US3827400A - Coating apparatus - Google Patents

Coating apparatus Download PDF

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Publication number
US3827400A
US3827400A US00294995A US29499572A US3827400A US 3827400 A US3827400 A US 3827400A US 00294995 A US00294995 A US 00294995A US 29499572 A US29499572 A US 29499572A US 3827400 A US3827400 A US 3827400A
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US
United States
Prior art keywords
coating
receptacle
level
chamber
fluidized
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
US00294995A
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English (en)
Inventor
J Grenfell
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.)
Badalex Ltd
Original Assignee
Badalex Ltd
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/05—Fluidized bed

Definitions

  • At least one supplementary fluidized bed which contains a supply of additional coating material, the level of the supplementary bed being capable of being raised to a level above that of the main bed whereby additional coating material is transferred from the supplementary bed to the main bed to replenish the coating material therein. Once the desired level has-been achieved, the level of the supplementary bed is lowered and any surplus coating material is arranged to fall back into the supplementary bed.
  • COATING APPARATUS This invention relates to coating apparatus of the type in which an article to be coated is immersed in a fluidized bed of the coating material in powder form.
  • one method involves the establishment of the fluidized bed, into which the articles to be coated, usually preheated, are immersed.
  • a coating of the powder adheres to each article, and the powder coat can be made into a coherent coating, sometimes by the heat of the preheated article or sometimes by subsequent heat treatment, or both.
  • the coat ing process can be repeated if necessary to secure an adequately thick coating.
  • the article should be immersed in the fluidised bed to a specific depth.
  • certain electrical components such as capacitors
  • components such as capacitors
  • the present invention provides coating apparatus comprising a first recepticle, means for producing coating material in a fluidized condition in the receptacle, a second receptacle, means for producing coating material in a fluidized condition in the second recepticle, and means for inducing flow of material in a fluidised condition from the second receptacle to the first receptacle.
  • FIG. 1 is a fragmentary side elevational view of a fluidized bed apparatus
  • FIG. 2 is a plan view of the apparatus of FIG. 1;
  • FIG. 3 is a sectional view taken on the line l1l-111 of FIG. 1;
  • FIG. 4 is a view similar to that of FIG. 3 showing a further fluidized bed apparatus.
  • FIG. 5 is a view similar to that of FIG. 4 showing yet another fluidized bed apparatus.
  • the apparatus comprises an elongated base, comprising longitudinal side walls 10, end walls 11 and a base plate 12.
  • Running along the length of the base are two partitions 13 and 14; these partitions run the full length of the base, and so define a central cavity 15 and side cavities 16 and 17.
  • the top of the base portion is closed by an air permeable diaphragm 18, the diaphragm closing the three cavities 15, 16 and 17.
  • an upper container 19 secured by bolts such as which also serve to hold the parts of the base together.
  • dividers 21 and 22 which are parallel to each other and to the sides of the container, the dividers being arranged above the partitions 13 and 14 respectively, and secured to them by bolts as at 23. As is shown more clearly in FIG. 3, the upper edges of the dividers are tapered to a fine edge. End members 24 are provided for the dividers.
  • the bottom plate of the base portion is carried on vibration mountings 29 and 30 from a series of support columns 31 and 32, from a base platform 33, and a vibrator assembly 34 is disposed between the base platform and the lower part of the base portion, so that the upper part of the general assembly can be vibrated 1n use.
  • Means 15 are provided for supplying air under pressure to the cavity 15, and a separately controllable supply 16 of air to the cavities 16 and 17.
  • powder coating material which is to be applied to an article, such as 35 to be coated is placed within the chamber 26.
  • the volume of powder inserted is such that with a suitable supply of air to the plenum chamber formed by cavity 15, a fluidized bed will be established in the chamber 26.
  • the article 35 conveniently pre-heated, can be inserted into the chamber or, as may be more convenient, the entire assembly can be lifted up to an extent such that the article becomes immersed in the fluidized material in the chamber 26. After a suitable time, the article is withdrawn from the fluidized bed, for subsequent treatment.
  • the fluidized material in chamber 26 is arranged substantially to fill that chamber but at the end of the dipping operation, or a series of such operations, it may be that the material then contained in the chamber is insufficient to raise the level of the fluidized bed to the upper extremity of the chamber, defined by the sharp edges of the dividers 21 and 22.
  • the apparatus comprises a base 40, longitudinal side walls 41, end walls 42 and a base plate 43.
  • a partition 44 which defines cavities 45 and 46.
  • the top of the base portion is closed by an air permeable diaphragm 47, the diaphragm closing the cavities 45 and 46.
  • an upper container 50 Secured to the base portion above the diaphragm is an upper container 50, secured such as by bolts which also serve to hold the parts of the base together.
  • Within the container 50 is a longitudinal divider 51 which is parallel to the sides of the container, the divider being arranged above and secured to the partition 44 such as by bolts.
  • the upper edge of the divider 51 is tapered to a fine edge.
  • a main chamber 52 disposed above the cavity 45, and a supplementary chamber 53 disposed above the cavity 46.
  • the bottom plate of the base portion can be carried on vibration mounting such as from a series of support columns mounted on a base platform, and a vibrator assembly disposed so that the upper part of the general assembly can be vibrated in use in the manner already disclosed.
  • Means 45' are provided for supplying air under pressure to the cavity 45, and a separately controllable supply 46' of air to the cavity 46.
  • a bellcrank lever 55 Adjacent the container 50 is a bellcrank lever 55 having arms 56 and 57 mounted on stub shaft 58.
  • the free end of arm 56 is connected by rod 59 to an air cylinder 60 whereby the lever can be pivoted on shaft 58.
  • Arm 57 extends over charging chamber 53 such that a paddle 61 depending from its free end extends into the charging chamber.
  • the paddle can be moved vertically and horizontally, with its free end oscillating along the line of arrow A-A.
  • the coating of an article is carried out in the manner already described using the fluidised bed produced in main chamber 52.
  • FIG. 5 there is shown apparatus in which components similar to those of FIG. 4 have the same reference number and suffix a.
  • a plunger system comprising an air cylinder 66 operable to reciprocate a rod 67 as shown by arrow B--B and a cylindrical member 68 movable with the rod 67 and having its axis longitudinal of chamber 53a.
  • Operation of the apparatus is similar to that described above for FIG. 4 except that at the end of a dipping operation or a series of such operations air cylinder 66 is actuated to move cylindrical member 68 into chamber 53a and thereby displace fluidized material into chamber 52a.
  • any excess material fed to chamber 52a will spill back into chamber 53a leaving the former chamber precisely filled at the air pressure then existing in cavity 450.
  • member 68 can be other than of cylindrical form.
  • the dividers 21, 22, 51 and 51a are provided with surfaces which slope from the sharp edge defined at their upper edges, with the surfaces inclined.
  • edge of the dividers are provided by replaceable inserts, rather than shaping the edges as described above.
  • Apparatus for coating an article with a fluidized material comprising a. a coating receptacle;
  • said level raising means comprises means for increasing the gas pressure to the second mentary receptacle.
  • said level raising means comprises means arranged to be plumged into the coating material in the second recepticle to displace the material contained therein.
  • said level raising means comprises means for generating a wave of additional coating material.

