DE202020005476U1 - Conical filter for tobacco products - Google Patents

Abstract

Having filters (100) for tobacco products
- a sleeve (110) for receiving a filter material (120),
- two perforated plugs (131, 132) to terminate the sleeve (110), characterized in that the sleeve (110) is conical, so that a first end of the sleeve (111) has a smaller diameter than a second end (112) the sleeve.

Description

The invention relates to a filter for tobacco products, having a sleeve for receiving a filter material, and two perforated stoppers to close the sleeve.

When smoking hand-rolled cigarettes, it is not uncommon to screw prefabricated filters into the cigarette as a mouthpiece. The filter thus serves two purposes, namely on the one hand to filter out unwanted smoke accompanying substances, to cool the smoke and also to protect against burns when the cigarette has burned down close to the mouthpiece. Smokers report that the use of the filter improves the taste of the cigarette and that the overall smoking experience is improved to the effect that the smoking pleasure is increased.

The pre-assembled filter is designed as a consumable. One filter is used for each individual cigarette. The number of hand-rolled cigarettes is very high. The need for the filters described above is correspondingly high. It is known to produce prefabricated filters in home work using stuffing aids. A ceramic sieve is stuffed from one side into a glued paper or cardboard tube, so that a cup is created first. Activated charcoal is then poured into the cup and then the upper opening of the paper or cardboard tube is closed with another filter. Since the ceramic sieve has a rough surface depending on the manufacturing process, it is sufficient that the ceramic sieves are stuffed into the sleeve with a press fit so that the filter has a durability that securely holds a smoking process without disintegrating.

Due to the legal relaxation of the cannabis ban, there is an increased need for filters to equip bag-shaped cigarettes with a mouthpiece. To do this, it is necessary to design the filter itself as a conical shape as a shaping element.

The object of the invention is therefore to provide the conical filter itself.

The object according to the invention is achieved by a filter having the features according to claim 1. Further advantageous configurations are specified in the subclaims of claim 1.

According to the invention it is provided that the sleeve is thus conical, with a first end of the sleeve having a smaller diameter than a second end of the sleeve. The cone is best linear and not curved. The outer surface of the cone thus has the shape of a truncated cone. The projection of the sleeve perpendicular to the axis thus preferably corresponds to a regular parallelogram with straight sides which are themselves part of a straight line and are not curved. In the two openings of the cone with different diameters there are perforated stoppers through which the smoke flows. Both stoppers have different diameters. The difference between the two diameters is just enough that the cone angle is between 0.5 ° and 2 °. At the lower limit, namely at 0.5 °, the shape for cigarettes of the usual size can just be determined. At the upper limit, namely at 2 °, the shape of the sleeve is already so strong that the cigarette has a very strong bag-like character. A cone angle of around 1 ° has proven to be best. Cigarettes with this conicity can still be packaged and are characterized by the even burning of the tobacco / the filling.

The size of the sleeve has a significant impact on the size of the cigarette that is rotated with the filter. If the sleeve is too large, the amount of smoke in one puff is too large, so that the smoke is no longer perceived as tasty. If the sleeve is too small, the smoking pleasure per puff is subjectively unsatisfactory. Filters with a plug diameter in the range from 4 mm to 8.5 mm have proven to be best. The length of the filter is advantageously between 2 and 3 cm. The cone angle of the sleeve is advantageously between approx. 0.5 ° and 2 °, exactly tan ^-1 (Δd / I), with Δd = diameter difference and I = length of the sleeve.

For a particularly neutral taste, sleeves that are wrapped from paper and have ceramic stoppers have proven to be advantageous for producing the filter. Ceramic sleeves have the advantage that they do not release any solvents or combustion / pyrolysis gases when the embers of the cigarette get close to the filter. The ceramic filter is both heat-resistant and heat-insulating. The thermal insulation means that the glow of the cigarette is not transferred to the paper tube, so that when the cigarette stub is smoked, no paper smell arises. In an embodiment of the invention, the ceramic sleeves used can consist of an open-pored ceramic, such as a fire made from Australian soapstone. The porosity of the ceramic leads to hygroscopy. The open-pored ceramic absorbs condensate from the smoke, which on the one hand prevents condensate droplets from entering the mouth and on the other hand, filtering the condensate gives the smoke a better taste than without filtering or without condensate separation.

Instead of winding the paper tube, it is also possible in an embodiment of the invention to use the Form sleeve from pulp. Finally, it is also possible, in an embodiment of the invention, to manufacture the sleeve from a cylindrical and wound paper sleeve which is expanded to a cone by stretching over a mandrel or by pressing into a mold. This sleeve then has a wall thickness that becomes narrower as the diameter increases.

