CN111020716A - Cleaning method of high molecular polymer melt spinning spinneret plate - Google Patents
Cleaning method of high molecular polymer melt spinning spinneret plate Download PDFInfo
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- CN111020716A CN111020716A CN201911069499.0A CN201911069499A CN111020716A CN 111020716 A CN111020716 A CN 111020716A CN 201911069499 A CN201911069499 A CN 201911069499A CN 111020716 A CN111020716 A CN 111020716A
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- spinneret plate
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/04—Cleaning spinnerettes or other parts of the spinnerette packs
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- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a cleaning method of a high molecular polymer melt spinning spinneret plate, which comprises the steps of putting the disassembled spinneret plate into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning to obtain a pretreated spinneret plate; carrying out blow-drying on the pretreated spinneret plate and carrying out spinning hole detection on the blow-dried spinneret plate; putting the blow-dried spinneret plate with more than 80% of spinning holes as through holes into a salt bath furnace for preheating and salt bath to obtain the spinneret plate of the salt bath; cooling the spinneret plate of the salt bath, and then carrying out ultrasonic cleaning and blow-drying on the spinneret plate to obtain a spinneret plate which is washed and blow-dried for the first time; putting the spinneret plate which is washed and dried by water for the first time into a containing groove containing dilute nitric acid for soaking to obtain a pickled spinneret plate; carrying out ultrasonic cleaning and blow-drying on the acid-washed spinneret plate to obtain a twice-washed and blow-dried spinneret plate; and (4) carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying until the spinneret plate is qualified in cleaning, and finishing the cleaning. The cleaning efficiency is improved, and the cleanliness is ensured.
Description
Technical Field
The invention relates to the technical field of cleaning of spinneret plates in the chemical fiber manufacturing industry, in particular to a method for cleaning a high-molecular polymer melt spinning spinneret plate.
Background
After the melt spinning, have the defective material (polycarbosilane) to glue on spinneret orifice surface and spinneret orifice inner wall, what the melt spinning in-process adopted is that the spinneret orifice diameter is 0.3mm, have 500 spinneret orifices evenly distributed, turn into the cylinder type trickle with the main effect of spinneret with the high polymer fuse-element through the micropore, form the sliver through solidifying, if there is the defective material (polycarbosilane) unable sanitization in the spinneret orifice, can cause the precursor thickness unusual, can't guarantee diameter homogeneity, cause the decline of fibre mechanical properties. Especially, the spinning holes with the diameter of 0.3mm are adopted in production, the cleaning is troublesome, and if the cleaning is improper, the spinning holes are damaged or deformed particularly by slight collision, and certain economic loss is caused.
In addition, when individual spinning holes in the spinneret plate are blocked, the melts passing through the spinning holes are easy to form profiled fiber precursor, and the fiber precursor is thinner than the precursor of a normal spinning hole, so that filament breakage is caused, and the mechanical property of the fiber is influenced; when the melt is extruded out of the spinning holes, the melt can flow to the surrounding normal spinning holes, so that more broken filaments are generated.
Disclosure of Invention
Aiming at the problems, the invention provides a cleaning method of a high molecular polymer melt spinning spinneret plate, which reduces the process links, shortens the cleaning process and simultaneously can greatly improve the cleaning efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a cleaning method of a high molecular polymer melt spinning spinneret plate comprises the following steps:
A) pretreatment: unloading the melt spinning spinneret assembly from spinning equipment, putting the disassembled spinneret into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning, controlling soaking time and ultrasonic cleaning time, and taking out after cleaning is finished to obtain a pretreated spinneret;
B) drying and detecting: the pretreated spinneret plate obtained in the step A) is dried by blowing, and the dried spinneret plate is subjected to spinning hole detection, wherein the dried spinneret plate is placed on an optical projector, the aperture and the wall smoothness of the spinning holes of the spinneret plate are observed and imaged, the step A is repeated if the spinning holes of the spinneret plate are blocked by more than 20 percent, and the step A) is continued until more than 80 percent of the spinning holes of the spinneret plate are through holes;
C) salt bath: putting the spinneret plate dried by the step B) and provided with more than 80% of spinning holes as through holes into a salt bath furnace for preheating and salt bath, and controlling the temperature of the salt bath furnace, the preheating time of the spinneret plate and the salt bath time to obtain the spinneret plate of the salt bath;
D) washing and drying for the first time: taking out the spinneret plate of the salt bath obtained in the step C) from the salt bath furnace, cooling the spinneret plate, putting the cooled spinneret plate into ultrasonic cleaning equipment for ultrasonic cleaning, drying the spinneret plate after cleaning, and controlling the cooling time, the cleaning time of ultrasonic waves and the drying time to obtain a spinneret plate which is washed with water and dried for one time;
E) acid washing: putting the spinneret plate which is washed and dried by the first time and obtained in the step D) into a containing groove containing dilute nitric acid for soaking, and controlling the soaking time to obtain a pickled spinneret plate;
F) and (3) secondary water washing and drying: putting the acid-washed spinneret plate obtained in the step E) into ultrasonic cleaning equipment for ultrasonic cleaning, drying the cleaned spinneret plate by blowing, and controlling the cleaning time and the blowing time of ultrasonic waves to obtain a spinneret plate which is washed by water for the second time and dried by blowing;
G) and (3) final detection: carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying obtained in the detection step F), detecting whether the obtained spinneret plate subjected to secondary washing and drying is qualified or not, and finishing the cleaning if the spinneret plate subjected to secondary washing and drying is qualified; and if the cleaning is unqualified, repeating the steps C) to F) until the cleaning is qualified, and finishing the cleaning.
