EP0933140A1 - Procédé pour le revêtement des objets à base de bois avec des revêtements en poudre - Google Patents
Procédé pour le revêtement des objets à base de bois avec des revêtements en poudre Download PDFInfo
- Publication number
- EP0933140A1 EP0933140A1 EP99300655A EP99300655A EP0933140A1 EP 0933140 A1 EP0933140 A1 EP 0933140A1 EP 99300655 A EP99300655 A EP 99300655A EP 99300655 A EP99300655 A EP 99300655A EP 0933140 A1 EP0933140 A1 EP 0933140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- product
- powder
- board
- coating
- temperature
- 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.)
- Withdrawn
Links
Images
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
- B05D7/08—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 using synthetic lacquers or varnishes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
-
- 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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/16—Arrangements for supplying liquids or other fluent material
- B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
Definitions
- This invention relates to a method of powder coating a wood-based product and is concerned more particularly, but not exclusively, with powder coating of a board, such as medium density fibreboard (MDF).
- MDF medium density fibreboard
- Powder coating of metal products is conventionally effected by an electrostatic coating process in which a charged powder is caused to adhere to an earthed product by electrostatic attraction, and the coated product is subsequently stoved to cause the powder to form a hard coat which is bonded to the surface of the product.
- electrostatic coating process in which a charged powder is caused to adhere to an earthed product by electrostatic attraction, and the coated product is subsequently stoved to cause the powder to form a hard coat which is bonded to the surface of the product.
- Such a process is widely used to provide hard coatings of different textures on the surfaces of metal products.
- this coating process relies on the conductivity of the metal, and is not capable of providing a satisfactory powder coating on a product made of a material of low conductivity, such as a wood-based board. Because of the low conductivity of the board the powder will tend not to adhere properly to the surface, and furthermore the application of excessive heat in the subsequent stoving process is undesirable due to the heat sensitivity of the board.
- JP 610252154A and JP 610252155A disclose preheating a resin-covered wood board prior to painting or spraying it with a mixed resin powder and heat-pressing the powder against the board.
- JP 510101043A discloses a method of preheating a substrate to a temperature above the melting initiation temperature but below the decomposition temperature of the powder/paint, prior to coating of the substrate.
- the paint is caused to melt or cure by the heat to provide the required bonding to the surface.
- Such a method may not produce a sufficiently even coating on the surface of the substrate for certain applications.
- a method of powder coating a wood-based product comprising preheating the product to an elevated temperature sufficient to increase the electrical conductivity at the surface of the product, spraying a cloud of coating powder onto the surface of the heated product so that a coating of powder is formed on the product by electrostatic attraction, and heating the coated product to a curing temperature, higher than said elevated temperature, to cause the coating to harden and bond with the surface of the product on cooling of the product to room temperature.
- Such a method is capable of applying a good quality homogenous power coating to MDF, HDF and other types of board, as well as other wood-based products, in an economical manner and without degrading the product.
- the product is initially painted or unpainted, it is important that the heat applied to the product is controlled such that no part of the product is subjected to excessive temperatures which might result in the product splitting or in bubbles appearing on the surface.
- the coating is applied without requiring any further pretreatment of the product surface, other than any necessary surface smoothing or abrasion such as sanding, and without the application of pressure.
- MDF medium density fibreboard
- the invention also provides an electrically conductive jig for holding a wood-based product during conveying of the product through a powder coating zone in which a coating of powder is formed on the product by electrostatic attraction, the jig comprising an electrically conductive suspension part adapted to be suspended from a conveying line and to establish an electrical connection to the conveying line, the suspension part having an end portion adapted to be introduced into a recess in the product to establish mechanical and electrical connection with the product, and a heat resistant, electrically insulating sleeve provided on said end portion to enable powder coverage of the product in the vicinity of said end portion without destroying the electrical connection between said end portion and the product.
- the method may be used to coat the board or other product with various types of powder coating so as to provide coatings of different colours and textures.
- the powder with which the board is coated is one which cures at a relatively low temperature no greater than 160°C, and preferably no greater than 140°C.
- Such a powder exhibiting low temperature curing has particular advantages in coating of the board as will be understood from the description given below.
