US4086872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic coating with post charger web or coil coating and powder feed
Assignee: Continental Group Inc
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Filing: 1977-04-21
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Granted: 1978-05-02
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Expires: 1997-04-21
Abstract
Abstract A system and process for electrodynamic powder coating of conducting and non-conducting substrates using an electrodynamic fluidized bed. The system generally includes a coating applicator means for applying charged particles to the substrate to be coated, and postcharging means for applying to the substrate an additional charge of such polarity as to cause an increase in the electrostatic forces holding the coating particles to the substrate. The system further includes a precharging means for precharging the substrate with a charge of such polarity as to effect more uniform coating of the substrate and a higher rate of coating. Where the substrate to be coated is a continuous web, the system includes a conveying means for conveying the web through the various positions adjacent to the three aforementioned means. The coating applicator means may be an electrodynamic coating apparatus of the electrodynamic fluidized bed type and comprising a fluidized bed means and a charging bed means with a porous wall positioned therebetween, and a recharging means.
Inventors
- 👤 Peter Naw Yank Pan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/14; B05D3/141; B05D3/145; B05C; B05C19/00; B05C19/02; B05C19/025; B05D1/00; B05D1/18; B05D1/22; B05D1/24; B05D3/142; B05D1/007; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
An electrodynamic coating system for coating a substrate, comprising in combination: coating applicator means disposed adjacent to said substrate for applying thereto charged particles of a given polarity so as to produce electrostatic forces attracting and holding said charged particles to said substrate; and postcharging means disposed downstream of said applicator and adjacent to said substrate for applying thereto a charge of said given polarity whereby to effect an increase in the electrostatic forces holding said applied particles to said substrate.
Claim 2
Dependent Claim
81 words
An electrodynamic coating system for coating a substrate, comprising in combination: coating applicator means disposed adjacent to said substrate for applying thereto charged particles of a given polarity so as to produce electrostatic forces attracting and holding said charged particles to said substrate; and postcharging means disposed downstream of said applicator and adjacent to said substrate for applying thereto a charge of said given polarity whereby to effect an increase in the electrostatic forces holding said applied particles to said substrate.
Claim 3
Dependent Claim
24 words
A system as recited in claim 1 wherein said post-charging means comprises a plurality of corona pins and a high voltage source connected thereto.
Claim 4
Dependent Claim
24 words
A system as recited in claim 1 wherein said postcharging means comprises at least one charging wire and a high voltage source connected thereto.
Claim 5
Dependent Claim
29 words
A system as recited in claim 1 wherein said postcharging means includes a groundplane electrode and a plurality of corona pins disposed, respectively, on opposite sides of said substrate.
Claim 6
Dependent Claim
17 words
A system as recited in claim 4 wherein said groundplane electrode comprises a pluraity of corona pins.
Claim 7
Dependent Claim
17 words
A system as recited in claim 4 wherein said groundplane electrode comprises at least one charging wire.
Claim 8
Dependent Claim
37 words
A system as recited in claim 1 wherein said substrate is a continuous web and including conveying means for conveying said web successively to positions adjacent to said coating applicator means and to said postcharging means, respectively.
Claim 9
Dependent Claim
27 words
A system as recited in claim 7 wherein said conveying means includes non-conductive rollers whereby to eliminate image force attraction of said charged particles from said web.
Claim 10
Dependent Claim
44 words
A system as recited in claim 1 including precharging means disposed adjacent to said substrate for precharging said substrate with a charge of polarity opposite to said given polarity whereby to obtain more uniform coating of said substrate and a higher rate of coating.
Claim 11
Dependent Claim
24 words
A system as recited in claim 9 wherein said precharging means comprises a plurality of corona pins and a high voltage source connected thereto.
Claim 12
Dependent Claim
24 words
A system as recited in claim 9 wherein said precharging means comprises at least one charging wire and a high voltage source connected thereto.
Claim 13
Dependent Claim
34 words
A system as recited in claim 9 wherein said precharging means comprises steam applicator means for applying steam to said substrate so as to cause said substrate to appear to be conductive in nature.
Claim 14
Dependent Claim
44 words
A system as recited in claim 9 wherein said substrate to be coated is a continuous web, and including conveying means for successively conveying said web to positions adjacent to said precharging means, to said coating applicator means, and to said postcharging means, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |