CN112890265B - Device and method for controlling physical index of dip-coating type coating liquid of reconstituted tobacco by papermaking method - Google Patents
Device and method for controlling physical index of dip-coating type coating liquid of reconstituted tobacco by papermaking method Download PDFInfo
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- CN112890265B CN112890265B CN202110348610.0A CN202110348610A CN112890265B CN 112890265 B CN112890265 B CN 112890265B CN 202110348610 A CN202110348610 A CN 202110348610A CN 112890265 B CN112890265 B CN 112890265B
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products
Abstract
The invention provides a physical index control device for dip-coating type coating liquid of reconstituted tobacco by a papermaking method; the concentration and viscosity stability of coating liquid at the inlet of the coating machine can be ensured, the coating liquid quantity on the dip coating machine is large, the substrate passes through the coating liquid, part of paper wool is migrated from the substrate to the coating liquid in the process, and when paper breakage occurs in a production line, part of damaged substrate enters the coating liquid to cause the increase of the concentration and viscosity of the coating liquid. The invention also provides a physical index control method for realizing dip-coating type coating liquid of reconstituted tobacco by using the device, which ensures that the coating liquid entering the whole paper web range uniformly enters the coating machine in an overflow mode, and avoids the conditions of larger flow at the near-pump end and small flow even near zero flow at the reflux section of the far-pump of the pipeline which are commonly caused by the existing feeding system. The full flow and the reflux of the coating liquid in the coating machine are guaranteed to the greatest extent, so that the stability of the physical index of the coating liquid on the coating machine is realized.
Description
Technical Field
The invention belongs to the technical field of paper-making reconstituted tobacco, and particularly relates to a physical index control device for dip-coating liquid of paper-making reconstituted tobacco.
The invention also relates to a physical index control method for the dip-coating type coating liquid of the reconstituted tobacco by the papermaking method.
Background
In the production of reconstituted tobacco by a paper-making method, tobacco stems, tobacco dust and the like generated in the processes of threshing, redrying, cigarette production and the like are taken as raw materials, the raw materials are soaked, a tobacco extract is obtained through solid-liquid separation, the liquid phase is subjected to multi-layer purification and concentration, essence and spice are prepared to finally form a coating liquid, and a coating system continuously passes through a coating liquid trough in a coating machine through a sheet base formed by paper making, and the coating liquid quantitatively enters the sheet base to finish coating. The coating process is a continuous production process, the substrate continuously passes through a trough of a coating system, and fine fibers on the substrate are separated from the coating liquid, so that the viscosity of the coating liquid is continuously increased and the concentration is changed, and the coating rate is fluctuated.
However, the following problems exist in the prior art: 1. the method comprises the steps that the flowing back coating liquid on a coating machine, the feeding flow of a coating liquid blending tank is unstable, new and old coating liquid is mixed in a coating liquid on-site tank, and a horizontal screw machine is connected outside the on-site tank for purification treatment, so that physical indexes such as the concentration, viscosity and the like of the coating liquid in the coating liquid on-site tank have larger fluctuation; 2. the treated recovered coating liquid directly enters a coating liquid in-situ tank, the use ratio of the recovered liquid and the new coating liquid in the specific use process cannot be ensured, the physical index stability of the coating liquid is mainly the physical index of the coating liquid on a coating machine, the coating liquid amount on the coating machine in the dip-coating process is large, and the control method for the liquid is not explicitly described in the invention.
Disclosure of Invention
The invention aims to solve the technical problem of providing a physical index control device for dip-coating type coating liquid for reconstituted tobacco by a paper-making process, which has a reasonable structure and is used for controlling physical indexes of the coating liquid on line.
The invention also aims to provide a physical index control method for dip-coating type coating liquid of paper-making reconstituted tobacco.