- the powder may be an epoxy polyester powder or a pure epoxy powder or a pure polyester powder.
- each MDF board is shaped and abraded so as to provide a smooth surface to the board and so as to ensure that any edges are rounded off so as to have a radius of curvature of not less than 3mm.
- the prepared boards are then loaded on to the conveying line 2 by being suspended from the moving line in a loading area 3.
- the boards are then conveyed into a preheat oven 4 in which the surface of each board is heated to an elevated temperature of 40°C to 100°C, preferably about 75°C so as to increase the electrical conductivity at the surface of the board. It is believed that the resultant increase in the surface conductivity is caused by moisture being drawn from within the board to the surface.
- the preheat oven 4 may comprise a conventional convection oven utilising recirculating gas or air and running at a temperature of about 160°C. Additionally or alternatively it may comprise an infrared catalytic oven in which flash heating of the board is effected on passing of the board between two catalytic panels in the oven. Such flash heating does not heat the board right through so that heat loss from the board surface occurs more quickly than in a conventional oven.
- the use of an infrared oven is advantageous as it allows the heating to be effected more quickly and in a more directed manner than in a convection oven. There is also probably less chance of the board drying out in use of such an infrared oven.
- the infrared oven may be run at a temperature of about 450°C in which case the board need remain in the oven for only about two minutes (or less if used in association with a conventional preheat oven).
- Each board is then passed directly from the preheat oven 4 to a powder coating booth 5 in which the board is treated whilst at a temperature of about 55°C. It should be appreciated that the board is previously heated in the preheat oven to a temperature appreciably greater than 55°C, for example about 75°C, to allow for the limited cooling that occurs in the one to two minutes or less between heating and subsequent coating, and it is believed that such limited cooling may assist formation of moisture at the surface of the board.
- the board 6 suspended from the conveying line 2 by conductive straps 7 is passed between two or more powder guns 8, only one of which is shown in the figure in order to render it easier to read.
- Each powder gun 8 is connected to a powder source 9 by a pipe 10 and to a high voltage generator 11 by an electrical lead 12.
- the conveying line 2 is connected to earth by an electrical lead 14 so as to establish an earth connection to the board 6 by way of the straps 7.
- the function of the generator 11 is to apply a negative voltage, typically of 40 to 100 kV, to a charging point within the gun 8 so that the powder cloud 15 sprayed from the gun 8 consists of negatively charged powder particles which are caused to adhere to the surface of the board 6 by electrostatic attraction.
- the ejection of the powder from the gun 8 may be assisted by air pressure, and the electrostatic charging of the powder may be either by corona charging, using a corona point positioned either internally of the gun or externally at the outlet of the gun, or by tribo charging, or even by combination of such charging methods.
- the coating process may alternatively be effected using positively charged powder particles and a negative earth.
- the board is then transported along the conveying line 2 to a conventional stoving oven 20 utilising recirculating gas and air, with care being taken not to break the relatively loose adherence of the powder coating 17 on the board 6 by rubbing or blowing the powder off the board, for example.
- the board 6 is then heated within the stoving oven 20 to a temperature of about 140°C for approximately 15 minutes.
- the board may first be passed through an infrared catalytic oven running at a temperature of about 350-380°C in which the powder coating is precured for approximately 1 minute, before the board is conveyed to the conventional oven. This enables the time for which the board remains in the conventional oven to be decreased to about 7 minutes. It would also be possible for curing of the powder coating to be effected solely by heating within a catalytic oven.
- the powder with which the board 6 is coated is such that the powder coating can be cured at relatively low temperature, that is less than 160°C, and preferably less than 140°C. This has the advantage that it is not necessary to heat the board up to a very high temperature which might lead to blistering of the board due to chemical reaction with the resins and other constituents of the board.
- the heat applied by the stoving oven 20 causes the powder coating to flow and results in cross-linking and curing of the powder to form a hard coating meshed to the surface of the board 6 on subsequent cooling of the board.
- each board After stoving, each board is transported from the oven 20 to a cooling area 21 in which the boards are cooled by circulation of air by a fan 22. Alternatively the boards may be allowed to cool naturally or may be force-cooled by refrigeration. After such cooling the boards are removed from the conveying line 2 and suspended from storage rails for further cooling or storage, or alternatively supplied to a packaging station.
