CN101017136A - Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber - Google Patents
Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber Download PDFInfo
- Publication number
- CN101017136A CN101017136A CN 200710003247 CN200710003247A CN101017136A CN 101017136 A CN101017136 A CN 101017136A CN 200710003247 CN200710003247 CN 200710003247 CN 200710003247 A CN200710003247 A CN 200710003247A CN 101017136 A CN101017136 A CN 101017136A
- Authority
- CN
- China
- Prior art keywords
- concentration
- straight
- oil
- line equation
- pol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
This invention belongs to measurement technique and relates to one carbon fiber polyacryl-nitrile protofilament process oil agent concentration online test method, which is characterized by the following: it uses series oil agent work pool to feed materials tube or to exit pipe online reflection index meter for online test and comprises the steps as: getting oil agent concentration and reflection index or sugar degree standard curve; optimizing line equation; online testing.
Description
Technical field
The invention belongs to measuring technique, relate to the online test method of oil concentration in a kind of polyacrylonitrile fibril for carbon fiber production run.
Background technology
PAN-based carbon fiber has characteristics such as high specific strength, high ratio modulus, high temperature resistant, corrosion-resistant, creep resistant, stability are strong, and at Aero-Space, mechano-electronic, chemical building material, every field such as energy traffic all have boundless application.PAN-based carbon fiber is produced and is comprised polyacrylonitrile fibril production and two big links of precursor carbonization, and wherein precursor production is key link, and the quality of precursor and quality stability have decisive influence to the quality and the quality stability of final carbon fiber product.Polyacrylonitrile fibril production comprises polymerization, deaeration, takes off list, spinning, wash, oil, multiple tracks technology such as drawing-off.Oiling process is the important ring during polyacrylonitrile fibril is produced, and no matter is wet spinning or dry-jet wet-spinning, and the operation that oils all directly influences the quality of PAN precursor, also final carbon fiber character is had significant impact.It is not good enough not oil or oil, and can cause sticking chain between the monofilament, causes the decline of carbon fiber pulling strengrth [Zhang Yinzhi, He Fu, Wang Maozhang, PAN high-performance carbon fibre precursor general situation of development.Synthetic fiber industry, 1993,16 (2): 54～57].Good heat resistance, good, the wear-resisting wiping of spreadability, 200 ℃ of left and right sides resistances to oxidation, the volatile product of high temperature are adopted in the selection of oil agent kind usually.Finish at the adhesion amount on the former silk fiber usually between 0.2～2.0% (massfraction), more or less according to finish kind and experimental result and decide.The finish quantity not sufficient can not form the oil film of lubricate at fiber surface, can the damage monofilament surface in the subsequent technique; The finish amount is too much, is difficult for volatilization in the carbonization process fully, influences the pulling strengrth and the breaking elongation of carbon fiber.Therefore the concentration of controlling finish in the finish work pool guarantees that the finish adhesion amount on the polyacrylonitrile fibril becomes the key link of oiling process in the polyacrylonitrile fibril production run near the optimum value that oiling process is determined in stable scope.The concentration of controlling finish in the finish work pool must accurately be measured the concentration of finish in the finish work pool in stable scope.Traditional chemical method is determined oil content in the finish work pool, a plurality of steps such as generally include sampling, volatilization, evaporate to dryness, weigh, and length consuming time, measuring error is big, is unfavorable for the process control of oil concentration in the polyacrylonitrile fibril production run.And traditional chemical method can not be carried out online detection, can't control automatically.
Summary of the invention
The objective of the invention is to: a kind of online test method that fast, accurately detects oil concentration in the polyacrylonitrile fibril for carbon fiber production run is provided.To overcome loaded down with trivial details, time-consuming, the inefficient shortcoming of traditional chemical method, improve the dynamic and the accuracy of oil concentration control in the polyacrylonitrile fibril production run, for robotization control lays the foundation.
