Thin cigarette groove filter stick and thin cigarette groove composite filter stick

The utility model discloses a thin cigarette groove filter stick which is composed of a piece of forming paper, a piece of thin cigarette groove cellulose paper and a filter element. The number of thin cigarette groove pairs ranges from 12 to 22. Thin cigarette groove teeth are trapezoid teeth or rectangular teeth. The pressing depth of each thin cigarette groove ranges from 0.35 mm to 0.50 mm. All the thin cigarette grooves or part of the thin cigarette grooves can be discontinuous in the length direction. The thin cigarette grooves can be straight line grooves parallel to the axis of the filter stick or inclined line grooves, wherein a certain angle is formed between the central axis of the filter stick and the inclined line grooves. The gram weight of the thin cigarette groove cellulose paper ranges from 50 g/m to 90 g/m when the grooves are not pressed in the thin cigarette groove cellulose paper. When the thin cigarette groove teeth are the trapezoid teeth or the rectangular teeth, the width of the bottom openings of the protruding grooves is smaller than the width of the bottom edges of the concave grooves. The thin cigarette groove filter stick can be split and spliced to form a thin cigarette groove composite filter stick. The thin cigarette groove filter stick has the advantages of being low in suction resistance and stable in pressure drop, having the cost lower than that of an ordinary groove filter, being good in appearance quality and the like.