Strip, filter with the strip, method and apparatus for producing the strip

1. A side strip for supporting a side of a filtering member of a filter, the filtering member having a plurality of folds, the strip comprising:

a plurality of first creases protruding from a first surface of the strip and distributed along a first longitudinal side of the strip; and

a plurality of second creases protruding from the first surface of the strip and distributed along a second longitudinal side of the strip;

wherein the first creases of the strip fit between neighboring peaks of the folds of the filtering member, and the second creases of the strip fit between neighboring bottoms of the folds of the filtering member,

wherein the plurality of first creases are able to extend, and the plurality of second creases are able to shrink, such that the strip is bendable towards the second longitudinal side, and

wherein the cross-section of each of the plurality of first creases decreases from the first longitudinal side to the second longitudinal side, and the cross-section of each of the plurality of second creases decreases from the second longitudinal side to the first longitudinal side.

2. The strip according to claim 1 , wherein the plurality of first creases are able to shrink and the plurality of second creases are able to extend, thereby the strip being bendable towards the first longitudinal side.

3. The strip according to claim 1 , wherein the plurality of first creases and the plurality of second creases are protruding towards a same direction.

4. The strip according to claim 1 , wherein the plurality of first creases and the plurality of second creases are alternating along the longitudinal direction of the strip.

5. The strip according to claim 1 , further comprising a first flat portion between each pair of neighboring first creases, and a second flat portion between each pair of neighboring second creases.

6. The strip according to claim 1 , wherein the sum of the lengths of one of the plurality of the first creases and one of the plurality of the second creases are larger than the width of the strip, and each of the length of the first creases and that of the second creases is less than the width of the strip.

7. The strip according to claim 1 , wherein each of the plurality of first and second creases is of a ridge shape.

8. A strip according to claim 1 , wherein the strip is made of polymer material, and the plurality of first and second creases are formed integrally on the strip.

9. The strip of claim 1 , wherein the first surface of the side strip covers a separation space between the folds of the filtering member and is shaped to prevent air from escaping from a side edge of the filtering member.

10. The strip of claim 1 , wherein the strip closes off the side of the filtering member to prevent air leakage from the side of the filtering member.

11. The strip of claim 1 , wherein the first creases cause the strip to be corrugated along the first longitudinal side of the strip.

12. The strip of claim 1 , wherein the first creases have shapes matching protrusions on a roller that processed the strip.

13. A filter comprising:

a filtering member having a plurality of folds; and

a first strip supporting a first side of the filtering member and closing off the first side of the filtering member to prevent air leakage from the side of the filtering member, the first strip comprising:

a plurality of first creases protruding from a first surface of the first strip and fitting between neighboring peaks of the folds of the filtering member, the first creases further extending from a first longitudinal side of the first strip toward a second longitudinal side of the first strip, each of the plurality of first creases having a cross-section that decreases in size from the first longitudinal side toward the second longitudinal side; and

a plurality of second creases protruding from the first surface of the first strip and fitting between neighboring bottoms of the folds of the filtering member, the second creases further extending from the second longitudinal side of the first strip toward the first longitudinal side of the first strip, each of the plurality of second creases having a cross section that decreases in size from the second longitudinal side toward the first longitudinal side,

wherein the first creases are able to extend and the second creases are able to shrink such that the first strip is bendable towards the second longitudinal side of the first strip.

14. The filter according to claim 13 , further comprising:

a second strip supporting a second side of the filtering member; and

adhesive material binding the filtering member with the first strip and the second strip.