Venturi cooling filter rod production equipment and process

Abstract

The application provides a production equipment and process of a Venturi cooling filter rod. The outlet of a filament opening and gluing device is connected with a reciprocating device. A shaping core strip is fixed on the reciprocating device and drives the shaping core strip to reciprocate in and out of a cavity of a filter rod heat setting device. The outlet of the filter rod heat setting device is connected with a filter rod cold setting device. The outlet of the filter rod cold setting device is connected with a filter rod forming device. The outlet of the filter rod forming device is connected with a filter rod slitting device. After being opened and sprayed with triacetin, the acetate filament is sent into the filter rod heat setting device through a high-pressure filament feeder. The acetate filament is heated and dissolved by steam inputted into the filter rod heat setting device, and then enters the filter rod cold setting device. After being cooled and set, the acetate filament is wrapped by a cloth tape and pulled out to become a filter rod with a stable circular shape. The filter rod is cut into filter rods with a certain length through the slitting device. The equipment can be used to produce the filter rod with the Venturi structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of new special filter stick production equipment, and particularly relates to a Venturi filter stick production equipment and a use method. BACKGROUND

[0002] The advent of heat-not-burn (HNB) cigarettes represented by IQOS has brought about a change in the way of smoking for smokers and caused a major change in the tobacco industry worldwide. Heat-not-burn cigarettes have new special requirements for filter sticks, which require low suction resistance, low filtration and certain cooling effect.

[0003] In recent years, new filters for heat-not-burn cigarettes have been continuously developed, but most of them are binary or ternary structures, which have complex overall structures and high production costs.

[0004] There are also some studies on new filter sticks using the Venturi principle for cooling: CN207626542U and CN108185517A disclose a new cigarette for heat-not-burn cigarettes, which uses the Venturi principle to design a ternary composite stick composed of a reverse sink head filter stick and two hollow filter sticks with different inner diameters; CN112930121A discloses an aerosol generating system containing a Venturi element; CN212728776U and CN111387546A disclose a Venturi-type hollow filter stick for heat-not-burn cigarettes.

[0005] There is no literature report on the production equipment of Venturi sticks, and no mature Venturi stick cigarette products have been seen on the market. How to turn the design idea of Venturi sticks into reality and promote their application is a difficult problem facing researchers.

[0006] The present application aims to develop a Venturi stick production equipment that can be continuously produced industrially and meet the use of disposable heat-not-burn cigarettes, and further develop Venturi stick products. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a Venturi filter stick production equipment.

[0008] The technical solution of the present application is:

[0009] A Venturi filter stick production equipment, comprising a tow opening and gluing device, a reciprocating device, a shaping core, a filter stick heat setting device, a filter stick cold setting device, a filter stick forming device, and a filter stick slitting device, the outlet of the tow opening and gluing device is connected with the reciprocating device, the reciprocating device is fixed with the shaping core and drives the shaping core to reciprocate in and out of the cavity of the filter stick heat setting device;

[0010] The outlet of the filter stick heat setting device is connected with the filter stick cold setting device;

[0011] The outlet of the filter rod cold setting device is connected with the filter rod forming device.

[0012] The outlet of the filter rod forming device is connected with the filter rod slitting device.

[0013] The internal part of the tow opening and gluing device is provided with one or more groups of tow guide rods for realizing the feeding of the tow into the reciprocating device.

[0014] The outlet of the tow opening and gluing device is non-contact connected with the reciprocating device.

[0015] The fixed setting core rod on the reciprocating device linearly reciprocates in the central cavity of the filter rod heat setting device.

[0016] The outlet of the filter rod heat setting device is non-contact connected with the filter rod cold setting device.

[0017] The outlet of the filter rod cold setting device is non-contact connected with the filter rod forming device.

[0018] The outlet of the filter rod forming device is non-contact connected with the filter rod slitting device.

[0019] The conical part of the head of the core rod can be a single cone or a combination of two or more cones.

[0020] When the conical part is a single cone, the setting core rod is a columnar body one with a conical structure one, the head of the conical structure one is a circular arc type or a hemispherical type with a radius of 0.2-0.6 mm, the height h of the conical structure one is 0.5-3 times, preferably 1-2 times of the diameter d of the columnar body one, and the diameter d of the columnar body one is 3-6 mm.

[0021] The conical part is a combination of two or more cones. The specified core strip can also be provided with a circular table at the front end of the columnar body two, and the circular table is provided with a conical structure two. The height of the circular table and the conical structure two is the same as that of the conical structure one. The height of the conical structure two is 1-4 times the height of the circular table. The upper diameter of the circular table is 1-3 times the diameter of the bottom of the conical structure two.

