EP1123749B1 - Electrostatic powder coating installation - Google Patents

Electrostatic powder coating installation Download PDF

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Publication number
EP1123749B1
EP1123749B1 EP00810747A EP00810747A EP1123749B1 EP 1123749 B1 EP1123749 B1 EP 1123749B1 EP 00810747 A EP00810747 A EP 00810747A EP 00810747 A EP00810747 A EP 00810747A EP 1123749 B1 EP1123749 B1 EP 1123749B1
Authority
EP
European Patent Office
Prior art keywords
floor plate
slots
extraction
exhaust air
powder coating
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 - Lifetime
Application number
EP00810747A
Other languages
German (de)
French (fr)
Other versions
EP1123749A1 (en
Inventor
Jahn Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordson Corp
Original Assignee
Nordson Corp
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
Priority claimed from EP00810109A external-priority patent/EP1123748A1/en
Application filed by Nordson Corp filed Critical Nordson Corp
Priority to EP00810747A priority Critical patent/EP1123749B1/en
Publication of EP1123749A1 publication Critical patent/EP1123749A1/en
Priority to US09/933,936 priority patent/US6730169B2/en
Application granted granted Critical
Publication of EP1123749B1 publication Critical patent/EP1123749B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • B05B16/25—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations for both automatic and manual spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/40—Construction elements specially adapted therefor, e.g. floors, walls or ceilings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/60—Ventilation arrangements specially adapted therefor

Definitions

  • the present invention relates to an electrostatic powder coating apparatus.
  • Such a powder coating system is for example from the EP-B-0 200 681 known. While the shape of this known cabin has greatly improved the collection and suction of powder residues in relation to the prior art, in the course of creating such installations, there has been a need to improve both the accessibility of such cabins and the efficiency of powder recycling continue to increase.
  • a coating system according to the preamble of claim 1 is known, fall in the powder residues by gratings over two channels in each case a larger channel.
  • a gully cover which is hinged to a hinge.
  • the suction device In the electrostatic powder coating system according to Figures 1-3 one recognizes the cabin 1, the suction device with the suction tube 2, which opens into the cyclone 3, and connected to the cyclone powder container 4, from which the powder passes through a powder line 7 to the automatic spray guns 5 or to the handsets 6.
  • the suction device In professional circles, the suction device, since it contains filters, also called absolute filter or postfilter.
  • the cabin 1 can, as according to the European patent mentioned above, consist of electrically non-conductive material and have the same or similar cleaning system, as described in this patent.
  • the coating organs such as automatic or manually operated spray guns, are assumed to be known, which also applies to the suction tube, the cyclone and the powder container with the powder feed and the line 7 between cyclone and powder container applies.
  • Fig. 1 can be seen also narrower and wider bushings 8 and openings 9, the narrower passages 8 are provided for the automatic spraying devices, which are arranged on a working platform, and the larger openings 9 for a manual pre resp.
  • Post-processing are provided by means of a hand-operated spray gun.
  • the end faces 10 and 11 of the cabin can, as according to the cited patent, be designed as a two-leaf doors having an opening.
  • the cabin may also have only passages for the workpieces, i. the cabin can be made without moving parts such as gates.
  • the cabin has a V-shaped lower part 12, to which the collecting channel 13 adjoins downward, which has a rectangular cross-section in this embodiment.
  • the channel bottom 14 rises obliquely from the connection 15 of the suction tube to the front, resulting in a uniform suction power over the entire length of the cabin.
  • the suction channel seen from above, has a variable width, wherein the channel widened from the suction tube extends forward, but this version has not been proven.
  • Fig. 5 It can be seen that the collecting channel 13 is closed at the front by a plate 23 and also that the clear height of the collecting channel front is much lower than when connecting the suction tube, see Fig. 4 ,
  • the collecting channel 13 is closed by longitudinally supported on brackets 16 bottom plates, as shown in the Fig. 1 and 2 is apparent.
  • the bottom plate 17 is shown in a view from above and in section.
  • This bottom plate is made of a suitable, electrically non-conductive plastic material and has, for example, a length of 1200 mm, a width of 500 mm and a thickness of 20 mm.
  • the floor panels may have other dimensions and be made of a different material.
  • the walk-in floor panels are designed so stable that they are able to carry the weight of an operator, the specified dimensions meet this condition readily.
  • a bottom plate has slots 18 on both longitudinal sides, intermediate slots 19 on both transverse sides, and additional transverse slots 20 in the interior of the base plate.
  • the transverse slots 20 are not uniformly distributed over the plate, or on the various plates, but they occur frequently at the points 5 of the automatic spray guns and less frequently at the points 6 of manual processing.
  • the longitudinal slots 18 play a greater role than the transverse slots 19 and 20, which can also be arranged obliquely to the longitudinal axis.
  • the transverse or slanted slots can be through a few openings or optionally be replaced by an opening in a plate, or each in a plurality of plates.
  • the total opening area of the slots results in a flow velocity of the exhaust air produced by the post-filter, which allows maximum powder recycling.
  • a desired flow velocity of 16 m / s and an exhaust air volume of 4,444 m 3 / s results in a total opening area for the slots of 0.278 m 2 .
  • Such an arrangement of the suction slots in a bottom plate and the arrangement of the bottom plates according to the Fig. 1 and 2 enable a homogeneous, uniform and optimal extraction of the powder residues over the entire length of the cabin during operation, and this with high suction power.
  • Fig. 4 possible to set the bottom plate perpendicular and hold in the holding part 21 of the holder 16 in a vertical position, or possibly remove completely. In the folded down state it lies on the support member 22. It is also possible to attach hinges at the location of the holding part.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Description

Die vorliegende Erfindung bezieht sich auf eine elektrostatische Pulverbeschichtungsanlage.The present invention relates to an electrostatic powder coating apparatus.

Eine solche Pulverbeschichtungsanlage ist beispielsweise aus der EP-B-0 200 681 bekannt. Während die Form dieser bekannten Kabine das Einsammeln und Absaugen der Pulverrückstände in Bezug auf den damaligen Stand der Technik beträchtlich verbessert hat, hat sich im Verlauf des Erstellens von solchen Anlagen das Bedürfnis ergeben, sowohl die Begehbarkeit solcher Kabinen zu verbessern als auch den Wirkungsgrad der Pulverrückführung weiter zu erhöhen.Such a powder coating system is for example from the EP-B-0 200 681 known. While the shape of this known cabin has greatly improved the collection and suction of powder residues in relation to the prior art, in the course of creating such installations, there has been a need to improve both the accessibility of such cabins and the efficiency of powder recycling continue to increase.

Aus der US-A-6 010 571 ist eine Beschichtungsanlage gemäss Oberbegriff von Patentanspruch 1 bekannt, bei der Pulverrückstände durch Gitterroste über zwei Kanäle in je einen grösseren Kanal fallen. Aus der GB-A-2 120 303 ist eine Gully-Abdeckung bekannt, die an einem Scharnier angelenkt ist.From the US-A-6 010 571 a coating system according to the preamble of claim 1 is known, fall in the powder residues by gratings over two channels in each case a larger channel. From the GB-A-2 120 303 is known a gully cover, which is hinged to a hinge.

Es ist gegenüber diesem bekannten Stand der Technik Aufgabe der vorliegenden Erfindung, die Begehbarkeit von Kabinen der eingangs genannten Art zu verbessern und den Wirkungsgrad der Pulverrückführung zu erhöhen. Diese Aufgabe wird mit einer elektrostatischen Pulverbeschichtungsanlage gemäss Patentanspruch 1 gelöst.It is compared to this known prior art object of the present invention to improve the accessibility of cabins of the type mentioned and to increase the efficiency of powder recycling. This object is achieved with an electrostatic powder coating system according to claim 1.

