GB1558899A - Process and apparatus for electrostatically coating with pulverized material - Google Patents
Process and apparatus for electrostatically coating with pulverized material Download PDFInfo
- Publication number
- GB1558899A GB1558899A GB46871/77A GB4687177A GB1558899A GB 1558899 A GB1558899 A GB 1558899A GB 46871/77 A GB46871/77 A GB 46871/77A GB 4687177 A GB4687177 A GB 4687177A GB 1558899 A GB1558899 A GB 1558899A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulverized material
- pulverized
- chamber
- suction
- 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
Links
- 239000000463 material Substances 0.000 title claims description 54
- 239000011248 coating agent Substances 0.000 title claims description 25
- 238000000576 coating method Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 23
- 229920005989 resin Polymers 0.000 claims description 39
- 239000011347 resin Substances 0.000 claims description 39
- 239000011521 glass Substances 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 24
- 238000009503 electrostatic coating Methods 0.000 claims description 12
- 229920003002 synthetic resin Polymers 0.000 claims description 10
- 239000000057 synthetic resin Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000013013 elastic material Substances 0.000 claims description 3
- 210000003298 dental enamel Anatomy 0.000 claims description 2
- 230000008774 maternal effect Effects 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000021443 coca cola Nutrition 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
- B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
-
- 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
- B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/042—Directing or stopping the fluid to be coated with air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
- B05D2203/30—Other inorganic substrates, e.g. ceramics, silicon
- B05D2203/35—Glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
-
- 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
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Elimination Of Static Electricity (AREA)
Description
(54) PROCESS AND APPARATUS FOR ELECTROSTATICALLY
COATING WITH PULVERIZED MATERIAL
(71) We, ONODA CEMENT COM
PANY LIMITED, a Japanese Company, of 6276, Ohaza Onoda, City of Onoda, Yamaguchi Prefecture, Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a process and apparatus for electrostatically coating with pulverized material, in particular coating glass bottles and other axially symmetrical objects with pulverized material. More particularly, this invention relates to a continuous process for electrostatically coating an axially symmetrical object with pulverized synthetic resin and to an apparatus for carrying out the process.
Recently, it has been desired to coat a film of synthetic resin on glass bottles of carbonated drinks such as Coca-Cola (Registered Trade Mark) and the like in order to prevent the glass bottles from breaking during handling and/or because of a rise in internal pressure in the bottles due to sunlight. According to the conventional electrostatic coating process, it is usually necessary to preheat a glass bottle to a temperature above the melting point of the pulverized synthetic resin since a glass bottle
Is an electric insulator. That is. the conventional electrostatic coating process comprises preheating a glass bottle to a temperature above the melting point of the resin in order to lower the electrical resistance of the glass, electrostatically coating pulverized synthetic resin on the preheated glass surface and then post-heating the resin-coated glass bottle to form a film of the resin on the surface of the glass bottle.
However, according to this conventional process, it is almost impossible to remove the surplus pulverized resin adhering to an undesired part of the bottle since the glass bottle is preheated. In order to prevent the pulverized resin from adhering to the undesired part (for example the mouth of the glass bottle), it is suggested to carry out the electrostatic coating while applying a gaseous jet stream to the vicinity of the mouth of the bottle to mask the mouth.
However, even by this method, it is substantially impossible to completely mask the mouth of the bottle, and consequently the pulverized resin often adheres to the mouth part of the bottle covered by the cap, thus producing various serious problems such as incomplete capping or decapping and the incorporation of the resin film waste into the contents of the bottle. Moreover, the pulverized resin also adheres to the holding arm or chuck of the device for holding the bottle, and, due to the accumulated and fired resin, the operation of the apparatus must sometimes be suspended.
In addition to the above-mentioned disadvantages, the thickness of the resin film formed on the upper part of the bottle tends to be uneven and thin, thus resulting in breakage or exfoliation of the resin film during washing or transportation of the resin-coated bottles. This is a serious problem for returnable glass bottles since the life of the glass bottle is shortened. Furthermore, for the purpose of improving the commercial value of glass bottles, the even coating of a resin film of uniform thickness is required. However, the conventional process comprising electrostatically coating the preheated glass bottle produces the abovementioned disadvantages and does not satisfy this requirement.