[0022] The inside of the specified core strip can also be a hollow structure columnar body three. The inner diameter of the hollow part is R1=1-2mm. Two to four micropores with a diameter of R2=0.5-1.5mm are uniformly distributed around the lower conical part. R1 is greater than R2. The micropores are connected to the hollow inside of the columnar body three. The core strip tail is selectively connected to the perfume tank through a hose and a gear pump. Liquid perfume can be injected into the inner wall of the filter rod through the cavity inside the core strip.

[0023] The filter rod heat setting device comprises an inner mold one and an outer jacket one.

[0024] The inner mold one is arranged in the inner cavity of the outer jacket one, and forms a jacket inner cavity one.

[0025] The outer jacket one is provided with a jacket external interface one. The inner mold one is provided with a plurality of micropores one.

[0026] The jacket external interface one is connected to hot steam. The jacket inner cavity one is filled with hot steam. The steam is blown to the acetate tow filament bundle passing through the inner hole through the micropores on the mold, and the acetate tow filament bundle sprayed with an appropriate amount of triacetin is solidified and cured at the moment of passing.

[0027] The filter rod cold setting device comprises an inner mold two and an outer jacket two.

[0028] The inner mold two is arranged in the inner cavity of the outer jacket two, and forms a jacket inner cavity two.

[0029] The outer jacket two is provided with a jacket external interface two.

[0030] The inner mold two is provided with a plurality of micropores two.

[0031] The filter rod cold setting device is a one-section or multi-section device (or cooling cavity) connected in series, preferably 2-3 sections.

[0032] The jacket external interface two is connected to cold compressed air. The jacket inner cavity two is filled with cold air. The cold air is blown to the hot-cured acetate filter rod passing through the inner hole through the micropores two on the mold, and the hot-cured filter rod is dimensionally stable. The cold setting mold adopts one-section or multi-section cooling, preferably 2-3 section cooling setting.

[0033] The filter rod forming device is provided with a cloth belt, which is used to selectively realize the wrapping and pulling out process of the filter rod.

[0034] A smoke gun is installed at the top of the fabric belt to form the filter rod;

[0035] The filter rod forming device has an outlet non-contact connection filter rod cutting device.

[0036] When producing Venturi rods with an outer layer of forming paper, the filter rod forming device uses a normal cold glue filter rod smoke gun with a heating system, and the center line glue is preferably applied by coating or spiral spraying. When producing Venturi rods without forming paper, a filter rod smoke gun without heating and cooling, which only serves to fix the rods, is used for drawing hollow tube rods, or a normal filter rod smoke gun is used but without heating and cooling.

[0037] The production equipment for the Venturi filter rods also includes an electrical control system, used to control the transport speed of the filaments in the filament opening and gluing device, the reciprocating speed and degree of reciprocation of the reciprocating device, and the transport speed of the fabric belt in the filter rod forming device. The electrical control system uses encoders and servo motors to acquire signals from the filter rod slitting device, and then feeds back to control the opening speed, the reciprocating speed of the core strip, and the filter rod forming (fabric belt running) speed, maintaining their matching. Simultaneously, it can fine-tune the slitting position to achieve phase stability of the filter rods.

[0038] Another technical solution of the present invention is to provide a manufacturing process for a Venturi filter rod, wherein the process implemented using the aforementioned apparatus includes the following steps:

[0039] After being opened and sprayed with triacetin, the cellulose acetate bundles are fed into the filter rod heat setting device through a high-pressure feeder.

[0040] The filter rods are heated and solidified by steam input into the filter rod heat setting device, and then enter the filter rod cold setting device. After cooling and setting, they are wrapped by a cloth belt and pulled out to become a circumferentially stable filter strip shape. Then, they are cut into filter rods of a certain length by the slitting device.

[0041] The reciprocating device drives the shaping core strip in the center of the filter rod heat shaping device, achieving regular reciprocating motion.

[0042] During the regular reciprocating motion, the stroke of the reciprocating device is greater than the length of a Venturi structural unit set in the filter rod. The length of a Venturi unit is 10-50mm. The stroke of the reciprocating device (2) is 1-3 times the length of the Venturi unit, preferably 1.05-1.5 times. During the production process, the stroke of the reciprocating device remains unchanged.

[0043] Driven by the reciprocating device, when the cylindrical part of the shaping core strip enters or exceeds the heating and curing part in the heat shaping device of the fiber bundle and filter rod, the fiber bundle is heated and melted to form a filter strip with a large hollow structure.

[0044] When the semi-solidified rod is completely out of the heat setting device, the tow is solidified by heating and sticking to form a solid filter rod.

[0045] When the semi-solidified rod is completely out of the heat setting device, the tow is solidified by heating and sticking to form a solid filter rod.

[0046] Adjusting the front and back position of the semi-solidified rod on the reciprocating device can adjust the maximum depth of the semi-solidified rod into the heat setting device, and the depth of the tapered head of the semi-solidified rod in the heat setting device when it is withdrawn, and further adjust the pore size of the minimum hole in the Venturi rod (determined by the maximum diameter of the tapered portion of the semi-solidified rod in the heat setting device).