Die Erfindung wird im folgenden anhand von Zeichnungen eines Ausführungsbeispiels näher erläutert:

Figur 1
zeigt schematisch und in einem Längsschnitt eine erfindungsgemässe Pulverbeschichtungsanlage,
Figur 2
zeigt die Anlage von Figur 1 von oben im Schnitt,
Figur 3
zeigt einen Schnitt gemäss der Linie III-III in Figur 2,
Figur 4
zeigt einen Schnitt gemäss der Linie IV-IV in Figur 1 in vergrössertem Massstab,
Figur 5
zeigt einen Schnitt gemäss der Linie V-V in Figur 1 in vergrössertem Massstab,
Figur 6
zeigt eine Bodenplatte der Anlage von Figur 1 in Draufsicht, und
Figur 6A
zeigt einen Schnitt gemäss der Linie VI-VI in Figur 6.
The invention is explained in more detail below with reference to drawings of an embodiment:
FIG. 1
shows schematically and in a longitudinal section an inventive powder coating system,
FIG. 2
shows the plant of FIG. 1 in section from above,
FIG. 3
shows a section along the line III-III in FIG. 2 .
FIG. 4
shows a section along the line IV-IV in FIG. 1 on an enlarged scale,
FIG. 5
shows a section along the line VV in FIG. 1 on an enlarged scale,
FIG. 6
shows a bottom plate of the plant of FIG. 1 in plan view, and
FIG. 6A
shows a section along the line VI-VI in FIG. 6 ,

In der elektrostatischen Pulverbeschichtungsanlage gemäss den Figuren 1-3 erkennt man die Kabine 1, die Absaugeinrichtung mit dem Absaugrohr 2, das in den Zyklon 3 mündet, sowie den mit dem Zyklon verbundenen Pulverbehälter 4, von dem das Pulver über eine Pulverleitung 7 zu den automatischen Spritzpistolen 5 oder zu den Handgeräten 6 gelangt. In Fachkreisen wird die Absaugeinrichtung, da sie Filter enthält, auch Absolutfilter oder Nachfilter genannt.In the electrostatic powder coating system according to Figures 1-3 one recognizes the cabin 1, the suction device with the suction tube 2, which opens into the cyclone 3, and connected to the cyclone powder container 4, from which the powder passes through a powder line 7 to the automatic spray guns 5 or to the handsets 6. In professional circles, the suction device, since it contains filters, also called absolute filter or postfilter.

Die Kabine 1 kann, wie gemäss der eingangs erwähnten europäischen Patentschrift, aus elektrisch nichtleitendem Material bestehen und eine gleiche oder ähnliche Reinigungsanlage aufweisen, wie in dieser Patentschrift beschrieben. Die Beschichtungsorgane, wie automatische oder handbetriebene Spritzpistolen, werden als bekannt vorausgesetzt, was auch auf das Absaugrohr, den Zyklon sowie den Pulverbehälter mit der Pulverzuführung und die Leitung 7 zwischen Zyklon und Pulverbehälter zutrifft. Im Schnitt von Fig. 1 erkennt man ferner schmälere und breitere Durchführungen 8 und Öffnungen 9, wobei die schmäleren Durchführungen 8 für die automatischen Sprühvorrichtungen, die auf einer Arbeitsbühne angeordnet sind, vorgesehen sind und die grösseren Öffnungen 9 für eine manuelle Vor- resp. Nachbearbeitung mittels einer handbetriebenen Spritzpistole vorgesehen sind.The cabin 1 can, as according to the European patent mentioned above, consist of electrically non-conductive material and have the same or similar cleaning system, as described in this patent. The coating organs, such as automatic or manually operated spray guns, are assumed to be known, which also applies to the suction tube, the cyclone and the powder container with the powder feed and the line 7 between cyclone and powder container applies. On average of Fig. 1 can be seen also narrower and wider bushings 8 and openings 9, the narrower passages 8 are provided for the automatic spraying devices, which are arranged on a working platform, and the larger openings 9 for a manual pre resp. Post-processing are provided by means of a hand-operated spray gun.