The present invention in one aspect provides a process for electrostatically coating an object with pulverized material, comprising conveying the object by means of a holding device into an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the cham ber, feeding into the chamber pulverized material electrically pre-charged at the same polarity as that of the silent discharge plate electrodes, electrostatically coating the object maintained at a temperature below the melting point of the pulverized material with the pulverized material by the action of silent discharge from the said electrodes.
and removing surplus pulverized material from specific parts of the object by suction.
The invention in another aspect provides apparatus for electrostatically coating an object with pulverized material, comprising an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the chamber where the pulverized material is coated on the surface of the object maintained at a temperature below the melting point of the pulverized material, a holding device for conveying the object into the chamber, a pulverized material feeder having an electrically pre-charging device to electrically pre-charge the pulverized material at the same polarity as that of the silent discharge plate electrodes and to feed the electrically pre-charged pulverized material into the chamber, and a device for removing surplus pulverized material from specific parts of the object by suction, whereby the object is electrostatically coated on desired parts thereof only.
By means of the apparatus according to the invention, the pulverized material is electrostatically coated on the desired part only in such a manner as to form a pulverized material layer having a uniform thickness and a clear boundary. The coated object is then heated to produce an object coated with pulverized material having a high endurance. Thus, the apparatus according to the invention provides a coated object having a high commercial value with a high efficiency.
Attention is drawn to our co-pending
Application No. 46872/77, serial No.
1558900 which describes and claims a method and an apparatus for electrostatic powder coating.
The invention will be further described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a schematic perspective view of an apparatus according to the invention for electrostatically coating a glass bottle with pulverized material;
Figure 2 is a sectional view of an upper suction slit used in a device for removing surplus powder:
Figure 3 is a sectional view of a lower suction slit used in the device for removing surplus powder;
Figure 4 is a plan view of Figure 2;
Figure 5 is a bottom view of Figure 3;
Figure 6 is a sectional view of a modification of the upper suction slit for removing surplus powder as shown in Figure 2;
Figure 7 is a sectional view of a modification of the lower suction slit for removing surplus powder as shown in Figure 3;
Figure 8 is a sectional view of a modification of the upper suction slit of Figure 2, which has a squeegee; and
Figure 9 is a sectional view of a modification of the lower suction slit of Figure 3, which has a squeegee.
As shown in the accompanying drawings, the apparatus comprises (1) an electrostatic coating chamber where pulverized synthetic resin is coated on the surface of a glass bottle conveyed into the chamber by means of a chuck of a movable holding device, and (2) a device for removing surplus powder from specific parts of the bottle including the mouth and/or bottom which are not desired to be coated.
As can be seen from Figure 1, glass bottles 1 ready to be electrostatically coated are fed one by one by a bottle-feeding device (not shown). The mouth of the bottle 1 is grasped by a chuck 3 of a chain conveyor type holding device 2, and the bottle 1 suspended by the device 2 is conveyed to an inlet of an electrostatic coating chamber 5 by means of the holding device 2. The chamber 5 is composed of a long and slender casing 6 (a section of which is shown in
Figure 1) having an outlet at the far end, and the bottle 1 suspended by the holding device 2 is electrostatically coated with pulverized synthetic resin while passing through the chamber 5. The top of the casing 6 has a slit-like opening in such a manner as to permit the passage of the chuck 3 of the holding device 2. The casing 6 of the chamber 5 has suction parts 7 on both sides of the upper part of the casing, silent discharge plate electrodes 8 on both sides of the casing and a pulverized resin feeder 9 at the bottom of the casing which feeds electrically pre-charged pulverized resin into the casing 6. The pulverized resin feeder 9 is preferably disposed at appropriate intervals according to the length of the casing 9.
The pulverized resin feeder 9 includes an electrical pre-charging device 11 where pulverized resin is pre-charged by corona discharge contact charging or any other appropriate method in the polarity the same as that of te silent discharge plate electrodes. and feeds the pre-charged pulverized resin into the casing 6 by means of an air flow. The pre-charged pulverized resin thus introduced into the casing 6 is electrostatically deposited on a glass bottle 1 passing through the casing 6 by the action of an electric field flowing from the silent discharge plate electrodes 8 to the glass bottle 1. thus forming a well charged tight pulverized resin layer on the surface of the glass bottle. Electric current or voltage of the silent discharge plate electrodes 8 and the pre-charging device 11 is controlled by an appropriate electric controller 12.
