CN114601190B - Method for regulating and controlling drying moisture of slice threads - Google Patents
Method for regulating and controlling drying moisture of slice threads Download PDFInfo
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- CN114601190B CN114601190B CN202210276625.5A CN202210276625A CN114601190B CN 114601190 B CN114601190 B CN 114601190B CN 202210276625 A CN202210276625 A CN 202210276625A CN 114601190 B CN114601190 B CN 114601190B
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Abstract
The invention provides a method for regulating and controlling the drying moisture of thin slices, wherein a first moisture meter collects the feeding moisture of the thin slices of a leaf-shred damping machine and transmits the collected data to an atomization water-adding control module; the atomized water adding control module adjusts the water adding flow of the cut tobacco conditioning machine to be 60kg/h-200kg/h, and changes the water adding flow into a stable control program of PID (proportion integration differentiation) outlet water feedback control of the cut tobacco conditioning machine after the water adding flow lasts for 10s-60s; the second moisture meter collects the moisture of the thin slice filament feeding of the air flow filament dryer and transmits the collected data to the air flow drying strength control module; the airflow drying strength control module reduces the temperature and the air quantity of hot air, reduces the frequency of a moisture exhaust fan and reduces the heat value of the airflow cut tobacco dryer. The invention adopts the methods of water feedforward and low-temperature processing control, greatly reduces the proportion of the dry materials of the stub bar of the slice thread, reduces the dry materials of the stub bar by nearly 70 percent, improves the processing identity of partial materials of the stub bar and the whole batch, and improves the quality of cigarette products.
Description
Technical Field
The invention relates to the technical field of a tobacco shred making process in tobacco processing, in particular to a method for regulating and controlling the drying moisture of thin slices.
Background
In the tobacco industry, the conventional sheet shreds are independently processed into a new process, and although some conventional water control technologies have a good effect on common tobacco shreds, the sheet shreds have the characteristic of rapid water absorption and water loss, so that some conventional technologies cannot meet the requirements of the new process when the material characteristics are changed. After the cut tobacco is dried, the cut tobacco with a certain proportion of stub bars has unsatisfactory dry water content, and when the cut tobacco is blended with the cut tobacco, the influence on the product quality of cigarettes, particularly on the smoking taste, is large.
In the prior art, when a deviation between actual moisture and a set value of cut tobacco is detected by a cut tobacco outlet moisture meter, a PID controller corrects a water adding initial value, but for the cut tobacco of a stub bar, because no outlet moisture exists at the beginning, feedback control cannot be carried out, so that serious hysteresis exists, and the moisture content of the cut tobacco of a certain proportion does not meet the requirement.
The existing control parameters and working time of the roller airflow cut-tobacco drier are designed aiming at steady-state materials, the flow of the stub bar materials is small, the existing control parameters can cause the processing strength of equipment to be not matched with the flow of the stub bar, and finally the stub bar materials are excessively dehydrated, so that the problem of pertinently researching the moisture control of the stub bar of the slice shreds on the basis of the original moisture control technology and according to the characteristics of the slice shreds is solved.
SUMMARY OF THE PATENT FOR INVENTION
In order to solve the technical problems, the invention provides a method for regulating and controlling the drying moisture of thin slice threads, which adopts a method of moisture feedforward and low-temperature processing control to strengthen the moisture retention of materials at the initial feeding stage of the thin slice threads and reduce the moisture loss, thereby improving the moisture content of the stub bar of the thin slice threads, reducing the material proportion of the stub bar with lower moisture content of the thin slice threads and improving the processing identity of partial materials of the stub bar and the whole batch.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for regulating and controlling the drying moisture of thin slices adopts a regulating and controlling device for the drying moisture of the thin slices to process, the regulating and controlling device comprises a cut leaf moisture regaining machine and an airflow cut tobacco drying machine, the cut leaf moisture regaining machine is used for heating and humidifying cut leaves, and the airflow cut tobacco drying machine is arranged at the downstream of the cut leaf moisture regaining machine and is used for drying the cut leaves;
a first moisture meter is arranged at the inlet of the cut tobacco conditioning machine and used for collecting the material moisture at the inlet of the cut tobacco conditioning machine;
a second moisture meter is arranged at the inlet of the airflow cut-tobacco drier and used for collecting the material moisture at the inlet of the airflow cut-tobacco drier;
a third moisture meter is arranged at the outlet of the airflow cut tobacco dryer and used for collecting the moisture of the material at the outlet of the airflow cut tobacco dryer;
the cut tobacco conditioning machine is provided with an atomization water adding control module which is used for receiving data collected by the first moisture meter and the second moisture meter and controlling the material moisture in the cut tobacco conditioning machine;
the airflow cut tobacco dryer is provided with an airflow drying strength control module for receiving data acquired by the second moisture meter and the third moisture meter and controlling the drying strength of the material in the airflow cut tobacco dryer;
the method specifically comprises the following steps:
s1: the first moisture meter collects the feed moisture of the thin sheet wires of the leaf wire conditioner and transmits the collected data to the atomization water adding control module;
s2: the atomization water adding control module adjusts the water adding amount of the cut tobacco conditioning machine, and specifically comprises the following steps:
when the first moisture meter detects that the moisture of the material at the inlet of the cut tobacco conditioner is 16-19%, the atomization water adding control module adjusts the water adding flow to be 60-200 kg/h, the delay working time is 10-30 s, and the duration is 10-60 s;
s3: the control program of the atomization water adding control module is converted into a control program of the PID outlet moisture feedback control of the steady-state cut tobacco conditioning machine;
s4: the second moisture meter collects the moisture of the thin slice shred fed by the air flow shred dryer and transmits the collected data to the air flow drying strength control module;
s5: the airflow drying strength control module adjusts the drying strength of the materials in the airflow cut-tobacco drier at the stub bar stage, and specifically comprises the following steps:
and when the second moisture meter detects that the moisture of the material at the inlet of the airflow cut-tobacco drier is 20-24%, reducing the heat value of the airflow cut-tobacco drier.
Further, the method for reducing the heat value of the airflow cut-tobacco drier comprises the following steps:
s51, reducing the heat value of the airflow cut-tobacco drier by using simulated water, and adjusting the flow of the simulated water to be 50kg/h-180kg/h;
s52, the working duration of the simulated water is within 30min, and when the second moisture meter detects that the moisture value of the incoming material reaches 6%, the simulated water stops working;
s53, adjusting the opening degree of a hot air door, reducing the temperature by 5-10 ℃, simultaneously reducing the frequency of a moisture exhaust fan by 5-50%, simultaneously reducing the air quantity by 5-15%, wherein the delay time of the combined action is 5-10S, and the duration time is 10-60S;
and S54, converting the control program of the airflow drying strength control module into a control program of PID (proportion integration differentiation) outlet moisture feedback control of the airflow cut-tobacco drier in a steady state.
Furthermore, the airflow drying strength control module comprises a simulated water control unit, a hot air control unit, a moisture exhaust fan control unit and an air flow control unit, and the simulated water and the hot air flow are respectively controlled and adjusted.
Further, the outlet moisture of the steady-state tobacco shred damping machine PID outlet moisture feedback control is the material moisture collected by the second moisture meter.
Further, the outlet moisture of the steady-state airflow cut-tobacco drier PID outlet moisture feedback control is the material moisture collected by the third moisture meter.
Furthermore, the regulating device also comprises a slice shred cutting machine arranged at the upstream of the cut tobacco conditioning machine and a slice shred storage cabinet arranged at the downstream of the airflow shred drying machine.
Further, the cut tobacco moisture regaining machine is a drum-type cut tobacco moisture regaining machine, and the airflow cut tobacco drying machine is a drum-type airflow cut tobacco drying machine.
Compared with the prior art, the invention has the beneficial effects that:
1. by adopting the methods of water feed forward and low-temperature processing control, the proportion of the slice thread stub bar dry material is greatly reduced, the proportion of the stub bar dry material is reduced by nearly 70 percent, and the processing identity of part of the stub bar material and the whole batch is improved.
2. The quality of cigarette products is improved, and each batch of slice shreds avoids influencing the sensory quality of finished cigarettes through regulating and controlling the moisture of the material at the stub bar of the slice shreds.
Drawings
FIG. 1 is a schematic structural diagram of a device for controlling the drying moisture of thin sheet yarns according to the present invention.
FIG. 2 is a flow chart of the method for controlling the drying moisture of the thin slice threads.
In the figure: 1-leaf shred conditioning machine; 11-an atomized water adding control module; 2-airflow cut tobacco drier; 21-airflow drying strength control module; 211-analog water control unit; 212-a hot air control unit; 213-moisture exhausting fan control unit; 214-air volume control unit; 31-a first moisture meter; 32-a second moisture meter; 33-a third moisture meter; 4-slice and silk cutting machine; 5-thin slice silk storing cabinet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
The invention provides a method for regulating and controlling the drying moisture of slice threads. As shown in fig. 1, the regulating device includes a cut tobacco conditioner 1, an air-flow cut tobacco dryer 2, a cut sheet tobacco machine 4 disposed at the upstream of the cut tobacco conditioner 1, and a cut sheet tobacco storage cabinet 5 disposed at the downstream of the air-flow cut tobacco dryer 2, wherein the cut tobacco conditioner 1 is used for heating and humidifying cut tobacco, and the air-flow cut tobacco dryer 2 is disposed at the downstream of the cut tobacco conditioner 1 and used for drying cut tobacco. Preferably, the cut tobacco conditioner 1 is a roller-type cut tobacco conditioner 1, and the airflow cut tobacco dryer 2 is a roller-type airflow cut tobacco dryer 2. The slice shred cutting machine 4 cuts the slices into slice shreds with the width meeting the technological requirements, and after the slices are shredded, the finished slice shreds are obtained after the procedures of leaf shred dampening, air stream shred drying and the like and are stored in a slice shred storage cabinet 5.
The first moisture meter 31 is arranged at the inlet of the cut tobacco conditioning machine 1 and used for collecting material moisture at the inlet of the cut tobacco conditioning machine 1, so that moisture feedforward control of the cut tobacco conditioning machine 1 is realized, and the material moisture can be detected at the initial feeding stage of thin slices. The second moisture meter 32 is arranged at the inlet of the airflow cut-tobacco drier 2 and is used for collecting the material moisture at the inlet of the airflow cut-tobacco drier 2 and the material moisture at the outlet of the cut-tobacco conditioner 1. And a third moisture meter 33 is arranged at the outlet of the airflow cut-tobacco drier 2 and is used for collecting the moisture of the material at the outlet of the airflow cut-tobacco drier 2 and determining whether the material dried by the airflow cut-tobacco drier 2 is dry material. The cut tobacco resurfacing machine 1 is provided with an atomization water adding control module 11 for receiving data collected by a first moisture meter 31 and a second moisture meter 32 and controlling the material moisture in the cut tobacco resurfacing machine 1, so that the material meets the process requirement of the expansion function of cut tobacco drying equipment. The airflow cut-tobacco drier 2 is provided with an airflow drying strength control module 21 for receiving data collected by the second moisture meter 32 and controlling the drying strength of the materials in the airflow cut-tobacco drier 2.
The method for regulating and controlling the drying moisture of the thin slices specifically comprises the following steps:
s1: the first moisture meter 31 collects the feed moisture of the thin sheet wires of the leaf wire conditioning machine 1 and transmits the collected data to the atomization water adding control module 11;
s2: the atomization water adding control module 11 adjusts the water adding amount of the cut tobacco conditioning machine 1, and specifically comprises the following steps:
when the first moisture meter 31 detects that the moisture content of the material at the inlet of the cut tobacco conditioner 1 is 16% -19%, the atomization water adding control module 11 adjusts the water adding flow to be 60kg/h-200kg/h, the delay working time is 10s-30s, and the duration is 10s-60s;
s3: the control program of the atomized water adding control module 11 is converted into a control program of the PID outlet water feedback control of the steady-state cut tobacco conditioning machine;
s4: the second moisture meter 32 collects the moisture of the thin sheet wire fed by the airflow cut-tobacco drier 2 and transmits the collected data to the airflow drying strength control module 21;
s5: the airflow drying strength control module 21 adjusts the drying strength of the material in the airflow cut-tobacco drier 2 at the stub bar stage, and specifically comprises the following steps:
when the second moisture meter 32 detects that the moisture of the material at the inlet of the airflow cut-tobacco drier 2 is 20-24%, the heat value of the airflow cut-tobacco drier 2 is reduced.
Referring to fig. 1 and 2, the thin slice filament cutting machine 4 cuts the thin slice filaments into thin slice filaments with the width meeting the process requirement and then sends the thin slice filaments to the cut leaf filament conditioning machine 1, a first moisture meter 31 is arranged at the inlet of the cut leaf filament conditioning machine 1, and when the material is sent to the position of the first moisture meter 31, the first moisture meter 31 detects the moisture of the material, which indicates that the material starts to be fed. Under the condition of stable material flow, the moisture of the material at the inlet of the cut tobacco conditioning machine 1 is generally above 19%, and the moisture of the material head is generally in the interval of 16-19%. Therefore, when the first moisture meter 31 detects that the moisture content of the material at the inlet of the cut tobacco conditioning machine 1 is 16% -19%, the acquired data are sent to the atomization water adding control module 11, after the delay of 10s-30s, the atomization water adding control module 11 adjusts the water adding flow to be 60kg/h-200kg/h and the duration to be 10s-60s, and then the control is converted into the PID outlet moisture feedback control of the steady-state cut tobacco conditioning machine. Because the first moisture meter 31 is a certain distance away from the cut tobacco conditioning machine 1, a period of time is needed from the detection point to the processing point, when the first moisture meter 31 detects that the moisture of the material is 16% -19%, the atomization water adding control module 11 does not need to respond immediately, and works after the time delay is 10-30 s. When the stub bar part of the material passes through the cut tobacco conditioner 1, the material flow reaches a stable state, and then the steady state is converted to the PID outlet moisture feedback control of the cut tobacco conditioner, the atomization water adding control module 11 receives the data collected by the second moisture meter 32, and the PID controller of the cut tobacco conditioner 1 controls the material moisture in the cut tobacco conditioner 1 according to the material moisture collected by the second moisture meter 32.
The thin slices are heated and humidified in the leaf shred damping machine 1, and then are conveyed to the air flow shred drying machine 2 for drying. When the second moisture meter 32 at the inlet of the airflow cut-tobacco drier 2 detects that the moisture of the material at the inlet of the airflow cut-tobacco drier 2 is 20% -24%, the airflow drying strength control module 21 reduces the heat value of the airflow cut-tobacco drier 2 according to the moisture value collected by the second moisture meter 32. Specifically, the method for reducing the heat value of the airflow cut-tobacco drier 2 comprises the following steps:
s51, reducing the heat value of the airflow cut-tobacco drier 2 by using simulated water, and adjusting the simulated water flow to be 50kg/h-180kg/h;
s52, the working duration of the simulated water is within 30min, and when the second moisture meter 32 detects that the moisture value of the incoming material reaches 6%, the simulated water stops working;
s53, adjusting the opening degree of a hot air door, reducing the temperature by 5-10 ℃, simultaneously reducing the frequency of a moisture exhaust fan by 5-50%, simultaneously reducing the air quantity by 5-15%, wherein the delay time of the combined action is 5-10S, and the duration time is 10-60S;
and S54, converting the control program of the airflow drying strength control module 21 into a control program of PID (proportion integration differentiation) outlet moisture feedback control of the airflow cut-tobacco drier in a steady state.
The airflow drying strength control module 21 includes a simulated water control unit 211, a hot air control unit 212, a moisture exhaust fan control unit 213, and an air volume control unit 214, which respectively control and adjust the simulated water and the hot air flow. When materials exist in the airflow cut-tobacco drier 2, the simulated water cannot be used in the process, so the simulated water is generally matched with hot air for use under the condition that equipment is standby or batch equipment does not have the materials. Because the air flow drying strength control module 21 needs to perform a series of work when being stopped and started, which consumes more time and affects the production progress, generally, under the conditions that the equipment is standby for a short time and no material exists in batches, the air flow drying strength control module 21 can be continuously in a working state.
Before the materials enter the airflow cut-tobacco drier 2, the simulated water control unit 211 works within 30min, the simulated water is used for reducing the heat value of the roller airflow cut-tobacco drier 2 or keeping the heat value of the roller airflow cut-tobacco drier 2 relatively low, and the simulated water flow is 50kg/h-180kg/h. When the second moisture meter 32 detects that the moisture value of the incoming material reaches 6%, it indicates that the material starts to enter the airflow cut-tobacco drier 2, the use of the simulated water is stopped, the processing strength of the equipment is reduced, and the low-temperature processing control is performed. The hot air control unit 212 adjusts the opening degree of a hot air damper and reduces the temperature of hot air for drying materials by 5-10 ℃; meanwhile, the moisture exhaust fan control unit 213 reduces the frequency of the moisture exhaust fan by 5% -50%; the air volume control unit 214 also simultaneously reduces the hot air volume by 5-15%. The time delay of the combined action of the hot air control unit 212, the moisture exhaust fan control unit 213 and the air control unit 214 is 5s-10s, the duration is 10s-60s, and then the control is converted into the PID outlet moisture feedback control of the steady airflow cut-tobacco drier. At this time, the material at the head of the material passes through the airflow cut-tobacco drier 2, the material flow rate reaches a stable state, and the PID controller of the airflow cut-tobacco drier 2 controls the material processing strength in the airflow cut-tobacco drier 2 according to the material moisture collected by the third moisture meter 33.
The weight of three batches of the dry material of the chip scrap processed according to the above method was counted and compared with the weight of three batches of the dry material of the chip scrap not processed according to the above method, and the results are shown in table 1:
TABLE 1 comparison table of the weight of dry material processed by the method for controlling the moisture content of the sheet yarn of the present invention and the method for controlling the moisture content of the sheet yarn of the present invention
In table 1, the weight of the dry material is the weight of the dry material measured according to the cigarette technical code. According to the requirements of the cigarette technical specification, the material with the moisture content smaller than the standard moisture content (the set value of moisture) by more than 2.5 percent is called as the dry material after the thin slices are dried by the airflow cut-tobacco drier 2. For example, a moisture set value of 10% is 2.5% less than 10%, i.e., a material with a moisture content of less than 7.5% is a "dry material".
As shown in Table 1, after the method for regulating and controlling the drying moisture of the thin slice threads is adopted, the weight of dry materials of the stub bar of the thin slice threads is greatly reduced, and the quality of the materials is effectively improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for regulating and controlling the drying moisture of thin slices is characterized in that a regulating and controlling device for the drying moisture of the thin slices is adopted for processing, the regulating and controlling device comprises a cut leaf moisture regaining machine and an airflow cut tobacco drying machine, the cut leaf moisture regaining machine is used for heating and humidifying cut leaves, and the airflow cut tobacco drying machine is arranged at the downstream of the cut leaf moisture regaining machine and is used for drying the cut leaves;
a first moisture meter is arranged at the inlet of the cut tobacco conditioner and used for collecting the moisture of the material at the inlet of the cut tobacco conditioner;
a second moisture meter is arranged at the inlet of the airflow cut-tobacco drier and used for collecting the material moisture at the inlet of the airflow cut-tobacco drier;
a third moisture meter is arranged at the outlet of the airflow cut-tobacco drier and used for collecting the material moisture at the outlet of the airflow cut-tobacco drier;
the cut tobacco conditioning machine is provided with an atomization water adding control module for receiving data collected by the first moisture meter and the second moisture meter;
the airflow cut-tobacco drier is provided with an airflow drying strength control module for receiving data collected by the second moisture meter and the third moisture meter;
the method specifically comprises the following steps:
s1: the first moisture meter collects the feed moisture of the thin sheet wires of the leaf wire conditioner and transmits the collected data to the atomization water adding control module;
s2: the atomization water adding control module adjusts the water adding amount of the cut tobacco conditioning machine, and specifically comprises the following steps:
when the first moisture meter detects that the moisture of the material at the inlet of the cut tobacco conditioning machine is 16-19%, the atomization water adding control module adjusts the water adding flow to be 60-200 kg/h, the delay working time is 10-30 s, and the duration time is 10-60 s;
s3: the control program of the atomization water adding control module is converted into a control program of the PID outlet moisture feedback control of the steady-state cut tobacco conditioning machine;
s4: the second moisture meter collects the moisture of the thin slice filament feeding of the air flow filament dryer and transmits the collected data to the air flow drying strength control module;
s5: the airflow drying strength control module adjusts the drying strength of the materials in the airflow cut-tobacco drier at the stub bar stage, and specifically comprises the following steps:
when the second moisture meter detects that the moisture of the material at the inlet of the airflow cut-tobacco drier is 20-24%, reducing the heat value of the airflow cut-tobacco drier; a method of reducing the heating value of an air-flow cut-tobacco dryer comprising the steps of:
s51, reducing the heat value of the airflow cut-tobacco drier by using simulated water, and adjusting the flow of the simulated water to be 50kg/h-180kg/h;
s52, the working duration of the simulated water is within 30min, and when the second moisture meter detects that the moisture value of the incoming material reaches 6%, the simulated water stops working;
s53, adjusting the opening degree of a hot air door, reducing the temperature by 5-10 ℃, simultaneously reducing the frequency of a moisture exhaust fan by 5-50%, simultaneously reducing the air quantity by 5-15%, wherein the delay time of the combined action is 5-10S, and the duration time is 10-60S;
and S6, converting the control program of the airflow drying strength control module into a control program of PID (proportion integration differentiation) outlet moisture feedback control of the airflow cut-tobacco drier in a steady state.
2. The method for regulating and controlling the drying moisture of the thin-sheet threads according to claim 1, wherein the airflow drying strength control module comprises a simulated water control unit, a hot air control unit, a moisture exhaust fan control unit and an air volume control unit, and the simulated water and the hot air flow are respectively controlled and adjusted.
3. The method for controlling the dry moisture of the thin threads according to claim 1, wherein the outlet moisture of the PID outlet moisture feedback control of the steady-state cut tobacco conditioner is the material moisture collected by the second moisture meter.
4. The method for controlling the dry moisture of the thin-sheet threads according to claim 1, wherein the outlet moisture of the PID outlet moisture feedback control of the steady-state air-flow thread drying machine is the material moisture collected by a third moisture meter.
5. The method of conditioning thin-sheet silk dry moisture according to claim 1, wherein the conditioning device further comprises a thin-sheet silk cutting machine disposed upstream of the leaf-silk conditioning machine and a thin-sheet silk storage cabinet disposed downstream of the air-flow cut-sheet silk drying machine.
6. The method of controlling dry moisture content of thin sheet threads according to claim 1, wherein the leaf thread conditioner is a drum-type leaf thread conditioner, and the air-jet cut-thread dryer is a drum-type air-jet cut-thread dryer.
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ZA756260B (en) * | 1975-10-02 | 1977-05-25 | Tobacco Res & Dev | Drying method and apparatus |
CN103202528B (en) * | 2013-04-10 | 2015-05-20 | 湖南中烟工业有限责任公司 | Cut lamina drying control method and cut lamina drying system based on feedforward and feedback of HT moisture compensation |
CN204191559U (en) * | 2014-10-22 | 2015-03-11 | 浙江中烟工业有限责任公司 | A kind of finished product cut tobacco production system adopting SH93 air flow type cut tobacco drier |
CN104432456A (en) * | 2014-10-30 | 2015-03-25 | 陕西中烟工业有限责任公司 | High-yield cut tobacco drying method |
CN106036975B (en) * | 2016-06-29 | 2018-05-22 | 河南中烟工业有限责任公司 | A kind of stable method for drying silk moisture |
CN205962799U (en) * | 2016-06-29 | 2017-02-22 | 河南中烟工业有限责任公司 | A stable moisture device that dries by fire |
CN108236125B (en) * | 2016-12-23 | 2021-03-26 | 红塔烟草(集团)有限责任公司 | Cut tobacco drying method for reducing dry head and dry tail of cut tobacco dried by EVA airflow |
CN112021641B (en) * | 2020-07-10 | 2022-04-29 | 张家口卷烟厂有限责任公司 | On-line moisture meter calibration system for tobacco shred making link |
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