Abstract
1. Comparison of results on 100% cotton and 100% rayon-staple cords, neither being coated with an adhesive dip, indicates that the former have about 25% better adhesion. Since the advantage cannot be due to the presence of fiber ends protruding from the cord in one case and not the other, it is concluded that the superior adhesion of the bare cotton cord is in part due to a surface chemical or geometric property of the cotton fiber.
2. Comparison of results on 100% rayon-staple and continuous-filament cords, obtained from the same supplier, show that the staple-fiber product has about 60% better adhesion than the continuous-filament cord. This result indicates that, as has been frequently claimed in the litera ture, the presence of fiber ends in a tire cord does contribute toward improving adhesion. A 100% improvement in adhesion would be required, however, to show that only the lack of fiber ends curtails the adhesion of bare, conventional rayon cords.
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