CN116998754A - Hollow cooling rod with double venturi structures - Google Patents

Abstract

A hollow cooling rod with a double-venturi structure consists of an inner venturi channel, an outer venturi channel and tipping paper coated outside the outer venturi channel; the inner venturi channel is formed by forming a plurality of inner venturi cavities along the axial direction inside the filter stick body after being pressed; the outer venturi channels are channels of a plurality of outer venturi cavity structures which are formed by the outer wall of the filter stick body and coated molding paper or tipping paper along the axial direction after the filter stick body is pressed. After the cigarettes are butted, the smoke can pass through the inner and outer channels and is used for heating the cigarettes, so that the cigarettes have a good cooling effect and a large smoke quantity.

Description

Hollow cooling rod with double venturi structures

Technical Field

The application belongs to the technical field of novel tobaccos, and particularly relates to a hollow cooling rod with a double-venturi structure.

Background

The cigarette smoke is in an aerosol state, aerosol particles are tiny liquid drops, and the smoke temperature has direct influence on the particle size and the components of the aerosol, so that the quantity of harmful components of the smoke and the sensory quality of the cigarette are influenced. When the smoke temperature is too high, the burning sensation and the irritation are obviously increased, and particularly, the burning sensation and the irritation are more obvious in the aspect of heating cigarettes, and the reduction of the smoke temperature is the continuously improved technical direction of the products.

For heated cigarettes, the amount of smoke drawn is directly related to the resistance of the filter rod and the efficiency of the filter. When the suction resistance is large and the filtering efficiency is high, the smoke aerosol is adsorbed by the filter stick, the smoke amount is small, and the experience and satisfaction of a user are poor; conversely, when the suction resistance is smaller and the filtering efficiency is lower, the smoke quantity is large, and the experience and satisfaction of the smoker are good. The reduction of the suction resistance is also a continuously improved technical direction for heating non-combustible cigarette products. For traditional cigarettes, the problems of high pungency, poor sensory experience and the like can be caused by high smoke temperature, and the quality of the cigarettes can be improved by properly reducing the smoke temperature.

CN112930121a discloses an aerosol-generating system comprising a venturi element, which can reduce the cooling section after using the venturi element, illustrating that the venturi structure has a certain cooling effect. The venturi element in the literature belongs to a standard venturi structure, is provided with an air introducing channel, is relatively complex, is relatively high in manufacturing difficulty and high in cost, is suitable for being matched with a smoking set (heater) for repeated use, and is not suitable for heating cigarettes for one-time use.

In the previous stage (CN 111387543A, CN111387546A, CN 111436650A), when cigarette smoke passes through a hollow rod similar to a venturi tube or a corrugated tube, the diameter of the inner cavity part is changed from shrinkage to amplification, and the smoke is in a strong turbulence state, so that the adsorption of smoke aerosol on the tube wall is reduced, the smoke quantity is ensured, the heat transfer coefficient is 2-4 times that of a common hollow tube, and the heat transfer and cooling effect is enhanced; on the other hand, the flue gas aerosol also undergoes the processes of turbulent collision, collision condensation during expansion, divergent atomization during contraction and reduction, the specific surface area during secondary atomization is increased, and the heat in the air is absorbed, so that the temperature of the flue gas is further reduced.

The problems that the filter stick is heated and contracted, a smoke channel is blocked, and the smoke quantity of the second half section is obviously reduced in the smoking process of part of heating cigarettes in the market at present can occur. If the inner venturi channel and the outer venturi channel are adopted, the problem of shrinkage and blockage of the filter stick can not occur, even if the filter stick close to the smoke section is shrunk, the diameter is reduced, the inner venturi channel is reduced or is completely blocked, at the moment, the outer cavity, namely the outer venturi channel, is enlarged, the smoke can still pass through, and obvious smoke volume reduction can not occur.

In order to solve the problems, further strengthen the cooling effect of the flue gas, develop the differentiated product which can be produced industrially and continuously, meet the requirements of disposable heating cigarettes, adapt to the needs of different consumers, and research the filter stick with the inner and outer double venturi structures.

Disclosure of Invention

The application aims to solve the technical problem of providing a hollow cooling rod with a double-venturi structure. The rod changes the flue gas flowing through the channel, and the cooling effect is obvious. The diameters of the inner cavity part and the outer cavity part are changed from shrinkage to amplification, so that the smoke is in a strong turbulence state, the adsorption of smoke aerosol on the pipe wall is reduced, the smoke amount is ensured, the heat transfer coefficient is 2-4 times that of a common hollow pipe, and the heat transfer and cooling effects are good; on the other hand, the flue gas aerosol also undergoes the processes of turbulent collision, collision agglomeration during expansion, divergent atomization during contraction and reduction, the specific surface area during secondary atomization is increased, and the heat in the air is absorbed, so that the temperature of the flue gas is further reduced, and the burning sensation and the irritation during suction are obviously reduced. Because this filter rod is direct structure for when heating the cigarette, when the cooling, also can ensure the atomizing volume of cigarette, satisfy the experience sense of smoker. After the internal and external double-channel design is adopted, the problem that the channel blockage and the obvious reduction of the smoke quantity of the second half section can occur in the smoking process of partial heating cigarettes in the current market is also solved.