As disclosed in British Patent No.
1,509,389 the silent discharge plate electrodes 8 are composed of parallel filament electrodes embedded in insulation plates.
The silent discharge is caused on the surface of the plates by applying AC voltage between the parallel filament electrodes, and a minute discharge current and electric field flowing from the plates to the glass bottle are produced by superimposing DC voltage on the AC voltage while preventing the pulverized resin from adhering to the surface of the plates.
The suction parts 7 positioned on both sides of the upper part of the casing 6 each have a suction chamber 15, a suction inlet 16 on the inner side of the suction chamber 15, and an outlet 17 on the outer side of the suction chamber 15, the outlet 17 being connected to an appropriate dust collector and a suction fan (not shown) by way of a suction pipe 18. Accordingly, the suction parts 7 prevent pulverized resin from flowing out through the slit-like opening of the casing 6, and collect for re-use the pulverized resin which is not deposited on the surface of the bottle.
The casing 6 may additionally or alternatively have on its sides a pulverized resin feeder including a pre-charging device and having the same function as the above mentioned pulverized resin feeder 9. The additional pulverized resin feeder feeds resin powder onto the glass bottle from the lateral direction, and is useful for producing an especially thick pulverized resin layer on a specified part of the bottle or for adjusting the thickness of the layer depending on the layer depending on the shape of the bottle.
Following the electrostatic coating chamber 5, a suction slit device 21 for removing surplus powder is provided in such a manner as to remove powder from specific parts of the bottle including the top and/or the botton thereof.
As can been seen from Figures 2 to 5, the suction slit device 21 comprises suction slits 22 and 23 respectively positioned close to the top and the bottom of the bottle, the suction slits 22 and 23 being connected to an appropriate dust collector and a suction fan to remove surplus powder from the specific parts of the bottle and collect the resin powder. When the bottle 1 electrostatically coated with pulverized resin in the chamber 5 is conveyed to the suction slit device 21, the chuck 3 of the holding device 2 is rotated by an appropriate means, thus removing the powder from the specific parts including the head and/or botton of the bottle.
As can be seen from Figures 6 and 7, the amount of suction draught can be controlled in such a manner as to more satisfactorily raise the suction efficiency depending on the part and shape of the bottle by dividing the suction mouth of upper and lower suction slits 22' and 23' of the surplus powder removing device 21' with partition plates 24 and 25 and providing draught controllers 26 to 31 at each suction mouth. Furthermore, the partition plates 24 and 25 should preferably protrude to a small degree from the suction mouth in such a manner as to function as a spacer between the suction slits and the chuck of the holding device, the top and the bottom of the bottle to retain an appropriate gap between them.
Referring to Figure 6, it is generally preferable to make suction draught rates 32 and 33 relatively high for the purpose of completely removing powder on the chuck 3 of the holding device 2, while the suction draught rate 34 for producing a sharp boundary 35 at the upper end of the pulverized resin layer should be determined depending on the amount of electrical charge and the adhesive force of the pulverized resin layer but is generally made relatively low as compared to the suction draught rates 32 and 33. This situation is also true with regard to suction draught rates 37 and 39 for producing a sharp boundary 36 and a suction draught rate 38 for completely removing surplus powder from the centre part of the bottom of the bottle as shown in Figure 7. That is, the suction draught rates 37 and 39 are relatively low. while the suction draught rate 38 is relatively high. It should be noted that, if desired, the surplus powder-removing system can be optionally applied to parts other than the mouth and the bottom of the bottle.
As can be seen from Figures 8 and 9, the suction slits 22 and 23 may optionally have squeegees 40 and 41 respectively made of an elastic material such as rubber to facilitate the removal of the surplus powder. The suction slits 22 and 23 may also be equipped with an elastic element such as a spring in such a manner as to constantly maintain intimate contact between the squeegee and the chuck or the specific parts of the bottle from which surplus powder is to be removed.
