Glatfelter Gernsbach Gmbh & Co. Kg

Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg

Papcel - Papier Und Cellulose, Technologie, Und Handels-gmbh

Unicon Papier Und Kanststoffhandel Sgesellschaft Mbh

Günter Heinrich

Manfred Kaussen

Martin Büchsel

Yves Le Brech

Danny Meger

Manfred Kauβen

Stefan Kuntz

Roland Kochel

Processes for producing a filter material which contains heatsealable, biodegradable and compostable polymeric fibers and is characterized in that it additionally contains a lubricant in an amount from 0.5 to 5.0% by weight, based on the paper weight of the ready-produced filter material.

Process for producing heatsealable filter materials

A filter material comprising at least one nonheatsealable ply and at least one heatsealable ply which comprises fibers of synthetic material and contains an adhesion promoter, and also processes for producing same.

Heatsealable filter material

Described are a filter material which contains heatsealable, biodegradable and compostable polymeric fibers and is characterized in that it additionally contains a lubricant in an amount from 0.5 to 5.0% by weight, based on the paper weight of the ready-produced filter material, and also processes for producing same.

Heatsealable filter materials

The invention concerns a filter material particularly useful in the manufacture of tea bags, coffee bags, coffee filters and the like. The filter material includes an at least two layer non-woven substrate material wherein the two layers are essentially planar and superimposed, one layer is composed of natural fibers and one layer is composed of synthetic fibers. The synthetic fiber layer includes a plurality of individual plastic fibers which are deposited in a heated state on the natural fiber layer. The plastic fibers fuse with each other and also fuse with the natural fibers of the other layer. The filter material provides the particular advantage, due to the deposition of the individual plastic fibers on the natural fibers, of covering or closing a large number of pores or ducts in the natural fiber layer. The filter material of the invention has a low particle discharge since only minimal cross-pores are present in the filter material based on the tangled and closed filter material formed by the arrangement and fusing of synthetic fibers on the natural fiber layer.

Filter material

The tea bag paper comprises a first phase of natural fibers in a weight percentage of from 60% to 85%, and a second phase of heat-sealable synthetic fibers with the remainder of the weight percentage of from 15% to 40%. The second phase penetrates the first phase in such a way that both sides of the paper are adapted to be heat-sealed, with the unit area weight of the paper being between 10 and 15 g/m.sup.2. The tea bag paper exhibits enhanced tea diffusion, and may be processed on special high-speed automatic tea packing machines, because it is heat-sealable on either side thereof.

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Gernsbach, Germany

Günter Heinrich