Method for coating spark plug threads with a polytetrafluoroethylene mixutre
AssigneeKevin Stewart
InventorKevin Stewart
Life of this patent
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Abstract
The invention relates to a method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.); (b) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (0.146 mm openings); (c) applying a minimum dry film thickness of 20 microns to 30 microns (0.8 mil to 1.2 mil) to the spark plug thread; and (d) baking the spark plug for 15 minutes at a metal temperature of 232° C. to 260° C. (450° F. to 500° F.).
Claims6
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.);
- (b) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (0.146 mm openings);
- (c) applying a minimum dry film thickness of 20 microns to 30 microns (0.8 mil to 1.2 mil) to the spark plug thread;
- and
- (d) baking the spark plug for 15minutes at a metal temperature of 232° C. to 260° C. (450° F. to 500° F.).
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.);
- (b) cleaning the surface of the spark plug by using a vapour degrease or by prebaking;
- (c) lightly grit-blasting the surface of the spark plug with aluminum oxide (e.g. 120-180 microinches);
- (d) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (0.146 mm openings);
- (e) applying a minimum dry film thickness of 20microns to 30 microns (0.8 mil to 1.2 mil) to the spark plug thread;
- and
- (f) baking the spark plug for 15 minutes at a metal temperature of 232° C. to 260° C. (450° F. to 500° F.).
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.);
- (b) cleaning the surface of the spark plug by using a vapour degrease or by prebaking;
- (c) applying one or more conversion coatings for corrosion protection;
- (d) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (0.146 mm openings);
- (e) applying a minimum dry film thickness of 20 microns to 30 microns (0.8 mil to 1.2 mil) to the spark plug thread;
- and
- (f) baking the spark plug for 15 minutes at a metal temperature of 232° C. to 260° C. (450° F. to 500° F.).
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.) and mixing or rolling thoroughly at 30 rpm for 30 minutes to 60 minutes;
- (b) stringing the polytetrafluoroethylene mixture thorough a 100-mesh stainless steel screen (0.146 mm openings);
- (c) using conventional industrial air-assisted spray equipment to apply a minimum film thickness of 20 microns (0.8 mil) to the spark plug thread;
- and
- (d) baking the spark plug for 15 minutes at a metal temperature of 370° C. for 10 minutes or 400° C. for 5 minutes.
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.);
- (b) cleaning and degreasing the surface of the spark plug by gritblasting to achieve a Ra of 2.51 microns (110-125 M in) maximum;
- (c) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 60-mesh stainless steel screen (250 mm openings);
- (d) applying a minimum dry film thickness of 25 microns to 100 microns (1.0 mil to 4.0 mil) to the spark plug thread;
- and
- (e) baking the spark plug for 20-30 minutes at a metal temperature of 370° F. to 370° F.).
A method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of:
- (a) bringing the spark plug to room temperature of 21° C. to 26° C. (70° F. to 79° F.);
- (b) mixing the polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (250 mm openings);
- (c) using conventional industrial spray equipment applying a minimum dry film thickness of 25 microns to 100 microns (1.0 mil to 4.0 mil) to the spark plug thread, agitating during use of sprayed from a pressure pot;
- and
- (d) baking the spark plug for 30 minutes at a metal temperature of 725° F.
Dependencies are inferred from the claim text.