Storage and delivery article for highly viscous fluid
View Patent ↗An article having a top sheet, a core layer and, optionally, a barrier layer is configured to provide storage and metered release of a highly viscous fluid to a target surface. The core layer contains an array of three dimensional voids, which may be opened (i.e., apertured) or closed, that are configured to receive and store the fluid, and is formed of a material that is non-absorbent with respect to the fluid.
1. An article for dispensing a highly viscous fluid, comprising:
a core layer containing an array of discrete three dimensional voids, said voids being configured to receive and store said highly viscous fluid, said core layer being formed of a material that is non-absorbent with respect to said highly viscous fluid; and
a porous top sheet over said core layer, said top sheet being in fluid communication with said voids and having openings for permitting discharge of said highly viscous fluid from said voids;
wherein said voids are defined by a plurality of walls that, when urged toward said top sheet, are collapsible in an outwardly direction to allow at least a plurality of said voids to be in fluid communication with each other.
2. The article of claim 1 , wherein said core layer is formed of a three dimensional apertured film.
3. The article of claim 1 , wherein said core layer comprises a three dimensional structure comprising at least walls extending in a Z-direction, said walls defining interior cavities which are fluidly isolated from said voids.
4. The article of claim 1 , further comprising said highly viscous fluid held within said voids, said highly viscous fluid having a viscosity of at least 1000 centipoise.
5. The article of claim 1 , wherein said voids are cylindrically shaped and flared outward proximate front and back sides of said core layer.
6. The article of claim 3 , wherein, on average, the distance between said walls of adjacent cavities is less than the thickness of the core layer when in a non-compressed, resting state.
7. The article of claim 1 , wherein said core layer comprises upper and lower core layers joined to one another.
8. The article of claim 1 , further comprising a barrier layer, said core layer being disposed between said barrier layer and said top sheet.
9. The article of claim 8 , wherein the barrier layer is impermeable to the highly viscous fluid contained in the core layer.
10. The article of claim 8 , said core layer having a back side bonded to a joining side of said barrier layer, said barrier layer closing an open back end of said voids.
11. The article of claim 1 , wherein said top sheet is freely provided over said core layer to permit fluid to flow during discharge from said voids across a backing surface of said top sheet along a separation gap between said top sheet and said core layer.
12. The article of claim 1 , wherein said article is at least part of at least one of: (a) a personal care article to apply said fluid to skin; (b) a dermatological article; (c) an article to apply fluids to skin that hide or reduce stretch marks: (d) a medical article to apply topical medication, disinfectants or a pharmacological; (e) a cleansing article; and (f) a drug delivery article.
13. The article of claim 4 , wherein said core layer discharges at least 70% of said fluid when said core layer is fully compressed during normal use.
14. The article of claim 1 , said top sheet and core layer having a separation gap therebetween into which said fluid flows during discharge.
15. The article of claim 14 , wherein fluid communication exists among the voids, openings of said top layer and separation gap.
16. The article of claim 5 , wherein said voids have a height greater than their diameter.