SK104198A3 - Cigarette filter - Google Patents

Abstract

The invention concerns a filter material which is suitable in particular for producing cigarette filters. The material is characterized in that molten softened cellulose acetate is applied by the melt blown technique to a strip of prefabricated filter paper.

Description

Technical field

The present invention relates to a cigarette filter and to a process for its manufacture.

BACKGROUND OF THE INVENTION

For conceptual reasons, a cellulose filter is increasingly applied to the cigarette filter. Especially in the construction of light and ultra-light cigarettes, paper is popular because of the very good retention properties. However, the disadvantage of the commonly used cellulose acetate filter is that the paper filter changes taste. Therefore, the paper filter is not suitable as a monofilter, but only as a so-called filter. a double, dual or multiple filter in conjunction with other filter material. However, the production of multiple filters is extremely complicated and costly.

US-A-3,900,037 discloses a filter material in which a layer of cellulose acetate is applied to a carrier layer of a tissue web. The filter material so produced is processed into filter rods and cut to the usual lengths of the cigarette filter. The filter material then appears to have a more or less homogeneous, dense cellulose acetate layer on the carrier layer of the undirected web, similar to the color layer.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter material and a method for producing a filter material for a cigarette filter that combines the advantages of cellulose acetate and paper.

SUMMARY OF THE INVENTION

According to the invention, cellulose acetate is thus applied to the paper web by a meltblown process (Melt-Blown). This combines the good retention properties of cellulose with the selective retention properties of cellulose acetate. Surprisingly, when this monofilament is made of this material, it exhibits the same retention and taste properties as conventional multiple filters with the same overall retention. Making this filter material of a new kind can be used in the melt blowing process using smooth or creped paper strips;

which, in a plurality of layers, in particular in one layer, lie in the weight range of 8 to 50 g / m 2, in particular 15 to 30 g / m ² , such that the blown molten cellulose acetate has an acetylation degree of 1 to 3, in particular 1, 7 to 2.6. This cellulose acetate is, in particular by means of triacetin, a plasticized cellulose acetate, wherein the triacetin softens the cellulose acetate fiber walls so that they interlock at the points of intersection and contact.

Depending on the ratios of the amount of paper to cellulose acetate, it may be advantageous to use a binder. The binder may be a hot melt adhesive or e.g. modified extrudable and meltable starch. This is particularly recommended from an ecological point of view. In any case, care must be taken that the processing temperature of the binder does not affect the quality of the additionally applied cellulose fibers.

Claims (19)

PATENT CLAIMS Filter material for the manufacture of cigarette filters, wherein molten, softened cellulose acetate is deposited on the web of pre-treated filter paper by the melt blowing process. Filter material according to claim 1, characterized in that the cellulose acetate is deposited using an additional binder. Filter material according to claim 1, characterized in that the filter paper consists of one or more layers. Filter material according to one of Claims 1 to 3, characterized in that the filter paper has a basis weight of 8 to 50 g / m ² . Filter material according to any one of claims 1 to 4, characterized in that the basis weight per filter paper web is between 15 and 30 g / m ² . Filter material according to any one of claims 1 to 5, characterized in that the filter paper is smooth. Filter material according to any one of claims 1 to 5, characterized in that the filter paper is creped. I Filter material according to any one of claims 1 to 7, characterized in that the filter paper comprises materials with a large surface area such as activated carbon, sea foam, and the like. Filter material according to any one of claims 1 to 8, characterized in that the filter paper comprises materials with a large surface area, which are bonded with flavor or taste additives. Filter material according to claim 9, characterized in that the additives are vitamins. Filter material according to claim 1, characterized in that the deposited cellulose acetate has an acetylation degree of from 1.2 to 2.8. Filter material according to claim 1, characterized in that the degree of acetylation is in the range 1.5 to 2.5. Filter material according to any one of claims 1 to 12, characterized in that the cellulose acetate is free of titanium dioxide. Filter material according to any one of claims 1 to 13, characterized in that the cellulose acetate is admixed with triacetin or other plasticizers. Filter material according to claim 14, characterized in that the cellulose acetate has up to 20% plasticizer. Filter material according to one of claims 1 to 15, characterized in that cellulose acetate having a fiber thickness of 0.1 to 2 denier is applied to the filter paper. 17. A method of making a filter material for a cigarette filter, wherein molten, softened cellulose acetate is melt blown onto a pre-treated paper web suitable for the cigarette filter. The method of claim 17, wherein the application of cellulose acetate to the paper is performed using a binder. The method of claim 18, wherein the cellulose acetate is applied to the paper at a fiber thickness of 0.1 to 2 denier.