CA1296885C - Air filtering system for paint spray - Google Patents
Air filtering system for paint sprayInfo
- Publication number
- CA1296885C CA1296885C CA000582345A CA582345A CA1296885C CA 1296885 C CA1296885 C CA 1296885C CA 000582345 A CA000582345 A CA 000582345A CA 582345 A CA582345 A CA 582345A CA 1296885 C CA1296885 C CA 1296885C
- Authority
- CA
- Canada
- Prior art keywords
- filter
- spray
- arrestor
- panel
- wire
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/44—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using walls specially adapted for promoting separation of the excess material from the air, e.g. baffle plates
-
- 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
- B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
Landscapes
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
Abstract
ABSTRACT
A paint spraying system for mitigating over-spray comprises paint spray arrestor panels forming an exhaust wall for spray. Spray traps are located behind at least some of the arrestor panels. Each paint spray trap comprises a filter spaced from the arrestor panel by a duct. The filter may be supported on a wire frame work.
The combination of the arrestor panel, duct and filter allows for removal of spray by the panel, fall out of spray in the duct and removal of residual spray by the filter.
12247-3.app
A paint spraying system for mitigating over-spray comprises paint spray arrestor panels forming an exhaust wall for spray. Spray traps are located behind at least some of the arrestor panels. Each paint spray trap comprises a filter spaced from the arrestor panel by a duct. The filter may be supported on a wire frame work.
The combination of the arrestor panel, duct and filter allows for removal of spray by the panel, fall out of spray in the duct and removal of residual spray by the filter.
12247-3.app
Description
~LZ96885 This invention relates to improvements in paint spraying booths.
Paint spray booths are necessary to contain and control the paint spray used in spraying individual items. Usually the individual items may be suspended from a conveyor which passes through the paint spray booth allowing an operator to spray each item. A
considerable amount of spray is wasted as over-spray and must be removed by the booth filtering system ~o that it does not contaminate the atmosphere. There are varying regulations concerning the rate of removal of the spray and the degree of allowable contamination of the atmosphere. These regulations differ from country to country and from state to state.
Usually, one wall of the paint spray booth behind the object to be sprayed in the direction of spraying comprises impaction style filter panels or impingement style paint arrestor panels. Exhaust means are used to provide an air current through the paint spray booth and through the filter panels or arrestor panels to tend to exhaust paint spray from the booth via the panels. Any spray not entrapped by the panels may be undesirably vented to the outside atmosphere.
Various problems have been experienced in providing efficient units and in maintaining the efficiency. The question of maintaining the efficiency is particularly troublesome due to the fact that paint spray tends to build up on the filters and clog the filters. This creates an unacceptable working atmosphere for the workers.
~Z9688~;
Paint spray booths are necessary to contain and control the paint spray used in spraying individual items. Usually the individual items may be suspended from a conveyor which passes through the paint spray booth allowing an operator to spray each item. A
considerable amount of spray is wasted as over-spray and must be removed by the booth filtering system ~o that it does not contaminate the atmosphere. There are varying regulations concerning the rate of removal of the spray and the degree of allowable contamination of the atmosphere. These regulations differ from country to country and from state to state.
Usually, one wall of the paint spray booth behind the object to be sprayed in the direction of spraying comprises impaction style filter panels or impingement style paint arrestor panels. Exhaust means are used to provide an air current through the paint spray booth and through the filter panels or arrestor panels to tend to exhaust paint spray from the booth via the panels. Any spray not entrapped by the panels may be undesirably vented to the outside atmosphere.
Various problems have been experienced in providing efficient units and in maintaining the efficiency. The question of maintaining the efficiency is particularly troublesome due to the fact that paint spray tends to build up on the filters and clog the filters. This creates an unacceptable working atmosphere for the workers.
~Z9688~;
- 2 It has been found that generally optimum conditions enforce dimensions of the paint spraying booth within very narrow limits. Thus, it is found that the object to be sprayed should be located roughly three feet in front of the filter or arrestor wall and that any space behind the wall should be at least three feet to allow for even distribution of exhaust air.
