Preparation method and device of indigo dyeing BC reducing solution

Abstract

The invention relates to a method and a device for preparing an indigo dyeing BC reducing solution. The technical problem to be solved by the invention is to provide the preparation method and the device of the BC reducing solution for indigo dyeing, which solve the problems encountered in production by adopting a method that the BC solution is instantly dissolved and used, not only can fully dissolve sodium hydrosulfite in the BC solution and quickly and efficiently meet the process conditions of dyeing production, but also can reduce the waste of dye and chemical materials caused by hydrolysis. According to the method, a'small-amount and multiple-time 'material melting mode is adopted, so that the effect of immediately melting and immediately using is achieved, and'fresh' use of the BC liquid is effectively achieved. The chemical material amount each time is controlled to be used up within one hour, so that the hydrolysis loss of the sodium hydrosulfite is reduced, and the stable dyeing control is facilitated. And on-line automatic adjustment and use are realized, and no other manual intervention is needed in the process as long as raw material supply is ensured. Formula setting and conversion are flexible, rapid replacement of new and old BC liquid can be achieved, and dyeing parameters can be adjusted in time. The consumption is more accurate, material melting according to plans is facilitated, and the loss of redundant materials is reduced.

Description

Technical Field

[0001] The invention relates to a preparation method and a device of indigo dyeing BC reducing solution. Background Art

[0002] There are many influencing factors in the production process of denim indigo dyeing, such as indigo concentration, stability of mother liquor indicators, dye liquor temperature, conductivity, etc. The most typical influencing factors are the ORP and pH of the dye liquor. The technicians engaged in this profession are familiar with the importance of controlling these two indicators and their impact on color, so they will do specific tests to promptly discover deviations and make corresponding adjustments in operations.

[0003] A relatively common practice is to add a quantitative amount of insurance powder and alkaline water into the circulation system, but there are some differences in the methods of supplementation: some manufacturers push the insurance powder into the dyeing system in a quantitative manner through a powder pusher. The advantage of this is that it is relatively simple and intuitive, and it is convenient to calculate the dosage and make adjustments (alkaline water is also added to the system separately); the disadvantage is that there is a problem of insufficient dissolution of the insurance powder. Since the feeding and production are completed at the same time, the insurance powder that is not fully dissolved will be directly taken away by the dyed yarn, which cannot achieve the best reduction effect. At the same time, it will also increase the number of particulate matter in the dye solution, which will have an adverse effect on the dyeing system.

[0004] There is also a method of mixing and dissolving the sodium hypochlorite and liquid alkali (i.e. BC reducing solution, referred to as BC liquid) before using it. The amount of material dissolved at one time is about 300 liters or more, and the use time is generally more than 5 hours. Through the detection and comparison of the stability of the BC liquid, it can be found that after more than 2 hours, the chemical composition (free sodium hypochlorite and ORP value) in the BC liquid begins to show a decreasing trend to varying degrees over time, and the dyeing system begins to change in a trend. Although this method solves the problem of sodium hypochlorite solubility, it is not good for dyeing control, and it will also cause certain losses due to the hydrolysis of dyes; of course, there are other application methods, which are not listed here one by one, but the common problems that exist have not been effectively solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and device for preparing indigo dyeing BC reducing solution which adopts the method of using BC solution immediately after dissolving to solve the problems encountered in production, so as to fully dissolve the insurance powder in the BC solution, quickly and efficiently meet the process conditions of dyeing production, and reduce the waste of dyes and chemicals caused by hydrolysis.

[0006] The present invention adopts the following technical solution: The present invention comprises a chemical material barrel, a powder pusher, a soft water end and a liquid alkali end. The upper end of the chemical material barrel is respectively provided with a powder material inlet, a soft water inlet and a liquid alkali inlet. The output end of the powder pusher is connected with the powder material inlet. The soft water pipe output end of the soft water end is connected with the soft water inlet. The liquid alkali pipe output end of the liquid alkali end is connected with the liquid alkali inlet. The lower end of the chemical material barrel is provided with a first sewage outlet and a first liquid outlet. A stirrer is provided in the chemical material barrel. The invention is characterized in that it also includes a relay barrel, wherein the upper end of the relay barrel is provided with a liquid inlet, the liquid inlet is connected with the first liquid outlet of the chemical barrel, a liquid level meter is provided inside the relay barrel, and the lower end of the relay barrel is provided with a second liquid outlet and a second sewage outlet. The soft water pipe is provided with a first manual valve, a first flow meter and a first pneumatic valve, and the liquid alkali pipe is provided with a second manual valve, a second flow meter and a second pneumatic valve.

