Aerosol generating article with heat-expandable centering element

Patent metadata

Field	Value
Publication number	US-2020375243-A1
Application number	US-201816766471-A
Country	US
Kind code	A1
Filing date	Dec 6, 2018
Priority date	Dec 7, 2017
Publication date	Dec 3, 2020
Grant date	—

Abstract

An aerosol-generating article for producing an inhalable aerosol when heated is provided, the aerosol-generating article including: a rod of aerosol-generating substrate; a wrapper circumscribing at least the rod; and at least one heat-expandable element disposed on an outer surface of the wrapper. An aerosol-generating system is also provided, including the aerosol aerosol-generating article and an electrically operated aerosol-generating device.

First claim

1 .- 15 . (canceled)

16 . An aerosol-generating article for producing an inhalable aerosol when heated, the aerosol-generating article comprising:
a rod of aerosol-generating substrate; a wrapper circumscribing at least the rod; and at least one heat-expandable element disposed on an outer surface of the wrapper.

17 . The aerosol-generating article according to claim 16 , wherein the at least one heat-expandable element comprises a heat-reactive material.

18 . The aerosol-generating article according to claim 17 , wherein the heat-reactive material is an intumescent reactive material.

19 . The aerosol-generating article according to claim 17 , wherein upon heating the heat-reactive material expands by at least about 1.1 times.

20 . The aerosol-generating article according to claim 16 , wherein the at least one heat-expandable element expands by a factor of between about 10 times and about 100 times its original dimensions when exposed to heat.

21 . The aerosol-generating article according to claim 16 , wherein the at least one heat-expandable element extends about a circumference of the wrapper.

22 . The aerosol-generating article according to claim 16 , further comprising a plurality of heat-expandable elements disposed at distinct locations about a circumference of the wrapper.

23 . The aerosol-generating article according to claim 17 , wherein the heat-reactive material is disposed homogenously about a circumference of the wrapper.

24 . The aerosol-generating article according to claim 17 ,
wherein the at least one heat-expandable element further comprises a first layer comprising a first heat-reactive material and a radially outer second layer adjoining the first layer comprising a second heat-reactive material, and wherein a thermal expansion coefficient of the first heat-reactive material is less than a thermal expansion coefficient of the second heat-reactive material.

25 . The aerosol-generating article according to claim 16 , wherein a distance between the at least one heat-expandable element and a mouth end of the aerosol-generating article is greater than about 50 percent of an overall length of the aerosol-generating article.

26 . The aerosol-generating article according to claim 16 , wherein a thickness of the at least one heat-expandable element in a non-deformed state is at least about 0.05 millimeters.

27 . The aerosol-generating article according to claim 16 , further comprising, in linear sequential arrangement, a support element disposed immediately downstream of the aerosol-generating substrate, an aerosol-cooling element disposed downstream of the support element, the wrapper circumscribing the rod, the support element, and the aerosol-cooling element.

28 . An aerosol-generating system, comprising:
an aerosol aerosol-generating article; and an electrically operated aerosol-generating device comprising a heater and an elongate heating chamber configured to receive the aerosol-generating article so that the aerosol-generating article is configured to be heated in the elongate heating chamber, wherein the aerosol-generating article comprises:
a rod of aerosol-generating substrate,
a wrapper circumscribing at least the rod, wherein an outer diameter of the circumscribed rod is less than an inner diameter of the elongate heating chamber, and
at least one heat-expandable element disposed on an outer surface of the wrapper, the at least one heat-expandable element being configured to deform when heated in the elongate heating chamber such that at least part of the heat-expandable element engages an inner surface of the elongate heating chamber.

29 . The aerosol-generating system according to claim 28 , wherein the heater comprises a substantially cylindrical, elongate heating element and the elongate heating chamber is disposed about a circumferential, longitudinal surface of the heater.

30 . The aerosol-generating system according to claim 28 , further comprising an insulation means arranged between the elongate heating chamber and an exterior of the aerosol-generating device configured to reduce heat loss from heated aerosol-generating substrate.

Assignees

• Philip Morris Products Sa

Inventors

• Duc Fabien
• Malgat Alexandre
• Uthurry Jerome

Classifications

• A24F40/20

  Devices using solid inhalable precursors · CPC title

• A24D1/02 Primary

  with special covers · CPC title

• A24D1/20 Primary

  Cigarettes specially adapted for simulated smoking devices · CPC title

• A24F40/46

  Shape or structure of electric heating means · CPC title

• A24D1/025

  the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity · CPC title