The first filter plug comprises a hole and the second filter plug exhibits lower airflow resistance than the first filter plug.

Only when applied on the top mouthpiece of cigarette filter types does it become a part of the filter.

The filter end of a cigarette having a filter attached thereto is photographed to obtain an inspection image, and a circle that is approximate to the peripheral shape of the filter end image within the inspection image is determined.

The invention relates to a cigarette filter tube comprising a filter piece (9) and a cigarette paper tube (13), at least the filter piece (9) being surrounded by a filter lining paper (5).

A cigarette is provided with a filter comprising a filter element of water-disintegratable paper.

A process of producing a cigarette filter comprises the steps of assembly a filter segment comprising a hollow tube with a filter plug 14 at one end thereof and a space 16 adjacent the plug.

An additive material of a filter tip and a preparation method and application thereof.

Filtered cigarettes became popular not before the 1950s.

Filtered cigarettes ended up being popular not prior to the 1950s.

A method and apparatus for the manufacture of non-circular filter-tipped cigarettes.

A method is provided for manufacturing a smoking article from a wrapped tobacco rod and a filter material wrapped to form a filter plug.

A hollow filter tube (12) is produced with a longitudinal seam (14) and a fixed diameter.

The filter strip can be folded in a zig zag or spiral filter section with open section located longitudinally below to form a filter tip.

A filter cigarette includes a rod (1) of smokable material enclosed in a burnable envelope (2) and a filter connected to one end of the rod.

The filter tip can assist the user in rolling by hand a substantially cylindrical or conical cigar or cigarette.