to carry the dispersed fibrous web forming fibers 28 from the forming header area as an illustration of these principles the following examples compare conventional practice with the method of the present invention in a pilot plant air laid defiberizing unit of conventional design 2 7 lbs of pulp per minute were defiberized in a hammermill the pulp had a 6 7 fiber moisture content i e 0 181 lbs of water per minute were introduced to the hammermill in association with the fibers a make up air stream at 70 u00b0 f and having a relative humidity of 70 was introduced to the hammermill at a rate of 70 acfm recycle fibers were also added to the hammermill the transport air therefor being at 80 u00b0 f and 50 r h and at a flow rate of 400 acfm the water vapor associated with the make up and recycle air streams was calculated at 0 057 lbs min and 0 3223 lbs min respectively hence the total water concentration in the hammermill was 0 5603 lbs min the air temperature exiting the hammermill was 175 u00b0 f and the flow rate about 559 acfm at this temperature the air r h was 3 12 just prior to the former the air temperature had decreased to 120 u00b0 f with a corresponding increase in r h to 20 3 the flow rate was calculated to be 510 6 acfm the moisture content of the fibers was between 2 to 3 by weight to prevent fiber clumping it was necessary to maintain.