The technical scheme of the application is as follows: a hollow cooling rod with a double-venturi structure consists of an inner venturi channel, an outer venturi channel and tipping paper coated outside the outer venturi channel;

the inner venturi channel is formed by forming a plurality of inner venturi cavities along the axial direction inside the filter stick body after being pressed;

the outer venturi channels are channels of a plurality of outer venturi cavity structures which are formed by the outer wall of the filter stick body and coated molding paper or tipping paper along the axial direction after the filter stick body is pressed.

After the cigarettes are butted, the smoke can pass through the inner and outer channels and is used for heating the cigarettes, so that the cigarettes have a good cooling effect and a large smoke quantity.

The filter stick body part has certain elasticity and strength, the hardness is more than or equal to 84 percent, and the minimum wall thickness position b is more than or equal to 0.5mm.

The inner venturi passage is formed by connecting a plurality of inner venturi cavities with a plurality of inner venturi throat cylindrical pipes in a staggered manner along the axial direction;

the cross section of the inner Venturi cavity is of a special-shaped structure, and the cross section of the inner Venturi cavity is any one of a polygon, a circle, a star, a heart, a quincuncial shape, a leaf shape or an arc shape, and is preferably a circle.

The maximum nominal diameter d2 of the inner Venturi cavity is 2mm-6mm, and the cavity length L2 is 5mm-60mm;

the nominal diameter d1 of the cavity of the inner venturi throat cylindrical pipe is less than or equal to 2mm, and the length L1 is 0.5mm-10mm;

the length of the inner Venturi cavity is 1-50 times of the length of the cylindrical pipe of the inner Venturi throat.

d1 size change obviously affects the suction resistance and smoke quantity of the filter stick, and has a certain influence on the cooling effect. When the tow wiredrawing forming process is adopted, the solid part 21 of the Venturi rod also has certain air permeability, and when d1=0mm, the gap in the solid part plays a role of a throat channel, and the suction resistance is raised to a certain extent, but the design requirement of part of cigarettes can be met; when the injection molding process is adopted, the air permeability of the filter stick body part is very low, smoke mainly passes through the double venturi channels, when d1 is less than or equal to 0.3mm, the suction resistance of the filter stick is more than 12Pa/mm, the smoke quantity is reduced, and meanwhile, the proportion of the smoke passing through the outer venturi channels is increased, so that the phenomenon of mouth burning can occur, and the filter stick is not suitable for heating cigarettes; as d1 increases, the suction resistance decreases and the smoke amount increases; when d1 is more than or equal to 2mm, the suction resistance of the filter stick is less than 1Pa/mm, and the filter stick can be used for heating cigarettes after being compounded with other filter sticks. d2 has certain influence on the heat collapse, the smoke quantity and the comprehensive quality of cigarettes, and when d2 is less than 2mm, the phenomena of heat collapse and peculiar smell exist, and the cooling effect is poor; d2 When the diameter is more than or equal to 2.0mm, the thermal collapse is improved, the smoke quantity is slightly increased along with the increase of d2, the cooling effect is further improved, and when the diameter of d2 is more than or equal to 3.5mm, the smoke quantity and the cooling effect tend to be stable; meanwhile, the diameter of the cigarette is generally smaller than 7.7mm, and the maximum value of d2 is set to be less than or equal to 6mm in consideration of the requirements of a certain wall thickness and hardness of the Venturi rod.

When the total length of l1+l2 is kept unchanged, the length of l1 is increased, the suction resistance is increased, the smoke amount is reduced, and the l1 is generally less than or equal to 5.0mm.

The cross section shapes of the inner venturi cavity of the inner venturi channel and the inner venturi throat cylindrical pipe are selected to be the same or different; the inner Venturi cavity consists of a special-shaped curved tube with gradually increased nominal diameter, equal diameter and gradually reduced nominal diameter; the gradual increase and decrease along the axial direction are equal-distance gradual increase and gradual decrease; the inner Venturi cavity with gradually increased and gradually reduced nominal diameter is arc-shaped, conical or platform along the axial direction; the radian and angle of the gradual increase and decrease of the arc-shaped pipe and the conical pipe at the two ends of the same cavity unit are preferably the same and symmetrical.

The outer venturi channel consists of an outer wall of a body part with an axial groove and a shape similar to a corrugated pipe along the axial direction and formed paper coated outside, and the cross section of the filter stick body is in a circular arc shape with the groove.

The depth of the grooves of the outer Venturi channel is 0.05mm-1.0mm, the number of the grooves is 1-30, and 1-12 are preferably uniformly distributed along the circumferential direction; the difference between the maximum diameter and the minimum diameter of the outer venturi cavity is 0.1-2mm, preferably 0.1-1mm.

When the deviation between the maximum diameter and the minimum diameter of the outer Venturi cavity is too large, certain difficulty is brought to cigarette tipping, and d4-d3 is usually less than or equal to 1mm for conveniently tipping cigarettes; the depth and the number of the grooves determine the size of the neck channel of the outer Venturi, when the size is too large, the smoke passing through the external channel is increased, the smoke quantity is increased, but the temperature of the external forming paper and the tipping paper is increased, and when the temperature is severe, the mouth is scalded, so that the depth of the grooves is controlled within 1.0mm, and is usually less than or equal to 0.3mm; the outer venturi channel has relatively smaller cavity, plays the roles of assisting in cooling and increasing smoke amount in heating cigarettes, and compared with a single inner venturi channel, the throat groove section and the cavity section have the same cooling and smoke amount increasing principle as the corresponding sections of the inner venturi, and can assist in reducing the smoke temperature by 1-3 ℃ and increasing the smoke amount by 5-20%.