[0047] Selecting a semi-solidified rod with an internal cavity, the tail of the semi-solidified rod is connected to the flavor tank through a hose and a gear pump, and through the internal cavity of the semi-solidified rod and the micropores of the head, liquid flavor can be injected into the internal cavity of the filter rod to prepare a flavored filter rod.

[0048] The frequency of reciprocating motion of the reciprocating device is proportional to the number of Venturi units (large hole number) designed in the filter rod, which is the product of the production number of Venturi rods per unit time and the number of large holes designed in each rod.

[0049] The filter rod cold setting device is preferably composed of 2-3 sections in series to achieve cooling and fixation below 30℃. The cold setting device is 2 or more sections of cooling cavities connected together with an interval, or 2 or more non-contact cooling devices in series, and the center line of the cooling passage through which the filter rod passes must be on the same line.

[0050] During the wrapping and pulling out of the Venturi cooling filter rod by the cloth belt, the forming paper is selectively wrapped, and the cigarette gun heating process is adopted to ensure firm joint bonding; when the forming paper is not wrapped, the cigarette gun non-heating process is adopted to prevent the filter rod from being unevenly heated and bent.

[0051] The electrical control system takes signals at the cutter head motor of the slitting device, controls the transport speed of the cloth belt in the filter rod forming device, the conveying speed of the tow in the opening and gluing device, and the reciprocating speed of the reciprocating device through the encoder and servo motor, so that the above speeds are matched to ensure the stability of the filter rod quality; at the same time, the reciprocating frequency of the reciprocating device or the slitting speed of the cutter head can be adjusted separately, and then returned to normal instantaneously to adjust the phase of the filter rod; the speed of the opening device can be adjusted separately to adjust the tow opening ratio and the amount of tow to ensure the quality of the filter rod.

[0052] In the production process, the rayon tow is opened, sprayed with triacetin, sent into the heat setting device by high pressure tow feeder, then wrapped and stretched by the belt to pass through the heat setting device, the cold setting device, and then sent into the slitting device.

[0053] The starting point of the Venturi cooling filter rod production process design is the fixed proportion of the cutter head slitting frequency and the belt conveying speed, which is related to the performance of the equipment and the complexity of the Venturi structure. The cutter head slitting frequency is the same as the number of filter rods produced per minute, which is the ratio of the belt conveying speed to the filter rod length. The production speed is usually set as the belt conveying speed, which is generally adjusted between 10-100 m / min, and the preferred solution is that the speed per minute is an integer multiple of the filter rod length.

[0054] The belt conveying speed of the filter rod is the same as the speed of the filter rod after cooling and setting, which is 1.0-1.1 times the speed of the hot filter rod just out of the heat setting device, and is determined by the amount and temperature of the cold air blown into the filter rod in the cold setting device;

[0055] The speed of the rayon tow sent into the heat setting device by the high pressure tow feeder is 1.05-1.2 times the speed of the filter rod out of the heat setting device, which ensures that the tow is sent into the heat setting device in a proper curved state to meet the requirements of continuous production and filter rod quality. This can be achieved by adjusting the opening ratio of the tow and the output speed of the opener, and then adjusting the pressure drop of the Venturi cooling rod and other technical parameters to meet the process quality requirements.

[0056] That is, in the production process of the Venturi filter rod of the present application, the rayon tow is opened, sprayed with an appropriate amount of triacetin, sent into the heat setting device by the high pressure tow feeder, instantaneously dissolved, adhered and solidified by steam heating, then enters the cold setting device, and after cooling and setting, is wrapped by the belt to become a circumferentially stable filter rod shape; in this process, the reciprocating device drives the core rod to completely enter the center part of the tow and the heat setting device, and the internal diameter of the acetate filter rod will form a hollow structure with a larger internal diameter (close to the diameter of the core rod); when the core rod completely exits, the filter rod will become a solid core; when the core rod does not completely enter and exit, the filter rod will form a hollow structure with a smaller internal diameter (determined by the diameter of the tapered part of the core rod corresponding to the position of fusion and adhesion). Different movements of the reciprocating device make the core rod regularly enter and exit the heat setting device, so that a filter rod with regularly varying internal cavity diameter can be prepared, and then after slitting by the forming and slitting device and adjustment by the phase adjustment system, Venturi cooling filter rods with corresponding cavity shape and number can be continuously produced. Select a core rod with an internal hollow structure, the tail of the core rod is connected to the flavor tank through a hose and a gear pump, and liquid flavor can be injected into the internal cavity of the filter rod through the internal cavity of the core rod and the micropores at the head of the core rod to prepare a flavored filter rod.

[0057] The present application has reasonable design and unique structure, and can produce the Venturi filter rod in an industrialized and continuous manner, thereby providing a new solution for improving the quality of cigarettes and developing new tobacco products. BRIEF DESCRIPTION OF DRAWINGS

[0058] The present application will be further described in conjunction with the drawings and examples.

