A cooling belt-shaped fabric and its preparation method and application

Abstract

A cooling belt-shaped fabric is a structure woven from yarns, the surface of the yarns is covered with abundant hairiness, and the hairiness and the yarn woven structure form numerous longitudinal and transverse channels to prolong the time for smoke to pass through. The yarns contain acetate fibers and polylactic acid fibers, and the yarn woven structure includes a structure formed by plying fancy yarns and a structure woven from ply yarns. The fancy yarns include ring yarns, chenille yarns, bamboo yarns, and loop yarns. The preparation method of the cooling belt-shaped fabric includes spinning and weaving, wherein the control of the amount of yarn hairiness is reduced during spinning to achieve a surface with abundant hairiness; and different numbers of yarns and weaving machines are determined during weaving. Acetate fibers and polylactic acid fibers are green, environmentally friendly, renewable, and have a strong ability to remove harmful substances in cigarette smoke. Acetate fibers can support the woven structure in the cooling section, solving the problem of polylactic acid fibers blocking the smoke channel and increasing the inhalation resistance after melting.

Description

Technical Field

[0001] The invention belongs to the field of tobacco, and relates to a cooling belt-shaped fabric for a non-burning cigarette filter and a preparation method thereof. Background Art

[0002] Non-burning cigarettes are a new type of tobacco product that uses a heat source to heat tobacco, distill and crack the tobacco in a non-burning state, and produce smoke for people to smoke. Non-burning cigarettes release flavor substances while significantly reducing harmful substances, ensuring the health and smoking experience of smokers.

[0003] When smoking the currently commercially available burning cigarettes, the temperature of the smoke entering the mouth has dropped to 35-40°C due to the cooling effect of the unburned cigarettes and the filter rods that do not participate in the combustion. However, in the first 2-3 puffs of the puff, the smoke temperature at the filter end can reach up to 70-80°C. The smoker does not feel the burning because the smoke is relatively dry. Although the aerosol produced by non-burning cigarettes has a lower temperature itself, due to the low heating temperature, high water content of the smoke, and shortened smoke passage, the sensory temperature of the mainstream smoke reaching the mouth is still higher than that of traditional burning cigarettes. When deeply inhaled, the mouth will be burned, affecting the smoking experience. How to reduce the smoke temperature of non-burning cigarettes has become a difficult problem for domestic and foreign cigarette manufacturers.

[0004] The article "Development of a new type of coaxial core filter rod with woven fabric structure" ([1] Ling Li, Ma Yanxue, Zhang Jianchao, et al. Development of a new type of coaxial core filter rod with woven fabric structure [J]. Industrial Textiles, 2020, 38(1):5.) uses tubular weaving technology to weave acetate fiber tow to prepare a new type of coaxial core filter rod with woven fabric structure. The raw material is acetate fiber tow, and the main purpose is to improve the filtering effect. Patent CN212396139U mentions a rolled spiral cooling filter structure, which is made of pure polylactic acid, natural cellulose, acetate fiber, etc., woven into a flat woven fabric and then rolled into a filter rod. The rolling molding process is complicated. During the rolling process, the thickness of the outermost layer of fabric will affect the roundness of the filter tip. At the same time, the use of a single polylactic acid fiber is easy to collapse and adhere after heating, thereby increasing the suction resistance. Patent CN210580972U prepares a cooling section formed by weaving three polylactic acid strips in a heat-not-burn cigarette. CN207604513U uses a polylactic acid fiber bundle weaving cooling structure in aerosol generating articles, and the braided tube contains at least one longitudinal straight-through channel, which can be used to fill fiber bundles, another fiber braided tube with suitable diameter or a curled phase change fiber material sheet to enhance the smoke cooling effect. CN108685192A A degradable odor-generating element for non-combustion smoke and a cigarette product in which several polylactic acid monofilaments are woven into a rope or knitted fabric. CN207341181U A hollow braided tube woven from polylactic acid bundles is prepared in an electric heating cigarette, and a hollow polylactic acid straw is built in. CN109846085A A method for preparing a mesh polylactic acid wire mesh cigarette filter rod is to weave the cross-linked polylactic acid bundles into a mesh polylactic acid wire mesh, and then compound it into a polylactic acid mesh filter rod base rod through a filter rod forming machine.

[0005] The above-mentioned patents all weave polylactic acid tows into filter rods in different ways for use in smoke cooling of non-combustion cigarettes, but there is a problem that the polylactic acid tows will block the smoke passage and increase the inhalation resistance after melting. Some use internal cavity addition, perforation, and support structure addition to solve the problem of smoke passage blocking, but the effect is not good and the structure is complex, so it is not practical. In addition, the raw materials used in the above patents are all fiber tows, which have a smooth surface and poor cooling effect.

[0006] CN212396139U mentions a rolled spiral cooling filter structure, which is made of pure polylactic acid, natural cellulose, acetate fiber, etc., woven into a flat braided fabric and then rolled into a filter rod. The rolling molding process is complicated. During the rolling process, the thickness of the outermost layer of fabric will affect the roundness of the filter tip. At the same time, a single polylactic acid fiber is used, which is easy to collapse and adhere after heating, thereby increasing the suction resistance. CN207604513U uses a polylactic acid fiber bundle weaving cooling structure in aerosol generating articles. The braided tube contains at least one longitudinal straight-through channel, which can be used to fill the fiber bundle, another fiber braided tube with a suitable diameter, or a curled phase change fiber material sheet to enhance the smoke cooling effect. However, there is a problem that the polylactic acid bundle blocks the smoke channel after melting and increases the suction resistance. Other structures such as internal cavity and bundle need to be added to solve the problem of blocking the smoke channel, but the effect is not good and the structure is complicated. It is not practical, and the filament braiding does not have the feather effect of the yarn. Summary of the invention

[0007] In view of the deficiencies in the prior art, the technical problem that the present invention intends to solve is to provide a cooling belt-like fabric for non-combustion cigarette filters and a preparation method thereof. The cooling belt-like fabric is applied to non-combustion cigarette filters and has the characteristics of good cooling effect, good filtration, small suction resistance, simple structure, good roundness, etc.; the preparation method of the cooling belt-like fabric has the characteristics of simple process, high efficiency, low cost, stable product quality, and convenience for industrial production.

[0008] The technical solution of the present invention to solve the technical problem is: a cooling belt-shaped fabric can be used for the cooling section of a non-combustion cigarette filter. The cooling belt-shaped fabric is made of ordinary ring-spun yarns blended with acetate fiber and polylactic acid fiber in different proportions, and chenille yarns, bamboo yarns, loop yarns and other fancy yarns are ply-plied to form a plied yarn, which is woven from the plied yarns.

[0009] The acetate fiber has a fineness of 1.2-8.0D and a length of 30-70mm, and the polylactic acid fiber has a fineness of 1.5-8.0D and a length of 30-70mm.

[0010] The yarn fineness is 20tex-100tex, the yarn twist is 15-80 / 10cm, the acetate fiber accounts for 20%-80% of the yarn, and the polylactic acid fiber accounts for 80%-20%.

[0011] The spinning process of the yarn blended with acetate fiber and polylactic acid fiber in different proportions is as follows:

[0012] (1) Opening: the opening process is to open the acetate fiber and the polylactic acid fiber respectively for 1-2 times, and then mix and open for 2-3 times, the opening time is 2-3 minutes, and the licker-in roller speed is 350-550r / min

[0013] (2) Combing: The combing process is to use a flat carding machine to humidify the opened fibers 12-24 hours in advance, and the number of combing times is 2-3 times. During the combing, the cylinder speed is 500-620 r / min, the doffer speed is 8-10 r / min, the web speed is 4.5-5.5 r / min, and the fiber web weight is 18-24 g / 0.75 m.

[0014] (3) Drawing: The drawing process is as follows: the first drawing is done with 3-4 strands, the second and third drawing are done with 5-6 strands, the spacing of the three rollers is 72-74 mm, 70-72 mm and 80-82 mm respectively, the total drafting speed is 5.50-6.00, the drafting multiple of the front zone is 4.35-4.65, the drafting multiple of the middle zone is 1.00-1.05, the drafting multiple of the back zone is 1.10-1.15, the sliver delivery speed is 5.50-6.00 r / min, and the sliver delivery weight is 18-24 g / 5 m.

[0015] (4) Coarse yarn, the coarse yarn process is as follows: the total drafting speed is 5.50-7.50, the coarse yarn quantity is 6.00-7.00g / 10m, the twist coefficient is 80-85, the spindle speed is 440r / min-550r / min, and the spindle yarn dropping speed is 340r / min-440r / min.

[0016] (5) Spun yarn, wherein the spun yarn process is as follows: the twist coefficient is 15-80 / 10cm, the yarn number is 20-100tex, the wire ring number is 100-240mg, the twist direction is S twist or Z twist, the spindle speed is 8000-10000r / min, the yarn delivery speed is 10-16m / min, and the yarn hairiness is controlled at 100-300 yarns / 50m.

[0017] The spinning method in step (5) is ring spinning; if other yarns are used, other types of spinning machines need to be used, for example, chenille yarn uses a chenille spinning machine, bamboo yarn uses a ring spinning machine, and loop yarn uses a fancy twisting machine. The specific process parameters can be adjusted according to actual needs.

[0018] Optionally, the number of yarn plies is 3-18.

[0019] Optionally, the cooling belt fabric has a diameter of 5mm-8mm and a gram weight of 0.90-1.50g / 10cm, and is woven from 8-32 strands of ply yarn on a braiding machine.

[0020] Weaving to form a filter rod requires it to have a certain diameter, density, weight, etc. The weaving angle, weaving pitch, and weaving density are determined based on the specific situation of the filter rod, which will not be elaborated here.

[0021] The cooling belt fabric is woven from yarns, the surface of which is covered with abundant hairiness. The hairiness and three-dimensional weaving structure provide more longitudinal and transverse channels for the smoke, thereby increasing the time for the smoke to pass through, increasing the heat exchange between the smoke and the outside world, and enhancing the cooling capacity of the cooling belt fabric.

[0022] The polylactic acid fiber is a thermoplastic fiber with a phase change effect. When the smoke temperature exceeds the phase change temperature of the polylactic acid fiber, the polylactic acid fiber melts and absorbs heat to cool the smoke; the acetate fiber in the yarn will not melt at the smoke temperature, and can support the woven structure in the cooling section, solving the problem of polylactic acid fiber blocking the smoke channel and increasing the suction resistance after melting. The cooling section also has good filtration properties. The acetate fiber contained in the yarn is used for ordinary burning cigarette filters, and has a high filtration and adsorption rate for harmful substances such as nicotine, hydrogen cyanide, acrolein, and formaldehyde in the smoke; the polylactic acid fiber contained in the yarn has a rough surface and micropores, which can adsorb certain harmful substances in the smoke, and the polylactic acid fiber has a strong affinity for polar substances, and can react chemically with tar components and low molecular weight substances in the smoke. The reactants will remain firmly on the fiber surface, enhancing its filtration effect.

[0023] The cooling belt-shaped fabric is used in non-burning cigarette filters. The cooling belt-shaped fabric is wrapped with wrapping paper to stabilize its shape.

[0024] Compared with the prior art, the beneficial effects of the present invention include: ordinary ring yarn, chenille yarn, bamboo yarn, loop yarn and other fancy yarns and three-dimensional woven structures blended with polylactic acid fiber and acetate fiber are used. Polylactic acid fiber has a phase change effect. When the smoke temperature exceeds the phase change temperature of polylactic acid fiber, the polylactic acid fiber melts and absorbs heat to cool the smoke; in addition to having good filtering performance, acetate fiber will not melt at the smoke temperature, and can play a role in supporting the woven structure in the cooling section, solving the problem of polylactic acid fiber blocking the smoke channel and increasing the suction resistance after melting. At the same time, the content of polylactic acid fiber in the blended yarn can be changed according to the actual cooling needs and melting degree to achieve the best suction experience. The yarn with hairiness on the surface and the cavity filled with hairiness can slow down the speed of smoke passing through the filter rod. The spiral cavity in the center of the three-dimensional woven structure and the spiral gap formed by weaving increase the smoke flow path, allowing the smoke to have sufficient time to exchange heat with the outside world, thereby enhancing the cooling effect. The method for preparing the cooling belt-shaped fabric has the characteristics of simple process, high efficiency, low cost, stable product quality, and convenience for industrial production. In addition, acetate fiber and polylactic acid fiber are green, environmentally friendly, renewable, and have strong ability to remove harmful substances in cigarette smoke, and are widely used in the market.

[0025] The principles of the present invention include:

[0026] 1. Research from the perspective of heat transfer. By enhancing the heat transfer capacity of the cigarette holder material, the heat exchange between the high-temperature smoke passing through the cigarette holder and the ambient air is promoted to achieve the purpose of cooling the smoke. There are three ways of heat transfer: heat conduction, heat convection, and heat radiation. In the actual application of the present invention, all three forms of heat transfer exist, but heat conduction and heat convection are the main ones. The weaving structure of the cooling belt fabric and the hairiness of the yarn make the internal specific surface area of ​​its cooling section larger. A large specific surface area means that more smoke compound molecules can stay on the fiber surface. At this time, the smoke compound molecules have more opportunities to transfer part of the heat to the outside;

[0027] 2. Matter usually exists in three states, namely solid, liquid and gas. The process of changing from one state to another is called phase change. During the phase change process, the temperature of the substance remains unchanged or approximately unchanged (the temperature at which the phase change occurs is called the phase change temperature), but it absorbs or releases a large amount of energy, which is called the latent heat of phase change. Phase change materials are substances that change the state of matter and provide latent heat when the temperature remains unchanged. Considering the characteristics that the temperature of the phase change material itself remains unchanged during the phase change process, and it also absorbs or releases a large amount of energy, the phase change material can be used for cooling. Phase change materials with specific phase change temperatures are selected for the filter of non-combustible cigarettes. When the smoke generated by non-combustible cigarettes with a certain temperature passes through the filter made of phase change materials, the phase change material in the filter will undergo a phase change process at the phase change temperature, which will make the temperature of the phase change material itself not change but absorb the heat brought by the smoke. The heat of the smoke is absorbed and the temperature will naturally drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a longitudinal physical picture of an embodiment of the cooling belt-shaped fabric of the present invention.

[0029] Figure 2 This is a cross-sectional view of an embodiment of the cooling belt-shaped fabric of the present invention.

[0030] Figure 3 It is a schematic structural diagram of an embodiment of a cooling belt-shaped fabric of the present invention.

[0031] Figure 4 The present invention is a flow chart of the process for preparing the cooling belt-shaped fabric.

[0032] Figure 5A This is a physical picture of an embodiment of the ring yarn of the present invention.

[0033] Figure 5B This is a physical picture of an embodiment of chenille yarn of the present invention.

[0034] Figure 6 It is a cross-sectional schematic diagram of an embodiment of the internal cavity structure of the cooling belt-shaped fabric of the present invention.

[0035] Markings in the figure: 1-air flow channel one; 2-air flow channel two; 3-air flow channel three; 4-air flow channel four; 5-air flow channel five.

[0036] Figure 7 It is an overall schematic diagram of an embodiment of the present invention in which the polylactic acid fibers in the cooling belt-shaped fabric are melted.

[0037] Figure 8 It is a partial schematic diagram of an embodiment of the present invention after the polylactic acid fibers in the yarn are melted.

[0038] Fig. 9 The present invention is a specific implementation of a cooling belt-shaped fabric in a filter.

[0039] Markings in the figure: 11 - two-layer wrapping paper; 12 - acetate fiber bundle segment; 13 - cooling belt fabric segment; 14 - tobacco segment. DETAILED DESCRIPTION

[0040] The belt-shaped fabric of the present invention is formed by plying common ring yarn and fancy yarns such as chenille yarn, bamboo yarn, and loop yarn, which are blended in different proportions of acetate fiber and polylactic acid fiber, and then plying to form a ply yarn, and the ply yarn is woven. The cooling belt-shaped fabric is woven from yarns, and the surface of the yarns is covered with abundant hairiness. The hairiness and the three-dimensional woven structure provide more longitudinal and transverse channels for the flue gas, thereby increasing the time for the flue gas to pass through, increasing the heat exchange between the flue gas and the outside world, and enhancing the cooling capacity of the cooling belt-shaped fabric. The polylactic acid fiber is a thermoplastic fiber with a phase change effect. When the flue gas temperature exceeds the phase change temperature of the polylactic acid fiber, the polylactic acid fiber melts and absorbs heat to cool the flue gas; in addition to having good filtering performance, the acetate fiber will not melt at the flue gas temperature, and can play a role in supporting the woven structure in the cooling section, solving the problem of the polylactic acid fiber blocking the flue gas channel and increasing the suction resistance after melting. The process includes the following: 1. Designing the fineness and length of acetate fiber and polylactic acid fiber, as well as the fineness and twist of the yarn, and the mixing ratio of acetate fiber and polylactic acid fiber; 2. The spinning steps include: opening → combing → drawing → coarse yarn → fine yarn; 3. Designing the fineness of the plied yarn and drawing the yarn; 4. Designing the diameter of the cooling belt fabric and the number of braided roots, and the cooling belt fabric can be obtained on a braiding machine.

[0041] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0042] like Figure 1 As shown, the cooling belt fabric has a very obvious woven structure and good porosity. The surface can be wrapped with forming paper. After wrapping, the smaller spiral hollow channel in the middle will be full of hairiness, and the forming paper provides a certain strength. In actual production, it can be cut into 10mm-30mm lengths, and the wire bundles at both ends are combined to form a complete filter rod.

[0043] There are small spiral hollow channels in the woven structure of the cooling belt fabric, which ensure the passage of smoke after the polylactic acid is melted. The smoker can inhale more smoothly, with less inhalation resistance and lighter unit gram weight.

[0044] Figure 2 The figure shows a cross-section of a cooling belt-shaped fabric, in which the surface of the yarn is covered with very rich hairiness. The smoke has more contact with the yarn when passing through, which slows down the speed of the smoke passing through the filter rod and increases the time the smoke stays in the braided tube, so that the smoke can be cooled more effectively.

[0045] The effect of the braided structure is as follows Figure 3 As shown, it can be seen that the whole is a solid structure, and at the same time contains many gaps, giving the airflow a variety of passages (the channels and cavities can be roughly marked in this figure).

[0046] Figure 4 The flowchart of the preparation of the cooling belt fabric of the present invention is shown. The actual preparation process can conform to that shown in the figure, but is not limited thereto, and at least one of them conforms to that shown in the figure. The preparation process is generally divided into two links, spinning and weaving. In the spinning process, in order to achieve the hairiness effect required for the fabric, the control of the yarn hairiness should be appropriately reduced compared to the normal spinning process, so as to achieve a surface rich in hairiness. According to the different fineness of the yarn combined with the weaving effect of the weaving machine, different numbers of roots can be selected for weaving. Generally, 8-32 roots can be selected for weaving. In order to achieve a diameter of 5.0mm-8.0mm, in actual operation, 3-18 yarns can be combined by a doubling machine, and the strands are then woven with 8-32 strands to achieve the required diameter. The cooling belt fabric is woven by strands. When weaving with yarns of different finenesses, different numbers of strands should be used for weaving. The porosity of cooling belt fabrics with different numbers of roots will change, and the smoothness of its surface, the number of hairiness contained inside and on the surface will also be different, and the cooling effect will also change accordingly.

[0047] Figure 5 shows the appearance of the two types of yarns, with multiple hairs on the surface of the yarns. The smoke flows between the hairs, increasing the contact area with the smoke, slowing down the smoke flow rate, and further enhancing the cooling effect of the cooling belt fabric. The yarn has a certain strength, and the unique twist on the yarn surface also makes it different from the smooth surface of the yarn with a tow braided structure.

[0048] In theory, smoke flows along a set channel in the woven structure, and the gaps in the woven structure allow the smoke to form multiple channels of different shapes in the longitudinal or transverse direction. However, the air flow channels are not limited to this, and there are many possibilities. Figure 6 Only one possible configuration is shown, including air flow channels one to five numbered 1-5 as shown in the figure.

[0049] like Figure 7The schematic diagram shows the melting of the polylactic acid fibers in the cooling belt fabric after the smoke passes through. The braided tube after melting can be as shown in the figure, but is not limited thereto, and at least one of them conforms to the one shown in the figure.

[0050] Figure 8 The figure shows a partial schematic diagram of yarn melting, and the dotted part is the melting area. After being heated, the blended yarn will have different melting states, which can be the front, middle or back, or it can melt from the inside and appear hollow, which is conducive to improving the cooling effect of the cooling belt fabric.

[0051] Fig. 9 The use mode and use position of the cooling belt-shaped fabric in the filter tip are shown in the figure. As can be seen from the figure, the present invention has various use modes, and other structure filter rods such as fiber bundles and cavities can be added at both ends, and wrapping paper can also be added on the surface to stabilize its shape. The use mode of the cooling belt-shaped fabric can be one of the modes shown in the figure, or none of the modes.

[0052] Example 1

[0053] (1) The fiber fineness of the polylactic acid fiber is 3.5D and the length is 55 mm, and the fiber fineness of the acetate fiber is 3.0D and the length is 60 mm.

[0054] (2) Spinning: Use a small cotton opener to open the two types of fibers twice respectively, and then mix and open them twice, with the licker-in roller rotating at 400 r / min;

[0055] Use AS181A carding machine, cylinder speed 550r / min, doffer speed 9r / min, web speed 5.0r / min, fiber web weight 20g / 0.75m;

[0056] DSDr-01 drawing frame is used, with 3 draws for the first draw, 6 draws for the second draw, and 6 draws for the third draw. The drawing roller gauges are 70mm, 72mm and 80mm respectively. The total drafting speed is 6.00, the drafting multiple of the front zone is 4.50, the drafting multiple of the middle zone is 1.12, the drafting multiple of the back zone is 1.15, the sliver delivery speed is 6.00r / min, and the sliver delivery weight is 21g / 5m;

[0057] The DSRo-01 roving frame was used, with a total drafting speed of 7.57, a roving weight of 6.00 / 10m, a twist coefficient of 80, a spindle speed of 500r / min, and a spindle doffing speed of 400r / min;

[0058] Use DSSp-01 spinning frame, twist coefficient is 60 / 10cm, number is 20tex, wire ring number is 140mg, twist direction is z twist, spindle speed is 8000r / min, sliver speed is 12m / min, yarn hairiness is controlled at 210 / 50m;

[0059] The spinning ratio is 20tex blended yarn with acetate fiber / polylactic acid fiber of 50% / 50% and twist of 40 / 10cm.

[0060] (3) Using a high-speed doubling machine, 30 yarns are doubling into one strand, with a delivery speed of 6 m / min and a tension of 1 tension disk;

[0061] (4) A 16-spindle high-speed braiding machine is used, the number of braided strands is 16, the diameter of a single strand is 1.12 mm, the braiding angle is 70°, the braiding pitch is 10 mm, and the braiding density is 90%, thereby obtaining a cooling belt-shaped fabric.

[0062] The cooling performance of the cooling belt fabric of Example 1 was tested, and the test results are shown in Table 1. It can be seen from Table 1 that the acetate fiber / polylactic acid fiber is 50% / 50%, and the cooling belt fabric can effectively reduce the smoke temperature by 80°C-90°C, and the cooling range is large and stable, and it still has a certain cooling effect after multiple puffs.

[0063] The specific method of cooling performance test is: use common cigarettes, air heater, air pump, flow meter, temperature sensor and other equipment to build it by yourself, which will not be elaborated here.

[0064] Table 1

[0065] frequency Temperature at the front end of cooling section ℃ Temperature at the rear end of cooling section ℃ Temperature drop ℃ 1st time 137.5 54.2 83.3 2nd time 138.2 50.1 88.1 3rd 137.4 52.3 85.1 4th 139.4 58.1 81.3 5th 138.2 55.1 83.1

[0066] Example 2

[0067] (1) The fiber fineness of the polylactic acid fiber is 3.5D and the length is 55 mm, and the fiber fineness of the acetate fiber is 3.0D and the length is 60 mm.

[0068] (2) Spinning: Use a small cotton opener to open the two types of fibers twice respectively, and then mix and open them twice, with the licker-in roller rotating at 400 r / min;

[0069] Use AS181A carding machine, cylinder speed 550r / min, doffer speed 9r / min, web speed 5.0r / min, fiber web weight 20g / 0.75m;

[0070] DSDr-01 drawing frame is used, with 3 draws for the first draw, 6 draws for the second draw, and 6 draws for the third draw. The drawing roller gauges are 70mm, 72mm and 80mm respectively. The total drafting speed is 6.00, the drafting multiple of the front zone is 4.35, the drafting multiple of the middle zone is 1.05, the drafting multiple of the back zone is 1.15, the sliver delivery speed is 6.00r / min, and the sliver delivery weight is 22g / 5m;

[0071] The DSRo-01 roving frame was used, with a total drafting speed of 7.35, a roving weight of 6.00 / 10m, a twist coefficient of 80, a spindle speed of 500r / min, and a spindle doffing speed of 400r / min;

[0072] Use DSSp-01 spinning frame, twist coefficient is 60 / 10cm, number is 60tex, wire ring number is 140mg, twist direction is z twist, spindle speed is 8000r / min, sliver speed is 12m / min, yarn hairiness is controlled at 190 / 50m;

[0073] The spinning ratio is 60tex blended yarn with acetate fiber / polylactic acid fiber of 50% / 50% and twist of 40 / 10cm.

[0074] (3) Using a high-speed doubling machine, 10 yarns are doubling into one strand, with a delivery speed of 8 m / min and a tension of 1 tension disk;

[0075] (4) A 16-spindle high-speed braiding machine is used, the number of braided strands is 16, the diameter of a single strand is 1.12 mm, the braiding angle is 60°, the braiding pitch is 10 mm, and the braiding density is 90%, thereby obtaining a cooling belt-shaped fabric.

[0076] The cooling performance of the cooling belt fabric of Example 1 was tested, and the test results are shown in Table 1. It can be seen from Table 1 that the acetate fiber / polylactic acid fiber is 50% / 50%, and the cooling belt fabric can effectively reduce the smoke temperature by 85°C-95°C, and the cooling range is large and stable, and it still has a certain cooling effect after multiple puffs.

[0077] The specific method of cooling performance test is: use common cigarettes, air heater, air pump, flow meter, temperature sensor and other equipment to build it by yourself, which will not be elaborated here.

[0078] Table 2

[0079] frequency Temperature at the front end of cooling section ℃ Temperature at the rear end of cooling section ℃ Temperature drop ℃ 1st time 138.5 46.2 92.3 2nd time 139.5 45.1 94.4 3rd 137.7 45.5 92.2 4th 139.4 47.3 92.1 5th 138.4 46.9 91.5

[0080] Example 3

[0081] (1) The fiber fineness of the polylactic acid fiber is 3.0D and the length is 60mm, and the fiber fineness of the acetate fiber is 3.0D and the length is 60mm.

[0082] (2) Spinning: Use a small cotton opener to open the two types of fibers twice respectively, and then mix and open them twice, with the licker-in speed at 420 r / min;

[0083] AS181A carding machine was used, with cylinder speed of 500r / min, doffer speed of 9r / min, web speed of 5.2r / min, and web weight of 21g / 0.75m;

[0084] DSDr-01 drawing frame is used, with 3 draws for the first draw, 6 draws for the second draw, and 6 draws for the third draw. The drawing roller gauges are 71mm, 72mm and 82mm respectively. The total drafting speed is 5.95, the drafting multiple of the front zone is 4.33, the drafting multiple of the middle zone is 1.03, the drafting multiple of the back zone is 1.13, the sliver delivery speed is 5.90r / min, and the sliver delivery weight is 21g / 5m;

[0085] The DSRo-01 roving frame was used, with a total drafting speed of 6.36, a roving weight of 6.60 / 10m, a twist coefficient of 80, a spindle speed of 500r / min, and a spindle doffing speed of 400r / min;

[0086] Use DSSp-01 spinning frame, twist coefficient is 55 / 10cm, number is 60tex, wire ring number is 140mg, twist direction is z twist, spindle speed is 8000r / min, sliver speed is 12m / min, yarn hairiness is controlled at 200 yarns / 50m;

[0087] The spinning ratio is 60tex blended yarn with acetate fiber / polylactic acid fiber of 75% / 25% and twist of 40 / 10cm.

[0088] (3) Using a high-speed doubling machine, 10 yarns are doubling into one strand, with a delivery speed of 8 m / min and a tension of 1 tension disk;

[0089] (4) A 16-spindle high-speed braiding machine is used, the number of braided strands is 16, the diameter of a single strand is 1.11 mm, the braiding angle is 54°, the braiding pitch is 12 mm, and the braiding density is 88% to obtain a cooling belt-shaped fabric.

[0090] The cooling performance of the cooling belt fabric of Example 2 was tested, and the test results are shown in Table 2. It can be seen from Table 2 that when the acetate fiber / polylactic acid fiber is 75% / 25%, the cooling belt fabric can effectively reduce the flue gas temperature by 80°C-90°C, which is higher than the acetate fiber ratio of 50%. The proportion of the two fibers can be changed according to the actual cooling needs.