In order to solve the technical problems, the invention provides a physical index control device for dip-coating type coating liquid of reconstituted tobacco by a papermaking method;
comprises a coating mechanism and a recovery mechanism;
the coating mechanism comprises a tank bottom screw pump, a coating liquid on-site tank, a recovery tank, at least one feeding tank and two coating rollers, wherein the inlet of the coating liquid on-site tank is communicated with a coating liquid source, the outlet of the coating liquid on-site tank is communicated with the inlet of the tank bottom screw pump, and the outlet of the tank bottom screw pump is connected with the inlet of the feeding tank through a transfusion pipeline;
the recovery mechanism comprises a three-way stop valve, a rectangular sieve, a viscometer, a coating liquid recovery tank, a discharge screw pump, a first flowmeter, a second flowmeter and a first concentration meter;
the inlet of the three-way stop valve is communicated with the outlet of the recovery tank of the coating mechanism, the first outlet of the three-way stop valve is communicated with the coating liquid on-site tank, the second outlet of the three-way stop valve is connected with the inlet of the rectangular sieve, the outlet of the rectangular sieve is communicated with the inlet of the coating liquid recovery tank through the viscometer, the outlet of the coating liquid recovery tank is communicated with the inlet of the discharging screw pump through the adjusting pipeline, the outlet of the discharging screw pump is communicated with the clean water source through the adjusting pipeline, the adjusting pipeline is provided with the adjustable throttle valve and the second flowmeter, the outlet of the discharging screw pump is communicated with the inlet of the coating liquid recovery tank through the reflux pipeline, the reflux pipeline is provided with the second stop valve and the first concentration meter, and the outlet of the discharging screw pump is communicated with the infusion pipeline of the coating mechanism through the mixing pipeline, and the mixing pipeline is provided with the first stop valve and the first flowmeter.
And a second concentration meter is also arranged on the infusion pipeline.
As the optimization of the physical index control device for the dip-coating liquid of the reconstituted tobacco by the paper-making method, a third stop valve is further arranged on a pipeline between the viscometer and the inlet of the coating liquid recovery tank in the recovery mechanism, the pipeline between the viscometer and the third stop valve is communicated with the outside through a cleaning pipeline, and a fourth stop valve is arranged on the cleaning pipeline.
As the optimization of this paper-making process reconstituted tobacco dip-coating formula coating liquid physical index controlling means, coating mechanism still includes the dip-coating storehouse, the feed chute sets up in dip-coating storehouse upside, dip-coating storehouse side wall has an opening, two coating rollers are installed in the opening part of dip-coating storehouse, the edge of dip-coating storehouse opening part seals between two coating rollers, the clearance between two coating rollers has only to supply the tobacco substrate to pass through, the coating liquid level in the dip-coating storehouse is higher than the clearance position between two coating rollers, the recovery tank communicates with each other with the dip-coating storehouse bottom.
As the optimization of the physical index control device for the dip-coating type coating liquid of the reconstituted tobacco by the papermaking method, the coating mechanism comprises two feed tanks, wherein the two feed tanks are positioned on the upper side of the dip-coating bin, the trend of the feed tanks is consistent with the axial direction of the coating roller, the inlet of the feed tank is positioned at the bottom, and the upper end face of the feed tank is opened.
After the structure is adopted, coating liquid enters the tank body from the bottoms of the two feed tanks, the feed tanks adopt overflow feed design, and the two feed tanks are different in opening height, so that the coating liquid overflows from only one required end to enter the coating machine; the reflux tank is arranged at the lower part of the dip-coating bin, so that the coating liquid on the coating machine is guaranteed to reflux to the coating liquid recovery tank;
the physical index control device for dip-coating type coating liquid of reconstituted tobacco by the papermaking method ensures that the coating liquid enters the coating mechanism uniformly in the whole paper web range in an overflow mode, avoids the conditions that the flow of the near pump end of a pipeline is large, the flow of the reflux section of a remote pump is small and even is close to zero, which are commonly caused by the existing feeding system, and controls the liquid level on the coating mechanism and ensures the reflux of the coating liquid in a mode of an overflow port on the existing coating mechanism.
In order to solve the technical problems, the invention provides a method for realizing physical index control of dip-coating type coating liquid of reconstituted tobacco by a papermaking method by using the physical index control device of dip-coating type coating liquid of reconstituted tobacco by a papermaking method, which comprises the following steps:
a) The newly prepared coating liquid enters a coating liquid on-site tank through a feed pipe, the concentration and viscosity of the newly prepared coating liquid are stably controlled in the former working section, and the incoming material concentration of the new coating liquid concentration is as follows: 42% ± 0.5%;
b) The new coating liquid in the coating liquid in-situ tank is pumped out by a tank bottom screw pump and enters a coating mechanism of a physical index control device of the coating liquid for dip-coating the reconstituted tobacco by the papermaking method through a second concentration meter;
c) The coating liquid becomes recovery liquid after finishing the coating operation of the tobacco substrates, the recovery liquid is intensively discharged by a recovery tank of the coating mechanism, and the recovery liquid flows back to the rectangular screen for purification treatment through a three-way stop valve (in special cases, for example, when the coating liquid in the coating mechanism is in a debugging stage or is not used, the coating liquid in the coating mechanism is directly returned to a coating liquid in-situ tank);
the method comprises the steps that a rectangular screen purifies a recovery liquid, a viscosity meter detects the viscosity of the recovery liquid after the rectangular screen is processed, the recovery liquid is discharged into a recovery tank when the viscosity of the recovery liquid is less than 75cp, the recovery liquid enters a coating liquid recovery tank when the viscosity of the recovery liquid is within a range, and the recovery liquid is directly discharged and subjected to an automatic rectangular screen cleaning process when the viscosity of the recovery liquid is more than 75 cp;
d) The recovery liquid in the coating liquid recovery tank is pumped out through a discharge screw pump, the recovery liquid flows to the coating liquid recovery tank and the transfusion pipeline through a return pipeline and a mixing pipeline respectively, the recovery liquid returns to the coating liquid recovery tank, the concentration value of the recovery liquid is detected through a first concentration meter, and the concentration of the recovery liquid in the coating liquid recovery tank is ensured to be stable through a second stop valve;
meanwhile, according to the information detected by the first concentration meter, the clear water flow of the outlet end of the discharging screw pump of the clear water source is controlled in real time by the adjustable throttle valve through PID adjustment according to the set concentration parameter, and the clear water is mixed with the discharged recovery liquid;
e) When the concentration of the concentrated recovery liquid reaches a preset value, a first stop valve is opened, the recovery liquid enters a transfusion pipeline, and the recovery liquid and the new coating liquid pumped out of a coating liquid in-situ tank are jointly detected on line by a second concentration meter and then enter a coating mechanism;
meanwhile, the control system detects the concentration of the recovery liquid through the first concentration meter, so that the concentration of the recovery liquid in the reflux pipeline and the concentration of the recovery liquid in the mixed pipeline are kept between 40.5 percent plus or minus 0.2 percent, the flow of the recovery liquid is automatically regulated to stabilize the concentration of the mixed liquid, and the concentration of the mixed liquid is stabilized at 41 percent plus or minus 0.5 percent;
f) And the steps are repeated to realize the real-time control of physical indexes of dip-coating type coating liquid of the reconstituted tobacco by the papermaking method.
After the method is adopted, the physical index control method of the dip-coating type coating liquid of the reconstituted tobacco by the papermaking method can ensure the concentration and viscosity stability of the coating liquid in a feeding groove of a coating mechanism, the coating liquid in the dip-coating type coating mechanism is relatively large, and the tobacco substrate passes through the coating liquid, part of paper wool is migrated from the substrate to the coating liquid in the process, and when paper breakage occurs in a production line, the concentration and viscosity of the coating liquid are increased due to the fact that part of damaged substrate enters the coating liquid.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a physical index control device for dip-coating type coating liquid for reconstituted tobacco in the papermaking process.
Fig. 2 is a front view of a coating mechanism in an embodiment of a physical index control device for dip-coating type coating liquid for reconstituted tobacco by the papermaking method.
Fig. 3 is a cross-sectional view of fig. 2.
Detailed Description
As shown in fig. 1 to 3
The physical index control device for dip-coating type coating liquid of reconstituted tobacco by a papermaking method comprises a coating mechanism 1 and a recovery mechanism.
The coating mechanism 1 includes a dip coating bin 1a, a tank bottom screw pump 1g, a coating liquid in-situ tank 1f, a recovery tank 1e, two feed tanks 1d, and two coating rolls 1b.
The cross-sectional shape of the dip coating bin 1a is approximately triangular, an opening is formed in the left side wall of the dip coating bin 1a, two coating rollers 1b are installed at the opening of the dip coating bin 1a, the two coating rollers 1b are sequentially distributed up and down, the axial direction of each coating roller 1b is consistent with the front and rear direction, two ends of the axis of each coating roller 1b are supported on the front side wall and the rear side wall of the dip coating bin 1a, the edge of the opening of the dip coating bin 1a is sealed with the two coating rollers 1b through a sealing strip 1c, and a gap between the two coating rollers 1b is provided with a sealing strip for only passing tobacco substrates.
The feed chute 1d is welded on the dip-coating bin 1a, the feed chute 1d is arranged on the upper side of the dip-coating bin 1a, the length direction of the feed chute 1d is consistent with the axial direction of the coating rollers 1b, the inlet of the feed chute 1d is arranged at the bottom, the upper end face of the feed chute 1d is opened, coating liquid enters the dip-coating bin 1a from the feed chute 1d, the coating liquid is stored in the space between the inner wall of the dip-coating bin 1a and the side walls of the two coating rollers 1b, the liquid level of the coating liquid in the dip-coating bin 1a is higher than the gap position between the two coating rollers 1b, and the recovery tank 1e is communicated with the bottom of the dip-coating bin 1 a.
The inlet of the coating liquid on-site tank 1f is communicated with a coating liquid source, the outlet of the coating liquid on-site tank 1f is communicated with the inlet of the tank bottom screw pump 1g, and the outlet of the tank bottom screw pump 1g is connected with the inlet of the feed tank 1d through a transfusion pipeline.
The infusion line is also provided with a second concentration meter 1h, a fifth stop valve 1j and a third flowmeter 1k.
The recovery mechanism includes a three-way shut-off valve 2a, a rectangular screen 2b, a viscometer 2c, a coating liquid recovery tank 2d, a discharge screw pump 2e, a first flowmeter 2p, a second flowmeter 2g, and a first concentration meter 2j.
The inlet of the three-way stop valve 2a is communicated with the outlet of the recovery tank 1e of the coating mechanism 1, the first outlet of the three-way stop valve 2a is communicated with the coating liquid on-site tank 1f, the second outlet of the three-way stop valve 2a is connected with the inlet of the rectangular sieve 2b, the outlet of the rectangular sieve 2b is communicated with the inlet of the coating liquid recovery tank 2d through the viscometer 2c, the outlet of the coating liquid recovery tank 2d is communicated with the inlet of the discharging screw pump 2e, the outlet of the discharging screw pump 2e is communicated with a clear water source through an adjusting pipeline, an adjustable throttle valve 2f and a second flowmeter 2g are arranged on the adjusting pipeline, the outlet of the discharging screw pump 2e is communicated with the inlet of the coating liquid recovery tank 2d through a reflux pipeline, the reflux pipeline is provided with a second stop valve 2h and a first concentration meter 2j, and the outlet of the discharging screw pump 2e is communicated with the infusion pipeline of the coating mechanism 1 through a mixing pipeline, and the mixing pipeline is provided with the first stop valve 2k and the first flowmeter 2p.
The pipeline between the viscometer 2c and the inlet of the coating liquid recovery tank 2d in the recovery mechanism is also provided with a third stop valve 2n, the pipeline between the viscometer 2c and the third stop valve 2n is communicated with the outside through a cleaning pipeline, and the cleaning pipeline is provided with a fourth stop valve 2m.
The physical index control method for the dip-coating type coating liquid of the reconstituted tobacco by the papermaking method is realized by using the physical index control device for the dip-coating type coating liquid of the reconstituted tobacco by the papermaking method, and comprises the following steps:
a) The newly prepared coating liquid enters the coating liquid on-site tank 1f through a feed pipe, the physical indexes such as concentration, viscosity and the like of the newly prepared coating liquid are stably controlled in the former working section, and the incoming material concentration of the new coating liquid is as follows: 42% +/-0.5% of the material can ensure the stability of physical indexes of the feed coating liquid;
b) The new coating liquid in the coating liquid in-situ tank 1f is pumped out by a tank bottom screw pump 1g and enters a coating mechanism 1 of a physical index control device of the coating liquid for dip-coating type reconstituted tobacco in a papermaking process through a second concentration meter 2 j;
c) The coating liquid becomes recovery liquid after finishing the coating operation of the tobacco substrates, the recovery liquid is intensively discharged by a recovery tank 1e of the coating mechanism 1, the recovery liquid flows back to a rectangular screen 2b through a three-way stop valve 2a for purification treatment (in special cases, for example, when the coating liquid in the coating mechanism 1 is not used in a debugging stage, the coating liquid in the coating mechanism 1 is directly returned to a coating liquid in-situ tank 1 f);
the recovery liquid enters the rectangular sieve 2b for purification treatment, the viscosity of the recovery liquid treated by the rectangular sieve 2b is detected by the viscometer 2c, when the viscosity of the recovery liquid is in a range, the recovery liquid enters the coating liquid recovery tank 2d when the viscosity of the recovery liquid is less than 75cp, and when the viscosity of the recovery liquid is more than 75cp, the recovery liquid is directly subjected to pollution discharge treatment and an automatic cleaning flow of the rectangular sieve 2b is carried out;