- each board 6 is suspended from the conveying line 2 by at least one conductive strap 7 which not only supports the board 6 but also establishes an earth connection to the board 6.
- the conductive strap 7 being made of metal tends to attract charged powder particles to it during the powder coating process, and thus has a tendency to produce a halo 31 around the recess 30 in the board 6 which acts as the suspension point, as shown in Figure 4.
- the halo 31 is in the form of an annular area of the board surface surrounding the recess 30 which is not coated by the powder due to the presence of the conductive strap 7.
- the attraction of the powder particles to the conductive strap 7 is so great that it also affects the coverage on the whole of the side of the board 6 which faces the strap 7, that is the side containing the recess 30, whereas the other side of the board is substantially unaffected by the presence of the strap 7 and good powder coverage is obtained on that side.
- This problem may be reduced by the application of several coats of powder to the board surface over a period of time, but the problem is still not eliminated and the powder coating is still adversely affected by the strap 7.
- the conductive strap 7 incorporates a metal jig 32, as shown in side view in the bottom part of the figure, having a hook 33 which is intended to be hooked over a hanger 34 suspended from the conveying line 2 when the board is attached to the conveying line 2, and a suspension part 35 fitted with a non-conductive, heat-resistant sleeve 36 from which the board is suspended.
- the material of the sleeve 36 may be PTFE for example.
- the detailed view A in the figure shows the end of the suspension part 35, and in particular the welded-on conductive rod 37 which projects from the end of the sleeve 36 and is threaded so as to establish a mechanical and electrical connection when introduced into the recess 30 in the board 6. Because the suspension part 35 is covered by the sleeve 36 the powder particles are not attracted to the part 35 and the halo 31 is not produced around the recess 30 during the coating process. Thus the use of the jig 32 incorporating the sleeve 36 results in consistent powder coating over the entire surface of the board 6.
- Example 1 The method in accordance with the invention is further illustrated with respect to Example 1 below which can be contrasted with Example 1 and 3 to demonstrate the usefulness of the invention.
- a MDF monitor shelf was conveyed to a powder coating zone without being preheated prior to powder coating. Within the powder coating zone the shelf was coated for a period of about 1 minute with a coating of an epoxy polyester powder having the property that it can be cured at 140°C in 10 minutes.
- the particular powder used was ultra-low cure powder 293000C 7863 supplied by Sonneborn and Rieck, Essex, UK.
- the powder was applied using six powder guns with a charging voltage of 90 kV and forward and dilution air settings of 10 and 7 respectively, the initial powder settings of the first and third guns being 35, of the second gun being 30 and of the other three guns being 40, and the conveying track speed being 11.69 feet per minute.
- the monitor shelf was passed through first a catalytic pre-curing oven at a temperature of 350-380°C for a period of 1 minute 2 seconds and then through a conventional curing oven at 145°C for a period of 7 minutes 14 seconds.
- the resulting powder coverage of the shelf was very poor (thin) and great difficulty was experienced in applying the powder.
- a similar MDF monitor shelf was powder coated using an identical method to Example 1 but with the addition of an initial preheating step in which, prior to powder coating, the monitor shelf was conveyed through a conventional preheat oven running at a temperature of 160°C within which the board remained for a period of 3 minutes 11 seconds and then through a catalytic preheat oven running at a temperature of 450°C within which the board remained for a period of 31 seconds.
- excellent coverage of the monitor shelf was obtained, and the powder was applied easily during the powder coating process.
- the use of a jig 32 with a PTFE sleeve 26 as shown in Figure 4 for suspending the monitor shelf from the conveying line also ensured that no halo was visible on the coated product.
- a similar MDF monitor shelf was subjected to powder coating using an identical powder coating method to that of Example 2 except that the shelf was initially completely dried out by placing it in a conventional curing oven for 3 hours at a temperature of 190°C.
- the subsequent processing steps resulted in virtually no coverage of the board by the powder coating due to the fact that substantially all the moisture had been extracted from the board.
- the powder particles were observed to simply bounce of the shelf during the coating process.
- very slight coverage of the board took place on the opposite side of the board to the jigging point due to the presence of the conductive jig 32.
- the method of the invention may also be applied to coating of a previously painted surface in which case the powder coating is effected at a similar voltage to the methods described above for coating of an unpainted surface, and static burn can be substantially eliminated.
- the powder coating is effected at a similar voltage to the methods described above for coating of an unpainted surface, and static burn can be substantially eliminated.
- the coated edge may still be prone to chipping, and it is therefore preferable to provide profiled edges of at least 3mm radius where possible.
- the temperature to which the boards are preheated may be varied such that each board is coated with powder within a temperature range of about 40°C to 100°C, preferably within a range of 50°C to 70°C.
- the temperature to which the boards are heated within the stoving oven may be varied within a range of 100°C to 160°C, depending on the curing temperature of the particular powder used.
- the initial preheating or subsequent stoving of the boards preheating or subsequent stoving of the boards to be effected in the same area as that in which the powder is applied to the boards, provided that the heat applied is controlled between each successive step of the process.
- the powder coating is supplied by two or more guns which are automatically moved over the surfaces of the board as the board passes through the powder coating booth, it is also possible for the powder coating to be applied by one or more manually operated guns.
- a manually operated gun may be used at the outlet of the booth to remedy any defects in the coating applied by automatically controlled guns.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9801897 | 1998-01-30 | ||
GBGB9801897.1A GB9801897D0 (en) | 1998-01-30 | 1998-01-30 | Powder coating of board |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0933140A1 true EP0933140A1 (fr) | 1999-08-04 |
Family
ID=10826100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99300655A Withdrawn EP0933140A1 (fr) | 1998-01-30 | 1999-01-28 | Procédé pour le revêtement des objets à base de bois avec des revêtements en poudre |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0933140A1 (fr) |
GB (2) | GB9801897D0 (fr) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6268022B1 (en) * | 1999-09-03 | 2001-07-31 | Morton International, Inc. | Process for coating cabinet doors |
WO2001068265A1 (fr) * | 2000-03-10 | 2001-09-20 | Action Caps, Llc. | Intermediaires jetables ou recyclables a utiliser dans les installations d'enrobage electrostatique |
US6319562B1 (en) * | 1995-08-10 | 2001-11-20 | Triline Ab | Method for powder coating the surface of heat sensitive objects |
US6458250B1 (en) | 2000-10-26 | 2002-10-01 | E. I. Du Pont De Nemours And Company | Process for the application of powder coatings to non-metallic substrates |
EP1252938A2 (fr) * | 2001-04-18 | 2002-10-30 | Rohm And Haas Company | Prétraitement différentiel des substrats avant un revêtement en poudre |
ES2182715A1 (es) * | 2001-07-24 | 2003-03-01 | Latorre Jesus Francis Barberan | Maquina automatica para el barnizado de piezas planas de madera, mdf, o aglomerado, con polvo ultravioleta. |
US6537671B2 (en) | 2000-12-05 | 2003-03-25 | Alpha Coating Technologies, Llc | Coating powders having enhanced electrostatic chargeability |
EP1317968A2 (fr) * | 2001-12-04 | 2003-06-11 | Rohm And Haas Company | Procédé pour réduire les défauts d'un revêtement en poudre |
