US3695226A - Spraying booth - Google Patents

Spraying booth Download PDF

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Publication number
US3695226A
US3695226A US40593A US3695226DA US3695226A US 3695226 A US3695226 A US 3695226A US 40593 A US40593 A US 40593A US 3695226D A US3695226D A US 3695226DA US 3695226 A US3695226 A US 3695226A
Authority
US
United States
Prior art keywords
enclosure
booth
openings
air
open front
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
US40593A
Other languages
English (en)
Inventor
Maurice Paul Wanner
Neil Rudolph Wallis
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.)
Aerocoat SA
Original Assignee
Aerocoat SA
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
Application filed by Aerocoat SA filed Critical Aerocoat SA
Application granted granted Critical
Publication of US3695226A publication Critical patent/US3695226A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention provides a spraying booth for facilitating the recovery of the surplus of pulverulent material used to coat an object with an electrostatic gun.
  • particles of pulverulent material projected by an electrostatic gun do not all end up on the object to be coated. For various reasons it is desirable to recover this unused or excess material. That is why the object to be coated is usually placed in a booth, open at the front to give access to the gun.
  • the various air currents which manifest themselves near the opening of the booth e.g., the air currents that are to be found in any workshop or those that are set up under the convection effect of the operators body, cause a rather substantial amount of pulverulent material to be drawn out of the boothv and to be disseminated in the atmosphere of the workshop, instead of depositing on the base of the booth.
  • the rear of the booth is usually connected to an air extraction installation the effect of which is to establish a negative pressure in the booth thereby tending to prevent the particles of pulverulent material fromleaving the booth through the opening at the front.
  • An object of the present invention is to produce a spraying booth which eliminates, at least to a large extent, the above-mentioned drawbacks.
  • the booth provided by the invention includes means for enabling it to communicate with an air extraction installation.
  • the booth is open at the front to give access to the gun, and has a vertical cross-section that increases from the front rearwards.
  • FIGURE of the accompanying diagrammatic drawing shows in perspective by way of example, one possible embodiment of the spraying booth provided by the present invention.
  • the spraying booth illustrated in the drawing comprises two main parts A and B whose walls are made of insulating material, e.g., glass fiber.
  • part A is shaped like a truncated pyramid, open at the front
  • part B located behind part A, is shaped like a parallelepiped and is closed off by a wall 10, also of insulating material.
  • the object is first positioned in the booth, in this instance by placing it on a horizontal grid 14 of conductive material, e.g., aluminum, that is grounded.
  • a horizontal grid 14 of conductive material e.g., aluminum
  • the operator holding an electrostatic gun, stands before the opening of the booth and aims the gun at the object.
  • pulverulent material is fed under pressure to the head of the gun where the particles are charged by means of a highvoltage direct-current source, to which the gun is connected, in order to be moved towards the object to be coated, the latter being the conductive object nearest the gun head. 4
  • the booth is connected to an air extraction installation (not shown).
  • This connection is established through holes 12 formed in the wall 10, which holes open out into a chamber 16 located behind the wall 10 and communicating through a horizontal series of holes that are not visible with a semi-cylindrical collector 18 connected to a discharge conduit (not shown).
  • the flow rate of the extraction installation is so adjusted that the speed at which the air flows through the opening of the booth may be as small as possible, i.e., just high enough to prevent the particles of excess pulverulent material from issuing from the booth at the front.
  • the speed at which air enters the booth correspondingly decreases so that the excess material particles, instead of being entrained through the holes l2 with the aspirated air, mostly drop on to the inclined base 20 of part A of the booth and into a channel 22 formed at the bottom of part B of the :booth.
  • This channel 22' is provided to facilitate the removal of the thus recovered pulverulent material.
  • the grid 14 could be dispensed with, a transverse slot could be formed in the ceiling of part A of the booth and an endless chain could be provided which passes above the booth over the transverse slot and which is fitted with a succession of hooks successively passing through the booth along the slot.
  • openings of suitable size are made in the side walls of part A of the booth.
  • it could be carried by a metal hook suspended from a metal wire extending through a hole in the ceiling of part A of the booth to be secured to the ceiling of the workshop and be grounded.
  • the booth can have many shapes: part A and B can, respectively, have a frusto-conical shape and a cylindrical shape; for reasons of space, the booth may have a constant width, i.e. the width at the rear is the same as at the front, the varying cross-section occurring solely heightwise.
  • the larger geometric base of part A of the booth has in the illustrated example an area about four times as large as that of its smaller geometric base, good results can already be achieved with a ratio of areas of 2 l.
  • the booth can be made of plastics sheet material, mounted on a frame of non-conductive material.
  • a spraying booth for spray coating a dry sprayed material onto an object within said booth comprising, in combination: a booth enclosure having a bottom and enclosing wall means, said wall means defining an open front for admission of said dry sprayed material into said enclosure and for forming an air flow inlet to said enclosure, said wall means including sides and a rear portion and also defining openings in said rear portion of the enclosure distributed over an area greater than the areaof said open front, said openings forming an air flow outlet from said enclosure, said enclosure including means for support of an object located intermediate said open front and said openings, said means for support defining the position where an object to be sprayed is placed in said enclosure, said booth also comprising air collector means communicating with said enclosure through said openings, said collector means connectable with air extractor means to positively draw air through said open front, about said means for support and an object supported thereby and then to withdraw air from said booth through said openings and into said collector means, to maintain the velocity of air, at least about an object supported by said means for support relatively less than the velocity
  • a spraying booth according to claim 1 having a vertical cross section that increases from the front rearwards.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
US40593A 1969-06-25 1970-05-26 Spraying booth Expired - Lifetime US3695226A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH970169A CH527651A (fr) 1969-06-25 1969-06-25 Cabine de giclage