d) The recovery liquid in the coating liquid recovery tank 2d is pumped out through the discharge screw pump 2e, the recovery liquid flows to the coating liquid recovery tank 2d and the transfusion pipeline through the reflux pipeline and the mixing pipeline respectively, the recovery liquid flows back to the coating liquid recovery tank 2d, the recovery liquid detects the concentration value of the recovery liquid through the first concentration meter 2j, and the concentration stability of the recovery liquid in the coating liquid recovery tank 2d is ensured through the second stop valve 2 h;
the method avoids clean water from directly entering the coating liquid on-site tank 1f, and the capacity of the tank body of the coating liquid recovery tank 2d is smaller and has higher adjustability;
meanwhile, according to the information detected by the first concentration meter 2j, the clear water flow of the outlet end of the discharging screw pump 2e is controlled in real time by the adjustable throttle valve 2f through PID adjustment according to the set concentration parameter, and the clear water is mixed with the discharged recovery liquid;
e) When the concentration of the concentrated recovery liquid reaches a preset value, a first stop valve 2k is opened, the recovery liquid enters a transfusion pipeline, and the recovery liquid and the new coating liquid pumped out of a coating liquid in-situ tank 1f are jointly detected on line by a second concentration meter 1h and then enter a coating mechanism 1;
meanwhile, the control system detects the concentration of the recovery liquid through the first concentration meter 2j, so that the concentration of the recovery liquid in the reflux pipeline and the concentration of the recovery liquid in the mixed pipeline are kept between 40.5 percent plus or minus 0.2 percent, the flow rate of the recovery liquid is automatically regulated to stabilize the concentration of the mixed liquid, and the concentration of the mixed liquid is stabilized at 41 percent plus or minus 0.5 percent;
f) And the steps are repeated to realize the real-time control of physical indexes of dip-coating type coating liquid of the reconstituted tobacco by the papermaking method.
The foregoing is merely one embodiment of the invention, and it should be noted that variations and modifications could be made by those skilled in the art without departing from the principles of the invention, which would also be considered to fall within the scope of the invention.
Claims (5)
1. A physical index control device for dip-coating type coating liquid of reconstituted tobacco by a papermaking method is characterized in that:
comprises a coating mechanism and a recovery mechanism;
the coating mechanism comprises a tank bottom screw pump, a coating liquid on-site tank, a recovery tank, at least one feeding tank and two coating rollers, wherein the inlet of the coating liquid on-site tank is communicated with a coating liquid source, the outlet of the coating liquid on-site tank is communicated with the inlet of the tank bottom screw pump, and the outlet of the tank bottom screw pump is connected with the inlet of the feeding tank through a transfusion pipeline;
the recovery mechanism comprises a three-way stop valve, a rectangular sieve, a viscometer, a coating liquid recovery tank, a discharge screw pump, a first flowmeter, a second flowmeter and a first concentration meter;
the inlet of the three-way stop valve is communicated with the outlet of the recovery tank of the coating mechanism, the first outlet of the three-way stop valve is communicated with the coating liquid on-site tank, the second outlet of the three-way stop valve is connected with the inlet of the rectangular sieve, the outlet of the rectangular sieve is communicated with the inlet of the coating liquid recovery tank through the viscometer, the outlet of the coating liquid recovery tank is communicated with the inlet of the discharging screw pump through the adjusting pipeline, the outlet of the discharging screw pump is communicated with the clean water source through the adjusting pipeline, the adjusting pipeline is provided with the adjustable throttle valve and the second flowmeter, the outlet of the discharging screw pump is communicated with the inlet of the coating liquid recovery tank through the reflux pipeline, the reflux pipeline is provided with the second stop valve and the first concentration meter, and the outlet of the discharging screw pump is communicated with the infusion pipeline of the coating mechanism through the mixing pipeline, and the mixing pipeline is provided with the first stop valve and the first flowmeter;
and a second concentration meter is also arranged on the infusion pipeline.
