Preparing cigarette filters

Claim 3

A method according to claim 1 comprising forming a plurality of circumferentially spaced V-sectioned grooves with a longitudinally extending rib between each groove of each row at least two successive grooves of each adjacent row of grooves, said V-sectioned grooves being so shaped in cross-section that substantially parallel sides are formed on said ribs to maintain uniform flow of smoke through said ribs between adjacent grooves in different rows.

Claim 4

A method according to claim 1 comprising forming grooves of substantially the same length, the grooves of alternate rows being axially aligned, and cutting the filter material at the space between the ends of successive grooves of said alternate rows.

Claim 5

A method according to claim 3 comprising cutting the filter material at the space between the ends of successive grooves of the rows intermediate said alternate rows.

Claim 6

A method according to claim 1 comprising (a) rotating a plurality of wheels, each having at least one rib projecting from the peripheral surface thereof, arranged with their peripheries forming a moving die about said path, and (b) feeding said continuous rod through said moving die to form said grooves in said continuous rod.

Claim 7

A method according to claim 1 .[.in which the continuous rod is enclosed.]. .Iadd.comprising enclosing the continuous rod .Iaddend.in a continuous wrapper and .[.is.]. then .[.cut.]. .Iadd.cutting the wrapped continous rod .Iaddend.into .[.the.]. double filter lengths for joining between two cigarette lengths.

Claim 10

In a method for making ciagarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction tranverse to the axis of the rod, each row comprising a plurality of individual elongated grooves arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each groove of each row overlapping with at least a portion of each of at least two successive grooves of each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof..Iaddend. .Iadd.9. In a method for making cigarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction transverse to the axis of the rod, each row comprising a plurality of individual elongated grooves arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each space between the ends of adjacent grooves in each row being located between the ends of a groove in each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof..Iaddend. .Iadd.10. In a method for making cigarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction transverse to the axis of the rod, each row comprising a plurality of individual elongated grooves of predetermined length arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each space between the ends of adjacent grooves in each row being located between the ends of a groove in each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof.

Claim 11

In a method for making ciagarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction tranverse to the axis of the rod, each row comprising a plurality of individual elongated grooves arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each groove of each row overlapping with at least a portion of each of at least two successive grooves of each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof..Iaddend. .Iadd.9. In a method for making cigarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction transverse to the axis of the rod, each row comprising a plurality of individual elongated grooves arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each space between the ends of adjacent grooves in each row being located between the ends of a groove in each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof..Iaddend. .Iadd.10. In a method for making cigarette filters (a) forming filter material into a continuous rod, (b) feeding said continuous rod of filter material along a predetermined path, (c) shaping the continuous rod by at least one moving die which provides said rod with a plurality of rows of grooves separated by a plurality of continuous elongated ribs adapted for flow of cigarette smoke therethrough in a direction transverse to the axis of the rod, each row comprising a plurality of individual elongated grooves of predetermined length arranged successively in spaced end-to-end relationship with filter material occupying the space between the ends of adjacent grooves in each row, and each space between the ends of adjacent grooves in each row being located between the ends of a groove in each adjacent row of grooves, and (d) cutting the formed continuous rod into individual filter lengths such that none of said grooves in said filter lengths fully extend between opposite ends thereof.