It has also been found that paint impingement arrestor panels are often to be preferred over impaction style filter panels since paint arrestor panels comprising spaced vertical foraminous sheets are not so subject to clogging as are conventional filters. These paint arrestor panels present surfaces which are coated by over-spray and provide tortuous parts through which any residual over-spray must travel. Thus, the over-spray falls on various surfaces of the sheets allowing maximum opportunity to coat the sheets. There is also an opportunity for fall-out of paint spray. Such paint arrestor panels are described in U.S. patent No. 2,583,489 to Meyer issued January 22nd 1952, U.S. patent No.
It has also been found that paint impingement arrestor panels are often to be preferred over impaction style filter panels since paint arrestor panels comprising spaced vertical foraminous sheets are not so subject to clogging as are conventional filters. These paint arrestor panels present surfaces which are coated by over-spray and provide tortuous parts through which any residual over-spray must travel. Thus, the over-spray falls on various surfaces of the sheets allowing maximum opportunity to coat the sheets. There is also an opportunity for fall-out of paint spray. Such paint arrestor panels are described in U.S. patent No. 2,583,489 to Meyer issued January 22nd 1952, U.S. patent No.
3,744,222 to Delao issued July 10th 1973, and U.S. patent No. 4,321,064 to Vargo issued March 23rd 1982. These paint arrestors are especially useful in that they stay rigid even when wet and heavy with paint spray and hence do not tend to sag out of place. They are also regarded as at least as efficient as the more conventional filters which are used which must necessarily be of coarse pore size to mitigate clogging.
Conventional coarse impaction style filters have come under scrutiny in various jusisdictions as to their potential fire risks and additional problems have been encourtered in providing filters or arrestor panels which , , .
~2~688S
comply , with various regulations for example, in Canada it is necessary to comply with the Underwriters Laboratories and the Underwriters Laboratories of Canada Regulations andd with the regulations of the National Fire Protection Association, Handbook 33, and, in Ontario, with the Industrial Safety Branch regulations of the MInistry of Labour.
The conventional coarse impaction style filters are sometimes backed by finer filters. Thus U.S. patent No.
Conventional coarse impaction style filters have come under scrutiny in various jusisdictions as to their potential fire risks and additional problems have been encourtered in providing filters or arrestor panels which , , .
~2~688S
comply , with various regulations for example, in Canada it is necessary to comply with the Underwriters Laboratories and the Underwriters Laboratories of Canada Regulations andd with the regulations of the National Fire Protection Association, Handbook 33, and, in Ontario, with the Industrial Safety Branch regulations of the MInistry of Labour.
The conventional coarse impaction style filters are sometimes backed by finer filters. Thus U.S. patent No.
4,237,780 shows a coarse filter as a wall of a paint spraying booth with a space behind it and then a fine filter. In that case the -filters are made from wood chips which are later used for fuel. Such arrangements of wood chips are perhaps theoretically advantageous where wood chips are in plentiful supply and can be used for fuel, but for safety reasons may not be used at least in Canada a convenient quickly interchangable unit locatable in a wall framework and quickly interchangable when full is normally desirable. Attempts have been made to produce easily interchangeable units as for example in U.S. patent No. 2,730,033 to Mellor issued January 10th 1956, U.S. No. 4,009,012 to ~Ieffler issued February 22nd 1977, U.S. No. 4,113,454 to Cvacho issued September 12th 1978, and U.S. No. 4,493,718 to Schweizer issued January 15th 1985. Of these U.S. No. 2,730,033 discloses a coarse cheese cloth filter which may be changed frequently backed by a finer fiberglass filter which is not subject to so many changes. The space between these two filters is not a dead space for the fall-out of particles to the ground since all particles passing through the cheese cloth filter will fall onto the fiberglass filter and the various of safety regulations in regard to combustion must be considered at least in ."~,,, . . ~ . .
1296~35 relation to some of these previously suggested filters.
U.S. paten-t No. 4,113,454 discloses first and second vertical filters for the space therebetween but each of these filters comprise a panel the full size of the wall
1296~35 relation to some of these previously suggested filters.
U.S. paten-t No. 4,113,454 discloses first and second vertical filters for the space therebetween but each of these filters comprise a panel the full size of the wall
5 of the spray chamber. If the spray chamber is large, they will present difficulty when replacement was needed.
U.S. patent No. 4,009,012 discloses a wall having plural openings for the location of filter elements of the wall.