As mentioned above, pulverized resin is electrostatically coated on the surface of a glass bottle in such a manner as to produce a tight pulverized resin layer having a uniform thickness which is well charged and strongly adheres to the glass surface, and surplus powder is satisfactorily removed, thus producing a sharp boundard. The pulverized resin-coated bottle is then post-heated to produce a strong resin film having a uniform thickness on the bottle surface, thereby prolonging the life of the bottle and increas ing its commercial value. Moreover, surplus powder on the holding device is completely removed, and the apparatus can be continuously operated for a long time, thus considerably raising productivity.
The present invention has been illustrated above with regard to electrostatically coating a glass bottle with pulverized resin, but it should be noted that the invention can also be applied to other substantially axially symmetrical objects such as bowling pins.
Also, in addition to synthetic resins, inorganic powders such as enamel frit powders can also be used in the invention.
WHAT WE CLAIM IS;
1. A process for electrostatically coating an object with pulverized material, comprising conveying the object by means of a holding device into an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the chamber, feeding into the chamber pulverized material electrically pre-charged at the same polarity as that of the silent discharge plate electrodes, electrostatically coating the object maintained at a temperature below the melting point of the pulverized maternal with the pulverized material by the action of silent discharge from the said electrodes, and removing surplus pulverized material from specific parts of the object by suction.
2. A process as claimed in Claim 1.
wherein the pulverized material is pulverized synthetic resin.
3. A process as claimed in Claim 1 or 2.
wherein the said object is a glass bottle.
4. A process for electrostatically coating an object with pulverized material, substantially as herein described with reference to
Figures 1 to 5, Figures 1 6 and 7, or Figures 1, 8 and 9 of the accompanying drawings.
5. An object when coated by the process as claimed in any of Claims 1 to 4.
6. Apparatus for elctrostatically coating an object with pulverized material, comprising an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the chamber where the pulverized material is coated on the surface of the object maintained at a temperature below the melting point of the pulverized material.
a holding device for conveying the object into the chamber. a pulverized material feeder having an electrically pre-charging device to electrically pre-charge the pulverized material at the same polarity as that of the silent discharge plate electrodes and to feed the electrically pre-charged pulverized material into the chamber, and a device for removing surplus pulverized material from specific parts of the object by suction, whereby the object is electrostatically coated on desired parts thereof only.
7. Apparatus as claimed in Claim 6 wherein the device for removing surplus pulverized material comprises suction slit openings positioned close to the specific parts of the object from which surplus pulverized material is to be removed.
8. Apparatus as claimed - in Claim 7, wherein the suction slit openings are positioned close to not only the said specific parts of the object but also to a chuck of the said holding device.
9. Apparatus as claimed in Claim 7, wherein the suction slit openings have squeegees made of an elastic material to facilitate the removal of surplus pulverized material.
10. Apparatus as claimed in Claim 9, wherein the said squeegees are made of rubber.
11. Apparatus for electrostatically coating an object with pulverized material, substantially as herein described with reference to, and as shown in, Figures 1 to 5,
Figures 1, 6 and 7, or Figures 1, 8 and 9 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. A process for electrostatically coating an object with pulverized material, comprising conveying the object by means of a holding device into an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the chamber, feeding into the chamber pulverized material electrically pre-charged at the same polarity as that of the silent discharge plate electrodes, electrostatically coating the object maintained at a temperature below the melting point of the pulverized maternal with the pulverized material by the action of silent discharge from the said electrodes, and removing surplus pulverized material from specific parts of the object by suction.
2. A process as claimed in Claim 1.
wherein the pulverized material is pulverized synthetic resin.
3. A process as claimed in Claim 1 or 2.
wherein the said object is a glass bottle.
4. A process for electrostatically coating an object with pulverized material, substantially as herein described with reference to
Figures 1 to 5, Figures 1 6 and 7, or Figures 1, 8 and 9 of the accompanying drawings.
5. An object when coated by the process as claimed in any of Claims 1 to 4.
6. Apparatus for elctrostatically coating an object with pulverized material, comprising an electrostatic coating chamber equipped with silent discharge plate electrodes on both sides of the chamber where the pulverized material is coated on the surface of the object maintained at a temperature below the melting point of the pulverized material.
a holding device for conveying the object into the chamber. a pulverized material feeder having an electrically pre-charging device to electrically pre-charge the pulverized material at the same polarity as that of the silent discharge plate electrodes and to feed the electrically pre-charged pulverized material into the chamber, and a device for removing surplus pulverized material from specific parts of the object by suction, whereby the object is electrostatically coated on desired parts thereof only.