2. The physical index control device for dip-coating type coating liquid of reconstituted tobacco by papermaking method according to claim 1, which is characterized in that:
and a third stop valve is further arranged on a pipeline between the viscometer and the inlet of the coating liquid recovery tank in the recovery mechanism, the pipeline between the viscometer and the third stop valve is communicated with the outside through a cleaning pipeline, and a fourth stop valve is arranged on the cleaning pipeline.
3. The physical index control device for dip-coating type coating liquid of reconstituted tobacco by papermaking method according to claim 1, which is characterized in that:
the coating mechanism further comprises a dip coating bin, the feeding groove is arranged on the upper side of the dip coating bin, an opening is formed in the side wall of the dip coating bin, two coating rollers are arranged at the opening of the dip coating bin, the edge of the opening of the dip coating bin is sealed with the two coating rollers, a gap between the two coating rollers is provided with a gap for only passing through tobacco substrates, the liquid level of coating liquid in the dip coating bin is higher than the gap between the two coating rollers, and the recovery groove is communicated with the bottom of the dip coating bin.
4. The physical index control device for dip-coating type coating liquid for reconstituted tobacco by papermaking method according to claim 3, which is characterized in that:
the coating mechanism comprises two feed tanks, the two feed tanks are positioned on the upper side of the dip coating bin, the trend of the feed tanks is consistent with the axial direction of the coating roller, the inlet of each feed tank is positioned at the bottom, and the upper end face of each feed tank is open.
5. A method for realizing physical index control of dip-coating liquid for paper-making reconstituted tobacco by using the physical index control device for dip-coating liquid for paper-making reconstituted tobacco according to any one of claims 1 to 4, comprising the following steps:
a) The newly prepared coating liquid enters a coating liquid on-site tank through a feed pipe, the concentration and viscosity of the newly prepared coating liquid are stably controlled in the former working section, and the incoming material concentration of the new coating liquid concentration is as follows: 42% ± 0.5%;
b) The new coating liquid in the coating liquid in-situ tank is pumped out by a tank bottom screw pump and enters a coating mechanism of a physical index control device of the coating liquid for dip-coating the reconstituted tobacco by the papermaking method through a second concentration meter;
c) The coating liquid becomes recovery liquid after finishing the coating operation of the tobacco substrates, the recovery liquid is intensively discharged by a recovery groove of the coating mechanism, and the recovery liquid flows back to the rectangular screen for purification treatment through the three-way stop valve;
the method comprises the steps that a rectangular screen purifies a recovery liquid, a viscosity meter detects the viscosity of the recovery liquid after the rectangular screen is processed, the recovery liquid is discharged into a recovery tank when the viscosity of the recovery liquid is less than 75cp, the recovery liquid enters a coating liquid recovery tank when the viscosity of the recovery liquid is within a range, and the recovery liquid is directly discharged and subjected to an automatic rectangular screen cleaning process when the viscosity of the recovery liquid is more than 75 cp;
d) The recovery liquid in the coating liquid recovery tank is pumped out through a discharge screw pump, the recovery liquid flows to the coating liquid recovery tank and the transfusion pipeline through a return pipeline and a mixing pipeline respectively, the recovery liquid returns to the coating liquid recovery tank, the concentration value of the recovery liquid is detected through a first concentration meter, and the concentration of the recovery liquid in the coating liquid recovery tank is ensured to be stable through a second stop valve;
meanwhile, according to the information detected by the first concentration meter, the clear water flow of the outlet end of the discharging screw pump of the clear water source is controlled in real time by the adjustable throttle valve through PID adjustment according to the set concentration parameter, and the clear water is mixed with the discharged recovery liquid;
e) When the concentration of the concentrated recovery liquid reaches a preset value, a first stop valve is opened, the recovery liquid enters a transfusion pipeline, and the recovery liquid and the new coating liquid pumped out of a coating liquid in-situ tank are jointly detected on line by a second concentration meter and then enter a coating mechanism;
meanwhile, the control system detects the concentration of the recovery liquid through the first concentration meter, so that the concentration of the recovery liquid in the reflux pipeline and the concentration of the recovery liquid in the mixed pipeline are kept between 40.5 percent plus or minus 0.2 percent, the flow of the recovery liquid is automatically regulated to stabilize the concentration of the mixed liquid, and the concentration of the mixed liquid is stabilized at 41 percent plus or minus 0.5 percent;
f) And the steps are repeated to realize the real-time control of physical indexes of dip-coating type coating liquid of the reconstituted tobacco by the papermaking method.
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