Smoking articles enhanced to deliver additives incorporated within electrospun microfibers and nonofibers, and related methods
A large variety of electrospun fibers can be produced to encapsulate a large variety of additives within the subcompartments or substructures of the manufactured electrospun fiber. Furthermore, the manufactured electrospun fibers can be electrostatically arranged within a filter component of a smoking article during the manufacturing process. By modifying the various parameters that control the electrospinning process, a diverse set of electrospun fibers can be manufactured that vary in composition, in substructural organization, and in dimension. The electrospun fiber produced by electrospinning comprises at least one type of polymeric material that encapsulates or supports the retention of at least one type of a flavorant or a non-flavorant within the electrospun fiber. A polymeric material provides a supporting structure for encapsulating at least one type of a flavorant or a non-flavorant. The electrospun fibers that can be produced by various electrospinning processes described below include microfibers in a micro-scaled range, nanofibers in a nano-scaled range, and various mixtures of microfibers and nanofibers.
1. A filter component of a smoking article, the filter component comprising:
a plurality of electrospun fibers having an inner core and an outer shell, the electrospun fiber comprising at least one type of flavorant and/or a non-flavorant additive contained in the inner core; and at least one type of polymer,
wherein a substantial portion of the electrospun fibers is arranged in a parallel alignment with respect to the longitudinal direction of the filter component and in parallel alignment with respect to the direction of a mainstream smoke,
wherein the polymer is a sacrificial polymer selected from the group consisting of: polyetherketone, polyoxytrimethylene, poly(alkyl siloxane), poly(butylene adipate), polyacrylate, polyitaconate, poly(ethylene oxide) (PEO), polyglycolide (PGA), polyhydroxybutyrate (PHB), polyhydroxyvalerate (PHBV), and combinations thereof, and
wherein each of the electrospun fibers is a hollow-core, sacrificial shell electrospun fiber comprising:
at least one type of flavorant and/or nonflavorant combined with a first sacrificial polymer that forms the inner core of the electrospun fiber; and
a second sacrificial polymer that forms the outer shell of the electrospun fiber encapsulating the inner core containing the flavorant and/or the nonflavorant and the first sacrificial polymer.
2. The filter component of claim 1 , wherein each of the electrospun fibers has a substantially cylindrical cross-sectional shape, a substantially constant diameter throughout the length of the electrospun fiber, an outer diameter from about 10 nanometers (nm) to about 50 micrometers (μm), and a length from about 1 millimeters (mm) to about 20 millimeters (mm).
3. The filter component of claim 2 , wherein each of the electrospun fibers has an outer diameter from about 10 nanometers (mm) to about 10 micrometers (μm), or from about 20 nanometers (mm) to about 3 micrometers (μm).
4. The filter component of claim 1 , wherein the polymer stabilizes the retention of the flavorant and/or the nonflavorant additive in an initial unsmoked state.
5. The filter component of claim 1 , wherein the sacrificial polymer loses structural integrity by thermal transition and/or chemical decomposition, and wherein the structural integrity is reduced by at least 1% from that of the initial unsmoked state of the filter component.
6. The filter component of claim 1 , wherein each of the electrospun fibers comprises a flavorant selected from the group consisting of menthol, eugenol, spearmint, peppermint, cocoa, vanilla, cinnamon, licorice, citrus flavor, fruit flavors, and a combination thereof.
7. A smoking article comprising the filter component of claim 1 .