[0007] Use the following steps: 1. First, maintain the chemical formula and store it in the system chip for the program to execute specific instructions.

[0008] 2. Before starting the program, all automatic valves in the system are in the closed state. You only need to open the manual valves on the soft water pipe and liquid alkali pipe.

[0009] 3. Select the required formula and start the program, and automatically perform operations according to the chemical formula and logical instructions: ① First, open the automatic valve of the soft water pipeline, add the set amount of soft water into the chemical tank, and then close it immediately; ② Automatically open the liquid alkali pneumatic valve, and then add the set amount of liquid alkali into the chemical barrel and close it immediately; ③Automatically start the mechanical agitator; ④ The powder pusher starts to work automatically. The amount of insurance powder added is calculated according to the amount pushed in at the rated frequency, and the time is limited. It will automatically stop working after reaching the specified time; ⑤The stirrer continues stirring and stops after 8 minutes (until the hydrosulfite is fully dissolved); ⑥ When used for the first time (or the relay tank is empty), the manual valves of the liquid outlet pipe and the liquid supply pipe should be in the closed state. After the stirring stops, the manual valve of the liquid outlet pipe can be opened (there is no need to operate the valve again after the first activation until the machine is turned off). At this time, the BC liquid in the chemical tank begins to flow into the relay tank until the chemical tank is emptied and the pneumatic valve of the liquid outlet pipe is automatically closed.

[0010] ⑦ When the machine is in use, open the valve of the liquid supply pipe and the quantitative equipment will replenish the liquid into the machine's circulation tank for use.

[0011] ⑧When the liquid level in the relay barrel reaches point A, the material dispensing instruction is started again to repeat the previous material dispensing process.

[0012] ⑨ When the liquid level in the relay barrel reaches point B (this time should exceed one chemical reaction cycle, at which time the chemical reaction barrel has completed chemical reaction and is in standby state), the system automatically opens the pneumatic valve of the liquid outlet pipe again, and the BC liquid flows from the chemical reaction barrel into the relay barrel again. After the flow is completed, the pneumatic valve of the liquid outlet pipe is automatically closed.

[0013] ⑩The system automatically repeats the above steps to complete all chemical processing work.

[0014] The positive effects of the present invention are as follows: ① Adopt the “small amount and multiple times” method of dissolving materials to achieve the effect of immediate use, and effectively use the BC liquid “freshly”.

[0015] ② The amount of chemical should be controlled to be used up within 1 hour each time, which can reduce the loss of hydrolysis of insurance powder and is more conducive to stable dyeing control.

[0016] ③Online automatic adjustment and use, as long as the raw material supply is guaranteed, no other manual intervention is required.

[0017] ④ The formula setting and change are flexible, and the new and old BC liquids can be quickly replaced, which is conducive to timely adjustment of dyeing parameters.

[0018] ⑤ The dosage is more accurate, which is conducive to material preparation according to plan and reduces the loss of excess materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0020] As attached Figure 1 As shown, the present invention comprises a chemical material barrel 1, a powder pusher 3, a soft water end and a liquid alkali end. The upper end of the chemical material barrel 1 is respectively provided with a powder inlet, a soft water inlet and a liquid alkali inlet. The output end of the powder pusher 3 is connected to the powder inlet, the output end of the soft water pipe 4 of the soft water end is connected to the soft water inlet, the output end of the liquid alkali pipe 8 of the liquid alkali end is connected to the liquid alkali inlet, the lower end of the chemical material barrel 1 is provided with a first sewage outlet 17 and a first liquid outlet 12, and a stirrer 18 is provided in the chemical material barrel 1. It is characterized in that it also includes a relay barrel 2, the upper end of the relay barrel 2 is provided with a liquid inlet 13, the liquid inlet 13 is connected to the first liquid outlet 12 of the chemical barrel 1, a liquid level meter 14 is provided inside the relay barrel 2, and the lower end of the relay barrel 2 is provided with a second liquid outlet 15 and a second sewage outlet 16. The soft water pipe 4 is provided with a first manual valve 5 , a first flow meter 6 and a first pneumatic valve 7 , and the liquid alkali pipe 8 is provided with a second manual valve 9 , a second flow meter 10 and a second pneumatic valve 11 .