[0059] Figure 1 is a schematic diagram of the overall structure of the present application, wherein: 1, tow opening and gluing device, 2, reciprocating device, 3, shaping core strip, 4, filter rod heat setting device, 5, filter rod cold setting device, 6, electrical control system, 7, filter rod forming device, 71, smoke gun, 72, cloth belt, 73, forming paper, 8, filter rod slitting device.

[0060] Figure 2 is a schematic diagram of the heat setting device of the present application, wherein: 41, inner mold one, 42, outer jacket one, 43, jacket inner cavity one, 44, micro hole one, 45, jacket external interface one.

[0061] Figure 3 is a schematic diagram of the cold setting device of the present application, wherein: 51, inner mold two, 52, outer jacket two, 53, jacket inner cavity two, 54, micro hole two, 55, jacket external interface two.

[0062] Figure 4 is a schematic diagram of the shaping core strip of the present application, 31, cylindrical body one, 311, conical structure one, wherein: d, diameter of the core strip column type part or diameter of the bottom of the cone, h, height of the cone of the head part of the core strip.

[0063] Figure 5 is another schematic diagram of the shaping core strip of the present application, 32, cylindrical body two, 321, circular table, 322, conical structure two, wherein: d1, diameter of the bottom of the first cone of the head part of the core strip, h1, height of the first cone of the head part of the core strip, d2, upper diameter of the circular table, d3, diameter of the column part (diameter of the bottom of the circular table), h2, height of the circular table.

[0064] Figure 6 is another schematic diagram of the shaping core strip of the present application, 33, cylindrical body three, 331, circular table, 332, conical structure three, 34, internal cavity, 35, head micro hole, R1, inner diameter of the internal cavity 34, R2, diameter of the head micro hole. DETAILED DESCRIPTION

[0065] Example 1

[0066] A Venturi filter rod production equipment, comprising a tow opening and gluing device 1, a reciprocating device 2, a shaping core strip 3, a filter rod heat setting device 4, a filter rod cold setting device 5, a filter rod forming device 7, and a filter rod slitting device 8. The outlet of the tow opening and gluing device 1 is connected with the reciprocating device 2, the reciprocating device 2 is fixed with the shaping core strip 3, and the shaping core strip 3 is driven to reciprocate in and out of the cavity of the filter rod heat setting device 4.

[0067] The outlet of the filter rod heat setting device 4 is connected with the filter rod cold setting device 5.

[0068] The outlet of the filter rod cold setting device 5 is connected with the filter rod forming device 7.

[0069] The outlet of the filter rod forming device 7 is connected with the filter rod slitting device 8.

[0070] The tow opening and gluing device 1 is internally provided with two groups of lead screws for guiding the tow into the reciprocating device 2.

[0071] The outlet of the tow opening and gluing device 1 is non-contact connected with the reciprocating device 2.

[0072] The shaping core strip 3 fixed on the reciprocating device 2 linearly reciprocates in the central cavity of the filter rod heat setting device 4.

[0073] The outlet of the filter rod heat setting device 4 is non-contact connected with the filter rod cold setting device 5.

[0074] The outlet of the filter rod cold setting device 5 is non-contact connected with the filter rod forming device 7.

[0075] The outlet of the filter rod forming device 7 is non-contact connected with the filter rod slitting device 8.

[0076] The conical portion is a single cone (such as Figure 4 ), that is, the shaping core strip 3 is a columnar body 31 containing a cone, the diameter d of the columnar body 31 part is 3-6 mm, the head radius of the tip of the conical structure is a circular arc type of 0.2-0.6 mm, and the height of the conical structure is 1-2 times the diameter d of the cylinder.

[0077] In some embodiments, the diameter d of the columnar body 31 part, the head radius of the tip of the conical structure, and the height of the conical structure can be selected within the above ranges.

[0078] The filter rod heat setting device 4 comprises an inner mold one 41 and an outer jacket one 42.

[0079] The inner mold one 41 is arranged in the internal cavity of the outer jacket one 42, and forms a jacket internal cavity one 43.

[0080] The outer jacket one 42 is provided with a jacket external interface one 45.

[0081] The inner mold one 41 is provided with a plurality of micro-holes one 44.

[0082] The filter rod cold setting device 5 comprises an inner mold two 51 and an outer jacket two 52.

[0083] The inner mold two 51 is arranged in the inner cavity of the outer jacket two 52, and forms a jacket inner cavity two 53.

[0084] The outer jacket two 52 is provided with a jacket external interface two 55.

[0085] The inner mold two 51 is provided with a plurality of micro-holes two 54.

[0086] The filter rod cold setting device 5 is a two-section device connected in series.

[0087] The filter rod forming device 7 is provided with a cloth belt 72, which is used for selectively realizing the wrapping and pulling-out process of the filter rod.

