Process for producing a liquid impermeable and flushable web
AssigneeThe Procter & Gable Company
InventorsNichholas A. Ahr, Raymond J. Dirk
Life of this patent
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Abstract
A process for impregnating a resin into a substrate to form a web. The resin is impregnated into one side of the web, so that the other side remains exposed. This arrangement allows the exposed side of the web to be dispersible in water, while the impregnated side is water resistant. The impregnation may occur in zones and comprise one material or two or more materials. The resulting web is useful as a backsheet in disposable absorbent articles wherein it is desired to have a barrier that is impermeable to body fluids, yet flushable for disposal.
Claims20
A process for producing a liquid impermeable and flushable web, said process comprising the steps of:
- providing a water dispersible substrate having a first side and a second side, said sides being mutually opposed;
- providing a first resinous material;
- heating said first resinous material so that said first resinous material is flowable;
- providing a first printing roll having a first longitudinal axis, said first printing roll being rotatable about said first longitudinal axis;
- providing a first anvil, said first anvil being juxtaposed with said first printing roll to form a first nip therebetween;
- transporting said substrate relative to said first printing roll and said first anvil at a transport velocity;
- depositing said first resinous material to said first printing roll;
- rotating said first printing roll about said first longitudinal axis at a first peripheral velocity, said first peripheral velocity is at least about 100% greater than said transport velocity, thereby creating a first velocity differential, and applying said first resinous material from said first printing roll to said first side of said substrate, said first resinous material having sheer forces imparted thereto by said velocity differential to impregnate said substrate with said first resinous material, whereby said first resinous material is impregnated into said substrate;
- and
- wherein a web is formed from said substrate, said web having a first side, impregnated with said first resinous material.
A process for producing a liquid impermeable and flushable web, said process comprising the steps of:
- providing a substrate having a first side and a second side, said sides being mutually opposed;
- providing a first resinous material which is flowable;
- providing a first printing roll having a first longitudinal axis, said first printing roll being rotatable about said first longitudinal axis, said first printing roll having printing zones and non-printing zones;
- providing a first anvil, said first anvil being juxtaposed with said first printing roll to form a first nip therebetween;
- transporting said substrate relative to said first printing roll and said first anvil at a transport velocity;
- depositing said first flowable resinous material to said printing zones of said first printing roll;
- rotating said first printing roll about said first longitudinal axis at a first peripheral velocity, said first peripheral velocity being different than said transport velocity, thereby creating a first velocity differential, and applying said first resinous material from said printing zones of said first printing roll to said first side of said substrate, said first resinous material having sheer forces imparted thereto by said velocity differential to impregnate said substrate with said first resinous material, whereby said first resinous material is impregnated into said substrate;
- and
- wherein a web is formed from said substrate, said web having a first side impregnated with said first resinous material, at positions registered with said printing zones of said first printing roll.
Dependencies are inferred from the claim text.