A method of forming a wrapped article, comprising the steps of: forming a continuous stream of material such as an agricultural product; moving the continuous stream of material along an elongated path; compressing the continuous stream of material to reduce the cross-sectional area thereof until a predetermined cross-sectional dimension is achieved; drawing the compressed continuous stream of material through a rod-forming arrangement, the rod-forming arrangement having a non-contact displacement transducer associated therewith; folding at least one web longitudinally around the compressed continuous stream of material to form a continuous rod of material; and detecting variations in rod density within the rod-forming arrangement from a signal obtained from the non-contact displacement transducer.

Described herein is an aerosol generating article, the article including an aerosolizable material and a wrapping material arranged around the aerosolizable material, wherein the wrapping material includes a non-combustible material and the wrapping material extends from a first end of the aerosolizable material and over about 10% to about 85% of the distance to a second end of the aerosolizable material.

The present invention relates to a method for manufacturing inductively heatable aerosol-forming rods (100). The method comprises supplying a first substrate web (31) and a second substrate web (32) separately to a continuous multiple-stage rod-forming process which comprises at least a first and a subsequent second stage. The method further comprises supplying a continuous susceptor profile (20) to the rod-forming process such that the susceptor profile passes through at least the second stage. Furthermore, the method comprises passing the first and second substrate web separately through the first stage. Thereby, the first and the second substrate web are separately pre-gathered transversely with regard to a respective transport direction of each of the substrate web through the first stage. The method further comprises passing the susceptor profile and the pre-gathered substrate webs through the second stage. Thereby, the separately pre-gathered substrate webs are jointly gathered into a rod shape around the susceptor profile. The invention further relates to a multi-stage rod-forming device (10) comprising at least a first stage (11) and a second stage (12) downstream of the first stage. The first stage is configured for separately pre-gathering a first and a second substrate web (31, 32) respectively as each of them passes through the first stage. The second stage is configured for jointly gathering the pre-gathered substrate webs into a rod shape around a susceptor profile (20) as the susceptor profile and the pre-gathered substrate webs pass through the second stage.

There is provided a method of making rods having predetermined values of cross-sectional porosity, and a cross-sectional porosity distribution value for use as an aerosol-forming substrate in a heated aerosol-generating article, including providing a continuous sheet of aerosol-forming material having a specified width and a specified thickness; gathering the sheet transversely relative to a longitudinal axis thereof; circumscribing the gathered sheet with a wrapper to form a continuous rod; severing the rod into a plurality of discrete rods; determining values of cross-sectional porosity and cross-sectional porosity distribution for at least one of the discrete rods; and controlling one or more manufacturing parameters to ensure that the cross-sectional porosity and cross-sectional porosity distribution values of subsequent rods are within the predetermined values.

There is provided a method of making rods having predetermined values of cross-sectional porosity, and a cross-sectional porosity distribution value for use as an aerosol-forming substrate in a heated aerosol-generating article, including providing a continuous sheet of aerosol-forming material having a specified width and a specified thickness; gathering the sheet transversely relative to a longitudinal axis thereof; circumscribing the gathered sheet with a wrapper to form a continuous rod; severing the rod into a plurality of discrete rods; determining values of cross-sectional porosity and cross-sectional porosity distribution for at least one of the discrete rods; and controlling one or more manufacturing parameters to ensure that the cross-sectional porosity and cross-sectional porosity distribution values of subsequent rods are within the predetermined values.

A method of determining the density of an elongate rod of material as it travels in a longitudinal direction through an inspection zone of apparatus for determining the density of an elongate rod of material is disclosed. The method comprises: positioning an X-ray generator of said apparatus to transmit X-rays in a direction across the elongate rod and towards a detector of said apparatus, as the elongate rod travels in a longitudinal direction through said inspection zone of said apparatus; supplying a voltage to the X-ray generator of between 20 to 80 kV to transmit the X-rays at a predetermined intensity; detecting the intensity of the X-rays transmitted through the elongate rod using the detector, and determining a density of the elongate rod based on a comparison of the predetermined and detected intensities. A method of manufacturing tobacco industry products that includes the above inspection method is also disclosed, together with apparatus for determining the density of an elongate rod of material.

A method of forming a wrapped article, comprising the steps of: forming a continuous stream of material such as an agricultural product; moving the continuous stream of material along an elongated path; compressing the continuous stream of material to reduce the cross-sectional area thereof until a predetermined cross-sectional dimension is achieved; drawing the compressed continuous stream of material through a rod-forming arrangement, the rod-forming arrangement having a non-contact displacement transducer associated therewith; folding at least one web longitudinally around the compressed continuous stream of material to form a continuous rod of material; and detecting variations in rod density within the rod-forming arrangement from a signal obtained from the non-contact displacement transducer.

The invention relates to an apparatus (10) for crimping a sheet (40) of material, the apparatus comprising a first and second facing crimping roller (11, 21) defining a first and second rotation axis, respectively, the first roller including:a first plurality of circumferential ridges (16), each ridge defining a ridge amplitude;wherein each of said first plurality of ridges is interrupted along its circumferential extension forming an interruption gap where for a given interruption angle an amplitude of the ridge differs from the ridge amplitude in the remaining circumferential extension of the ridge;wherein said plurality of interruption gaps forms an interruption band defining a direction of extension, said direction of extension being angled with respect to a direction defined by the first rotation axis of an angle comprised between about 2 to about 25. The invention also relates to a method for crimping a sheet of material as well as a crimped sheet of material and a rod made of a crimped sheet.

The invention relates to an apparatus (10) for crimping a sheet (40) of material, the apparatus comprising a first and second facing crimping roller (11, 21) defining a first and second rotation axis, respectively, the first roller including:a first plurality of circumferential ridges (16), each ridge defining a ridge amplitude;wherein each of said first plurality of ridges is interrupted along its circumferential extension forming an interruption gap where for a given interruption angle an amplitude of the ridge differs from the ridge amplitude in the remaining circumferential extension of the ridge;wherein said plurality of interruption gaps forms an interruption band defining a direction of extension, said direction of extension being angled with respect to a direction defined by the first rotation axis of an angle comprised between about 2 to about 25. The invention also relates to a method for crimping a sheet of material as well as a crimped sheet of material and a rod made of a crimped sheet.

The invention relates to a method or apparatus (10) for crimping a sheet (70) of material The apparatus comprises a transport device to transport the sheet of material along a transport direction (1), and a set of crimping rollers (11, 21). The set comprises a first (11) and a second (21) main crimping roller, defining a first (18) and a second (28) rotational axis and being faced one in front of the other, the first roller including a first plurality of ridges (17) across a portion of its width (16), and the second roller having a second plurality of ridges (27) across a portion of its width; and a pre-crimping roller facing the first roller and having a third plurality of ridges across a portion of its width, the pre-crimping roller having a diameter smaller than a diameter of the first and second main roller.