Method of fabricating a filter element

Patent metadata

Field	Value
Publication number	US-10609954-B2
Application number	US-201414900226-A
Country	US
Kind code	B2
Filing date	Jun 20, 2014
Priority date	Jun 21, 2013
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A method of fabricating a smoking article filter element includes arranging a corrugated laminate web around a portion of filter material having an elongate shape and a longitudinal axis, such that the grooves and ridges of the laminate web run in the same direction as the longitudinal axis of the filter material. A method of fabricating a smoking article involves the same method as that of fabricating a smoking article filter element.

First claim

The invention claimed is:

1. A method of fabricating a filter element for use in a smoking article comprising the steps of:
providing a portion of filter material having an elongate shape and a longitudinal axis;
forming a corrugated laminate web having grooves and ridges on one face of the laminate web, the corrugated laminate web comprising a corrugated first web and a non-corrugated second web, wherein the corrugated first web comprises a first end comprising an un-corrugated section running in the same direction as the grooves and ridges;
arranging the corrugated laminate web around the filter material such that the grooves and ridges of the corrugated laminate web, and the un-corrugated section, run in the same direction as the longitudinal axis of the filter material; and
using the un-corrugated section to join the first end of the corrugated laminate web to a second end of the corrugated laminate web to thereby hold the corrugated laminate web in place around the filter material, thus forming the filter element,
wherein the corrugated laminate web is arranged around the filter material so that the face of the corrugated laminate web having no ridges and no grooves is facing the filter material.

2. A method according to claim 1 , wherein the method further comprises a step of preparing the corrugated laminate web, said step comprising providing a corrugated first web and a non-corrugated second web and arranging the corrugated first web and the non-corrugated second web to form a corrugated laminate web.

3. A method according to claim 2 , wherein the step of preparing the corrugated laminate web and the step of arranging the corrugated laminate web around the filter material are part of a continuous process.

4. A method according to claim 1 , wherein the method further comprises a step of storing the corrugated laminate web before the step of arranging the corrugated laminate web around the filter material.

5. A method according to claim 1 , wherein the corrugated first web comprises cellulose acetate.

6. A method according to claim 1 , wherein the non-corrugated second web comprises crepe paper.

7. A method according to claim 1 , wherein the corrugated first web is bonded to the non-corrugated second web.

8. A method according to claim 7 , wherein the corrugated first web is bonded to the non-corrugated second web by adhesive.

9. A method according to claim 1 , wherein the method further comprises arranging one or more additional layers of material around the corrugated laminate web.

10. A method according to claim 9 , wherein the additional layer of material comprises an indexing surface capable of indexing with the grooves and ridges of the corrugated laminate web.

11. A method according to claim 1 , wherein the corrugated laminate web is arranged around the filter material, wherein the filter material is cylindrically shaped having a longitudinal axis, and the corrugated laminate web is arranged so as to completely cover the curved surface of the cylindrically shaped filter material.

12. A method according to claim 1 , wherein the corrugated first web and the non-corrugated second web are the same size and shape, and arranged to provide a laminate in which there are no regions where the corrugated first web does not overlap with the non-corrugated second web.

13. A method of claim 1 , wherein the method further comprises a step of preparing the corrugated first web, which comprises corrugating a flat web to provide said corrugated first web.

14. A method according to claim 1 , wherein the corrugated first web and the non-corrugated second web of the laminate are bonded together at all points in which the corrugated first web and the non-corrugated second web of the laminate are in contact.

Assignees

• British American Tobacco Investments Ltd

Inventors

• Fallon Gary

Classifications

• A24D1/02

  with special covers · CPC title

• A24D3/0287 Primary

  for composite filters · CPC title

• A24D3/025

  Final operations, i.e. after the filter rod forming process (A24D3/0275 takes precedence) · CPC title

• A24D3/043

  with ventilation means, e.g. air dilution (A24D3/041 takes precedence) · CPC title

• A24D3/04

  Tobacco smoke filters characterised by their shape or structure · CPC title