FI66112C - FOER FARING FRAMSTAELLNING AV CIGARRETTFILTER - Google Patents

Description

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Patent Eoddelat ^ T ^ (51) Kv.Hu/lM.CL3 A 21 »D 3/10 SUOMI — FINLAND <”) »-« »« «- 783283 (22) HtlwwhylW - Ai« atailw «ltt 27.10.78 ( 23) AHwpaM — GHdgktadag 27.10.78 (41) TmMw HklMlnl —MMt offamlg 2k 06 79 i. NkbMltaim «a- ..... '' ftNanfr och regl * eerstyr« lMn 7 Awataw atl ^ d od> «Ufcrtft— pM 31.05-8 ^ (32) (33) (31) * snrd «* r ·« »· * ·» »- h (M prkwfcac 23.12.77

France-France (FR) 7738958 (71) Soci £ t € Job Anciens Etablissements Bardou-Job ε PauMhac, Toulouse, FR; 83 Bid Exelmans, F — 75781 Paris Cedex 16, France-France (FR) (72) Francois Coq, Perpignan, France-France (FR) (7A) Berggren Oy Ab (5k) Method for making cigarette filters - Förfarande för fram-ställning av cigarrettfi1ter

The present invention relates to a method of manufacturing a cigarette filter from a mixture of softenable man-made fibers and natural cellulosic fibers to which a binder is added to provide an interconnection network between the fibers.

It is already known to use fibrous materials as a filter layer, which, when properly treated for the manufacture of cigarette filters, have a certain amount of heat-meltable fibers intended to make cigarette filters, after thermal treatment of said material, mechanically resistant to tobacco burning, but such that a tobacco smoker can breathe well smoke through them.

Other fibrous materials used as a filter layer are also known which can be used to make cigarette filters superimposed in the form of multiple layers, some of which are natural cellulosic fibers such as cellulose wadding, others cellulose acetate, and 66112 is intended to economically produce filters with typical properties. the same as the so-called. in multiple filters, i.e., they are formed of several elements of different qualities arranged in succession.

These two filterable fibrous materials have disadvantages: - firstly: one or more heating devices are required.the equipment with high temperatures must raise the entire mass to be filtered to the melting temperature of the fusible fibers, - secondly: two layers of very different materials must be used, for example one cellulose pile one layer of cellulose acetate, and the use of these requires very highly specialized pretreatments for each layer, and this work is heavy and complex.

The present invention overcomes these disadvantages, since it is a method of making cigarette filters from a single filterable fibrous layer which is a mixture of man-made fibers and natural cellulosic fibers, and this method is characterized in that the mixture is first processed into a web material over which , from which the man-made fibers are made, a suitable plasticizer as a binder, and that the web material is then wound into a cylindrical body before the softening effect ceases to form a

According to one embodiment, the proportion of man-made fibers in the filter consists of cellulose diacetate fibers and the plasticizer used in this case is glycerol triacetate.

The layer of fibrous material can be produced by a classical papermaking method or also by a well-known non-woven textile manufacturing technique. It can be used creped or non-creped. In the first case, the creping can be performed on a paper machine or outside the machine.

66112

The cellulose acetate fibers entering the fiber layer mixture may be short cut, for example 5-25 mmsn of continuous cellulose acetate filaments, curled or not, which usually form a "cable" ("cäble", "la Meche") from which acetate filters are made for cigarettes.

According to a preferred embodiment, the acetate fibers used to form the layer comprise 25% by weight dry, based on the total fiber blend, and the remaining 75% are natural cellulosic fibers.

This fibrous layer is in the form of a coil and its conversion according to the invention into cigarette filters requires the following steps: unwinding from the coil, wetting the layer with water if necessary for the quality of the product to be manufactured, fine longitudinal compression or longitudinal creping, drying, possible application of soft in any known manner used in the manufacture of acetate filters, for example by spraying. In the case of cellulose acetate fibers, the plasticizer used may be glycerol triacetate and may necessarily be less than 20% of the total weight of the filter obtained.

In this way, the plasticizer-impregnated fibrous layer is shaped, geometrically or otherwise, into a cylindrical filter piece, and since softening begins immediately after application of the plasticizer layer and continues after the layer is formed, a connecting network between the fibers is formed. an interconnecting network of fibers between different surfaces, areas or points of a layer formed as a cylindrical body.

The present invention offers the following advantages in the obtained cigarette filters:

Claims (5)

66112 solid structure and good elasticity before and after cigarette smoking thanks to two interconnecting networks of fibers that are rigid and insensitive to tobacco smoke moisture or tobacco smoker's saliva and thus actively contribute to filter structure, good tar and nicotine binding ability in tobacco smoke due to the high content of natural cellulosic fibers, the selective binding capacity of some toxic substances in tobacco smoke, such as phenols, due to a softener selected for this purpose, for example glycerol triacetate, improved organoleptic properties of tobacco smoke after passing through the filter, especially so-called in the case of light "flue cured" tobacco, thanks to the cellulose acetate in the layer. The filter according to the invention thus combines the advantages of a filter for classic paper cigarettes and the advantages of an acetate filter, limiting the disadvantages of both types of filters. A method of making a cigarette filter from a mixture of softenable synthetic fibers and natural cellulosic fibers to which a binder is added to provide an interconnecting network of fibers, characterized in that the mixture is first processed into a web material on which a softener suitable for the material from which the synthetic fibers are made is applied. as a binder, and that the web material is then wound into a cylindrical body before the softening effect ceases, thereby obtaining an interconnecting network of fibers in the synthetic fiber layer of the web and an interconnecting network of fibers between contacting surfaces or zones of the web material formed into a cylindrical body. Process according to Claim 1, characterized in that man-made fibers which are cellulose diacetate fibers are used. 5,66112 Process according to Claim 1, characterized in that the dimensions of the man-made fibers are approximately the same as those of the natural cellulosic fibers. A method according to claim 1, characterized in that the percentage of man-made fibers in the layer is about 20-30% by weight on a dry basis of the fiber mixture, and the rest, 80-70%, is natural cellulosic fibers. Process according to Claim 2, characterized in that the plasticizer is glycerol triacetate.