Filter For Smoking or Vaping Article Comprising a Nonwoven Substrate
The present invention relates to a filter comprising a nonwoven substrate having a low density and comprising natural fibers and a binder. The filter can be used as a filter for a smoking or vaping article.
1 . Filter comprising a nonwoven substrate comprising natural fibers and a binder, in which the natural fibers represent between 70% and 99% by weight of solids of said nonwoven substrate, the binder represents between 1% and 30% by weight of solids of said nonwoven substrate,
characterized in that the nonwoven substrate has a density of between 7 mg/cm3 and 60 mg/cm3.
2 . Filter according to claim 1 , in which the nonwoven substrate has a thickness of between 700 μm and 6000 μm.
3 . Filter according to claim 1 , in which the length of the natural fibers is greater than 10 mm and less than or equal to 150 mm.
4 . Filter according to claim 1 , in which the natural fibers are chosen from wood fibers, leaf fibers, fruit fibers, seed fibers, bast fibers, stalk fibers, reed fibers and mixtures thereof.
5 . Filter according to claim 4 , in which the wood fibers are chosen from lyocell fibers, viscose fibers, and mixtures thereof.
6 . Filter according to claim 4 , in which the bast fibers are chosen from hemp fiber, Indian hemp fiber, jute fiber, kenaf fiber, kudzu fiber, flax fiber, okra fiber, nettle fiber, ramie fiber, and mixtures thereof.
7 . Filter according to claim 1 , in which the binder is a synthetic polymer or copolymer.
8 . Filter according to claim 1 , in which the binder is chosen from a polysaccharide, preferably starch, a cellulose derivative, and mixtures thereof.
9 . Filter according to claim 1 , in which the binder is a polyvinyl alcohol, a polyvinyl acetate, or an ethylene-vinyl acetate.
10 . Filter as defined in claim 1 for smoking article or vaping article.
11 . Smoking article comprising a filter as defined in claim 1 .
12 . Vaping article comprising a filter as defined in claim 1 .
13 . Process for producing a filter for a smoking or vaping article comprising a nonwoven substrate, said process comprising the following steps:
a) forming a rod of nonwoven substrate from a nonwoven substrate,
b) wrapping the rod of nonwoven substrate with a sheet of plug wrap paper,
c) depositing an adhesive line, joining the sheet of plug wrap paper to obtain a rod of filtering material,
d) cutting the rod of filtering material to produce the filter,
wherein the nonwoven substrate is as defined in claim 1 or is obtained by a process comprising the following steps:
i) producing a web from natural fibers by a drylaid process,
ii) introducing the binder into the web, and
iii) drying the web resulting from step ii) to obtain the nonwoven substrate.
14 . Process according to claim 13 in which, after step iii) and before step a), the nonwoven substrate is packed as bobbin, as roll by the spooling process or in paperboard by the festooning process.