Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-12-21
1997-12-23
Knable, Geoffrey L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156123, 156126, 1561307, 156133, 1564062, B29D 3016
Patent
active
057003394
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the manufacture of a tire having at least one carcass reinforcement which is formed of plies of cords or cables and, more particularly, a process for building the toroidal blank of the tire.
The process most generally used in order to manufacture a tire for a vehicle wheel consists essentially first of all in applying, one after the other around a cylindrical building drum, the different layers of rubber mixes and the different plies of cords or cables which will constitute the carcass reinforcement of the unvulcanized toroidal tire blank and of the tire itself; said carcass plies being in most cases anchored at each axial end of the drum to an annular metal reinforcement or bead wire.
In the case of a tire having a carcass reinforcement which is formed of plies of bias cords or cables, the second step consists in applying to the central zone of the unvulcanized cylindrical carcass blank the tread reinforcement plies, if any, or tread reinforcement plies, which are formed of cords or cables which are generally crossed from one ply to the next. After the laying of said reinforcement, and the laying of the tread on the latter, the last step in the manufacture of the toroidal blank consists in imparting to it, before vulcanization, the shape of a torus which is very close to that of the finished tire. This operation, which is known as the shaping of the cylindrical blank, is carried out either on a building drum or in the vulcanization mold itself.
In the case of a tire with radial carcass reinforcement, the second step consists in transforming the unvulcanized cylindrical carcass blank by shaping into an unvulcanized toroidal blank, and the last step then consists in placing on the central part of the toroidal blank a tread reinforcement, the layers of rubber mixes necessary and, in particular, the tread.
Despite the care taken in the carrying out of all of the operations described, despite the numerous verifications effected on the starting products, on the semi-finished products, and on the finished toroidal blank, and despite the numerous verifications on the manufacturing machines and the manufacturing steps, the verifications effected on the finished vulcanized tires show the presence of a number of abnormalities with respect to the position of the products, concerning in particular the lower region, for which abnormalities no satisfactory explanations are found. Furthermore, as is known, such processes require, before their assembly, the separate manufacture of the plies of cords or cables by means of large machines and with a large number of operations, and they are therefore expensive.
In order to remedy the above-mentioned drawbacks, that is to say improve the quality of the finished tire and decrease the cost of manufacture of said tire, a new process for the manufacture of a tire is based, in accordance with the present invention, on the principle that the sidewall regions and the bead regions of the blank must be built and handled in the same geometrical configuration as that which they will have in the vulcanization mold.
For the building of a carcass reinforcement, one can use the helicoidal winding of a cord or cable on a foldable and/or disassemblable annular core, followed by a cutting of the torus thus formed and removal of the toroidal reinforcement blank from the building core. Such a manner of manufacture is described in U.S. Pat. No. 1,316,104.
U.S. Pat. No. 3,975,490 describes a method of manufacturing a tire in two or three parts. If the tire is in three parts, two premolded reinforced parts comprise the beads, the sidewalls and the reinforced bands, support of the tread, the third part being the tread itself. This patent mentions the possibility of building the two reinforced parts by winding rubberized woven strips around a toroidal core of circular cross section and separating said blank into two sections by cuts. Enormous difficulties are encountered in producing the reinforcements, in particular of the reinforced bands by winding, in
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patent: 5171394 (1992-12-01), Laurent
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Knable Geoffrey L.
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