[0088] The upper part of the cloth belt 72 is provided with a smoke gun 71, which is used for realizing the forming of the filter rod.

[0089] The outlet of the filter rod forming device 7 is non-contact connected to the filter rod slitting device 8.

[0090] The Venturi filter rod production equipment further comprises an electrical control system 6, which is used for controlling the transportation speed of the tow in the tow opening and gluing device 1, controlling the reciprocating speed and reciprocating degree of the reciprocating device 2, and controlling the transportation speed of the cloth belt 72 in the filter rod forming device 7. The speeds of the above-mentioned devices can be individually fine-tuned, and after being adjusted to the right position, they are uniformly linked in a fixed ratio.

[0091] In the above-mentioned device, the heat setting mechanism is as follows: in the filter rod heat setting device 4, 0.1-0.2 MPa steam is sent into the jacket inner cavity one 43 of the heat setting mold through the jacket external interface one 45 on the outer jacket one 42, and the high-pressure steam can enter the tow channel in the mold through the micro-holes one 44 on the inner mold, and is sprayed on the continuously passing acetate tow to which a proper amount of triacetin is added. Under high temperature, the acetate tow can be instantly dissolved and solidified into a filter rod shape. When the core rod 3 exists at this position, a filter rod with an empty core structure is formed, and the initially formed empty core has the same diameter as the core rod at this position. Under high temperature, the shape of the hot filter rod is not fixed, and it can be further thinned, and the diameter of the internal empty core will also become smaller during the stretching process, and it needs to be quickly cooled so that its circumference can be stabilized.

[0092] Cold setting mechanism: in the filter rod cold setting device 5, the cold compressed air below 20℃ is sent into the inner cavity of the cold setting mold through the outer jacket interface two 55 on the outer jacket two 52, the cold compressed air can enter the filter rod channel in the mold through the micro holes two 54 on the inner mold, and is blown to the continuously passing filter rod which has been dissolved and solidified, and the circumference of the cooled acetate filter rod can be stabilized. In order to ensure the cold setting effect, two-stage or three-stage cooling mode can be used. The two-stage cooling mode is the series connection of two filter rod cold setting devices 5 or cooling cavities. The circumference of the filter rod can be fine-tuned by adjusting the size of the cold air flow to meet the process technical requirements of the venturi cooling filter rod circumference index.

[0093] Example 2

[0094] The overall structure of the device is the same as that of example 1, only the cone part is a combination of two single cones (as shown in Figure 5 ), that is, the front end of the shaping core strip is provided with a circular table 321, and the circular table 321 is provided with a cone structure two 322; the sum of the height of the circular table 321 and the cone structure two 322 is the same as that of the cone structure one 311; the diameter d3 of the columnar body two 32 is 5mm, the upper diameter d2 of the circular table 321 is 4.5mm, the bottom diameter d1 of the cone 322 is 2.5mm, the sum of the height of the circular table 321 and the cone structure two 322 is 8mm, the height h2 of the circular table 321 is 2mm, the height h1 of the cone structure two 322 is 6mm, and the head of the conical tip is a hemisphere with a radius of 0.5mm.

[0095] Example 3

[0096] The overall structure of the device is the same as that of example 2, only the inside of the column is hollow, and the cone part is provided with micro holes connected with the hollow (as shown in Figure 6 ), that is, the front end of the shaping core strip is provided with a circular table 331, and the circular table 331 is provided with a cone structure three 332; the inside of the columnar body 33 has a hollow 34, the diameter of the hollow 34 is R1=2.0mm, three micro holes 35 are uniformly distributed in the lower part of the cone 332 along the four directions, the diameter of the micro holes 35 is R2=1.0mm, and the micro holes 35 are connected with the hollow 34. The tail of the core strip is connected with the perfume tank through a hose and a gear pump, and liquid perfume can be injected into the internal cavity of the filter rod through the internal cavity 34 of the core strip and the micro holes 35 at the head, so as to prepare a perfumed filter rod.

[0097] Example 4

[0098] The following process is carried out by using the device described in example 1, and the specific process is as follows:

[0099] The length of the cut filter rod with Venturi cooling is set to 132 mm, and there are 4 Venturi units in the filter rod, i.e. 4 large holes and 4 small holes connected alternately; the conveying speed of the tape 72 is set to 13.2 m / min, the cutting frequency of the filter rod cutting device 8 is 100 times / min, and the reciprocating frequency of the reciprocating device 2 is 400 times / min,

[0100] The reciprocating device with a stroke of 35 mm is used, the core rod with the structure of Figure 4 The diameter d of the columnar portion of the core rod is set to 4 mm, the height h of the tapered portion is set to 5 mm, the head of the tapered tip is a circular arc with a radius of 0.3 mm, and the position of the core rod 3 on the reciprocating device is adjusted so that when the core rod 3 is withdrawn to the limit, only the head of 1.5 mm remains in the heat setting device (the position corresponding to the heat solidification position is about the maximum diameter of the vertebral body portion, which is about 1.5 mm), and at this time, the initial internal cavity diameter of the filter rod formed is about 1.5 mm; when the core rod is completely inserted into the heat setting device, the head can reach a position of 36.5 mm in the heat setting device, and at this time, the columnar portion of the core rod has a length of 31.5 mm entering the heat setting device, and the initial internal cavity diameter of the filter rod formed is 4 mm.

[0101] On the single-layer, opening roll widened opening and gluing device 1 (a group of lead screws are arranged inside the tow opening and gluing device 1), the acetate tow is opened and sprayed with an appropriate amount of triacetin, and then fed into the filter rod heat setting device 4 at a speed of 14 m / min through the high-pressure feeder, instantaneously solidified and fixed by steam heating, and then enters the first filter rod cold setting device, preliminarily sets after being cooled by cold air, and then enters the second filter rod cold setting device, and after the filter rod is completely set, it is wrapped by the tape 72 and pulled out at a speed of 13.2 m / min, and a drawing rod cigarette gun without heating device only for fixing or a normal filter rod cigarette gun without heating function can be used to form a stable paperless filter rod shape. In this process, the reciprocating device 2 drives the setting core rod 3 to enter and exit the center of the tow and heat setting device at a frequency of 400 times / min, so that a filter rod with a large hole with a maximum diameter of about 3.8 mm and a small hole with a minimum diameter of about 1.2 mm alternately appearing in a length of 33 mm can be prepared, and after being formed by the cigarette gun 71, cut by the cutting device 8, and adjusted by the phase adjustment system 6, a paperless Venturi cooling filter rod with a length of 132 mm, 4 Venturi structure units, and a process set can be continuously produced.

[0102] In the above process, the production speed and frequency of each device are adjusted in the same proportion, i.e. the same proportional rise and fall, and the filter rod produced has the same structure and quality close to consistent.

[0103] According to the above process, different specifications, matched smoke gun, cloth tape, heat setting device, cold setting device, different thickness of core strip and corresponding specification of acetate tow can be used to produce a series of different thickness and inner diameter, length of 132 mm, 4 Venturi structure unit of paperless cooling filter rod. Adjusting the front and back position of the core strip on the reciprocating device can adjust the size of the minimum pore size and the pressure drop of the filter rod, and prepare Venturi cooling filter rods with different pressure drop indexes.

[0104] Example 5

[0105] In Example 4, the length of the filter rod is set to 96 mm, 100 mm, 108 mm, and 120 mm, respectively. Correspondingly, the conveying speed of the cloth tape 72 is adjusted to 9.6 m / min, 10 m / min, 10.8 m / min, and 12 m / min, respectively, the speed of the tow feeding into the heat setting device is adjusted to 10.2 m / min, 10.6 m / min, 11.5 m / min, and 12.8 m / min, respectively, and other parameters remain unchanged. 96 mm, 100 mm, 108 mm, and 120 mm long, 4 Venturi structure unit of cooling filter rods can be produced respectively.

[0106] Example 6

[0107] In Examples 4-5, the frequency of the reciprocating device is increased to 600 times / min or 800 times / min, respectively, and other parameters remain unchanged. 132 mm, 96 mm, 100 mm, 108 mm, and 120 mm long, 6 and 8 Venturi structure units of cooling filter rods can be produced, respectively.

[0108] Example 7

[0109] In Example 4, the single-layer, opening roll with widened opening and gluing device is replaced by a double-layer, normal-width opening roll gluing device; the two separate, series-connected cold setting devices are replaced by a group of cold setting devices with two cooling inner cavities inside; and two strands of acetate tow that meet the process requirements are selected.

[0110] In the double-layer opening and gluing device 1, two strands of acetate tow are opened and sprayed with an appropriate amount of triacetin, then mixed together by the guide rod, and then sent to the filter rod heat setting device 4 through the high-pressure feeder. After instantaneously dissolving, adhering and solidifying by steam heating, it enters the cold setting device with two cooling inner cavities, and after cooling and setting by cold air, the filter rod circumference is completely set. After being wrapped by the cloth tape 72, it becomes a stable filter strip shape; keeping other processes and Example 4 the same, the same Venturi cooling filter rods as Example 4 can also be produced.

[0111] Example 8

[0112] In Example 4, a cold setting device is added, and other parameters remain unchanged, the same product as in Example 4 can be produced, but the circumferential adjustment precision is increased, and the range is larger.

[0113] Example 9

[0114] In the process of Example 4, the structural core strip of Example 2 is used, and other processes remain unchanged, the same product as in Example 4 can be produced, but the shape of the filter rod cavity changes from a single taper similar to the product of Example 4 to a complex taper similar to the product of Example 4, and a platform appears during the transition from a small hole to a large hole. The filter rod wrapped in this structure will form a turbulent structure when the smoke comes out of the small hole during smoking, and the cooling effect will be further improved.

