985-05-13 1986-05-12 Appareil et methode de revetement d'un substrat Withdrawn EP0221128A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08512021A GB2174929A (en) 1985-05-13 1985-05-13 Coating sheets
GB8512021 1985-05-13

Publications (1)

Publication Number Publication Date
EP0221128A1 true EP0221128A1 (fr) 1987-05-13

Family

ID=10579042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860902888 Withdrawn EP0221128A1 (fr) 1985-05-13 1986-05-12 Appareil et methode de revetement d'un substrat

Country Status (4)

Country Link
EP (1) EP0221128A1 (fr)
AU (1) AU5868986A (fr)
GB (1) GB2174929A (fr)
WO (1) WO1986006655A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29808981U1 (de) 1998-05-18 1999-09-30 Eduard Küsters Maschinenfabrik GmbH & Co. KG, 47805 Krefeld Vorrichtung zum Auftragen eines Behandlungsmittels auf eine laufende Warenbahn

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB446558A (en) * 1935-07-16 1936-05-01 Frank Princenhoff Carlson Improvements in coating devices
DE891375C (de) * 1950-11-09 1953-09-28 Asea Ab Walzwerk zum Aufbringen von fluessigen Stoffen auf glatten Flaechen
GB926952A (en) * 1959-04-02 1963-05-22 Mason & Sons Ltd E N Improvements in and relating to apparatus for applying liquids to sheet material
US3647525A (en) * 1959-10-05 1972-03-07 Dahlgren Mfg Co Method and means for applying liquid to a moving web
US3455274A (en) * 1964-11-13 1969-07-15 Beloit Corp Sheet feeder
US3392701A (en) * 1966-04-07 1968-07-16 Du Pont Differential speed gravure coating apparatus
US3589331A (en) * 1969-04-04 1971-06-29 Westinghouse Electric Corp Apparatus for coating metallic foil
JPS4935438A (fr) * 1972-08-09 1974-04-02

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8606655A1 *

Also Published As

Publication number Publication date
AU5868986A (en) 1986-12-04
WO1986006655A1 (fr) 1986-11-20
GB8512021D0 (en) 1985-06-19
GB2174929A (en) 1986-11-19

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19870414

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Inventor name: KNIGHT, RONALD, EDWARD