CA1081451A - Procedure regarding use of the voiding air in a spray painting booth and spray painting booth for use in the procedure - Google Patents

Procedure regarding use of the voiding air in a spray painting booth and spray painting booth for use in the procedure

Info

Publication number
CA1081451A
CA1081451A CA251,086A CA251086A CA1081451A CA 1081451 A CA1081451 A CA 1081451A CA 251086 A CA251086 A CA 251086A CA 1081451 A CA1081451 A CA 1081451A
Authority
CA
Canada
Prior art keywords
air
chamber
booth
painting
paint
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
Application number
CA251,086A
Other languages
French (fr)
Inventor
Artturi Maatta
Original Assignee
Artturi Maatta
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 to FI751264A priority Critical patent/FI54567C/en
Application filed by Artturi Maatta filed Critical Artturi Maatta
Application granted granted Critical
Publication of CA1081451A publication Critical patent/CA1081451A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/46Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C15/00Enclosures for apparatus; Booths

Abstract

ABSTRACT OF THE DISCLOSURE:

Ventilation of a spray painting booth having a spray painting chamber provided with an open end through which painting is carried out. The chamber has nozzles around the open front end for the introduction of ventilation air.
Approximately 20% of this ventilation air comes from the heated room in which the booth stands while the remaining 80% is either air that has been cleaned after being sprayed in the chamber or air drawn from outside the heated room.

Description

108145~

The present invention relates to a method applicable during spray painting to improve the enconomy of the spray painting booth particularly as regards the use of the ventilation air.
When it is desired to paint objects by means of a spray gun in a painting booth, the following arrangement is usually followed in the construction of the booth. It comprises a chamber in which the object to be painted is placed. The person doing the painting remains outside the chamber and paints through the front end of the chamber, which front end is open. A water curtain or the like filter is provide~on the rear wall upon which paint, driven with high velocity against the object, is projected.
The booth is fitted with a blower drawing air through the open front end of the booth thereby to prevent escape of paint mist from the booth through its open front end. The ventilating air is drawn from the booth through a suction slit, along the surface of water tray below the water curtain. Air-paint mixture passes over the water surface with a speed such that water is drawn along with the air. The mixture rises with high velocity into a water - washing section behind the painting chamber, where separator baffle plates force the mixture to change direction several times. In this connection, the heavier paint particles are driven by cen-; . .
trifugal force into the water stream. The water ascending along with the ventilation air is separated on the separation plates foundin the washing section. The water flows down into the tray, and the ventilation air exists through the blower into the atmosphere. The ventilation air still contains gases which have come from the paint substances. In spray painting booths, of the type described, the air drawn from the painting chamber passes through the blower into the atmosphere.
When, in the course of painting, the air to be used is drawn from the room in which the booth and the painter stands, ;
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10~3~L451 a considerable quantity of air is used during the work, which air is heated if the work takes place during the prolonged cold period ~;
in certain countries as in Finland. It follows that much heating energy is~wasted because the painting method itself does not necessarily require heated air, although it is indispensable that the room in which the worker stand~s has to be heated.
The object of the present invention is to eliminate this drawback. This is accomplished, according to the invention, by taking only part of the ventilation air from inside. The major part of the ventilation air is either returned and reused or taken straight from outdoor.
No such method has been applied in the prior art. Thus large amounts of warm air have been wasted. Only in a spraying method, of the type wherein the paint substance is blown with the aid of compressed air in a closed chamber, is it known to return the air, purified of paint substances, to the pressure tank and to reuse a great proportion thereof in the spray gun. sut this last-described spraying method is completely different from what the spraying according to the present invention implies. The spray painting method of the invention is intended for use in such spray painting wherein the spraying booth is open on the side facing the operator and wherein, with the aid of the exhaust air, the spreading of paint fog frqm the spraying side to interior spaces, out from the spraying chamber, is prevented.
Accordingly, the invention as herein broadly claimed is a method of ventilating a spray painting booth standing in a heated room, this booth having a painting chamber, painting being carried out by spreading paint through an open front end of the - chamber. The method lies in introducing ventilation air through the front end of the painting chamber from around this front end and controlling pressure conditions in the booth so that about 20%

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of the ventilation air is drawn from the heated room.
The invention, also as herein broadly claimed, is a spraying paint booth comprising a painting chamber adapted to stan~ in a heated room and having an open front end through which paint is sprayed by a painter standing in the heated room. Means are provided around the open front end of the chambee for intro-; ducing ventilation air into the chamber and other means are provided for controlling pressure conditions in the booth so that about 20% of the air introduced into the chamber is drawn from the heated room.
A preferred embodiment of the invention will now be ^ described in conjunction with the appended drawings wherein:
Fig. 1 shows a spray painting booth wherein one intendsto apply the procedure of the invention. Fig. 2 is an axonometric drawing of a spray painting booth in which the procedure of the invention has been applied.
Fig. 1 shows schematically a spray booth which stands in a heated room. A painter 12 sprays an object 10 that has been ;- placed in a chamber 1 of the booth. A water curtain 4 flows . . .
downwardly alor.g the rear wall of the painting booth, from a pipe 5, to the bottom of the chamber. Paint drawn along with the , . .
;~ water is collected in a box 2 on the bottom of the chamber. Ven-.
tilation air is drawn from the booth through a suction slit 9 provided along and above the tray, suction being obtained by a centrifugal blower 6 placed on top of the booth, this blower being driven by a motr 7. The air-paint mixture, in which water . is also present, rises with high velocity into a water cleaning ~,'r flue 3, where separator baflle plates 8 force the mixture to change direction several times. The heavier paint particles are .: . .
captured by the water stream which is separated from the air by means of the said baffle plates 8. Clean air exhauts, through the "` .

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blower, into the atmosphere. In order that no warm air be ~ -wasted, the invention provides two ways in which this can be achieved. Both serve the purpose of saving heated room air and substituting, largely, air from other sources.
The first way implies that the air which is carried through the water curtain or through another filter and which is free of paint particles is recycled, that is returned to the booth, as shown by the arrows in Fig. 2. However, the arrangement is such that in each cycle a given part, e.g. about 20~, of the used air is al-lowed to escape to atmosphere. This quantity is replaced byheated air taken from the room in which the booth stands.
The recycled or recirculated air will carry residual gases from the paint substances. If the paint substances contain gases in such quantity that the circulation according to the first mode is not allowed by fire authorities, then about 80% of the ventilation air is taken directly from outdoors and the rest, about 20~, consists of heated indoor air, drawn from the room,similarly ; as in the foregoing. The ventilation air is introduced into the chamber in such manner that it does not come into contact with the object to be painted nor with the operator. As a consequence, the cleanness and temperature of this air have no significance.
During the cold season the use of outdoor air may cause freezing of the~water. This may be prevented by using salt and, for prevention of rust, an inhibitor agent, or other expedients known in prior art. When the entry of recirculated air into the painting chamber has been properly arranged and the suction and pressure conditions have been correctly chosen, the appropriate ~ quantity of room air will flow towards the ob~ect that is being `~` painted.

By the process and spray painting booth of the invention, which is employed in association with painting booths with open -.
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. ' 1081~51 front end in which booths at present the ventilation air is taken from that room in which the operator stands, major economic savings are achieved, especially now that the fuel prices have gone up consid~rably.

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Claims (7)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. Method of ventilating a spray painting booth standing in a heated room, said spray painting booth having a painting chamber, wherein painting is carried out by spraying paint through an open front end of said chamber, characterized in that ventilation air is introduced in said chamber through means around said front end of said chamber, and pressure condi-tions in said booth are controlled so that about 20% of said ventilation air introduced into said chamber is drawn from said heated room.
2. Method according to claim 1, including cleaning used ventilation air of paint substances and returning approxi-mately 80% of said air thus cleaned to said painting chamber through said means around said front end, and releasing the rest of said cleaned air to atmosphere.
3. Method according to claim 1, wherein about 80%
of said ventilation air introduced through said means around said front end is drawn from outdoor and about 20% is drawn from said heated room.
4. Method according to claim 3, wherein paint-loaded air from said painting chamber is cleaned by a water curtain and wherein, during cold weather, salt and an inhibitor are used in the water of said curtain to prevent freezing thereof.
5. A spray painting booth comprising: a painting chamber adapted to stand in a heated room and having an open front end through which paint is sprayed into said chamber by a painter in said room; means around said open front end for introducing ventilation air into said chamber and means for controlling pressure conditions in said booth so that about 20% of said air introduced into said chamber is drawn from said heated room.
6. A booth as claimed in claim 5, comprising means for cleaning paint-loaded air from said painting chamber and means for recycling 80% of the thus cleaned air through said means around said open front end, the remaining 20% of said cleaned air being released to atmosphere.
7. A booth as claimed in claim 5, comprising means drawing about 80% of said ventilation air, introduced around said open front end, from atmosphere.
CA251,086A 1975-04-26 1976-04-23 Procedure regarding use of the voiding air in a spray painting booth and spray painting booth for use in the procedure Expired CA1081451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI751264A FI54567C (en) 1975-04-26 1975-04-26 FOERFARANDE FOER ANVAENDNING AV AVLUFT I ETT SPRUTMAOLNINGSSKAOP OCH DET VID FOERFARANDET ANVAENDA SPRUTMAOLNINGSSKAOP

Publications (1)

Publication Number Publication Date
CA1081451A true CA1081451A (en) 1980-07-15

Family

ID=8509168

Family Applications (1)

Application Number Title Priority Date Filing Date
CA251,086A Expired CA1081451A (en) 1975-04-26 1976-04-23 Procedure regarding use of the voiding air in a spray painting booth and spray painting booth for use in the procedure

Country Status (4)

Country Link
CA (1) CA1081451A (en)
FI (1) FI54567C (en)
NO (1) NO761390L (en)
SE (1) SE7604695L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4952221A (en) * 1988-04-21 1990-08-28 Taikisha Ltd. Gas cleaning apparatus containing a centrifugal type paint mist separator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4952221A (en) * 1988-04-21 1990-08-28 Taikisha Ltd. Gas cleaning apparatus containing a centrifugal type paint mist separator

Also Published As

Publication number Publication date
FI54567B (en) 1978-09-29
CA1081451A1 (en)
FI751264A (en) 1976-10-27
FI54567C (en) 1979-01-10
NO761390L (en) 1976-10-27
SE7604695L (en) 1976-10-27

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