Manufacturing method for a filter core

A manufacturing method of a filter core comprising:

• (a) adhering a wavy filtering sheet and a flat filtering sheet, wherein the wavy filtering sheet is for filtering suspended pollutants and has multiple corrugations and multiple peaks;
• wherein the multiple corrugations of the wavy filtering sheet are formed on the wavy filtering sheet and are axially arranged apart from each other;
• wherein the multiple peaks are formed on the wavy filtering sheet and extend axially;
• wherein the multiple peaks and the multiple corrugations of the wavy filtering sheet are perpendicular to each other in an extending direction;
• wherein the flat filtering sheet is for filtering suspended pollutants and has multiple corrugations;
• wherein the multiple corrugations of the flat filtering sheet are formed on the flat filtering sheet and are axially arranged apart from each other;
• wherein the multiple corrugations of the wavy filtering sheet and the multiple corrugations of the flat filtering sheet correspond to each other in amount, shape and position;
• wherein multiple axial sealing adhesive layers are respectively coated along the multiple peaks of the wavy filtering sheet;
• wherein a first end sealing adhesive layer is coated on a first surface of the wavy filtering sheet and is disposed on one of two axial sides of the wavy filtering sheet;
• wherein the wavy filtering sheet and the flat filtering sheet are adhered with each other, wherein multiple first channels are formed between the first surface and the flat filtering sheet, and wherein the multiple corrugations of the wavy filtering sheet and the multiple corrugations of the flat filtering sheet form concave and convex portions on inner walls of the first channels;
• (b) slit-cutting the adhered filtering sheets, wherein the adhered filtering sheets are cut into a desired length, wherein in slit-cutting, the adhered filtering sheets pass a first upper guiding roller and a first lower guiding roller in sequence, wherein the adhered filtering sheets shift direction to incline downward when passing the first upper guiding roller, and wherein the adhered filtering sheets are cut at a position where the adhered filtering sheets shift direction;
• and
• (c) rolling the slit-cut filtering sheets, wherein a second end sealing adhesive layer is coated on a second surface of the wavy filtering sheet and is disposed on another of the two axial sides of the wavy filtering sheet;
• wherein the filtering sheets are rolled into a shape of a cylinder to form a cylindrical filter core, wherein multiple second channels are formed between the second surface and the flat filtering sheet, and wherein the multiple corrugations of the wavy filtering sheet and the multiple corrugations of the flat filtering sheet form concave and convex portions on inner walls of the second channels.