There is no particular discussion of a construction of 10 the filter elements but rather their fastenings into the framework. U.S. patent No. 4,493,718 is concerned with the desirability of making a conventional filter rigid by supporting it on a wire grid. The filter is supported on the grid by prongs projecting from the grid onto which 15 the filter secured. It may be possible that such a filter may sag on the prongs when it is heavy and wet with paint spray. If such sagging were extreme it might be possible that unfiltered spray would pass beyond the filter wall at least at the top edge thereof where 20 sagging has taken place.
An attempt has now been made to design filter units to make up a wall of a paint spray booth, which filter units are quickly and easily interchangable, and which mitigate clogging by paint spray and sagging or otherwise 25 deforming under weight of filtered materials.
Thus according to the invention is provided a system for mitigating over-spray during paint spraying, the system comprising a wall in front of which objects are paint sprayed, the wall having paint spray arrestor 30 panels interchangably located in a wall frame work, and exhaust means to provide an air current from front to rear through the arrestor panels;
, ...................................... .
a spray trap located behind each of at least some of the arrestor panels, the spray trap comprising:
a filter spaced from the arrestor panel by a duct, the cross section of which conforms to the periphery of an arrestor panel, and which, at one end, has means for attachment to the wall frame work and, at the other end, is closed by the filter.
The distance of the filter from the arrestor panel may be such as to allow some settling out of any over-spray which still remains in the air current passing through the arrestor panel.
It is desirable that the space behind the filter wall of a spray booth be as small as possible to save space resources for other purposes. However, in practice, it has been found that a distance of at least three feet is required to allow for settling out of any remaining over-spray. When a secondary filter according to the invention is provided, a suitable spacing of the secondary filter from the arrestor panel may be about six inches and this distance may be comprised within the three feet necessary behind the arrestor panel.
An embodiment of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 shows an illustrative view of a spray booth incorporating an embodiment of the present invention.
Figure 2 shows a section of a booth such as that of Figure 1, in use;
:.,., ,. ,~ , , ~;296~5 Figure 3 is an exploded view of a filter unit embodying the invention; and Figure 4 i8 a section of an arrestor panel.
A spray booth 10 includes a filter wall 12 including arrestor panels 14. Behind the filter wall 12 is a rear compartment 18. Objects 20 are conveyed in front of the wall 12 by means of' a conveyor 22. Exhaust vent 16 contains an exhaust fan 24 and draws air through the wall 12 from an inlet 26 which is shown in the roof of the spray booth but may, in fact, be anywhere suitable. The front wall of the spray booth is not shown, and there must, of course, be a door into the booth at any suitable point.
Each filter unit 1~ of the wall 12 is shown in exploded view in Figure,2'together with a fragment of the wall framework. The unit 14 consists of an arrestor panel 28 which may be of any suitable form but conventionally comprises vertical sheets of board with circular holes 30 therein. Suitably there are three spaced layers of board 33 having holes 30 offset in relation to holes 30 in the next adjacent board. Thus the over-spray under the influence of the exhaust fan 24 tends to travel in the direction of the arrows shown in Figure 4 tending to coat both rear and front interior surfaces of the arrestor panel. The arrestor panels are set in apertures of a wall frame work 34 of a size and shape to accept them. They may be secured by clips or may be of a sufficiently tight fit to stand freely in the apertures.
Behind each arrestor panel a spray trap 36 may be ~29~8~i secured to the wall frame 34. The spray trap 36 may comprise a short length of duct or tube having similar cross-section as the plane of the arrestor panel.
Suitably, a flange 38 extending outwardly from the 5 forward surface of the duct 36 may be used to connect the duct to the frame work. The rear of the duct 36 may be provided with an inwardly extending flange 40 which serves to retain filter 42 which is of the same peripheral dimensions and shape as the arrestor panel 28.
The filter 42 is suitably formed to mitigate any tendency to sag in the filter material. This may be achieved by utilizing a wire frame 44 to maintain the shape of the filter 42. The wire frame 44 may suitably comprise a peripheral frame with at least one 15 strengthening cross-wire in either of the vertical or horizontal directions. The actual filter material may comprise a front sheet of filter material and a rear sheet of filter material with the wire frame 44 sandwiched therebetween. The sheets of filter material may be 20 connected, for example, by sealers at the top and bottom edges so that the wire frame 44 may hold them in position agai.nst sagging. In particular the wire frame 44 holds the top edges from sagging below the top edge of the frame 44. Thus a gasket of filler material may be formed 25 around the edges of the frame 44 especially when the side edges of the sheets are also sealed about the grid. One of these sheets is suitably polyester material and the other sheet may be fiberglass material. However9 this is a matter of choice.
