Method of manufacture of article for delivering health-benefit agent
View Patent ↗A laminate of nonwoven materials having fine particulate matter attached thereto is made with a lamination process capable of supplying up to about 60 gsm of particulate matter to a substrate. The particulate matter may be applied to the substrate using a powder coating apparatus. The laminate may be used in personal absorbent articles such as diapers, feminine pads, bandages, bed pads, and the like.
1. A method for constructing a laminate comprising the steps of:
fluidizing an amount of particulate matter, wherein the particulate matter is selected from the group consisting of menthol, activated charcoal, carbon, xylitol, clay, desiccants, prebiotics, probiotics, surfactants, anti-oxidants, disinfectants, antibacterial agents, antiviral agents, pharmaceutical actives, perfumes, deodorants, opacifiers, astringents, preservatives, and a combination thereof;
creating a base by
conveying at a speed of 30 to 600 meters/minute a first substrate and a second substrate, each having an inner surface and an outer surface;
attaching a first adhesive layer to the inner surface of the first substrate; and
applying an amount of the fluidized particulate matter onto the first adhesive layer;
attaching a second adhesive layer to the first layer of particulate matter;
applying additional fluidized particulate matter onto the second adhesive layer to create a second layer of particulate matter, wherein the additional fluidized particulate matter is selected from the group consisting of menthol, activated charcoal, carbon, xylitol, clay, desiccants, prebiotics, probiotics, surfactants, anti-oxidants, disinfectants, antibacterial agents, antiviral agents, pharmaceutical actives, perfumes, deodorants, opacifiers, astringents, preservatives, and a combination thereof, wherein the first layer of particulate matter is chemically different than the second layer of particulate matter, and wherein at least one of:
(i) the first layer of particulate matter consists of the fluidized particulate matter and the first adhesive layer, and
(ii) the second layer of particulate matter consists of the additional fluidized particulate matter and the second adhesive layer;
creating a cover by attaching a third adhesive layer to the inner surface of the second substrate; and
attaching the base to the cover so that the outer surfaces of the first substrate and the second substrate are exposed.
2. The method of claim 1 wherein the steps of conveying a first substrate and a second substrate, each having an inner surface and an outer surface; attaching a first adhesive layer to the inner surface of the first substrate; and applying an amount of the fluidized particulate matter onto the first adhesive layer to create a first layer of particulate matter are performed in sequential order.
3. The method of claim 1 wherein 8 gsm to 30 gsm of the particulate matter is attached to the first adhesive layer.
4. The method of claim 1 wherein the laminate is constructed at an ambient temperature.
5. The method of claim 1 wherein the other of the at least one of the first layer of particulate matter and the second layer of particulate matter further comprises superabsorbent material.
6. The method of claim 1 wherein the particulate matter is 10 microns to 50 microns in size.
7. The method of claim 1 wherein the particulate matter is 10 microns to 30 microns in size.
8. The method of claim 1 wherein creating a cover by attaching a third adhesive layer to the inner surface of the second substrate includes applying adhesive directly to the inner surface of the second substrate prior to attaching the base to the cover so that the outer surfaces of the first substrate and the second substrate are exposed.
9. The method of claim 1 , wherein 8 gsm to 40 gsm of the particulate matter is applied onto the first adhesive layer with an electrostatic gun to create the first layer of particulate matter, the particulate matter of the first layer being between 2 microns to 120 microns in size.