Technical scheme of the present invention is: the online test method of oil concentration during a kind of polyacrylonitrile fibril for carbon fiber is produced, it is characterized in that, 2 pairs of oil concentrations of online refractive index equipment that use is connected on finish work pool feed pipe or the discharge nozzle 1 carry out online detection, and it is as follows that it detects step:
1, obtains the typical curve of oil concentration and refraction index or pol;
1.1, the agent concentration titer makes up oil; Adopt the finish titer of raw material preparation variable concentrations identical in the polyacrylonitrile fibril for carbon fiber production; If the round values of measured oil agent concentration value is α %, the quantity of the concentration standard liquid of then being prepared is at least 5, one of them is α %, the numerical value of all the other half concentration standard liquid is less than α %, the numerical value of the concentration standard liquid of half is greater than α % in addition, and the spacing of two adjacent concentration of standard solution numerical value is 0.1* α %～0.5* α %; The value Y of the agent concentration titer that makes up oil
0Expression;
1.2, the refraction index or the pol value Y of bioassay standard liquid
0Use handheld refractometer or Abbe refractometer or digital refractometer to measure the refraction index or the pol value Y of oil concentration titer
0To measure numerical value input computing machine;
1.3, match oil concentration X
0With refraction index or pol Y
0The standard straight-line equation; Adopt least square method to carry out linear fit by interpolation, obtain straight-line equation, standard deviation S D and the degree of correlation RD of oil concentration and refraction index or pol, the standard straight-line equation is:
Y＝aX+b (1)
In the formula, Y is refraction index or pol, and X is an oil concentration;
2, optimize straight-line equation; At first, the standard deviation S D and the degree of correlation RD of checking straight-line equation; The refraction index of the titer that step 1.1.2 is measured or pol be substitution formula (1) respectively, calculates the calculated value X under this oil concentration, according to X
0And X, calculate standard deviation S D and degree of correlation RD, if standard deviation S D is not more than 1, degree of correlation RD is greater than 0.9 simultaneously, this straight-line equation can directly use; Otherwise repeating step 1.1 increases the quantity of concentration standard liquid, obtain straight-line equation again after, carry out straight-line equation optimization according to this step again, till satisfying above-mentioned requirements; Deposit the optimization straight-line equation that obtains in computing machine; And will optimize straight-line equation and deposit in the computing unit in the online refractive index equipment 2;
3, online detection; Finish in online refractive index equipment 2 pairs of finish work pools feed pipe or the discharge nozzle 1 carries out continuous on-line detection, directly the concentration value of outputting material.
Advantage of the present invention is: the online concentration of determining fast in the finish of the present invention's energy helps improving promptness, dynamic and the control accuracy of oil concentration control.Method of testing of the present invention fast, accurately, intuitively is fit to carry out automated production.
Description of drawings
Fig. 1 is the scheme of installation of online refractive index equipment 2 among the present invention.
Embodiment
Below the present invention is described in further details.Referring to Fig. 1, online test method of the present invention is characterized in that, uses the 2 pairs of oil concentrations of online refractive index equipment that are connected on finish work pool feed pipe or the discharge nozzle 1 to carry out online detection, and it is as follows that it detects step:
1, obtains the typical curve of oil concentration and refraction index or pol;
1.1, the agent concentration titer makes up oil; Adopt the finish titer of raw material preparation variable concentrations identical in the polyacrylonitrile fibril for carbon fiber production; If the round values of measured oil agent concentration value is α %, the quantity of the concentration standard liquid of then being prepared is at least 5, one of them is α %, the numerical value of all the other half concentration standard liquid is less than α %, the numerical value of the concentration standard liquid of half is worked energetically α % in addition, and the spacing of two adjacent concentration of standard solution numerical value is 0.1* α %～0.5* α %; The value X of the agent concentration titer that makes up oil
0Expression;
1.2, the refraction index or the pol value Y of bioassay standard liquid
0Use handheld refractometer or Abbe refractometer or digital refractometer to measure the refraction index or the pol value Y of oil concentration titer
0To measure numerical value input computing machine;
1.3, match oil concentration X
0With refraction index or pol Y
0The standard straight-line equation; Adopt least square method to carry out linear fit by interpolation, obtain standard straight-line equation, standard deviation S D and the degree of correlation RD of oil concentration and refraction index or pol, straight-line equation is:
Y＝aX+b (1)
In the formula, Y is a refraction index, and X is an oil concentration;
2, optimize straight-line equation; At first, the standard deviation S D and the degree of correlation RD of checking straight-line equation; The refraction index of the titer that step 1.1.2 is measured or pol be substitution formula (1) respectively, calculates the calculated value X under this oil concentration, according to X
0And X, calculate standard deviation S D and degree of correlation RD, if standard deviation S D is not more than 1, degree of correlation RD is greater than 0.9 simultaneously, this straight-line equation can directly use; Otherwise repeating step 1.1 increases the quantity of concentration standard liquid, obtain straight-line equation again after, carry out straight-line equation optimization according to this step again, till satisfying above-mentioned requirements; Deposit the optimization straight-line equation that obtains in computing machine; And will optimize straight-line equation and deposit in the computing unit in the online refractive index equipment 2;
3, online detection; Finish in online refractive index equipment 2 pairs of finish work pools feed pipe or the discharge nozzle 1 carries out continuous on-line detection, by the standard straight-line equation of oil concentration and refraction index or pol, the directly concentration value of outputting material.