In operation, an operator 50 using a spray gun 52 may spray an object 20 being conveyed by the conveyor 22.
Over-spray will be conveyed by air current entering the ,j, . . .
~6E38~;
spray booth l0 at inlet 26 and being directed through the filter wall 12 under the influence of exhaust fan 24 in exhaust vent 16. The over-spray will first pass through the arrestor panels and will coat the front surface thereof and interior surfaces with wet paint spray.
Since the holes 30 of the arrestor panels are of an appreciable size, paint build-up on these panels can be considerable without clogging. However, as these panels are of board or other semi-rigid material, there is little tendency to sagging or breaking to damage the integrity of the paint arresting system.
When any over-spray which is not entrapped by the arrestor panel reaches the space within the duct 36, in front of the filter 42, there may be a tendency for wet or dry paint particles to settle out in this space. This will fall into the duct 36 and can later be removed. Any still remaining, paint contaminant will then pass into filter 42. The loading of spray into th;s filter 42 is quite slight in comparison with the total amount of over-spray initially produced. Even so, there may be somebuild-up in weight of entrapped spray in this filter.
Therefore, precautions are taken in the provision of the wire grid to maintain the shape of filter 42. Moreover, the edges of this filter 42 which are sealed or otherwise connected about the wire grid 44 which may act to firmly locate the filter 42 within the duct 36, flange 40 serving to support the filter 42 from the rear.
If there is any over-spray still remaining in the air current, after it has passed through arrestor panel 28, the space within duct 36 and filter 42, it may settle out in the remaining rear compartment 18 of the spray boothO
~owever it has been found from tests made on a primary ~%9~8~
_ 9 _ arrestor panel and a secondary filter trap according to the invention, the efficiency may be about 75% in the arrestor panel and more than 95% of the remaining spray.
Thus it may be calculated that when using a system embodying the invention, at a very high average density of over-spray generated while painting and calculated at 0.73 grains per cubic foot of exhaust air, the efficiency factors of the filters would provide a stack emission rate of less than 0.01 grains per cubic foot of exhaust air.
,, ,
U.S. patent No. 4,009,012 discloses a wall having plural openings for the location of filter elements of the wall.
There is no particular discussion of a construction of 10 the filter elements but rather their fastenings into the framework. U.S. patent No. 4,493,718 is concerned with the desirability of making a conventional filter rigid by supporting it on a wire grid. The filter is supported on the grid by prongs projecting from the grid onto which 15 the filter secured. It may be possible that such a filter may sag on the prongs when it is heavy and wet with paint spray. If such sagging were extreme it might be possible that unfiltered spray would pass beyond the filter wall at least at the top edge thereof where 20 sagging has taken place.
An attempt has now been made to design filter units to make up a wall of a paint spray booth, which filter units are quickly and easily interchangable, and which mitigate clogging by paint spray and sagging or otherwise 25 deforming under weight of filtered materials.
Thus according to the invention is provided a system for mitigating over-spray during paint spraying, the system comprising a wall in front of which objects are paint sprayed, the wall having paint spray arrestor 30 panels interchangably located in a wall frame work, and exhaust means to provide an air current from front to rear through the arrestor panels;
, ...................................... .
a spray trap located behind each of at least some of the arrestor panels, the spray trap comprising:
a filter spaced from the arrestor panel by a duct, the cross section of which conforms to the periphery of an arrestor panel, and which, at one end, has means for attachment to the wall frame work and, at the other end, is closed by the filter.
The distance of the filter from the arrestor panel may be such as to allow some settling out of any over-spray which still remains in the air current passing through the arrestor panel.
It is desirable that the space behind the filter wall of a spray booth be as small as possible to save space resources for other purposes. However, in practice, it has been found that a distance of at least three feet is required to allow for settling out of any remaining over-spray. When a secondary filter according to the invention is provided, a suitable spacing of the secondary filter from the arrestor panel may be about six inches and this distance may be comprised within the three feet necessary behind the arrestor panel.