Landscapes

  • Coating Apparatus (AREA)
  • Moulding By Coating Moulds (AREA)
US00294995A 1971-10-05 1972-10-04 Coating apparatus Expired - Lifetime US3827400A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4623571 1971-10-05
GB2361872 1972-05-19

Publications (1)

Publication Number Publication Date
US3827400A true US3827400A (en) 1974-08-06

Family

ID=26256629

Family Applications (1)

Application Number Title Priority Date Filing Date
US00294995A Expired - Lifetime US3827400A (en) 1971-10-05 1972-10-04 Coating apparatus

Country Status (5)

Country Link
US (1) US3827400A (enExample)
JP (1) JPS4845554A (enExample)
BE (1) BE789666A (enExample)
DE (1) DE2248553A1 (enExample)
FR (1) FR2155538A5 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875898A (en) * 1974-01-25 1975-04-08 Illinois Tool Works Fluidized bed apparatus for coating elements
US3884182A (en) * 1974-04-23 1975-05-20 Peter Charles Jones Fluidised bed apparatus
US3942721A (en) * 1974-04-03 1976-03-09 Robert Bosch Gmbh Fluidized powder feed system for rotary distributor of electrostatic coating apparatus
US4877655A (en) * 1987-07-15 1989-10-31 Figgie International Inc. Ball holding and cementing apparatus and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485906A (en) * 1892-11-08 Process of and machine for soldering
US2506317A (en) * 1947-02-15 1950-05-02 Standard Oil Dev Co Removal of heat from finely-divided solids
US2574493A (en) * 1949-04-18 1951-11-13 Mclean Lyle Gordon Classifier and separator
US2711387A (en) * 1949-11-30 1955-06-21 Exxon Research Engineering Co Treating subdivided solids
US2725348A (en) * 1949-12-30 1955-11-29 Exxon Research Engineering Co Fluidized distillation of oil-bearing minerals
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US3364053A (en) * 1963-10-12 1968-01-16 Polymer Corp Method of coating articles
US3389010A (en) * 1964-08-27 1968-06-18 Gen Motors Corp Method for coating articles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485906A (en) * 1892-11-08 Process of and machine for soldering
US2506317A (en) * 1947-02-15 1950-05-02 Standard Oil Dev Co Removal of heat from finely-divided solids
US2574493A (en) * 1949-04-18 1951-11-13 Mclean Lyle Gordon Classifier and separator
US2711387A (en) * 1949-11-30 1955-06-21 Exxon Research Engineering Co Treating subdivided solids
US2725348A (en) * 1949-12-30 1955-11-29 Exxon Research Engineering Co Fluidized distillation of oil-bearing minerals
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US3364053A (en) * 1963-10-12 1968-01-16 Polymer Corp Method of coating articles
US3389010A (en) * 1964-08-27 1968-06-18 Gen Motors Corp Method for coating articles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875898A (en) * 1974-01-25 1975-04-08 Illinois Tool Works Fluidized bed apparatus for coating elements
US3942721A (en) * 1974-04-03 1976-03-09 Robert Bosch Gmbh Fluidized powder feed system for rotary distributor of electrostatic coating apparatus
US3884182A (en) * 1974-04-23 1975-05-20 Peter Charles Jones Fluidised bed apparatus
US4877655A (en) * 1987-07-15 1989-10-31 Figgie International Inc. Ball holding and cementing apparatus and method

Also Published As

Publication number Publication date
JPS4845554A (enExample) 1973-06-29
BE789666A (fr) 1973-02-01
FR2155538A5 (enExample) 1973-05-18
DE2248553A1 (de) 1973-04-12

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