EP0689480A1 - Two stage powder application method - Google Patents
Two stage powder application methodInfo
- Publication number
- EP0689480A1 EP0689480A1 EP94910938A EP94910938A EP0689480A1 EP 0689480 A1 EP0689480 A1 EP 0689480A1 EP 94910938 A EP94910938 A EP 94910938A EP 94910938 A EP94910938 A EP 94910938A EP 0689480 A1 EP0689480 A1 EP 0689480A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- powder
- particles
- stage
- during
- 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
- 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
- B05D7/50—Multilayers
- B05D7/52—Two 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate 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
- B05D2451/00—Type of carrier, type of coating (Multilayers)
Definitions
- This invention relates to an improved method for powder coating.
- the thickness of the coating For instance, if a relatively thick
- particles having a thick diameter are used. If a
- particles having a thin diameter are used.
- the applied coating or film does not always appear level and smooth, even if heating is
- the coating material is a thermosetting polymer.
- the coating looks uneven, like the external surface of a lemon, an
- linearity it difficult to maintain a straight flight path for long distances.
- the ability to maintain a straight flight path is referred to as linearity.
- powder having a relatively small or fine particle size has a high manufacturing cost.
- the present invention achieves the above-stated objectives by a two step particle application method which involves initially applying large size particles to a coating surface, followed by
- the average particle diameter for the powder applied during the second stage is 0.1 to 15 microns.
- the particles are applied by spraying.
- the larger sized particles applied during the first stage may be temporarily heated to cause partial melting and increased adherence. Subsequently, when the second stage particles are
- heat may again be used to melt the applied powder particles.
- Stages A and B may be repeated as necessary, to
- application method is increased adhesion efficiency. Also, by initially applying the larger sized particles, the desired film thickness can be achieved, while subsequent application of the smaller sized particles improves overall leveling and surface appearance.
- Fig. 1 is a cross-sectional view which schematically shows a powder coating achieved with the two stage powder application method of this invention, wherein the coated surface is flat.
- Fig. 2 is a cross-sectional view, similar to Fig. 1 , which
- FIG. 1 schematically shows a powder coating achieved with the two stage powder coating method of this invention, wherein the coated surface has a recess.
- Fig. 3 is a cross-sectional view, similar to Figs. 1 and 2 wherein the powder particles applied during the first stage are heated to achieve melting on the surface before the second stage
- Fig. 1 depicts a surface 1 1 to be coated, and in this case
- the two stage powder application method of this invention involves initially applying to the surface 11 a powder 12 having a relatively large particle diameter.
- a powder 12 having a relatively large particle diameter Preferably,
- the powder 12 has an average particle diameter in the range of about 15 to 120 microns. Subsequently, a powder 13 having a relatively small particle diameter is applied.
- the powder 12 has an average particle diameter in the range of about 15 to 120 microns.
- the powder applied during the first and second stages are applied by spraying.
- Fig. 2 illustrates another advantage of this two stage powder application method, an advantage which relates particularly to coating objects or articles which have an external
- the two stage powder application method of this invention achieves both of these objectives,
- Fig. 2 illustrates a portion of the surface 1 1 which has a recess 15 formed therein. Again, the coating on
- the surface 1 1 comprises an initial application of relatively large
- relatively large particles 12 used in the first stage of this method assure uniform coating within the recess 15, since the larger particles can penetrate into the recess to be deposited thereon,
- particles is formed of powder made of materials which are tough and have desired properties, such as chemical and/or weather resistance.
- Another advantage of this invention relates to achieving a matted tone, a suede tone or a hammer tone coating for an article.
- a hammer tone film can be achieved.
- this two stage powder application method involves temporarily heating the large size particles to melt them and subsequently applying the small size particles to cover the voids or pinholes in areas where the coating is thin or packed by air bubbles. This makes it possible to obtain a high quality film with
- Fig. 3 where reference numeral 16 designates the initially applied large particle diameter powder which is in a molten state due to temporary heating.
- the invention contemplates the use of various types of powder. It is preferable to use an organic powder during the first stage, due to better adhesive properties. However, a mixture of inorganic and organic powders or a powder in which an organic powder is surrounded by organic capsules may also be used.
- This invention results in a high performance powder coating with
- compatibility may be poor and/or a phenomenon referred to
- the phenomenon of levelling depends to a large extent on the surface tension during the melting of the powder materials. It has been found that a surface tension of 40 dyne/cm is preferred during melting of the powder. To maximize cost savings and productivity, it is desirable to use relatively large amounts of the large particle diameter powder and to increase the amount used during Stage A of particle application, since this powder is relatively inexpensive compared to the fine powder. Also, by applying successive layers of powder having a
- the overall performance of the applied film can be
- this can be achieved by repeated application in overlapping layers or dispersion application of large diameter particles comprising a mixture of polyester and an isocyanate functional group and small diameter particles in which block isocyanate is encapsulated, followed by heating and melting
- powder application method produces a film or coating with
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP81440/93 | 1993-03-15 | ||
JP08144093A JP3368434B2 (en) | 1993-03-15 | 1993-03-15 | Powder application method |
PCT/US1994/002743 WO1994021385A1 (en) | 1993-03-15 | 1994-03-14 | Two stage powder application method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0689480A1 true EP0689480A1 (en) | 1996-01-03 |
EP0689480B1 EP0689480B1 (en) | 1998-10-07 |
Family
ID=13746460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94910938A Expired - Lifetime EP0689480B1 (en) | 1993-03-15 | 1994-03-14 | Two stage powder application method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0689480B1 (en) |
JP (1) | JP3368434B2 (en) |
AU (1) | AU6365294A (en) |
DE (1) | DE69413809T2 (en) |
WO (1) | WO1994021385A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9751107B2 (en) | 2012-03-21 | 2017-09-05 | Valspar Sourcing, Inc. | Two-coat single cure powder coating |
WO2013141915A1 (en) | 2012-03-21 | 2013-09-26 | Valspar Sourcing, Inc. | Two-coat single cure powder coating |
NL2019197B1 (en) * | 2017-07-07 | 2019-01-16 | Stahl Int B V | Powder coating method and coated article |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3348995A (en) * | 1964-03-09 | 1967-10-24 | American Cast Iron Pipe Co | Method of coating metal surfaces with polyethylene utilizing a polyethylene primer and articles produced thereby |
DE8816295U1 (en) * | 1988-03-02 | 1989-07-06 | Heinzel, Winfried, 7758 Meersburg | Coated plate for household appliances |
-
1993
- 1993-03-15 JP JP08144093A patent/JP3368434B2/en not_active Expired - Lifetime
-
1994
- 1994-03-14 WO PCT/US1994/002743 patent/WO1994021385A1/en active IP Right Grant
- 1994-03-14 AU AU63652/94A patent/AU6365294A/en not_active Abandoned
- 1994-03-14 DE DE69413809T patent/DE69413809T2/en not_active Expired - Fee Related
- 1994-03-14 EP EP94910938A patent/EP0689480B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9421385A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69413809D1 (en) | 1998-11-12 |
JPH06262137A (en) | 1994-09-20 |
WO1994021385A1 (en) | 1994-09-29 |
AU6365294A (en) | 1994-10-11 |
EP0689480B1 (en) | 1998-10-07 |
DE69413809T2 (en) | 1999-03-04 |
JP3368434B2 (en) | 2003-01-20 |
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