| 摘要 |
The assembly of axially-adjacent layers is made separately from the carcass reinforcement preform. Fabrication comprises placing a layer of reinforcement sections (1) orientated at e.g. 10 deg or more on a drum of radius R. The layer is stretched by increasing drum radius. A cylindrical collar is formed by two layers of cords crossed at an angle of 10 deg or more. The assembly of axially-adjacent layers is made separately from the carcass reinforcement preform. Fabrication comprises placing a layer of reinforcement sections (1) orientated at e.g. 10 deg or more on a drum of radius R. The layer is stretched by increasing drum radius. A cylindrical collar is formed by two layers of cords crossed at an angle of 10 deg or more. Drum radius is increased once more, reaching a reinforcement cord angle beta the crossed cords moving in the manner of a pantograph. Assembly of adjacent layers is completed and the assembly taken off the stretching drum. It is placed on the construction drum for the cylindrical carcass reinforcement preform. Preferred features: Formation of the collar with two crossed layers (which in this case result from folding-over), is completed after placing a single layer of crossed cords orientated at angle alpha on a drum of radius R during the first stage. Location is followed by stretching the layer (1) to radius R1. Formation of two layers is achieved by folding one part of the layer (1) over its other part, on the drum of radius R1. In a variant of the process, formation of a collar of two layers (which in this case are separate rather than folded) is accomplished after the initial stage of placing two layers (1, 1') independently of each other, on two separate fitting drums of radii R and R'. Location is followed by increasing radii to take account the thickness of a layer. The formation of two layers is completed by transfer and superposition of one layer (1') on the other (1), on the drum with radius R1. Further variants are described, summarized by folded stretched double layers.
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