ES2216697A1 (es) * | 2003-02-06 | 2004-10-16 | Enebe, S.L. | Procedimiento de pintado de tablero de aglomerado para tenis de mesa, y tablero obtenido por dicho procedimiento. |
US6890604B2 (en) * | 2002-05-13 | 2005-05-10 | Trio Industries Holdings, Llc | Method and system for powder coating passage doors |
US7090897B2 (en) * | 2003-10-10 | 2006-08-15 | Hardesty Jon H | Electrically conductive MDF surface |
US7223477B2 (en) | 2000-12-05 | 2007-05-29 | Alpha Coating Technologies, Llc | Coating powders having enhanced flexability |
WO2009077050A1 (fr) * | 2007-12-18 | 2009-06-25 | Wd Beteiligungs Gmbh | Procédé et dispositif de revêtement de substrats de bois par des poudres |
CN104492670A (zh) * | 2014-12-31 | 2015-04-08 | 山东朗法博粉末涂装科技有限公司 | 中纤板粉末喷涂工艺 |
CN104511383A (zh) * | 2015-01-14 | 2015-04-15 | 福建省雅康工贸有限公司 | 一种竹制品静电喷涂装置及其喷涂工艺 |
WO2022243125A1 (fr) * | 2021-05-18 | 2022-11-24 | Akzo Nobel Coatings International B.V. | Procédé et installation de revêtement en poudre |
CN116871136A (zh) * | 2023-08-14 | 2023-10-13 | 阜阳大可新材料股份有限公司 | 一种粉末涂料涂装高密度纤维板的生产方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114589075B (zh) * | 2022-01-20 | 2023-10-03 | 杭州吉众机电股份有限公司 | 一种产品表面喷涂处理工艺 |
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US2730988A (en) * | 1950-06-10 | 1956-01-17 | Ransburg Electro Coating Corp | Electrostatic coating apparatus |
FR1220652A (fr) * | 1958-04-19 | 1960-05-27 | Dunlop Sa | Perfectionnements aux appareils pour le revêtement électrostatique d'objets |
JPS51101043A (ja) * | 1975-03-03 | 1976-09-07 | Nippon Paint Co Ltd | Funtaitosohoho |
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JPS61252154A (ja) * | 1985-05-01 | 1986-11-10 | 東燃化学株式会社 | 樹脂被覆木質板の製造 |
DE3631747A1 (de) * | 1986-09-18 | 1988-03-31 | Johann Nikolaus Feld | Haken fuer elektrostatische durchlauf-lackier- oder beschichtungsanlagen |
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US5344672A (en) * | 1992-05-14 | 1994-09-06 | Sanderson Plumbing Products, Inc. | Process for producing powder coated plastic product |
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DE19622921A1 (de) * | 1996-06-07 | 1997-12-11 | Basf Lacke & Farben | Mit Pulverlack beschichteter wärmeempfindlicher Werkstoff |
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-
1998
- 1998-01-30 GB GBGB9801897.1A patent/GB9801897D0/en not_active Ceased
-
1999
- 1999-01-28 EP EP99300655A patent/EP0933140A1/fr not_active Withdrawn
- 1999-01-29 GB GB9901864A patent/GB2333725B/en not_active Expired - Lifetime
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FR1220652A (fr) * | 1958-04-19 | 1960-05-27 | Dunlop Sa | Perfectionnements aux appareils pour le revêtement électrostatique d'objets |
JPS51101043A (ja) * | 1975-03-03 | 1976-09-07 | Nippon Paint Co Ltd | Funtaitosohoho |
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DE3631747A1 (de) * | 1986-09-18 | 1988-03-31 | Johann Nikolaus Feld | Haken fuer elektrostatische durchlauf-lackier- oder beschichtungsanlagen |
US5081952A (en) * | 1990-10-05 | 1992-01-21 | Caterpillar Inc. | Paint fixture for supporting article during electrostatic spraying |
US5344672A (en) * | 1992-05-14 | 1994-09-06 | Sanderson Plumbing Products, Inc. | Process for producing powder coated plastic product |
DE19533858A1 (de) * | 1995-09-13 | 1997-07-03 | Ihd Inst Fuer Holztechnologie | Verfahren zum elektrostatischen Beschichten von Holz und Holzwerkstoffen |
DE19622921A1 (de) * | 1996-06-07 | 1997-12-11 | Basf Lacke & Farben | Mit Pulverlack beschichteter wärmeempfindlicher Werkstoff |
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DATABASE WPI Section Ch Week 8651, Derwent World Patents Index; Class A18, AN 86-336126, XP002104526 * |
DATABASE WPI Section Ch Week 8651, Derwent World Patents Index; Class A18, AN 86-336127, XP002104527 * |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6592665B2 (en) | 1995-08-10 | 2003-07-15 | Triline Ab | Method and apparatus for powder coating |
US6319562B1 (en) * | 1995-08-10 | 2001-11-20 | Triline Ab | Method for powder coating the surface of heat sensitive objects |
US6268022B1 (en) * | 1999-09-03 | 2001-07-31 | Morton International, Inc. | Process for coating cabinet doors |
US6325899B1 (en) | 2000-03-10 | 2001-12-04 | Action Caps, Llc | Disposable and recyclable intermediates for use in electrostatic coating processes |
US6579369B2 (en) | 2000-03-10 | 2003-06-17 | Action Caps, Llc | Protective cap for use in electrostatic coating method |
WO2001068265A1 (fr) * | 2000-03-10 | 2001-09-20 | Action Caps, Llc. | Intermediaires jetables ou recyclables a utiliser dans les installations d'enrobage electrostatique |
US6607600B2 (en) | 2000-03-10 | 2003-08-19 | Action Caps Llc | Electrostatic coating apparatus and method |
US6673215B2 (en) | 2000-03-10 | 2004-01-06 | Action Caps Llc | Electrostatic coating method |
US6458250B1 (en) | 2000-10-26 | 2002-10-01 | E. I. Du Pont De Nemours And Company | Process for the application of powder coatings to non-metallic substrates |
US7223477B2 (en) | 2000-12-05 | 2007-05-29 | Alpha Coating Technologies, Llc | Coating powders having enhanced flexability |
US6537671B2 (en) | 2000-12-05 | 2003-03-25 | Alpha Coating Technologies, Llc | Coating powders having enhanced electrostatic chargeability |
EP1252938A2 (fr) * | 2001-04-18 | 2002-10-30 | Rohm And Haas Company | Prétraitement différentiel des substrats avant un revêtement en poudre |
US7442409B2 (en) | 2001-04-18 | 2008-10-28 | Rohm And Haas Company | Differential processing of powder coated substrates |
EP1252938A3 (fr) * | 2001-04-18 | 2003-11-26 | Rohm And Haas Company | Prétraitement différentiel des substrats avant un revêtement en poudre |
ES2182715A1 (es) * | 2001-07-24 | 2003-03-01 | Latorre Jesus Francis Barberan | Maquina automatica para el barnizado de piezas planas de madera, mdf, o aglomerado, con polvo ultravioleta. |
US6797322B2 (en) * | 2001-12-04 | 2004-09-28 | Rohm And Haas Company | Method of reducing surface defects in a powder coated surface |
EP1317968A3 (fr) * | 2001-12-04 | 2004-07-21 | Rohm And Haas Company | Procédé pour réduire les défauts d'un revêtement en poudre |
EP1317968A2 (fr) * | 2001-12-04 | 2003-06-11 | Rohm And Haas Company | Procédé pour réduire les défauts d'un revêtement en poudre |
US6890604B2 (en) * | 2002-05-13 | 2005-05-10 | Trio Industries Holdings, Llc | Method and system for powder coating passage doors |
ES2216697A1 (es) * | 2003-02-06 | 2004-10-16 | Enebe, S.L. | Procedimiento de pintado de tablero de aglomerado para tenis de mesa, y tablero obtenido por dicho procedimiento. |
US7090897B2 (en) * | 2003-10-10 | 2006-08-15 | Hardesty Jon H | Electrically conductive MDF surface |
WO2009077050A1 (fr) * | 2007-12-18 | 2009-06-25 | Wd Beteiligungs Gmbh | Procédé et dispositif de revêtement de substrats de bois par des poudres |
CN104492670A (zh) * | 2014-12-31 | 2015-04-08 | 山东朗法博粉末涂装科技有限公司 | 中纤板粉末喷涂工艺 |
CN104511383A (zh) * | 2015-01-14 | 2015-04-15 | 福建省雅康工贸有限公司 | 一种竹制品静电喷涂装置及其喷涂工艺 |
WO2022243125A1 (fr) * | 2021-05-18 | 2022-11-24 | Akzo Nobel Coatings International B.V. | Procédé et installation de revêtement en poudre |
CN116871136A (zh) * | 2023-08-14 | 2023-10-13 | 阜阳大可新材料股份有限公司 | 一种粉末涂料涂装高密度纤维板的生产方法 |
Also Published As
Publication number | Publication date |
---|---|
GB9801897D0 (en) | 1998-03-25 |
GB2333725A (en) | 1999-08-04 |
GB9901864D0 (en) | 1999-03-17 |
GB2333725B (en) | 2001-06-27 |
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