Filter Rod Diameter, Circumference & Length Explained
Filter specifications matter because they need to match the cigarette format they’re built for. Our filter making machines cover a range of these specs:
- KDF-1: produces 120mm filters with a circumference range of 16.8mm to 28.1mm and a filter length range of 64mm to 150mm.
- KDF-2: runs at 400 meters per minute, covering the same 64mm to 150mm filter length range.
- Molins PM-5: produces filter rods at a diameter of 7.5mm to 7.8mm and a length range of 108mm to 126mm, at a capacity of 4,000 filters per minute.
If you’re producing King Size, Slim, or Super Slim cigarettes, confirm the filter machine’s circumference and length range actually covers your target format before choosing between models, since a mismatch here means the finished filter won’t fit the rod it’s meant to attach to.
Conventional Filter Rods vs. Hollow Tube Filters
Not every filter is a solid rod of tow from end to end. A hollow tube filter uses a paper tube section, sometimes combined with tow, to build a different kind of filter structure, one increasingly used in modern filter designs that call for a hollow or specialty tube section rather than a fully solid plug.
The KDF-1, KDF-2, and PM-5 are built for conventional, tow-based filter rod production. Our Hollow Tube Maker is a separate, purpose-built machine for producing these paper tube sections, running at up to 2,100 cigarettes per minute with a rod speed range of 140 to 175 meters per minute. If your filter designs rely on hollow tube sections rather than standard solid filter rod, this is a distinct piece of equipment from the conventional filter makers in our range, not an alternative configuration of the same machine.