region and for the marginal regions the paper machine screen of the invention may be produced by subjecting during the manufacture of the screen the longitudinal threads to lesser tension so that in the marginal region the warp tension is less if the screen is woven in ordinary weave if the longitudinal threads are different in the paper region and in the marginal region they may also be woven at equal tension the paper machine screens of the invention cannot be produced on conventional looms for ordinary weave screens if identical longitudinal threads are employed because with the conventional looms all the warp threads are fed from a warp beam so that they are all under equal tension although it is possible to feed each individual warp thread from a bobbin creel the threads then run about a tensioning device consisting of rolls extending across the entire width of the fabric so that they uniformly affect all threads for the manufacture of the paper machine screens of the invention special bobbins or disks are provided beside the warp beam to feed the warp threads for the marginal regions another problem arises from the circumstances that the marginal regions become thicker if the warp threads in these regions are supplied at lower tension or if thicker warp threads are used in the marginal region however it has been surprisingly found that upon setting of the papermaking screen by stretching the marginal regions assume the same thickness as the paper region when equal longitudinal threads are used the marginal regions prior to setting are about 10 to 30 thicker than the paper region on account of the warp woven at lower tension during stretching the marginal regions and the paper region first grew thinner since in the papermaking region the.