GB2078136A - Process for powder coating substrates - Google Patents
Process for powder coating substrates Download PDFInfo
- Publication number
- GB2078136A GB2078136A GB8119312A GB8119312A GB2078136A GB 2078136 A GB2078136 A GB 2078136A GB 8119312 A GB8119312 A GB 8119312A GB 8119312 A GB8119312 A GB 8119312A GB 2078136 A GB2078136 A GB 2078136A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- heat
- process according
- powder
- substrate
- 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.)
- Granted
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
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A process for painting by powder coating a substrate comprises 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, confining the coating 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. The process allows a smooth or suitably surfaced layer to be directly applied to a substrate such as man-made fibre or particle boards, such as chipboard or hardboard. <IMAGE>
Description
SPECIFICATION
Process for the powder coating substrates
The present invention relates to a process 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
an oven, dried out the wood and can give rise to
an 'orange peel' effect which consumers may find
unappealing in certain contexts. If the substrate is
metallic and fiat, 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, confining the coating 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 texture 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
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
could 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 1 80 C where the coating powder is
an epoxy-polyester and 10 minutes at 1 80 C 'where the coating is a polyester/polyurethane; 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 y 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 1 1 and 12. Roller 1 1 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.
ín 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 around roilers 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 nqn-stick outer surface coating. An appropriate heat source 17 within heated band 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 (10)
1. 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, confining the coating 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.
2. A process according to claim 1 in which the uncoated substrate is chipboard or hardboard.
3. A process according to claim 1 or 2 in which the treatment surface is provided by a layer of heat-resistant release film.
4. A process according to any of the foregoing claims in which heat and pressure are applied for curing by a platen press.
5. A process according to any of claims 1 to 3 in which heat and pressure are applied for curing by a heated band.
6. A process according to any of the foregoing claims in which the treatment surface carries a texture.
7. A process according to claim 2 substantially as hereinbefore described with reference to
Figure 1 of the drawings.
8. A process according to claim 1 substantially as hereinbefore described with reference to
Figure 2 of the drawings.
9. A process according to claim 1 substantially as hereinbefore described with reference to
Figure 3 of the drawings.
10. A substrate when coated by the process of any of the foregoing claims.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8119312A GB2078136B (en) | 1980-06-24 | 1981-06-23 | Process for powder coating substrates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8020651 | 1980-06-24 | ||
GB8119312A GB2078136B (en) | 1980-06-24 | 1981-06-23 | Process for powder coating substrates |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2078136A true GB2078136A (en) | 1982-01-06 |
GB2078136B GB2078136B (en) | 1984-04-26 |
Family
ID=26275983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8119312A Expired GB2078136B (en) | 1980-06-24 | 1981-06-23 | Process for powder coating substrates |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2078136B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2164607A1 (en) * | 1999-07-15 | 2002-02-16 | Hymmen Theodor | Method for powder-coating wood panels etc has heating and pressure means to press coating at predetermined pressure onto workpiece |
US6488800B1 (en) | 1999-05-07 | 2002-12-03 | Firma Theodor Hynmen | Method for changing pulling off a cover web of a production roll to a storing roll |
WO2006000035A1 (en) * | 2004-06-25 | 2006-01-05 | Orica Australia Pty. Ltd. | Construction material and powder coating composition |
-
1981
- 1981-06-23 GB GB8119312A patent/GB2078136B/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6488800B1 (en) | 1999-05-07 | 2002-12-03 | Firma Theodor Hynmen | Method for changing pulling off a cover web of a production roll to a storing roll |
ES2164607A1 (en) * | 1999-07-15 | 2002-02-16 | Hymmen Theodor | Method for powder-coating wood panels etc has heating and pressure means to press coating at predetermined pressure onto workpiece |
WO2006000035A1 (en) * | 2004-06-25 | 2006-01-05 | Orica Australia Pty. Ltd. | Construction material and powder coating composition |
Also Published As
Publication number | Publication date |
---|---|
GB2078136B (en) | 1984-04-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990623 |