7. Apparatus as claimed in Claim 6 wherein the device for removing surplus pulverized material comprises suction slit openings positioned close to the specific parts of the object from which surplus pulverized material is to be removed.
8. Apparatus as claimed - in Claim 7, wherein the suction slit openings are positioned close to not only the said specific parts of the object but also to a chuck of the said holding device.
9. Apparatus as claimed in Claim 7, wherein the suction slit openings have squeegees made of an elastic material to facilitate the removal of surplus pulverized material.
10. Apparatus as claimed in Claim 9, wherein the said squeegees are made of rubber.
11. Apparatus for electrostatically coating an object with pulverized material, substantially as herein described with reference to, and as shown in, Figures 1 to 5,
Figures 1, 6 and 7, or Figures 1, 8 and 9 of the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13416076A JPS5359738A (en) | 1976-11-10 | 1976-11-10 | Continuous electrostatic powder coating and its equipment |
| JP6897477A JPS543853A (en) | 1977-06-13 | 1977-06-13 | Removing device of excess powder for electrostatidc powder coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1558899A true GB1558899A (en) | 1980-01-09 |
Family
ID=26410158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB46871/77A Expired GB1558899A (en) | 1976-11-10 | 1977-11-10 | Process and apparatus for electrostatically coating with pulverized material |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU508457B2 (en) |
| DE (1) | DE2750370C2 (en) |
| FR (1) | FR2370526A1 (en) |
| GB (1) | GB1558899A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5359737A (en) * | 1976-11-10 | 1978-05-29 | Onoda Cement Co Ltd | Electrostatic powder coating and its equipment |
| US5179910A (en) * | 1991-02-27 | 1993-01-19 | Axis Usa, Incorporated | Apparatus for applying a powdered coating to a workpiece |
| US5326599A (en) * | 1993-02-11 | 1994-07-05 | Nordson Corporation | Cabin purge system for automotive powder coating |
| US6090454A (en) * | 1996-03-28 | 2000-07-18 | E.I. Du Pont De Nemours And Company | Polymer coating for low electrically conductive materials |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES343578A1 (en) * | 1966-07-29 | 1968-12-01 | Sfb Special Filterbau M Ofner | Method and apparatus for Electrostatically Coating the Surfaces of Articles with Pulverulent Materials |
| FR2212765A5 (en) * | 1973-01-03 | 1974-07-26 | Emballage Ste Gle Pour | Electrostatic resin coating of glass articles - using air curtains to prevent fouling of carrying jig |
| US3895126A (en) * | 1973-05-24 | 1975-07-15 | Indian Head Inc | Resin bottle cladding system |
| JPS60108B2 (en) * | 1974-07-10 | 1985-01-05 | 太平洋セメント株式会社 | Electric discharge coating equipment |
| JPS5359737A (en) * | 1976-11-10 | 1978-05-29 | Onoda Cement Co Ltd | Electrostatic powder coating and its equipment |
| DE3125112A1 (en) * | 1981-06-26 | 1983-01-13 | Celamerck Gmbh & Co Kg, 6507 Ingelheim | NEW BENZOTRIAZOLES, THEIR PRODUCTION AND THEIR USE AS FUNGICIDES. |
-
1977
- 1977-11-08 AU AU30449/77A patent/AU508457B2/en not_active Expired
- 1977-11-09 FR FR7733727A patent/FR2370526A1/en active Granted
- 1977-11-10 GB GB46871/77A patent/GB1558899A/en not_active Expired
- 1977-11-10 DE DE2750370A patent/DE2750370C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2750370C2 (en) | 1984-04-12 |
| FR2370526A1 (en) | 1978-06-09 |
| AU3044977A (en) | 1979-05-17 |
| FR2370526B1 (en) | 1984-08-10 |
| AU508457B2 (en) | 1980-03-20 |
| DE2750370A1 (en) | 1978-05-11 |
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