[0021] The structure of the machine and the functions of each component: ① 80L capacity barrel (Φ450*H500, with drain port): 2, one for chemical barrel and one for relay barrel, installed in high and low positions.

[0022] ② Powder pusher (including matching variable frequency motor): 1 unit, the maximum push amount of insurance powder is required to be 1000g / min, installed on the edge of the chemical barrel, used for quantitative feeding to the chemical barrel.

[0023] ③Soft water pipeline and liquid alkali pipeline (equipped with pneumatic valve and manual valve control): 1 set each, used to supply water and alkali to the chemical barrel.

[0024] ④ Mechanical agitator (including supporting drive motor): 1 set, used for stirring and dissolving materials.

[0025] ⑤ Flowmeter: 2, installed on the soft water pipe and liquid alkali pipe, used for material metering control. (Or liquid level meter: 1, installed inside the chemical barrel, used for liquid level metering control.) This case uses flowmeter for metering control.

[0026] ⑥Liquid outlet pipe (equipped with pneumatic valve and manual valve control): 1 set, installed at the bottom of the chemical barrel, flowing to the relay barrel.

[0027] ⑦Liquid level controller (or liquid level meter): 1, installed inside the relay barrel, used for signal transmission when the liquid level is specified.

[0028] ⑧Liquid supply pipe (equipped with manual valve): 1 piece, installed at the bottom of the relay barrel, used to supply materials to the machine.

[0029] ⑨Supporting electrical components (PLC, inverter, touch screen, etc.): 1 set, used for recipe editing, storage and process drive of chemical operation.

[0030] ⑩Automatic control program: 1 set, used for executing chemical material instructions to automatically meet the material needs of the machine. The program stores the proportions of different chemical material formulas separately, and the program adopts commercially available technology.

[0031] The present invention adopts the following method steps: 1. First, maintain the chemical formula and store it in the system chip for the program to execute specific instructions.

[0032] 2. Before starting the program, all automatic valves in the system are in the closed state. You only need to open the manual valves on the soft water pipe and liquid alkali pipe.

[0033] 3. Select the required formula and start the program, and automatically perform operations according to the chemical formula and logical instructions: ① First, open the automatic valve of the soft water pipeline, add the set amount of soft water into the chemical tank, and then close it immediately; ② Automatically open the liquid alkali pneumatic valve, and then add the set amount of liquid alkali into the chemical barrel and close it immediately; ③Automatically start the mechanical agitator; ④ The powder pusher starts to work automatically. The amount of insurance powder added is calculated according to the amount pushed in at the rated frequency, and the time is limited. It will automatically stop working after reaching the specified time; ⑤The stirrer continues stirring and stops after 8 minutes (until the hydrosulfite is fully dissolved); ⑥ When used for the first time (or the relay tank is empty), the manual valves of the liquid outlet pipe and the liquid supply pipe should be in the closed state. After the stirring stops, the manual valve of the liquid outlet pipe can be opened (there is no need to operate the valve again after the first activation until the machine is turned off). At this time, the BC liquid in the chemical tank begins to flow into the relay tank until the chemical tank is emptied and the pneumatic valve of the liquid outlet pipe is automatically closed.

[0034] ⑦ When the machine is in use, open the valve of the liquid supply pipe and the quantitative equipment will replenish the liquid into the machine's circulation tank for use.

[0035] ⑧When the liquid level in the relay barrel reaches point A, the material dispensing instruction is started again to repeat the previous material dispensing process.

[0036] ⑨ When the liquid level in the relay barrel reaches point B (this time should exceed one chemical reaction cycle, at which time the chemical reaction barrel has completed chemical reaction and is in standby state), the system automatically opens the pneumatic valve of the liquid outlet pipe again, and the BC liquid flows from the chemical reaction barrel into the relay barrel again. After the flow is completed, the pneumatic valve of the liquid outlet pipe is automatically closed.

[0037] ⑩The system automatically repeats the above steps to complete all chemical processing work.

[0038] Note: When the formula of the BC liquid used needs to be adjusted, you can directly maintain or call a new formula and run it again. The existing BC liquid can be manually processed according to the situation. It is flexible and convenient, with less waste, and does not affect the normal production of the machine.

Claims

1. A device for preparing indigo dyeing BC reducing liquid, comprising a material chemical barrel (1), a powder pusher (3), a soft water end and a liquid alkali end, wherein the upper end of the material chemical barrel (1) is respectively provided with a powder inlet, a soft water inlet and a liquid alkali inlet, the output end of the powder pusher (3) is connected to the powder inlet, the output end of the soft water pipe (4) of the soft water end is connected to the soft water inlet, the output end of the liquid alkali pipe (8) of the liquid alkali end is connected to the liquid alkali inlet, the lower end of the material chemical barrel (1) is provided with a first sewage outlet (17) and a first liquid outlet (12), and a stirrer (18) is provided in the material chemical barrel (1); Features It also comprises a relay barrel (2), wherein the upper end of the relay barrel (2) is provided with a liquid inlet (13), the liquid inlet (13) is connected to the first liquid outlet (12) of the chemical barrel (1), a liquid level meter (14) is provided inside the relay barrel (2), and the lower end of the relay barrel (2) is provided with a second liquid outlet (15) and a second sewage outlet (16), The soft water pipe (4) is provided with a first manual valve (5), a first flow meter (6) and a first pneumatic valve (7), and the liquid alkali pipe (8) is provided with a second manual valve (9), a second flow meter (10) and a second pneumatic valve (11).

2. The method for preparing indigo dyeing BC reducing solution by the preparation device according to claim 1, characterized in that Use the following steps:

1. First, maintain the chemical formula and store it in the system chip for the program to execute specific instructions.

2. Before the program starts, all automatic valves in the system are in a closed state. You only need to open the manual valves on the soft water pipeline and the liquid alkali pipeline.

3. Select the required formula and start the program, and automatically perform operations according to the chemical formula and logical instructions: ① First, open the automatic valve of the soft water pipeline, add the set amount of soft water into the chemical tank, and then close it immediately; ② Automatically open the liquid alkali pneumatic valve, and then add the set amount of liquid alkali into the chemical barrel and close it immediately; ③Automatically start the mechanical agitator; ④ The powder pusher starts to work automatically. The amount of insurance powder added is calculated according to the amount pushed in at the rated frequency. It is limited by time and stops working automatically after reaching the specified time. ⑤The stirrer continues stirring and stops after 8 minutes (until the hydrosulfite is fully dissolved); ⑥When used for the first time (or the relay tank is empty), the manual valves of the liquid outlet pipe and the liquid supply pipe should be closed. After the stirring stops, the manual valve of the liquid outlet pipe can be opened (there is no need to operate the valve again after the first use until the machine is turned off). At this time, the BC liquid in the chemical tank begins to flow into the relay tank until the chemical tank is emptied, and the pneumatic valve of the liquid outlet pipe is automatically closed. ⑦ When the machine is in use, open the valve of the liquid supply pipe and the quantitative equipment will add liquid into the machine circulation tank for use. ⑧When the liquid level in the relay tank reaches point A, the material dispensing instruction is started again to repeat the last material dispensing process. ⑨ When the liquid level in the relay tank reaches point B (this time should exceed one chemical cycle, at which time the chemical tank has finished chemical processing and is in standby state), the system automatically opens the pneumatic valve of the liquid outlet pipe again, and the BC liquid flows from the chemical tank into the relay tank again. After the flow is completed, the pneumatic valve of the liquid outlet pipe is automatically closed. ⑩The system automatically repeats the above steps to complete all chemical processing work.

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