New! View global litigation for patent families

WO2002020180A1 - Method and machine for applying a thick layer of varnish to facing sheets in roll form - Google Patents

Method and machine for applying a thick layer of varnish to facing sheets in roll form

Info

Publication number
WO2002020180A1
WO2002020180A1 PCT/EP2001/009958 EP0109958W WO2002020180A1 WO 2002020180 A1 WO2002020180 A1 WO 2002020180A1 EP 0109958 W EP0109958 W EP 0109958W WO 2002020180 A1 WO2002020180 A1 WO 2002020180A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
varnish
sheet
head
machine
extrusion
Prior art date
Application number
PCT/EP2001/009958
Other languages
French (fr)
Inventor
Max Canti
Original Assignee
Canti & Figli S.R.L.
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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02Apparatus 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
    • B05C5/0254Coating heads with slot-shaped outlet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/26Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265Extrusion coatings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00Sheets
    • B05D2252/02Sheets of indefinite length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065After-treatment
    • B05D3/067Curing or cross-linking the coating

Abstract

A method and a machine for applying a thick layer of varnish to sheets used for facing in roll form, comprising the steps of: depositing a lamina of varnisch onto a sheet (2) which unwinds from a roll (1); and cross-linking the lamina to dry the lamina of varnish.

Description

METHOD AND MACHINE FOR APPLYING A THICK LAYER OF VARNISH TO FACING SHEETS IN ROLL FORM Technical field

The present invention relates to a method for applying to thin sheets used for the facing of panels a layer of varnishing or paint whose thickness allows subsequent sandpapering, in order to eliminate any imperfections and to achieve a higher degree of protection and a better finish. The invention also relates to a machine suitable to perform such method. Background art Current varnishing methods do not allow to apply to sheets of decorative paper, PVC, or other materials a layer of varnish whose thickness is such as to allow subsequent sandpapering of the manufactured article and its adequate protection. Varnish can in fact be applied by spray or curtain coating only to panels. For thin facing sheets, a Mayer bar or a flexographic system or roller spreading are used. The Mayer bar, constituted by a cylindrical element covered by a spiral, is capable of depositing only a thin layer of varnish, and if the spiral is not perfectly clean it can cause scoring on the treated surface.

The flexographic system also only allows to deposit a thin layer of varnish.

With roller spreading, the resulting surface has a rough appearance; moreover, the rollers, by wearing out in their active region, can score any wider surfaces treated at a later time. Disclosure of the Invention The aim of the present invention is to deposit, on the thin sheets of various widths that are commonly used for facing panels, a layer of varnish whose thickness is such as to allow its subsequent sandpapering, in order to eliminate any imperfections and achieve a higher degree of protection and a better finish. Another object is to allow the most appropriate choice of the grammage of the varnish applied and to keep it uniform and independent of the sheet advancement speed.

Further objects of the invention are to eliminate varnish reclaiming, consequently eliminating contamination and aging of the varnish and formation of air bubbles.

The above aim and objects, and further objects which will become better apparent hereinafter, are achieved by a method for applying a thick layer of varnish to sheets used for facing in roll form, comprising the steps of: depositing a lamina of varnish onto a sheet which unwinds from a roll; and cross-linking the lamina to dry the lamina of varnish. Brief description of the drawings

The invention is now described in detail with reference to the accompanying drawings, which illustrate only by way of example a preferred embodiment of the machine suitable to perform the method according to the invention, wherein:

Figure 1 is a schematic view of the main elements of the machine. Figure 2 is a cross sectional view of the extrusion head, which deposits a layer of varnish on the sheet; Figure 3 is a front view of a part of the modular extrusion head.

Ways to carrying out the invention

In the figures, the reference numeral 1 designates a roll from which a sheet of paper 2 to be varnished unwinds, and the reference numeral 3 designates a reel for taking up the coated sheet. The reference numerals 4, 5 and 6 designate sheet advancement and guiding rollers. The numeral 7 designates a modular extrusion head, from a lower slit of which a uniform lamina of varnish 8 flows out and is spread onto the advancing sheet 2 at adjustable contrast bars 9. The varnish to be applied is sent to the extrusion head through one or more ducts 10 by means of a variable-speed gear pump 11 applied to a tank 12. The resin contained in the tank is mixed continuously by means of an agitator 13 in order to prevent settling of the photoactivating agent. The tank 12, the duct 10 and the extrusion head 7 are preferably thermostat-controlled in order to control the viscosity of the resin.

In order to achieve different varnishing widths, the extrusion head is divided into multiple side-by-side modules, shown in Figures 3 and 4 which can be activated separately by means of cocks or solenoid-activated valves 14. Moreover, the extrusion head is applied to an adjustable head support, which allows to vary its distance and inclination with respect to the sheet. The mechanism for feeding the sheet to be varnished, contrasted by the brake of the unwinding unit, determines the correct tension of said sheet.

The deposited layer of varnish is then dried by exposure to ultraviolet light emitted by one or more lamps 16 and reflected by mirrors 17 contained within a unit 18. The radiating unit is cooled by means of a delivery duct 19 and a return duct 20. In order to achieve uniform irradiation of the sheet 2, there is a suction belt 15, which is designed to keep the sheet perfectly flat during the step of drying of the varnish.

Since the extruded varnish is deposited entirely onto the advancing sheet, its recycling and the consequent drawbacks mentioned above are eliminated. The speed of the gear pump, the rate of advancement of the sheet, the temperature of the tank, of the extrusion head and of the corresponding duct, the modules to be activated and any other parameters are controlled by means of a computer, so as to obtain a uniform layer of varnish having the chosen grammage. The described method and machine are used to initially distribute the primer or insulating agent onto the sheet in roll form and then to apply the varnish resin by means of the same machine or by means of multiple in-line machines.

From what has been described and illustrated, it is evident that the specified aim and objects have been achieved. The method and the machine according to the invention might also be used for cross-linking processes achieved by means of hot air, infrared rays, electronic bombardment, et cetera, instead of by means of ultraviolet light.

Obviously, the nonessential constructive details might be different from the ones illustrated only by way of non-limitative example without thereby abandoning the scope of the present invention.

The disclosures in Italian Patent Application No. PS2000A000013 from which this application claims priority are incorporated herein by reference.

Claims

1. A method for applying a thick layer of varnish to sheets used for facing in roll form, comprising the steps of: depositing a lamina of varnish onto a sheet (2) which unwinds from a roll (1); and cross-linking the lamina to dry the lamina of varnish.
2. The method according to claim 1, characterized in that said lamina is of photochemical type and is subjected to ultraviolet light.
3. The method according to claim 1, characterized in that said lamina is deposited by means of an extrusion head composed by side-by side modules which can be activated separately depending on the width of the sheet.
4. The method according to claim 3, characterized in that said extrusion head is fed by an adjustable pump.
5. The method according to claim 1, characterized in that it further comprises the step of adjusting the tension of the sheet, a suction belt being provided to ensure the flatness of said lamina deposited onto said sheet when cross-linking is to be performed.
6. A machine for applying a thick layer of varnish to sheets used for facing in roll form, characterized in that it comprises: an extrusion head fed by a pump; a tank adapted to contain said varnish; and an adjustable pump adapted to draw said varnish from the tank and deposit it onto the sheet.
7. The machine according to claim 6, characterized in that it comprises an agitator arranged inside said tank.
8; The machine according to claim 6, characterized in that said tank and said extrusion head are thermostat-controlled.
9. The machine according to claim 6, characterized in that said extrusion head is composed of side-by -side modules which can be activated separately depending on the width of the sheet.
10. The machine according to claim 6, characterized in that said extrusion head is applied to an adjustable head support, which allows to vary its distance and inclination with respect to said sheet.
11. The machine according to claim 6, characterized in that said extrusion > head acts at adjustable contrast bars.
12. The machine according to claim 6, characterized in that it comprises a control unit adapted to control all the parameters of the process.
PCT/EP2001/009958 2000-09-05 2001-08-29 Method and machine for applying a thick layer of varnish to facing sheets in roll form WO2002020180A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITPS2000A000013 2000-09-05
ITPS20000013 2000-09-05

Publications (1)

Publication Number Publication Date
WO2002020180A1 true true WO2002020180A1 (en) 2002-03-14

Family

ID=11453513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/009958 WO2002020180A1 (en) 2000-09-05 2001-08-29 Method and machine for applying a thick layer of varnish to facing sheets in roll form

Country Status (1)

Country Link
WO (1) WO2002020180A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2149402A1 (en) * 2008-07-15 2010-02-03 düspohl Maschinenbau GmbH Method of coating a substrate with radiation cured paint

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1266745A (en) * 1969-06-11 1972-03-15
US4121535A (en) * 1977-03-16 1978-10-24 Inta-Rota, Incorporated Hot melt pumping apparatus
US4148274A (en) * 1974-10-15 1979-04-10 Agfa-Gevaert N.V. Processing apparatus
US4990364A (en) * 1986-12-04 1991-02-05 501 Schmalbach Lubeca Ag Solvent-free, low-monomer or monomer-free polymerizable hot melt coating process
US5520958A (en) * 1993-01-15 1996-05-28 Nordson Corporation System and method for applying a desired, protective finish to printed label stock
DE19516058A1 (en) * 1995-05-04 1996-11-07 Wolfgang Anger Laminating a film to a carrier using UV hardenable adhesive
US5605720A (en) * 1996-04-04 1997-02-25 J & M Laboratories Inc. Method of continuously formulating and applying a hot melt adhesive
US5614023A (en) * 1990-04-13 1997-03-25 Fuji Photo Film Co., Ltd. Apparatus for applying a thin film of magnetic liquid from an extrusion-type head to a flexible band-like web
US5958137A (en) * 1989-03-10 1999-09-28 Nextec Applications, Inc. Apparatus of feedback control for the placement of a polymer composition into a web
JP2000061388A (en) * 1998-08-21 2000-02-29 Dainippon Printing Co Ltd Coating method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1266745A (en) * 1969-06-11 1972-03-15
US4148274A (en) * 1974-10-15 1979-04-10 Agfa-Gevaert N.V. Processing apparatus
US4121535A (en) * 1977-03-16 1978-10-24 Inta-Rota, Incorporated Hot melt pumping apparatus
US4990364A (en) * 1986-12-04 1991-02-05 501 Schmalbach Lubeca Ag Solvent-free, low-monomer or monomer-free polymerizable hot melt coating process
US5958137A (en) * 1989-03-10 1999-09-28 Nextec Applications, Inc. Apparatus of feedback control for the placement of a polymer composition into a web
US5614023A (en) * 1990-04-13 1997-03-25 Fuji Photo Film Co., Ltd. Apparatus for applying a thin film of magnetic liquid from an extrusion-type head to a flexible band-like web
US5520958A (en) * 1993-01-15 1996-05-28 Nordson Corporation System and method for applying a desired, protective finish to printed label stock
DE19516058A1 (en) * 1995-05-04 1996-11-07 Wolfgang Anger Laminating a film to a carrier using UV hardenable adhesive
US5605720A (en) * 1996-04-04 1997-02-25 J & M Laboratories Inc. Method of continuously formulating and applying a hot melt adhesive
JP2000061388A (en) * 1998-08-21 2000-02-29 Dainippon Printing Co Ltd Coating method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 05 14 September 2000 (2000-09-14) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2149402A1 (en) * 2008-07-15 2010-02-03 düspohl Maschinenbau GmbH Method of coating a substrate with radiation cured paint

Similar Documents

Publication Publication Date Title
US6180172B1 (en) Process and apparatus for treating surfaces
EP1338344A2 (en) A method and system for coating
US5110634A (en) Process for making a surface modified polymer article
US5520958A (en) System and method for applying a desired, protective finish to printed label stock
US5832833A (en) Apparatus and method for drying a substrate printed on a multi-stand offset press
US20020121239A1 (en) Devices and methods for applying liquid coatings to substrates
WO1990015673A1 (en) A laminar impressor for coating flat substrates
US5958178A (en) Visual lamination with thermoplastic adhesives
EP0578886A1 (en) Sheet surface processing method and apparatus
US4443491A (en) Method of and apparatus for producing adhesive-coated sheet materials usable with radiation-cured silicone release coatings and the like
US3713935A (en) Process and apparatus for coating panels with resinous compositions
US20030152788A1 (en) Polymer-coated metal strip and method of production
US4493857A (en) Method for applying a coating to a thin board
US6660086B1 (en) Method and apparatus for extruding a coating upon a substrate surface
US4238533A (en) Coating process and apparatus
WO2012126816A1 (en) Device and method for impregnating a paper web
US3695223A (en) All purpose belt coater
US4039369A (en) Method and device for the uniform and even spraying of surfaces in a non-continuous production system
US4427729A (en) Glue chipped glass and method
US5083527A (en) Coating apparatus and coating rod
US3070457A (en) Apparatus and method for glossy wax coating
DE19625548A1 (en) Combined hot dip galvanising and resin coating of metal strip
US4871588A (en) Method and apparatus for accent coating of lap panels
US20080220167A1 (en) Method of controlling coating edge thickness in a web process
US5084303A (en) Method for producing faux finishes on non-porous surfaces

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC (EPO FORM 1205A DATED 20.05.2003)

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase in:

Ref country code: JP