Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/02—Manufacture of tobacco smoke filters
  • A24D3/0275—Manufacture of tobacco smoke filters for filters with special features
  • A24D3/0287—Manufacture of tobacco smoke filters for filters with special features for composite filters

Definitions

• the present invention relates to methods for production of composite rods for the tobacco industry (such as cigarette filters or cigarette-substitute smoking articles) of the type comprising the steps of:
• the filter segments can be made of different materials (such as cellulose acetate and/or cellulose acetate impregnated with carbon particulate) and further they may be either of the "wrapped" type, i.e. each provided with its own paper wrapping, which is then covered by said wrapping web, or they may be of the "non-wrapped” type in which case the wrapping web enters into direct contact with the surface of the material constituting the filter segments.
• the filter segments can be made of different materials (such as cellulose acetate and/or cellulose acetate impregnated with carbon particulate) and further they may be either of the "wrapped" type, i.e. each provided with its own paper wrapping, which is then covered by said wrapping web, or they may be of the "non-wrapped” type in which case the wrapping web enters into direct contact with the surface of the material constituting the filter segments.
• the apparatus comprises a paper web wrapping station, arranged downstream of the area at which the filter segments are received on the web. At this station the paper web is guided so as to be laterally wrapped around the filter segments while adhering thereto. Usually at this station a further application of adhesive material is provided between the overlapped edges of the paper web wrapped around the filter segments.
• the solutions known in this field include the deposition of adhesive material on the inner face of the wrapping web, by spreading or spraying.
• the adhesive material is typically PVA and/or a hot-melt adhesive.
• the paper web on which the adhesive material is preliminarily applied is able to adhere efficiently to wrapped filter segments due to that a contact paper-to-paper is obtained.
• the adhesion is less efficient for segments of the non-wrapped type, wherein the web paper is in direct contact with the material constituting the filter segments (such as cellulose acetate). In this case the grip coefficient is dramatically reduced.
• the object of the invention is that of solving the above indicated drawbacks.
• the object of the invention is that of improving the efficiency of the adhesion of the wrapping web over the segments constituting a composite rod for smoking articles, whatever is the structure and the composition of the rod (such as a cigarette composite filter or a cigarette-substitute smoking article) and in particular whatever is the type of segments (such as wrapped or non-wrapped filter segments) of which it is made.
• the invention provides a method for producing composite rods for smoking articles, comprising the steps of:
• the adhesion of the wrapping web over the segments is obtained after that adhesive material has been applied directly over the segments.
• the adhesive material is applied only on the segments and not also on the wrapping web, the application on the wrapping web being what is made in the prior art.
• the adhesive material is applied directly on the segments and also on an inner face of the web which is to enter into contact with said segments.
• the adhesive material is applied on the segment surface and on the inner face of said web, at positions such as to obtain adhesion of the web on the segments by contact of the adhesive material applied on the segments with the adhesive material applied on the web (glue-to-glue contact).
• the adhesive material deposited directly on the filter segments covers at least partially the surface irregularities so as to give rise to a uniform surface, which insures a good adhesion. This is the reason why the invention is able to solve the problem also in the case in which the adhesive material is applied only on the filter segments.
• the invention provides the further advantage that by covering the surface irregularities of the non- wrapped segments, which is obtained by applying adhesive material directly on the filter segments, the above described scraping action causing a removal of the adhesive material from the wrapping web is avoided.
• the adhesion is improved since a glue-to-glue contact is accomplished rather than a glue-to-cellulose acetate contact.
• the wrapping web may also be of the type which is already provided with a layer of glue.
• the adhesive material which is applied on the filter segments is preliminarily added with dyes and/or flavours.
• the invention also provides the apparatus able to carry out the above described method, according to what is indicated in claim 8.
• FIG. 1 is a perspective view of a detail of an apparatus for production of cigarette filters according to the prior art
• FIG. 1 A, 1 B are cross-sectional views of a filter segment, during and after wrapping of the paper web, according to the solution of figure 1 ,
• figure 2 shows the device of figure 1 modified according to a first embodiment of the present invention
• FIG. 2A, 2B are views in cross-section of a filter segment, during and after wrapping of the paper web, according to the solution of figure 2,
• figure 3 shows the device of figure 1 modified according to a second embodiment of the present invention
• FIG. 3A, 3B are views in cross-section of a filter segment, during and after wrapping of the paper web, according to the solution of figure 3.
• reference numeral 1 generally designates a portion of an apparatus for production of cigarette filters in which a plurality of filter segments A (of the wrapped type) and B (of the non-wrapped type) are fed in sequence in a longitudinal direction X and deposited on a paper web W which also is caused to advance continuously along the same direction X.
• the paper web W is fed in a vertical direction along a first run 2, after which it is re-directed in a horizontal run 3 by engagement on a cylindrical support 3a.
• the horizontal run 3 of the paper web W receives thereon the aligned filter segments A, B which are caused to advance in the longitudinal direction X of the horizontal run 3 of the paper web W.
• an adhesive material applicator device 4 adapted to form on web W, as a result of the movement of the web, one or more longitudinal stripes G (in this specific case two stripes G are shown - see also figure 1A) arranged longitudinally at the centre of web W.
• the adhesive material G is used for causing the paper web W to adhere on the filter segments A, B, which are deposited thereon.
• a wrapping station WS Downstream of the area at which the web W receives the filter segments A, B there is provided a wrapping station WS, with guiding means of any known type (not shown) which cause bending and wrapping of W laterally around the filter segments A, B. Web W is thus wrapped around segments A, B and held thereon by the adhesion effect due to the adhesive material G (which usually is PVA or a
• Wrapping is completed by application of a further quantity of adhesive material F (see figure 1A) between the overlapped edges of the bent and wrapped web W, with the aid of a further adhesive material applicator 5, which is arranged at the wrapping station WS.
• Figure 2 shows a preferred embodiment of the present invention, in which the system still includes the applicator device 4 for depositing strips G of adhesive material on web W, but in addition thereto it also includes one or more adhesive applicator devices 6 (in the illustrated example two applicator devices 6 are provided) adapted to deposit adhesive material directly on each filter segment A and/or B.
• the applicator device 5 at the wrapping station WS is also present.
• the adhesive material is applied directly on the filter segments so as to cover at least partially the irregularities of the surface of the non-wrapped filter segments, which already involves an improvement in the final adhesion effect.
• the applicator devices 6 are at a fixed position and deposit longitudinal strips of adhesive G' on the surface of filter segments A, B as a result of a movement of segments along direction X.
• the strips G' of adhesive material deposited on the filter segments and the strips G of adhesive material deposited on web W are positioned in such a way as to come in contact with each other when the web W is wrapped around the segments. In this manner, a glue- to-glue contact is obtained which ensures a further safe and efficient adhesion also with filter segments of the non-wrapped type.
• the adhesive material can be any adhesive material of the prior art, such as PVA or hot-melt adhesive.
• the paper web W may be of the type which is already provided with a layer of adhesive, in which case the adhesive material applicator device 4 or 5 is not necessary.
• Figure 3 shows a simplified embodiment, which is still advantageous, in which the adhesive material is applied only on filter segments A, B while no adhesive is deposited on the web W, so that the applicator device 4 is eliminated.
• this embodiment is identical to that of figure 2.
• the adhesive applicator device 5 is present, for depositing a layer of adhesive which enables a direct bond between the overlapped edges of the web W wrapped over the filter segments.
• the adhesive applicator devices 6, similarly to applicator devices 4, 5, can be made in any known way.
• the detailed of construction of the applicator devices are not shown herein since, as indicated, they can be made in any known way and also because the elimination of these details from the drawings render the latter simpler and easier to understand.
• the configuration, the number and the arrangement of these applicator devices can be varied and is determined by the experts depending upon specific characteristics of the filter segments and the web for wrapping the filter segments.
• the adhesive material before that the adhesive material is applied on said segments, it is preliminary added with dyes and/or flavours.
• the invention is applicable to any type of composite rod for a smoking article including a plurality of rod segments enclosed within a wrapping web, with any number, structure, material and shape of the rod segments.

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• Cigarettes, Filters, And Manufacturing Of Filters (AREA)
• Manufacturing Of Cigar And Cigarette Tobacco (AREA)

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Applications Claiming Priority (2)

Publications (1)

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Citations (6)

• 2015
  • 2015-05-22 EP EP15732397.3A patent/EP3148353B1/de not_active Not-in-force
  • 2015-05-22 WO PCT/IB2015/053787 patent/WO2015181694A1/en active Application Filing

Patent Citations (6)

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