Abstract: A predetermined pattern of impervious material is deposited on a sheet of coarse, self-cohesive filter material. The impervious material is fusible and adapted to be bonded to the filter material. The pattern of impervious material is such that when the sheet material is coiled into a filter rod and fused at least one antispin band will be formed in the rod located such that there are no interconnecting cavities between the coiled layers of sheet material. Additionally, at least one annulet plug will be formed in the rod and at least one disc plug will be formed in the rod. The outer diameter of the disc is at least as great as the inner diameter of the annulet to thereby provide a tortuous filter path for high efficiency and low pressure drop filtering procedures.

Abstract: A ventilated filter for a smoking product, particularly a smoking tobacco product, is provided by adhering inherently porous tipping wrap to inherently porous plug wrap by a multiplicity of randomly positioned, nonporous discrete areas of adhesive, thus leaving open areas for the air to enter the filter. Production of the porous filter can be accomplished by observing proper adhesive viscosities and solids weight content and by ensuring the adhesive is applied on the applicator in a film having the appropriate depth and on the tipping paper in the appropriate amount per unit area.