This application soaks the spinneret with xylol for can effectual dissolution remain at most high polymer on the spinneret, can oxidize remaining high polymer through the salt bath, thereby effectual incomplete material of getting rid of on the spinning hole inner wall has improved cleaning efficiency when shortening the scavenging period, has guaranteed the cleanliness of spinneret spinning hole.
Preferably, the soaking time in step a) is controlled to be 1.5 to 2.5 days, and the soaking period is 1 hour every 8 hours by ultrasonic cleaning.
Preferably, the spinning hole detection in the steps B) and G) is to place the blow-dried spinneret plate on an optical projector, observe the aperture and wall smoothness of the spinning hole of the spinneret plate and image the aperture and wall smoothness.
Preferably, the specific steps of step C) are: heating the salt bath furnace to 400-500 ℃ and preserving heat, placing the spinneret plate above the salt bath furnace to preheat the spinneret plate for 25-35 minutes, and then placing the spinneret plate into the salt bath furnace containing salt bath materials for 35-45 minutes.
Preferably, the salt bath material consists of sodium nitrate, sodium nitrite and sodium hydroxide, wherein the mass ratio of the three components is 40 wt percent: 40% wt: 20% wt; in this preferred scheme, select the salt bath material that comprises sodium nitrate, sodium nitrite and sodium hydroxide, utilize the strong oxidizing property of sodium nitrite promptly, can oxidize the residual high-molecular polymer on the spinning hole, the oxidation efficiency is high, and oxidation effect is good, has guaranteed the cleanliness of spinneret.
Preferably, the cooling method adopted in the step D) is cooling in air at normal temperature for 3-4 hours.
Preferably, the ultrasonic cleaning time controlled in the step D) and the step F) is controlled to be 25 to 35 minutes, wherein the cleaning medium for ultrasonic cleaning is purified water.
Preferably, the blowing drying mode in the step B), the step D) and the step F) is to blow pure compressed air to the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning through an air pressure gun, wherein the blowing time is 10-15 minutes.
Preferably, the soaking time in the step E) is 1.5-2.5 hours.
From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:
according to the cleaning method of the high polymer melt spinning spinneret plate, the spinneret plate is soaked by dimethylbenzene, so that most of high polymer remaining on the spinneret plate can be effectively dissolved, and the residual high polymer can be oxidized by salt bath, so that residual materials on the inner wall of a spinning hole are effectively removed, the cleaning time is shortened, the cleaning efficiency is improved, and the cleanliness of the spinning hole of the spinneret plate is ensured.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to examples.
Example 1
A cleaning method of a high molecular polymer melt spinning spinneret plate comprises the following steps:
A) pretreatment: unloading the melt spinning spinneret assembly from spinning equipment, putting the disassembled spinneret into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning, wherein the time of soaking the spinneret in the dimethylbenzene is 1.5 days, ultrasonic cleaning is carried out for 1 hour every 8 hours during soaking, and the spinneret is taken out after cleaning is finished to obtain a pretreated spinneret;
B) drying and detecting: purging pure compressed air from the pretreated spinneret plate obtained in the step A) through an air pressure gun to clean the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning, wherein the purging time is 10 minutes, then placing the blow-dried spinneret plate on an optical projector, observing the aperture and the wall smoothness of a spinning hole of the spinneret plate and imaging, and repeating the step A) if the spinning hole of the spinneret plate is blocked by more than 20% until the spinning hole of the spinneret plate is a through hole by more than 80%, and continuing to the next step;
C) salt bath: firstly heating a salt bath furnace to 400 ℃ and preserving heat, then placing a spinneret plate which is blow-dried in the step B) and has more than 80% of spinning holes as through holes above the salt bath furnace to preheat the spinneret plate for 25 minutes, and then placing the spinneret plate into the salt bath furnace containing salt bath materials for 35 minutes, wherein the salt bath materials comprise sodium nitrate, sodium nitrite and sodium hydroxide, and the mass ratio of the three is 40 wt%: 40% wt: 20% wt to obtain a spinneret for a salt bath;
D) washing and drying for the first time: taking out the spinneret plate of the salt bath obtained in the step C) from the salt bath furnace, placing the spinneret plate in air, cooling for 3 hours at normal temperature, placing the cooled spinneret plate into ultrasonic cleaning equipment containing purified water, carrying out ultrasonic cleaning for 25 minutes, cleaning, and blowing pure compressed air on the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning through an air pressure gun, wherein the blowing time is 10-15 minutes, so as to obtain the spinneret plate subjected to primary water cleaning and blow drying;
E) acid washing: putting the spinneret plate which is washed and dried by the first time and obtained in the step D) into a containing groove containing dilute nitric acid for soaking for 1.5 hours to obtain a pickled spinneret plate;
F) and (3) secondary water washing and drying: putting the acid-washed spinneret plate obtained in the step E) into ultrasonic cleaning equipment filled with purified water for ultrasonic cleaning for 25 minutes, and blowing pure compressed air on the front surface and the back surface of the ultrasonically cleaned spinneret plate through an air pressure gun, wherein the blowing time is 10 minutes, so as to obtain a twice-washed and blow-dried spinneret plate;
G) and (3) final detection: carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying obtained in the detection step F), detecting whether the obtained spinneret plate subjected to secondary washing and drying is qualified or not, and finishing the cleaning if the spinneret plate subjected to secondary washing and drying is qualified; and if the cleaning is unqualified, repeating the steps C) to F) until the cleaning is qualified, and finishing the cleaning.
Example 2
A cleaning method of a high molecular polymer melt spinning spinneret plate comprises the following steps:
A) pretreatment: unloading the melt spinning spinneret assembly from spinning equipment, putting the disassembled spinneret into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning, wherein the time of soaking the spinneret in the dimethylbenzene is 2 days, ultrasonic cleaning is carried out for 1 hour every 8 hours during soaking, and the spinneret is taken out after cleaning is finished to obtain a pretreated spinneret;
B) drying and detecting: purging pure compressed air on the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning by using the pretreated spinneret plate obtained in the step A) through an air pressure gun, wherein the purging time is 12 minutes, then placing the blow-dried spinneret plate on an optical projector, observing the aperture and the wall smoothness of a spinning hole of the spinneret plate and imaging, and repeating the step A) if the spinning hole of the spinneret plate is blocked by more than 20% until the spinning hole of the spinneret plate is a through hole by more than 80%, and continuing to the next step;
C) salt bath: heating the salt bath furnace to 450 ℃ and preserving heat, then placing the spinneret plate which is blow-dried in the step B) and has more than 80% of spinning holes as through holes above the salt bath furnace to preheat the spinneret plate for 30 minutes, and then placing the spinneret plate into the salt bath furnace containing salt bath materials for 40 minutes, wherein the salt bath materials comprise sodium nitrate, sodium nitrite and sodium hydroxide, and the mass ratio of the three materials is 40 wt%: 40% wt: 20% wt to obtain a spinneret for a salt bath;
D) washing and drying for the first time: taking out the spinneret plate of the salt bath obtained in the step C) from the salt bath furnace, placing the spinneret plate in air, cooling the spinneret plate for 3.5 hours at normal temperature, placing the cooled spinneret plate into ultrasonic cleaning equipment containing purified water, carrying out ultrasonic cleaning for 30 minutes, cleaning, and blowing pure compressed air through an air pressure gun to the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning, wherein the blowing time is 12 minutes, so as to obtain the spinneret plate subjected to primary water cleaning and blow drying;
E) acid washing: putting the spinneret plate which is washed and dried by the first time and obtained in the step D) into a containing groove containing dilute nitric acid for soaking for 2 hours to obtain a pickled spinneret plate;
F) and (3) secondary water washing and drying: putting the acid-washed spinneret plate obtained in the step E) into ultrasonic cleaning equipment filled with purified water for 30 minutes for ultrasonic cleaning, and blowing pure compressed air on the front surface and the back surface of the ultrasonically cleaned spinneret plate through an air pressure gun, wherein the blowing time is 12 minutes, so as to obtain a twice-washed and blow-dried spinneret plate;
G) and (3) final detection: carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying obtained in the detection step F), detecting whether the obtained spinneret plate subjected to secondary washing and drying is qualified or not, and finishing the cleaning if the spinneret plate subjected to secondary washing and drying is qualified; and if the cleaning is unqualified, repeating the steps C) to F) until the cleaning is qualified, and finishing the cleaning.
Example 3
A cleaning method of a high molecular polymer melt spinning spinneret plate comprises the following steps:
A) pretreatment: unloading the melt spinning spinneret assembly from spinning equipment, putting the disassembled spinneret into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning, wherein the time of soaking the spinneret in the dimethylbenzene is 2.5 days, ultrasonic cleaning is carried out for 1 hour every 8 hours during soaking, and the spinneret is taken out after cleaning is finished to obtain a pretreated spinneret;
B) drying and detecting: purging pure compressed air on the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning by using the pretreated spinneret plate obtained in the step A) through an air pressure gun, wherein the purging time is 15 minutes, then placing the blow-dried spinneret plate on an optical projector, observing the aperture and the wall smoothness of a spinning hole of the spinneret plate and imaging, and repeating the step A) if the spinning hole of the spinneret plate is blocked by more than 20% until the spinning hole of the spinneret plate is a through hole by more than 80%, and continuing to the next step;
C) salt bath: heating the salt bath furnace to 500 ℃ and preserving heat, then placing the spinneret plate which is blow-dried in the step B) and has more than 80% of spinning holes as through holes above the salt bath furnace to preheat the spinneret plate for 35 minutes, and then placing the spinneret plate into the salt bath furnace containing salt bath materials for 45 minutes, wherein the salt bath materials comprise sodium nitrate, sodium nitrite and sodium hydroxide, and the mass ratio of the three is 40 wt%: 40% wt: 20% wt to obtain a spinneret for a salt bath;
D) washing and drying for the first time: taking out the spinneret plate of the salt bath obtained in the step C) from the salt bath furnace, placing the spinneret plate in air, cooling for 4 hours at normal temperature, placing the cooled spinneret plate into ultrasonic cleaning equipment containing purified water, carrying out ultrasonic cleaning for 35 minutes, cleaning, and blowing pure compressed air on the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning through an air pressure gun, wherein the blowing time is 15 minutes, so as to obtain the spinneret plate subjected to primary water cleaning and blow drying;
E) acid washing: putting the spinneret plate which is washed and dried by the first time and obtained in the step D) into a containing groove containing dilute nitric acid for soaking for 2.5 hours to obtain a pickled spinneret plate;
F) and (3) secondary water washing and drying: putting the acid-washed spinneret plate obtained in the step E) into ultrasonic cleaning equipment filled with purified water for 35 minutes for ultrasonic cleaning, and blowing pure compressed air on the front surface and the back surface of the ultrasonically cleaned spinneret plate through an air pressure gun, wherein the blowing time is 15 minutes, so as to obtain a twice-washed and blow-dried spinneret plate;
G) and (3) final detection: carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying obtained in the detection step F), detecting whether the obtained spinneret plate subjected to secondary washing and drying is qualified or not, and finishing the cleaning if the spinneret plate subjected to secondary washing and drying is qualified; and if the cleaning is unqualified, repeating the steps C) to F) until the cleaning is qualified, and finishing the cleaning.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A cleaning method of a high molecular polymer melt spinning spinneret plate is characterized by comprising the following steps:
A) pretreatment: unloading the melt spinning spinneret assembly from spinning equipment, putting the disassembled spinneret into ultrasonic cleaning equipment containing dimethylbenzene for soaking and ultrasonic cleaning, controlling soaking time and ultrasonic cleaning time, and taking out after cleaning is finished to obtain a pretreated spinneret;
B) drying and detecting: drying the pretreated spinneret plate obtained in the step A) by blowing, detecting spinning holes of the blow-dried spinneret plate, repeating the step A) if the spinning holes of the spinneret plate are blocked by more than 20%, and continuing to the next step until more than 80% of the spinning holes of the spinneret plate are through holes;
C) salt bath: putting the spinneret plate dried by the step B) and provided with more than 80% of spinning holes as through holes into a salt bath furnace for preheating and salt bath, and controlling the temperature of the salt bath furnace, the preheating time of the spinneret plate and the salt bath time to obtain the spinneret plate of the salt bath;
D) washing and drying for the first time: taking out the spinneret plate of the salt bath obtained in the step C) from the salt bath furnace, cooling the spinneret plate, putting the cooled spinneret plate into ultrasonic cleaning equipment for ultrasonic cleaning, drying the spinneret plate after cleaning, and controlling the cooling time, the cleaning time of ultrasonic waves and the drying time to obtain a spinneret plate which is washed with water and dried for one time;
E) acid washing: putting the spinneret plate which is washed and dried by the first time and obtained in the step D) into a containing groove containing dilute nitric acid for soaking, and controlling the soaking time to obtain a pickled spinneret plate;
F) and (3) secondary water washing and drying: putting the acid-washed spinneret plate obtained in the step E) into ultrasonic cleaning equipment for ultrasonic cleaning, drying the cleaned spinneret plate by blowing, and controlling the cleaning time and the blowing time of ultrasonic waves to obtain a spinneret plate which is washed by water for the second time and dried by blowing;
G) and (3) final detection: carrying out spinning hole detection on the spinneret plate subjected to secondary washing and drying obtained in the detection step F), detecting whether the obtained spinneret plate subjected to secondary washing and drying is qualified or not, and finishing the cleaning if the spinneret plate subjected to secondary washing and drying is qualified; and if the cleaning is unqualified, repeating the steps C) to F) until the cleaning is qualified, and finishing the cleaning.
2. The method of claim 1, wherein the cleaning step comprises the steps of: the soaking time is controlled to be 1.5-2.5 days, and the ultrasonic cleaning is carried out for 1 hour every 8 hours during the soaking period.
3. The method of claim 1, wherein the cleaning step comprises the steps of: and the spinning hole detection in the step B) and the step G) is to place the blow-dried spinneret plate on an optical projector, observe the smoothness of the aperture and the wall of the spinning hole of the spinneret plate and image.
4. The method of claim 1, wherein the cleaning step comprises the steps of: the concrete steps of the step C) are as follows: heating the salt bath furnace to 400-500 ℃ and preserving heat, placing the spinneret plate above the salt bath furnace to preheat the spinneret plate for 25-35 minutes, and then placing the spinneret plate into the salt bath furnace containing salt bath materials for 35-45 minutes.
5. The method of claim 4, wherein the cleaning step comprises the steps of: the salt bath material consists of sodium nitrate, sodium nitrite and sodium hydroxide, wherein the mass ratio of the sodium nitrate to the sodium nitrite to the sodium hydroxide is 40 wt percent: 40% wt: 20% wt.
6. The method of claim 1, wherein the cleaning step comprises the steps of: and D), cooling for 3-4 hours at normal temperature in the air in a cooling mode adopted in the step D).
7. The method of claim 1, wherein the cleaning step comprises the steps of: and D) controlling the cleaning time of the ultrasonic waves in the step F) to be 25-35 minutes, wherein the cleaning medium for ultrasonic cleaning is pure water.
8. The method of claim 1, wherein the cleaning step comprises the steps of: blowing the pure compressed air to the front surface and the back surface of the spinneret plate subjected to ultrasonic cleaning through an air pressure gun in the blow-drying mode in the step B), the step D) and the step F), wherein the blowing time is 10-15 minutes.
9. The method of claim 1, wherein the cleaning step comprises the steps of: the soaking time in the step E) is 1.5-2.5 hours.
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| CN201911069499.0A CN111020716A (en) | 2019-11-05 | 2019-11-05 | Cleaning method of high molecular polymer melt spinning spinneret plate |
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| CN201911069499.0A CN111020716A (en) | 2019-11-05 | 2019-11-05 | Cleaning method of high molecular polymer melt spinning spinneret plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114808154A (en) * | 2022-04-23 | 2022-07-29 | 浙江毅聚新材料有限公司 | Cleaning method of spinning assembly |
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