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    • 9. 发明专利
    • CIGARETTE FILTER
    • JPH04252168A
    • 1992-09-08
    • JP40744390
    • 1990-12-05
    • BROWN & WILLIAMSON TOBACCO
    • RITSUKII ARAN GONTASEN
    • A24D3/02A24D3/00A24D3/04
    • PURPOSE: To provide a filter capable of mixing air and smoke and extracting the flavor of the smoke by successively winding a cylindrical porous filter rod, a non-transmissive wrapper and a chip material and providing a groove and a through-hole formed from the top of the chip material on the wrapper. CONSTITUTION: This filter is provided with the cylindrical porous filter rod 12, the non-transmissive wrapper 14 extended from one end to the other end along the rod 12 in a length direction for surrounding the periphery leaving both ends of the rod 12, the groove 20 shorter than the length of the rod 12 opened at one end of the rod 12 on the wrapper. One or more through-holes 23 provided on the groove 20, the plural through-holes provided on the part other than the groove 20, an air non-transmissive chip material 26 extended in the length direction for surrounding the rod 14 and the plural through-holes 30 and 32 provided on the chip material 26 (one or more through-holes 32 are connected to the through-holes 23 of the groove part 20 of the wrapper 14 and the plural through-holes 30 are connected to the through-holes 22 on the wrapper 14).