Method for the production of filter structure for cigarette filters
OwnerErnest Goavecinventor
Life of this patent
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Abstract
The present invention relates to a method for assembling a highly efficient cigarette filter by making a new type of filter structure starting with a sheet of fiber material, this sheet being shaped as a cylindrical casing according to known geometric shaping arrangements. More particularly, according to this method there is employed a sheet of fiber material which is transversally corrugated and which acts as an absorbent with regard to the products of tobacco smoke, and, there is impressed on certain portions of this sheet a wafer relief configuration so as to obtain on this sheet two different materials, the sheet is then cut into ribbons of the same width which are gathered in the form of a pile, said pile being then geometrically shaped in a cylindrical casing of homogeneous structure.
Claims8
A method of forming a continuous cylindrical filter casing for cigarettes comprising:
- a. continuously paying out an endless sheet of absorbant fibrous material with transverse corrugations;
- b. rigidifying a series of first shaped portions of the sheet so as to define a predetermined geometric configuration which is repeated in the sheet longitudinal direction in accordance with a first repetition sequence and in the sheet transverse direction in accordance with a second repetition sequence, this rigidity being obtained by crushing corrugation ribs and forming on said first portions fine waffle-like longitudinal flutings, while leaving intact corrugated material of second portions of the sheet;
- c. continuously cutting out lengths of ribbon in the longitudinal direction of the sheet of equal width, such that the segments of said first and second portions of each cut-out ribbon forms a motif repeated in the longitudinal direction of the ribbon in accordance with the longitudinal repetition sequence of the sheet;
- d. continuously pivoting these ribbons by 90.degree. over their central axis;
- e. assembling these ribbons to form a ribbon pile so that the segments of each ribbon located in this pile between two perpendicular planes in the longitudinal direction of the ribbon and of a longitudinal dimension equal to the first repetition sequence of the motif is uniformly repeated in the longitudinal direction of the ribbon, the relationship between the width of the ribbons and said second repetition sequence being selected such that, for two continuous ribbons of the pile, the first portions of a first ribbon in certain locations contact the first portions of the second ribbons and in other locations contact the second portions of the second ribbon;
- and,
- f. continuously curving the pile of ribbons so as to have it conform to a cylindrical casing.
Dependencies are inferred from the claim text.