CN212937897U

CN212937897U - Cigarette with lifting section and auxiliary tool without burning during heating

Info

Publication number: CN212937897U
Application number: CN202020369576.6U
Authority: CN
Inventors: 蒲强; 丁香乾; 杨宁
Original assignee: Qingdao Haida Xinxing Technology Co ltd
Current assignee: Qingdao Haida Xinxing Technology Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-04-13
Anticipated expiration: 2030-03-23
Also published as: WO2021190037A1

Abstract

The utility model relates to a heating non-burning cigarette with a pulling section and an auxiliary tool, a cigarette section and a pulling section connected with the tail end of the cigarette section; a smoking material section in which smoking material can be heated and sucked; an air inlet channel is arranged on the pulling section. The consumer may use the pull section to feed or remove the smoking material section into the heating chamber of the heater. When the inserted tobacco section is heated by the heater heating bin, air enters through the air inlet channel in proportion and is mixed with smoke generated by the tobacco section, and the smoke is discharged and sucked from the suction nozzle at one end of the heating bin. Compared with the existing cigarette which is not burnt by heating, the cigarette heating and non-burning device solves the problems that the cigarette which is not burnt by heating has a complex structure and can not be produced by the existing cigarette shred-making and rolling equipment; low cost, convenient production, reasonable design, compact structure and convenient use.

Description

Cigarette with lifting section and auxiliary tool without burning during heating

Technical Field

The utility model relates to a heating of section is carried in area does not burn cigarette and assists utensil.

Background

Compared with the traditional cigarette, the cigarette product without burning is heated, and by the technical principle of heating and low-temperature baking, the tobacco leaves or tobacco materials can release alkaloid and tobacco fragrance, the harmful ingredients generated by high-temperature combustion and cracking of the tobacco are greatly reduced, and the side stream smoke and the environmental smoke are also greatly reduced. The cigarette which is not burnt by heating is rapidly accepted by consumers in recent years due to the advantages of low harm, no second-hand smoke smell, environmental protection and the like.

The cigarette sold in the market at present is mainly composed of a tobacco section, a cooling section, a filtering section and the like. Most of the materials in the tobacco section are flaky materials and are processed by adopting a reconstituted tobacco process; the whole cigarette is manufactured by adopting special composite processing and manufacturing equipment and a production processing technology; therefore, the cost is high, and the market price is also high. At present, a product which is not combusted by heating is in the initial stage of market promotion, and the brand and the product are few.

The cigarette which is not burnt in the mainstream is provided with a filter tip for being sucked by consumers, although the cigarette is convenient to use, the smoke temperature generated in the cigarette heating process reaches 200-300 ℃, the high-temperature smoke is reduced to normal temperature by means of special cooling design for sucking with the help of the filter tip, and the existing filtering material and production process cannot be adopted, so that the cost is high, the production and processing are complex, and the sensory quality of the smoke is reduced. In addition, the filter tip section mostly adopts special cigarette materials such as cellulose acetate to carry out microparticle interception and filtration, and has the defects of non-degradable environment protection.

The technical problem which needs to be solved urgently is how to fully utilize the existing cigarette production process, shred making equipment, raw materials, cigarette rolling and packaging equipment and the like to carry out the design of heating and non-burning cigarettes, and no new equipment or new process needs to be introduced, thereby protecting the environment and improving the quality.

SUMMERY OF THE UTILITY MODEL

The utility model provides a heating non-combustion cigarette and assistive device with a pulling section. The utility model aims at providing a novel heating incombustible cigarette, this cigarette usable current tobacco industry current throwing technology, the production and processing of package technology completion product, and with low costs, easily production, sensory quality is more close traditional cigarette.

In order to solve the above problems, the utility model adopts the following technical proposal:

a heating non-burning cigarette with a pulling section comprises a cigarette material section and a pulling section connected with the tail end of the cigarette material section; the tobacco section is provided with tobacco;

the lifting section comprises a branch pipe part of which the end part is abutted with the tobacco at the tail end of the tobacco section and/or an air inlet channel is arranged on the lifting section;

when the heating bin is heated by the non-combustion heater and inserted into the tobacco section of the heating bin, air enters through the air inlet channel and is mixed with smoke generated by the tobacco of the tobacco section, and then the air is discharged from the suction nozzle at one end of the heating bin.

