Smoking article filter and insertable filter unit therefor
A smoking article filter ( 20 ) comprises a recess ( 25 ) to receive a filter insert unit ( 30 ). The filter insert unit ( 30 ) is secured to the filter ( 20 ) once inserted. The filter ( 20 ) and the filter insert unit ( 30 ) may comprise additives such as flavourants, colourants or sorbents.
1. An insertable filter unit for a heat-not-burn product, the filter unit comprising:
a modifying substance; and
a mechanical retaining means to retain the insertable filter unit in the heat-not-burn product;
wherein the mechanical retaining means comprises a structure that retains beyond what may be achieved by ordinary frictional contact between two substantially flat surfaces in contact; and
the insertable filter unit comprises tobacco.
2. The insertable filter unit according to claim 1 , wherein the mechanical retaining means comprises at least one of a barb and a screw thread.
3. The insertable filter unit according to claim 1 , wherein the insertable filter unit is an insertable spike.
4. The insertable filter unit according to claim 1 , formed from a manually compressible material.
5. The insertable filter unit according to claim 1 , wherein the retaining means comprises an adhesive.
6. The insertable filter unit according to claim 1 , wherein the modifying substance is stored in a frangible capsule contained within the insertable filter unit.
7. The insertable filter unit according to claim 6 , wherein the frangible capsule contains water.
8. The insertable filter unit according to claim 6 , wherein the modifying substance is in at least one of granule form and thread form.
9. The insertable filter unit according to claim 6 , wherein the modifying substance comprises a carbon adsorbent.
10. The insertable filter unit according to claim 9 , wherein the carbon adsorbent has a monolithic structure.
11. The insertable filter unit according to claim 1 , comprising a colorant.
12. The insertable filter unit according claim 1 , wherein the modifying substance comprises at least one of a flavorant and water.
13. The insertable filter unit according to claim 12 , wherein the flavorant comprises at least one of: menthol, lemon, orange, lime, coffee and tea.