Publications (1)

Publication Number Publication Date
US3695226A true US3695226A (en) 1972-10-03

Family

ID=4354698

Family Applications (1)

Application Number Title Priority Date Filing Date
US40593A Expired - Lifetime US3695226A (en) 1969-06-25 1970-05-26 Spraying booth

Country Status (10)

Country Link
US (1) US3695226A (en, 2012)
JP (1) JPS4829298B1 (en, 2012)
AU (1) AU1534470A (en, 2012)
BE (1) BE752342A (en, 2012)
CH (1) CH527651A (en, 2012)
DE (1) DE2031081A1 (en, 2012)
ES (1) ES381157A1 (en, 2012)
FR (1) FR2052870A5 (en, 2012)
GB (1) GB1303168A (en, 2012)
NL (1) NL7008969A (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814002A (en) * 1973-04-26 1974-06-04 Nordson Corp Powder spray booth
US3824912A (en) * 1972-12-29 1974-07-23 Elektro Ion Powder spray booth
US4941427A (en) * 1987-09-24 1990-07-17 Esselte Pendaflex Corporation Spray booth
US20150336120A1 (en) * 2012-12-21 2015-11-26 Manish Khandelwal Deposition cloud tower with adjustable field

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS552259U (en, 2012) * 1979-04-17 1980-01-09

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824912A (en) * 1972-12-29 1974-07-23 Elektro Ion Powder spray booth
US3814002A (en) * 1973-04-26 1974-06-04 Nordson Corp Powder spray booth
US4941427A (en) * 1987-09-24 1990-07-17 Esselte Pendaflex Corporation Spray booth
US20150336120A1 (en) * 2012-12-21 2015-11-26 Manish Khandelwal Deposition cloud tower with adjustable field
US10413932B2 (en) * 2012-12-21 2019-09-17 Doosan Fuel Cell America, Inc. Deposition cloud tower with an insert for adjusting the deposition area

Also Published As

Publication number Publication date
FR2052870A5 (en, 2012) 1971-04-09
DE2031081A1 (de) 1971-02-11
NL7008969A (en, 2012) 1970-12-29
ES381157A1 (es) 1972-11-16
AU1534470A (en) 1971-11-25
BE752342A (fr) 1970-12-01
GB1303168A (en, 2012) 1973-01-17
CH527651A (fr) 1972-09-15
JPS4829298B1 (en, 2012) 1973-09-08

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