Cleaning sheet and process for producing the same

A cleaning sheet comprising:

• a substrate sheet;
• and a plurality of fiber bundles disposed on at least one side of the substrate sheet and made by aggregating fibers oriented in substantially one direction as an open tow, and the width of each fiber bundle is 2 cm to 30 cm wherein:
• each of the fiber bundles is formed by joining the fibers together with a fiber-joining section extending linearly in a direction orthogonal to the orientation direction of the fibers;
• each of the fiber bundles is joined to the substrate sheet by at least one sheet-joining section;
• the entire fiber-joining section or a plurality of fiber-joining sections is not joined to the substrate sheet;
• the sheet-joining section is disposed on the fiber-joining section in perpendicular contact with the fiber-joining section and orthogonally intersects the fiber-joining section;
• a plurality of the sheet-joining sections is disposed intermittently in a direction intersecting the orientation direction of the fibers;
• a longer axis of the sheet-joining section is oriented parallel to the direction of the fibers.