[0091] Table 3

[0092] frequency Filter rod front end temperature ℃ Filter rod rear end temperature ℃ Temperature drop ℃ 1st time 133.1 41.9 91.2 2nd time 136.2 39.9 96.3 3rd 135.9 40.1 95.8 4th 134.2 39.3 94.9 5th 137.1 40.4 96.7

[0093] Example 4

[0094] (1) Select the fiber fineness of polylactic acid fiber to be 3.0D and the length to be 60mm, and the fiber fineness of acetate fiber to be 3.0D and the length to be 60mm;

[0095] (2) Spinning: Use a small cotton opener to open the two types of fibers twice respectively, and then mix and open them twice, with the licker-in speed at 420 r / min;

[0096] AS181A carding machine was used, with cylinder speed of 500r / min, doffer speed of 9r / min, web speed of 5.2r / min, and web weight of 21g / 0.75m;

[0097] The DSDr-01 drawing frame is used, with 3 draws for the first draw, 6 draws for the second draw, and 6 draws for the third draw. The drawing roller gauges are 71mm, 72mm, and 82mm respectively. The total drafting speed is 6.00, the drafting multiple of the front zone is 4.33, the drafting multiple of the middle zone is 1.03, the drafting multiple of the back zone is 1.13, the sliver delivery speed is 6.00r / min, and the sliver delivery weight is 22g / 5m;

[0098] The DSRo-01 roving frame was used, with a total drafting speed of 6.36, a roving weight of 6.60 / 10m, a twist coefficient of 80, a spindle speed of 500r / min, and a spindle doffing speed of 400r / min;

[0099] Use DSSp-01 spinning frame, twist coefficient is 55 / 10cm, number is 24tex, wire ring number is 60mg, twist direction is z twist, spindle speed is 8000r / min, sliver speed is 12m / min, yarn hairiness is controlled at 200 yarns / 50m;

[0100] Spinning ratio is 75% / 25% of acetate fiber / polylactic acid fiber, 24 tex blended yarn with a twist of 40 / 10cm, and 24 tex pure polylactic acid fiber yarn and pure acetate fiber yarn with a twist of 40 / 10cm;

[0101] (3) Using a chenille spinning machine, the surface core yarn is made of 24 tex pure polylactic acid fiber yarn, the bottom core yarn is made of 75% / 25% acetate fiber / polylactic acid fiber blended yarn, and the wool yarn is made of 24 tex pure acetate fiber yarn; the width of the gauge is adjusted to control the length of the wool to 2-4 mm; 72 tex chenille yarn is prepared, and the yarn hairiness is controlled at 85,000 yarns / 50 m;

[0102] (4) Using a high-speed doubling machine, 8 yarns are doubling into one strand, with a delivery speed of 8 m / min and a tension of 2 tension discs;

[0103] (5) A 16-spindle high-speed braiding machine is used, the number of braided strands is 16, the diameter of a single strand is 1.11 mm, the braiding angle is 64°, the braiding pitch is 16 mm, and the braiding density is 90% to obtain a cooling belt-shaped fabric.

[0104] The cooling performance of the cooling belt fabric of Example 2 was tested, and the test results are shown in Table 3. It can be seen from Table 3 that the cooling range when using chenille yarn is equivalent to that when using ring yarn, and the preparation process of chenille yarn can be changed according to the actual cooling needs.

[0105] Table 4

[0106] frequency Filter rod front end temperature ℃ Filter rod rear end temperature ℃ Temperature drop ℃ 1st time 134.9 40.5 94.4 2nd time 137.6 39.9 97.7 3rd 139.8 43.1 96.7 4th 138.2 41.3 96.9 5th 135.3 40.7 94.6

[0107] Example 5

[0108] (1) The fiber fineness of the polylactic acid fiber is 3.5D and the length is 55 mm, and the fiber fineness of the acetate fiber is 3.0D and the length is 60 mm.

[0109] (2) Spinning: Use a small cotton opener to open the two types of fibers twice respectively, and then mix and open them twice, with the licker-in roller rotating at 400 r / min;

[0110] Use AS181A carding machine, cylinder speed 550r / min, doffer speed 9r / min, web speed 5.0r / min, fiber web weight 25g / 0.75m;

[0111] DSDr-01 drawing frame is used, with 3 draws for the first draw, 6 draws for the second draw, and 6 draws for the third draw. The drawing roller gauges are 70mm, 72mm and 80mm respectively. The total drafting speed is 6.00, the drafting multiple of the front zone is 4.52, the drafting multiple of the middle zone is 1.12, the drafting multiple of the back zone is 1.15, the sliver delivery speed is 6.00r / min, and the sliver delivery weight is 24g / 5m;

[0112] The DSRo-01 roving frame was used, with a total drafting speed of 7.67, a roving weight of 8.00 / 10m, a twist coefficient of 80, a spindle speed of 500r / min, and a spindle doffing speed of 400r / min;

[0113] Use DSSp-01 spinning frame, twist coefficient is 60 / 10cm, number is 100tex, wire ring number is 220mg, twist direction is z twist, spindle speed is 8000r / min, sliver speed is 12m / min, yarn hairiness is controlled at 180 / 50m;

[0114] The spinning ratio is 100tex blended yarn with acetate fiber / polylactic acid fiber of 50% / 50% and twist of 40 / 10cm.

[0115] (3) Use a high-speed doubling machine to doubling 6 yarns into one strand, with a delivery speed of 10 m / min and a tension of 2 tension discs;

[0116] (4) A 16-spindle high-speed braiding machine is used, the number of braided strands is 16, the diameter of a single strand is 1.12 mm, the braiding angle is 60°, the braiding pitch is 10 mm, and the braiding density is 92%, thereby obtaining a cooling belt-shaped fabric.

