Method for manufacturing mouthpiece lining paper

A method for manufacturing a diffusion-optimized mouthpiece lining paper for tobacco products, comprising:

• perforating a web of said mouthpiece lining paper by a perforation device which produces perforation holes in said web of said mouthpiece lining paper,
• determining diffusivity of said web of said mouthpiece lining paper from at least one parameter of said web that is metrologically acquired downstream of said perforation device, said at least one parameter includes a parameter for a hole size of said perforation holes, and
• determining permeability of said web of said mouthpiece lining paper downstream of said perforation device, and
• minimizing, with a first control loop, the hole size to maximize said diffusivity for carbon monoxide of said mouthpiece lining paper by regulating perforation parameters of said perforation device,
• wherein with a second control loop said permeability of said mouthpiece lining paper is kept constant at a pre-defined nominal permeability of said mouthpiece lining paper by regulating the perforation parameters of said perforation device that are not influencing the hole size.

A method for manufacturing a mouthpiece lining paper for tobacco products, comprising:

• perforating a web of the mouthpiece lining paper by a perforation device, the perforation device adapted to produce perforation holes in the web of the mouthpiece lining paper, the perforation holes having a hole size and a density;
• determining a permeability of the web of the mouthpiece lining paper downstream of the perforation device;
• and
• adjusting the perforating operation to minimize the hole size while maintaining the permeability of the mouthpiece lining paper at a pre-defined nominal permeability.