An embodiment of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 shows an illustrative view of a spray booth incorporating an embodiment of the present invention.
Figure 2 shows a section of a booth such as that of Figure 1, in use;
:.,., ,. ,~ , , ~;296~5 Figure 3 is an exploded view of a filter unit embodying the invention; and Figure 4 i8 a section of an arrestor panel.
A spray booth 10 includes a filter wall 12 including arrestor panels 14. Behind the filter wall 12 is a rear compartment 18. Objects 20 are conveyed in front of the wall 12 by means of' a conveyor 22. Exhaust vent 16 contains an exhaust fan 24 and draws air through the wall 12 from an inlet 26 which is shown in the roof of the spray booth but may, in fact, be anywhere suitable. The front wall of the spray booth is not shown, and there must, of course, be a door into the booth at any suitable point.
Each filter unit 1~ of the wall 12 is shown in exploded view in Figure,2'together with a fragment of the wall framework. The unit 14 consists of an arrestor panel 28 which may be of any suitable form but conventionally comprises vertical sheets of board with circular holes 30 therein. Suitably there are three spaced layers of board 33 having holes 30 offset in relation to holes 30 in the next adjacent board. Thus the over-spray under the influence of the exhaust fan 24 tends to travel in the direction of the arrows shown in Figure 4 tending to coat both rear and front interior surfaces of the arrestor panel. The arrestor panels are set in apertures of a wall frame work 34 of a size and shape to accept them. They may be secured by clips or may be of a sufficiently tight fit to stand freely in the apertures.
Behind each arrestor panel a spray trap 36 may be ~29~8~i secured to the wall frame 34. The spray trap 36 may comprise a short length of duct or tube having similar cross-section as the plane of the arrestor panel.
Suitably, a flange 38 extending outwardly from the 5 forward surface of the duct 36 may be used to connect the duct to the frame work. The rear of the duct 36 may be provided with an inwardly extending flange 40 which serves to retain filter 42 which is of the same peripheral dimensions and shape as the arrestor panel 28.
The filter 42 is suitably formed to mitigate any tendency to sag in the filter material. This may be achieved by utilizing a wire frame 44 to maintain the shape of the filter 42. The wire frame 44 may suitably comprise a peripheral frame with at least one 15 strengthening cross-wire in either of the vertical or horizontal directions. The actual filter material may comprise a front sheet of filter material and a rear sheet of filter material with the wire frame 44 sandwiched therebetween. The sheets of filter material may be 20 connected, for example, by sealers at the top and bottom edges so that the wire frame 44 may hold them in position agai.nst sagging. In particular the wire frame 44 holds the top edges from sagging below the top edge of the frame 44. Thus a gasket of filler material may be formed 25 around the edges of the frame 44 especially when the side edges of the sheets are also sealed about the grid. One of these sheets is suitably polyester material and the other sheet may be fiberglass material. However9 this is a matter of choice.
In operation, an operator 50 using a spray gun 52 may spray an object 20 being conveyed by the conveyor 22.
Over-spray will be conveyed by air current entering the ,j, . . .
~6E38~;
spray booth l0 at inlet 26 and being directed through the filter wall 12 under the influence of exhaust fan 24 in exhaust vent 16. The over-spray will first pass through the arrestor panels and will coat the front surface thereof and interior surfaces with wet paint spray.
Since the holes 30 of the arrestor panels are of an appreciable size, paint build-up on these panels can be considerable without clogging. However, as these panels are of board or other semi-rigid material, there is little tendency to sagging or breaking to damage the integrity of the paint arresting system.
When any over-spray which is not entrapped by the arrestor panel reaches the space within the duct 36, in front of the filter 42, there may be a tendency for wet or dry paint particles to settle out in this space. This will fall into the duct 36 and can later be removed. Any still remaining, paint contaminant will then pass into filter 42. The loading of spray into th;s filter 42 is quite slight in comparison with the total amount of over-spray initially produced. Even so, there may be somebuild-up in weight of entrapped spray in this filter.
Therefore, precautions are taken in the provision of the wire grid to maintain the shape of filter 42. Moreover, the edges of this filter 42 which are sealed or otherwise connected about the wire grid 44 which may act to firmly locate the filter 42 within the duct 36, flange 40 serving to support the filter 42 from the rear.