Employed online refractive index equipment 2 is commercially available finished product, for example, can use and like to open up the PRM-85 model of board or the online refractive index equipment of CM780 model.If the online refractive index equipment 2 of series connection is had any problem on finish work pool feed pipe or discharge nozzle 1, also online refractive index equipment 2 can be connected on the bypass conduit of finish work pool feed pipe or discharge nozzle 1.
Employed handheld refractometer or Abbe refractometer or digital refractometer and online refractive index equipment 2 are commercially available finished product.For example can use and like to open up the desk-top refractive index equipment of board R5000 numeral.
Embodiment.
Example 1, the online detection of the oil concentration of certain trade mark
1, obtains the typical curve of oil concentration and refraction index;
1.1, the agent concentration titer makes up oil; If the round values of measured oil agent concentration value is α %; The quantity of the concentration standard liquid of then being prepared is at least 5, and one of them is α %, and the numerical value of all the other half concentration standard liquid is less than α %; The numerical value of the concentration standard liquid of half is greater than α % in addition, and the spacing of two adjacent concentration of standard solution numerical value is 0.1* α %～0.5* α %; Select 12 points in this example for use, particular content sees Table 1.
The concentration of table 1 oil concentration titer
| Sample number into spectrum | Concentration (%) |
| 1 | 2.49966 |
| 2 | 2.993 |
| 3 | 4.0103 |
| 4 | 4.99224 |
| 5 | 6.0027 |
| 6 | 6.9944 |
| 7 | 7.8999 |
| 8 | 8.9968 |
| 9 | 9.98818 |
| 10 | 12.0063 |
| 11 | 13.9793 |
| 12 | 16.0032 |
1.2, the refraction index of bioassay standard liquid; Use digital refractometer to measure the refraction index and the pol value of oil concentration titer; To measure numerical value input computing machine.Measurement result sees Table 2.
The refraction index of table 2 titer
| Sample number into spectrum | Concentration (%) | Refraction index | The pol value |
| 1 | 2.49966 | 1.33423 | 1.6 |
| 2 | 2.993 | 1.33459 | 1.86 |
| 3 | 4.0103 | 1.33555 | 2.52 |
| 4 | 4.99224 | 1.33669 | 3.31 |
| 5 | 6.0027 | 1.33735 | 3.76 |
| 6 | 6.9944 | 1.33823 | 4.37 |
| 7 | 7.8999 | 1.33907 | 4.94 |
| 8 | 8.9968 | 1.34008 | 5.62 |
| 9 | 9.98818 | 1.34126 | 6.42 |
| 10 | 12.0063 | 1.34274 | 7.41 |
| 11 | 13.9793 | 1.34444 | 8.54 |
| 12 | 16.0032 | 1.34647 | 9.88 |
1.3, the standard straight-line equation of match oil concentration and refraction index; Adopt least square method to carry out linear fit by interpolation, the standard straight-line equation that obtains refraction index and oil concentration is:
y＝9.01923E-4x+1.33198 [1]
Y is a refraction index in the formula, and x is an oil concentration.
The standard straight-line equation of match oil concentration and pol value; The standard straight-line equation that obtains pol value and refraction index is:
y＝0.61056x+0.11607 [2]
Y is the pol value in the formula, and x is an oil concentration.
2, optimize straight-line equation; At first, the standard deviation S D and the degree of correlation RD of checking straight-line equation; The refraction index of the titer that step 1.1.2 is measured is substitution formula [1] respectively, calculates the calculated value X under this oil concentration, according to X
0And X, through calculating, the character of straight-line equation [1] y=9.01923E-4x+1.33198 is as follows: degree of correlation RD=0.99, standard deviation S D=1.28E-4 meets accuracy requirement, can directly use.
3, online detection; Finish in online refractive index equipment 2 pairs of finish work pools feed pipe or the discharge nozzle 1 carries out continuous on-line detection, by the standard straight-line equation of oil concentration and refraction index or pol, can directly export concentration numerical value.Measurement result instant playback, this method are fast, efficiently.Following table 3 is gathering of one group of online detection data of different time.
Table 3, measurement result
| Time | Concentration (%) | Refraction index | The pol value |
| The moment 1 | 1.14931 | 1.33302 | 0.81779 |
| The moment 2 | 2.00216 | 1.33379 | 1.33851 |
| The moment 3 | 2.85502 | 1.33456 | 1.85923 |
| The moment 4 | 3.70787 | 1.33533 | 2.37995 |
| The moment 5 | 4.56073 | 1.3361 | 2.90067 |
| The moment 6 | 5.41358 | 1.33686 | 3.42138 |
| The moment 7 | 6.26644 | 1.33763 | 3.9421 |
| The moment 8 | 7.11929 | 1.3384 | 4.46282 |
| The moment 9 | 7.97215 | 1.33917 | 4.98354 |
| The moment 10 | 8.825 | 1.33994 | 5.50426 |
| The moment 11 | 9.67786 | 1.34071 | 6.02498 |
| The moment 12 | 10.53071 | 1.34148 | 6.5457 |
| The moment 13 | 11.38357 | 1.34225 | 7.06641 |
| The moment 14 | 12.23642 | 1.34302 | 7.58713 |
| The moment 15 | 13.08928 | 1.34379 | 8.10785 |
| The moment 16 | 13.94213 | 1.34456 | 8.62857 |
| The moment 17 | 14.79499 | 1.34533 | 9.14929 |
| The moment 18 | 15.64784 | 1.3461 | 9.67001 |
| The moment 19 | 16.5007 | 1.34686 | 10.19072 |
| The moment 20 | 17.35355 | 1.34763 | 10.71144 |
Example 2, the online detection of the oil concentration of certain trade mark
1, obtains the typical curve of oil concentration and refraction index;
1.1, the agent concentration titer makes up oil; If the round values of measured oil agent concentration value is α %, the quantity of the concentration standard liquid of then being prepared is at least 5, one of them is α %, the numerical value of all the other half concentration standard liquid is less than α %, the numerical value of the concentration standard liquid of half is greater than α % in addition, and the spacing of two adjacent concentration of standard solution numerical value is 0.1* α %～0.5* α %; Select 10 points in this example for use, particular content sees Table 4.
The concentration of table 4 oil concentration titer
| Sample number into spectrum | Concentration (%) |
| 1 | 9.97392 |
| 2 | 11.988 |
| 3 | 14.0004 |
| 4 | 15.9785 |
| 5 | 18.001 |
| 6 | 19.9977 |
| 7 | 22.0533 |
| 8 | 24.0087 |
| 9 | 25.9702 |
| 10 | 27.9663 |
1.2, the refraction index of bioassay standard liquid; Use digital refractometer to measure the refraction index and the pol value of oil concentration titer; To measure numerical value input computing machine.Measurement result sees Table 5.
The refraction index of table 5 titer
| Sample number into spectrum | Concentration (%) | Refraction index | The pol value |
| 1 | 9.97392 | 1.34095 | 6.21 |
| 2 | 11.988 | 1.34275 | 7.42 |
| 3 | 14.0004 | 1.34452 | 8.59 |
| 4 | 15.9785 | 1.34642 | 9.85 |
| 5 | 18.001 | 1.34818 | 10.99 |
| 6 | 19.9977 | 1.35022 | 12.24 |
| 7 | 22.0533 | 1.35185 | 13.36 |
| 8 | 24.0087 | 1.35357 | 14.45 |
| 9 | 25.9702 | 1.35534 | 15.56 |
| 10 | 27.9663 | 1.35723 | 16.74 |
1.3, the standard straight-line equation of match oil concentration and refraction index; Adopt least square method to carry out linear fit by interpolation, the standard straight-line equation that obtains refraction index and oil concentration is:
y＝9.03533E-4x+1.33194 [1]
Y is a refraction index in the formula, and x is an oil concentration.
The standard straight-line equation of match oil concentration and pol value; The standard straight-line equation that obtains pol value and refraction index is:
y＝0.58423x+0.44435 [2]
Y is the pol value in the formula, and x is an oil concentration.
2, optimize straight-line equation; At first, the standard deviation S D and the degree of correlation RD of checking straight-line equation; The refraction index of the titer that step 1.1.2 is measured is substitution formula [1] respectively, calculates the calculated value X under this oil concentration, according to X
0And X, through calculating, the character of straight-line equation [1] y=9.03533E-4x+1.33194 is as follows: degree of correlation RD=0.999, standard deviation S D=8.7E-5 meets accuracy requirement, can directly use.
3, online detection; Finish in online refractive index equipment 2 pairs of finish work pools feed pipe or the discharge nozzle 1 carries out continuous on-line detection, by the standard straight-line equation of oil concentration and refraction index or pol, can directly export concentration numerical value.Measurement result instant playback, this method are fast, efficiently.Following table 6 is gathering of one group of online detection data of different time.
Table 6 measurement result for example
| Time | Concentration (%) | The pol value | Refraction index |
| The moment 1 | 8.17468 | 5.2202 | 1.33933 |
| The moment 2 | 9.31104 | 5.88409 | 1.34035 |
| The moment 3 | 10.4474 | 6.54798 | 1.34138 |
| The moment 4 | 11.58376 | 7.21187 | 1.34241 |
| The moment 5 | 12.72013 | 7.87576 | 1.34343 |
| The moment 6 | 13.85649 | 8.53965 | 1.34446 |
| The moment 7 | 14.99285 | 9.20354 | 1.34549 |
| The moment 8 | 16.12921 | 9.86743 | 1.34651 |
| The moment 9 | 17.26557 | 10.53132 | 1.34754 |
| The moment 10 | 18.40193 | 11.19521 | 1.34857 |
| The moment 11 | 19.53829 | 11.8591 | 1.34959 |
| The moment 12 | 20.67465 | 12.523 | 1.35062 |
| The moment 13 | 21.81101 | 13.18689 | 1.35165 |
| The moment 14 | 22.94737 | 13.85078 | 1.35268 |
| The moment 15 | 24.08373 | 14.51467 | 1.3537 |
| The moment 16 | 25.22009 | 15.17856 | 1.35473 |
| The moment 17 | 26.35646 | 15.84245 | 1.35576 |
| The moment 18 | 27.49282 | 16.50634 | 1.35678 |
| The moment 19 | 28.62918 | 17.17023 | 1.35781 |
| The moment 20 | 29.76554 | 17.83412 | 1.35884 |
Claims (1)
1, the online test method of oil concentration during a kind of polyacrylonitrile fibril for carbon fiber is produced, it is characterized in that, the online refractive index equipment [2] that use is connected on finish work pool feed pipe or the discharge nozzle [1] is carried out online detection to oil concentration, and it is as follows that it detects step:
1.1, obtain the typical curve of oil concentration and refraction index or pol;
1.1.1, the agent concentration titer makes up oil; Adopt the finish titer of raw material preparation variable concentrations identical in the polyacrylonitrile fibril for carbon fiber production; If the round values of measured oil agent concentration value is α %, the quantity of the concentration standard liquid of then being prepared is at least 5, one of them is α %, the numerical value of all the other half concentration standard liquid is less than α %, the numerical value of the concentration standard liquid of half is greater than α % in addition, and the spacing of two adjacent concentration of standard solution numerical value is 0.1* α %～0.5* α %; The value X of the agent concentration titer that makes up oil
0Expression;
1.1.2, the refraction index or the pol value Y of bioassay standard liquid
0Use handheld refractometer or Abbe refractometer or digital refractometer to measure the refraction index or the pol value Y of oil concentration titer
0To measure numerical value input computing machine;
1.1.3, match oil concentration X
0With refraction index or pol Y
0The standard straight-line equation; Adopt least square method to carry out linear fit by interpolation, obtain standard straight-line equation, standard deviation S D and the degree of correlation RD of oil concentration and refraction index or pol, straight-line equation is:
Y＝aX+b (1)
In the formula, Y be refraction index or pol with, X is an oil concentration;
1.2, optimize straight-line equation; At first, the standard deviation S D and the degree of correlation RD of checking straight-line equation; The refraction index of the titer that step 1.1.2 is measured or pol be substitution formula (1) respectively, calculate the calculated value X under this oil concentration, according to X0 and X, calculate standard deviation S D and degree of correlation RD, if standard deviation S D is not more than 1, degree of correlation RD is greater than 0.9 simultaneously, and this straight-line equation can directly use; Otherwise repeating step 1.1 increases the quantity of concentration standard liquid, obtain straight-line equation again after, carry out straight-line equation optimization according to this step again, till satisfying above-mentioned requirements; Deposit the optimization straight-line equation that obtains in computing machine; And will optimize straight-line equation and deposit in the computing unit in the online refractive index equipment [2];
1.3, online detection; Online refractive index equipment [2] is carried out continuous on-line detection to the finish in finish work pool feed pipe or the discharge nozzle [1], directly the concentration value of outputting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710003247A CN101017136B (en) | 2007-02-02 | 2007-02-02 | Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710003247A CN101017136B (en) | 2007-02-02 | 2007-02-02 | Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101017136A true CN101017136A (en) | 2007-08-15 |
| CN101017136B CN101017136B (en) | 2010-05-19 |
Family
ID=38726284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710003247A Active CN101017136B (en) | 2007-02-02 | 2007-02-02 | Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101017136B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871887A (en) * | 2010-06-28 | 2010-10-27 | 中国科学院西安光学精密机械研究所 | Method for on-line detection of coagulation bath concentration in production of polyacrylonitrile protofilament for carbon fiber |
| CN107703099A (en) * | 2016-08-08 | 2018-02-16 | 中国石油化工股份有限公司 | On-line continuous detection device and method and polymerization reaction system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167838C (en) * | 2002-12-16 | 2004-09-22 | 中国科学院山西煤炭化学研究所 | Prepn of polyacrylonitrile-base high-performance raw carbon fiber |
-
2007
- 2007-02-02 CN CN200710003247A patent/CN101017136B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871887A (en) * | 2010-06-28 | 2010-10-27 | 中国科学院西安光学精密机械研究所 | Method for on-line detection of coagulation bath concentration in production of polyacrylonitrile protofilament for carbon fiber |
| CN107703099A (en) * | 2016-08-08 | 2018-02-16 | 中国石油化工股份有限公司 | On-line continuous detection device and method and polymerization reaction system and method |
| CN107703099B (en) * | 2016-08-08 | 2021-03-16 | 中国石油化工股份有限公司 | On-line continuous detection method and polymerization reaction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101017136B (en) | 2010-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100458415C (en) | Method for detecting concentration of oil solution in producing polyacrylonitrile raw yarn in use for carbon fiber | |
| Saxena et al. | Computer-controlled decreasing stress intensity technique for low rate fatigue crack growth testing | |
| CN101871887A (en) | Method for on-line detection of coagulation bath concentration in production of polyacrylonitrile protofilament for carbon fiber | |
| CN101017136B (en) | Online testing method for oil solution concentration of polyacrylonitile production used in carbon fiber | |
| CN110989510A (en) | Hot galvanizing product full-process quality control and grade automatic judgment system | |
| CN104975388B (en) | A kind of weak ring detection of yarn strength and the method and its device removed | |
| CN106794612A (en) | Predict the method and toggle joint type device for clamping mould in the life-span of the mold cramping ball screw framework of toggle joint type device for clamping mould | |
| CN118320702A (en) | Mixing quality control method and system for water-based paint auxiliary agent | |
| CN101967689B (en) | Method and device for controlling multi-level coagulation bath concentration for spinning polyacrylonitrile protofilament | |
| CN103353509A (en) | Tobacco leaf slitting judgment method based on principal component analysis and optimal segmentation method | |
| CN101013089A (en) | On-line detecting method of stiffening agent concentration during carbon fibre production process | |
| CN113933433B (en) | Verification method for filter rod plasticizer application system | |
| CN110967292A (en) | Method for detecting sulfide form in sulfur-containing medium-carbon steel large bar | |
| CN111693216A (en) | Cable water inflow detection method based on thermal parameter time change of filling layer material | |
| CN110163480A (en) | Quality auxiliary decision method for wrapping workshop | |
| CN101105559A (en) | Optical fiber secondary plastic coating residual length tester | |
| CN102141369A (en) | Resistance-type concrete abrasion sensor and measurement method thereof | |
| CN101008613A (en) | Quick detection method of sizing agents concentration in carbon fibers production process | |
| CN106887005B (en) | A kind of blank pipe composite filter segment length's measurement method of view-based access control model detection | |
| CN105181526A (en) | Viscosity detection method in sizing agent production process | |
| ITMI20011245A1 (en) | DEVICE OF AN ADJUSTING IRON TO DETECT DIRECTLY RECORDING POINTS OF THE ADJUSTMENT START POINT | |
| CN112432922A (en) | Method for rapidly detecting concentration of oil agent in production of polyacrylonitrile carbon fiber precursor | |
| CN201974155U (en) | Resistor-type concrete abrasion sensor | |
| CN1080332C (en) | Inflow sensor for drawing equipment | |
| CN102520199B (en) | On-line detection method of dye liquor components of bundle dyeing machine based on boards |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |