CN107247019A - A kind of detection method of polyester-imide stainless steel enameled wire baking degree - Google Patents
A kind of detection method of polyester-imide stainless steel enameled wire baking degree Download PDFInfo
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- CN107247019A CN107247019A CN201710438184.3A CN201710438184A CN107247019A CN 107247019 A CN107247019 A CN 107247019A CN 201710438184 A CN201710438184 A CN 201710438184A CN 107247019 A CN107247019 A CN 107247019A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention provides a kind of detection method of polyester-imide stainless steel enameled wire baking degree.The detection method comprises the following steps：1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, cleaned, annealing, drying process, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, cooling of being come out of the stove after japanning, baking, and polyester-imide stainless steel enamel-covered wire is made；2) polyester-imide stainless steel enamel-covered wire is placed in unidirectional scrape and resistance to scraping force is tested in lacquer test instrument, if resistance to scraping force is more than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 4~6cm length, with stainless steel wire tubulose stripping does not occur for insulating polyester imines enamelled coating, then baking degree is considered as qualified.The detection method of the polyester-imide stainless steel enameled wire baking degree of the present invention, it is simple to operate, it can quick and precisely measure the qualified degree of polyester-imide stainless steel enameled wire baking degree.
Description
Technical field
The invention belongs to enamel-covered wire technical field, it is related to a kind of detection side of polyester-imide stainless steel enameled wire baking degree
Method.
Background technology
Electric insulation is the most important part of electrical equipment and electrical, in addition to insulating process and structure design, electrically
In itself, including the quality of enamel-covered wire is to directly affect electrical equipment and electrical reliability and the key in life-span to insulating materials, and enamel-covered wire is electricity
The main raw material(s) of the products such as mechanical, electrical device and household electrical appliance, particularly power industry in recent years, which is realized, maintains sustained and rapid growth, family
Electrical appliance is developed rapidly, and the application to enamel-covered wire brings broader field, the thing followed is that enamel-covered wire is proposed more
High requirement.Not enough, and enamel-covered wire is during storage and use for baking degree too low enamel-covered wire curing degree, if environment
Humidity, the enamel-covered wire moisture absorption deterioration that curing degree can be enable inadequate causes its relatively low proof voltage, draftability and pin hole not
It is qualified, and then influence the mechanical performance and electric property of enamel-covered wire.
The inherent quality of enamel-covered wire can be analyzed, controlled using dielectric analysis method, be to promote home products to mount to be born in state
The important channel in border market.Enameled wire coat film forming is a high molecular crosslink course of reaction, and it is relevant with the extent of reaction, namely
The curing degree of paint film, before reaction reaches to a certain degree, the curing degree of paint film is slowly being improved, the increase of paint film crosslinking points, molecule
Amount increase, glass transition temperature also increases, and therefore, enamel solidity is relevant with glass transition temperature.When paint film is heated, in glassy state
Limited proportionality dielectric loss tg δ undergo mutation (become big), (the i.e. glass of corresponding temperature when can obtain generation mutation by tangential method
Glass temperature), so, can use tg δ and glass transition temperature Tg relation, the curing degree of indirect analysis paint film, here it is with
Dielectric loss analyzes the mechanism of enamel solidity.Current dielectric analysis method is that dielectric tangent constant test method can be detected
Paint film baking degree, but such a method of testing is only applicable to the enamel-covered wire that conductor is copper, for the enamel-covered wire that conductor is stainless steel
It can not use.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of polyester-imide stainless steel enameled wire baking degree
Detection method, it is simple to operate, can quick and precisely measure the qualified degree of polyester-imide stainless steel enameled wire baking degree.
For up to this purpose, the present invention uses following technical scheme：
A kind of detection method of polyester-imide stainless steel enameled wire baking degree, comprises the following steps：
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, cleaned, annealing, drying
Processing, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, after japanning, bakeing
Come out of the stove cooling, polyester-imide stainless steel enamel-covered wire is made；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into the attachment shape of 4~6cm length, detection insulating polyester imines enamelled coating and stainless steel wire
State；
If resistance to scraping force is more than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 4~6cm length, insulating polyester
With stainless steel wire tubulose stripping does not occur for imines enamelled coating, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as qualified；
If resistance to scraping force is less than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 4~6cm length, insulating polyester
Imines enamelled coating occurs tubulose with stainless steel wire and peeled off, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as unqualified.
In coil turns to type, rule, electric product operating, all can there are pressure or frictional force to act on enamel-covered wire,
The scratch resistance performance of paint film is represented with scratch resistance number of times of the paint film under the effect of certain external force or scraping force.The baking degree shadow of enamel-covered wire
Rung the scratch resistance performance of paint film, in certain vehicle speed range, speed is slow, bakeed high, molecular force is just strong, paint film it is resistance to
Scrape performance all right.Certain baking degree is nor the higher the better, it is impossible to more than the colour code of customer.
Step 1) in, the external diameter of the stainless steel wire is 0.5~0.6mm, such as 0.5mm, 0.51mm, 0.52mm,
0.53mm、0.54mm、0.55mm、0.56mm、0.57mm、0.58mm、0.59mm、0.6mm；The insulating polyester imines enamelled coating
Thickness is 0.01~0.05mm, such as 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm.
Step 1) in, the process of the cleaning is：By the stainless steel wire be placed in 50~60 DEG C of pure water cleaning 2~
3 times.
Step 1) in, the linear velocity in the baking process is 40~70m/min, such as 40m/min, 50m/min, 60m/
min、70m/min。
Step 1) in, the temperature of the baker is specifically configured to：Inlet temperature is 200~300 DEG C, and outlet temperature is 300
~350 DEG C, import furnace temperature is too high or too low, can make not do in dry outside paint film, causing the scratch resistance of paint film reduces, it is preferable that institute
It is 250 DEG C to state inlet temperature, and the outlet temperature is 320 DEG C.
Step 1) in, the process of the japanning is that the polyester-imide paint is coated on into the stainless steel wire, coated repeatedly
5~10 times, coating carries out high temperature baking after terminating, and insulating polyester imines paint paint film is fully solidified, and prevents after coating every time
Paint film is layered, and forms relatively firmly more overall, prevents that paint film is scratched when scratch resistance performance from testing.
Step 1) in, the process of the drying is that the stainless steel wire after annealing is placed in into flash baking in drying baker
The moisture on surface.
As the present invention preferred scheme, detection method, it is characterised in that comprise the following steps：1) polyester-imide is not
The preparation of rust steel enamel-covered wire：Selection stainless steel wire is conductor core wire, in the pure water that the stainless steel wire is placed in 50~60 DEG C
Cleaning 2~3 times, annealing, the stainless steel wire after annealed processing is placed in the moisture on flash baking surface in drying baker, is placed in
The stainless steel wire is coated on by insulating polyester imines enamelled coating of polyester-imide paint in baker, the temperature of the baker is specifically set
For：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, through japanning, bakee after come out of the stove cooling, the process of the japanning is, by
The polyester-imide paint is coated on the stainless steel wire, coats 5~10 times repeatedly, often coats and once bakee afterwards once, described to dry
Linear velocity during roasting is 40~70m/min, and polyester-imide stainless steel enamel-covered wire is made；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into the attachment state of 5cm length, detection insulating polyester imines enamelled coating and stainless steel wire；
If resistance to scraping force is more than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 5cm length, insulating polyester is sub-
With stainless steel wire tubulose stripping does not occur for amine enamelled coating, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as qualified；
If resistance to scraping force is less than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 5cm length, insulating polyester is sub-
Amine enamelled coating occurs tubulose with stainless steel wire and peeled off, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as unqualified.
Compared with prior art, beneficial effects of the present invention are：The polyester-imide stainless steel enameled wire baking degree of the present invention
Detection method, the detection method is simple to operate, can quick and precisely measure the qualified of polyester-imide stainless steel enameled wire baking degree
Degree；Polyester-imide stainless steel enamel-covered wire is placed in unidirectional scrape and resistance to scraping force is tested in lacquer test instrument, by the polyester-imide stainless steel paint
Envelope curve is cut into the attachment state of 4~6cm length, detection insulating polyester imines enamelled coating and stainless steel wire；If resistance to scraping force is more than 10N,
And when the polyester-imide stainless steel enamel-covered wire is cut into 5cm length, insulating polyester imines enamelled coating and the non-generator tube of stainless steel wire
Shape is peeled off, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as qualified；If resistance to scraping force is less than 10N, and will be described poly-
When ester imines stainless steel enamel-covered wire is cut into 5cm length, insulating polyester imines enamelled coating occurs tubulose with stainless steel wire and peeled off, then described
The baking degree of polyester-imide stainless steel enamel-covered wire is considered as unqualified.
Embodiment
Technical scheme is further illustrated below by embodiment.
Unless specific instructions, various raw materials of the invention are commercially available buys, or is prepared according to the conventional method of this area
Obtain.
Embodiment 1
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is put
Cleaned 2~3 times in 50 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, come out of the stove after japanning, baking cooling, institute
The process for stating japanning is that the polyester-imide paint is coated on into the stainless steel wire, is coated 5~10 times repeatedly, described baked
Linear velocity in journey is 45m/min, and polyester-imide stainless steel enamel-covered wire is made；Wherein a diameter of 0.5mm of stainless steel wire, described
The thickness of insulating polyester imines enamelled coating is 0.02mm；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into 5cm length and 10 samples, detection insulating polyester imines enamelled coating and stainless steel is made
The attachment state of line.Measured through scratch resistance performance, the average resistance to scraping force of the polyester-imide stainless steel enamel-covered wire of the present embodiment is
12.32N, and with stainless steel wire tubulose stripping does not occur for the polyester-imide enamelled coating of 10 samples, therefore, the polyester of the present embodiment is sub-
The baking degree of amine stainless steel enamel-covered wire is qualified.
Embodiment 2
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is put
Cleaned 2~3 times in 50 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, come out of the stove after japanning, baking cooling, institute
The process for stating japanning is that the polyester-imide paint is coated on into the stainless steel wire, is coated 5~10 times repeatedly, described baked
Linear velocity in journey is 50m/min, and polyester-imide stainless steel enamel-covered wire is made；Wherein a diameter of 0.5mm of stainless steel wire, described
The thickness of insulating polyester imines enamelled coating is 0.02mm；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into 5cm length and 10 samples, detection insulating polyester imines enamelled coating and stainless steel is made
The attachment state of line.Measured through scratch resistance performance, the average resistance to scraping force of the polyester-imide stainless steel enamel-covered wire of the present embodiment is
11.56N, and with stainless steel wire tubulose stripping does not occur for the polyester-imide enamelled coating of 10 samples, therefore, the polyester of the present embodiment is sub-
The baking degree of amine stainless steel enamel-covered wire is qualified.
Embodiment 3
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is put
Cleaned 2~3 times in 50 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, come out of the stove after japanning, baking cooling, institute
The process for stating japanning is that the polyester-imide paint is coated on into the stainless steel wire, is coated 5~10 times repeatedly, described baked
Linear velocity in journey is 55m/min, and polyester-imide stainless steel enamel-covered wire is made；Wherein a diameter of 0.55mm of stainless steel wire, institute
The thickness for stating insulating polyester imines enamelled coating is 0.03mm；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into 5cm length and 10 samples, detection insulating polyester imines enamelled coating and stainless steel is made
The attachment state of line.Measured through scratch resistance performance, the average resistance to scraping force of the polyester-imide stainless steel enamel-covered wire of the present embodiment is
There are 3 polyester-imide enamelled coatings to occur tubulose with stainless steel wire in 8.62N, 10 samples to peel off, therefore, the polyester of the present embodiment is sub-
The baking degree of amine stainless steel enamel-covered wire is unqualified.
Embodiment 4
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is put
Cleaned 2~3 times in 50 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, come out of the stove after japanning, baking cooling, institute
The process for stating japanning is that the polyester-imide paint is coated on into the stainless steel wire, is coated 5~10 times repeatedly, described baked
Linear velocity in journey is 60m/min, and polyester-imide stainless steel enamel-covered wire is made；Wherein a diameter of 0.5mm of stainless steel wire, described
The thickness of insulating polyester imines enamelled coating is 0.04mm；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into 5cm length and 10 samples, detection insulating polyester imines enamelled coating and stainless steel is made
The attachment state of line.Measured through scratch resistance performance, the average resistance to scraping force of the polyester-imide stainless steel enamel-covered wire of the present embodiment is
There are 6 polyester-imide enamelled coatings to occur tubulose with stainless steel wire in 7.34N, 10 samples to peel off, therefore, the polyester of the present embodiment is sub-
The baking degree of amine stainless steel enamel-covered wire is unqualified.
Embodiment 5
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is put
Cleaned 2~3 times in 50 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and outlet temperature is 320 DEG C, come out of the stove after japanning, baking cooling, institute
The process for stating japanning is that the polyester-imide paint is coated on into the stainless steel wire, is coated 5~10 times repeatedly, described baked
Linear velocity in journey is 70m/min, and polyester-imide stainless steel enamel-covered wire is made；Wherein a diameter of 0.56mm of stainless steel wire, institute
The thickness for stating insulating polyester imines enamelled coating is 0.05mm；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will
The polyester-imide stainless steel enamel-covered wire is cut into 5cm length and 10 samples, detection insulating polyester imines enamelled coating and stainless steel is made
The attachment state of line.Measured through scratch resistance performance, the average resistance to scraping force of the polyester-imide stainless steel enamel-covered wire of the present embodiment is
There are 8 polyester-imide enamelled coatings to occur tubulose with stainless steel wire in 6.84N, 10 samples to peel off, therefore, the polyester of the present embodiment is sub-
The baking degree of amine stainless steel enamel-covered wire is unqualified.
From the foregoing, it will be observed that the baking degree of polyester-imide stainless steel enamel-covered wire made from embodiment 3, embodiment 4, embodiment 5 is not
It is qualified；And the present invention control toaster entrance temperature be 250 DEG C, outlet temperature be 320 DEG C under conditions of, adjust baking process in
Linear velocity be 45~55m/min when, the qualified degree of polyester-imide stainless steel enameled wire baking degree can be improved.The polyester of the present invention
The detection method of imines stainless steel enameled wire baking degree, it is simple to operate, it can quick and precisely measure polyester-imide stainless steel enamel-covered wire
The qualified degree of baking degree.
Applicant states that the present invention illustrates detailed process equipment and the technological process of the present invention by above-described embodiment,
But the invention is not limited in above-mentioned detailed process equipment and technological process, that is, do not mean that the present invention has to rely on above-mentioned detailed
Process equipment and technological process could be implemented.Person of ordinary skill in the field it will be clearly understood that any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within the present invention's
Within the scope of protection domain and disclosure.
Claims (9)
1. a kind of detection method of polyester-imide stainless steel enameled wire baking degree, it is characterised in that comprise the following steps：
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, cleaned, annealing, drying process,
It is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, is come out of the stove after japanning, baking
Cooling, is made polyester-imide stainless steel enamel-covered wire；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will be described
Polyester-imide stainless steel enamel-covered wire is cut into the attachment state of 4~6cm length, detection insulating polyester imines enamelled coating and stainless steel wire；
If resistance to scraping force is more than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 4~6cm length, insulating polyester imines
With stainless steel wire tubulose stripping does not occur for enamelled coating, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as qualified；
If resistance to scraping force is less than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 4~6cm length, insulating polyester imines
Enamelled coating occurs tubulose with stainless steel wire and peeled off, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as unqualified.
2. detection method according to claim 1, it is characterised in that step 1) in, the external diameter of the stainless steel wire is 0.5
~0.6mm, the thickness of the insulating polyester imines enamelled coating is 0.01~0.05mm.
3. detection method according to claim 1 or 2, it is characterised in that step 1) in, the process of the cleaning is：Will
The stainless steel wire is placed in 50~60 DEG C of pure water and cleaned 2~3 times.
4. the detection method according to one of claim 1-3, it is characterised in that step 1) in, in the baking process
Linear velocity is 40~70m/min.
5. the detection method according to one of claim 1-4, it is characterised in that step 1) in, the temperature tool of the baker
Body is set to：Inlet temperature is 200~300 DEG C, and outlet temperature is 300~350 DEG C.
6. detection method according to claim 5, it is characterised in that the inlet temperature is 250 DEG C, the outlet temperature
For 320 DEG C.
7. the detection method according to one of claim 1-6, it is characterised in that step 1) in, the process of the japanning is,
The polyester-imide paint is coated on the stainless steel wire, coated 5~10 times repeatedly.
8. the detection method according to one of claim 1-7, it is characterised in that step 1) in, the process of the drying is,
Stainless steel wire after annealing is placed in the moisture on flash baking surface in drying baker.
9. the detection method according to one of claim 1-8, it is characterised in that comprise the following steps：
1) preparation of polyester-imide stainless steel enamel-covered wire：Selection stainless steel wire is conductor core wire, and the stainless steel wire is placed in into 50
Cleaned 2~3 times in~60 DEG C of pure water, annealing, the stainless steel wire after annealed processing, which is placed in drying baker, quickly to be dried
The moisture on dry surface, is placed in baker by insulating polyester imines enamelled coating of polyester-imide paint and is coated on the stainless steel wire, described
The temperature of baker is specifically configured to：Inlet temperature is 250 DEG C, and middle outlet temperature is 320 DEG C, cooling of being come out of the stove after japanning, baking,
The process of the japanning is that the polyester-imide paint is coated on into the stainless steel wire, coats 5~10 times repeatedly, often coats one
Bakeed once after secondary, the linear velocity in the baking process is 40~70m/min, and polyester-imide stainless steel enamel-covered wire is made；
2) by step 1) made from polyester-imide stainless steel enamel-covered wire be placed in unidirectional scrape resistance to scraping force tested in lacquer test instrument, will be described
Polyester-imide stainless steel enamel-covered wire is cut into the attachment state of 5cm length, detection insulating polyester imines enamelled coating and stainless steel wire；
If resistance to scraping force is more than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 5cm length, insulating polyester imines paint
With stainless steel wire tubulose stripping does not occur for layer, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as qualified；
If resistance to scraping force is less than 10N, and when the polyester-imide stainless steel enamel-covered wire is cut into 5cm length, insulating polyester imines paint
Layer occurs tubulose with stainless steel wire and peeled off, then the baking degree of the polyester-imide stainless steel enamel-covered wire is considered as unqualified.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110867271A (en) * | 2019-10-25 | 2020-03-06 | 湖州华上电工科技股份有限公司 | Modified polyesterimide enameled wire and preparation method thereof |
| CN114628090A (en) * | 2022-03-17 | 2022-06-14 | 苏州东特绝缘科技有限公司 | Production process of colored polyester imide enameled wire for voice coil |
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