In the limit state, when the number of grooves on the outer wall of the body part is 0, the circumference of a cigarette or a filter stick is enlarged by 0.05-0.1mm when the cigarette or the filter stick is butted with the forming paper, so that a small amount of gaps exist between the body part of the filter stick and the forming paper, thereby forming an outer Venturi throat channel, and the effect of forming 4-6 grooves on the outer wall can be achieved.

The outer venturi channel is free of grooves, so that a small amount of gaps exist between the filter stick body and the forming paper by improving the roundness of the filter stick body to 0.35-0.60mm, and then the outer venturi throat channel is formed, so that a double venturi structure is formed.

The inner wall and the outer wall of the inner venturi channel and the outer venturi channel are smooth structures;

the main body material is an injection molding piece of any one of PP, PE, PET, PLA, PC, PS, PA, PCL, PHA, PHB, PBS, PGS, PEA, PPS, ABS, PVC, PBAT, PEEK, PMMA high polymer materials, or is formed by adopting acetate fibers, or a mixture of acetate fiber tows and one or more of PLA fibers, PP fibers, viscose fibers, polyester fibers and the like and a curing agent.

The preparation method comprises two steps of injection molding and wire drawing filter stick molding:

the injection molding is to customize a corresponding mold according to the designed structure of the double venturi filter stick, and then use the mold for injection molding;

the wire drawing filter stick forming is that a fiber tow material of curing agent glyceryl triacetate or tributyl citrate is applied after opening on a wire drawing filter stick forming machine, a wire drawing shaping smoke gun with a corresponding mould is introduced, and a hollow stick after high-temperature solidification and cooling shaping is pulled out and cut to prepare the wire drawing filter stick;

the fiber tows are prepared by adopting acetate fiber tows or mixed tows of acetate fibers and polylactic acid fiber tows, applying triacetin or tributyl citrate, introducing into a special smoke gun provided with a corresponding mold, and pulling out and cutting after steam high-temperature curing and cold air shaping.

The application has reasonable design, unique structure, novel appearance, convenient production and obvious flue gas cooling effect. The continuous industrial production can be realized, the number of the sections of cigarettes can be reduced, and the cost of the cigarettes can be reduced; can be compounded with common vinegar stick for traditional cigarette, and can reduce smoke temperature, reduce irritation and improve sensory quality; the filter stick is of a straight-through structure, has lower suction resistance, can ensure the atomization amount of cigarettes while reducing the temperature, and meets the experience of a smoker; the internal and external double-channel design also solves the problems that partial heating cigarettes in the current market can be blocked in the channel and the smoke quantity in the second half section is obviously reduced in the smoking process, and provides a new solution for improving the quality of cigarettes and developing novel tobacco products.

Drawings

The application is further described below with reference to the drawings and examples.

FIG. 1 is a schematic illustration of a fluid flow pattern in a bellows of the present application.

FIG. 2 is a cross-sectional view of the injection molded dual venturi tube of embodiment 1 of the present application, wherein the body of the dual venturi filter rod of 21', the cavity of 22', the cylindrical tube of the venturi throat of 221', the tube of the curve of gradually increasing venturi diameter of 222' and the tube of gradually decreasing venturi diameter of 223' are shown; 23 'outer venturi cavity, 231' outer venturi throat channel, 232 'outer venturi diameter gradually increasing curve tube, 233' outer venturi diameter gradually decreasing curve tube.

FIG. 3 is a sectional view showing a double venturi acetate fiber rod according to embodiment 2 of the present application, wherein the double venturi acetate fiber rod body 21, the venturi cavity 22, the venturi throat cylindrical tube 221, the venturi diameter gradually increasing curve tube 222, and the venturi diameter gradually decreasing curve tube 223; 23 outer venturi cavity, 231 outer venturi throat channel, 232 outer venturi diameter gradually increasing curvilinear tube, 233 outer venturi diameter gradually decreasing curvilinear tube.

Fig. 4 is a schematic cross-sectional view of a three-section cigarette of an embodiment of the present application, wherein 1 is a cigarette section, 2 is a double venturi filter rod section, 3 is an acetate fiber filter section, 4 is an inner venturi channel, 5 is an outer venturi channel, and 6 is a molded paper.

Fig. 5 is a cross-sectional structural view of another embodiment of the present application, d1', d2' being the minimum and maximum diameters of the inner venturi cavity portion, respectively, d3', d4' being the minimum and maximum outer diameters of the outer venturi cavity portion, respectively, and 21 being the body of the filter rod.

FIG. 6 is a cross-sectional block diagram of another embodiment of the present application, a venturi throat channel outside 231.

Fig. 7 is a cross-sectional structural view of another embodiment of the present application.

Fig. 8 is a cross-sectional view of a two-section cigarette of another embodiment of the application, 1 'being a cigarette section and 2' being a dual venturi filter rod section.

Fig. 9 is a cross-sectional view of a two-section cigarette of another embodiment of the application, 1 "being a cigarette section and 2" being a dual venturi filter rod section.

Fig. 10 is a cross-sectional view of a two-section cigarette of another embodiment of the application, 1 '"being a cigarette section and 2'" being a dual venturi filter rod section.

Fig. 11 is a cross-sectional view of a two-stage heating cigarette of another embodiment of the present application, with 1"" being the cigarette section and 2"" being the dual venturi filter rod section.

Fig. 12 is a schematic cross-sectional view of a three-section conventional cigarette according to another embodiment of the present application, wherein 1' "is a cigarette section, 2'" is a dual venturi filter rod section, and 3' "is an acetate filter section.