If there is any over-spray still remaining in the air current, after it has passed through arrestor panel 28, the space within duct 36 and filter 42, it may settle out in the remaining rear compartment 18 of the spray boothO
~owever it has been found from tests made on a primary ~%9~8~
_ 9 _ arrestor panel and a secondary filter trap according to the invention, the efficiency may be about 75% in the arrestor panel and more than 95% of the remaining spray.
Thus it may be calculated that when using a system embodying the invention, at a very high average density of over-spray generated while painting and calculated at 0.73 grains per cubic foot of exhaust air, the efficiency factors of the filters would provide a stack emission rate of less than 0.01 grains per cubic foot of exhaust air.
,, ,
Claims (12)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE
DEFINED AS FOLLOWS:
1. In a system for mitigating over-spray during paint spraying, the system comprising a wall in front of which objects are paint sprayed, the wall having paint spray arrestor panels interchangeably located in a wall framework, and exhaust means to provide an air current from front to rear through the arrestor panels;
a spray trap located behind each of at least some of the arrestor panels, the spray trap comprising:
a filter spaced from the arrestor panel by a duct, the cross section of which conforms to the periphery of an arrestor panel, and which, at one end, has means for attachment to the wall framework and, at the other end, is closed by the filter.
a spray trap located behind each of at least some of the arrestor panels, the spray trap comprising:
a filter spaced from the arrestor panel by a duct, the cross section of which conforms to the periphery of an arrestor panel, and which, at one end, has means for attachment to the wall framework and, at the other end, is closed by the filter.
2. A system as claimed in Claim 1, in which the filter is spaced from the arrestor panel by a distance of at least about 6".
3. A system as claimed in Claim 1, in which the filter is interchangeable in the duct and comprises a rigid wire frame between two sheets of filter material which sheets are connected together at their top and bottom edges about the wire frame.
4. A system as claimed in Claim 3, in which the filter includes a grid comprising a panel of formed wire.
5. A system as claimed in Claim 4, in which the panel of framed wire comprises a peripheral wire portion and at least one cross wire.
6. A system as claimed in Claim 5, in which one of the filter sheets comprises a fibreglass pad and the other of the sheets comprises a polyester pad.
7. In combination for location into a wall framework of a paint spraying booth, a paint spray arrestor panel and a spray trap for location rearwardly of the arrestor panel, the spray trap comprising a filter spaced from the arrestor panel by a duct, the cross section of which conforms to the periphery of an arrestor panel, and which, at one end, has means for attachment to the wall framework and, at the other end, is closed by the filter.
8. A spray trap as claimed in Claim 7, in which the filter is spaced from the arrestor panel by a distance of at least about 6".
9. A spray trap as claimed in Claim 7, in which the filter is interchangeable in the duct and comprises a rigid wire frame between two sheets of filter material which sheets are connected together at their edges about the wire frame.
10. A spray trap as claimed in Claim 9, in which the wire frame comprises a peripheral wire and framed wire.
11. A spray trap as claimed in Claim 10, in which the panel of formed wire comprises a peripheral wire portion and at least one cross wire.
12. A spray trap as claimed in Claim 11, in which one of the filter sheets comprises a fibreglass pad and the other of the sheets comprises a polyester pad.
W:SERVAIR:582345.pgs
W:SERVAIR:582345.pgs
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000582345A CA1296885C (en) | 1988-11-04 | 1988-11-04 | Air filtering system for paint spray |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000582345A CA1296885C (en) | 1988-11-04 | 1988-11-04 | Air filtering system for paint spray |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1296885C true CA1296885C (en) | 1992-03-10 |
Family
ID=4139051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000582345A Expired - Lifetime CA1296885C (en) | 1988-11-04 | 1988-11-04 | Air filtering system for paint spray |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1296885C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0950435A3 (en) * | 1998-04-15 | 2004-03-24 | Krautzberger GmbH | Wall module of a spray booth and wall built of these modules |
-
1988
- 1988-11-04 CA CA000582345A patent/CA1296885C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0950435A3 (en) * | 1998-04-15 | 2004-03-24 | Krautzberger GmbH | Wall module of a spray booth and wall built of these modules |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |