This is a study for the optimal design of rubber coating on a mangle roll used in the textile processing industry. The rubber coating is crowned (convex shaped) on the roll to apply even pressure on the textile. An analysis of the contact pressure on the roll surface was conducted to find the affects of the geometry of the rubber crown, the friction coefficient, the load variation at the roll and the following results were obtained. 1) The friction coefficient does not have much of an affect on the distribution of the contact pressure. 2) The optimal shape of the roll depends on the amount of the load necessary at the roll. The ratio of the rubber thickness at both ends of the roll to the center (RU1/RU2) decreased as the load increased.