As a further improvement of the above technical solution:

a cavity part corresponding to the tail end of the tobacco section is arranged in the branch pipe fitting; the cavity part is provided with a release material;

when the tobacco section inserted into the heating bin is heated by the non-combustion heater heating bin for suction, the volatile components of the released materials enter the heating bin and are mixed with the smoke generated by the tobacco of the tobacco section, and then the mixture is discharged from the suction nozzle at one end of the heating bin.

Also comprises at least one of the following schemes,

a) when the tobacco section inserted into the heating bin is heated by the non-combustion heater heating bin, at least part of the tobacco section is arranged in the heating bin;

b) the outer layer of the tobacco material is wrapped with wrapping paper;

c) the outer wall of the end part of the tobacco section and the outer wall of the lifting section are connected with forming paper;

d) the branch pipe fitting of the lifting section is of a hollow pipe structure, and a plugging piece used as a carrier for releasing materials is arranged in the hollow pipe;

e) the hole designed for the air inlet channel is a damping hole;

f) the release materials comprise spices, essences, seasonings or medicinal materials;

h) the tobacco section is shorter than 30 mm;

j) the branch pipe is made of paper pulp or plant fiber;

k) the outer diameter of the branch pipe is equal to or slightly larger than that of the tobacco section.

The plugging piece is arranged in a sealing way or the air inlet channel is arranged on the plugging piece or an explosion bead is arranged in the plugging piece.

The cavity portion is provided with an air vent as an air intake passage.

As a parallel scheme

a) Along the depth direction of the cavity part, the air holes and the release materials are in the same depth or not;

b) the packing paper comprises cigarette paper with air permeability, composite aluminum foil paper with an aluminum foil layer, packing bobbin paper or oil-proof paper.

The plugging piece comprises plant fiber, plastic, paper pulp, ceramic, activated carbon or a capsule.

An assistive device with a lifting section for heating a non-burning cigarette comprises a non-burning heater, a heating bin and a suction nozzle, wherein the heating bin and the suction nozzle are arranged on the non-burning heater; the heating bin is communicated with the suction nozzle;

when the food is sucked, the tobacco material section is inserted into the heating bin, and air enters through the air inlet channel and is discharged from the suction nozzle after contacting with the tobacco material of the tobacco material section.

As a further improvement of the above technical solution:

the suction nozzle is provided with a metal filter element.

The utility model discloses beneficial effect:

1. the cigarette is designed into a composition structure of the cigarette material section and the lifting section, the cigarette structure of the cigarette material section and the filter tip section of the cigarette is changed, and the cigarette is simple in structure, convenient to use and low in cost.

2. The utility model discloses a cigarette is from the reverse insertion of hot-water heating storehouse lower extreme to combine fixed cigarette holder to come the suction, avoided the heating not to burn the complicated structure that the cigarette need dispose the cooling section, reduced a cigarette material cost and manufacturing cost.

3. The utility model discloses the fibre section of cigarette hollow pipe part can design for outside essence spices, mint etc. provide the source, the essence spices design degree of difficulty of cigarette material section has been simplified, the flexibility of multiple style taste cigarette specification design has been improved, better satisfy consumer diversification, individualized demand, guarantee simultaneously that the source is not heated by high temperature, realize thermal isolation through the cavity, it brings in and will provide the smell that the source produced to realize cooling through the air current flows, and realize slowly releasing under normal atmospheric temperature or low temperature environment, the addition that provides the source has been reduced, and therefore the cost is reduced, the smell runs through whole cigarette along with the air current, make smell and tobacco leaf fully contact and absorbed by it, improve the taste of tobacco leaf, avoid traditional cigarette to take out the edible in-process, only a few preceding mouths have the interpolation taste, and later take out the edible drawback that does not have taste or taste.

4. The cigarette paper and the packaging forming paper used by the cigarette do not need to be made of special tobacco materials such as cigarette paper, tipping paper, acetate fiber and the like, so that the material cost and the production cost of the cigarette are greatly reduced.

5. The materials used by the whole cigarette can be degradable materials, the sensory quality of smoke is not influenced, tobacco materials which are difficult to degrade such as cellulose acetate and the like are abandoned, and the environmental protection performance of the cigarette which is not burnt when being heated is improved.

6. The cigarette material section and cigarette production can adopt the existing production and processing technology, equipment and raw materials of the tobacco industry, the utilization rate of the existing industrial resources is greatly improved, and the cost of switching the traditional cigarette to the heating non-combustible cigarette is greatly reduced.

To sum up, the utility model has the advantages of reasonable design, low cost, compact structure and convenient use.

Drawings

Fig. 1 is an explosion structure diagram of the utility model in use.

Fig. 2 is a schematic structural diagram of the improvement of the present invention.

Fig. 3 is a schematic structural diagram of a variation of the present invention.

Wherein: 1. a tobacco section; 2. a pulling section; 3. wrapping paper; 4. smoking materials; 5. a branch pipe fitting; 6. a heating chamber; 7. a suction nozzle; 8. releasing the material; 9. a blocking member; 10. forming paper; 11. a cavity portion; 12. and (4) air holes.

Detailed Description

As shown in fig. 1-3, the heating non-burning cigarette with a pulling section of the present embodiment includes, as a basic structure, a tobacco section 1 and a pulling section 2 connected to a tail end of the tobacco section 1; there is tobacco 4 in tobacco section 1 to the smoking after supplying the heating, the tobacco is for heating smokeable material, is not limited to the pipe tobacco, can be the mixture of one kind or several kinds of heating smokeable materials such as pipe tobacco, tobacco leaf, granule, all is the utility model discloses protection scope. In actual production, the total length of the cigarette is 28-50 mm, the circumference is 18-26 mm, and the cigarette can be prefabricated or the existing traditional cigarette and the like are adopted. Preferably, the tobacco material segment is composed of tobacco material (including cut tobacco, cut stems, thin sheets, expanded cut tobacco, etc.) and wrapping paper for wrapping the tobacco material. The tobacco section is inserted into the heating cavity of the heating appliance to heat and generate smoke, the tobacco can be formed by mixing one or more of tobacco leaves, cut tobacco, slices, cut stems or granular materials, and heating volatile substances such as feed liquid, medicinal materials or flavors and fragrances can be added in the production process. The tobacco segment length is preferably between 15 and 30mm and the circumference is preferably between 20 and 25 mm. Because the drawing size limits, the utility model discloses an assist the utensil and be the schematic diagram.

An air inlet channel is arranged on the pulling section 2; the air flow is ensured to be smooth, and the supply of the air at normal temperature is ensured. The lifting section is used for inserting the cigarettes into the heating bin from the lower end of the heating bin of the heating appliance or taking the cigarettes out of the heating bin. The lifting section preferably does not enter the heating zone in the heating chamber and does not have a filter for mouth suction. The length of the pulling section is preferably between 20 and 30mm and the circumference is preferably between 20 and 25 mm. The cavity part can penetrate through the hollow pipe and is provided with at least 1 air hole so as to adjust the suction resistance and allow the outside normal temperature gas to enter the cavity and enter the tobacco section.

When the tobacco section 1 inserted into the heating bin 6 is heated by the non-combustion heater heating bin 6 for suction, volatile components (such as essence and the like) of released materials (8) enter through the air inlet channel or the plugging piece and are mixed, dissolved and contacted with smoke generated by the tobacco 4 of the tobacco section 1, and then the released materials are discharged from the suction nozzle 7 at one end of the heating bin 6. This is the fluid path for the air flow of the present invention.

The lifting section 2 comprises a branch pipe part 5 connected with the tobacco section 1, preferably, the end part of the lifting section abuts against the tobacco at the tail end of the tobacco section 1, so that the problem of tobacco leakage is solved, and the branch pipe part 5 realizes convenience of short tobacco section smoking and replacement. A cavity part 11 corresponding to the tail end of the tobacco section 1 is arranged in the branch pipe fitting 5; the cavity part 11 is stored with the release material 8, so that the material can be slowly released and mixed with the smoke generated by heating in a normal temperature or low temperature environment, and the suction quality is improved. When the tobacco section 1 inserted into the heating bin 6 is heated by the non-combustible heater heating bin 6, the released materials 8 enter the heating bin 6 and are mixed with the smoke generated by the tobacco 4 of the tobacco section 1, and then are discharged from the suction nozzle 7 at one end of the heating bin 6.