Die Stirnseiten 10 und 11 der Kabine können, wie gemäss eingangs zitierter Patentschrift, als zweiflüglige Tore ausgebildet sein, die eine Öffnung aufweisen. Die Kabine kann jedoch auch nur Durchlässe für die Werkstücke aufweisen, d.h. die Kabine kann ohne bewegliche Teile wie Tore hergestellt sein.The end faces 10 and 11 of the cabin can, as according to the cited patent, be designed as a two-leaf doors having an opening. However, the cabin may also have only passages for the workpieces, i. the cabin can be made without moving parts such as gates.

Gemäss Fig. 3 besitzt die Kabine ein V-förmiges Unterteil 12, an das sich nach unten der Sammelkanal 13 anschliesst, der in diesem Ausführungsbeispiel einen rechteckförmigen Querschnitt aufweist. Wie aus dem Längsschnitt von Fig. 1 hervorgeht, steigt der Kanalboden 14 vom Anschluss 15 des Absaugrohres bis nach vorne schräg an, so dass sich dadurch eine gleichmässige Absaugleistung auf der ganzen Kabinenlänge ergibt. In der eingangs erwähnten europäischen Patentschrift wurde dies dadurch versucht, dass der Absaugkanal, von oben gesehen, eine veränderliche Breite aufweist, wobei sich der Kanal vom Absaugrohr aus gesehen nach vorne verbreitert, doch hat sich diese Ausführung nicht bewährt. In Fig. 5 ist ersichtlich, dass der Sammelkanal 13 vorne durch eine Platte 23 abgeschlossen ist und zudem, dass die lichte Höhe des Sammelkanals vorne wesentlich geringer ist als beim Anschluss des Saugrohres, siehe Fig. 4.According to Fig. 3 the cabin has a V-shaped lower part 12, to which the collecting channel 13 adjoins downward, which has a rectangular cross-section in this embodiment. As seen from the longitudinal section of Fig. 1 As can be seen, the channel bottom 14 rises obliquely from the connection 15 of the suction tube to the front, resulting in a uniform suction power over the entire length of the cabin. In the European patent mentioned above, this was attempted by the fact that the suction channel, seen from above, has a variable width, wherein the channel widened from the suction tube extends forward, but this version has not been proven. In Fig. 5 It can be seen that the collecting channel 13 is closed at the front by a plate 23 and also that the clear height of the collecting channel front is much lower than when connecting the suction tube, see Fig. 4 ,

Der Sammelkanal 13 wird durch längs auf Halterungen 16 abgestützte Bodenplatten abgeschlossen, wie dies aus den Fig. 1 und 2 ersichtlich ist. In den Fig. 6 und 6A ist die Bodenplatte 17 in einer Sicht von oben und im Schnitt dargestellt. Diese Bodenplatte ist aus einem geeigneten, elektrisch nichtleitenden Kunststoffmaterial hergestellt und weist beispielsweise eine Länge von 1200 mm, eine Breite von 500 mm und eine Dicke von 20 mm auf. Je nach Anlage können die Bodenplatten auch andere Dimensionen aufweisen und aus einem anderen Material hergestellt sein. Die begehbaren Bodenplatten sind so stabil ausgelegt, dass sie das Gewicht einer Bedienungsperson zu tragen vermögen, wobei die angegebenen Dimensionen diese Bedingung ohne weiteres erfüllen.The collecting channel 13 is closed by longitudinally supported on brackets 16 bottom plates, as shown in the Fig. 1 and 2 is apparent. In the FIGS. 6 and 6A the bottom plate 17 is shown in a view from above and in section. This bottom plate is made of a suitable, electrically non-conductive plastic material and has, for example, a length of 1200 mm, a width of 500 mm and a thickness of 20 mm. Depending on the system, the floor panels may have other dimensions and be made of a different material. The walk-in floor panels are designed so stable that they are able to carry the weight of an operator, the specified dimensions meet this condition readily.

