Pleated air filter pack and air filter using same

A pleated air filter pack comprising:

• a filter medium having projections on front and rear surfaces thereof,
• wherein the filter medium is a non-woven fabric and folded in zigzag shape along creases of pleats such that opposing projections are brought into direct contact with each other when the filter medium is folded, thus maintaining intervals between folds of the filter medium, wherein the widths of the plurality of dot embossed projections aligned in the MD direction increase as the projections go from the valley toward the ridge of the crease of the pleat.

A pleated air filter pack comprising:

• dot embossed projections provided on front and rear surfaces of a filter medium made of a non-woven fabric, the filter medium is folded in zigzag shape along creases of pleats, and the opposing embossed projections are brought into contact with each other when the filter medium is folded, thus maintaining intervals between the filter media,
• wherein the forms of the opposing dot embossed projections are not symmetrical, and a raised portion and a depressed portion are further formed on each of the projections in contact with each other.