The utility model discloses still include one of at least following scheme, can be its reasonable combination use:

a) when the tobacco section 1 inserted into the heating bin 6 is heated by the non-combustible heater heating bin 6, at least part of the tobacco section 1 is arranged in the heating bin 6; thereby being convenient for being extracted or inserted by hands and avoiding the branch pipe parts from being heated.

b) And the outer layer of the tobacco material 4 is wrapped with a packing paper 3.

c) The end parts of the tobacco section 1 and the lifting section 2 are connected with forming paper 10; the tobacco section and the lifting section are bonded together by a packaging forming paper roll to play roles in connection forming and sealing; and can print information such as commodity Logo on the surface of the packaging forming paper.

d) The branch pipe piece 5 of the lifting section 2 is of a hollow pipe structure, and a blocking piece 9 for blocking the release material 8 from being exposed or serving as a carrier is arranged in the hollow pipe; thereby reducing the waste of volatile materials released into the air.

e) Holes designed in the air inlet channel are damping holes, and the size and the number of the holes can be adjusted according to actual requirements and market requirements; thereby realize the throttle, reduce the outside release of flue gas and volatile material, improve the comfort of smoking.

f) The delivery material 8 comprises a carrier with a volatile substance.

h) The tobacco section 1 can be shorter than 30 mm; and can be cut or prefabricated as required.

j) The branch pipe 5 is made of paper pulp, plant fiber and the like; the outer diameter of the branch pipe part 5 is equal to or slightly larger than the outer diameter of the tobacco material section. The length of the branch pipe extending into the heating chamber can be adjusted, and the heating quantity of each time can be adjusted. The empty pipe is optimized to branch pipe spare, and the inside packing of empty pipe has the shutoff piece, and the upper end and the tobacco material section of shutoff piece form certain cavity, and the cavity is in the same place with tobacco material section end butt joint, can support and block the tobacco material and scatter. The hollow pipe is made of paper and is made of pulp such as hemp pulp and wood pulp or plant fiber. The thickness of the hollow tube is 0.5-2mm, and the circumference is equal to or slightly larger than that of the tobacco material section.

As shown in fig. 1, the plugging member 9 is hermetically disposed or the air inlet channel is disposed on the plugging member 9 or the plugging member 9 is internally provided with a bead blasting, the bead blasting is extruded to discharge the released material in the explosion, the released material is mixed with the smoke material under the action of air flow and heating, and the material can be plant fiber segments, plastic parts, ceramic particle parts, acetate fibers or propionate fibers and the like. The length of the plugging piece is 5-10 mm, and the diameter is the sum of the inner diameter of the hollow pipe and 0.1-0.3 mm. The blocking piece or the release material can be partially or completely made of fiber materials and can be designed into flavor-containing flavor blasting beads or spray flavor flavors, such as flavors of mint, blueberry, nut and the like, and the cigarette specification design for enhancing flavor, supplementing flavor, adjusting smoke sensory quality and diversified flavors is adopted. Of course, the blocking piece and the releasing material can be integrated or separated, and when the releasing is gas or liquid, the blocking piece is preferably designed integrally and attached to the releasing material.

As shown in fig. 1, the cavity 11 is provided with an air vent 12 as an air intake passage.

As a parallel scheme, but can be reasonably combined and used.

a) Along the depth direction of the cavity part 11, the air holes 12 and the release materials 8 are at the same depth or no longer at the same depth;

b) the wrapping paper 3 used for wrapping the tobacco material in the tobacco material section can be cigarette paper with air permeability, composite aluminum foil paper with an aluminum foil layer, coil paper made of hemp pulp/wood pulp or straw pulp or the like, oil-proof paper with oil-proof property and the like.

