Fiber assembly and method for producing fiber assembly

A fiber assembly comprising:

• a support sheet;
• a warp yarn group in which warp yarns including a polymer material are arranged;
• and
• a weft yarn group in which weft yarns including a polymer material are arranged,
• wherein:
• a surface of the support sheet is release treated;
• the warp yarn group is on the surface of the support sheet;
• the weft yarn group is on the surface of the support sheet;
• the warp yarn group and the weft yarn group define contact portion regions and non-contact portion regions;
• in each of the contact portion regions, at least one of the warp yarns is integrated with at least one of the weft yarns;
• each of the warp yarns has a line width of 1 μm to 10 μm, inclusive;
• each of the weft yarns has a line width of 1 μm to 10 μm, inclusive;
• at least one of the contact portion regions has a fiber density which is higher than a fiber density of at least one of the non-contact portion regions;
• in at least one of the contact portion regions, two of the warp yarns or two of the weft yarns have a spacing of 5 μm or more and 1000 μm or less;
• in at least one of the non-contact portion regions, two of the warp yarns or two of the weft yarns have a spacing of 2000 μm or more;
• average diameters of portions other than a contact portion in which the at least one of the warp yarns is integrated with the at least one of the weft yarns, are defined as a and b respectively;
• an average thickness t of the contact portion is 80% or less of a sum of (a+b);
• and
• in a cross section of the contact portion, the weft yarns extend only in an upward direction above the warp yarns.