In order to achieve the lowest possible draw resistance, the filter can be filled with activated carbon granulate. The smoke is drawn through the granulate with relatively little pressure loss. The pollutants to be filtered out are deposited on the activated carbon and are adsorbed by the activated carbon. To avoid very small pieces of activated charcoal being inhaled with the smoke, provision can be made for cellulose or cellulose acetate to be additionally stuffed into the sleeve on the side facing the mouth, which prevents activated charcoal granules from finding their way into the mouth.

• 1 einen erfindungsgemäßen Filter in einer Explosionsansicht mit noch nicht gereckter Hülse,
• 2 die Explosionsansicht aus 1 in einer perspektivischen Ansicht,
• 3 einen erfindungsgemäßen Filter in einer durchbrochenen Ansicht,
• 4 eine gedrehte Zigarette, welche den konischen Filter als formgebendes Element aufweist.

The invention is explained in more detail with reference to the following figures. It shows:

• 1 a filter according to the invention in an exploded view with the sleeve not yet stretched,
• 2 the exploded view 1 in a perspective view,
• 3 a filter according to the invention in a broken view,
• 4th a twisted cigarette, which has the conical filter as a shaping element.

In 1 is a filter according to the invention 100 shown in an exploded view with a conical sleeve 10. The filter shown here 100 has activated carbon granules inside 140 as filter material 120 on. The in 1 the bottom stopper 131 is perforated. It has bores or tunnel-shaped recesses 131 ' through which the smoke flows when smoking. The in 3 The plug 131 at the top is constructed identically to the plug 131 at the bottom, but has a slightly larger diameter than the inside diameter of the sleeve 110 corresponds to. The diameter d _{1 of} the lower plug 131 and the diameter d _{2 of} the upper plug are shown in FIG 1 shown as measuring tapes. The difference in diameter d ₁ and diameter d _{2 can be seen} from the measurements. In order to place the plugs 131 and 132 more easily in the sleeve ends, it is provided that the plugs 131 and 132 have a conical taper.

In 2 is the filter according to the invention 100 shown in an exploded view with a conical sleeve 10; but here in a perspective view.

The filter shown here 100 shows as well as in 1 activated carbon granulate inside 140 as filter material 120 on. The in 2 the bottom stopper 131 is perforated. It has bores or tunnel-shaped recesses 131 ' through which the smoke flows when smoking. The in 4th The plug 131 at the top is constructed identically to the plug 131 at the bottom, but has a slightly larger diameter than the inner diameter of the sleeve 110 corresponds to. In order to place the plugs 131 and 132 more easily in the sleeve ends, it is provided that the plugs have a conical taper.

In 3 is the filter according to the invention 100 Shown in composite form, the sleeve diameter being the diameter at the top of the sleeve 110 corresponds to the diameter d _{2 of} the upper stopper and at the lower end corresponds to the diameter d _{1 of} the lower stopper. The mantle angle α of the filter 100 is in 3 drawn.

In 4th is a cigarette after all 200 with the filter according to the invention 100 shown as a shaping element. The filter 100 When used as intended, lies at the end of the cigarette's mouth 200 in front. The mouth end of the filter is due to the small cone angle between 0.5 ° and 2 ° 100 not always easily recognizable. For this purpose it is advantageous if the filter 100 at least one printed arrow P. shows.

List of reference symbols

100

filter

110

Sleeve

111

end

112

end

120

Filter material

121

Plug

131 '

Recess

132

Plug

132 '

Recess

140

Activated carbon granulate

160

shape

200

Cigarette

α

Jacket angle

P.

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Claims (7)

A filter (100) for tobacco products, comprising - a sleeve (110) for receiving a filter material (120), - two perforated plugs (131, 132) to terminate the sleeve (110), characterized in that the sleeve (110) is conical so that a first end of the sleeve (111) has a smaller diameter than a second end (112) of the sleeve. Filter by Claim 1 , characterized in that the two stoppers (131, 132) have a different diameter, the stoppers (131) preferably having a diameter between 4 mm and 8.5 mm. Filter for one of the Claims 1 or 2 , characterized in that the cone angle of the sleeve (110) is between 0.5 ° and 2 °. Filter for one of the Claims 1 to 3 , characterized in that the sleeve (110) is wound from paper and that the plugs (131, 132) are made of ceramic. Filter for one of the Claims 1 to 3 , characterized in that the sleeve (110) is formed from pulp. Filter for one of the Claims 1 to 3 , characterized in that the sleeve (110) consists of a cylindrical and wound paper sleeve which is widened to a cone by stretching over a mandrel or by pressing into a mold. Filter for one of the Claims 1 to 4th , characterized in that the sleeve (110) is filled with activated carbon granulate (140), and optionally on the side with the smaller diameter of the sleeves (110) is additionally stuffed with cellulose and / or cellulose acetate.

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