confined moisture whic often occurs in the known elastic bands the illustrated example is a disposable diaper but the elasticized units of the present invention can be applied to garments other than diapers for example women 39 s napkins ordinary underwear or materials for industrial use which require gathered effects when the elasticized units are fixed to the sealing sheet 3 it is possible to fit them over the entire surface thereof or at certain intervals the latter will increase the folds on the sealing sheet thereby giving better gathered effects referring to fig5 and 6 there is provided a winder 29 for winding elastic strands e thereon tape members 36 36a and 37 ae supplied onto the elastic strands e as shown in fig6 there is provided a pair of conveyor belts 23 23a above the sealing sheet 3 which belts run in parallel with but in the opposite direction b 39 to the running direction b of the sealing sheet 3 the conveyor belts 23 23a are provided with pins 24 at given spaces whereby the elastic strands are spaced one from another the elastic strands e are supplied fromm the winder 29 through a tension roller 32a to a rotary aram 27 where the strands e are led to an outlet of the arm 27 the arm 27 is rotated in the direction of arrow k about the belts 23 23which rotate in the direction of arrow d.