Claims
- 1. A system for coating a substrate with a polymer coating comprising, in combination,
- spray nozzle means for dispensing a stream of a stabilized dispersion of polymer in water,
- means for actuating said nozzle means to dispense said stream,
- means for locating said substrate in proximity to said nozzle means such that on actuation of said nozzle means said stream impacts on said surface initially forming a gel coating layer bonded to said surface and caused by destabilization of said dispersion upon said impact, said nozzle means adapted to continuously expose said gelled coating layer to said stream of stabilized polymer dispersion to produce a wet integral coating including a covering layer of polymer dispersion completely covering said gel layer, said gel layer serving as an interfacial layer to adhere said covering layer of polymer dispersion to said substrate, and
- means for drying said wet integral coating to form a substantially completely gelled coating and to coalesce said polymer into a substantially uniform coating onto said substrate.
- 2. The system of claim 1 wherein said means for drying the wet coating is a heater.
- 3. The system of claim 1 further comprising an enclosure for said substrate.
- 4. The system of claim 1 further comprising means for rotating said substrate during actuation of said nozzle means.
- 5. The system of claim 1 wherein said spray nozzle means comprises an hydraulic spray means.
- 6. A system for the continuous coating of plastic bottles with a stabilized dispersion of polymer in water to provide the outside surface of said bottles with a smooth, uniform, uniformly transparent, substantially crack and craze-free polymer coating comprising
- an enclosure for receiving a continuously moving line of said bottles to be coated, said enclosure being open at its ends to permit entrance of the bottles to be coated into the enclosure and exit of the coated bottles from the enclosure,
- spray nozzle means located in said enclosure for dispensing a stream of said polymer stabilized dispersion,
- means for actuating said nozzle means to dispense said stream,
- transport means for moving said bottles continuously into and out of said enclosure and into proximity to said nozzle means such that on actuation of said nozzle means said stream impacts on said surface initially forming a gel coating layer bonded to said surface and caused by destabilization of said dispersion upon said impact, said nozzle means adapted to continuously expose said gelled coating layer to said stream of stabilized polymer dispersion to produce a wet integral coating including a covering layer of polymer dispersion completely covering said gel layer, said gel layer serving as an interfacial layer to adhere said covering layer of polymer dispersion to said bottle surface, and
- radiant heating means for drying said coating on said surface to a substantially tack-free condition without distortion of said bottles.
- 7. The system of claim 6 further comprising means to rotate said bottles in said enclosure and in relation to said heating means.
- 8. The system of claim 6 further comprising means to collect the overspray in said enclosure and return it to said nozzle means.
- 9. The system of claim 8 which provides a material transfer efficiency on the order of about 95% w/w.
- 10. The system of claim 6 wherein said enclosure is provided with means for relative humidity control.
- 11. The system of claim 6 wherein said spray nozzle means comprises an hydraulic spray means.
- 12. A system for coating plastic bottles with a polymer latex comprising
- an enclosure for receiving said bottles to be coated,
- spray nozzle means located in proximity to said enclosure for dispensing a stream of a stabilized dispersion of polymer in water,
- means for actuating said nozzle means to dispense said stream,
- transport means for moving said bottles continuously into and out of said enclosure and into proximity to said nozzle means such that on actuation of said nozzle means said stream impacts on a surface of said bottle initially forming a gel coating layer bonded to said surface and caused by destabilization of said dispersion upon said impact, said nozzle means adapted to continuously expose said gelled coating layer to said stream of stabilized polymer dispersion to produce a wet integral coating including a covering layer of polymer dispersion completely covering said gel layer, said gel layer serving as an interfacial layer to adhere said covering layer of polymer dispersion to said bottle surface, and
- heating means for drying the coating on said bottle surface to a substantially tack-free condition without distortion of said bottle.
RELATED APPLICATION
This is a division of application Ser. No. 500,877, filed June 3, 1983, now U.S. Pat. No. 4,515,836, which is in turn a continuation-in-part of Ser. No. 399,047, filed July 16, 1982, now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2824403 |
Dec 1979 |
DEX |
2014160 |
Jan 1980 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Phillip L. DeLassus, Donald L. Clarke and Ted Cosse, "Saran Coatings on PET Bottles: Application, Performance and Recycle", Revised 3/2/82 (13 pp. article including cover p.). |
Divisions (1)
|
Number |
Date |
Country |
Parent |
500877 |
Jun 1983 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
399047 |
Jul 1982 |
|