[0115] Example 10

[0116] In the process of Example 9, the structural core strip of Example 3 is used, the tail of the core strip is connected to the flavor tank through a hose and a gear pump, and other processes remain unchanged. During production, liquid flavor is injected into the internal cavity of the filter strip through the internal cavity 34 of the core strip and the micropores 35 at the head, and a Venturi cooling filter rod with internal wall flavoring can be produced, which has the same specifications and Venturi units as Example 9.

[0117] The liquid flavor is replaced by a gel cooling material or a flavor containing a gel phase change material, which is heated above the melting point to become a liquid, and can also be injected into the filter rod through this core strip to produce a Venturi filter rod containing a gel phase change material and flavor inside. The gel material is solid at room temperature, and the flavor locking effect is better. During smoking, the gel material can also absorb part of the heat, and the cooling effect is better.

[0118] Examples 11-17

[0119] In Examples 4-10, a layer of filter rod forming paper 73 is added to the tape 72, and a cold glue gun is used to heat the process, and the forming paper is included outside the filter rod during the forming process, and a Venturi cooling filter rod with the same specifications and structure as Examples 4-10 but wrapped with forming paper can be prepared.

Claims

1. The manufacturing process of Venturi cooling filter rods, characterized in that, Includes the following steps: After being opened and sprayed with triacetin, the cellulose acetate bundles are fed into the filter rod heat setting device (4) through a high-pressure feeder. The filter rod is heated and solidified by the steam input into the filter rod heat setting device (4), and then enters the filter rod cold setting device (5). After cooling and setting, it is wrapped by the cloth belt (72) and pulled out to become a circumferentially stable filter strip shape. Then it is cut into filter rods of a certain length by the slitting device. The reciprocating device (2) drives the shaping core strip (3) in the center of the filter rod heat shaping device (4) to achieve reciprocating motion. Under the drive of the reciprocating device (2), when the cylindrical part of the shaping core strip (3) enters or exceeds the melting and solidification part of the filament bundle and the filter rod heat shaping device (4), the filament bundle is heated and melted to form a filter strip with a large hollow structure. When the core strip (3) to be shaped is completely removed from the filter rod heat-setting device (4) by the reciprocating device (2), the filament bundle is heated and solidified to form a solid filter strip; The cylindrical part of the core strip (3) is removed from the heat-setting device (4) of the filter rod by the reciprocating device (2), while the conical part of the head of the core strip is still inside the heat-setting device (4). The conical part of the core strip forms an inner hole with a conical structure during the process of entering and exiting the heat-setting device (4). The core strip (3) with an internal cavity (34) is selected. The tail of the core strip is connected to the fragrance box through a hose and a gear pump. Liquid fragrance can be injected into the internal cavity of the filter strip through the internal cavity (34) of the core strip and the micropore (35) of the head to prepare a fragrance filter rod. The production equipment used in the process includes a filament opening and gluing device (1), a reciprocating device (2), a shaping core strip (3), a filter rod heat shaping device (4), a filter rod cold shaping device (5), a filter rod forming device (7), and a filter rod slitting device (8). The outlet of the filament opening and gluing device (1) is connected to the reciprocating device (2). The reciprocating device (2) has a shaping core strip (3) fixed on it and drives the shaping core strip (3) to reciprocate inside and outside the chamber of the filter rod heat shaping device (4). The outlet of the filter rod heat setting device (4) is connected to the filter rod cold setting device (5); The outlet of the filter rod cold setting device (5) is connected to the filter rod forming device (7); The outlet of the filter rod forming device (7) is connected to the filter rod cutting device (8).

2. The production process according to claim 1, characterized in that, The filament opening and gluing device (1) is equipped with one or more sets of guide rods to feed the opened and glued filaments into the reciprocating device (2); The outlet of the filament opening and gluing device (1) is connected to the reciprocating device (2) in a non-contact manner; The shaping core strip (3) fixed on the reciprocating device (2) moves linearly back and forth in the central chamber of the filter rod heat shaping device (4); The outlet of the filter rod heat setting device (4) is connected to the filter rod cold setting device (5) in a non-contact manner; The outlet of the filter rod cold setting device (5) is connected to the filter rod forming device (7) in a non-contact manner; The outlet of the filter rod forming device (7) is connected to the filter rod cutting device (8) in a non-contact manner.

3. The production process according to claim 1 or 2, characterized in that, The shaping core strip (3) is a columnar body (31) containing a conical structure (311). The head of the conical structure (311) is an arc or hemispherical shape with a radius of 0.2-0.6 mm. The height h of the conical structure (311) is 0.5-3 times the diameter d of the columnar body (31). The diameter d of the columnar body (31) is 3-6 mm.

4. The production process according to claim 3, characterized in that, The height h of the cone structure (311) is 1-2 times the diameter d of the columnar structure (31).