Detailed Description

Preparing a three-section cigarette sample: firstly taking out the filtering section by tweezers, then taking out the empty pipe section and the cooling section or the cooling section and the filtering section of the fiit, marlboro cigarette bullet by tweezers manually, taking care of not damaging the tipping paper wrapped on the outer layer, replacing the empty pipe section and the cooling section of the fiit, marlboro cigarette bullet by the Venturi tube in each embodiment, and placing the original filtering section in the original position or replacing the cooling section and the filtering section, thus preparing three-section cigarette samples, wherein 10 cigarettes are respectively used for each sample.

Preparing a two-stage cigarette sample: firstly, taking out the hollow tube section, the cooling section and the filtering section of the fiit, marlboro cigarette bullet manually by using tweezers, taking care of not damaging the tipping paper wrapped by the outer layer, and then replacing the hollow tube section, the cooling section and the filtering section of the fiit, marlboro cigarette bullet by using the Venturi tube in each embodiment, so that two-section cigarette samples can be prepared, wherein 10 cigarettes are respectively obtained for each sample.

The suction method comprises the following steps: the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10.

The preparation method of the double-venturi injection tube is shown in example 1, and the preparation method of the double-venturi wiredrawing filter rod is shown in example 2.

Preparing a two-section type and three-section type cigarette: cutting the cigarette rod, the double venturi rod and the three-section filter rod into designed lengths, sequentially and alternately feeding the cigarette rod, the double venturi rod and the three-section filter rod into a binary and ternary compound machine, a labeling machine or a cigarette machine, wrapping the outer surface of the cigarette rod by using forming paper or tipping paper, bonding the cigarette rod by using lap adhesive, and cutting the cigarette rod.

The following describes the embodiments of the present application further with reference to the drawings.

FIG. 1 shows a fluid flow model in a corrugated pipe, wherein the fluid is reduced in speed and increased in static pressure at wave crests along the flow direction, and the fluid is increased in speed and reduced in static pressure at wave troughs, so that the flow speed and the pressure are always in a regular disturbance state, strong disturbance can be generated when the fluid flows, the flow state reaches sufficient turbulence, and the fluid in the pipe cannot form laminar flow. The fluid is carried out under the condition of repeatedly changing the speed and the pressure gradient, and the generated vortex washes the boundary layer, so that the formation of the boundary layer is greatly destroyed. The periodic cross-section change increases the turbulence intensity near the pipe wall and the turbulence heat supply capacity, so that the fluid achieves turbulent heat exchange, thereby improving the heat transfer rate; the heat transfer and cooling effect is enhanced for flue gas aerosol. On the other hand, the flue gas aerosol also undergoes the processes of turbulent collision, collision condensation during expansion, divergent atomization during contraction and reduction, the specific surface area during secondary atomization is increased, and the heat in the air is absorbed, so that the temperature of the flue gas is further reduced.

Example 1

FIG. 2 is a cross-sectional view of a dual venturi injection molding tube according to an embodiment of the present application, wherein d1', d2' are the minimum diameter and the maximum diameter of the inner venturi cavity portion, respectively, d3', d4' are the minimum diameter and the maximum outer diameter of the outer venturi cavity portion, respectively, the gray shade is the body of the filter rod, and the inner cavity portion forms an inner venturi channel; the outside is in the shape of a corrugated pipe with an axial groove, and after the cigarettes are assembled, the corrugated pipe and tipping paper (tipping paper) form another outer Venturi channel.

D1 '=1.2 mm, d2' =4.5 mm, d3 '=6.0 mm, d4' =7.0 mm; the length l1 '=1.67 mm of the cylindrical tube part of the venturi throat of the inner cavity, the length l2' =15.0 mm of the cylindrical tube part of the venturi throat of the inner cavity, the number of grooves of the outer wall is 4, and the depth of the grooves is 0.5mm; the design model of the filter stick is divided into two parts from the axle center, then a corresponding mould is manufactured according to the shape of the divided filter stick (half), injection molding is carried out on injection molding grade PLA resin in Zhejiang sea at 190 ℃, and 2 semi-finished products formed by injection molding are bonded and combined to prepare the 100mm multiplied by 22mm PLA Venturi stick with 6 cavities.

With this venturi stick, cut into 4 equal parts, every part's length is 25mm, corresponds to 1.5 venturi units, is one end macropore, the other end aperture respectively. The cooling section and the filtering section (the length is 25 mm) of the fiit cigarette bullet are manually replaced, namely a lip end large hole and a lip end small hole, so that 10 three-section cigarette samples are prepared respectively; the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10. From the detection data, the smoke concentration index of the control group is 34.1%, the smoke concentration index (SDI) is doubled after the control group is changed into a Venturi tube, the smoke temperature of a big hole at the lip end is 65.2%, the smoke temperature is close to that of raw smoke, the smoke temperature of a small hole at the lip end is about 45 ℃, and the smoke temperature of a small hole at the lip end is raised to a certain degree, and the smoke temperature is about 52 ℃. Can meet the requirements of heating cigarettes in general.

Example 2

Fig. 3 is a schematic cross-sectional view of a dual venturi acetate rod according to an embodiment of the present application, the gray shaded portion 21 being the body of the filter rod, wherein d1, d2 are the minimum and maximum diameters of the inner venturi cavity portion, respectively, d3, d4 are the minimum and maximum outer diameters of the outer venturi cavity portion, respectively, and B, B are the minimum and maximum wall thicknesses of the body portion of the filter rod, respectively. The inner blank 22 is a filter rod cavity of the inner venturi passage and consists of a venturi throat cylindrical tube 221, a curved tube 222 of progressively increasing diameter, and a curved tube 223 of progressively decreasing diameter. The outer blank section 23 is a plug cavity of the outer venturi passage, and is constituted by an outer venturi throat channel 231, a curved tube 232 of gradually increasing diameter, a curved tube 233 of gradually decreasing diameter, together with an outer wrap of plug wrap.

The flue gas aerosol has better heat transfer and cooling effects when passing through the inner venturi channel and the outer venturi channel; meanwhile, the diameters of the inner cavity part and the outer cavity part are changed from contraction to amplification continuously, so that the flue gas aerosol also undergoes turbulent collision, collision condensation during expansion, divergent atomization during contraction and reduction, the specific surface area during secondary atomization is increased, heat in the air is absorbed, and the flue gas temperature is further reduced. Because the Venturi channel of the filter stick is of a straight-through structure, lower suction resistance is also brought; the suction resistance of the filter stick and the smoke quantity of cigarettes can be further adjusted by adjusting the size of the Venturi throat channel d1 and the number and depth of grooves on the outer wall; when the device is used for heating cigarettes, the required atomization amount of cigarettes can be ensured while the temperature is reduced, so that the individual experience of different smokers is met.

In fig. 3, in the limit state, when d1=d2=0, the internal cavity is of solid structure, the filter rod becomes a single outer venturi filter rod; when d3=d4, the number of grooves on the outer wall is 0, the outer wall becomes smooth cylindrical and the filter rod becomes a single inner venturi filter rod; when d1=d2 > 0, d3=d4, the number of grooves on the outer wall is 0, it becomes a common hollow filter rod. In FIG. 3, to ensure strength and performance of the dual venturi filter rod, the minimum wall thickness b of the filter rod body portion is ≡0.5mm.

2 acetate fiber tows of 6.0Y36000D are respectively led into respective opening systems for opening through two sets of yarn guiding devices on a wiredrawing filter rod forming machine with an upper opening system and a lower opening system, the pressure of opening rollers is 0.25MPa, and the roller speed ratio of the two opening rollers is 1:1.3-1.4; spraying 15% of glyceryl triacetate on the opened tows; mixing the two tows of the upper layer and the lower layer together by a yarn guiding device to form mixed tows; and then introducing the tows into a special die, introducing steam of 0.1-0.3 MPa for rapid solidification, introducing cold air of 10 ℃ and 0.1MPa for shaping, then feeding into a smoke gun, further wrapping the preliminarily solidified tows with cloth belts, drawing and forming, and then preparing the double venturi cooling rod with the structure shown in figure 3 through cutting and packaging procedures.

By selecting different moulds and cutting lengths, a series of double venturi filter sticks with diameters of 6.7mm-7.5mm, lengths of 100mm, 120mm and 132mm and 2-12 holes can be prepared respectively.

Setting d1=0.8 mm, d2=4.0 mm, d3=6.5 mm, d4=7.0 mm, the number of grooves on the outer wall is 6, the depth of the grooves is 0.2mm, l1=2 mm, l2=14.5 mm, and a corresponding mould is selected to prepare a 132mm×22.0mm×700Pa dual venturi filter rod with 8 holes, and the dual venturi filter rod is cut into 4 sections to prepare the heated nonflammable cigarette shown in fig. 9, wherein a cylindrical small hole is in butt joint with a cigarette, a lip end is also a small hole, and the heated nonflammable cigarette comprises 2 complete internal cavities.

The venturi rod is used for manually replacing a hollow pipe section, a cooling section and a filtering section of the Marlboro cartridge, a lip end is a small hole, 10 two-section cigarette samples are made, and 2 venturi units are contained in the sample cigarettes; the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10. From the detection data, the smoke concentration index of the control group is 35.2%, the smoke concentration index (SDI) is increased by 60% and is 56.3% after the control group is changed into the Venturi tube, but the later smoke concentration index (SDI) is reduced to be close to that of the raw smoke, and the smoke temperature is increased by about 10 ℃ and is 57.2 ℃. The cigarette has slight burning sensation and peculiar smell, after the cigarette is completely drawn, the filter tip is peeled off, and the small hole part of the contact part of the front end and the smoke generating section has thermal collapse and small hole.

Example 3

In example 2, the filter rod with the cutting position changed can be used for preparing a heating cigarette which is shown in fig. 8, is in butt joint with cigarettes at the large hole part of the inner cavity, is large at the lip end and has a structure of 2 double venturi units. The venturi rod is used for manually replacing a hollow pipe section, a cooling section and a filtering section of the Marlboro cartridge, the cigarette end and the lip end are large holes, 10 two-section cigarette samples are made, and the sample cigarettes contain 2 venturi units; the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10. From the detection data, the smoke concentration index of the control group is 35.2%, the smoke concentration index (SDI) is increased by 70% and 59.8% after the smoke quantity of the second half section is reduced and the double venturi filter rod with the structure is changed, the smoke quantity of the front section and the rear section is kept unchanged, the whole smoke quantity is increased, the uniformity is improved, the smoke temperature is close to that of the original smoke and is about 45 ℃, no burning feeling and peculiar smell are generated, the filter tip is peeled off after the cigarette is exhausted, and the large hole part of the front end, which is contacted with the smoke generating section, is not thermally collapsed, so that the comprehensive quality of the heated cigarette is improved.

Example 4

In example 3, 2 rows of holes were punched in the range of 2-5mm at the outlet of the smoking set with a row spacing of 2mm and 6 holes per row with a hole diameter of 0.2mm. The detection result shows that the smoke concentration index (SDI) is increased by 20 percent, and is 71.6 percent, the smoke quantity of the front section and the rear section is kept unchanged, the overall smoke quantity is larger, the smoke temperature is reduced by about 5 ℃, the burning sensation, the irritation and the peculiar smell are avoided, and the comprehensive experience is better.

In the embodiments 3-4, the cigarette and filter stick structure shown in fig. 8 is adopted, the size of d1 is adjusted to obviously influence the suction resistance and smoke amount of the filter stick, the cooling effect is also influenced to a certain extent, when d1=0mm, the gap in the solid part plays the role of a throat channel, the cooling effect is better, but the suction resistance of the filter stick is more than 10Pa/mm, the smoke is filtered more, and the smoke amount is reduced; as d1 increases, the suction resistance decreases and the smoke amount increases; when d1 is more than 2mm, the suction resistance of the filter stick is less than 1Pa/mm, and the filter stick can be used for cigarettes after being compounded with other filter sticks. d2 has certain influence on the heat collapse, the smoke quantity and the comprehensive quality of cigarettes, and when d2 is less than 2mm, the phenomena of heat collapse and peculiar smell exist, and the cooling effect is poor; d2 When the diameter is more than or equal to 2.0mm, the thermal collapse is improved, the smoke quantity is slightly increased along with the increase of d2, the cooling effect is further improved, and when the diameter of d2 is more than or equal to 3.5mm, the smoke quantity and the cooling effect tend to be stable. When the total length of l1+l2 is kept unchanged, the length of l1 is increased, the suction resistance is increased, the smoke amount is reduced, and the l1 is generally less than or equal to 5.0mm.

In order to facilitate the cigarette to be assembled, the depth of the groove is generally less than or equal to 1mm, the depth of the groove is generally less than or equal to 0.3mm, the cavity of the outer venturi channel is relatively smaller, the effects of assisting in cooling and increasing the smoke amount in heating the cigarette are achieved, compared with a single inner venturi channel, the principle of cooling and increasing the smoke amount of the throat groove section and the cavity section is the same as that of the corresponding section of the inner venturi channel, and the smoke temperature can be assisted in reducing the smoke temperature by 1-3 ℃ and increasing the smoke amount by 5-20%.

In the embodiment, d4 is kept unchanged, the number of grooves on the outer wall of the body part is set to be 0, and when the cigarettes are butted or the molding paper is wrapped, the circumference of the cigarettes or the filter sticks is enlarged by 0.05-0.1mm, so that a small amount of gaps exist between the filter stick body part and the molding paper, and further an outer venturi throat channel is formed, and the effect of forming 4-6 grooves on the outer wall can be achieved.

Example 5

In example 2, d1=1.2 mm, d2=4.5 mm, d3=6.5 mm and d4=7.0 mm are kept, the number of grooves on the outer wall is 6, the depth of the grooves is 0.2mm, L1=3 mm and L2=30 mm are adjusted, a corresponding die is selected to prepare a 132mm×22.0mm×400Pa Venturi filter rod containing 4 holes, the Venturi filter rod is cut into 4 sections and then is butted with cigarettes, a heating cigarette shown in fig. 10 can be prepared, the large hole part of an inner cavity is butted with cigarettes, the lip end is also large hole, the heating cigarette consists of 1 double Venturi units (2 'half cavities'), the Venturi rod is used for manually replacing a 'hollow tube section+a cooling section+a filtering section', the cigarette end and the lip end of a Marlboro cartridge are large holes, 10 two-section cigarette samples are prepared, and the sample cigarettes contain 2 Venturi units; the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10. From the detection data, the smoke concentration index (SDI) of the dual venturi filter rod changed into the structure is increased by 95 percent and is 68.3 percent, the smoke quantity of the front section and the rear section is kept unchanged, the overall smoke quantity is increased and is uniform, no peculiar smell is generated, after the cigarettes are exhausted, the filter rod is peeled off, the macroporous part of the front end, which is contacted with the smoke section, is not thermally collapsed, compared with the structure of 2 dual venturi units in the embodiment 3, the smoke quantity is increased by about 15 percent, the smoke temperature is increased by about 48.6 ℃ and the differentiated experience of partial consumers can be met.

Example 6

In example 2, d1=0.8 m, d2=3.0 mm, d3=4.92 mm, d4=5.19 mm, l1=1.5 mm, l2=15 mm were set, the opening machine of the upper and lower double layers was replaced with a single-layer opening machine with 50% widening of the opening rolls, 1 acetate tow of 5.0Y45000D was used, the opening roll pressure was 0.25MPa, and the roll speed ratio of the two opening rolls was 1:1.25 to 1.35; spraying glycerol triacetate with 13% of the mass of the silk bundle onto the opened silk bundle; and then introducing the tows into a special die, introducing 0.1-0.3 MPa of steam for quick solidification, introducing 15 ℃ and 0.1MPa of cold air for shaping, then feeding into a smoke gun, further wrapping the preliminarily solidified tows by using a cloth belt, drawing and forming, and then cutting and packaging to prepare the 132mm multiplied by 16.5mm multiplied by 800Pa dual venturi filter stick with 8 cavity units, wherein the dual venturi filter stick can be assembled into a heating cigarette with the structure of 2 dual venturi units shown in fig. 8, the heating cigarette is detected according to the suction method of national standard electronic cigarettes, the single-port suction duration is 3.0 s, the suction capacity is 55.0 mL, the frequency is one port per 30.0 s, the smoking set is a matched customized fine cigarette smoking set, the heating time is 5min, and the number of suction ports is 10. The detection result shows that the smoke concentration index (SDI) is 45.8%, the smoke temperature is 46.1 ℃, the burning feeling, the irritation and the peculiar smell are avoided, and the comprehensive quality is good.

Fig. 5 is a schematic cross-sectional view of an embodiment of the application, wherein d1', d2' are the minimum and maximum diameters of the inner venturi cavity portion, respectively, d3', d4' are the minimum and maximum outer diameters of the outer venturi cavity portion, respectively, and the grey shading 21 is the body of the filter rod, wherein the inner and outer light grey portions represent part of the body and cavity transition forming.

Fig. 6 is a schematic cross-sectional structure of embodiments 2-6 of the present application, wherein the grey shaded portion is the body of the filter rod, the inner and outer light grey portions represent part of the body and the cavity formed during transition, the cross section of the inner cavity is circular, the slit 231 on the outer circle is the groove on the outer part of the filter rod, and the outer venturi throat channel is formed by the outer slit and the outer molded paper or tipping paper.

FIG. 7 is a schematic cross-sectional view of another embodiment of the present application, wherein the cross-section of the internal cavity is changed into a five-pointed star shape by changing the preparation mold on the basis of FIG. 6, and the shape of the internal five-pointed star-shaped cavity can be seen after the cigarettes are butted, so that the novel and unique appearance is achieved. And the shape of the inner cavity part can be changed into heart shape, plum blossom shape, leaf shape, square shape, diamond shape, triangle shape, ellipse shape and the like by analogy.

Fig. 11 is a cross-sectional view of a cigarette of another embodiment of the present application, including three cavity units, wherein 1"" is a cigarette segment and 2"" is a dual venturi filter rod segment. In the foregoing embodiment, the dual venturi filter rod with three cavity units may be prepared by adjusting the total length of "l1+l2", and then may be docked with a cigarette.

Example 7

Fig. 4 is a schematic cross-sectional view of a three-section heating cigarette of another embodiment of the present application, wherein 1 is a cigarette section, 2 is a dual venturi filter rod section, 3 is a acetate fiber filter section, 4 is an inner venturi channel, 5 is an outer venturi channel, and 6 is formed paper. Firstly, compounding the Venturi rod 2 with the acetate fiber rod 3, and then butting cigarettes; or on a ternary compound machine, the three parts of the material bars are cut and then are compounded at one time. Can meet the requirements of heating cigarettes on smoke temperature, atomization amount and the like.

In example 5, the filter rod with the length of 4 double venturi units of 25mm can be prepared by adjusting d1=1.0 mm, L1=2 mm and L2=23 mm and keeping other parameters unchanged and selecting corresponding dies. The venturi rod is used for manually replacing an empty tube section and a cooling section of the fiit cigarette bullet, the butt-joint smoke generating section and the filtering section are large holes, 10 three-section cigarette samples are prepared respectively, and 1 double venturi unit is contained in the sample cigarette; the detection is carried out according to the suction method of the national standard electronic cigarette, the suction duration of a single port is 3.0 s, the suction capacity is 55.0 mL, the frequency is that one port is sucked every 30.0 s, the smoking set is a MYUZ smoking set, the heating time is 5min, and the number of suction ports is 10. From the detection data, the smoke concentration index of the control group is 34.1%, the smoke concentration index (SDI) after the control group is changed into the venturi tube is 44.2%, the stability of the front section and the rear section is improved, the smoke temperature is 47.6 ℃, the comprehensive experience is good, and the requirements of heating cigarettes can be met.

Example 8

Fig. 12 is a schematic cross-sectional view of a three-section conventional cigarette according to another embodiment of the present application, in which 1' "is a cigarette section, 2'" is a dual venturi filter rod section, and 3' "is an acetate filter section.

In example 2, d1=1.2 mm, d4=7.48 mm, l2=13 mm were adjusted, other parameters were kept unchanged, and a corresponding die was selected to prepare a venturi rod 2' "having a length of 120mm×23.5mm×300Pa and containing 8 double venturi units of 15mm length; the acetate fiber rod 3' "can be prepared in a conventional filter rod mode; the venturi rod 2 '"is compounded with the acetate fiber rod 3'" and then the cigarettes are butted to prepare the cigarettes shown in fig. 12, so that the smoke temperature can be reduced, the irritation can be reduced, and the sensory quality can be improved.

Selecting a conventional cigarette with a cigarette circumference of 24.0mm, a cigarette section 1' "length of 54mm, a filter rod part length of 30mm and a suction resistance of 700 Pa; after the double venturi filter sticks 2 '"with the length of 15mm and the acetate filter sticks 3'" with the length of 15mm are combined, the suction resistance is set to be 700Pa, the composite stick is connected into cigarettes instead of the original single acetate filter stick, and compared with the original cigarettes, the smoke analysis result is similar, the smoke temperature is reduced to 42.6 ℃, the irritation is reduced, and the comprehensive quality of the cigarettes is improved.

The application has reasonable design, unique structure and obvious flue gas cooling effect, and can reduce the number of sections of cigarettes and reduce the cost of cigarettes. Because venturi passageway is the straight-through structure in the middle of this filter rod, through the size of adjusting inside cavity passageway, can further adjust smog volume size for novel tobacco is when the cooling, also can prepare the cigarette of different atomizing volume, satisfies the experience sense of different individual smokers.

The above embodiments are merely preferred embodiments of the present application, and should not be construed as limiting the present application, and the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without collision. The protection scope of the present application is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this application are also within the scope of the application.

Claims (10)

1. The hollow cooling rod with the double-venturi structure is characterized by comprising an inner venturi channel (4), an outer venturi channel (5) and tipping paper (6) coated outside the outer venturi channel;

the inner venturi channel (4) is formed by forming a plurality of inner venturi cavities (22) which axially occur in the filter stick body (21) after being pressed;

the outer Venturi passages (5) are passages of a plurality of outer Venturi cavity (23) structures which are formed by the outer wall of the filter rod body (21) and coated molding paper or tipping paper (6) along the axial direction after the filter rod body (21) is pressed.

2. The hollow cooling rod with double venturi structure according to claim 1, wherein the filter rod body (21) has certain elasticity and strength, the hardness is more than or equal to 84%, and the minimum wall thickness b is more than or equal to 0.5mm.

3. The hollow cooling rod with double venturi structure according to claim 1, wherein the inner venturi channel (4) is formed by connecting a plurality of inner venturi cavities (22) and a plurality of inner venturi throat cylindrical pipes (221) in a staggered manner along the axial direction;

the cross section of the inner Venturi cavity (22) is of a special-shaped structure, and the cross section of the inner Venturi cavity comprises any one of a polygon, a circle, a star, a heart, a quincuncial shape, a leaf shape or an arc shape, and preferably a circle.

4. A double venturi structured hollow cooling bar according to claim 3, wherein the maximum nominal diameter d2 of the inner venturi cavity (22) is 2mm-6mm, the cavity length L2 is 5mm-60mm;

the nominal diameter d1 of the cavity of the inner venturi throat cylindrical pipe (221) is less than or equal to 2mm, and the length L1 is 0.5mm-10mm;

the length of the inner Venturi cavity (22) is 1-50 times that of the inner Venturi throat cylindrical pipe (221).

5. A double venturi structured hollow cooling bar according to claim 3, characterized in that the cross-sectional shape of the inner venturi cavity (22) of the inner venturi passage (4) is optionally the same or different from the cross-sectional shape of the inner venturi throat cylindrical tube (221); the inner venturi cavity (22) consists of a profiled curved tube with gradually increasing nominal diameter and with equal diameter and gradually decreasing nominal diameter; the gradual increase and decrease along the axial direction are equal-distance gradual increase and gradual decrease; the inner venturi cavity (22) with gradually increasing and gradually decreasing nominal diameter is arc-shaped or conical along the axial direction; the radian and angle of the gradual increase and decrease of the arc-shaped pipe and the conical pipe at the two ends of the same cavity unit are preferably the same and symmetrical.

6. A hollow cooling rod with double venturi structure according to claim 1, characterized in that the outer venturi channel (5) consists of a body part outer wall with axial grooves, bellows-like shape along the axial direction and an outer coated molded paper (6), the cross section of the filter rod body (21) of which is arc-shaped with grooves.

7. A double venturi structured hollow cooling bar according to claim 6, characterized in that the depth of the grooves of the outer venturi channel (5) is 0.05mm-1.0mm, the number of grooves is 1-30, preferably 1-12, evenly distributed along the circumferential direction; the difference between the maximum diameter and the minimum diameter of the outer venturi cavity is 0.1-2mm.

8. The hollow cooling rod with double venturi structure according to claim 6, wherein the outer venturi channel (5) has no groove, so that a small amount of gaps exist between the filter rod body part and the forming paper by improving the roundness of the filter rod body (21) to 0.35-0.60mm, thereby forming the throat channel of the outer venturi, and forming the double venturi structure.

9. The hollow cooling rod with double venturi structures according to claim 1 or 2, wherein the inner wall and the outer wall of the inner venturi channel (4) and the outer venturi channel (5) are both smooth structures;

the main body material is an injection molding piece of any one of PP, PE, PET, PLA, PC, PS, PA, PCL, PHA, PHB, PBS, PGS, PEA, PPS, ABS, PVC, PBAT, PEEK, PMMA high polymer materials, or is made of acetate fibers, or a mixture of the acetate fibers and one or more of PLA fibers, PP fibers, viscose fibers, polyester fibers and the like, and a curing agent.

10. The dual venturi structured hollow cooling bar of claim 1, wherein: the preparation method comprises two steps of injection molding and wire drawing filter stick molding:

the injection molding is to customize a corresponding mold according to the designed structure of the double venturi filter stick, and then use the mold for injection molding;

the wire drawing filter stick forming is that a fiber tow material of curing agent glyceryl triacetate or tributyl citrate is applied after opening on a wire drawing filter stick forming machine, a wire drawing shaping smoke gun with a corresponding mould is introduced, and a hollow stick after high-temperature solidification and cooling shaping is pulled out and cut to prepare the wire drawing filter stick;

the fiber tows are prepared by adopting acetate fiber tows or mixed tows of acetate fibers and polylactic acid fiber tows, applying triacetin or tributyl citrate, introducing into a special smoke gun provided with a corresponding mold, and pulling out and cutting after steam high-temperature curing and cold air shaping.