Porous web material
AssigneeJ. R. Compton Limited
InventorsIvan Gbur, Brian Tomkinson, Joyce Alston
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Abstract
A fibrous, porous web material of the heat seal type having improved particulate retention properties for use in the manufacture of beverage infusion bags. The material comprises juxtaposed, successively wet laid first (1), second (5) and third (7) fibrous layers, at least one of said layers incorporating heat sealable fibres. The fibres in the first layer are of greater aspect ratio than those in the second layer which are of higher aspect ratio than those in the third layer.
Claims20
A fibrous, porous, heat sealable web material having improved particulate retention properties for use in the manufacture of beverage infusion bags, the material comprising juxtaposed, successively wet laid first, second and third fibrous layers, at least one of said layers incorporating heat sealable fibres wherein the fibres in the first layer are of greater aspect ratio than those in the second layer which are of higher aspect ratio than those in the third layer.
A method of producing a fibrous, porous, heat sealable web material of improved particulate retention properties for use in the manufacture of beverage infusion bags, the method comprising successively laying first, second and third fibrous layers whilst effecting drainage from formation of the first layer to formation of the third layer structure, at least one of said layers incorporating heat sealable fibres, wherein the fibres in the first layer are of greater aspect ratio than those in the second layer which are of higher aspect ratio than those in the third layer.
Dependencies are inferred from the claim text.