WO2008107517A1 - Method and device for coating a workpiece - Google Patents

Method and device for coating a workpiece Download PDF

Info

Publication number
WO2008107517A1
WO2008107517A1 PCT/FI2008/050101 FI2008050101W WO2008107517A1 WO 2008107517 A1 WO2008107517 A1 WO 2008107517A1 FI 2008050101 W FI2008050101 W FI 2008050101W WO 2008107517 A1 WO2008107517 A1 WO 2008107517A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
coating
coating substance
squirted
smeared
Prior art date
Application number
PCT/FI2008/050101
Other languages
French (fr)
Inventor
Torolf Pelin
Tomi Dahlberg
Original Assignee
Pintavision Oy
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 Pintavision Oy filed Critical Pintavision Oy
Publication of WO2008107517A1 publication Critical patent/WO2008107517A1/en

Links

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
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/266—Sputtering or spin-coating layers
    • 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
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides

Definitions

  • This invention relates to the method for coating a workpiece, where the surface of the workpiece is squirted/sprayed/smeared with a coating substance such as a hard varnish or a functional coating, after which the workpiece is brought to rotate so as to the coating substance spreads equally on the surface of a workpiece due to the centrifugal force, and where the coating substance is squirted/sprayed/smeared on the surface of the workpiece in the form of spout by means of a nozzle or is spread with a brush.
  • a coating substance such as a hard varnish or a functional coating
  • CD/DVD discs as known as a read surface is hard-coated by
  • the workpiece is a circular planar disc such as CD/DVD disc, where in the method the coating substance is squirted/sprayed/smeared on the lower surface of the workpiece, after which the products such as the protective lenses of mobile phones are cut off.
  • the coating substance can be squirted/sprayed/smeared on both sides of the workpiece.
  • squirtable/sprayable/smearable coating substances may vary.
  • a coating substance squirted/sprayed/smeared on the lower surface clings on the lower surface well enough due to the capillary force and the extra coating substance leaves due to the centrifugal force the same way as the coating substance smeared on the upper surface.
  • the workpieces of 3D forms can be coated, which have, for example, protective windows of curved forms, or other workpieces.
  • the invention is directed also to the device for coating a workpiece, said device including a workstation, where the workpiece is moved, which said workpiece is a circular planar disc such as CD/DVD disc, from which products such as the protective lenses of mobile phones is cut out, and which said workpiece is rotatable around an axis while squirting/spraying/smearing the coating substance on the workpiece, which said coating substance is smeared equally on the surface of the workpiece due to the centrifugal force.
  • a workstation where the workpiece is moved, which said workpiece is a circular planar disc such as CD/DVD disc, from which products such as the protective lenses of mobile phones is cut out, and which said workpiece is rotatable around an axis while squirting/spraying/smearing the coating substance on the workpiece, which said coating substance is smeared equally on the surface of the workpiece due to the centrifugal force.
  • a device according to the invention is characterised in that device comprises a squirt nozzle, a spout nozzle or a brush placed beneath the workpiece by which the lower surface of the workpiece is squirted/sprayed/smeared with the coating substance.
  • the device will be lower priced than the known devices and the working process speeds up, because both surfaces are coated simultaneously and in the same workstation.
  • the coating substance can be any known coating, which is dried by UV, infrared, a thermal drying method or by another known drying method, by which is sufficient adhesion of the coating substance is produced to the workpiece.
  • Figure 1 illustrates a coating method according to one embodiment, where the spout nozzle beneath the workpiece is movable
  • Figure 2 illustrates a coating method according to another embodiment, where the spout nozzle beneath the workpiece is stationary, and
  • Figure 3 illustrates a coating method according to a third embodiment, where there are spout nozzles both above and beneath and where a 3D-shaped workpiece is coated.
  • the coating substance 2 is spread on the upper surface of the workpiece 1 and simultaneously the coating substance 2 is squirted in the form of spout on the lower surface.
  • the coating substance on the upper surface smears due to the centrifugal force in the way indicated by the arrows 3 to the outer edge, where the extra coating substance leaves and gets in recycled and is thus reused.
  • the coating substance 2 is simultaneously squirted on the lower surface in the form of spout so that squirt nozzle 7 is moved in the way indicated by the arrow 4 in a direction of the radius from the center point outwards.
  • the coating substance squirted on the lower surface smears also due to the centrifugal force indicated by the arrows 3 to the outer edge, where the extra coating substance leaves and gets in recycled.
  • the proceedings in Figure 2 are the same as in Figure 1, but in this embodiment the nozzle 7 is not moved, instead the distance between the nozzle 7 and the workpiece is big enough that the coating substance 2 comes to the whole surface of the workpiece, when it is rotating and the extra coating substance smears in the way indicated by the arrows 3 and leaves the edge due to the centrifugal force.
  • spout nozzles 7 of the same kind are arranged to both the upper and the lower surface of the workpiece 1, which said nozzles both squirt the coating substance in the form of spout on both surfaces of the workpiece.
  • the workpiece 1 is 3D- shaped, so the workpiece has for example convex protective windows 5 that will be removed from it afterwards.
  • Protective windows of this kind are used e.g. in mobile phones and in another electronic devices.
  • the coating substance is smeared on both surfaces simultaneously and due to centrifugal force it will spread equally, after which the extra coating substance leaves the edge and gets recycled.

Abstract

The invention relates to the method for coating a workpiece (1), where the surface of the workpiece is squirted with a coating substance (2) such as a hard varnish, after which the workpiece is brought to rotate so as to the coating substance spreads (3) equally on the surface of a workpiece due to the centrifugal force. The coating substance (2) is squirted on the surface of the workpiece (1) in the form of spout.

Description

Method and device for coating a workpiece
Field of the invention
This invention relates to the method for coating a workpiece, where the surface of the workpiece is squirted/sprayed/smeared with a coating substance such as a hard varnish or a functional coating, after which the workpiece is brought to rotate so as to the coating substance spreads equally on the surface of a workpiece due to the centrifugal force, and where the coating substance is squirted/sprayed/smeared on the surface of the workpiece in the form of spout by means of a nozzle or is spread with a brush.
For example, while producing CD/DVD discs as known as a read surface is hard-coated by
"spin-coating" method. Varnish is trickled on the centre of the CD/DVD disc and after that the disc is rotated so fast that the varnish spreads equally on the whole surface of the disc. There will be a printing on the opposite side of the CD/DVD disc, which does not need to be hard-coated. Finnish patent 117621 discloses the producing of a workpiece with the CD/DVD disc producing technique. It is mentioned in the patent in question that the surface of a workpiece is coated so as to a "scratch free surface" is achieved. While producing protective lenses or other products with the CD/DVD producing technique both sides of the workpiece have to be coated in some cases. In addition, the workpiece might have several coating layers on its different sides. With coatings are usually striven, beside a scratch free feature, also other features such as non-reflectivity, non-dirtiness, electrical conductivity/non-conductivity, etc. There may be several of these coating layers. In publication WO2006/050230 it is disclosed how both layers of a workpiece are coated with a protective varnish so as to first the protective varnish is spread on the other side by using the "spincoating" method, after which the workpiece is turned and the opposite side is coated by using the same method. This arrangement needs an extra workstation, wherein the workpiece is turned. After turning, the workpiece is taken back either to a coating station or to another coating station in the line of the system. These arrangements raise the costs of apparatus related in the method and slow down the working process particularly if there are several coating layers. The purpose of this invention is to remove mentioned disadvantages. It is characterized to the method according to the invention that the workpiece is a circular planar disc such as CD/DVD disc, where in the method the coating substance is squirted/sprayed/smeared on the lower surface of the workpiece, after which the products such as the protective lenses of mobile phones are cut off. Thus the coating substance can be squirted/sprayed/smeared on both sides of the workpiece. In addition, squirtable/sprayable/smearable coating substances may vary. A coating substance squirted/sprayed/smeared on the lower surface clings on the lower surface well enough due to the capillary force and the extra coating substance leaves due to the centrifugal force the same way as the coating substance smeared on the upper surface. With a method according to the invention the workpieces of 3D forms can be coated, which have, for example, protective windows of curved forms, or other workpieces.
The invention is directed also to the device for coating a workpiece, said device including a workstation, where the workpiece is moved, which said workpiece is a circular planar disc such as CD/DVD disc, from which products such as the protective lenses of mobile phones is cut out, and which said workpiece is rotatable around an axis while squirting/spraying/smearing the coating substance on the workpiece, which said coating substance is smeared equally on the surface of the workpiece due to the centrifugal force. A device according to the invention is characterised in that device comprises a squirt nozzle, a spout nozzle or a brush placed beneath the workpiece by which the lower surface of the workpiece is squirted/sprayed/smeared with the coating substance. The device will be lower priced than the known devices and the working process speeds up, because both surfaces are coated simultaneously and in the same workstation. The coating substance can be any known coating, which is dried by UV, infrared, a thermal drying method or by another known drying method, by which is sufficient adhesion of the coating substance is produced to the workpiece.
Next the invention will be described in more detail with reference to the following drawings, where
Figure 1 illustrates a coating method according to one embodiment, where the spout nozzle beneath the workpiece is movable,
Figure 2 illustrates a coating method according to another embodiment, where the spout nozzle beneath the workpiece is stationary, and
Figure 3 illustrates a coating method according to a third embodiment, where there are spout nozzles both above and beneath and where a 3D-shaped workpiece is coated.
In Figure 1 the coating substance 2 is spread on the upper surface of the workpiece 1 and simultaneously the coating substance 2 is squirted in the form of spout on the lower surface. The coating substance on the upper surface smears due to the centrifugal force in the way indicated by the arrows 3 to the outer edge, where the extra coating substance leaves and gets in recycled and is thus reused. The coating substance 2 is simultaneously squirted on the lower surface in the form of spout so that squirt nozzle 7 is moved in the way indicated by the arrow 4 in a direction of the radius from the center point outwards. The coating substance squirted on the lower surface smears also due to the centrifugal force indicated by the arrows 3 to the outer edge, where the extra coating substance leaves and gets in recycled. The proceedings in Figure 2 are the same as in Figure 1, but in this embodiment the nozzle 7 is not moved, instead the distance between the nozzle 7 and the workpiece is big enough that the coating substance 2 comes to the whole surface of the workpiece, when it is rotating and the extra coating substance smears in the way indicated by the arrows 3 and leaves the edge due to the centrifugal force.
In Figure 3 spout nozzles 7 of the same kind are arranged to both the upper and the lower surface of the workpiece 1, which said nozzles both squirt the coating substance in the form of spout on both surfaces of the workpiece. In this embodiment, the workpiece 1 is 3D- shaped, so the workpiece has for example convex protective windows 5 that will be removed from it afterwards. Protective windows of this kind are used e.g. in mobile phones and in another electronic devices. The coating substance is smeared on both surfaces simultaneously and due to centrifugal force it will spread equally, after which the extra coating substance leaves the edge and gets recycled.

Claims

Claims
1. A method for coating a workpiece (1), where the surface of the workpiece is squirted/sprayed/smeared with a coating substance (2) such as a hard varnish or a functional coating, after which said workpiece is brought to rotate so as to the coating substance (3) spreads equally on the surface of the workpiece due to the centrifugal force, and where the coating substance is squirted/sprayed/smeared on the surface of the workpiece in the form of spout by the means of nozzle or is spread with a brush, characterized in that the workpiece (1) is a circular shaped planar disc such as a CD/DVD disc, in which method the coating substance is squirted/sprayed/smeared on the lower surface of the workpiece (1), after which the products such as the protective lenses of mobile phones are cut off.
2. A method according to claim 1, characterized in that the coating substance (2) is squirted on both the upper and the lower surface of the workpiece (1).
3. A method according to claim 1 or claim 2, characterized in that a squirt nozzle
(1)1 a spout nozzle or a brush is moved (4) during the squirting in a direction of the radius from the center point outwards.
4. A method according to any preceding claim, characterized in that the coating substance (2) is squiited/sprayed/smeared on the workpiece (1) that is 3D-shaped (Fig. 3).
5. A method according to any preceding claim, characterized in that the different sides of the workpiece are subjected to more than one coating.
6. A method according to any preceding claim, characterized in that the different sides of the workpiece are subjected to different coating substances in the same work place.
7. A method according to any preceding claim, characterized in that the nozzle is linear and the coating is spread by rotating the workpiece or by carrying the nozzle over the workpiece.
8. A method according to any preceding claim, characterized in that the spread coating substance is in the form of liquid, for example as water-soluble, solvent-based, a liquid polymer or in another liquid form.
9. A method according to any preceding claim, characterized in that the spread coating substance is in the form of powder or flour.
10. A device for implementing the method according to claim 1, comprising a workstation, where the workpiece (1) is moved, which said workpiece is circular shaped planar disc such as a CD/DVD disc, wherefrom the products such as the protective lenses of mobile phones are cut off, and which workpiece is rotatable around an axis (6) when coating substance (2) has been squirted/sprayed/smeared on the workpiece, which said coating substance smears equally on the surface of the workpiece due to the centrifugal force, characterized in that the device comprises a squirt nozzle (7)/a spout nozzle/a brush placed beneath the workpiece (1) by which the lower surface of the workpiece is squirted/sprayed/smeared with the coating substance (2).
11. A method or a device according to any preceding claim, characterized in that in addition to the spread coating the workpiece is also subjected to other coatings such as a coating by sputtering, reactive sputtering, anodic treatment, vacuum evaporation, vacuum evaporation by using the laser or by another coating method in the same device or in the same manufacturing process.
PCT/FI2008/050101 2007-03-05 2008-03-03 Method and device for coating a workpiece WO2008107517A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20070189A FI20070189L (en) 2007-03-05 2007-03-05 Method for surface coating a workpiece and device for surface coating the workpiece
FIFI20070189 2007-03-05

Publications (1)

Publication Number Publication Date
WO2008107517A1 true WO2008107517A1 (en) 2008-09-12

Family

ID=37929994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050101 WO2008107517A1 (en) 2007-03-05 2008-03-03 Method and device for coating a workpiece

Country Status (2)

Country Link
FI (1) FI20070189L (en)
WO (1) WO2008107517A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113492A (en) * 1976-04-08 1978-09-12 Fuji Photo Film Co., Ltd. Spin coating process
JPS63222327A (en) * 1987-03-11 1988-09-16 Fujitsu Ltd Production of magnetic disk
JPH0576814A (en) * 1992-02-10 1993-03-30 Tokyo Electron Ltd Coating device
EP0556784A1 (en) * 1992-02-18 1993-08-25 Nec Corporation Film forming method in producing of semiconductor device
US5916631A (en) * 1997-05-30 1999-06-29 The Fairchild Corporation Method and apparatus for spin-coating chemicals
JP2004127445A (en) * 2002-10-04 2004-04-22 Fujitsu Ltd Spin coating system for deposition on both sides
US20040250839A1 (en) * 2003-06-12 2004-12-16 National Semiconductor Corporation Dual outlet nozzle for the combined edge bead removal and backside wash of spin coated wafers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113492A (en) * 1976-04-08 1978-09-12 Fuji Photo Film Co., Ltd. Spin coating process
JPS63222327A (en) * 1987-03-11 1988-09-16 Fujitsu Ltd Production of magnetic disk
JPH0576814A (en) * 1992-02-10 1993-03-30 Tokyo Electron Ltd Coating device
EP0556784A1 (en) * 1992-02-18 1993-08-25 Nec Corporation Film forming method in producing of semiconductor device
US5916631A (en) * 1997-05-30 1999-06-29 The Fairchild Corporation Method and apparatus for spin-coating chemicals
JP2004127445A (en) * 2002-10-04 2004-04-22 Fujitsu Ltd Spin coating system for deposition on both sides
US20040250839A1 (en) * 2003-06-12 2004-12-16 National Semiconductor Corporation Dual outlet nozzle for the combined edge bead removal and backside wash of spin coated wafers

Also Published As

Publication number Publication date
FI20070189L (en) 2008-09-06
FI20070189A0 (en) 2007-03-05

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