1. Basic knowledge of the dye vat

1. The machine basically consists of a cloth storage tank, a circulation system, a filter and a heat exchanger, a feeding barrel (auxiliary tank), a cloth discharge roller and a folding device and control systems.

2. The circulation of dye liquor is realized by a circulation pump directly driven by a motor. The circulation pump sucks the dye liquor from the bottom of the machine and sends it to the nozzle through the heat exchanger. The nozzle pressure is adjusted by the throttle valve installed on the outlet of the circulation pump. When the main pump motor is driven by a frequency converter, there is no throttle valve. .

3. The pressure gauge and temperature gauge are installed on the machine to display the nozzle pressure and dye liquor temperature respectively.

4. The front part of the heat exchanger is a filter, and a filter screen is installed inside it to cut off the lint in the circulating liquid flow. The heat exchanger is equipped with heating/cooling valves for respectively Realize heating/cooling of dye liquor.

5. The rope-like fabric runs to the front in the cloth storage trough, and is lifted by the lifting roller driven by the variable frequency speed motor, and its speed is displayed on the speed display on the electric control box.

6. The feeding barrel (auxiliary tank) is used for the preparation of dyes and chemicals. Open the water inlet valve or the return valve, and put clean water or dye liquor into the feeding barrel. The solution in the barrel can be stirred by electric stirring. The liquid can be heated by opening the direct steam heating valve.

7. Warning: When the temperature of the dye liquor exceeds 85℃ [185℉], the return valve is not allowed to be opened.

2. Preparation specifications before dyeing and dropping into the vat

1. When the cloth in the previous vat is being dyed and kept warm, find the next round of cloth and push it to the front of the dyeing machine for storage, as follows If the cloth is not ready for one round, please inform the cloth preparation team to complete it as soon as possible.

2. Before each vat is put into a vat, the relevant information must be checked according to the requirements on the work order, such as the odd number of cloth types, the number of cloths, whether the cloth is evenly prepared, etc.

3. Pay attention to whether the previous vat cloth has been made into dark cloth. If you have made dark cloth and then dyed light-colored cloth, you should ask the color table to prescribe a prescription for washing the vat [the prescription for washing the vat is generally Use multi-foaming additives: NaOH, Na2S2O4, 95℃ If you don't have a fan, the fabric will twist when cooking or dyeing. Cut three-inch holes in plain fabrics and fabrics for ventilation, and cut four-inch holes in double-sided and ribbed fabrics.

5. After preparing the cloth for dropping into the vat, send the order to the additive room to weigh out the required additives. Each additive must be checked and correct before being dropped into the vat.

6. The cloth used in the cylinder, whether it is new or repaired, must be checked and weighed to prevent leakage.

3. Specifications for boiling cloth in a vat

1. First understand the knowledge of cloth boiling (refining). Cloth boiling will use chemical methods to remove pigments and impurities on the fibers and improve the water absorption of knitted fabrics. Sex and whiteness, whiteness especially the combination of two colors.

2. Cloth cooking aids generally include HA alkali oil, GLM anti-wrinkle agent, 4+8 degreaser, NaOH burning salt, H2O2? hydrogen peroxide, HAC acetic acid, and ENIYME deoxidizing enzyme.

3. Fill the empty tank with water first, about 1/3 or 2/3 of the water level, first drop HA, GLM, 4+8, raise the temperature to 50°C, and then fill the whole tank with cloth.

4. After entering the cloth, adjust the water level, machine speed, and the time required for setting.

5. Add NaOH about 5' into the cloth row. After adding NaOH, clean the auxiliary tank with clean water and then add H2O2 with return water. If the auxiliary tank is cleaned at the end and there is NaOH residue, when H2O2 comes into contact A chemical reaction will occur, and a lot of foam will appear in the auxiliary tank.

6. After filling in the cloth and adding additives, select the holding time according to the computer program.

7. When the air cylinder is heating up, turn off the automatic air inflator. If the air is too large during operation, open the cylinder door to eliminate the air to prevent excessive air from causing the cloth to fall, roll, or press. If the lowest situation occurs, adjust the pumping pressure to 2-3, and adjust the front and rear shower heads to 3, 4, 5, 6, and 7 more correctly.

8. When making a flat knitting machine, the cylinder must be straightened and must not be half-twisted to avoid creases, and the fabric must be inserted in the specified direction.

9. When making woven fabrics, mercerized cloths, and artificial cotton into the vat for boiling and bleaching, be sure to wrap them in pig cages to prevent slipping and causing friction and marks.

10. The cloth should be stretched for 30-50 seconds, and the temperature should be raised to 50°C to make the cloth fully wet before the thinning agent can be used. Use a ladle to slowly add it along the inner wall of the cylinder without direct contact. Cloth body.

11. When cooking cloth for heat preservation, it is necessary to add dyeing auxiliaries such as HAC and dyes in the single-crossing additive material room.

12. After the boiling cloth is warmed, it must be neutralized by HAC. This HAC cannot be taken too early because it will volatilize (HAC 0.9% 60℃×10') and measure the pH value of 6.5- 7.5.

13. After HACPH is OK, use the deoxidizing enzyme ENZYME 0.02g/l, let it cool for 15 minutes, and measure the H2O2 content (fetch water and bring it to the office for testing)

14 .After each vat of cloth is cooked, it must be cut into an A4-sized piece and handed over to the color matching table. The whiteness directly affects the color, lightness, and sinking of light-sensitive color combinations.

15. Normally, it takes 150 minutes to cook cloth, so all links must be operated quickly and cannot be delayed, otherwise the progress and output will be affected.

16. The operating conditions of each cloth boiling process should be recorded (written by the team leader).

17. All additive barrels must be filled with additives by category.

IV. Dyeing operation specifications.

1. Check the lap speed. A normal lap is 2'30". If it exceeds this range, you should raise your hand to the superior and pull the cylinder for one lap. 30"-50" seconds.

2. Observe whether the cloth is twisted, whether there is poor air pumping (air cylinder), and whether the various valves are closed.

3. Confirm the dyeing procedure. , you need to select the recipe according to the work order. After the selection, the technician or team leader must re-check. When checking the water level, be sure to stop the main pump and let the water stabilize in the water gauge. To check the paint, use a sample [i.e. general Use a piece of paper to test the color water. Only when the color matches, can it be put into the vat for dyeing: Check whether the quantity of the additives is too small or too high, and whether the quality and name are consistent with those on the order. The above inspections are correct, and the team leader signs for confirmation.

4. The dye can only be bathed in the auxiliary tank with clean water, not with hot water or steam.

5. The dye should be pumped into the tank according to the time set by the computer. Don't be too slow.

6. If the machine is not running smoothly when pumping in the dye, stop feeding and raise your hand to handle it.

7. Finish dropping the dye. After cooling for 5 minutes, start adding salt (Nacl, Yuanming powder).

8. Normally, the Yuanming powder is divided into four times, and each portion is added according to the requirements of the work order. It usually takes 40 minutes to pump. After adding Yuan Ming powder Na2SO4, wait for five minutes. Take the dye solution to the office to measure the density and specific gravity of the dye solution. It is strictly forbidden to measure it privately. There is a dedicated person. If the specific gravity is not OK, the colorist will decide to add water or add water. After adding the agent, measure the specific gravity again until it is OK.

9. After the specific gravity is OK, add Na3PO4 or Na2CO3, the number of times is the same as that of the dye additive.

10. When the dye additive is added. , pay attention to the foaming situation. If the foaming is serious, use a defoaming agent to remove the foam. The use of FFC must be approved by the workshop foreman.

11. Dyeing heating and insulation, follow the specified 50℃ heating rate. 0.5℃/min, 60℃ heating rate 0.7℃/min, the holding time should be selected according to the time specified on the sheet.

12. Add dyes and additives to the holding period, and the machine must be running normally, otherwise it will be very serious. It is easy to cause dyeing defects.

5. Post-processing and others

1. After keeping the temperature, it must be neutralized by HAC, 50℃×10' 0.5g/l HAC. , do not take this HAC too early, its characteristic is volatile

2. After neutralizing the HAC, the next step is to boil alkali twice in hot water 95℃×10'. The purpose is to float the dye on the cloth. To remove color residues, if you have a showerhead, boil the showerhead with hot water for the first time.