Um eine maximale Absaugung der Pulverrückstände zu gewährleisten, die nicht gleichmässig über den ganzen Kabinenboden verteilt, sondern massiert an den Orten der automatischen Sprühpistolen und weniger konzentriert an den Stellen der manuellen Vor- oder Nachbehandlung anfallen, sind verschiedene Schlitze und Schlitzanordnungen in der Bodenplatte, bzw. in den Bodenplatten angebracht. So weist eine Bodenplatte an beiden Längsseiten Schlitze 18, an beiden Querseiten Zwischenschlitze 19 sowie im Innern der Bodenplatte zusätzliche, quergerichtete Schlitze 20 auf. Die quergerichteten Schlitze 20 sind nicht gleichmässig über die Platte, bzw. über die verschiedenen Platten verteilt, sondern sie treten gehäuft an den Stellen 5 der automatischen Spritzpistolen und weniger gehäuft an den Stellen 6 der manuellen Bearbeitung auf.In order to ensure a maximum extraction of powder residues, which are not uniformly distributed over the entire cabin floor, but massaged in the places of the automatic spray guns and concentrated less concentrated at the points of manual pre- or post-treatment, various slots and slot arrangements in the bottom plate, or . mounted in the floor panels. Thus, a bottom plate has slots 18 on both longitudinal sides, intermediate slots 19 on both transverse sides, and additional transverse slots 20 in the interior of the base plate. The transverse slots 20 are not uniformly distributed over the plate, or on the various plates, but they occur frequently at the points 5 of the automatic spray guns and less frequently at the points 6 of manual processing.

Dabei spielen für die homogene Absaugung über die ganze Kabinenlänge die längsgerichteten Schlitze 18 eine grössere Rolle als die quergerichteten Schlitze 19 und 20, die auch schräg zur Längsachse angeordnet sein können. Ausserdem, besonders bei kleineren Kabinen, können die quergerichteten, bzw. schäggerichteten Schlitze durch wenige Öffnungen oder gegebenenfalls durch eine Öffnung in einer Platte, bzw. je in mehreren Platten, ersetzt werden.In this case, for the homogeneous suction over the entire length of the cabin, the longitudinal slots 18 play a greater role than the transverse slots 19 and 20, which can also be arranged obliquely to the longitudinal axis. In addition, especially in smaller cabins, the transverse or slanted slots can be through a few openings or optionally be replaced by an opening in a plate, or each in a plurality of plates.

Bei der Auslegung der Schlitze, bzw. von deren Häufigkeit und Öffnungsbreite, ist es von Vorteil sie so auszulegen, dass die Gesamtöffnungsfläche der Schlitze eine Anströmgeschwindigkeit der vom Nachfilter erzeugten Abluftmenge ergibt, die eine maximale Pulverrückführung ermöglicht. Bei einer erwünschten Anströmgeschwindigkeit von 16 m/s und einer Abluftmenge von 4.444 m3/s ergibt sich eine Gesamtöffnungsfläche für die Schlitze von 0.278 m2. Das heisst, dass in einer vereinfachten Berechnung die Abluftmenge in m3/s, geteilt durch die erwünschte, optimale Anströmgeschwindigkeit in m/s die gewünschte Gesamtfläche der Schlitze eines Steges ergibt.In the design of the slots, and their frequency and opening width, it is advantageous to interpret them so that the total opening area of the slots results in a flow velocity of the exhaust air produced by the post-filter, which allows maximum powder recycling. With a desired flow velocity of 16 m / s and an exhaust air volume of 4,444 m 3 / s results in a total opening area for the slots of 0.278 m 2 . This means that, in a simplified calculation, the amount of exhaust air in m 3 / s, divided by the desired, optimum flow velocity in m / s, results in the desired total area of the slots of a web.

Eine solche Anordnung der Absaugschlitze in einer Bodenplatte und die Anordnung der Bodenplatten gemäss den Fig. 1 und 2 ermöglichen eine homogene, gleichmässige und optimale Absaugung der Pulverrückstände über die ganze Kabinenlänge im Betrieb, und dies bei hoher Absaugleistung.Such an arrangement of the suction slots in a bottom plate and the arrangement of the bottom plates according to the Fig. 1 and 2 enable a homogeneous, uniform and optimal extraction of the powder residues over the entire length of the cabin during operation, and this with high suction power.

Für die Reinigung des Sammelkanals ist es erforderlich, die Bodenplatten zu entfernen. Dabei ist es gemäss Fig. 4 möglich, die Bodenplatte senkrecht zu stellen und im Halteteil 21 der Halterung 16 in senkrechter Position festzuhalten, oder gegebenenfalls ganz herauszunehmen. Im herabgeklappten Zustand liegt sie auf dem Stützteil 22 auf. Es ist auch möglich, an der Stelle des Halteteils Scharniere anzubringen.For the cleaning of the collecting channel, it is necessary to remove the bottom plates. It is according to Fig. 4 possible to set the bottom plate perpendicular and hold in the holding part 21 of the holder 16 in a vertical position, or possibly remove completely. In the folded down state it lies on the support member 22. It is also possible to attach hinges at the location of the holding part.

Claims (5)

  1. Electrostatic powder coating system with a booth, with a lower portion and at the bottom a collection channel (13) connected to an extraction device (2) and which is provided with two ends, each of which is provided with a passage for the workpieces, the collecting channel (13) being covered by at least one walkable floor plate (17), the floor plate being provided with at least one extraction opening arranged in the interior of the floor plate or an extraction slot (20), characterised in that the lower portion of the booth is V-shaped, in that the floor plate (17) is provided with extraction slots (18) arranged at least on both long sides, and in that the floor plate (17) can be swung up and fixed in this position.
  2. System according to claim 1, characterised in that the total surface area of the slots and openings in the floor plate(s) (17) is a function of the approach velocity of the exhaust air and the quantity of exhaust air, the quantity of exhaust air (m3/s) divided by the approach velocity (m/s) giving the total opening surface area (m2).
  3. System according to claim 1 or claim 2, characterised in that the floor plate(s) may be taken out, swung up and fixed in any position.
  4. System according to any one of claims 1 to 3, characterised in that the floor plate(s) (17) is(are) provided on both long sides with longitudinally directed extraction slots (18), on both transverse sides with transversely directed intermediate slots (19) and comprise(s) further transversely or obliquely directed extraction slots (20), which are arranged more or less densely in accordance with the locations with different incident powder quantities.
  5. System according to any one of claims 1 to 4, characterised in that, when viewed in longitudinal section, the collecting channel floor (14) has a height which decreases viewed from the point of connection (15) of the extraction pipe (2).
EP00810747A 2000-02-09 2000-08-22 Electrostatic powder coating installation Expired - Lifetime EP1123749B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00810747A EP1123749B1 (en) 2000-02-09 2000-08-22 Electrostatic powder coating installation
US09/933,936 US6730169B2 (en) 2000-08-22 2001-08-21 Electrostatic power coating system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP00810109A EP1123748A1 (en) 2000-02-09 2000-02-09 Electrostatic powder coating installation
EP00810109 2000-02-09
EP00810747A EP1123749B1 (en) 2000-02-09 2000-08-22 Electrostatic powder coating installation

Publications (2)

Publication Number Publication Date
EP1123749A1 EP1123749A1 (en) 2001-08-16
EP1123749B1 true EP1123749B1 (en) 2008-05-14

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EP00810747A Expired - Lifetime EP1123749B1 (en) 2000-02-09 2000-08-22 Electrostatic powder coating installation

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120303A (en) 1982-03-09 1983-11-30 Brickhouse Dudley Mfg Road surface access covers and gratings
DE3523423C1 (en) * 1984-08-02 1987-01-02 Passavant Werke Road gully
CH668008A5 (en) 1985-04-30 1988-11-30 H U Ramseier Fa ELECTROSTATIC POWDER COATING SYSTEM.
US4770089A (en) * 1987-05-29 1988-09-13 Vinicombe Gerald K Temporary grate cover for paint spray booth areas
US5176570A (en) * 1991-06-20 1993-01-05 Loren Liedl Filtered cold air baseboard return
US5676753A (en) 1995-10-25 1997-10-14 Abb Flexible Automation Inc. Exhaust systems for powder spray booth

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