Heavy calendered multiple component sheets and multi-layer laminates and packages therefrom
OwnerMark Miller, Edgar Rudisill +1inventors
InventorsMark Miller, Edgar Rudisill, Edith Triplett
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Abstract
A heavily calendered multiple component sheet is provided by calendering a multiple component nonwoven web formed from multiple component spunbond filaments under conditions that cause the lower-melting component to melt and flow into the interstitial spaces between the spunbond filaments. The calendered sheets are useful in child resistant packaging.
Claims20
A heavily calendered multiple component spunbond sheet comprising continuous multiple component spunbond filaments, the multiple component filaments comprising between about 10 and 90 weight percent of a first lower-melting polymeric component and between about 90 and 10 weight percent of a second higher-melting polymeric component, the first polymeric component comprising at least a portion of the peripheral surface of the filaments, wherein interstitial spaces between the filaments are at least partially filled by the lower-melting component and are substantially free of separately added resin binder, said sheet having an Elmendorf tear measured in both the machine direction and the cross direction of between 0.5 lb and 6.0 lb, a Graves tear measured in both the machine direction and the cross direction of at least 4.0 lb, and a Spencer Puncture of at least 0.70 J.
A blister package comprising a blister component having an inner surface and an outer surface and a lidding component having an inner and outer surface, the lidding component comprising a multi-layer laminate of a spunbond/meltblown/spunbond fabric and a first barrier layer, wherein at least one of said spunbond layers is a heavily calendered multiple component spunbond sheet comprising continuous multiple component spunbond filaments, the multiple component filaments comprising between about 10 and 90 weight percent of a first lower-melting polymeric component and between about 90 and 10 weight percent of a second higher-melting polymeric component, the first polymeric component comprising at least a portion of the peripheral surface of the filaments, wherein interstitial spaces between the filaments are at least partially filled by the lower-melting component and are substantially free of separately added resin binder, said heavily calendered sheet having an Elmendorf tear measured in both the machine direction and the cross direction of between 0.5 lb and 6.0 lb, a Graves tear measured in both the machine direction and the cross direction of at least 4.0 lb, and a Spencer Puncture of at least 0.70 J, said second spunbond layer is a multicomponent spunbond sheet, said first barrier layer adhered to said second multiple component spunbond sheet, said first barrier layer is selected from the group consisting of polymeric films, metal foils, coated polymeric films, and metalized polymeric films, wherein selected portions of the inner surfaces of the blister and lidding components are adhered together to form a continuous seal and at least one cavity therebetween, the blister component comprising a second barrier layer selected from the group consisting of polymeric films, coated polymeric films, metal foils, and film-foil laminates, and wherein the outer surface of the lidding component comprises the heavily calendered multiple component sheet.
Dependencies are inferred from the claim text.