[0117] The cooling performance of the cooling belt fabric of Example 1 was tested, and the test results are shown in Table 1. It can be seen from Table 1 that the acetate fiber / polylactic acid fiber is 50% / 50%, and the cooling belt fabric can effectively reduce the smoke temperature by 85°C-90°C, and the cooling range is large and stable, and it still has a certain cooling effect after multiple puffs.

[0118] The specific method of cooling performance test is: use common cigarettes, air heater, air pump, flow meter, temperature sensor and other equipment to build it by yourself, which will not be elaborated here.

[0119] Table 5

[0120] frequency Temperature at the front end of cooling section ℃ Temperature at the rear end of cooling section ℃ Temperature drop ℃ 1st time 138.3 48.8 89.5 2nd time 138.8 49.1 89.7 3rd 137.9 50.1 88.2 4th 138.1 49.9 88.2 5th 138.9 51.1 87.8

[0121] The above related explanations and descriptions of the embodiments are for the convenience of those skilled in the art to understand and apply the present invention. It is obvious that those familiar with the art can easily make various modifications to these contents and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above related explanations and descriptions of the embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A cooling filter rod, comprising a cooling belt-shaped fabric, the cooling belt-shaped fabric is a structure woven by yarns, used in a non-combustion cigarette filter, characterized in that: The yarn weaving structure includes a ply yarn formed by plying fancy yarns and a structure woven from ply yarns, the yarn surface is covered with hairiness, the hairiness and the yarn weaving structure form longitudinal and transverse channels to extend the time for smoke to pass through, wherein the hairiness is distributed in the longitudinal and transverse channels; The preparation method of the cooling belt-shaped fabric includes spinning and weaving. During spinning, the control of the yarn hairiness is reduced to achieve hairiness on the surface. During weaving, different numbers of yarns are determined according to different yarns and weaving machines. First, 3-18 yarns are combined by a doubling machine, and then 8-32 strands are braided to achieve the required diameter. (1) Opening: Open acetate fiber and polylactic acid fiber 1-2 times respectively, then mix and open 2-3 times, the opening time is 2-3 minutes, and the licker-in speed is 350-550r / min; (2) Combing; The fibers after opening are humidified 12-24 hours in advance, and the combing times are 2-3 times. During the combing process, the cylinder speed is 500-620r / min, the doffer speed is 8-10r / min, the web speed is 4.5-5.5r / min, and the fiber web weight is 18-24g / 0.75m; (3) Drawing: The first drawing process uses 3-4 strands, the second and third drawing processes use 5-6 strands, the three roller gauges are 72-74mm, 70-72mm and 80-82mm respectively, the total drafting speed is 5.50-6.00, the drafting ratio of the front zone is 4.35-4.65, the drafting ratio of the middle zone is 1.00-1.05, the drafting ratio of the rear zone is 1.10-1.15, the sliver delivery speed is 5.50-6.00r / min, and the sliver delivery weight is 18-24g / 5m; (4) Roving: total drafting speed is 5.50-7.50, roving weight is 6.00-7.00g / 10m, twist coefficient is 80-85, spindle speed is 440r / min-550r / min, spindle doffing speed is 340r / min-440r / min; (5) Spun yarn: twist coefficient is 15-80 / 10cm, number is 20-100tex, wire ring number is 100-240mg, twist direction is S twist or Z twist, spindle speed is 8000-10000r / min, sliver speed is 10-16m / min, yarn hairiness is controlled at 100-300 yarns / 50m, and the spinning method is ring spinning.

2. The cooling filter rod according to claim 1, characterized in that: The yarn comprises acetate fiber and polylactic acid fiber.

3. The cooling filter rod according to claim 1, characterized in that: The fancy yarns include ring yarn, chenille yarn, slub yarn and loop yarn.

4. The cooling filter rod according to claim 1, characterized in that: The fineness of the yarn is 20tex-100tex, and the twist of the yarn is 15-80 / 10cm.

5. The cooling filter rod according to claim 2, characterized in that: The acetate fiber accounts for 20%-80% of the yarn, and the polylactic acid fiber accounts for 80%-20%.

6. The cooling filter rod according to claim 2, characterized in that: The acetate fiber has a fineness of 1.5-8.0D and a length of 30-70mm, and the polylactic acid fiber has a fineness of 1.5-8.0D and a length of 30-70mm.

7. The cooling filter rod according to claim 1, characterized in that: The cooling belt-shaped fabric has a diameter of 5 mm to 8 mm, a gram weight of 0.90 to 1.50 g / 10 cm, a weaving density of 75% to 95%, a weaving angle of 60° to 85°, and a weaving intercept of 5 mm to 30 mm.

8. Use of the cooling filter rod according to any one of claims 1 to 7 in a non-combustion cigarette filter.

9. The use according to claim 8, characterized in that: The cooling belt-shaped fabric is wrapped with wrapping paper to stabilize its shape.

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