5. The production process according to claim 3, characterized in that, The shaping core strip (3) can also have a frustum (321) at the front end of the columnar body two (32), and a cone structure two (322) is provided on the frustum (321); the sum of the heights of the frustum (321) and the cone structure two (322) is the same as that of the cone structure one (31); the height of the cone structure two (322) is 1-4 times the height of the frustum (321); the upper diameter of the frustum (321) is 1-3 times the bottom diameter of the cone structure two (322).

6. The production process according to claim 5, characterized in that, The core strip (3) can also be a hollow columnar body (33) with an inner diameter R1=1-2mm in the inner cavity (34). There are 2-4 micropores (35) with a diameter R2=0.5-1.5mm evenly distributed around the lower part of the cone. R1 is greater than R2. The micropores (35) are connected to the inner cavity (34) inside the columnar body. The tail of the core strip is selectively connected to the fragrance box through a hose and a gear pump. Liquid fragrance can be injected into the inner cavity of the filter rod through the cavity inside the core strip.

7. The production process according to claim 1, characterized in that, The filter rod heat setting device (4) includes an inner mold (41) and an outer jacket (42). The inner mold (41) is set in the inner cavity of the outer sleeve (42) and forms the inner cavity (43) of the sleeve. The outer sleeve 1 (42) is provided with an outer sleeve external interface 1 (45); The inner mold (41) is provided with multiple micro-holes (44).

8. The production process according to claim 1, characterized in that, The filter rod cold setting device (5) includes an inner mold (51) and an outer jacket (52). The inner mold 2 (51) is set in the inner cavity of the outer sleeve 2 (52) and forms the inner cavity 2 (53) of the sleeve. The outer sleeve 2 (52) is provided with the outer sleeve external interface 2 (55); Multiple micro-holes (54) are provided on the inner mold (51); The filter rod cold setting device (5) is a series connection of one or more devices.

9. The production process according to claim 8, characterized in that, The filter rod cold setting device (5) consists of 2-3 sections connected in series.

10. The production process according to claim 1, characterized in that, The filter rod forming device (7) is provided with a cloth belt (72), which is used to selectively realize the wrapping and pulling out process of the filter rod; A smoke gun (71) is provided on the upper part of the cloth belt (72) to form the filter rod; The filter rod forming device (7) has a non-contact connection to the filter rod cutting device (8) at its outlet.

11. The production process according to claim 1, characterized in that, The production equipment for the Venturi filter rod also includes an electrical control system (6), which controls the conveying speed of the filament in the filament opening and gluing device (1), controls the reciprocating speed of the reciprocating device (2), controls the conveying speed of the cloth belt (72) in the filter rod forming device (7), and controls the cutting speed of the cutter head in the cutting device (8).

12. The production process according to claim 1, characterized in that, During the reciprocating motion, the stroke of the reciprocating device (2) is greater than the length of a Venturi unit in the filter rod of the process design. The length of a Venturi unit is 10-50mm. The stroke of the reciprocating device (2) is 1-3 times the length of the Venturi unit. During the production process, the stroke of the reciprocating device remains unchanged.

13. The production process according to claim 12, characterized in that, The travel distance of the reciprocating device (2) is 1.05-1.5 times the length of the Venturi unit.

14. The production process according to claim 1, characterized in that, The frequency of the reciprocating motion of the reciprocating device (2) is proportional to the production speed and the number of Venturi units designed in the filter rod. It is the product of the number of Venturi rods produced per unit time and the number of large holes designed in each rod.

15. The production process according to claim 1, characterized in that, The filter rod cold setting device (5) is composed of one or more sections connected in series to achieve cooling and fixing at 30°C and below.

16. The production process according to claim 15, characterized in that, The filter rod cold setting device (5) consists of 2-3 sections connected in series.

17. The production process according to claim 1, characterized in that, During the process of being pulled out by the cloth strip (72), the forming paper is selectively used for wrapping, and the smoke gun heating process is used to ensure that the joint is firmly bonded; when the forming paper is not selectively used for wrapping, the smoke gun non-heating process is used to prevent the filter rod from bending due to uneven heating.

18. The production process according to claim 1, characterized in that, The device also includes an electrical control system (6), which takes a signal from the cutter motor of the slitting device (8) and controls the transport speed of the cloth belt (72) in the filter rod forming device (7), the conveying speed of the filament bundle on the opening and gluing device (1), and the reciprocating speed of the reciprocating device (2) through the encoder and servo motor, so that the above speeds are matched and thus ensure the stability of the filter rod quality; at the same time, only the reciprocating frequency of the reciprocating device (2) or the slitting speed of the cutter head on the slitting device (8) is adjusted to realize instantaneous restoration to normal to adjust the phase of the filter rod; the filament bundle opening ratio and the filament feeding speed of the opening device (1) are adjusted to ensure the quality of the filter rod.

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