The invention relates to a screen apron used for a compression device of a spinning machine. The screen apron has fabrics made of a plurality of filaments, and is perforated in at least 10% defined free area in a fiber transport area (F), so that an inhaling air flow (S) can influence fiber bundles (3) moving on the screen apron. Compared with circular surfaces, the surfaces of the plurality of filaments in contact with the fiber bundles (3) are planished in the fiber transport area (F), thus compared with the circular surfaces, the fiber bundles (3) will move more easily on the surface of the screen apron.