Active paper

Abstract

A multi-segment filter comprising a first and second filter segment; wherein the first filter segment comprises a longitudinally extending (e.g., substantially cylindrical) core comprising embossed paper filtering material and/or embossed other biodegradable filtering material with a particulate additive embedded therein; and wherein the second filter segment comprises a longitudinally extending (e.g., substantially cylindrical) core comprising paper filtering material or other biodegradable filtering material.

1 . A multi-segment filter comprising a first and second filter segment;
 wherein the first filter segment comprises a longitudinally extending (e.g., substantially cylindrical) core comprising embossed paper filtering material and/or embossed other biodegradable filtering material with a particulate additive embedded therein; and   wherein the second filter segment comprises a longitudinally extending (e.g., substantially cylindrical) core comprising paper filtering material or other biodegradable filtering material.   
     
     
         2 . The multi-segment filter according to  claim 1  wherein the embossed paper filtering material and/or embossed other biodegradable filtering material of the first filter segment is gathered into rod form and secured in place with a wrapper (e.g., a paper, e.g., a plug wrap) engaged around the rod. 
     
     
         3 . The multi-segment filter according to  claim 2  wherein the wrapper is a paper (e.g., a plugwrap) of basis weight from 25 to 140 gsm, e.g., a paper (e.g., plugwrap) of basis weight from 40 to 120 gsm, e.g., a paper (e.g., plugwrap) of basis weight from 50 to 100 gsm, e.g., a paper (e.g., plugwrap) of basis weight from 60 to 80 gsm, e.g., a paper (e.g., plugwrap) of basis weight of 70 gsm. 
     
     
         4 . The multi-segment filter according to  claim 2  wherein the wrapper is nonporous. 
     
     
         5 . The multi-segment filter according to  claim 2  wherein the wrapper is ventilated or air permeable, with an air permeability of 0 to 32,000 Coresta units. 
     
     
         6 . The multi-segment filter according to  claim 1  wherein the particulate additive is activated carbon (e.g., activated carbon granules), zeolite, ion exchange resin (e.g., a weakly basic anion exchange resin), sepiolite (e.g., sepiolite granules), silica gel, alumina, molecular sieves, carbonaceous polymer resin, a diatomaceous earth, or a mixture of two or more of these additives. 
     
     
         7 . The multi-segment filter according to  claim 1  wherein the particulate additive is of mesh size in the range 12 to 90 (e.g., mesh size 30/70, e.g., mesh size 40/60). 
     
     
         8 . The multi-segment filter according to  claim 1  wherein the loading of the particulate additive is from 1 to 6 mg/mm (e.g., 1 mg/mm, e.g., 2 mg/mm, e.g., 3 mg/mm, e.g., 4 mg/mm, e.g., 5 mg/mm, e.g., 6 mg·mm). 
     
     
         9 . The multi-segment filter according to  claim 1  wherein the embossed paper filtering material and/or embossed other biodegradable filtering material of the first and/or second filter segment is standard paper, non-woven paper, airlaid paper, carbon impregnated paper (i.e., for higher additive loading) or cellulose/lyocell/viscose based papers. 
     
     
         10 . The multi-segment filter according to  claim 1  wherein the embossed paper filtering material and/or embossed other biodegradable filtering material of the first and/or second filter segment is a non-woven paper made with non-plastic plant based fibres (e.g., flax, hemp, jute, sisal, abaca, coconut, bamboo, starch or wood pulp) or a blend of these materials. 
     
     
         11 . The multi-segment filter according to  claim 1  wherein the embossed paper filtering material and/or embossed other biodegradable filtering material of the first and/or second filter segment is comprised of multiple (i.e., more than one) sheets of embossed paper filtering material and/or embossed other biodegradable filtering material. 
     
     
         12 . The multi-segment filter according to  claim 1  wherein the first and/or second filter segment comprises a capsule or capsules (e.g. a frangible capsule) with an additive contained therein. 
     
     
         13 . The multi-segment filter according to  claim 1  wherein the second filter segment comprises a longitudinally extending hollow tube comprising paper filtering material and/or other biodegradable material. 
     
     
         14 . The multi-segment filter according to  claim 1  wherein the length of the multi-segment filter is from 10 to 50 mm, e.g., from 12 to 40 mm, e.g., from 15 to 30 mm, e.g., from 18 to 24 mm. 
     
     
         15 . The multi-segment filter according to  claim 1  wherein the circumference of the multi-segment filter is from 14 to 30 mm, e.g., from 16 to 25 mm, e.g., from 24 to 25 mm. 
     
     
         16 . The multi-segment filter according to  claim 1  wherein the multi-segment filter has ‘Ready Biodegradability’ level of biodegradability as measured according to OECD 301B ‘Ready Biodegradability’ method (modified Sturm test). 
     
     
         17 . The multi-segment filter according to  claim 1  wherein the multi-segment filter exhibits a biodegradation of at least 90% after 6 months as measured according to ISO 14855-1. 
     
     
         18 . The multi-segment filter according to  claim 1  wherein the first filter segment and the second filter segment are abutted together end-to-end. 
     
     
         19 . The multi-segment filter according to  claim 1  wherein the multi-segment filter comprises a wrapper engaged around the first filter segment and second filter segment, wherein the wrapper joins the first filter segment and second filter segment together in longitudinally spaced or abutting alignment. 
     
     
         20 . The multi-segment filter according to  claim 1  comprising one or more discrete further segments. 
     
     
         21 . PNA multi-segment filter according to  claim 20  wherein the one or more discrete further segments is a segment comprising a longitudinally extending (e.g., substantially cylindrical) core comprising paper filtering material or other biodegradable filtering material, which is optionally embossed. 
     
     
         22 . A smoking article (e.g., a cigarette, e.g., a tobacco heating product, e.g., a HNB product) comprising the multi-segment filter according to  claim 1 , or one or more of the multi-segment filter joined to a wrapped tobacco rod (i.e., by a tipping paper) with the end of the first filter segment facing towards the tobacco rod.