As shown in fig. 2, the plugging member 9 comprises plant fiber, plastic, pulp, ceramic, activated carbon, a capsule or the like;

referring to fig. 1, the assistive device with a lifting section for heating non-burning cigarettes of this embodiment includes a non-burning heater, and a heating chamber 6 and a suction nozzle 7 disposed on the non-burning heater; the heating bin 6 is communicated with the suction nozzle 7;

when the food is sucked, the tobacco section 1 is inserted into the heating bin 6, and air enters through the air inlet channel and is discharged from the suction nozzle 7 after contacting with the tobacco 4 of the tobacco section 1. The outer layer of the suction nozzle 7 is made of food-grade silica gel material. As concrete application, the utility model discloses a cigarette inserts the incombustible utensil of heating through the afterbody, adopts the fixed cigarette holder of taking metal filter core cooling performance to carry out the suction, and the tobacco material section is arranged in inserting the heating bunker heating suction from the heating bunker lower extreme, carries the pull-up section to be arranged in inserting or removing the cigarette that does not burn from the heating bunker with the heating.

When the cigarette is heated and sucked, the air flow channel is designed to enter from the lower part of the hollow pipe of the lifting section, penetrate through the plugging piece with air permeability and then enter into the cigarette material section; or air enters from the air holes opened at the cavity part of the hollow pipe of the lifting section and then enters into the tobacco section. On one hand, the airflow channel adjusts the suction resistance during suction and provides normal-temperature air for adjusting high-temperature smoke generated by the heating tobacco section.

As a specific example 1

A non-combustible heating cigarette has a length of 45mm, wherein the length of the cigarette material section is 25mm, and the length of the pulling section is 20 mm; the cigarette circumference is 24 mm. The length of the cigarette forming paper is 27mm, and the cigarette material section and the lifting section are formed into a cigarette in a composite mode.

The tobacco material section adopts traditional cigarette tobacco shreds, and the feeding treatment is carried out, wherein the filling amount of the tobacco shreds is 0.35 g; the cigarette material section packaging paper adopts conventional cigarette coil paper. The lifting section adopts a paper hollow pipe, the length is 20mm, the circumference is 24mm, and the wall thickness is 1 mm; the plugging piece is made of paper pulp fiber materials, the length of the plugging piece is 10mm, the diameter of the plugging piece is 6mm, the hollow pipe is inserted into the lower portion of the hollow pipe section, and the tail end of the plugging piece is flush with the lower end of the hollow pipe. The cavity of hollow tube upper end is 10mm, and the cavity outside pierces through the hollow tube and carries out laser beam drilling, and the row number of punching is around 1 row, and the number is 8, and the aperture is 0.1 mm.

A heating appliance in a peripheral annular tubular heating bin mode is adopted for heating, and a fixed cigarette holder with a metal filter element cooling design is used for sucking.

The cigarette of the embodiment has full and rich smoke, comfortable smoke temperature, outstanding tobacco fragrance, strong physiological satisfaction, moderate suction resistance and convenient use.

As specific example 2:

a heating non-burning cigarette has a length of 35mm, wherein the length of the cigarette material section is 20mm, and the length of the pulling section is 15 mm; the cigarette circumference is 24 mm. The length of the cigarette forming paper is 20mm, and the cigarette material section and the lifting section are formed into a cigarette in a composite mode.

The tobacco material section adopts traditional cigarette tobacco shreds, and is subjected to charging treatment, wherein the filling amount of the tobacco shreds is 0.3 g; the cigarette material section packaging paper adopts composite aluminum foil paper. The lifting section adopts a paper hollow tube, the length is 15mm, the circumference is 24mm, and the wall thickness is 1 mm. The plugging piece is made of wheat straw fiber material, the length is 7mm, and the diameter is 6 mm; spraying mint type essence and spice on the fiber. The fiber material is inserted into the hollow pipe from the lower part of the hollow pipe section, the insertion depth is 12mm, and the distance between the tail end of the plugging piece and the lower end of the hollow pipe is 5 mm. The cavity of the upper end of the hollow pipe is 3mm, and no hole is formed in the outer part of the cavity.

The cigarette has the advantages of large smoke quantity, slow generation of mint fragrance, obvious tobacco baking fragrance, comfortable and cool smoke temperature, moderate strength, comfortable absorption resistance and no peculiar smell.

The present invention has been fully described for a clear disclosure, and is not further described in detail in the prior art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious to those skilled in the art that a plurality of embodiments of the present invention may be combined. Such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. The utility model provides a heating that section was carried in area is not fired and is propped up a cigarette which characterized in that: comprises a tobacco section (1) and a lifting section (2) connected with the tail end of the tobacco section (1); the tobacco section (1) is provided with tobacco (4);

the lifting section (2) comprises a branch pipe part (5) the end part of which is abutted against the tobacco (4) at the tail end of the tobacco section (1) and/or an air inlet channel is arranged on the lifting section (2);

when the tobacco section (1) inserted into the heating bin (6) is heated by the non-combustion heater heating bin (6), air enters through the air inlet channel and is mixed with smoke generated by the tobacco (4) of the tobacco section (1) and then is discharged from the suction nozzle (7) at one end of the heating bin (6).

2. The heating non-burning cigarette with the pulling section according to claim 1, characterized in that a cavity part (11) corresponding to the end of the tobacco section (1) is arranged in the branch pipe part (5); the cavity part (11) is stored with the release material (8);

when the tobacco section (1) inserted into the heating bin (6) is heated by the non-combustion heater heating bin (6) for suction, the volatile components of the released materials (8) enter the heating bin (6) and are mixed with the smoke generated by the tobacco (4) of the tobacco section (1) and then are discharged from a suction nozzle (7) at one end of the heating bin (6).

3. A heated non-combustible cigarette with a pull-up section according to claim 1 or 2 characterised in that the branch pipe (5) of the pull-up section (2) is of hollow pipe construction, in which a closure (9) is arranged as a carrier for the release material (8).

4. A heated non-combustible cigarette with a pull-up section according to claim 3 characterised in that the plug (9) is sealed or the air inlet channel is on the plug (9) or the plug (9) has a bead charge built in.

5. The cigarette with a pulling section of the non-combustible heater according to claim 4, wherein the cavity portion (11) is provided with air holes (12) as air intake passages.

6. A non-combustible heated cigarette with a pull-up section according to claim 5 characterised in that the outer layer of the tobacco material (4) is wrapped with a wrapper (3); the packing paper (3) comprises cigarette paper with air permeability, composite aluminum foil paper with an aluminum foil layer, packing bobbin paper or oil-proof paper.

7. A heated non-combustible cigarette with a pull-up section according to claim 6 characterised in that the ventilation holes (12) are at the same depth or different depths of the release material (8) along the depth of the cavity (11);

the blocking piece (9) comprises plant fiber, plastic, paper pulp, ceramic, activated carbon or a capsule.

8. A heated non-combustible cigarette with a pull-up section according to claim 1 or 2 characterised in that the tobacco section (1) is at least partially housed inside the heating magazine (6) when the tobacco section (1) inserted into the heating magazine (6) is heated by the non-combustible heater heating magazine (6).

9. A heated non-combustible cigarette with a pull-up section according to claim 1 or 2 characterised in that a forming paper (10) is connected between the outer wall of the end of the cigarette section (1) and the outer wall of the pull-up section (2).

10. The cigarette with the pulling section is heated and is not burnt according to the claim 1 or 2, and the holes designed for the air inlet channel are damping holes.

11. A heated non-combustible cigarette with a pull-up section according to claim 1 or 2 characterised in that the release material (8) comprises flavourings, essences, flavourings or herbs.

12. A heated non-combustible tobacco rod with a pull-up section according to claim 1 or 2 characterised in that the length of tobacco material (1) is shorter than 30 mm.

13. A heated non-combustible cigarette with a pull-up section as claimed in claim 1 or 2, characterised in that the tubular member (5) is made of pulp or vegetable fibres.

14. A heated non-combustible tobacco rod with a pull-up section according to claim 1 or 2 characterised in that the outer diameter of the tubular member (5) is the same as or slightly larger than the outer diameter of the tobacco section.

15. An assistive device for heating non-burning tobacco rods with a pulling section according to any one of claims 1 to 14, comprising a non-burning heater, and a heating chamber (6) and a suction nozzle (7) provided on the non-burning heater; the heating bin (6) is communicated with the suction nozzle (7);

when the food is sucked, the tobacco section (1) is inserted into the heating bin (6), and air enters through the air inlet channel and is discharged from the suction nozzle (7) after contacting with the tobacco (4) of the tobacco section (1).

16. An assistive device for heating non-burning cigarettes with a pulling section according to claim 15, wherein the suction nozzle (7) is provided with a metal filter.