Non-circular filter core and rolling method thereof

A rolling method of a non-circular filter core comprising steps as follows:

• (a) adhering together a wavy filtering sheet and a flat filtering sheet, wherein the flat filtering sheet used for removing suspended pollutants has a flat leading edge;
• the wavy filtering sheet used for removing suspended pollutants has multiple peaks, a first edge, a second edge disposed opposite to the first edge, a first surface, a second surface disposed opposite to the first surface, and a wavy leading edge;
• the wavy leading edge connects the first edge and the second edge;
• a first end-sealing adhesive layer is coated on the first surface of the wavy filtering sheet and coated along the first edge;
• the flat filtering sheet is adhered to the first surface of the wavy filtering sheet via the first end-sealing adhesive layer;
• (b) coating an edge-sealing adhesive layer, wherein a second end-sealing adhesive layer and the edge-sealing adhesive layer are coated on the second surface of the wavy filtering sheet;
• the second end-sealing adhesive layer is coated along the second edge of the wavy filtering sheet;
• two ends of the edge-sealing adhesive layer extend toward the first edge and the second edge respectively;
• the edge-sealing adhesive layer is connected to the second end-sealing adhesive layer;
• (c) rolling, wherein the wavy filtering sheet and the flat filtering sheet are folded in a direction in which the wavy leading edge and the flat leading edge are toward the edge-sealing adhesive layer, and the wavy leading edge and the flat leading edge are buried in the edge-sealing adhesive layer to adhere together the wavy leading edge and the flat leading edge;
• then the wavy filtering sheet and the flat filtering sheet are rolled such that the wavy filtering sheet and the flat filtering sheet are alternately stacked, and the second end-sealing adhesive layer keeps the wavy filtering sheet and the flat filtering sheet alternately stacked.