Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Anti-stick or adhesion preventing coating
Patent
1998-11-04
2000-06-20
Mackey, James P.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Anti-stick or adhesion preventing coating
264315, 264326, 425 38, 425 96, B29C 3358, B29C 3502
Patent
active
06077469&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the field of tire manufacture and more particularly, the invention relates to a system and method for pre-spraying a bladder release a green tire onto the interior surface of a tire and then applying a bladder release between a green tire and an inflatable bladder in a tire molding machine.
In the manufacture of tires, typically used for automobiles and trucks, a green tire (one which is already formed but not cured) is placed in an open mold within a conventional tire pressure molding machine. The tire is positioned about a deflated inflatable bladder disposed within the mold section of the molding machine. After, the tire mold is closed and sealed, the inflatable bladder is inflated to force the green tire against the heated mold walls whereby the tire is formed with a tread pattern. After some period of time, the tire is cured, the inflatable bladder is deflated, the mold is opened, and the now cured tire ejected from the mold. In the past, the inflatable bladder sometimes stuck to the tire after the molding operation was completed and the inflatable bladder was deflated. Then, a machine operator would have to manually separate the inflatable bladder from the interior wall of the tire before the completed tire could be ejected and a new green Lire inserted. This caused a costly, time consuming delay in the manufacturing process.
To overcome this problem, a machine operator would often spray a coating of bladder release to either the inside surface of the green tire and/or the inflatable bladder with a paint gun prior to loading the green tire within the pressure molding machine and inflating the inflatable bladder. While this technique was effective to insure that the inflatable bladder would separate from the cured tire when the molding process was completed, it was still time consuming because it required the machine operator to individually spray each tire or inflatable bladder before the green tire was loaded into the molding machine. Further, the machine operator had to carefully apply the bladder release to ensure that the bladder release completely covered the interface surface between the tire and the inflatable bladder so that the inflatable bladder wouldn't stick to a section of tire. Besides being a costly, time consuming process, which could possibly slow the production of tires, it was also subject to operator error. These errors include not every tire being sprayed, inconsistencies in application of the bladder release causing the inflatable bladder to stick against uncoated sections of the tire, and overspray of the bladder release. Oversprayed bladder release typically resulted from the pressure of the bladder release being sprayed on the inflatable bladder. The excess bladder release often got into the mold and contaminated the mold walls, especially because of the tendency for dirt to cling to the viscous bladder release. This contamination often necessitated stoppage of the tire production line to clean the molds, another time consuming, and costly delay. Furthermore, the system was not adaptable to modern manufacturing techniques where the entire process is handled by machines and robots.
It became apparent that an apparatus and method of operating the apparatus was needed to prevent the sticking of the inflatable bladder to the inside walls of cured tires without the attention of a machine operator arid the time delays and costs associated therewith.
It is an object of the present invention to provide a system and method for applying a bladder release between a green tire and an inflatable bladder in a tire molding machine which obviate the problems and limitations of the prior art systems.
It is a further object of the present invention to provide an improved system and method for applying a mist or spray of bladder release between a green tire and an inflatable bladder in a tire molding machine after the green tire has already been loaded within the tire molding machine.
It is a still further object of the present invention to prov
REFERENCES:
patent: 3640653 (1972-02-01), Laenen et al.
patent: 4329265 (1982-05-01), Hallenbeck
patent: 4778060 (1988-10-01), Wessner, Jr.
patent: 5205378 (1993-04-01), Boelkins
Coyne Michael Scott
Crisp Stanley Albert
Golightly Ralph Wayne
Newman James Elmo
Cohn Howard M
Mackey James P.
The Goodyear Tire & Rubber Company
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