EP0042759B1 - Process for powder coating substrates - Google Patents
Process for powder coating substrates Download PDFInfo
- Publication number
- EP0042759B1 EP0042759B1 EP81302819A EP81302819A EP0042759B1 EP 0042759 B1 EP0042759 B1 EP 0042759B1 EP 81302819 A EP81302819 A EP 81302819A EP 81302819 A EP81302819 A EP 81302819A EP 0042759 B1 EP0042759 B1 EP 0042759B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- heat
- powder
- curing
- process according
- 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
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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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
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- 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
- B05D3/00—Pretreatment 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
- B05D3/02—Pretreatment 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 baking
- B05D3/0254—After-treatment
Definitions
- the present invention relates to a processor for painting by powder coating substrates and to substrates when so coated.
- the substrate is a poor electrostatic conductor, such as wood
- powder coating has been difficult to apply electrostatically without the presence of an extra conductive layer of resin base. Further, extensive heating of wood, as in an oven, dries out the wood and can give rise to an 'orange peer effect which consumers may find unappealing in certain contexts. If the substrate is metallic and flat, powder coating again has tended to produce an 'orange peel' effect.
- a process for painting by powder coating a substrate comprising applying a dry curable coating powder to a dry uncoated substrate which is either a self-supporting panel or can be divided into such a panel and heat-curing the coating, characterised in that the coating is confined by applying firmly thereto a treatment surface which does not adhere to the coating and is heat-stable up to the curing temperature of the coating powder, and heat-curing the coating whilst so confined.
- a specifically textured finish, or other finish may be applied to be substrate.
- the treatment surface may be a roller or heated band of platen having a non-stick surface but is preferably a heat-resistant release film applied by the platen of a press.
- Mylar has been found to be particularly suitable as a release film. As indicated previously, an appropriate surface of the release film gives a corresponding surface to the final coating; thus satin finish Mylar would give a satin final finish and gloss finish Mylar would give a gloss final finish. Further a suitable treatment surface on the release film or platen, roller or heated band would be used to apply texture, such as wood- grain or cloth weave texture, to the final coating.
- the substrate may be any material which is in the form of a self-supporting panel or can be divided into such a panel and to which a powder coating would be applied as a surface coating layer, but it is particularly preferred to apply the process of the present invention to the coating of man made fibre or particle boards such as chipboard or hardboard.
- suitable heating cycles would be 3 minutes at 180°C where the coating powder is an expoxy-polyester and 10 minutes at 180°C where the coating is a polyester/poly- urethane; although shorter heating times are desirably used. Although a wide range of pressures may be used, the pressure employed would normally only be light and just sufficient pressure to slightly squash the coating surface during fusing is generally adequate.
- a thickness of powder coating in the region of 35 to 75 ⁇ has been found to be satisfactory, although a somewhat thicker or thinner coating may be used if desired.
- a substrate 1, which is in this instance a chipboard panel has applied thereto powder coating 2 by a spray or blade curtain coating ,apparatus, at station A, D or G.
- the coated board 1 is then transported to station B where it is supported between the upper and lower portions 9 and 8 of a platen press.
- a surface of heat resistant release film 5, which is of Mylar, is interposed between the upper portion 9 of the platen press, and the powder 2 previously applied to board 1. Pressure and heat is then applied by the platen press; the time and temperature being determined by the powder type used.
- the board 1 having a smooth or suitably textured surface 3 is transported to station C.
- the coated board from station D is transported to station E and is passed through a heated roller press comprising rollers 11 and 12.
- Roller 11 is heated and has its surface covered with a Mylar release film 5.
- the pressure, temperature and speed of transport through the roller press are again adjusted to be appropriate to the powder type used.
- the finished board 1 having the desired surface 3 is thereafter transported to station F.
- the coated board from station G is transported to station H where it is passed beneath a conventional heated band apparatus, comprising a heated band 19 passing around rollers 13 and 15.
- the heated band 19 may carry a layer of heat-resistant release film on its outer surface or may have an appropriate non-stick outer surface coating.
- An appropriate heat source 17 within heated band 19 is provided for curing powder 2.
- the pressure, temperature and speed of transport are adjusted to be appropriate to the powder type used.
- the finished board 1 having the desired surface 3 is thereafter transported to station /.
- the hot band system has the greatest potential for large production quantities and is therefore preferred where coated boards are to be mass produced.
Abstract
Description
- The present invention relates to a processor for painting by powder coating substrates and to substrates when so coated.
- Continuing increases in the cost of raw materials, and in particular oil-based solvents have increased the importance of powder coating processes (which dispense with carriers and solvents) relative to conventional paint coating (in which a considerable proportion of solvent is merely evaporated-off and lost during drying).
- Where the substrate is a poor electrostatic conductor, such as wood, powder coating has been difficult to apply electrostatically without the presence of an extra conductive layer of resin base. Further, extensive heating of wood, as in an oven, dries out the wood and can give rise to an 'orange peer effect which consumers may find unappealing in certain contexts. If the substrate is metallic and flat, powder coating again has tended to produce an 'orange peel' effect.
- According to the present invention we provide a process for painting by powder coating a substrate comprising applying a dry curable coating powder to a dry uncoated substrate which is either a self-supporting panel or can be divided into such a panel and heat-curing the coating, characterised in that the coating is confined by applying firmly thereto a treatment surface which does not adhere to the coating and is heat-stable up to the curing temperature of the coating powder, and heat-curing the coating whilst so confined. Depending on the nature of the treatment surface gloss or satin finish, a specifically textured finish, or other finish, may be applied to be substrate.
- The treatment surface may be a roller or heated band of platen having a non-stick surface but is preferably a heat-resistant release film applied by the platen of a press. Mylar has been found to be particularly suitable as a release film. As indicated previously, an appropriate surface of the release film gives a corresponding surface to the final coating; thus satin finish Mylar would give a satin final finish and gloss finish Mylar would give a gloss final finish. Further a suitable treatment surface on the release film or platen, roller or heated band would be used to apply texture, such as wood- grain or cloth weave texture, to the final coating.
- The substrate may be any material which is in the form of a self-supporting panel or can be divided into such a panel and to which a powder coating would be applied as a surface coating layer, but it is particularly preferred to apply the process of the present invention to the coating of man made fibre or particle boards such as chipboard or hardboard.
- Examples of suitable heating cycles would be 3 minutes at 180°C where the coating powder is an expoxy-polyester and 10 minutes at 180°C where the coating is a polyester/poly- urethane; although shorter heating times are desirably used. Although a wide range of pressures may be used, the pressure employed would normally only be light and just sufficient pressure to slightly squash the coating surface during fusing is generally adequate.
- A thickness of powder coating in the region of 35 to 75 µ has been found to be satisfactory, although a somewhat thicker or thinner coating may be used if desired.
- The process of the present invention will now be illustrated with reference to the accompanying drawings, in which:
- Figure 1 shows diagrammatically one embodiment of a process according to the present invention,
- Figure 2 shows diagrammatically an alternative embodiment of a process according to the present invention, and
- Figure 3 shows diagrammatically a further embodiment of a process according to the present invention.
- A substrate 1, which is in this instance a chipboard panel has applied thereto powder coating 2 by a spray or blade curtain coating ,apparatus, at station A, D or G.
- As shown in Figure 1, the coated board 1 is then transported to station B where it is supported between the upper and lower portions 9 and 8 of a platen press. A surface of heat resistant release film 5, which is of Mylar, is interposed between the upper portion 9 of the platen press, and the powder 2 previously applied to board 1. Pressure and heat is then applied by the platen press; the time and temperature being determined by the powder type used. When the powder has cured, the board 1 having a smooth or suitably textured surface 3 is transported to station C.
- In the embodiment of Figure 2, the coated board from station D is transported to station E and is passed through a heated roller press comprising rollers 11 and 12. Roller 11 is heated and has its surface covered with a Mylar release film 5. The pressure, temperature and speed of transport through the roller press are again adjusted to be appropriate to the powder type used. The finished board 1 having the desired surface 3 is thereafter transported to station F.
- In the process shown in Figure 3, the so- called hot-band system, the coated board from station G is transported to station H where it is passed beneath a conventional heated band apparatus, comprising a heated
band 19 passing aroundrollers band 19 may carry a layer of heat-resistant release film on its outer surface or may have an appropriate non-stick outer surface coating. Anappropriate heat source 17 within heatedband 19 is provided for curing powder 2. As in the embodiment of Figure 2, the pressure, temperature and speed of transport are adjusted to be appropriate to the powder type used. The finished board 1 having the desired surface 3 is thereafter transported to station /. - The hot band system has the greatest potential for large production quantities and is therefore preferred where coated boards are to be mass produced.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81302819T ATE11878T1 (en) | 1980-06-24 | 1981-06-23 | METHOD OF POWDER COATING OBJECTS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8020651 | 1980-06-24 | ||
GB8020651 | 1980-06-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0042759A1 EP0042759A1 (en) | 1981-12-30 |
EP0042759B1 true EP0042759B1 (en) | 1985-02-20 |
Family
ID=10514277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81302819A Expired EP0042759B1 (en) | 1980-06-24 | 1981-06-23 | Process for powder coating substrates |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0042759B1 (en) |
AT (1) | ATE11878T1 (en) |
DE (1) | DE3169018D1 (en) |
IE (1) | IE51301B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU616735B2 (en) * | 1988-02-29 | 1991-11-07 | Metchem Pty. Limited | Novel method for the decorating and protective coating of floor surfaces |
US5000997A (en) * | 1989-02-06 | 1991-03-19 | The Budd Company | Method for making a painted part and part made thereby |
KR19990082069A (en) * | 1996-02-02 | 1999-11-15 | 에프. 아. 프라저, 에른스트 알테르 (에. 알테르), 한스 페터 비틀린 (하. 페. 비틀린), 피. 랍 보프, 브이. 스펜글러, 페. 아에글러 | Storage stable molding powder of epoxy resin base material |
US6309492B1 (en) * | 1998-09-16 | 2001-10-30 | Marc A. Seidner | Polymer fill coating for laminate or composite wood products and method of making same |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE847968C (en) * | 1950-11-23 | 1952-08-28 | Basf Ag | Process for the production of coatings and foils from polyethylene |
NL122056C (en) * | 1958-03-13 |
-
1981
- 1981-06-12 IE IE1313/81A patent/IE51301B1/en unknown
- 1981-06-23 AT AT81302819T patent/ATE11878T1/en not_active IP Right Cessation
- 1981-06-23 EP EP81302819A patent/EP0042759B1/en not_active Expired
- 1981-06-23 DE DE8181302819T patent/DE3169018D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ATE11878T1 (en) | 1985-03-15 |
IE811313L (en) | 1981-12-24 |
EP0042759A1 (en) | 1981-12-30 |
IE51301B1 (en) | 1986-11-26 |
DE3169018D1 (en) | 1985-03-28 |
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