US4789565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a thermal fixing roller
Assignee: SWCC Corp
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Filing: 1987-10-21
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Granted: 1988-12-06
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Expires: 2007-10-21
Abstract
Abstract The present invention relates to method for the production of a thermal fixing roller which comprises steps of applying a silicone rubber layer to the surface of a shaft, thereby forming a silicone rubber roller, applying a polytetrafluoroethylene coating to the surface of the silicone rubber roller by immersing the roller in a polytetrafluoroethylene dispersion and rotating the silicone rubber roller in a plane inclined with respect to a horizontal plane, removing the silicone rubber roller from the polytetrafluoroethylene resin dispersion, drying the coating on the outside of the silicone rubber roller at a temperature of at least 500° C. for 10 to 120 seconds, preheating the coating from the inside of the silicone rubber roller, thereby elevating the temperature of the coating to a temperature which is less than that of the melting point of the polytetrafluoroethylene resin, and baking the coating to a temperature which is at least that of the melting point of the polytetrafluoroethylene resin.
Inventors
- 👤 Shuji Kon
- 👤 Yuji Suzuki
- 👤 Toshimitsu Iwata
- 👤 Junichi Fukahori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:32
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D1/00; B05D1/18; B05D3/00; B05D3/02; B05D3/0209; B05D5/00; B05D5/08; B05D5/083; B05D5/086; B05D7/14; B05D7/146; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; B05D2506/00; B05D2506/10; B05D2506/15; B05D2518/00; B05D2518/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
A method for the production of a thermal fixing roller comprising the steps of: (a) applying a silicone rubber layer to the surface of a shaft, thereby forming a silicone rubber roller; (b) applying a polytetrafluoroethylene coating to the surface of the silicone rubber roller by immersing the roller in a polytetrafluoroethylene resin dispersion and rotating the silicone rubber roller in a plane inclined with respect to a horizontal plane; (c) removing the silicone rubber roller from the polytetrafluoroethylene resin dispersion; (d) drying the coating on the outside of the silicone rubber roller at a temperature of at least 500° C. for 10 to 120 seconds; (e) preheating the coating from inside the silicone rubber roller, thereby elevating the temperature of the coating to a temperature which is less than that of the melting point of the polytetrafluoroethylene resin; and (f) baking the coating to a temperature which is at least that of the melting point of the polytetrafluoroethylene resin.
Claim 2
Independent Claim
160 words
A method for the production of a thermal fixing roller comprising the steps of: (a) applying a silicone rubber layer to the surface of a shaft, thereby forming a silicone rubber roller; (b) applying a polytetrafluoroethylene coating to the surface of the silicone rubber roller by immersing the roller in a polytetrafluoroethylene resin dispersion and rotating the silicone rubber roller in a plane inclined with respect to a horizontal plane; (c) removing the silicone rubber roller from the polytetrafluoroethylene resin dispersion; (d) drying the coating on the outside of the silicone rubber roller at a temperature of at least 500° C. for 10 to 120 seconds; (e) preheating the coating from inside the silicone rubber roller, thereby elevating the temperature of the coating to a temperature which is less than that of the melting point of the polytetrafluoroethylene resin; and (f) baking the coating to a temperature which is at least that of the melting point of the polytetrafluoroethylene resin.
Claim 3
Dependent Claim
26 words
The method according to claim 1, wherein said step (b) is carried out in an atmosphere kept at a temperature of not more than 20° C.
Claim 4
Dependent Claim
28 words
The method according to claim 1 or claim 2, wherein said step (b) is carried out in an atmosphere kept at a humidity of not less than 30%.
Claim 5
Dependent Claim
26 words
The method according to claim 1, wherein the polytetrafluoroethylene resin concentration in said polytetrafluoroethylene resin dispersion is in the range of 57 to 60% by weight.
Claim 6
Dependent Claim
25 words
The method according to claim 1, wherein said silicone rubber layer is deposited on the periphery of said shaft in the form of a crown.
Claim 7
Dependent Claim
24 words
The method according to claim 1, wherein an immersion bath is provided with liquid level adjusting means for adjusting the height of liquid level.
Claim 8
Dependent Claim
28 words
The method according to claim 6, wherein said silicone rubber roller is immersed in said polytetrafluoroethylene resin dispersion and pulled out of said bath as kept in rotation.
Claim 9
Dependent Claim
37 words
The method according to claim 1 or claim 7, wherein the rotational speed of said silicone rubber roller after said roller is separated from the liquid phase of said dispersion is lower than that before said immersion.
Claim 10
Dependent Claim
64 words
The method according to claim 1, wherein after said silicone rubber roller is immersed in said polytetrafluoroethylene resin dispersion and pulled out of said dispersion and while said dispersion adhering to said silicone rubber roller is still retaining flowability, said dispersion is drawn toward the opposite ends of said silicone rubber roller from the points near said opposite ends of said silicone rubber roller.
Claim 11
Dependent Claim
32 words
The method according to claim 1, wherein said baking is effected by keeping said silicone rubber roller in a heated atmosphere and having heating means inserted in the shaft of said roller.
Claim 12
Dependent Claim
28 words
The method according to claim 1, wherein said silicone rubber roller having undergone said baking is cooled by passing a liquid coolant through the shaft of said roller.
Claim 13
Dependent Claim
26 words
The method defined in claim 1 wherein said preheating step includes elevating the temperature of the coating to a temperature between 230° C. to 320° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |