water employed in place of the pressure air as described in the foregoing in accordance with the present invention fluid pressure such as water or a gas is arranged to spout in to the pressed contact area between the rubber seal rolls and the seal plates in the rotating direction of the seal rubber rolls thus the pressure fluid is gradually taken in between the seal rubber rolls and the seal plates the pressure fluid taken in between the seal rubber rolls and the seal plates has a lubricating effect on the rotation of the rubber seal rolls to enhance the wear resistance of the rubber seal rolls water or pressure air not exceeding 100 u00b0 c is thus employed as a lubricant for the purposes of obtaining the above states lubricating effect protecting the cloth material from being soiled and economization of heat energy when water is used for this purpose moisture is imparted to the seal rubber rolls and the seal plates for a lubricating effect when pressure air not exceeding 100 u00b0 c is used the temperature of the pressure air is lower than the temperature of gas 102 u00b0 c or above of the inside of the steamer body therefore collision between the pressure air of less than 100 u00b0 c and the gas within the drum body of 102 u00b0 c or above produces highly humid air which sticks to the seal rubber rolls and the seal plates to give a lubricating effect the surplus portion of the.