Plastic article or earthenware shaping or treating: apparatus – Reshaping – resizing or vulcanizing means for tire – tire...
Reexamination Certificate
1999-05-17
2001-11-27
Mackey, James P. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Reshaping, resizing or vulcanizing means for tire, tire...
C264S236000, C425S058100
Reexamination Certificate
active
06322342
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a tire vulcanization method and a tire vulcanizer for molding green tires by vulcanization.
2. Description of the Related Art
Tires are generally vulcanized by loading a green tire (unvulcanized tire) into a mold of a tire vulcanizing press and blowing a heating medium into the green tire to cause denaturation of rubber by heating.
However, as shown in a cross sectional view of
FIG. 11
, since the thickness of a tire is not uniform, vulcanizing time is determined based on the temperature elevation in a thick walled portion such as a tread part R or a bead part V in order to prevent occurrence of unvulcanized tire in a tire vulcaniing press. Therefore, even when the temperature at the inside and the outside of a side wall part S, that is, a thin walled portion of a green tire reaches a vulcanizing temperature, it has to be waited till the inside of the tread part R or the bead part V as the thick wall portion reaches the vulcanizing temperature. This leads to increase of the production cost due to the loss of heat energy during the waiting period, as well as the cycle time for the tire vulcanization is also prolonged to lower the productivity.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a tire vulcanization method and a tire vulcanizer capable of shortening the cycle time for the tire vulcanization thereby improving the productivity.
In the tire vulcanization method and the tire vulcanizer according to the present invention, primary vulcanization is applied by heating a green tire in a vulcanizing press and secondary vulcanization is applied to the primarily vulcanized tire at the outside of the tire vulcanizing press.
Since the vulcanization molding for a green tire is not applied entirely in the tire vulcanizing press but applied by the primary vulcanization for the green tire and the secondary vulcanization for the primarily vulcanized tire separately, the vulcanizing process can be conducted in parallel, the time for staying the tire at one place is shortened thereby enabling to shorten the cycle time for the tire vulcanization in total.
If the temperature of the primarily vulcanized tire is adiabatically kept in the secondary vulcanizing step, the secondary vulcanization can be conducted with a capacity of heat stored in the primary vulcanization.
Further, it is preferred that substances formed by the vulcanizing reaction of the primarily vulcanized tire are recovered/removed in the secondary vulcanizing step.
After the secondary vulcanizing step, the secondarily vulcanized tire is cooled. The cooling can be conducted by a cooling means disposed separately from or integrally with the secondary vulcanization means. Further, a portion of a plurality of vulcanizing positions having the secondary vulcanization means can also be used as the cooling means.
When the primarily vulcanized tire is heated to an elevated temperature in the secondary vulcanizing step, the vulcanizing reaction for the tire can be promoted. Further, for heating to elevate the temperature of the primarily vulcanized tire, it can be adopted means for blowing air heated by a heat energy of waste gases exhausted from the tire vulcanizing press to the primarily vulcanized tire, means for heating the primarily vulcanized tire by a heater and like other heating means, or a combination thereof.
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(Kobe Steel, Ltd.)
Mackey James P.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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